Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev: (258 commits)
[libata] conversion to new debug scheme, part 1 of $N
[PATCH] libata: Add ata_scsi_dev_disabled
[libata] Add host lock to struct ata_port
[PATCH] libata: implement per-dev EH action mask eh_info->dev_action[]
[PATCH] libata-dev: move the CDB-intr DMA blacklisting
[PATCH] ahci: disable NCQ support on vt8251
[libata] ahci: add JMicron PCI IDs
[libata] sata_nv: add PCI IDs
[libata] ahci: Add NVIDIA PCI IDs.
[PATCH] libata: convert several bmdma-style controllers to new EH, take #3
[PATCH] sata_via: convert to new EH, take #3
[libata] sata_nv: s/spin_lock_irqsave/spin_lock/ in irq handler
[PATCH] sata_nv: add hotplug support
[PATCH] sata_nv: convert to new EH
[PATCH] sata_nv: better irq handlers
[PATCH] sata_nv: simplify constants
[PATCH] sata_nv: kill struct nv_host_desc and nv_host
[PATCH] sata_nv: kill not-working hotplug code
[libata] Update docs to reflect current driver API
[PATCH] libata: add host_set->next for legacy two host_sets case, take #3
...

Documentation/DocBook/libata.tmpl

···
 
 	</sect2>
 
+	<sect2><title>PIO data read/write</title>
+	<programlisting>
+void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
+	</programlisting>
+
+	<para>
+All bmdma-style drivers must implement this hook.  This is the low-level
+operation that actually copies the data bytes during a PIO data
+transfer.
+Typically the driver
+will choose one of ata_pio_data_xfer_noirq(), ata_pio_data_xfer(), or
+ata_mmio_data_xfer().
+	</para>
+
+	</sect2>
+
 	<sect2><title>ATA command execute</title>
 	<programlisting>
 void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
···
 	<programlisting>
 u8   (*check_status)(struct ata_port *ap);
 u8   (*check_altstatus)(struct ata_port *ap);
-u8   (*check_err)(struct ata_port *ap);
 	</programlisting>
 
 	<para>
-	Reads the Status/AltStatus/Error ATA shadow register from
+	Reads the Status/AltStatus ATA shadow register from
 	hardware.  On some hardware, reading the Status register has
 	the side effect of clearing the interrupt condition.
 	Most drivers for taskfile-based hardware use
···
 	mode_filter hook instead.
 	</para>
 	</warning>
-
-	</sect2>
-
-	<sect2><title>Reset ATA bus</title>
-	<programlisting>
-void (*phy_reset) (struct ata_port *ap);
-	</programlisting>
-
-	<para>
-	The very first step in the probe phase.  Actions vary depending
-	on the bus type, typically.  After waking up the device and probing
-	for device presence (PATA and SATA), typically a soft reset
-	(SRST) will be performed.  Drivers typically use the helper
-	functions ata_bus_reset() or sata_phy_reset() for this hook.
-	Many SATA drivers use sata_phy_reset() or call it from within
-	their own phy_reset() functions.
-	</para>
 
 	</sect2>
 
···
 
 	</sect2>
 
-	<sect2><title>Timeout (error) handling</title>
+	<sect2><title>Exception and probe handling (EH)</title>
 	<programlisting>
 void (*eng_timeout) (struct ata_port *ap);
+void (*phy_reset) (struct ata_port *ap);
 	</programlisting>
 
 	<para>
-This is a high level error handling function, called from the
-error handling thread, when a command times out.  Most newer
-hardware will implement its own error handling code here.  IDE BMDMA
-drivers may use the helper function ata_eng_timeout().
+Deprecated.  Use ->error_handler() instead.
+	</para>
+
+	<programlisting>
+void (*freeze) (struct ata_port *ap);
+void (*thaw) (struct ata_port *ap);
+	</programlisting>
+
+	<para>
+ata_port_freeze() is called when HSM violations or some other
+condition disrupts normal operation of the port.  A frozen port
+is not allowed to perform any operation until the port is
+thawed, which usually follows a successful reset.
+	</para>
+
+	<para>
+The optional ->freeze() callback can be used for freezing the port
+hardware-wise (e.g. mask interrupt and stop DMA engine).  If a
+port cannot be frozen hardware-wise, the interrupt handler
+must ack and clear interrupts unconditionally while the port
+is frozen.
+	</para>
+	<para>
+The optional ->thaw() callback is called to perform the opposite of ->freeze():
+prepare the port for normal operation once again.  Unmask interrupts,
+start DMA engine, etc.
+	</para>
+
+	<programlisting>
+void (*error_handler) (struct ata_port *ap);
+	</programlisting>
+
+	<para>
+->error_handler() is a driver's hook into probe, hotplug, and recovery
+and other exceptional conditions.  The primary responsibility of an
+implementation is to call ata_do_eh() or ata_bmdma_drive_eh() with a set
+of EH hooks as arguments:
+	</para>
+
+	<para>
+'prereset' hook (may be NULL) is called during an EH reset, before any other actions
+are taken.
+	</para>
+
+	<para>
+'postreset' hook (may be NULL) is called after the EH reset is performed.  Based on
+existing conditions, severity of the problem, and hardware capabilities,
+	</para>
+
+	<para>
+Either 'softreset' (may be NULL) or 'hardreset' (may be NULL) will be
+called to perform the low-level EH reset.
+	</para>
+
+	<programlisting>
+void (*post_internal_cmd) (struct ata_queued_cmd *qc);
+	</programlisting>
+
+	<para>
+Perform any hardware-specific actions necessary to finish processing
+after executing a probe-time or EH-time command via ata_exec_internal().
 	</para>
 
 	</sect2>

drivers/ide/pci/amd74xx.c

···
 	{ PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_IDE,	0x50, AMD_UDMA_133 },
 	{ PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_IDE,	0x50, AMD_UDMA_133 },
 	{ PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_IDE,	0x50, AMD_UDMA_133 },
+	{ PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_IDE,	0x50, AMD_UDMA_133 },
 	{ PCI_DEVICE_ID_AMD_CS5536_IDE,			0x40, AMD_UDMA_100 },
 	{ 0 }
 };
···
 	/* 14 */ DECLARE_NV_DEV("NFORCE-MCP04"),
 	/* 15 */ DECLARE_NV_DEV("NFORCE-MCP51"),
 	/* 16 */ DECLARE_NV_DEV("NFORCE-MCP55"),
-	/* 17 */ DECLARE_AMD_DEV("AMD5536"),
+	/* 17 */ DECLARE_NV_DEV("NFORCE-MCP61"),
+	/* 18 */ DECLARE_AMD_DEV("AMD5536"),
 };
 
 static int __devinit amd74xx_probe(struct pci_dev *dev, const struct pci_device_id *id)
···
 	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_IDE,	PCI_ANY_ID, PCI_ANY_ID, 0, 0, 14 },
 	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_IDE,	PCI_ANY_ID, PCI_ANY_ID, 0, 0, 15 },
 	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_IDE,	PCI_ANY_ID, PCI_ANY_ID, 0, 0, 16 },
-	{ PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_CS5536_IDE,		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 17 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_IDE,	PCI_ANY_ID, PCI_ANY_ID, 0, 0, 17 },
+	{ PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_CS5536_IDE,		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 18 },
 	{ 0, },
 };
 MODULE_DEVICE_TABLE(pci, amd74xx_pci_tbl);

drivers/scsi/Makefile

···
 CFLAGS_ncr53c8xx.o	:= $(ncr53c8xx-flags-y) $(ncr53c8xx-flags-m)
 zalon7xx-objs	:= zalon.o ncr53c8xx.o
 NCR_Q720_mod-objs	:= NCR_Q720.o ncr53c8xx.o
-libata-objs	:= libata-core.o libata-scsi.o libata-bmdma.o
+libata-objs	:= libata-core.o libata-scsi.o libata-bmdma.o libata-eh.o
 oktagon_esp_mod-objs	:= oktagon_esp.o oktagon_io.o
 
 # Files generated that shall be removed upon make clean

drivers/scsi/ahci.c

···
 #include <asm/io.h>
 
 #define DRV_NAME	"ahci"
-#define DRV_VERSION	"1.2"
+#define DRV_VERSION	"1.3"
 
 
 enum {
···
 	AHCI_MAX_SG		= 168, /* hardware max is 64K */
 	AHCI_DMA_BOUNDARY	= 0xffffffff,
 	AHCI_USE_CLUSTERING	= 0,
-	AHCI_CMD_SLOT_SZ	= 32 * 32,
+	AHCI_MAX_CMDS		= 32,
+	AHCI_CMD_SZ		= 32,
+	AHCI_CMD_SLOT_SZ	= AHCI_MAX_CMDS * AHCI_CMD_SZ,
 	AHCI_RX_FIS_SZ		= 256,
-	AHCI_CMD_TBL_HDR	= 0x80,
 	AHCI_CMD_TBL_CDB	= 0x40,
-	AHCI_CMD_TBL_SZ		= AHCI_CMD_TBL_HDR + (AHCI_MAX_SG * 16),
-	AHCI_PORT_PRIV_DMA_SZ	= AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_SZ +
+	AHCI_CMD_TBL_HDR_SZ	= 0x80,
+	AHCI_CMD_TBL_SZ		= AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16),
+	AHCI_CMD_TBL_AR_SZ	= AHCI_CMD_TBL_SZ * AHCI_MAX_CMDS,
+	AHCI_PORT_PRIV_DMA_SZ	= AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_AR_SZ +
 				  AHCI_RX_FIS_SZ,
 	AHCI_IRQ_ON_SG		= (1 << 31),
 	AHCI_CMD_ATAPI		= (1 << 5),
···
 	AHCI_CMD_CLR_BUSY	= (1 << 10),
 
 	RX_FIS_D2H_REG		= 0x40,	/* offset of D2H Register FIS data */
+	RX_FIS_UNK		= 0x60, /* offset of Unknown FIS data */
 
 	board_ahci		= 0,
+	board_ahci_vt8251	= 1,
 
 	/* global controller registers */
 	HOST_CAP		= 0x00, /* host capabilities */
···
 	HOST_AHCI_EN		= (1 << 31), /* AHCI enabled */
 
 	/* HOST_CAP bits */
-	HOST_CAP_64		= (1 << 31), /* PCI DAC (64-bit DMA) support */
 	HOST_CAP_CLO		= (1 << 24), /* Command List Override support */
+	HOST_CAP_NCQ		= (1 << 30), /* Native Command Queueing */
+	HOST_CAP_64		= (1 << 31), /* PCI DAC (64-bit DMA) support */
 
 	/* registers for each SATA port */
 	PORT_LST_ADDR		= 0x00, /* command list DMA addr */
···
 	PORT_IRQ_PIOS_FIS	= (1 << 1), /* PIO Setup FIS rx'd */
 	PORT_IRQ_D2H_REG_FIS	= (1 << 0), /* D2H Register FIS rx'd */
 
-	PORT_IRQ_FATAL		= PORT_IRQ_TF_ERR |
-				  PORT_IRQ_HBUS_ERR |
-				  PORT_IRQ_HBUS_DATA_ERR |
-				  PORT_IRQ_IF_ERR,
-	DEF_PORT_IRQ		= PORT_IRQ_FATAL | PORT_IRQ_PHYRDY |
-				  PORT_IRQ_CONNECT | PORT_IRQ_SG_DONE |
-				  PORT_IRQ_UNK_FIS | PORT_IRQ_SDB_FIS |
-				  PORT_IRQ_DMAS_FIS | PORT_IRQ_PIOS_FIS |
-				  PORT_IRQ_D2H_REG_FIS,
+	PORT_IRQ_FREEZE		= PORT_IRQ_HBUS_ERR |
+				  PORT_IRQ_IF_ERR |
+				  PORT_IRQ_CONNECT |
+				  PORT_IRQ_PHYRDY |
+				  PORT_IRQ_UNK_FIS,
+	PORT_IRQ_ERROR		= PORT_IRQ_FREEZE |
+				  PORT_IRQ_TF_ERR |
+				  PORT_IRQ_HBUS_DATA_ERR,
+	DEF_PORT_IRQ		= PORT_IRQ_ERROR | PORT_IRQ_SG_DONE |
+				  PORT_IRQ_SDB_FIS | PORT_IRQ_DMAS_FIS |
+				  PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS,
 
 	/* PORT_CMD bits */
 	PORT_CMD_ATAPI		= (1 << 24), /* Device is ATAPI */
···
 
 	/* hpriv->flags bits */
 	AHCI_FLAG_MSI		= (1 << 0),
+
+	/* ap->flags bits */
+	AHCI_FLAG_RESET_NEEDS_CLO	= (1 << 24),
+	AHCI_FLAG_NO_NCQ		= (1 << 25),
 };
 
 struct ahci_cmd_hdr {
···
 	dma_addr_t		cmd_slot_dma;
 	void			*cmd_tbl;
 	dma_addr_t		cmd_tbl_dma;
-	struct ahci_sg		*cmd_tbl_sg;
 	void			*rx_fis;
 	dma_addr_t		rx_fis_dma;
 };
···
 static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
 static irqreturn_t ahci_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
-static int ahci_probe_reset(struct ata_port *ap, unsigned int *classes);
 static void ahci_irq_clear(struct ata_port *ap);
-static void ahci_eng_timeout(struct ata_port *ap);
 static int ahci_port_start(struct ata_port *ap);
 static void ahci_port_stop(struct ata_port *ap);
 static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static void ahci_qc_prep(struct ata_queued_cmd *qc);
 static u8 ahci_check_status(struct ata_port *ap);
-static inline int ahci_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
+static void ahci_freeze(struct ata_port *ap);
+static void ahci_thaw(struct ata_port *ap);
+static void ahci_error_handler(struct ata_port *ap);
+static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
 static void ahci_remove_one (struct pci_dev *pdev);
 
 static struct scsi_host_template ahci_sht = {
···
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.can_queue		= ATA_DEF_QUEUE,
+	.change_queue_depth	= ata_scsi_change_queue_depth,
+	.can_queue		= AHCI_MAX_CMDS - 1,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= AHCI_MAX_SG,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= AHCI_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 
 	.tf_read		= ahci_tf_read,
 
-	.probe_reset		= ahci_probe_reset,
-
 	.qc_prep		= ahci_qc_prep,
 	.qc_issue		= ahci_qc_issue,
-
-	.eng_timeout		= ahci_eng_timeout,
 
 	.irq_handler		= ahci_interrupt,
 	.irq_clear		= ahci_irq_clear,
 
 	.scr_read		= ahci_scr_read,
 	.scr_write		= ahci_scr_write,
+
+	.freeze			= ahci_freeze,
+	.thaw			= ahci_thaw,
+
+	.error_handler		= ahci_error_handler,
+	.post_internal_cmd	= ahci_post_internal_cmd,
 
 	.port_start		= ahci_port_start,
 	.port_stop		= ahci_port_stop,
···
 	{
 		.sht		= &ahci_sht,
 		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_SKIP_D2H_BSY,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &ahci_ops,
+	},
+	/* board_ahci_vt8251 */
+	{
+		.sht		= &ahci_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_SKIP_D2H_BSY |
+				  AHCI_FLAG_RESET_NEEDS_CLO | AHCI_FLAG_NO_NCQ,
 		.pio_mask	= 0x1f, /* pio0-4 */
 		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
 		.port_ops	= &ahci_ops,
···
 };
 
 static const struct pci_device_id ahci_pci_tbl[] = {
+	/* Intel */
 	{ PCI_VENDOR_ID_INTEL, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* ICH6 */
 	{ PCI_VENDOR_ID_INTEL, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
···
 	  board_ahci }, /* ICH8M */
 	{ PCI_VENDOR_ID_INTEL, 0x282a, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* ICH8M */
+
+	/* JMicron */
 	{ 0x197b, 0x2360, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* JMicron JMB360 */
+	{ 0x197b, 0x2361, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB361 */
 	{ 0x197b, 0x2363, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* JMicron JMB363 */
+	{ 0x197b, 0x2365, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB365 */
+	{ 0x197b, 0x2366, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB366 */
+
+	/* ATI */
 	{ PCI_VENDOR_ID_ATI, 0x4380, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* ATI SB600 non-raid */
 	{ PCI_VENDOR_ID_ATI, 0x4381, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	  board_ahci }, /* ATI SB600 raid */
+
+	/* VIA */
+	{ PCI_VENDOR_ID_VIA, 0x3349, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci_vt8251 }, /* VIA VT8251 */
+
+	/* NVIDIA */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044c, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044d, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044e, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044f, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+
 	{ }	/* terminate list */
 };
 
···
 	 */
 	pp->cmd_tbl = mem;
 	pp->cmd_tbl_dma = mem_dma;
-
-	pp->cmd_tbl_sg = mem + AHCI_CMD_TBL_HDR;
 
 	ap->private_data = pp;
 
···
 	return ata_dev_classify(&tf);
 }
 
-static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, u32 opts)
+static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
+			       u32 opts)
 {
-	pp->cmd_slot[0].opts = cpu_to_le32(opts);
-	pp->cmd_slot[0].status = 0;
-	pp->cmd_slot[0].tbl_addr = cpu_to_le32(pp->cmd_tbl_dma & 0xffffffff);
-	pp->cmd_slot[0].tbl_addr_hi = cpu_to_le32((pp->cmd_tbl_dma >> 16) >> 16);
+	dma_addr_t cmd_tbl_dma;
+
+	cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
+
+	pp->cmd_slot[tag].opts = cpu_to_le32(opts);
+	pp->cmd_slot[tag].status = 0;
+	pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
+	pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
 }
 
-static int ahci_poll_register(void __iomem *reg, u32 mask, u32 val,
-			      unsigned long interval_msec,
-			      unsigned long timeout_msec)
+static int ahci_clo(struct ata_port *ap)
 {
-	unsigned long timeout;
+	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
 	u32 tmp;
 
-	timeout = jiffies + (timeout_msec * HZ) / 1000;
-	do {
-		tmp = readl(reg);
-		if ((tmp & mask) == val)
-			return 0;
-		msleep(interval_msec);
-	} while (time_before(jiffies, timeout));
+	if (!(hpriv->cap & HOST_CAP_CLO))
+		return -EOPNOTSUPP;
 
-	return -1;
+	tmp = readl(port_mmio + PORT_CMD);
+	tmp |= PORT_CMD_CLO;
+	writel(tmp, port_mmio + PORT_CMD);
+
+	tmp = ata_wait_register(port_mmio + PORT_CMD,
+				PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
+	if (tmp & PORT_CMD_CLO)
+		return -EIO;
+
+	return 0;
 }
 
-static int ahci_softreset(struct ata_port *ap, int verbose, unsigned int *class)
+static int ahci_prereset(struct ata_port *ap)
 {
-	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	if ((ap->flags & AHCI_FLAG_RESET_NEEDS_CLO) &&
+	    (ata_busy_wait(ap, ATA_BUSY, 1000) & ATA_BUSY)) {
+		/* ATA_BUSY hasn't cleared, so send a CLO */
+		ahci_clo(ap);
+	}
+
+	return ata_std_prereset(ap);
+}
+
+static int ahci_softreset(struct ata_port *ap, unsigned int *class)
+{
 	struct ahci_port_priv *pp = ap->private_data;
 	void __iomem *mmio = ap->host_set->mmio_base;
 	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
 	const u32 cmd_fis_len = 5; /* five dwords */
 	const char *reason = NULL;
 	struct ata_taskfile tf;
+	u32 tmp;
 	u8 *fis;
 	int rc;
 
 	DPRINTK("ENTER\n");
+
+	if (ata_port_offline(ap)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		return 0;
+	}
 
 	/* prepare for SRST (AHCI-1.1 10.4.1) */
 	rc = ahci_stop_engine(ap);
···
 	/* check BUSY/DRQ, perform Command List Override if necessary */
 	ahci_tf_read(ap, &tf);
 	if (tf.command & (ATA_BUSY | ATA_DRQ)) {
-		u32 tmp;
+		rc = ahci_clo(ap);
 
-		if (!(hpriv->cap & HOST_CAP_CLO)) {
-			rc = -EIO;
-			reason = "port busy but no CLO";
+		if (rc == -EOPNOTSUPP) {
+			reason = "port busy but CLO unavailable";
 			goto fail_restart;
-		}
-
-		tmp = readl(port_mmio + PORT_CMD);
-		tmp |= PORT_CMD_CLO;
-		writel(tmp, port_mmio + PORT_CMD);
-		readl(port_mmio + PORT_CMD); /* flush */
-
-		if (ahci_poll_register(port_mmio + PORT_CMD, PORT_CMD_CLO, 0x0,
-				       1, 500)) {
-			rc = -EIO;
-			reason = "CLO failed";
+		} else if (rc) {
+			reason = "port busy but CLO failed";
 			goto fail_restart;
 		}
 	}
···
 	/* restart engine */
 	ahci_start_engine(ap);
 
-	ata_tf_init(ap, &tf, 0);
+	ata_tf_init(ap->device, &tf);
 	fis = pp->cmd_tbl;
 
 	/* issue the first D2H Register FIS */
-	ahci_fill_cmd_slot(pp, cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
+	ahci_fill_cmd_slot(pp, 0,
+			   cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
 
 	tf.ctl |= ATA_SRST;
 	ata_tf_to_fis(&tf, fis, 0);
 	fis[1] &= ~(1 << 7);	/* turn off Command FIS bit */
 
 	writel(1, port_mmio + PORT_CMD_ISSUE);
-	readl(port_mmio + PORT_CMD_ISSUE);	/* flush */
 
-	if (ahci_poll_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x0, 1, 500)) {
+	tmp = ata_wait_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x1, 1, 500);
+	if (tmp & 0x1) {
 		rc = -EIO;
 		reason = "1st FIS failed";
 		goto fail;
···
 	msleep(1);
 
 	/* issue the second D2H Register FIS */
-	ahci_fill_cmd_slot(pp, cmd_fis_len);
+	ahci_fill_cmd_slot(pp, 0, cmd_fis_len);
 
 	tf.ctl &= ~ATA_SRST;
 	ata_tf_to_fis(&tf, fis, 0);
···
 	msleep(150);
 
 	*class = ATA_DEV_NONE;
-	if (sata_dev_present(ap)) {
+	if (ata_port_online(ap)) {
 		if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
 			rc = -EIO;
 			reason = "device not ready";
···
  fail_restart:
 	ahci_start_engine(ap);
  fail:
-	if (verbose)
-		printk(KERN_ERR "ata%u: softreset failed (%s)\n",
-		       ap->id, reason);
-	else
-		DPRINTK("EXIT, rc=%d reason=\"%s\"\n", rc, reason);
+	ata_port_printk(ap, KERN_ERR, "softreset failed (%s)\n", reason);
 	return rc;
 }
 
-static int ahci_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
+static int ahci_hardreset(struct ata_port *ap, unsigned int *class)
 {
+	struct ahci_port_priv *pp = ap->private_data;
+	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+	struct ata_taskfile tf;
 	int rc;
 
 	DPRINTK("ENTER\n");
 
 	ahci_stop_engine(ap);
-	rc = sata_std_hardreset(ap, verbose, class);
+
+	/* clear D2H reception area to properly wait for D2H FIS */
+	ata_tf_init(ap->device, &tf);
+	tf.command = 0xff;
+	ata_tf_to_fis(&tf, d2h_fis, 0);
+
+	rc = sata_std_hardreset(ap, class);
+
 	ahci_start_engine(ap);
 
-	if (rc == 0)
+	if (rc == 0 && ata_port_online(ap))
 		*class = ahci_dev_classify(ap);
 	if (*class == ATA_DEV_UNKNOWN)
 		*class = ATA_DEV_NONE;
···
 	}
 }
 
-static int ahci_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
-	return ata_drive_probe_reset(ap, ata_std_probeinit,
-				     ahci_softreset, ahci_hardreset,
-				     ahci_postreset, classes);
-}
-
 static u8 ahci_check_status(struct ata_port *ap)
 {
 	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr;
···
 	ata_tf_from_fis(d2h_fis, tf);
 }
 
-static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc)
+static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 {
-	struct ahci_port_priv *pp = qc->ap->private_data;
 	struct scatterlist *sg;
 	struct ahci_sg *ahci_sg;
 	unsigned int n_sg = 0;
···
 	/*
 	 * Next, the S/G list.
 	 */
-	ahci_sg = pp->cmd_tbl_sg;
+	ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
 	ata_for_each_sg(sg, qc) {
 		dma_addr_t addr = sg_dma_address(sg);
 		u32 sg_len = sg_dma_len(sg);
···
 	struct ata_port *ap = qc->ap;
 	struct ahci_port_priv *pp = ap->private_data;
 	int is_atapi = is_atapi_taskfile(&qc->tf);
+	void *cmd_tbl;
 	u32 opts;
 	const u32 cmd_fis_len = 5; /* five dwords */
 	unsigned int n_elem;
···
 	 * Fill in command table information.  First, the header,
 	 * a SATA Register - Host to Device command FIS.
 	 */
-	ata_tf_to_fis(&qc->tf, pp->cmd_tbl, 0);
+	cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
+
+	ata_tf_to_fis(&qc->tf, cmd_tbl, 0);
 	if (is_atapi) {
-		memset(pp->cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
-		memcpy(pp->cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb,
-		       qc->dev->cdb_len);
+		memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
+		memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
 	}
 
 	n_elem = 0;
 	if (qc->flags & ATA_QCFLAG_DMAMAP)
-		n_elem = ahci_fill_sg(qc);
+		n_elem = ahci_fill_sg(qc, cmd_tbl);
 
 	/*
 	 * Fill in command slot information.
···
 	if (is_atapi)
 		opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
 
-	ahci_fill_cmd_slot(pp, opts);
+	ahci_fill_cmd_slot(pp, qc->tag, opts);
 }
 
-static void ahci_restart_port(struct ata_port *ap, u32 irq_stat)
+static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 {
-	void __iomem *mmio = ap->host_set->mmio_base;
-	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
-	u32 tmp;
+	struct ahci_port_priv *pp = ap->private_data;
+	struct ata_eh_info *ehi = &ap->eh_info;
+	unsigned int err_mask = 0, action = 0;
+	struct ata_queued_cmd *qc;
+	u32 serror;
 
-	if ((ap->device[0].class != ATA_DEV_ATAPI) ||
-	    ((irq_stat & PORT_IRQ_TF_ERR) == 0))
-		printk(KERN_WARNING "ata%u: port reset, "
-		       "p_is %x is %x pis %x cmd %x tf %x ss %x se %x\n",
-			ap->id,
-			irq_stat,
-			readl(mmio + HOST_IRQ_STAT),
-			readl(port_mmio + PORT_IRQ_STAT),
-			readl(port_mmio + PORT_CMD),
-			readl(port_mmio + PORT_TFDATA),
-			readl(port_mmio + PORT_SCR_STAT),
-			readl(port_mmio + PORT_SCR_ERR));
+	ata_ehi_clear_desc(ehi);
 
-	/* stop DMA */
-	ahci_stop_engine(ap);
+	/* AHCI needs SError cleared; otherwise, it might lock up */
+	serror = ahci_scr_read(ap, SCR_ERROR);
+	ahci_scr_write(ap, SCR_ERROR, serror);
 
-	/* clear SATA phy error, if any */
-	tmp = readl(port_mmio + PORT_SCR_ERR);
-	writel(tmp, port_mmio + PORT_SCR_ERR);
+	/* analyze @irq_stat */
+	ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
 
-	/* if DRQ/BSY is set, device needs to be reset.
-	 * if so, issue COMRESET
-	 */
-	tmp = readl(port_mmio + PORT_TFDATA);
-	if (tmp & (ATA_BUSY | ATA_DRQ)) {
-		writel(0x301, port_mmio + PORT_SCR_CTL);
-		readl(port_mmio + PORT_SCR_CTL); /* flush */
-		udelay(10);
-		writel(0x300, port_mmio + PORT_SCR_CTL);
-		readl(port_mmio + PORT_SCR_CTL); /* flush */
+	if (irq_stat & PORT_IRQ_TF_ERR)
+		err_mask |= AC_ERR_DEV;
+
+	if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
+		err_mask |= AC_ERR_HOST_BUS;
+		action |= ATA_EH_SOFTRESET;
 	}
 
-	/* re-start DMA */
-	ahci_start_engine(ap);
-}
+	if (irq_stat & PORT_IRQ_IF_ERR) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi, ", interface fatal error");
+	}
 
-static void ahci_eng_timeout(struct ata_port *ap)
-{
-	struct ata_host_set *host_set = ap->host_set;
-	void __iomem *mmio = host_set->mmio_base;
-	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
-	struct ata_queued_cmd *qc;
-	unsigned long flags;
+	if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
+		ata_ehi_hotplugged(ehi);
+		ata_ehi_push_desc(ehi, ", %s", irq_stat & PORT_IRQ_CONNECT ?
+			"connection status changed" : "PHY RDY changed");
+	}
 
-	printk(KERN_WARNING "ata%u: handling error/timeout\n", ap->id);
+	if (irq_stat & PORT_IRQ_UNK_FIS) {
+		u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
 
-	spin_lock_irqsave(&host_set->lock, flags);
+		err_mask |= AC_ERR_HSM;
+		action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi, ", unknown FIS %08x %08x %08x %08x",
+				  unk[0], unk[1], unk[2], unk[3]);
+	}
 
-	ahci_restart_port(ap, readl(port_mmio + PORT_IRQ_STAT));
+	/* okay, let's hand over to EH */
+	ehi->serror |= serror;
+	ehi->action |= action;
+
 	qc = ata_qc_from_tag(ap, ap->active_tag);
-	qc->err_mask |= AC_ERR_TIMEOUT;
+	if (qc)
+		qc->err_mask |= err_mask;
+	else
+		ehi->err_mask |= err_mask;
 
-	spin_unlock_irqrestore(&host_set->lock, flags);
-
-	ata_eh_qc_complete(qc);
+	if (irq_stat & PORT_IRQ_FREEZE)
+		ata_port_freeze(ap);
+	else
+		ata_port_abort(ap);
 }
 
-static inline int ahci_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
+static void ahci_host_intr(struct ata_port *ap)
 {
 	void __iomem *mmio = ap->host_set->mmio_base;
 	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
-	u32 status, serr, ci;
-
-	serr = readl(port_mmio + PORT_SCR_ERR);
-	writel(serr, port_mmio + PORT_SCR_ERR);
+	struct ata_eh_info *ehi = &ap->eh_info;
+	u32 status, qc_active;
+	int rc;
 
 	status = readl(port_mmio + PORT_IRQ_STAT);
 	writel(status, port_mmio + PORT_IRQ_STAT);
 
-	ci = readl(port_mmio + PORT_CMD_ISSUE);
-	if (likely((ci & 0x1) == 0)) {
-		if (qc) {
-			WARN_ON(qc->err_mask);
-			ata_qc_complete(qc);
-			qc = NULL;
-		}
+	if (unlikely(status & PORT_IRQ_ERROR)) {
+		ahci_error_intr(ap, status);
+		return;
 	}
 
-	if (status & PORT_IRQ_FATAL) {
-		unsigned int err_mask;
-		if (status & PORT_IRQ_TF_ERR)
-			err_mask = AC_ERR_DEV;
-		else if (status & PORT_IRQ_IF_ERR)
-			err_mask = AC_ERR_ATA_BUS;
-		else
-			err_mask = AC_ERR_HOST_BUS;
+	if (ap->sactive)
+		qc_active = readl(port_mmio + PORT_SCR_ACT);
+	else
+		qc_active = readl(port_mmio + PORT_CMD_ISSUE);
 
-		/* command processing has stopped due to error; restart */
-		ahci_restart_port(ap, status);
-
-		if (qc) {
-			qc->err_mask |= err_mask;
-			ata_qc_complete(qc);
-		}
+	rc = ata_qc_complete_multiple(ap, qc_active, NULL);
+	if (rc > 0)
+		return;
+	if (rc < 0) {
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_port_freeze(ap);
+		return;
 	}
 
-	return 1;
+	/* hmmm... a spurious interupt */
+
+	/* some devices send D2H reg with I bit set during NCQ command phase */
+	if (ap->sactive && status & PORT_IRQ_D2H_REG_FIS)
+		return;
+
+	/* ignore interim PIO setup fis interrupts */
+	if (ata_tag_valid(ap->active_tag)) {
+		struct ata_queued_cmd *qc =
+			ata_qc_from_tag(ap, ap->active_tag);
+
+		if (qc && qc->tf.protocol == ATA_PROT_PIO &&
+		    (status & PORT_IRQ_PIOS_FIS))
+			return;
+	}
+
+	if (ata_ratelimit())
+		ata_port_printk(ap, KERN_INFO, "spurious interrupt "
+				"(irq_stat 0x%x active_tag %d sactive 0x%x)\n",
+				status, ap->active_tag, ap->sactive);
 }
 
 static void ahci_irq_clear(struct ata_port *ap)
···
 	/* TODO */
 }
 
-static irqreturn_t ahci_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
+static irqreturn_t ahci_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
 {
 	struct ata_host_set *host_set = dev_instance;
 	struct ahci_host_priv *hpriv;
···
 
 		ap = host_set->ports[i];
 		if (ap) {
-			struct ata_queued_cmd *qc;
-			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (!ahci_host_intr(ap, qc))
-				if (ata_ratelimit())
-					dev_printk(KERN_WARNING, host_set->dev,
-					  "unhandled interrupt on port %u\n",
-					  i);
-
+			ahci_host_intr(ap);
 			VPRINTK("port %u\n", i);
 		} else {
 			VPRINTK("port %u (no irq)\n", i);
···
 		handled = 1;
 	}
 
-        spin_unlock(&host_set->lock);
+	spin_unlock(&host_set->lock);
 
 	VPRINTK("EXIT\n");
 
···
 	struct ata_port *ap = qc->ap;
 	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
 
-	writel(1, port_mmio + PORT_CMD_ISSUE);
+	if (qc->tf.protocol == ATA_PROT_NCQ)
+		writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
+	writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
 	readl(port_mmio + PORT_CMD_ISSUE);	/* flush */
 
 	return 0;
+}
+
+static void ahci_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+	/* turn IRQ off */
+	writel(0, port_mmio + PORT_IRQ_MASK);
+}
+
+static void ahci_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	u32 tmp;
+
+	/* clear IRQ */
+	tmp = readl(port_mmio + PORT_IRQ_STAT);
+	writel(tmp, port_mmio + PORT_IRQ_STAT);
+	writel(1 << ap->id, mmio + HOST_IRQ_STAT);
+
+	/* turn IRQ back on */
+	writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
+}
+
+static void ahci_error_handler(struct ata_port *ap)
+{
+	if (!(ap->flags & ATA_FLAG_FROZEN)) {
+		/* restart engine */
+		ahci_stop_engine(ap);
+		ahci_start_engine(ap);
+	}
+
+	/* perform recovery */
+	ata_do_eh(ap, ahci_prereset, ahci_softreset, ahci_hardreset,
+		  ahci_postreset);
+}
+
+static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		qc->err_mask |= AC_ERR_OTHER;
+
+	if (qc->err_mask) {
+		/* make DMA engine forget about the failed command */
+		ahci_stop_engine(ap);
+		ahci_start_engine(ap);
+	}
 }
 
 static void ahci_setup_port(struct ata_ioports *port, unsigned long base,
···
 			writel(tmp, port_mmio + PORT_IRQ_STAT);
 
 		writel(1 << i, mmio + HOST_IRQ_STAT);
-
-		/* set irq mask (enables interrupts) */
-		writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
 	}
 
 	tmp = readl(mmio + HOST_CTL);
···
 
 	VPRINTK("ENTER\n");
 
+	WARN_ON(ATA_MAX_QUEUE > AHCI_MAX_CMDS);
+
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
···
 	if (rc)
 		goto err_out_hpriv;
 
+	if (!(probe_ent->host_flags & AHCI_FLAG_NO_NCQ) &&
+	    (hpriv->cap & HOST_CAP_NCQ))
+		probe_ent->host_flags |= ATA_FLAG_NCQ;
+
 	ahci_print_info(probe_ent);
 
 	/* FIXME: check ata_device_add return value */
···
 	struct device *dev = pci_dev_to_dev(pdev);
 	struct ata_host_set *host_set = dev_get_drvdata(dev);
 	struct ahci_host_priv *hpriv = host_set->private_data;
-	struct ata_port *ap;
 	unsigned int i;
 	int have_msi;
 
-	for (i = 0; i < host_set->n_ports; i++) {
-		ap = host_set->ports[i];
-
-		scsi_remove_host(ap->host);
-	}
+	for (i = 0; i < host_set->n_ports; i++)
+		ata_port_detach(host_set->ports[i]);
 
 	have_msi = hpriv->flags & AHCI_FLAG_MSI;
 	free_irq(host_set->irq, host_set);
 
 	for (i = 0; i < host_set->n_ports; i++) {
-		ap = host_set->ports[i];
+		struct ata_port *ap = host_set->ports[i];
 
 		ata_scsi_release(ap->host);
 		scsi_host_put(ap->host);

drivers/scsi/ata_piix.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"ata_piix"
-#define DRV_VERSION	"1.05"
+#define DRV_VERSION	"1.10"
 
 enum {
 	PIIX_IOCFG		= 0x54, /* IDE I/O configuration register */
···
 
 static int piix_init_one (struct pci_dev *pdev,
 				    const struct pci_device_id *ent);
-
-static int piix_pata_probe_reset(struct ata_port *ap, unsigned int *classes);
-static int piix_sata_probe_reset(struct ata_port *ap, unsigned int *classes);
 static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev);
 static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev);
+static void piix_pata_error_handler(struct ata_port *ap);
+static void piix_sata_error_handler(struct ata_port *ap);
 
 static unsigned int in_module_init = 1;
 
···
 	{ 0x8086, 0x7111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix4_pata },
 	{ 0x8086, 0x24db, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
 	{ 0x8086, 0x25a2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+	{ 0x8086, 0x27df, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
 #endif
 
 	/* NOTE: The following PCI ids must be kept in sync with the
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 	.resume			= ata_scsi_device_resume,
 	.suspend		= ata_scsi_device_suspend,
···
 	.port_disable		= ata_port_disable,
 	.set_piomode		= piix_set_piomode,
 	.set_dmamode		= piix_set_dmamode,
+	.mode_filter		= ata_pci_default_filter,
 
 	.tf_load		= ata_tf_load,
 	.tf_read		= ata_tf_read,
···
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
 
-	.probe_reset		= piix_pata_probe_reset,
-
 	.bmdma_setup		= ata_bmdma_setup,
 	.bmdma_start		= ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
 
-	.eng_timeout		= ata_eng_timeout,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= piix_pata_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
···
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
 
-	.probe_reset		= piix_sata_probe_reset,
-
 	.bmdma_setup		= ata_bmdma_setup,
 	.bmdma_start		= ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
 
-	.eng_timeout		= ata_eng_timeout,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= piix_sata_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
···
 }
 
 /**
- *	piix_pata_probeinit - probeinit for PATA host controller
+ *	piix_pata_prereset - prereset for PATA host controller
  *	@ap: Target port
  *
- *	Probeinit including cable detection.
+ *	Prereset including cable detection.
  *
  *	LOCKING:
  *	None (inherited from caller).
  */
-static void piix_pata_probeinit(struct ata_port *ap)
-{
-	piix_pata_cbl_detect(ap);
-	ata_std_probeinit(ap);
-}
-
-/**
- *	piix_pata_probe_reset - Perform reset on PATA port and classify
- *	@ap: Port to reset
- *	@classes: Resulting classes of attached devices
- *
- *	Reset PATA phy and classify attached devices.
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-static int piix_pata_probe_reset(struct ata_port *ap, unsigned int *classes)
+static int piix_pata_prereset(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
 
 	if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->hard_port_no])) {
-		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
+		ata_port_printk(ap, KERN_INFO, "port disabled. ignoring.\n");
+		ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
 		return 0;
 	}
 
-	return ata_drive_probe_reset(ap, piix_pata_probeinit,
-				     ata_std_softreset, NULL,
-				     ata_std_postreset, classes);
+	piix_pata_cbl_detect(ap);
+
+	return ata_std_prereset(ap);
+}
+
+static void piix_pata_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, piix_pata_prereset, ata_std_softreset, NULL,
+			   ata_std_postreset);
 }
 
 /**
- *	piix_sata_probe - Probe PCI device for present SATA devices
- *	@ap: Port associated with the PCI device we wish to probe
+ *	piix_sata_prereset - prereset for SATA host controller
+ *	@ap: Target port
  *
  *	Reads and configures SATA PCI device's PCI config register
  *	Port Configuration and Status (PCS) to determine port and
- *	device availability.
+ *	device availability.  Return -ENODEV to skip reset if no
+ *	device is present.
  *
  *	LOCKING:
  *	None (inherited from caller).
  *
  *	RETURNS:
- *	Mask of avaliable devices on the port.
+ *	0 if device is present, -ENODEV otherwise.
  */
-static unsigned int piix_sata_probe (struct ata_port *ap)
+static int piix_sata_prereset(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
 	const unsigned int *map = ap->host_set->private_data;
···
 	DPRINTK("ata%u: LEAVE, pcs=0x%x present_mask=0x%x\n",
 		ap->id, pcs, present_mask);
 
-	return present_mask;
-}
-
-/**
- *	piix_sata_probe_reset - Perform reset on SATA port and classify
- *	@ap: Port to reset
- *	@classes: Resulting classes of attached devices
- *
- *	Reset SATA phy and classify attached devices.
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-static int piix_sata_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
-	if (!piix_sata_probe(ap)) {
-		printk(KERN_INFO "ata%u: SATA port has no device.\n", ap->id);
+	if (!present_mask) {
+		ata_port_printk(ap, KERN_INFO, "SATA port has no device.\n");
+		ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
 		return 0;
 	}
 
-	return ata_drive_probe_reset(ap, ata_std_probeinit,
-				     ata_std_softreset, NULL,
-				     ata_std_postreset, classes);
+	return ata_std_prereset(ap);
+}
+
+static void piix_sata_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, piix_sata_prereset, ata_std_softreset, NULL,
+			   ata_std_postreset);
 }
 
 /**
···
 		pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
 		pci_read_config_word(pdev, 0x41, &cfg);
 		/* Only on the original revision: IDE DMA can hang */
-		if(rev == 0x00)
+		if (rev == 0x00)
 			no_piix_dma = 1;
 		/* On all revisions below 5 PXB bus lock must be disabled for IDE */
-		else if(cfg & (1<<14) && rev < 5)
+		else if (cfg & (1<<14) && rev < 5)
 			no_piix_dma = 2;
 	}
-	if(no_piix_dma)
+	if (no_piix_dma)
 		dev_printk(KERN_WARNING, &ata_dev->dev, "450NX errata present, disabling IDE DMA.\n");
-	if(no_piix_dma == 2)
+	if (no_piix_dma == 2)
 		dev_printk(KERN_WARNING, &ata_dev->dev, "A BIOS update may resolve this.\n");
 	return no_piix_dma;
 }

drivers/scsi/libata-bmdma.c

···
 	ata_altstatus(ap);        /* dummy read */
 }
 
+/**
+ *	ata_bmdma_freeze - Freeze BMDMA controller port
+ *	@ap: port to freeze
+ *
+ *	Freeze BMDMA controller port.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_bmdma_freeze(struct ata_port *ap)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	ap->ctl |= ATA_NIEN;
+	ap->last_ctl = ap->ctl;
+
+	if (ap->flags & ATA_FLAG_MMIO)
+		writeb(ap->ctl, (void __iomem *)ioaddr->ctl_addr);
+	else
+		outb(ap->ctl, ioaddr->ctl_addr);
+}
+
+/**
+ *	ata_bmdma_thaw - Thaw BMDMA controller port
+ *	@ap: port to thaw
+ *
+ *	Thaw BMDMA controller port.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_bmdma_thaw(struct ata_port *ap)
+{
+	/* clear & re-enable interrupts */
+	ata_chk_status(ap);
+	ap->ops->irq_clear(ap);
+	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
+		ata_irq_on(ap);
+}
+
+/**
+ *	ata_bmdma_drive_eh - Perform EH with given methods for BMDMA controller
+ *	@ap: port to handle error for
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	Handle error for ATA BMDMA controller.  It can handle both
+ *	PATA and SATA controllers.  Many controllers should be able to
+ *	use this EH as-is or with some added handling before and
+ *	after.
+ *
+ *	This function is intended to be used for constructing
+ *	->error_handler callback by low level drivers.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+			ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+			ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+	int thaw = 0;
+
+	qc = __ata_qc_from_tag(ap, ap->active_tag);
+	if (qc && !(qc->flags & ATA_QCFLAG_FAILED))
+		qc = NULL;
+
+	/* reset PIO HSM and stop DMA engine */
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->hsm_task_state = HSM_ST_IDLE;
+
+	if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
+		   qc->tf.protocol == ATA_PROT_ATAPI_DMA)) {
+		u8 host_stat;
+
+		host_stat = ata_bmdma_status(ap);
+
+		ata_ehi_push_desc(&ehc->i, "BMDMA stat 0x%x", host_stat);
+
+		/* BMDMA controllers indicate host bus error by
+		 * setting DMA_ERR bit and timing out.  As it wasn't
+		 * really a timeout event, adjust error mask and
+		 * cancel frozen state.
+		 */
+		if (qc->err_mask == AC_ERR_TIMEOUT && host_stat & ATA_DMA_ERR) {
+			qc->err_mask = AC_ERR_HOST_BUS;
+			thaw = 1;
+		}
+
+		ap->ops->bmdma_stop(qc);
+	}
+
+	ata_altstatus(ap);
+	ata_chk_status(ap);
+	ap->ops->irq_clear(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	if (thaw)
+		ata_eh_thaw_port(ap);
+
+	/* PIO and DMA engines have been stopped, perform recovery */
+	ata_do_eh(ap, prereset, softreset, hardreset, postreset);
+}
+
+/**
+ *	ata_bmdma_error_handler - Stock error handler for BMDMA controller
+ *	@ap: port to handle error for
+ *
+ *	Stock error handler for BMDMA controller.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_error_handler(struct ata_port *ap)
+{
+	ata_reset_fn_t hardreset;
+
+	hardreset = NULL;
+	if (sata_scr_valid(ap))
+		hardreset = sata_std_hardreset;
+
+	ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, hardreset,
+			   ata_std_postreset);
+}
+
+/**
+ *	ata_bmdma_post_internal_cmd - Stock post_internal_cmd for
+ *				      BMDMA controller
+ *	@qc: internal command to clean up
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	ata_bmdma_stop(qc);
+}
+
 #ifdef CONFIG_PCI
 static struct ata_probe_ent *
 ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
···
 
 	/* FIXME: check ata_device_add return */
 	if (legacy_mode) {
-		if (legacy_mode & (1 << 0))
+		struct device *dev = &pdev->dev;
+		struct ata_host_set *host_set = NULL;
+
+		if (legacy_mode & (1 << 0)) {
 			ata_device_add(probe_ent);
-		if (legacy_mode & (1 << 1))
+			host_set = dev_get_drvdata(dev);
+		}
+
+		if (legacy_mode & (1 << 1)) {
 			ata_device_add(probe_ent2);
+			if (host_set) {
+				host_set->next = dev_get_drvdata(dev);
+				dev_set_drvdata(dev, host_set);
+			}
+		}
 	} else
 		ata_device_add(probe_ent);
 

drivers/scsi/libata-core.c

···
 
 #include "libata.h"
 
-static unsigned int ata_dev_init_params(struct ata_port *ap,
-					struct ata_device *dev,
-					u16 heads,
-					u16 sectors);
-static void ata_set_mode(struct ata_port *ap);
-static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
-					 struct ata_device *dev);
-static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
+/* debounce timing parameters in msecs { interval, duration, timeout } */
+const unsigned long sata_deb_timing_boot[]		= {   5,  100, 2000 };
+const unsigned long sata_deb_timing_eh[]		= {  25,  500, 2000 };
+const unsigned long sata_deb_timing_before_fsrst[]	= { 100, 2000, 5000 };
+
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors);
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static void ata_dev_xfermask(struct ata_device *dev);
 
 static unsigned int ata_unique_id = 1;
 static struct workqueue_struct *ata_wq;
 
+struct workqueue_struct *ata_aux_wq;
+
 int atapi_enabled = 1;
 module_param(atapi_enabled, int, 0444);
 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
+
+int atapi_dmadir = 0;
+module_param(atapi_dmadir, int, 0444);
+MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
 
 int libata_fua = 0;
 module_param_named(fua, libata_fua, int, 0444);
···
 	return "<n/a>";
 }
 
-static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
+static const char *sata_spd_string(unsigned int spd)
 {
-	if (ata_dev_present(dev)) {
-		printk(KERN_WARNING "ata%u: dev %u disabled\n",
-		       ap->id, dev->devno);
+	static const char * const spd_str[] = {
+		"1.5 Gbps",
+		"3.0 Gbps",
+	};
+
+	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
+		return "<unknown>";
+	return spd_str[spd - 1];
+}
+
+void ata_dev_disable(struct ata_device *dev)
+{
+	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
+		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
 		dev->class++;
 	}
 }
···
 void ata_dev_select(struct ata_port *ap, unsigned int device,
 			   unsigned int wait, unsigned int can_sleep)
 {
-	VPRINTK("ENTER, ata%u: device %u, wait %u\n",
-		ap->id, device, wait);
+	if (ata_msg_probe(ap)) {
+		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
+				"device %u, wait %u\n",
+				ap->id, device, wait);
+	}
 
 	if (wait)
 		ata_wait_idle(ap);
···
 
 	DPRINTK("ENTER\n");
 
-	spin_lock_irqsave(&ap->host_set->lock, flags);
+	spin_lock_irqsave(ap->lock, flags);
 	ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+	spin_unlock_irqrestore(ap->lock, flags);
 
 	DPRINTK("flush #1\n");
 	flush_workqueue(ata_wq);
···
 	 * Cancel and flush.
 	 */
 	if (!cancel_delayed_work(&ap->port_task)) {
-		DPRINTK("flush #2\n");
+		if (ata_msg_ctl(ap))
+			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n", __FUNCTION__);
 		flush_workqueue(ata_wq);
 	}
 
-	spin_lock_irqsave(&ap->host_set->lock, flags);
+	spin_lock_irqsave(ap->lock, flags);
 	ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+	spin_unlock_irqrestore(ap->lock, flags);
 
-	DPRINTK("EXIT\n");
+	if (ata_msg_ctl(ap))
+		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
 }
 
 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
 {
 	struct completion *waiting = qc->private_data;
 
-	qc->ap->ops->tf_read(qc->ap, &qc->tf);
 	complete(waiting);
 }
 
 /**
  *	ata_exec_internal - execute libata internal command
- *	@ap: Port to which the command is sent
  *	@dev: Device to which the command is sent
  *	@tf: Taskfile registers for the command and the result
+ *	@cdb: CDB for packet command
  *	@dma_dir: Data tranfer direction of the command
  *	@buf: Data buffer of the command
  *	@buflen: Length of data buffer
···
  *
  *	LOCKING:
  *	None.  Should be called with kernel context, might sleep.
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
  */
-
-static unsigned
-ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
-		  struct ata_taskfile *tf,
-		  int dma_dir, void *buf, unsigned int buflen)
+unsigned ata_exec_internal(struct ata_device *dev,
+			   struct ata_taskfile *tf, const u8 *cdb,
+			   int dma_dir, void *buf, unsigned int buflen)
 {
+	struct ata_port *ap = dev->ap;
 	u8 command = tf->command;
 	struct ata_queued_cmd *qc;
+	unsigned int tag, preempted_tag;
+	u32 preempted_sactive, preempted_qc_active;
 	DECLARE_COMPLETION(wait);
 	unsigned long flags;
 	unsigned int err_mask;
+	int rc;
 
-	spin_lock_irqsave(&ap->host_set->lock, flags);
+	spin_lock_irqsave(ap->lock, flags);
 
-	qc = ata_qc_new_init(ap, dev);
-	BUG_ON(qc == NULL);
+	/* no internal command while frozen */
+	if (ap->flags & ATA_FLAG_FROZEN) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		return AC_ERR_SYSTEM;
+	}
 
+	/* initialize internal qc */
+
+	/* XXX: Tag 0 is used for drivers with legacy EH as some
+	 * drivers choke if any other tag is given.  This breaks
+	 * ata_tag_internal() test for those drivers.  Don't use new
+	 * EH stuff without converting to it.
+	 */
+	if (ap->ops->error_handler)
+		tag = ATA_TAG_INTERNAL;
+	else
+		tag = 0;
+
+	if (test_and_set_bit(tag, &ap->qc_allocated))
+		BUG();
+	qc = __ata_qc_from_tag(ap, tag);
+
+	qc->tag = tag;
+	qc->scsicmd = NULL;
+	qc->ap = ap;
+	qc->dev = dev;
+	ata_qc_reinit(qc);
+
+	preempted_tag = ap->active_tag;
+	preempted_sactive = ap->sactive;
+	preempted_qc_active = ap->qc_active;
+	ap->active_tag = ATA_TAG_POISON;
+	ap->sactive = 0;
+	ap->qc_active = 0;
+
+	/* prepare & issue qc */
 	qc->tf = *tf;
+	if (cdb)
+		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
 	qc->dma_dir = dma_dir;
 	if (dma_dir != DMA_NONE) {
 		ata_sg_init_one(qc, buf, buflen);
···
 
 	ata_qc_issue(qc);
 
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+	spin_unlock_irqrestore(ap->lock, flags);
 
-	if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
-		ata_port_flush_task(ap);
+	rc = wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL);
 
-		spin_lock_irqsave(&ap->host_set->lock, flags);
+	ata_port_flush_task(ap);
+
+	if (!rc) {
+		spin_lock_irqsave(ap->lock, flags);
 
 		/* We're racing with irq here.  If we lose, the
 		 * following test prevents us from completing the qc
-		 * again.  If completion irq occurs after here but
-		 * before the caller cleans up, it will result in a
-		 * spurious interrupt.  We can live with that.
+		 * twice.  If we win, the port is frozen and will be
+		 * cleaned up by ->post_internal_cmd().
 		 */
 		if (qc->flags & ATA_QCFLAG_ACTIVE) {
-			qc->err_mask = AC_ERR_TIMEOUT;
-			ata_qc_complete(qc);
-			printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
-			       ap->id, command);
+			qc->err_mask |= AC_ERR_TIMEOUT;
+
+			if (ap->ops->error_handler)
+				ata_port_freeze(ap);
+			else
+				ata_qc_complete(qc);
+
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING,
+				       "qc timeout (cmd 0x%x)\n", command);
 		}
 
-		spin_unlock_irqrestore(&ap->host_set->lock, flags);
+		spin_unlock_irqrestore(ap->lock, flags);
 	}
 
-	*tf = qc->tf;
+	/* do post_internal_cmd */
+	if (ap->ops->post_internal_cmd)
+		ap->ops->post_internal_cmd(qc);
+
+	if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
+		if (ata_msg_warn(ap))
+			ata_dev_printk(dev, KERN_WARNING, 
+				"zero err_mask for failed "
+			       "internal command, assuming AC_ERR_OTHER\n");
+		qc->err_mask |= AC_ERR_OTHER;
+	}
+
+	/* finish up */
+	spin_lock_irqsave(ap->lock, flags);
+
+	*tf = qc->result_tf;
 	err_mask = qc->err_mask;
 
 	ata_qc_free(qc);
+	ap->active_tag = preempted_tag;
+	ap->sactive = preempted_sactive;
+	ap->qc_active = preempted_qc_active;
 
 	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
 	 * Until those drivers are fixed, we detect the condition
···
 	 *
 	 * Kill the following code as soon as those drivers are fixed.
 	 */
-	if (ap->flags & ATA_FLAG_PORT_DISABLED) {
+	if (ap->flags & ATA_FLAG_DISABLED) {
 		err_mask |= AC_ERR_SYSTEM;
 		ata_port_probe(ap);
 	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
 
 	return err_mask;
 }
···
 
 /**
  *	ata_dev_read_id - Read ID data from the specified device
- *	@ap: port on which target device resides
  *	@dev: target device
  *	@p_class: pointer to class of the target device (may be changed)
  *	@post_reset: is this read ID post-reset?
- *	@p_id: read IDENTIFY page (newly allocated)
+ *	@id: buffer to read IDENTIFY data into
  *
  *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
  *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
···
  *	RETURNS:
  *	0 on success, -errno otherwise.
  */
-static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
-			   unsigned int *p_class, int post_reset, u16 **p_id)
+int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+		    int post_reset, u16 *id)
 {
+	struct ata_port *ap = dev->ap;
 	unsigned int class = *p_class;
 	struct ata_taskfile tf;
 	unsigned int err_mask = 0;
-	u16 *id;
 	const char *reason;
 	int rc;
 
-	DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
+	if (ata_msg_ctl(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n", 
+				__FUNCTION__, ap->id, dev->devno);
 
 	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 
-	id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
-	if (id == NULL) {
-		rc = -ENOMEM;
-		reason = "out of memory";
-		goto err_out;
-	}
-
  retry:
-	ata_tf_init(ap, &tf, dev->devno);
+	ata_tf_init(dev, &tf);
 
 	switch (class) {
 	case ATA_DEV_ATA:
···
 
 	tf.protocol = ATA_PROT_PIO;
 
-	err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
 				     id, sizeof(id[0]) * ATA_ID_WORDS);
 	if (err_mask) {
 		rc = -EIO;
···
 		 * Some drives were very specific about that exact sequence.
 		 */
 		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
-			err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
+			err_mask = ata_dev_init_params(dev, id[3], id[6]);
 			if (err_mask) {
 				rc = -EIO;
 				reason = "INIT_DEV_PARAMS failed";
···
 	}
 
 	*p_class = class;
-	*p_id = id;
+
 	return 0;
 
  err_out:
-	printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
-	       ap->id, dev->devno, reason);
-	kfree(id);
+	if (ata_msg_warn(ap)) 
+		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
+		       "(%s, err_mask=0x%x)\n", reason, err_mask);
 	return rc;
 }
 
-static inline u8 ata_dev_knobble(const struct ata_port *ap,
-				 struct ata_device *dev)
+static inline u8 ata_dev_knobble(struct ata_device *dev)
 {
-	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
+	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
+}
+
+static void ata_dev_config_ncq(struct ata_device *dev,
+			       char *desc, size_t desc_sz)
+{
+	struct ata_port *ap = dev->ap;
+	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
+
+	if (!ata_id_has_ncq(dev->id)) {
+		desc[0] = '\0';
+		return;
+	}
+
+	if (ap->flags & ATA_FLAG_NCQ) {
+		hdepth = min(ap->host->can_queue, ATA_MAX_QUEUE - 1);
+		dev->flags |= ATA_DFLAG_NCQ;
+	}
+
+	if (hdepth >= ddepth)
+		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
+	else
+		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
 }
 
 /**
  *	ata_dev_configure - Configure the specified ATA/ATAPI device
- *	@ap: Port on which target device resides
  *	@dev: Target device to configure
  *	@print_info: Enable device info printout
  *
···
  *	RETURNS:
  *	0 on success, -errno otherwise
  */
-static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
-			     int print_info)
+int ata_dev_configure(struct ata_device *dev, int print_info)
 {
+	struct ata_port *ap = dev->ap;
 	const u16 *id = dev->id;
 	unsigned int xfer_mask;
 	int i, rc;
 
-	if (!ata_dev_present(dev)) {
-		DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
-			ap->id, dev->devno);
+	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
+		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
+			__FUNCTION__, ap->id, dev->devno);
 		return 0;
 	}
 
-	DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n", 
+			__FUNCTION__, ap->id, dev->devno);
 
 	/* print device capabilities */
-	if (print_info)
-		printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
-		       "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
-		       ap->id, dev->devno, id[49], id[82], id[83],
-		       id[84], id[85], id[86], id[87], id[88]);
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: cfg 49:%04x 82:%04x 83:%04x "
+			       "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
+			       __FUNCTION__,
+			       id[49], id[82], id[83], id[84],
+			       id[85], id[86], id[87], id[88]);
 
 	/* initialize to-be-configured parameters */
-	dev->flags = 0;
+	dev->flags &= ~ATA_DFLAG_CFG_MASK;
 	dev->max_sectors = 0;
 	dev->cdb_len = 0;
 	dev->n_sectors = 0;
···
 	/* find max transfer mode; for printk only */
 	xfer_mask = ata_id_xfermask(id);
 
-	ata_dump_id(id);
+	if (ata_msg_probe(ap))
+		ata_dump_id(id);
 
 	/* ATA-specific feature tests */
 	if (dev->class == ATA_DEV_ATA) {
···
 
 		if (ata_id_has_lba(id)) {
 			const char *lba_desc;
+			char ncq_desc[20];
 
 			lba_desc = "LBA";
 			dev->flags |= ATA_DFLAG_LBA;
···
 				lba_desc = "LBA48";
 			}
 
+			/* config NCQ */
+			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
+
 			/* print device info to dmesg */
-			if (print_info)
-				printk(KERN_INFO "ata%u: dev %u ATA-%d, "
-				       "max %s, %Lu sectors: %s\n",
-				       ap->id, dev->devno,
-				       ata_id_major_version(id),
-				       ata_mode_string(xfer_mask),
-				       (unsigned long long)dev->n_sectors,
-				       lba_desc);
+			if (ata_msg_info(ap))
+				ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
+					"max %s, %Lu sectors: %s %s\n",
+					ata_id_major_version(id),
+					ata_mode_string(xfer_mask),
+					(unsigned long long)dev->n_sectors,
+					lba_desc, ncq_desc);
 		} else {
 			/* CHS */
 
···
 			}
 
 			/* print device info to dmesg */
-			if (print_info)
-				printk(KERN_INFO "ata%u: dev %u ATA-%d, "
-				       "max %s, %Lu sectors: CHS %u/%u/%u\n",
-				       ap->id, dev->devno,
-				       ata_id_major_version(id),
-				       ata_mode_string(xfer_mask),
-				       (unsigned long long)dev->n_sectors,
-				       dev->cylinders, dev->heads, dev->sectors);
+			if (ata_msg_info(ap))
+				ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
+					"max %s, %Lu sectors: CHS %u/%u/%u\n",
+					ata_id_major_version(id),
+					ata_mode_string(xfer_mask),
+					(unsigned long long)dev->n_sectors,
+					dev->cylinders, dev->heads, dev->sectors);
+		}
+
+		if (dev->id[59] & 0x100) {
+			dev->multi_count = dev->id[59] & 0xff;
+			if (ata_msg_info(ap))
+				ata_dev_printk(dev, KERN_INFO, "ata%u: dev %u multi count %u\n",
+				ap->id, dev->devno, dev->multi_count);
 		}
 
 		dev->cdb_len = 16;
···
 
 	/* ATAPI-specific feature tests */
 	else if (dev->class == ATA_DEV_ATAPI) {
+		char *cdb_intr_string = "";
+
 		rc = atapi_cdb_len(id);
 		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
-			printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING, 
+					"unsupported CDB len\n");
 			rc = -EINVAL;
 			goto err_out_nosup;
 		}
 		dev->cdb_len = (unsigned int) rc;
 
+		if (ata_id_cdb_intr(dev->id)) {
+			dev->flags |= ATA_DFLAG_CDB_INTR;
+			cdb_intr_string = ", CDB intr";
+		}
+
 		/* print device info to dmesg */
-		if (print_info)
-			printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
-			       ap->id, dev->devno, ata_mode_string(xfer_mask));
+		if (ata_msg_info(ap))
+			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
+				       ata_mode_string(xfer_mask),
+				       cdb_intr_string);
 	}
 
 	ap->host->max_cmd_len = 0;
···
 					      ap->device[i].cdb_len);
 
 	/* limit bridge transfers to udma5, 200 sectors */
-	if (ata_dev_knobble(ap, dev)) {
-		if (print_info)
-			printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
-			       ap->id, dev->devno);
+	if (ata_dev_knobble(dev)) {
+		if (ata_msg_info(ap))
+			ata_dev_printk(dev, KERN_INFO,
+				       "applying bridge limits\n");
 		dev->udma_mask &= ATA_UDMA5;
 		dev->max_sectors = ATA_MAX_SECTORS;
 	}
···
 	if (ap->ops->dev_config)
 		ap->ops->dev_config(ap, dev);
 
-	DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
+			__FUNCTION__, ata_chk_status(ap));
 	return 0;
 
 err_out_nosup:
-	DPRINTK("EXIT, err\n");
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, 
+				"%s: EXIT, err\n", __FUNCTION__);
 	return rc;
 }
 
···
  *	PCI/etc. bus probe sem.
  *
  *	RETURNS:
- *	Zero on success, non-zero on error.
+ *	Zero on success, negative errno otherwise.
  */
 
 static int ata_bus_probe(struct ata_port *ap)
 {
 	unsigned int classes[ATA_MAX_DEVICES];
-	unsigned int i, rc, found = 0;
+	int tries[ATA_MAX_DEVICES];
+	int i, rc, down_xfermask;
+	struct ata_device *dev;
 
 	ata_port_probe(ap);
 
-	/* reset and determine device classes */
 	for (i = 0; i < ATA_MAX_DEVICES; i++)
-		classes[i] = ATA_DEV_UNKNOWN;
+		tries[i] = ATA_PROBE_MAX_TRIES;
 
-	if (ap->ops->probe_reset) {
-		rc = ap->ops->probe_reset(ap, classes);
-		if (rc) {
-			printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
-			return rc;
-		}
-	} else {
-		ap->ops->phy_reset(ap);
+ retry:
+	down_xfermask = 0;
 
-		if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
-			for (i = 0; i < ATA_MAX_DEVICES; i++)
-				classes[i] = ap->device[i].class;
+	/* reset and determine device classes */
+	ap->ops->phy_reset(ap);
 
-		ata_port_probe(ap);
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		if (!(ap->flags & ATA_FLAG_DISABLED) &&
+		    dev->class != ATA_DEV_UNKNOWN)
+			classes[dev->devno] = dev->class;
+		else
+			classes[dev->devno] = ATA_DEV_NONE;
+
+		dev->class = ATA_DEV_UNKNOWN;
 	}
 
+	ata_port_probe(ap);
+
+	/* after the reset the device state is PIO 0 and the controller
+	   state is undefined. Record the mode */
+
 	for (i = 0; i < ATA_MAX_DEVICES; i++)
-		if (classes[i] == ATA_DEV_UNKNOWN)
-			classes[i] = ATA_DEV_NONE;
+		ap->device[i].pio_mode = XFER_PIO_0;
 
 	/* read IDENTIFY page and configure devices */
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
-		struct ata_device *dev = &ap->device[i];
+		dev = &ap->device[i];
 
-		dev->class = classes[i];
+		if (tries[i])
+			dev->class = classes[i];
 
-		if (!ata_dev_present(dev))
+		if (!ata_dev_enabled(dev))
 			continue;
 
-		WARN_ON(dev->id != NULL);
-		if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
-			dev->class = ATA_DEV_NONE;
-			continue;
-		}
+		rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
+		if (rc)
+			goto fail;
 
-		if (ata_dev_configure(ap, dev, 1)) {
-			ata_dev_disable(ap, dev);
-			continue;
-		}
-
-		found = 1;
+		rc = ata_dev_configure(dev, 1);
+		if (rc)
+			goto fail;
 	}
 
-	if (!found)
-		goto err_out_disable;
+	/* configure transfer mode */
+	rc = ata_set_mode(ap, &dev);
+	if (rc) {
+		down_xfermask = 1;
+		goto fail;
+	}
 
-	if (ap->ops->set_mode)
-		ap->ops->set_mode(ap);
-	else
-		ata_set_mode(ap);
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ata_dev_enabled(&ap->device[i]))
+			return 0;
 
-	if (ap->flags & ATA_FLAG_PORT_DISABLED)
-		goto err_out_disable;
-
-	return 0;
-
-err_out_disable:
+	/* no device present, disable port */
+	ata_port_disable(ap);
 	ap->ops->port_disable(ap);
-	return -1;
+	return -ENODEV;
+
+ fail:
+	switch (rc) {
+	case -EINVAL:
+	case -ENODEV:
+		tries[dev->devno] = 0;
+		break;
+	case -EIO:
+		sata_down_spd_limit(ap);
+		/* fall through */
+	default:
+		tries[dev->devno]--;
+		if (down_xfermask &&
+		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
+			tries[dev->devno] = 0;
+	}
+
+	if (!tries[dev->devno]) {
+		ata_down_xfermask_limit(dev, 1);
+		ata_dev_disable(dev);
+	}
+
+	goto retry;
 }
 
 /**
···
 
 void ata_port_probe(struct ata_port *ap)
 {
-	ap->flags &= ~ATA_FLAG_PORT_DISABLED;
+	ap->flags &= ~ATA_FLAG_DISABLED;
 }
 
 /**
···
  */
 static void sata_print_link_status(struct ata_port *ap)
 {
-	u32 sstatus, tmp;
-	const char *speed;
+	u32 sstatus, scontrol, tmp;
 
-	if (!ap->ops->scr_read)
+	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
 		return;
+	sata_scr_read(ap, SCR_CONTROL, &scontrol);
 
-	sstatus = scr_read(ap, SCR_STATUS);
-
-	if (sata_dev_present(ap)) {
+	if (ata_port_online(ap)) {
 		tmp = (sstatus >> 4) & 0xf;
-		if (tmp & (1 << 0))
-			speed = "1.5";
-		else if (tmp & (1 << 1))
-			speed = "3.0";
-		else
-			speed = "<unknown>";
-		printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
-		       ap->id, speed, sstatus);
+		ata_port_printk(ap, KERN_INFO,
+				"SATA link up %s (SStatus %X SControl %X)\n",
+				sata_spd_string(tmp), sstatus, scontrol);
 	} else {
-		printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
-		       ap->id, sstatus);
+		ata_port_printk(ap, KERN_INFO,
+				"SATA link down (SStatus %X SControl %X)\n",
+				sstatus, scontrol);
 	}
 }
 
···
 
 	if (ap->flags & ATA_FLAG_SATA_RESET) {
 		/* issue phy wake/reset */
-		scr_write_flush(ap, SCR_CONTROL, 0x301);
+		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
 		/* Couldn't find anything in SATA I/II specs, but
 		 * AHCI-1.1 10.4.2 says at least 1 ms. */
 		mdelay(1);
 	}
-	scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
+	/* phy wake/clear reset */
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
 
 	/* wait for phy to become ready, if necessary */
 	do {
 		msleep(200);
-		sstatus = scr_read(ap, SCR_STATUS);
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
 		if ((sstatus & 0xf) != 1)
 			break;
 	} while (time_before(jiffies, timeout));
···
 	sata_print_link_status(ap);
 
 	/* TODO: phy layer with polling, timeouts, etc. */
-	if (sata_dev_present(ap))
+	if (!ata_port_offline(ap))
 		ata_port_probe(ap);
 	else
 		ata_port_disable(ap);
 
-	if (ap->flags & ATA_FLAG_PORT_DISABLED)
+	if (ap->flags & ATA_FLAG_DISABLED)
 		return;
 
 	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
···
 void sata_phy_reset(struct ata_port *ap)
 {
 	__sata_phy_reset(ap);
-	if (ap->flags & ATA_FLAG_PORT_DISABLED)
+	if (ap->flags & ATA_FLAG_DISABLED)
 		return;
 	ata_bus_reset(ap);
 }
 
 /**
  *	ata_dev_pair		-	return other device on cable
- *	@ap: port
  *	@adev: device
  *
  *	Obtain the other device on the same cable, or if none is
  *	present NULL is returned
  */
 
-struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
+struct ata_device *ata_dev_pair(struct ata_device *adev)
 {
+	struct ata_port *ap = adev->ap;
 	struct ata_device *pair = &ap->device[1 - adev->devno];
-	if (!ata_dev_present(pair))
+	if (!ata_dev_enabled(pair))
 		return NULL;
 	return pair;
 }
···
 {
 	ap->device[0].class = ATA_DEV_NONE;
 	ap->device[1].class = ATA_DEV_NONE;
-	ap->flags |= ATA_FLAG_PORT_DISABLED;
+	ap->flags |= ATA_FLAG_DISABLED;
+}
+
+/**
+ *	sata_down_spd_limit - adjust SATA spd limit downward
+ *	@ap: Port to adjust SATA spd limit for
+ *
+ *	Adjust SATA spd limit of @ap downward.  Note that this
+ *	function only adjusts the limit.  The change must be applied
+ *	using sata_set_spd().
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure
+ */
+int sata_down_spd_limit(struct ata_port *ap)
+{
+	u32 sstatus, spd, mask;
+	int rc, highbit;
+
+	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
+	if (rc)
+		return rc;
+
+	mask = ap->sata_spd_limit;
+	if (mask <= 1)
+		return -EINVAL;
+	highbit = fls(mask) - 1;
+	mask &= ~(1 << highbit);
+
+	spd = (sstatus >> 4) & 0xf;
+	if (spd <= 1)
+		return -EINVAL;
+	spd--;
+	mask &= (1 << spd) - 1;
+	if (!mask)
+		return -EINVAL;
+
+	ap->sata_spd_limit = mask;
+
+	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
+			sata_spd_string(fls(mask)));
+
+	return 0;
+}
+
+static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
+{
+	u32 spd, limit;
+
+	if (ap->sata_spd_limit == UINT_MAX)
+		limit = 0;
+	else
+		limit = fls(ap->sata_spd_limit);
+
+	spd = (*scontrol >> 4) & 0xf;
+	*scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
+
+	return spd != limit;
+}
+
+/**
+ *	sata_set_spd_needed - is SATA spd configuration needed
+ *	@ap: Port in question
+ *
+ *	Test whether the spd limit in SControl matches
+ *	@ap->sata_spd_limit.  This function is used to determine
+ *	whether hardreset is necessary to apply SATA spd
+ *	configuration.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if SATA spd configuration is needed, 0 otherwise.
+ */
+int sata_set_spd_needed(struct ata_port *ap)
+{
+	u32 scontrol;
+
+	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
+		return 0;
+
+	return __sata_set_spd_needed(ap, &scontrol);
+}
+
+/**
+ *	sata_set_spd - set SATA spd according to spd limit
+ *	@ap: Port to set SATA spd for
+ *
+ *	Set SATA spd of @ap according to sata_spd_limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 if spd doesn't need to be changed, 1 if spd has been
+ *	changed.  Negative errno if SCR registers are inaccessible.
+ */
+int sata_set_spd(struct ata_port *ap)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	if (!__sata_set_spd_needed(ap, &scontrol))
+		return 0;
+
+	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	return 1;
 }
 
 /*
···
 	return 0;
 }
 
-static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
+/**
+ *	ata_down_xfermask_limit - adjust dev xfer masks downward
+ *	@dev: Device to adjust xfer masks
+ *	@force_pio0: Force PIO0
+ *
+ *	Adjust xfer masks of @dev downward.  Note that this function
+ *	does not apply the change.  Invoking ata_set_mode() afterwards
+ *	will apply the limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure
+ */
+int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
+{
+	unsigned long xfer_mask;
+	int highbit;
+
+	xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
+				      dev->udma_mask);
+
+	if (!xfer_mask)
+		goto fail;
+	/* don't gear down to MWDMA from UDMA, go directly to PIO */
+	if (xfer_mask & ATA_MASK_UDMA)
+		xfer_mask &= ~ATA_MASK_MWDMA;
+
+	highbit = fls(xfer_mask) - 1;
+	xfer_mask &= ~(1 << highbit);
+	if (force_pio0)
+		xfer_mask &= 1 << ATA_SHIFT_PIO;
+	if (!xfer_mask)
+		goto fail;
+
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
+			    &dev->udma_mask);
+
+	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
+		       ata_mode_string(xfer_mask));
+
+	return 0;
+
+ fail:
+	return -EINVAL;
+}
+
+static int ata_dev_set_mode(struct ata_device *dev)
 {
 	unsigned int err_mask;
 	int rc;
 
+	dev->flags &= ~ATA_DFLAG_PIO;
 	if (dev->xfer_shift == ATA_SHIFT_PIO)
 		dev->flags |= ATA_DFLAG_PIO;
 
-	err_mask = ata_dev_set_xfermode(ap, dev);
+	err_mask = ata_dev_set_xfermode(dev);
 	if (err_mask) {
-		printk(KERN_ERR
-		       "ata%u: failed to set xfermode (err_mask=0x%x)\n",
-		       ap->id, err_mask);
+		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
+			       "(err_mask=0x%x)\n", err_mask);
 		return -EIO;
 	}
 
-	rc = ata_dev_revalidate(ap, dev, 0);
-	if (rc) {
-		printk(KERN_ERR
-		       "ata%u: failed to revalidate after set xfermode\n",
-		       ap->id);
+	rc = ata_dev_revalidate(dev, 0);
+	if (rc)
 		return rc;
-	}
 
 	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
 		dev->xfer_shift, (int)dev->xfer_mode);
 
-	printk(KERN_INFO "ata%u: dev %u configured for %s\n",
-	       ap->id, dev->devno,
-	       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
+	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
+		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
 	return 0;
 }
 
-static int ata_host_set_pio(struct ata_port *ap)
+/**
+ *	ata_set_mode - Program timings and issue SET FEATURES - XFER
+ *	@ap: port on which timings will be programmed
+ *	@r_failed_dev: out paramter for failed device
+ *
+ *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
+ *	ata_set_mode() fails, pointer to the failing device is
+ *	returned in @r_failed_dev.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno otherwise
+ */
+int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 {
-	int i;
+	struct ata_device *dev;
+	int i, rc = 0, used_dma = 0, found = 0;
 
+	/* has private set_mode? */
+	if (ap->ops->set_mode) {
+		/* FIXME: make ->set_mode handle no device case and
+		 * return error code and failing device on failure.
+		 */
+		for (i = 0; i < ATA_MAX_DEVICES; i++) {
+			if (ata_dev_enabled(&ap->device[i])) {
+				ap->ops->set_mode(ap);
+				break;
+			}
+		}
+		return 0;
+	}
+
+	/* step 1: calculate xfer_mask */
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
-		struct ata_device *dev = &ap->device[i];
+		unsigned int pio_mask, dma_mask;
 
-		if (!ata_dev_present(dev))
+		dev = &ap->device[i];
+
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		ata_dev_xfermask(dev);
+
+		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
+		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
+		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
+		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
+
+		found = 1;
+		if (dev->dma_mode)
+			used_dma = 1;
+	}
+	if (!found)
+		goto out;
+
+	/* step 2: always set host PIO timings */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+		if (!ata_dev_enabled(dev))
 			continue;
 
 		if (!dev->pio_mode) {
-			printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
-			return -1;
+			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
+			rc = -EINVAL;
+			goto out;
 		}
 
 		dev->xfer_mode = dev->pio_mode;
···
 			ap->ops->set_piomode(ap, dev);
 	}
 
-	return 0;
-}
-
-static void ata_host_set_dma(struct ata_port *ap)
-{
-	int i;
-
+	/* step 3: set host DMA timings */
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
-		struct ata_device *dev = &ap->device[i];
+		dev = &ap->device[i];
 
-		if (!ata_dev_present(dev) || !dev->dma_mode)
+		if (!ata_dev_enabled(dev) || !dev->dma_mode)
 			continue;
 
 		dev->xfer_mode = dev->dma_mode;
···
 		if (ap->ops->set_dmamode)
 			ap->ops->set_dmamode(ap, dev);
 	}
-}
-
-/**
- *	ata_set_mode - Program timings and issue SET FEATURES - XFER
- *	@ap: port on which timings will be programmed
- *
- *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
- *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- */
-static void ata_set_mode(struct ata_port *ap)
-{
-	int i, rc, used_dma = 0;
-
-	/* step 1: calculate xfer_mask */
-	for (i = 0; i < ATA_MAX_DEVICES; i++) {
-		struct ata_device *dev = &ap->device[i];
-		unsigned int pio_mask, dma_mask;
-
-		if (!ata_dev_present(dev))
-			continue;
-
-		ata_dev_xfermask(ap, dev);
-
-		/* TODO: let LLDD filter dev->*_mask here */
-
-		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
-		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
-		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
-		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
-
-		if (dev->dma_mode)
-			used_dma = 1;
-	}
-
-	/* step 2: always set host PIO timings */
-	rc = ata_host_set_pio(ap);
-	if (rc)
-		goto err_out;
-
-	/* step 3: set host DMA timings */
-	ata_host_set_dma(ap);
 
 	/* step 4: update devices' xfer mode */
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
-		struct ata_device *dev = &ap->device[i];
+		dev = &ap->device[i];
 
-		if (!ata_dev_present(dev))
+		if (!ata_dev_enabled(dev))
 			continue;
 
-		if (ata_dev_set_mode(ap, dev))
-			goto err_out;
+		rc = ata_dev_set_mode(dev);
+		if (rc)
+			goto out;
 	}
 
-	/*
-	 *	Record simplex status. If we selected DMA then the other
-	 *	host channels are not permitted to do so.
+	/* Record simplex status. If we selected DMA then the other
+	 * host channels are not permitted to do so.
 	 */
-
 	if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
 		ap->host_set->simplex_claimed = 1;
 
-	/*
-	 *	Chip specific finalisation
-	 */
+	/* step5: chip specific finalisation */
 	if (ap->ops->post_set_mode)
 		ap->ops->post_set_mode(ap);
 
-	return;
-
-err_out:
-	ata_port_disable(ap);
+ out:
+	if (rc)
+		*r_failed_dev = dev;
+	return rc;
 }
 
 /**
···
 	}
 
 	if (status & ATA_BUSY)
-		printk(KERN_WARNING "ata%u is slow to respond, "
-		       "please be patient\n", ap->id);
+		ata_port_printk(ap, KERN_WARNING,
+				"port is slow to respond, please be patient\n");
 
 	timeout = timer_start + tmout;
 	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
···
 	}
 
 	if (status & ATA_BUSY) {
-		printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
-		       ap->id, tmout / HZ);
+		ata_port_printk(ap, KERN_ERR, "port failed to respond "
+				"(%lu secs)\n", tmout / HZ);
 		return 1;
 	}
 
···
 	 * the bus shows 0xFF because the odd clown forgets the D7
 	 * pulldown resistor.
 	 */
-	if (ata_check_status(ap) == 0xFF)
+	if (ata_check_status(ap) == 0xFF) {
+		ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
 		return AC_ERR_OTHER;
+	}
 
 	ata_bus_post_reset(ap, devmask);
 
···
  *	Obtains host_set lock.
  *
  *	SIDE EFFECTS:
- *	Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
+ *	Sets ATA_FLAG_DISABLED if bus reset fails.
  */
 
 void ata_bus_reset(struct ata_port *ap)
···
 	return;
 
 err_out:
-	printk(KERN_ERR "ata%u: disabling port\n", ap->id);
+	ata_port_printk(ap, KERN_ERR, "disabling port\n");
 	ap->ops->port_disable(ap);
 
 	DPRINTK("EXIT\n");
 }
 
-static int sata_phy_resume(struct ata_port *ap)
-{
-	unsigned long timeout = jiffies + (HZ * 5);
-	u32 sstatus;
-
-	scr_write_flush(ap, SCR_CONTROL, 0x300);
-
-	/* Wait for phy to become ready, if necessary. */
-	do {
-		msleep(200);
-		sstatus = scr_read(ap, SCR_STATUS);
-		if ((sstatus & 0xf) != 1)
-			return 0;
-	} while (time_before(jiffies, timeout));
-
-	return -1;
-}
-
 /**
- *	ata_std_probeinit - initialize probing
- *	@ap: port to be probed
+ *	sata_phy_debounce - debounce SATA phy status
+ *	@ap: ATA port to debounce SATA phy status for
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
  *
- *	@ap is about to be probed.  Initialize it.  This function is
- *	to be used as standard callback for ata_drive_probe_reset().
+ *	Make sure SStatus of @ap reaches stable state, determined by
+ *	holding the same value where DET is not 1 for @duration polled
+ *	every @interval, before @timeout.  Timeout constraints the
+ *	beginning of the stable state.  Because, after hot unplugging,
+ *	DET gets stuck at 1 on some controllers, this functions waits
+ *	until timeout then returns 0 if DET is stable at 1.
  *
- *	NOTE!!! Do not use this function as probeinit if a low level
- *	driver implements only hardreset.  Just pass NULL as probeinit
- *	in that case.  Using this function is probably okay but doing
- *	so makes reset sequence different from the original
- *	->phy_reset implementation and Jeff nervous.  :-P
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
  */
-void ata_std_probeinit(struct ata_port *ap)
+int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
 {
-	if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
-		sata_phy_resume(ap);
-		if (sata_dev_present(ap))
-			ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+	unsigned long interval_msec = params[0];
+	unsigned long duration = params[1] * HZ / 1000;
+	unsigned long timeout = jiffies + params[2] * HZ / 1000;
+	unsigned long last_jiffies;
+	u32 last, cur;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+		return rc;
+	cur &= 0xf;
+
+	last = cur;
+	last_jiffies = jiffies;
+
+	while (1) {
+		msleep(interval_msec);
+		if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+			return rc;
+		cur &= 0xf;
+
+		/* DET stable? */
+		if (cur == last) {
+			if (cur == 1 && time_before(jiffies, timeout))
+				continue;
+			if (time_after(jiffies, last_jiffies + duration))
+				return 0;
+			continue;
+		}
+
+		/* unstable, start over */
+		last = cur;
+		last_jiffies = jiffies;
+
+		/* check timeout */
+		if (time_after(jiffies, timeout))
+			return -EBUSY;
 	}
 }
 
 /**
- *	ata_std_softreset - reset host port via ATA SRST
- *	@ap: port to reset
- *	@verbose: fail verbosely
- *	@classes: resulting classes of attached devices
+ *	sata_phy_resume - resume SATA phy
+ *	@ap: ATA port to resume SATA phy for
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
  *
- *	Reset host port using ATA SRST.  This function is to be used
- *	as standard callback for ata_drive_*_reset() functions.
+ *	Resume SATA phy of @ap and debounce it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	scontrol = (scontrol & 0x0f0) | 0x300;
+
+	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	/* Some PHYs react badly if SStatus is pounded immediately
+	 * after resuming.  Delay 200ms before debouncing.
+	 */
+	msleep(200);
+
+	return sata_phy_debounce(ap, params);
+}
+
+static void ata_wait_spinup(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned long end, secs;
+	int rc;
+
+	/* first, debounce phy if SATA */
+	if (ap->cbl == ATA_CBL_SATA) {
+		rc = sata_phy_debounce(ap, sata_deb_timing_eh);
+
+		/* if debounced successfully and offline, no need to wait */
+		if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
+			return;
+	}
+
+	/* okay, let's give the drive time to spin up */
+	end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
+	secs = ((end - jiffies) + HZ - 1) / HZ;
+
+	if (time_after(jiffies, end))
+		return;
+
+	if (secs > 5)
+		ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
+				"(%lu secs)\n", secs);
+
+	schedule_timeout_uninterruptible(end - jiffies);
+}
+
+/**
+ *	ata_std_prereset - prepare for reset
+ *	@ap: ATA port to be reset
+ *
+ *	@ap is about to be reset.  Initialize it.
  *
  *	LOCKING:
  *	Kernel thread context (may sleep)
···
  *	RETURNS:
  *	0 on success, -errno otherwise.
  */
-int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
+int ata_std_prereset(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	const unsigned long *timing;
+	int rc;
+
+	/* hotplug? */
+	if (ehc->i.flags & ATA_EHI_HOTPLUGGED) {
+		if (ap->flags & ATA_FLAG_HRST_TO_RESUME)
+			ehc->i.action |= ATA_EH_HARDRESET;
+		if (ap->flags & ATA_FLAG_SKIP_D2H_BSY)
+			ata_wait_spinup(ap);
+	}
+
+	/* if we're about to do hardreset, nothing more to do */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		return 0;
+
+	/* if SATA, resume phy */
+	if (ap->cbl == ATA_CBL_SATA) {
+		if (ap->flags & ATA_FLAG_LOADING)
+			timing = sata_deb_timing_boot;
+		else
+			timing = sata_deb_timing_eh;
+
+		rc = sata_phy_resume(ap, timing);
+		if (rc && rc != -EOPNOTSUPP) {
+			/* phy resume failed */
+			ata_port_printk(ap, KERN_WARNING, "failed to resume "
+					"link for reset (errno=%d)\n", rc);
+			return rc;
+		}
+	}
+
+	/* Wait for !BSY if the controller can wait for the first D2H
+	 * Reg FIS and we don't know that no device is attached.
+	 */
+	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
+		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	return 0;
+}
+
+/**
+ *	ata_std_softreset - reset host port via ATA SRST
+ *	@ap: port to reset
+ *	@classes: resulting classes of attached devices
+ *
+ *	Reset host port using ATA SRST.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
 {
 	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
 	unsigned int devmask = 0, err_mask;
···
 
 	DPRINTK("ENTER\n");
 
-	if (ap->ops->scr_read && !sata_dev_present(ap)) {
+	if (ata_port_offline(ap)) {
 		classes[0] = ATA_DEV_NONE;
 		goto out;
 	}
···
 	DPRINTK("about to softreset, devmask=%x\n", devmask);
 	err_mask = ata_bus_softreset(ap, devmask);
 	if (err_mask) {
-		if (verbose)
-			printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
-			       ap->id, err_mask);
-		else
-			DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
+		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
 				err_mask);
 		return -EIO;
 	}
···
 /**
  *	sata_std_hardreset - reset host port via SATA phy reset
  *	@ap: port to reset
- *	@verbose: fail verbosely
  *	@class: resulting class of attached device
  *
  *	SATA phy-reset host port using DET bits of SControl register.
- *	This function is to be used as standard callback for
- *	ata_drive_*_reset().
  *
  *	LOCKING:
  *	Kernel thread context (may sleep)
···
  *	RETURNS:
  *	0 on success, -errno otherwise.
  */
-int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
+int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
 {
+	u32 scontrol;
+	int rc;
+
 	DPRINTK("ENTER\n");
 
-	/* Issue phy wake/reset */
-	scr_write_flush(ap, SCR_CONTROL, 0x301);
+	if (sata_set_spd_needed(ap)) {
+		/* SATA spec says nothing about how to reconfigure
+		 * spd.  To be on the safe side, turn off phy during
+		 * reconfiguration.  This works for at least ICH7 AHCI
+		 * and Sil3124.
+		 */
+		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+			return rc;
 
-	/*
-	 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
+		scontrol = (scontrol & 0x0f0) | 0x302;
+
+		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+			return rc;
+
+		sata_set_spd(ap);
+	}
+
+	/* issue phy wake/reset */
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	scontrol = (scontrol & 0x0f0) | 0x301;
+
+	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
 	 * 10.4.2 says at least 1 ms.
 	 */
 	msleep(1);
 
-	/* Bring phy back */
-	sata_phy_resume(ap);
+	/* bring phy back */
+	sata_phy_resume(ap, sata_deb_timing_eh);
 
 	/* TODO: phy layer with polling, timeouts, etc. */
-	if (!sata_dev_present(ap)) {
+	if (ata_port_offline(ap)) {
 		*class = ATA_DEV_NONE;
 		DPRINTK("EXIT, link offline\n");
 		return 0;
 	}
 
 	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
-		if (verbose)
-			printk(KERN_ERR "ata%u: COMRESET failed "
-			       "(device not ready)\n", ap->id);
-		else
-			DPRINTK("EXIT, device not ready\n");
+		ata_port_printk(ap, KERN_ERR,
+				"COMRESET failed (device not ready)\n");
 		return -EIO;
 	}
 
···
  *	the device might have been reset more than once using
  *	different reset methods before postreset is invoked.
  *
- *	This function is to be used as standard callback for
- *	ata_drive_*_reset().
- *
  *	LOCKING:
  *	Kernel thread context (may sleep)
  */
 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
 {
+	u32 serror;
+
 	DPRINTK("ENTER\n");
 
-	/* set cable type if it isn't already set */
-	if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
-		ap->cbl = ATA_CBL_SATA;
-
 	/* print link status */
-	if (ap->cbl == ATA_CBL_SATA)
-		sata_print_link_status(ap);
+	sata_print_link_status(ap);
+
+	/* clear SError */
+	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
+		sata_scr_write(ap, SCR_ERROR, serror);
 
 	/* re-enable interrupts */
-	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
-		ata_irq_on(ap);
+	if (!ap->ops->error_handler) {
+		/* FIXME: hack. create a hook instead */
+		if (ap->ioaddr.ctl_addr)
+			ata_irq_on(ap);
+	}
 
 	/* is double-select really necessary? */
 	if (classes[0] != ATA_DEV_NONE)
···
 }
 
 /**
- *	ata_std_probe_reset - standard probe reset method
- *	@ap: prot to perform probe-reset
- *	@classes: resulting classes of attached devices
- *
- *	The stock off-the-shelf ->probe_reset method.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	0 on success, -errno otherwise.
- */
-int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
-	ata_reset_fn_t hardreset;
-
-	hardreset = NULL;
-	if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
-		hardreset = sata_std_hardreset;
-
-	return ata_drive_probe_reset(ap, ata_std_probeinit,
-				     ata_std_softreset, hardreset,
-				     ata_std_postreset, classes);
-}
-
-static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
-			  ata_postreset_fn_t postreset,
-			  unsigned int *classes)
-{
-	int i, rc;
-
-	for (i = 0; i < ATA_MAX_DEVICES; i++)
-		classes[i] = ATA_DEV_UNKNOWN;
-
-	rc = reset(ap, 0, classes);
-	if (rc)
-		return rc;
-
-	/* If any class isn't ATA_DEV_UNKNOWN, consider classification
-	 * is complete and convert all ATA_DEV_UNKNOWN to
-	 * ATA_DEV_NONE.
-	 */
-	for (i = 0; i < ATA_MAX_DEVICES; i++)
-		if (classes[i] != ATA_DEV_UNKNOWN)
-			break;
-
-	if (i < ATA_MAX_DEVICES)
-		for (i = 0; i < ATA_MAX_DEVICES; i++)
-			if (classes[i] == ATA_DEV_UNKNOWN)
-				classes[i] = ATA_DEV_NONE;
-
-	if (postreset)
-		postreset(ap, classes);
-
-	return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
-}
-
-/**
- *	ata_drive_probe_reset - Perform probe reset with given methods
- *	@ap: port to reset
- *	@probeinit: probeinit method (can be NULL)
- *	@softreset: softreset method (can be NULL)
- *	@hardreset: hardreset method (can be NULL)
- *	@postreset: postreset method (can be NULL)
- *	@classes: resulting classes of attached devices
- *
- *	Reset the specified port and classify attached devices using
- *	given methods.  This function prefers softreset but tries all
- *	possible reset sequences to reset and classify devices.  This
- *	function is intended to be used for constructing ->probe_reset
- *	callback by low level drivers.
- *
- *	Reset methods should follow the following rules.
- *
- *	- Return 0 on sucess, -errno on failure.
- *	- If classification is supported, fill classes[] with
- *	  recognized class codes.
- *	- If classification is not supported, leave classes[] alone.
- *	- If verbose is non-zero, print error message on failure;
- *	  otherwise, shut up.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	0 on success, -EINVAL if no reset method is avaliable, -ENODEV
- *	if classification fails, and any error code from reset
- *	methods.
- */
-int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
-			  ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
-			  ata_postreset_fn_t postreset, unsigned int *classes)
-{
-	int rc = -EINVAL;
-
-	if (probeinit)
-		probeinit(ap);
-
-	if (softreset) {
-		rc = do_probe_reset(ap, softreset, postreset, classes);
-		if (rc == 0)
-			return 0;
-	}
-
-	if (!hardreset)
-		return rc;
-
-	rc = do_probe_reset(ap, hardreset, postreset, classes);
-	if (rc == 0 || rc != -ENODEV)
-		return rc;
-
-	if (softreset)
-		rc = do_probe_reset(ap, softreset, postreset, classes);
-
-	return rc;
-}
-
-/**
  *	ata_dev_same_device - Determine whether new ID matches configured device
- *	@ap: port on which the device to compare against resides
  *	@dev: device to compare against
  *	@new_class: class of the new device
  *	@new_id: IDENTIFY page of the new device
···
  *	RETURNS:
  *	1 if @dev matches @new_class and @new_id, 0 otherwise.
  */
-static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
-			       unsigned int new_class, const u16 *new_id)
+static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
+			       const u16 *new_id)
 {
 	const u16 *old_id = dev->id;
 	unsigned char model[2][41], serial[2][21];
 	u64 new_n_sectors;
 
 	if (dev->class != new_class) {
-		printk(KERN_INFO
-		       "ata%u: dev %u class mismatch %d != %d\n",
-		       ap->id, dev->devno, dev->class, new_class);
+		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
+			       dev->class, new_class);
 		return 0;
 	}
 
···
 	new_n_sectors = ata_id_n_sectors(new_id);
 
 	if (strcmp(model[0], model[1])) {
-		printk(KERN_INFO
-		       "ata%u: dev %u model number mismatch '%s' != '%s'\n",
-		       ap->id, dev->devno, model[0], model[1]);
+		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
+			       "'%s' != '%s'\n", model[0], model[1]);
 		return 0;
 	}
 
 	if (strcmp(serial[0], serial[1])) {
-		printk(KERN_INFO
-		       "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
-		       ap->id, dev->devno, serial[0], serial[1]);
+		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
+			       "'%s' != '%s'\n", serial[0], serial[1]);
 		return 0;
 	}
 
 	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
-		printk(KERN_INFO
-		       "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
-		       ap->id, dev->devno, (unsigned long long)dev->n_sectors,
-		       (unsigned long long)new_n_sectors);
+		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
+			       "%llu != %llu\n",
+			       (unsigned long long)dev->n_sectors,
+			       (unsigned long long)new_n_sectors);
 		return 0;
 	}
 
···
 
 /**
  *	ata_dev_revalidate - Revalidate ATA device
- *	@ap: port on which the device to revalidate resides
  *	@dev: device to revalidate
  *	@post_reset: is this revalidation after reset?
  *
···
  *	RETURNS:
  *	0 on success, negative errno otherwise
  */
-int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
-		       int post_reset)
+int ata_dev_revalidate(struct ata_device *dev, int post_reset)
 {
-	unsigned int class;
-	u16 *id;
+	unsigned int class = dev->class;
+	u16 *id = (void *)dev->ap->sector_buf;
 	int rc;
 
-	if (!ata_dev_present(dev))
-		return -ENODEV;
-
-	class = dev->class;
-	id = NULL;
-
-	/* allocate & read ID data */
-	rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
-	if (rc)
-		goto fail;
-
-	/* is the device still there? */
-	if (!ata_dev_same_device(ap, dev, class, id)) {
+	if (!ata_dev_enabled(dev)) {
 		rc = -ENODEV;
 		goto fail;
 	}
 
-	kfree(dev->id);
-	dev->id = id;
+	/* read ID data */
+	rc = ata_dev_read_id(dev, &class, post_reset, id);
+	if (rc)
+		goto fail;
+
+	/* is the device still there? */
+	if (!ata_dev_same_device(dev, class, id)) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
 
 	/* configure device according to the new ID */
-	return ata_dev_configure(ap, dev, 0);
+	rc = ata_dev_configure(dev, 0);
+	if (rc == 0)
+		return 0;
 
  fail:
-	printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
-	       ap->id, dev->devno, rc);
-	kfree(id);
+	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
 	return rc;
 }
 
···
 	unsigned int nlen, rlen;
 	int i;
 
+	/* We don't support polling DMA.
+	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
+	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
+	 */
+	if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
+	    (dev->flags & ATA_DFLAG_CDB_INTR))
+		return 1;
+
 	ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
 			  sizeof(model_num));
 	ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
···
 
 /**
  *	ata_dev_xfermask - Compute supported xfermask of the given device
- *	@ap: Port on which the device to compute xfermask for resides
  *	@dev: Device to compute xfermask for
  *
  *	Compute supported xfermask of @dev and store it in
···
  *	LOCKING:
  *	None.
  */
-static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
+static void ata_dev_xfermask(struct ata_device *dev)
 {
+	struct ata_port *ap = dev->ap;
 	struct ata_host_set *hs = ap->host_set;
 	unsigned long xfer_mask;
 	int i;
 
-	xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
-				      ap->udma_mask);
+	xfer_mask = ata_pack_xfermask(ap->pio_mask,
+				      ap->mwdma_mask, ap->udma_mask);
+
+	/* Apply cable rule here.  Don't apply it early because when
+	 * we handle hot plug the cable type can itself change.
+	 */
+	if (ap->cbl == ATA_CBL_PATA40)
+		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
 
 	/* FIXME: Use port-wide xfermask for now */
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
 		struct ata_device *d = &ap->device[i];
-		if (!ata_dev_present(d))
+
+		if (ata_dev_absent(d))
 			continue;
-		xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
-					       d->udma_mask);
+
+		if (ata_dev_disabled(d)) {
+			/* to avoid violating device selection timing */
+			xfer_mask &= ata_pack_xfermask(d->pio_mask,
+						       UINT_MAX, UINT_MAX);
+			continue;
+		}
+
+		xfer_mask &= ata_pack_xfermask(d->pio_mask,
+					       d->mwdma_mask, d->udma_mask);
 		xfer_mask &= ata_id_xfermask(d->id);
 		if (ata_dma_blacklisted(d))
 			xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
-		/* Apply cable rule here. Don't apply it early because when
-		   we handle hot plug the cable type can itself change */
-		if (ap->cbl == ATA_CBL_PATA40)
-			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
 	}
 
 	if (ata_dma_blacklisted(dev))
-		printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
-		       "disabling DMA\n", ap->id, dev->devno);
+		ata_dev_printk(dev, KERN_WARNING,
+			       "device is on DMA blacklist, disabling DMA\n");
 
 	if (hs->flags & ATA_HOST_SIMPLEX) {
 		if (hs->simplex_claimed)
 			xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
 	}
+
 	if (ap->ops->mode_filter)
 		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
 
-	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
-			    &dev->udma_mask);
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
+			    &dev->mwdma_mask, &dev->udma_mask);
 }
 
 /**
  *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
- *	@ap: Port associated with device @dev
  *	@dev: Device to which command will be sent
  *
  *	Issue SET FEATURES - XFER MODE command to device @dev
···
  *	0 on success, AC_ERR_* mask otherwise.
  */
 
-static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
-					 struct ata_device *dev)
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
 {
 	struct ata_taskfile tf;
 	unsigned int err_mask;
···
 	/* set up set-features taskfile */
 	DPRINTK("set features - xfer mode\n");
 
-	ata_tf_init(ap, &tf, dev->devno);
+	ata_tf_init(dev, &tf);
 	tf.command = ATA_CMD_SET_FEATURES;
 	tf.feature = SETFEATURES_XFER;
 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 	tf.protocol = ATA_PROT_NODATA;
 	tf.nsect = dev->xfer_mode;
 
-	err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
 
 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
 	return err_mask;
···
 
 /**
  *	ata_dev_init_params - Issue INIT DEV PARAMS command
- *	@ap: Port associated with device @dev
  *	@dev: Device to which command will be sent
  *	@heads: Number of heads (taskfile parameter)
  *	@sectors: Number of sectors (taskfile parameter)
···
  *	RETURNS:
  *	0 on success, AC_ERR_* mask otherwise.
  */
-
-static unsigned int ata_dev_init_params(struct ata_port *ap,
-					struct ata_device *dev,
-					u16 heads,
-					u16 sectors)
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors)
 {
 	struct ata_taskfile tf;
 	unsigned int err_mask;
···
 	/* set up init dev params taskfile */
 	DPRINTK("init dev params \n");
 
-	ata_tf_init(ap, &tf, dev->devno);
+	ata_tf_init(dev, &tf);
 	tf.command = ATA_CMD_INIT_DEV_PARAMS;
 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 	tf.protocol = ATA_PROT_NODATA;
 	tf.nsect = sectors;
 	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
 
-	err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
 
 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
 	return err_mask;
···
 	qc->n_elem = 1;
 	qc->orig_n_elem = 1;
 	qc->buf_virt = buf;
+	qc->nbytes = buflen;
 
 	sg = qc->__sg;
 	sg_init_one(sg, buf, buflen);
···
 }
 
 /**
- *	ata_poll_qc_complete - turn irq back on and finish qc
- *	@qc: Command to complete
- *	@err_mask: ATA status register content
- *
- *	LOCKING:
- *	None.  (grabs host lock)
- */
-
-void ata_poll_qc_complete(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-	ap->flags &= ~ATA_FLAG_NOINTR;
-	ata_irq_on(ap);
-	ata_qc_complete(qc);
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
-}
-
-/**
- *	ata_pio_poll - poll using PIO, depending on current state
- *	@ap: the target ata_port
- *
- *	LOCKING:
- *	None.  (executing in kernel thread context)
- *
- *	RETURNS:
- *	timeout value to use
- */
-
-static unsigned long ata_pio_poll(struct ata_port *ap)
-{
-	struct ata_queued_cmd *qc;
-	u8 status;
-	unsigned int poll_state = HSM_ST_UNKNOWN;
-	unsigned int reg_state = HSM_ST_UNKNOWN;
-
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	WARN_ON(qc == NULL);
-
-	switch (ap->hsm_task_state) {
-	case HSM_ST:
-	case HSM_ST_POLL:
-		poll_state = HSM_ST_POLL;
-		reg_state = HSM_ST;
-		break;
-	case HSM_ST_LAST:
-	case HSM_ST_LAST_POLL:
-		poll_state = HSM_ST_LAST_POLL;
-		reg_state = HSM_ST_LAST;
-		break;
-	default:
-		BUG();
-		break;
-	}
-
-	status = ata_chk_status(ap);
-	if (status & ATA_BUSY) {
-		if (time_after(jiffies, ap->pio_task_timeout)) {
-			qc->err_mask |= AC_ERR_TIMEOUT;
-			ap->hsm_task_state = HSM_ST_TMOUT;
-			return 0;
-		}
-		ap->hsm_task_state = poll_state;
-		return ATA_SHORT_PAUSE;
-	}
-
-	ap->hsm_task_state = reg_state;
-	return 0;
-}
-
-/**
- *	ata_pio_complete - check if drive is busy or idle
- *	@ap: the target ata_port
- *
- *	LOCKING:
- *	None.  (executing in kernel thread context)
- *
- *	RETURNS:
- *	Non-zero if qc completed, zero otherwise.
- */
-
-static int ata_pio_complete (struct ata_port *ap)
-{
-	struct ata_queued_cmd *qc;
-	u8 drv_stat;
-
-	/*
-	 * This is purely heuristic.  This is a fast path.  Sometimes when
-	 * we enter, BSY will be cleared in a chk-status or two.  If not,
-	 * the drive is probably seeking or something.  Snooze for a couple
-	 * msecs, then chk-status again.  If still busy, fall back to
-	 * HSM_ST_POLL state.
-	 */
-	drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
-	if (drv_stat & ATA_BUSY) {
-		msleep(2);
-		drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
-		if (drv_stat & ATA_BUSY) {
-			ap->hsm_task_state = HSM_ST_LAST_POLL;
-			ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
-			return 0;
-		}
-	}
-
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	WARN_ON(qc == NULL);
-
-	drv_stat = ata_wait_idle(ap);
-	if (!ata_ok(drv_stat)) {
-		qc->err_mask |= __ac_err_mask(drv_stat);
-		ap->hsm_task_state = HSM_ST_ERR;
-		return 0;
-	}
-
-	ap->hsm_task_state = HSM_ST_IDLE;
-
-	WARN_ON(qc->err_mask);
-	ata_poll_qc_complete(qc);
-
-	/* another command may start at this point */
-
-	return 1;
-}
-
-
-/**
  *	swap_buf_le16 - swap halves of 16-bit words in place
  *	@buf:  Buffer to swap
  *	@buf_words:  Number of 16-bit words in buffer.
···
 
 /**
  *	ata_mmio_data_xfer - Transfer data by MMIO
- *	@ap: port to read/write
+ *	@adev: device for this I/O
  *	@buf: data buffer
  *	@buflen: buffer length
  *	@write_data: read/write
···
  *	Inherited from caller.
  */
 
-static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
-			       unsigned int buflen, int write_data)
+void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, 
+			unsigned int buflen, int write_data)
 {
+	struct ata_port *ap = adev->ap;
 	unsigned int i;
 	unsigned int words = buflen >> 1;
 	u16 *buf16 = (u16 *) buf;
···
 
 /**
  *	ata_pio_data_xfer - Transfer data by PIO
- *	@ap: port to read/write
+ *	@adev: device to target
  *	@buf: data buffer
  *	@buflen: buffer length
  *	@write_data: read/write
···
  *	Inherited from caller.
  */
 
-static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
-			      unsigned int buflen, int write_data)
+void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf, 
+		       unsigned int buflen, int write_data)
 {
+	struct ata_port *ap = adev->ap;
 	unsigned int words = buflen >> 1;
 
 	/* Transfer multiple of 2 bytes */
···
 }
 
 /**
- *	ata_data_xfer - Transfer data from/to the data register.
- *	@ap: port to read/write
+ *	ata_pio_data_xfer_noirq - Transfer data by PIO
+ *	@adev: device to target
  *	@buf: data buffer
  *	@buflen: buffer length
- *	@do_write: read/write
+ *	@write_data: read/write
  *
- *	Transfer data from/to the device data register.
+ *	Transfer data from/to the device data register by PIO. Do the 
+ *	transfer with interrupts disabled.
  *
  *	LOCKING:
  *	Inherited from caller.
  */
 
-static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
-			  unsigned int buflen, int do_write)
+void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
+				    unsigned int buflen, int write_data)
 {
-	/* Make the crap hardware pay the costs not the good stuff */
-	if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
-		unsigned long flags;
-		local_irq_save(flags);
-		if (ap->flags & ATA_FLAG_MMIO)
-			ata_mmio_data_xfer(ap, buf, buflen, do_write);
-		else
-			ata_pio_data_xfer(ap, buf, buflen, do_write);
-		local_irq_restore(flags);
-	} else {
-		if (ap->flags & ATA_FLAG_MMIO)
-			ata_mmio_data_xfer(ap, buf, buflen, do_write);
-		else
-			ata_pio_data_xfer(ap, buf, buflen, do_write);
-	}
+	unsigned long flags;
+	local_irq_save(flags);
+	ata_pio_data_xfer(adev, buf, buflen, write_data);
+	local_irq_restore(flags);
 }
+
 
 /**
  *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
···
 	page = nth_page(page, (offset >> PAGE_SHIFT));
 	offset %= PAGE_SIZE;
 
-	buf = kmap(page) + offset;
+	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+	if (PageHighMem(page)) {
+		unsigned long flags;
+
+		/* FIXME: use a bounce buffer */
+		local_irq_save(flags);
+		buf = kmap_atomic(page, KM_IRQ0);
+
+		/* do the actual data transfer */
+		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
+
+		kunmap_atomic(buf, KM_IRQ0);
+		local_irq_restore(flags);
+	} else {
+		buf = page_address(page);
+		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
+	}
 
 	qc->cursect++;
 	qc->cursg_ofs++;
···
 		qc->cursg++;
 		qc->cursg_ofs = 0;
 	}
+}
 
-	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+/**
+ *	ata_pio_sectors - Transfer one or many 512-byte sectors.
+ *	@qc: Command on going
+ *
+ *	Transfer one or many ATA_SECT_SIZE of data from/to the
+ *	ATA device for the DRQ request.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
 
-	/* do the actual data transfer */
-	do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
-	ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
+static void ata_pio_sectors(struct ata_queued_cmd *qc)
+{
+	if (is_multi_taskfile(&qc->tf)) {
+		/* READ/WRITE MULTIPLE */
+		unsigned int nsect;
 
-	kunmap(page);
+		WARN_ON(qc->dev->multi_count == 0);
+
+		nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
+		while (nsect--)
+			ata_pio_sector(qc);
+	} else
+		ata_pio_sector(qc);
+}
+
+/**
+ *	atapi_send_cdb - Write CDB bytes to hardware
+ *	@ap: Port to which ATAPI device is attached.
+ *	@qc: Taskfile currently active
+ *
+ *	When device has indicated its readiness to accept
+ *	a CDB, this function is called.  Send the CDB.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
+{
+	/* send SCSI cdb */
+	DPRINTK("send cdb\n");
+	WARN_ON(qc->dev->cdb_len < 12);
+
+	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
+	ata_altstatus(ap); /* flush */
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_ATAPI:
+		ap->hsm_task_state = HSM_ST;
+		break;
+	case ATA_PROT_ATAPI_NODATA:
+		ap->hsm_task_state = HSM_ST_LAST;
+		break;
+	case ATA_PROT_ATAPI_DMA:
+		ap->hsm_task_state = HSM_ST_LAST;
+		/* initiate bmdma */
+		ap->ops->bmdma_start(qc);
+		break;
+	}
 }
 
 /**
···
 		unsigned int i;
 
 		if (words) /* warning if bytes > 1 */
-			printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
-			       ap->id, bytes);
+			ata_dev_printk(qc->dev, KERN_WARNING,
+				       "%u bytes trailing data\n", bytes);
 
 		for (i = 0; i < words; i++)
-			ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
+			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
 
 		ap->hsm_task_state = HSM_ST_LAST;
 		return;
···
 	/* don't cross page boundaries */
 	count = min(count, (unsigned int)PAGE_SIZE - offset);
 
-	buf = kmap(page) + offset;
+	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+	if (PageHighMem(page)) {
+		unsigned long flags;
+
+		/* FIXME: use bounce buffer */
+		local_irq_save(flags);
+		buf = kmap_atomic(page, KM_IRQ0);
+
+		/* do the actual data transfer */
+		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
+
+		kunmap_atomic(buf, KM_IRQ0);
+		local_irq_restore(flags);
+	} else {
+		buf = page_address(page);
+		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
+	}
 
 	bytes -= count;
 	qc->curbytes += count;
···
 		qc->cursg++;
 		qc->cursg_ofs = 0;
 	}
-
-	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
-
-	/* do the actual data transfer */
-	ata_data_xfer(ap, buf, count, do_write);
-
-	kunmap(page);
 
 	if (bytes)
 		goto next_sg;
···
 	unsigned int ireason, bc_lo, bc_hi, bytes;
 	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
 
-	ap->ops->tf_read(ap, &qc->tf);
-	ireason = qc->tf.nsect;
-	bc_lo = qc->tf.lbam;
-	bc_hi = qc->tf.lbah;
+	/* Abuse qc->result_tf for temp storage of intermediate TF
+	 * here to save some kernel stack usage.
+	 * For normal completion, qc->result_tf is not relevant. For
+	 * error, qc->result_tf is later overwritten by ata_qc_complete().
+	 * So, the correctness of qc->result_tf is not affected.
+	 */
+	ap->ops->tf_read(ap, &qc->result_tf);
+	ireason = qc->result_tf.nsect;
+	bc_lo = qc->result_tf.lbam;
+	bc_hi = qc->result_tf.lbah;
 	bytes = (bc_hi << 8) | bc_lo;
 
 	/* shall be cleared to zero, indicating xfer of data */
···
 	if (do_write != i_write)
 		goto err_out;
 
+	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
+
 	__atapi_pio_bytes(qc, bytes);
 
 	return;
 
 err_out:
-	printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
-	      ap->id, dev->devno);
+	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
 	qc->err_mask |= AC_ERR_HSM;
 	ap->hsm_task_state = HSM_ST_ERR;
 }
 
 /**
- *	ata_pio_block - start PIO on a block
+ *	ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
  *	@ap: the target ata_port
+ *	@qc: qc on going
  *
- *	LOCKING:
- *	None.  (executing in kernel thread context)
+ *	RETURNS:
+ *	1 if ok in workqueue, 0 otherwise.
  */
 
-static void ata_pio_block(struct ata_port *ap)
+static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
 {
-	struct ata_queued_cmd *qc;
+	if (qc->tf.flags & ATA_TFLAG_POLLING)
+		return 1;
+
+	if (ap->hsm_task_state == HSM_ST_FIRST) {
+		if (qc->tf.protocol == ATA_PROT_PIO &&
+		    (qc->tf.flags & ATA_TFLAG_WRITE))
+		    return 1;
+
+		if (is_atapi_taskfile(&qc->tf) &&
+		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			return 1;
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_hsm_qc_complete - finish a qc running on standard HSM
+ *	@qc: Command to complete
+ *	@in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ *	Finish @qc which is running on standard HSM.
+ *
+ *	LOCKING:
+ *	If @in_wq is zero, spin_lock_irqsave(host_set lock).
+ *	Otherwise, none on entry and grabs host lock.
+ */
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned long flags;
+
+	if (ap->ops->error_handler) {
+		if (in_wq) {
+			spin_lock_irqsave(ap->lock, flags);
+
+			/* EH might have kicked in while host_set lock
+			 * is released.
+			 */
+			qc = ata_qc_from_tag(ap, qc->tag);
+			if (qc) {
+				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
+					ata_irq_on(ap);
+					ata_qc_complete(qc);
+				} else
+					ata_port_freeze(ap);
+			}
+
+			spin_unlock_irqrestore(ap->lock, flags);
+		} else {
+			if (likely(!(qc->err_mask & AC_ERR_HSM)))
+				ata_qc_complete(qc);
+			else
+				ata_port_freeze(ap);
+		}
+	} else {
+		if (in_wq) {
+			spin_lock_irqsave(ap->lock, flags);
+			ata_irq_on(ap);
+			ata_qc_complete(qc);
+			spin_unlock_irqrestore(ap->lock, flags);
+		} else
+			ata_qc_complete(qc);
+	}
+
+	ata_altstatus(ap); /* flush */
+}
+
+/**
+ *	ata_hsm_move - move the HSM to the next state.
+ *	@ap: the target ata_port
+ *	@qc: qc on going
+ *	@status: current device status
+ *	@in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ *	RETURNS:
+ *	1 when poll next status needed, 0 otherwise.
+ */
+int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
+		 u8 status, int in_wq)
+{
+	unsigned long flags = 0;
+	int poll_next;
+
+	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
+
+	/* Make sure ata_qc_issue_prot() does not throw things
+	 * like DMA polling into the workqueue. Notice that
+	 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
+	 */
+	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
+
+fsm_start:
+	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
+		ap->id, qc->tf.protocol, ap->hsm_task_state, status);
+
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Send first data block or PACKET CDB */
+
+		/* If polling, we will stay in the work queue after
+		 * sending the data. Otherwise, interrupt handler
+		 * takes over after sending the data.
+		 */
+		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
+
+		/* check device status */
+		if (unlikely((status & ATA_DRQ) == 0)) {
+			/* handle BSY=0, DRQ=0 as error */
+			if (likely(status & (ATA_ERR | ATA_DF)))
+				/* device stops HSM for abort/error */
+				qc->err_mask |= AC_ERR_DEV;
+			else
+				/* HSM violation. Let EH handle this */
+				qc->err_mask |= AC_ERR_HSM;
+
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* Device should not ask for data transfer (DRQ=1)
+		 * when it finds something wrong.
+		 * We ignore DRQ here and stop the HSM by
+		 * changing hsm_task_state to HSM_ST_ERR and
+		 * let the EH abort the command or reset the device.
+		 */
+		if (unlikely(status & (ATA_ERR | ATA_DF))) {
+			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
+			       ap->id, status);
+			qc->err_mask |= AC_ERR_HSM;
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* Send the CDB (atapi) or the first data block (ata pio out).
+		 * During the state transition, interrupt handler shouldn't
+		 * be invoked before the data transfer is complete and
+		 * hsm_task_state is changed. Hence, the following locking.
+		 */
+		if (in_wq)
+			spin_lock_irqsave(ap->lock, flags);
+
+		if (qc->tf.protocol == ATA_PROT_PIO) {
+			/* PIO data out protocol.
+			 * send first data block.
+			 */
+
+			/* ata_pio_sectors() might change the state
+			 * to HSM_ST_LAST. so, the state is changed here
+			 * before ata_pio_sectors().
+			 */
+			ap->hsm_task_state = HSM_ST;
+			ata_pio_sectors(qc);
+			ata_altstatus(ap); /* flush */
+		} else
+			/* send CDB */
+			atapi_send_cdb(ap, qc);
+
+		if (in_wq)
+			spin_unlock_irqrestore(ap->lock, flags);
+
+		/* if polling, ata_pio_task() handles the rest.
+		 * otherwise, interrupt handler takes over from here.
+		 */
+		break;
+
+	case HSM_ST:
+		/* complete command or read/write the data register */
+		if (qc->tf.protocol == ATA_PROT_ATAPI) {
+			/* ATAPI PIO protocol */
+			if ((status & ATA_DRQ) == 0) {
+				/* No more data to transfer or device error.
+				 * Device error will be tagged in HSM_ST_LAST.
+				 */
+				ap->hsm_task_state = HSM_ST_LAST;
+				goto fsm_start;
+			}
+
+			/* Device should not ask for data transfer (DRQ=1)
+			 * when it finds something wrong.
+			 * We ignore DRQ here and stop the HSM by
+			 * changing hsm_task_state to HSM_ST_ERR and
+			 * let the EH abort the command or reset the device.
+			 */
+			if (unlikely(status & (ATA_ERR | ATA_DF))) {
+				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
+				       ap->id, status);
+				qc->err_mask |= AC_ERR_HSM;
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			atapi_pio_bytes(qc);
+
+			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
+				/* bad ireason reported by device */
+				goto fsm_start;
+
+		} else {
+			/* ATA PIO protocol */
+			if (unlikely((status & ATA_DRQ) == 0)) {
+				/* handle BSY=0, DRQ=0 as error */
+				if (likely(status & (ATA_ERR | ATA_DF)))
+					/* device stops HSM for abort/error */
+					qc->err_mask |= AC_ERR_DEV;
+				else
+					/* HSM violation. Let EH handle this */
+					qc->err_mask |= AC_ERR_HSM;
+
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			/* For PIO reads, some devices may ask for
+			 * data transfer (DRQ=1) alone with ERR=1.
+			 * We respect DRQ here and transfer one
+			 * block of junk data before changing the
+			 * hsm_task_state to HSM_ST_ERR.
+			 *
+			 * For PIO writes, ERR=1 DRQ=1 doesn't make
+			 * sense since the data block has been
+			 * transferred to the device.
+			 */
+			if (unlikely(status & (ATA_ERR | ATA_DF))) {
+				/* data might be corrputed */
+				qc->err_mask |= AC_ERR_DEV;
+
+				if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
+					ata_pio_sectors(qc);
+					ata_altstatus(ap);
+					status = ata_wait_idle(ap);
+				}
+
+				if (status & (ATA_BUSY | ATA_DRQ))
+					qc->err_mask |= AC_ERR_HSM;
+
+				/* ata_pio_sectors() might change the
+				 * state to HSM_ST_LAST. so, the state
+				 * is changed after ata_pio_sectors().
+				 */
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			ata_pio_sectors(qc);
+
+			if (ap->hsm_task_state == HSM_ST_LAST &&
+			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+				/* all data read */
+				ata_altstatus(ap);
+				status = ata_wait_idle(ap);
+				goto fsm_start;
+			}
+		}
+
+		ata_altstatus(ap); /* flush */
+		poll_next = 1;
+		break;
+
+	case HSM_ST_LAST:
+		if (unlikely(!ata_ok(status))) {
+			qc->err_mask |= __ac_err_mask(status);
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* no more data to transfer */
+		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
+			ap->id, qc->dev->devno, status);
+
+		WARN_ON(qc->err_mask);
+
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		/* complete taskfile transaction */
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+
+	case HSM_ST_ERR:
+		/* make sure qc->err_mask is available to
+		 * know what's wrong and recover
+		 */
+		WARN_ON(qc->err_mask == 0);
+
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		/* complete taskfile transaction */
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+	default:
+		poll_next = 0;
+		BUG();
+	}
+
+	return poll_next;
+}
+
+static void ata_pio_task(void *_data)
+{
+	struct ata_queued_cmd *qc = _data;
+	struct ata_port *ap = qc->ap;
 	u8 status;
+	int poll_next;
+
+fsm_start:
+	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
 
 	/*
 	 * This is purely heuristic.  This is a fast path.
 	 * Sometimes when we enter, BSY will be cleared in
 	 * a chk-status or two.  If not, the drive is probably seeking
 	 * or something.  Snooze for a couple msecs, then
-	 * chk-status again.  If still busy, fall back to
-	 * HSM_ST_POLL state.
+	 * chk-status again.  If still busy, queue delayed work.
 	 */
 	status = ata_busy_wait(ap, ATA_BUSY, 5);
 	if (status & ATA_BUSY) {
 		msleep(2);
 		status = ata_busy_wait(ap, ATA_BUSY, 10);
 		if (status & ATA_BUSY) {
-			ap->hsm_task_state = HSM_ST_POLL;
-			ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
+			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
 			return;
 		}
 	}
 
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	WARN_ON(qc == NULL);
+	/* move the HSM */
+	poll_next = ata_hsm_move(ap, qc, status, 1);
 
-	/* check error */
-	if (status & (ATA_ERR | ATA_DF)) {
-		qc->err_mask |= AC_ERR_DEV;
-		ap->hsm_task_state = HSM_ST_ERR;
-		return;
-	}
-
-	/* transfer data if any */
-	if (is_atapi_taskfile(&qc->tf)) {
-		/* DRQ=0 means no more data to transfer */
-		if ((status & ATA_DRQ) == 0) {
-			ap->hsm_task_state = HSM_ST_LAST;
-			return;
-		}
-
-		atapi_pio_bytes(qc);
-	} else {
-		/* handle BSY=0, DRQ=0 as error */
-		if ((status & ATA_DRQ) == 0) {
-			qc->err_mask |= AC_ERR_HSM;
-			ap->hsm_task_state = HSM_ST_ERR;
-			return;
-		}
-
-		ata_pio_sector(qc);
-	}
-
-	ata_altstatus(ap); /* flush */
-}
-
-static void ata_pio_error(struct ata_port *ap)
-{
-	struct ata_queued_cmd *qc;
-
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	WARN_ON(qc == NULL);
-
-	if (qc->tf.command != ATA_CMD_PACKET)
-		printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
-
-	/* make sure qc->err_mask is available to
-	 * know what's wrong and recover
+	/* another command or interrupt handler
+	 * may be running at this point.
 	 */
-	WARN_ON(qc->err_mask == 0);
-
-	ap->hsm_task_state = HSM_ST_IDLE;
-
-	ata_poll_qc_complete(qc);
-}
-
-static void ata_pio_task(void *_data)
-{
-	struct ata_port *ap = _data;
-	unsigned long timeout;
-	int qc_completed;
-
-fsm_start:
-	timeout = 0;
-	qc_completed = 0;
-
-	switch (ap->hsm_task_state) {
-	case HSM_ST_IDLE:
-		return;
-
-	case HSM_ST:
-		ata_pio_block(ap);
-		break;
-
-	case HSM_ST_LAST:
-		qc_completed = ata_pio_complete(ap);
-		break;
-
-	case HSM_ST_POLL:
-	case HSM_ST_LAST_POLL:
-		timeout = ata_pio_poll(ap);
-		break;
-
-	case HSM_ST_TMOUT:
-	case HSM_ST_ERR:
-		ata_pio_error(ap);
-		return;
-	}
-
-	if (timeout)
-		ata_port_queue_task(ap, ata_pio_task, ap, timeout);
-	else if (!qc_completed)
+	if (poll_next)
 		goto fsm_start;
-}
-
-/**
- *	atapi_packet_task - Write CDB bytes to hardware
- *	@_data: Port to which ATAPI device is attached.
- *
- *	When device has indicated its readiness to accept
- *	a CDB, this function is called.  Send the CDB.
- *	If DMA is to be performed, exit immediately.
- *	Otherwise, we are in polling mode, so poll
- *	status under operation succeeds or fails.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- */
-
-static void atapi_packet_task(void *_data)
-{
-	struct ata_port *ap = _data;
-	struct ata_queued_cmd *qc;
-	u8 status;
-
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	WARN_ON(qc == NULL);
-	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
-
-	/* sleep-wait for BSY to clear */
-	DPRINTK("busy wait\n");
-	if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
-		qc->err_mask |= AC_ERR_TIMEOUT;
-		goto err_out;
-	}
-
-	/* make sure DRQ is set */
-	status = ata_chk_status(ap);
-	if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
-		qc->err_mask |= AC_ERR_HSM;
-		goto err_out;
-	}
-
-	/* send SCSI cdb */
-	DPRINTK("send cdb\n");
-	WARN_ON(qc->dev->cdb_len < 12);
-
-	if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
-	    qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
-		unsigned long flags;
-
-		/* Once we're done issuing command and kicking bmdma,
-		 * irq handler takes over.  To not lose irq, we need
-		 * to clear NOINTR flag before sending cdb, but
-		 * interrupt handler shouldn't be invoked before we're
-		 * finished.  Hence, the following locking.
-		 */
-		spin_lock_irqsave(&ap->host_set->lock, flags);
-		ap->flags &= ~ATA_FLAG_NOINTR;
-		ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
-		ata_altstatus(ap); /* flush */
-
-		if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
-			ap->ops->bmdma_start(qc);	/* initiate bmdma */
-		spin_unlock_irqrestore(&ap->host_set->lock, flags);
-	} else {
-		ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
-		ata_altstatus(ap); /* flush */
-
-		/* PIO commands are handled by polling */
-		ap->hsm_task_state = HSM_ST;
-		ata_port_queue_task(ap, ata_pio_task, ap, 0);
-	}
-
-	return;
-
-err_out:
-	ata_poll_qc_complete(qc);
-}
-
-/**
- *	ata_qc_timeout - Handle timeout of queued command
- *	@qc: Command that timed out
- *
- *	Some part of the kernel (currently, only the SCSI layer)
- *	has noticed that the active command on port @ap has not
- *	completed after a specified length of time.  Handle this
- *	condition by disabling DMA (if necessary) and completing
- *	transactions, with error if necessary.
- *
- *	This also handles the case of the "lost interrupt", where
- *	for some reason (possibly hardware bug, possibly driver bug)
- *	an interrupt was not delivered to the driver, even though the
- *	transaction completed successfully.
- *
- *	LOCKING:
- *	Inherited from SCSI layer (none, can sleep)
- */
-
-static void ata_qc_timeout(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	struct ata_host_set *host_set = ap->host_set;
-	u8 host_stat = 0, drv_stat;
-	unsigned long flags;
-
-	DPRINTK("ENTER\n");
-
-	ap->hsm_task_state = HSM_ST_IDLE;
-
-	spin_lock_irqsave(&host_set->lock, flags);
-
-	switch (qc->tf.protocol) {
-
-	case ATA_PROT_DMA:
-	case ATA_PROT_ATAPI_DMA:
-		host_stat = ap->ops->bmdma_status(ap);
-
-		/* before we do anything else, clear DMA-Start bit */
-		ap->ops->bmdma_stop(qc);
-
-		/* fall through */
-
-	default:
-		ata_altstatus(ap);
-		drv_stat = ata_chk_status(ap);
-
-		/* ack bmdma irq events */
-		ap->ops->irq_clear(ap);
-
-		printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
-		       ap->id, qc->tf.command, drv_stat, host_stat);
-
-		/* complete taskfile transaction */
-		qc->err_mask |= ac_err_mask(drv_stat);
-		break;
-	}
-
-	spin_unlock_irqrestore(&host_set->lock, flags);
-
-	ata_eh_qc_complete(qc);
-
-	DPRINTK("EXIT\n");
-}
-
-/**
- *	ata_eng_timeout - Handle timeout of queued command
- *	@ap: Port on which timed-out command is active
- *
- *	Some part of the kernel (currently, only the SCSI layer)
- *	has noticed that the active command on port @ap has not
- *	completed after a specified length of time.  Handle this
- *	condition by disabling DMA (if necessary) and completing
- *	transactions, with error if necessary.
- *
- *	This also handles the case of the "lost interrupt", where
- *	for some reason (possibly hardware bug, possibly driver bug)
- *	an interrupt was not delivered to the driver, even though the
- *	transaction completed successfully.
- *
- *	LOCKING:
- *	Inherited from SCSI layer (none, can sleep)
- */
-
-void ata_eng_timeout(struct ata_port *ap)
-{
-	DPRINTK("ENTER\n");
-
-	ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
-
-	DPRINTK("EXIT\n");
 }
 
 /**
···
 	struct ata_queued_cmd *qc = NULL;
 	unsigned int i;
 
-	for (i = 0; i < ATA_MAX_QUEUE; i++)
-		if (!test_and_set_bit(i, &ap->qactive)) {
-			qc = ata_qc_from_tag(ap, i);
+	/* no command while frozen */
+	if (unlikely(ap->flags & ATA_FLAG_FROZEN))
+		return NULL;
+
+	/* the last tag is reserved for internal command. */
+	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
+		if (!test_and_set_bit(i, &ap->qc_allocated)) {
+			qc = __ata_qc_from_tag(ap, i);
 			break;
 		}
 
···
 
 /**
  *	ata_qc_new_init - Request an available ATA command, and initialize it
- *	@ap: Port associated with device @dev
  *	@dev: Device from whom we request an available command structure
  *
  *	LOCKING:
  *	None.
  */
 
-struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
-				      struct ata_device *dev)
+struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
 {
+	struct ata_port *ap = dev->ap;
 	struct ata_queued_cmd *qc;
 
 	qc = ata_qc_new(ap);
···
 	qc->flags = 0;
 	tag = qc->tag;
 	if (likely(ata_tag_valid(tag))) {
-		if (tag == ap->active_tag)
-			ap->active_tag = ATA_TAG_POISON;
 		qc->tag = ATA_TAG_POISON;
-		clear_bit(tag, &ap->qactive);
+		clear_bit(tag, &ap->qc_allocated);
 	}
 }
 
 void __ata_qc_complete(struct ata_queued_cmd *qc)
 {
+	struct ata_port *ap = qc->ap;
+
 	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
 	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
 
 	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
 		ata_sg_clean(qc);
 
+	/* command should be marked inactive atomically with qc completion */
+	if (qc->tf.protocol == ATA_PROT_NCQ)
+		ap->sactive &= ~(1 << qc->tag);
+	else
+		ap->active_tag = ATA_TAG_POISON;
+
 	/* atapi: mark qc as inactive to prevent the interrupt handler
 	 * from completing the command twice later, before the error handler
 	 * is called. (when rc != 0 and atapi request sense is needed)
 	 */
 	qc->flags &= ~ATA_QCFLAG_ACTIVE;
+	ap->qc_active &= ~(1 << qc->tag);
 
 	/* call completion callback */
 	qc->complete_fn(qc);
+}
+
+/**
+ *	ata_qc_complete - Complete an active ATA command
+ *	@qc: Command to complete
+ *	@err_mask: ATA Status register contents
+ *
+ *	Indicate to the mid and upper layers that an ATA
+ *	command has completed, with either an ok or not-ok status.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	/* XXX: New EH and old EH use different mechanisms to
+	 * synchronize EH with regular execution path.
+	 *
+	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
+	 * Normal execution path is responsible for not accessing a
+	 * failed qc.  libata core enforces the rule by returning NULL
+	 * from ata_qc_from_tag() for failed qcs.
+	 *
+	 * Old EH depends on ata_qc_complete() nullifying completion
+	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
+	 * not synchronize with interrupt handler.  Only PIO task is
+	 * taken care of.
+	 */
+	if (ap->ops->error_handler) {
+		WARN_ON(ap->flags & ATA_FLAG_FROZEN);
+
+		if (unlikely(qc->err_mask))
+			qc->flags |= ATA_QCFLAG_FAILED;
+
+		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
+			if (!ata_tag_internal(qc->tag)) {
+				/* always fill result TF for failed qc */
+				ap->ops->tf_read(ap, &qc->result_tf);
+				ata_qc_schedule_eh(qc);
+				return;
+			}
+		}
+
+		/* read result TF if requested */
+		if (qc->flags & ATA_QCFLAG_RESULT_TF)
+			ap->ops->tf_read(ap, &qc->result_tf);
+
+		__ata_qc_complete(qc);
+	} else {
+		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
+			return;
+
+		/* read result TF if failed or requested */
+		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
+			ap->ops->tf_read(ap, &qc->result_tf);
+
+		__ata_qc_complete(qc);
+	}
+}
+
+/**
+ *	ata_qc_complete_multiple - Complete multiple qcs successfully
+ *	@ap: port in question
+ *	@qc_active: new qc_active mask
+ *	@finish_qc: LLDD callback invoked before completing a qc
+ *
+ *	Complete in-flight commands.  This functions is meant to be
+ *	called from low-level driver's interrupt routine to complete
+ *	requests normally.  ap->qc_active and @qc_active is compared
+ *	and commands are completed accordingly.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of completed commands on success, -errno otherwise.
+ */
+int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
+			     void (*finish_qc)(struct ata_queued_cmd *))
+{
+	int nr_done = 0;
+	u32 done_mask;
+	int i;
+
+	done_mask = ap->qc_active ^ qc_active;
+
+	if (unlikely(done_mask & qc_active)) {
+		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
+				"(%08x->%08x)\n", ap->qc_active, qc_active);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ATA_MAX_QUEUE; i++) {
+		struct ata_queued_cmd *qc;
+
+		if (!(done_mask & (1 << i)))
+			continue;
+
+		if ((qc = ata_qc_from_tag(ap, i))) {
+			if (finish_qc)
+				finish_qc(qc);
+			ata_qc_complete(qc);
+			nr_done++;
+		}
+	}
+
+	return nr_done;
 }
 
 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
···
 	struct ata_port *ap = qc->ap;
 
 	switch (qc->tf.protocol) {
+	case ATA_PROT_NCQ:
 	case ATA_PROT_DMA:
 	case ATA_PROT_ATAPI_DMA:
 		return 1;
···
 {
 	struct ata_port *ap = qc->ap;
 
-	qc->ap->active_tag = qc->tag;
+	/* Make sure only one non-NCQ command is outstanding.  The
+	 * check is skipped for old EH because it reuses active qc to
+	 * request ATAPI sense.
+	 */
+	WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
+
+	if (qc->tf.protocol == ATA_PROT_NCQ) {
+		WARN_ON(ap->sactive & (1 << qc->tag));
+		ap->sactive |= 1 << qc->tag;
+	} else {
+		WARN_ON(ap->sactive);
+		ap->active_tag = qc->tag;
+	}
+
 	qc->flags |= ATA_QCFLAG_ACTIVE;
+	ap->qc_active |= 1 << qc->tag;
 
 	if (ata_should_dma_map(qc)) {
 		if (qc->flags & ATA_QCFLAG_SG) {
···
 {
 	struct ata_port *ap = qc->ap;
 
+	/* Use polling pio if the LLD doesn't handle
+	 * interrupt driven pio and atapi CDB interrupt.
+	 */
+	if (ap->flags & ATA_FLAG_PIO_POLLING) {
+		switch (qc->tf.protocol) {
+		case ATA_PROT_PIO:
+		case ATA_PROT_ATAPI:
+		case ATA_PROT_ATAPI_NODATA:
+			qc->tf.flags |= ATA_TFLAG_POLLING;
+			break;
+		case ATA_PROT_ATAPI_DMA:
+			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
+				/* see ata_dma_blacklisted() */
+				BUG();
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* select the device */
 	ata_dev_select(ap, qc->dev->devno, 1, 0);
 
+	/* start the command */
 	switch (qc->tf.protocol) {
 	case ATA_PROT_NODATA:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
 		ata_tf_to_host(ap, &qc->tf);
+		ap->hsm_task_state = HSM_ST_LAST;
+
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
 		break;
 
 	case ATA_PROT_DMA:
+		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
+
 		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
 		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
 		ap->ops->bmdma_start(qc);	    /* initiate bmdma */
+		ap->hsm_task_state = HSM_ST_LAST;
 		break;
 
-	case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
-		ata_qc_set_polling(qc);
+	case ATA_PROT_PIO:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
 		ata_tf_to_host(ap, &qc->tf);
-		ap->hsm_task_state = HSM_ST;
-		ata_port_queue_task(ap, ata_pio_task, ap, 0);
+
+		if (qc->tf.flags & ATA_TFLAG_WRITE) {
+			/* PIO data out protocol */
+			ap->hsm_task_state = HSM_ST_FIRST;
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
+			/* always send first data block using
+			 * the ata_pio_task() codepath.
+			 */
+		} else {
+			/* PIO data in protocol */
+			ap->hsm_task_state = HSM_ST;
+
+			if (qc->tf.flags & ATA_TFLAG_POLLING)
+				ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
+			/* if polling, ata_pio_task() handles the rest.
+			 * otherwise, interrupt handler takes over from here.
+			 */
+		}
+
 		break;
 
 	case ATA_PROT_ATAPI:
-		ata_qc_set_polling(qc);
-		ata_tf_to_host(ap, &qc->tf);
-		ata_port_queue_task(ap, atapi_packet_task, ap, 0);
-		break;
-
 	case ATA_PROT_ATAPI_NODATA:
-		ap->flags |= ATA_FLAG_NOINTR;
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
 		ata_tf_to_host(ap, &qc->tf);
-		ata_port_queue_task(ap, atapi_packet_task, ap, 0);
+
+		ap->hsm_task_state = HSM_ST_FIRST;
+
+		/* send cdb by polling if no cdb interrupt */
+		if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
+		    (qc->tf.flags & ATA_TFLAG_POLLING))
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
 		break;
 
 	case ATA_PROT_ATAPI_DMA:
-		ap->flags |= ATA_FLAG_NOINTR;
+		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
+
 		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
 		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
-		ata_port_queue_task(ap, atapi_packet_task, ap, 0);
+		ap->hsm_task_state = HSM_ST_FIRST;
+
+		/* send cdb by polling if no cdb interrupt */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
 		break;
 
 	default:
···
 inline unsigned int ata_host_intr (struct ata_port *ap,
 				   struct ata_queued_cmd *qc)
 {
-	u8 status, host_stat;
+	u8 status, host_stat = 0;
 
-	switch (qc->tf.protocol) {
+	VPRINTK("ata%u: protocol %d task_state %d\n",
+		ap->id, qc->tf.protocol, ap->hsm_task_state);
 
-	case ATA_PROT_DMA:
-	case ATA_PROT_ATAPI_DMA:
-	case ATA_PROT_ATAPI:
-		/* check status of DMA engine */
-		host_stat = ap->ops->bmdma_status(ap);
-		VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
+	/* Check whether we are expecting interrupt in this state */
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Some pre-ATAPI-4 devices assert INTRQ
+		 * at this state when ready to receive CDB.
+		 */
 
-		/* if it's not our irq... */
-		if (!(host_stat & ATA_DMA_INTR))
+		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
+		 * The flag was turned on only for atapi devices.
+		 * No need to check is_atapi_taskfile(&qc->tf) again.
+		 */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
 			goto idle_irq;
-
-		/* before we do anything else, clear DMA-Start bit */
-		ap->ops->bmdma_stop(qc);
-
-		/* fall through */
-
-	case ATA_PROT_ATAPI_NODATA:
-	case ATA_PROT_NODATA:
-		/* check altstatus */
-		status = ata_altstatus(ap);
-		if (status & ATA_BUSY)
-			goto idle_irq;
-
-		/* check main status, clearing INTRQ */
-		status = ata_chk_status(ap);
-		if (unlikely(status & ATA_BUSY))
-			goto idle_irq;
-		DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
-			ap->id, qc->tf.protocol, status);
-
-		/* ack bmdma irq events */
-		ap->ops->irq_clear(ap);
-
-		/* complete taskfile transaction */
-		qc->err_mask |= ac_err_mask(status);
-		ata_qc_complete(qc);
 		break;
+	case HSM_ST_LAST:
+		if (qc->tf.protocol == ATA_PROT_DMA ||
+		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
+			/* check status of DMA engine */
+			host_stat = ap->ops->bmdma_status(ap);
+			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
 
+			/* if it's not our irq... */
+			if (!(host_stat & ATA_DMA_INTR))
+				goto idle_irq;
+
+			/* before we do anything else, clear DMA-Start bit */
+			ap->ops->bmdma_stop(qc);
+
+			if (unlikely(host_stat & ATA_DMA_ERR)) {
+				/* error when transfering data to/from memory */
+				qc->err_mask |= AC_ERR_HOST_BUS;
+				ap->hsm_task_state = HSM_ST_ERR;
+			}
+		}
+		break;
+	case HSM_ST:
+		break;
 	default:
 		goto idle_irq;
 	}
 
+	/* check altstatus */
+	status = ata_altstatus(ap);
+	if (status & ATA_BUSY)
+		goto idle_irq;
+
+	/* check main status, clearing INTRQ */
+	status = ata_chk_status(ap);
+	if (unlikely(status & ATA_BUSY))
+		goto idle_irq;
+
+	/* ack bmdma irq events */
+	ap->ops->irq_clear(ap);
+
+	ata_hsm_move(ap, qc, status, 0);
 	return 1;	/* irq handled */
 
 idle_irq:
···
 #ifdef ATA_IRQ_TRAP
 	if ((ap->stats.idle_irq % 1000) == 0) {
 		ata_irq_ack(ap, 0); /* debug trap */
-		printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
+		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
 		return 1;
 	}
 #endif
···
 
 		ap = host_set->ports[i];
 		if (ap &&
-		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
 			struct ata_queued_cmd *qc;
 
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
 			    (qc->flags & ATA_QCFLAG_ACTIVE))
 				handled |= ata_host_intr(ap, qc);
 		}
···
 	return IRQ_RETVAL(handled);
 }
 
+/**
+ *	sata_scr_valid - test whether SCRs are accessible
+ *	@ap: ATA port to test SCR accessibility for
+ *
+ *	Test whether SCRs are accessible for @ap.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if SCRs are accessible, 0 otherwise.
+ */
+int sata_scr_valid(struct ata_port *ap)
+{
+	return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
+}
+
+/**
+ *	sata_scr_read - read SCR register of the specified port
+ *	@ap: ATA port to read SCR for
+ *	@reg: SCR to read
+ *	@val: Place to store read value
+ *
+ *	Read SCR register @reg of @ap into *@val.  This function is
+ *	guaranteed to succeed if the cable type of the port is SATA
+ *	and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
+{
+	if (sata_scr_valid(ap)) {
+		*val = ap->ops->scr_read(ap, reg);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	sata_scr_write - write SCR register of the specified port
+ *	@ap: ATA port to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	Write @val to SCR register @reg of @ap.  This function is
+ *	guaranteed to succeed if the cable type of the port is SATA
+ *	and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write(struct ata_port *ap, int reg, u32 val)
+{
+	if (sata_scr_valid(ap)) {
+		ap->ops->scr_write(ap, reg, val);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	sata_scr_write_flush - write SCR register of the specified port and flush
+ *	@ap: ATA port to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	This function is identical to sata_scr_write() except that this
+ *	function performs flush after writing to the register.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
+{
+	if (sata_scr_valid(ap)) {
+		ap->ops->scr_write(ap, reg, val);
+		ap->ops->scr_read(ap, reg);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	ata_port_online - test whether the given port is online
+ *	@ap: ATA port to test
+ *
+ *	Test whether @ap is online.  Note that this function returns 0
+ *	if online status of @ap cannot be obtained, so
+ *	ata_port_online(ap) != !ata_port_offline(ap).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if the port online status is available and online.
+ */
+int ata_port_online(struct ata_port *ap)
+{
+	u32 sstatus;
+
+	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
+		return 1;
+	return 0;
+}
+
+/**
+ *	ata_port_offline - test whether the given port is offline
+ *	@ap: ATA port to test
+ *
+ *	Test whether @ap is offline.  Note that this function returns
+ *	0 if offline status of @ap cannot be obtained, so
+ *	ata_port_online(ap) != !ata_port_offline(ap).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if the port offline status is available and offline.
+ */
+int ata_port_offline(struct ata_port *ap)
+{
+	u32 sstatus;
+
+	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
+		return 1;
+	return 0;
+}
 
 /*
  * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
  * without filling any other registers
  */
-static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
-			     u8 cmd)
+static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
 {
 	struct ata_taskfile tf;
 	int err;
 
-	ata_tf_init(ap, &tf, dev->devno);
+	ata_tf_init(dev, &tf);
 
 	tf.command = cmd;
 	tf.flags |= ATA_TFLAG_DEVICE;
 	tf.protocol = ATA_PROT_NODATA;
 
-	err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
+	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
 	if (err)
-		printk(KERN_ERR "%s: ata command failed: %d\n",
-				__FUNCTION__, err);
+		ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
+			       __FUNCTION__, err);
 
 	return err;
 }
 
-static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
+static int ata_flush_cache(struct ata_device *dev)
 {
 	u8 cmd;
 
···
 	else
 		cmd = ATA_CMD_FLUSH;
 
-	return ata_do_simple_cmd(ap, dev, cmd);
+	return ata_do_simple_cmd(dev, cmd);
 }
 
-static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
+static int ata_standby_drive(struct ata_device *dev)
 {
-	return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
+	return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
 }
 
-static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
+static int ata_start_drive(struct ata_device *dev)
 {
-	return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
+	return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
 }
 
 /**
  *	ata_device_resume - wakeup a previously suspended devices
- *	@ap: port the device is connected to
  *	@dev: the device to resume
  *
  *	Kick the drive back into action, by sending it an idle immediate
···
  *	and host.
  *
  */
-int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
+int ata_device_resume(struct ata_device *dev)
 {
+	struct ata_port *ap = dev->ap;
+
 	if (ap->flags & ATA_FLAG_SUSPENDED) {
+		struct ata_device *failed_dev;
+
 		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
 		ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 200000);
+
 		ap->flags &= ~ATA_FLAG_SUSPENDED;
-		ata_set_mode(ap);
+		while (ata_set_mode(ap, &failed_dev))
+			ata_dev_disable(failed_dev);
 	}
-	if (!ata_dev_present(dev))
+	if (!ata_dev_enabled(dev))
 		return 0;
 	if (dev->class == ATA_DEV_ATA)
-		ata_start_drive(ap, dev);
+		ata_start_drive(dev);
 
 	return 0;
 }
 
 /**
  *	ata_device_suspend - prepare a device for suspend
- *	@ap: port the device is connected to
  *	@dev: the device to suspend
  *	@state: target power management state
  *
  *	Flush the cache on the drive, if appropriate, then issue a
  *	standbynow command.
  */
-int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
+int ata_device_suspend(struct ata_device *dev, pm_message_t state)
 {
-	if (!ata_dev_present(dev))
+	struct ata_port *ap = dev->ap;
+
+	if (!ata_dev_enabled(dev))
 		return 0;
 	if (dev->class == ATA_DEV_ATA)
-		ata_flush_cache(ap, dev);
+		ata_flush_cache(dev);
 
 	if (state.event != PM_EVENT_FREEZE)
-		ata_standby_drive(ap, dev);
+		ata_standby_drive(dev);
 	ap->flags |= ATA_FLAG_SUSPENDED;
 	return 0;
 }
···
 }
 
 /**
+ *	ata_dev_init - Initialize an ata_device structure
+ *	@dev: Device structure to initialize
+ *
+ *	Initialize @dev in preparation for probing.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_dev_init(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	unsigned long flags;
+
+	/* SATA spd limit is bound to the first device */
+	ap->sata_spd_limit = ap->hw_sata_spd_limit;
+
+	/* High bits of dev->flags are used to record warm plug
+	 * requests which occur asynchronously.  Synchronize using
+	 * host_set lock.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	dev->flags &= ~ATA_DFLAG_INIT_MASK;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
+	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
+	dev->pio_mask = UINT_MAX;
+	dev->mwdma_mask = UINT_MAX;
+	dev->udma_mask = UINT_MAX;
+}
+
+/**
  *	ata_host_init - Initialize an ata_port structure
  *	@ap: Structure to initialize
  *	@host: associated SCSI mid-layer structure
···
  *	LOCKING:
  *	Inherited from caller.
  */
-
 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
 			  struct ata_host_set *host_set,
 			  const struct ata_probe_ent *ent, unsigned int port_no)
···
 	host->unique_id = ata_unique_id++;
 	host->max_cmd_len = 12;
 
-	ap->flags = ATA_FLAG_PORT_DISABLED;
+	ap->lock = &host_set->lock;
+	ap->flags = ATA_FLAG_DISABLED;
 	ap->id = host->unique_id;
 	ap->host = host;
 	ap->ctl = ATA_DEVCTL_OBS;
···
 	ap->udma_mask = ent->udma_mask;
 	ap->flags |= ent->host_flags;
 	ap->ops = ent->port_ops;
-	ap->cbl = ATA_CBL_NONE;
+	ap->hw_sata_spd_limit = UINT_MAX;
 	ap->active_tag = ATA_TAG_POISON;
 	ap->last_ctl = 0xFF;
 
+#if defined(ATA_VERBOSE_DEBUG)
+	/* turn on all debugging levels */
+	ap->msg_enable = 0x00FF;
+#elif defined(ATA_DEBUG)
+	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
+#else 
+	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
+#endif
+
 	INIT_WORK(&ap->port_task, NULL, NULL);
+	INIT_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
+	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
 	INIT_LIST_HEAD(&ap->eh_done_q);
+	init_waitqueue_head(&ap->eh_wait_q);
+
+	/* set cable type */
+	ap->cbl = ATA_CBL_NONE;
+	if (ap->flags & ATA_FLAG_SATA)
+		ap->cbl = ATA_CBL_SATA;
 
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
 		struct ata_device *dev = &ap->device[i];
+		dev->ap = ap;
 		dev->devno = i;
-		dev->pio_mask = UINT_MAX;
-		dev->mwdma_mask = UINT_MAX;
-		dev->udma_mask = UINT_MAX;
+		ata_dev_init(dev);
 	}
 
 #ifdef ATA_IRQ_TRAP
···
 
 	DPRINTK("ENTER\n");
 
-	if (!ent->port_ops->probe_reset &&
+	if (!ent->port_ops->error_handler &&
 	    !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
 		printk(KERN_ERR "ata%u: no reset mechanism available\n",
 		       port_no);
···
 
 	host->transportt = &ata_scsi_transport_template;
 
-	ap = (struct ata_port *) &host->hostdata[0];
+	ap = ata_shost_to_port(host);
 
 	ata_host_init(ap, host, host_set, ent, port_no);
 
···
  *	RETURNS:
  *	Number of ports registered.  Zero on error (no ports registered).
  */
-
 int ata_device_add(const struct ata_probe_ent *ent)
 {
 	unsigned int count = 0, i;
 	struct device *dev = ent->dev;
 	struct ata_host_set *host_set;
+	int rc;
 
 	DPRINTK("ENTER\n");
 	/* alloc a container for our list of ATA ports (buses) */
···
 				(ap->pio_mask << ATA_SHIFT_PIO);
 
 		/* print per-port info to dmesg */
-		printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
-				 "bmdma 0x%lX irq %lu\n",
-			ap->id,
-			ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
-			ata_mode_string(xfer_mode_mask),
-	       		ap->ioaddr.cmd_addr,
-	       		ap->ioaddr.ctl_addr,
-	       		ap->ioaddr.bmdma_addr,
-	       		ent->irq);
+		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
+				"ctl 0x%lX bmdma 0x%lX irq %lu\n",
+				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
+				ata_mode_string(xfer_mode_mask),
+				ap->ioaddr.cmd_addr,
+				ap->ioaddr.ctl_addr,
+				ap->ioaddr.bmdma_addr,
+				ent->irq);
 
 		ata_chk_status(ap);
 		host_set->ops->irq_clear(ap);
+		ata_eh_freeze_port(ap);	/* freeze port before requesting IRQ */
 		count++;
 	}
 
···
 		goto err_free_ret;
 
 	/* obtain irq, that is shared between channels */
-	if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
-			DRV_NAME, host_set))
+	rc = request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
+			 DRV_NAME, host_set);
+	if (rc) {
+		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
+			   ent->irq, rc);
 		goto err_out;
+	}
 
 	/* perform each probe synchronously */
 	DPRINTK("probe begin\n");
 	for (i = 0; i < count; i++) {
 		struct ata_port *ap;
+		u32 scontrol;
 		int rc;
 
 		ap = host_set->ports[i];
 
-		DPRINTK("ata%u: bus probe begin\n", ap->id);
-		rc = ata_bus_probe(ap);
-		DPRINTK("ata%u: bus probe end\n", ap->id);
-
-		if (rc) {
-			/* FIXME: do something useful here?
-			 * Current libata behavior will
-			 * tear down everything when
-			 * the module is removed
-			 * or the h/w is unplugged.
-			 */
+		/* init sata_spd_limit to the current value */
+		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
+			int spd = (scontrol >> 4) & 0xf;
+			ap->hw_sata_spd_limit &= (1 << spd) - 1;
 		}
+		ap->sata_spd_limit = ap->hw_sata_spd_limit;
 
 		rc = scsi_add_host(ap->host, dev);
 		if (rc) {
-			printk(KERN_ERR "ata%u: scsi_add_host failed\n",
-			       ap->id);
+			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
 			/* FIXME: do something useful here */
 			/* FIXME: handle unconditional calls to
 			 * scsi_scan_host and ata_host_remove, below,
 			 * at the very least
 			 */
+		}
+
+		if (ap->ops->error_handler) {
+			unsigned long flags;
+
+			ata_port_probe(ap);
+
+			/* kick EH for boot probing */
+			spin_lock_irqsave(ap->lock, flags);
+
+			ap->eh_info.probe_mask = (1 << ATA_MAX_DEVICES) - 1;
+			ap->eh_info.action |= ATA_EH_SOFTRESET;
+
+			ap->flags |= ATA_FLAG_LOADING;
+			ata_port_schedule_eh(ap);
+
+			spin_unlock_irqrestore(ap->lock, flags);
+
+			/* wait for EH to finish */
+			ata_port_wait_eh(ap);
+		} else {
+			DPRINTK("ata%u: bus probe begin\n", ap->id);
+			rc = ata_bus_probe(ap);
+			DPRINTK("ata%u: bus probe end\n", ap->id);
+
+			if (rc) {
+				/* FIXME: do something useful here?
+				 * Current libata behavior will
+				 * tear down everything when
+				 * the module is removed
+				 * or the h/w is unplugged.
+				 */
+			}
 		}
 	}
 
···
 }
 
 /**
+ *	ata_port_detach - Detach ATA port in prepration of device removal
+ *	@ap: ATA port to be detached
+ *
+ *	Detach all ATA devices and the associated SCSI devices of @ap;
+ *	then, remove the associated SCSI host.  @ap is guaranteed to
+ *	be quiescent on return from this function.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_port_detach(struct ata_port *ap)
+{
+	unsigned long flags;
+	int i;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	/* tell EH we're leaving & flush EH */
+	spin_lock_irqsave(ap->lock, flags);
+	ap->flags |= ATA_FLAG_UNLOADING;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+
+	/* EH is now guaranteed to see UNLOADING, so no new device
+	 * will be attached.  Disable all existing devices.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		ata_dev_disable(&ap->device[i]);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* Final freeze & EH.  All in-flight commands are aborted.  EH
+	 * will be skipped and retrials will be terminated with bad
+	 * target.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	ata_port_freeze(ap);	/* won't be thawed */
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+
+	/* Flush hotplug task.  The sequence is similar to
+	 * ata_port_flush_task().
+	 */
+	flush_workqueue(ata_aux_wq);
+	cancel_delayed_work(&ap->hotplug_task);
+	flush_workqueue(ata_aux_wq);
+
+	/* remove the associated SCSI host */
+	scsi_remove_host(ap->host);
+}
+
+/**
  *	ata_host_set_remove - PCI layer callback for device removal
  *	@host_set: ATA host set that was removed
  *
···
 
 void ata_host_set_remove(struct ata_host_set *host_set)
 {
-	struct ata_port *ap;
 	unsigned int i;
 
-	for (i = 0; i < host_set->n_ports; i++) {
-		ap = host_set->ports[i];
-		scsi_remove_host(ap->host);
-	}
+	for (i = 0; i < host_set->n_ports; i++)
+		ata_port_detach(host_set->ports[i]);
 
 	free_irq(host_set->irq, host_set);
 
 	for (i = 0; i < host_set->n_ports; i++) {
-		ap = host_set->ports[i];
+		struct ata_port *ap = host_set->ports[i];
 
 		ata_scsi_release(ap->host);
 
···
 
 int ata_scsi_release(struct Scsi_Host *host)
 {
-	struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
-	int i;
+	struct ata_port *ap = ata_shost_to_port(host);
 
 	DPRINTK("ENTER\n");
 
 	ap->ops->port_disable(ap);
 	ata_host_remove(ap, 0);
-	for (i = 0; i < ATA_MAX_DEVICES; i++)
-		kfree(ap->device[i].id);
 
 	DPRINTK("EXIT\n");
 	return 1;
···
 {
 	struct device *dev = pci_dev_to_dev(pdev);
 	struct ata_host_set *host_set = dev_get_drvdata(dev);
+	struct ata_host_set *host_set2 = host_set->next;
 
 	ata_host_set_remove(host_set);
+	if (host_set2)
+		ata_host_set_remove(host_set2);
+
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	dev_set_drvdata(dev, NULL);
···
 	if (!ata_wq)
 		return -ENOMEM;
 
+	ata_aux_wq = create_singlethread_workqueue("ata_aux");
+	if (!ata_aux_wq) {
+		destroy_workqueue(ata_wq);
+		return -ENOMEM;
+	}
+
 	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
 	return 0;
 }
···
 static void __exit ata_exit(void)
 {
 	destroy_workqueue(ata_wq);
+	destroy_workqueue(ata_aux_wq);
 }
 
 module_init(ata_init);
···
 	return rc;
 }
 
+/**
+ *	ata_wait_register - wait until register value changes
+ *	@reg: IO-mapped register
+ *	@mask: Mask to apply to read register value
+ *	@val: Wait condition
+ *	@interval_msec: polling interval in milliseconds
+ *	@timeout_msec: timeout in milliseconds
+ *
+ *	Waiting for some bits of register to change is a common
+ *	operation for ATA controllers.  This function reads 32bit LE
+ *	IO-mapped register @reg and tests for the following condition.
+ *
+ *	(*@reg & mask) != val
+ *
+ *	If the condition is met, it returns; otherwise, the process is
+ *	repeated after @interval_msec until timeout.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	The final register value.
+ */
+u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
+		      unsigned long interval_msec,
+		      unsigned long timeout_msec)
+{
+	unsigned long timeout;
+	u32 tmp;
+
+	tmp = ioread32(reg);
+
+	/* Calculate timeout _after_ the first read to make sure
+	 * preceding writes reach the controller before starting to
+	 * eat away the timeout.
+	 */
+	timeout = jiffies + (timeout_msec * HZ) / 1000;
+
+	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
+		msleep(interval_msec);
+		tmp = ioread32(reg);
+	}
+
+	return tmp;
+}
+
 /*
  * libata is essentially a library of internal helper functions for
  * low-level ATA host controller drivers.  As such, the API/ABI is
···
  * Do not depend on ABI/API stability.
  */
 
+EXPORT_SYMBOL_GPL(sata_deb_timing_boot);
+EXPORT_SYMBOL_GPL(sata_deb_timing_eh);
+EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst);
 EXPORT_SYMBOL_GPL(ata_std_bios_param);
 EXPORT_SYMBOL_GPL(ata_std_ports);
 EXPORT_SYMBOL_GPL(ata_device_add);
+EXPORT_SYMBOL_GPL(ata_port_detach);
 EXPORT_SYMBOL_GPL(ata_host_set_remove);
 EXPORT_SYMBOL_GPL(ata_sg_init);
 EXPORT_SYMBOL_GPL(ata_sg_init_one);
-EXPORT_SYMBOL_GPL(__ata_qc_complete);
+EXPORT_SYMBOL_GPL(ata_hsm_move);
+EXPORT_SYMBOL_GPL(ata_qc_complete);
+EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
-EXPORT_SYMBOL_GPL(ata_eng_timeout);
 EXPORT_SYMBOL_GPL(ata_tf_load);
 EXPORT_SYMBOL_GPL(ata_tf_read);
 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
···
 EXPORT_SYMBOL_GPL(ata_port_stop);
 EXPORT_SYMBOL_GPL(ata_host_stop);
 EXPORT_SYMBOL_GPL(ata_interrupt);
+EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
+EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
+EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq);
 EXPORT_SYMBOL_GPL(ata_qc_prep);
 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
···
 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
 EXPORT_SYMBOL_GPL(ata_bmdma_status);
 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
+EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
+EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
+EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
+EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
+EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
 EXPORT_SYMBOL_GPL(ata_port_probe);
+EXPORT_SYMBOL_GPL(sata_set_spd);
+EXPORT_SYMBOL_GPL(sata_phy_debounce);
+EXPORT_SYMBOL_GPL(sata_phy_resume);
 EXPORT_SYMBOL_GPL(sata_phy_reset);
 EXPORT_SYMBOL_GPL(__sata_phy_reset);
 EXPORT_SYMBOL_GPL(ata_bus_reset);
-EXPORT_SYMBOL_GPL(ata_std_probeinit);
+EXPORT_SYMBOL_GPL(ata_std_prereset);
 EXPORT_SYMBOL_GPL(ata_std_softreset);
 EXPORT_SYMBOL_GPL(sata_std_hardreset);
 EXPORT_SYMBOL_GPL(ata_std_postreset);
-EXPORT_SYMBOL_GPL(ata_std_probe_reset);
-EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
 EXPORT_SYMBOL_GPL(ata_dev_classify);
 EXPORT_SYMBOL_GPL(ata_dev_pair);
 EXPORT_SYMBOL_GPL(ata_port_disable);
 EXPORT_SYMBOL_GPL(ata_ratelimit);
+EXPORT_SYMBOL_GPL(ata_wait_register);
 EXPORT_SYMBOL_GPL(ata_busy_sleep);
 EXPORT_SYMBOL_GPL(ata_port_queue_task);
 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
+EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
+EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
 EXPORT_SYMBOL_GPL(ata_scsi_release);
 EXPORT_SYMBOL_GPL(ata_host_intr);
+EXPORT_SYMBOL_GPL(sata_scr_valid);
+EXPORT_SYMBOL_GPL(sata_scr_read);
+EXPORT_SYMBOL_GPL(sata_scr_write);
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
+EXPORT_SYMBOL_GPL(ata_port_online);
+EXPORT_SYMBOL_GPL(ata_port_offline);
 EXPORT_SYMBOL_GPL(ata_id_string);
 EXPORT_SYMBOL_GPL(ata_id_c_string);
 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
-EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
-EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
 
 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
 EXPORT_SYMBOL_GPL(ata_timing_compute);
···
 EXPORT_SYMBOL_GPL(ata_device_resume);
 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
+
+EXPORT_SYMBOL_GPL(ata_eng_timeout);
+EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
+EXPORT_SYMBOL_GPL(ata_port_abort);
+EXPORT_SYMBOL_GPL(ata_port_freeze);
+EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
+EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
+EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
+EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
+EXPORT_SYMBOL_GPL(ata_do_eh);

drivers/scsi/libata-eh.c

···
+/*
+ *  libata-eh.c - libata error handling
+ *
+ *  Maintained by:  Jeff Garzik <[e-mail]>
+ *    		    Please ALWAYS copy [e-mail]
+ *		    on emails.
+ *
+ *  Copyright 2006 Tejun Heo <[e-mail]>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation; either version 2, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ *  USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available from http://www.t13.org/ and
+ *  http://www.sata-io.org/
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include "scsi_transport_api.h"
+
+#include <linux/libata.h>
+
+#include "libata.h"
+
+static void __ata_port_freeze(struct ata_port *ap);
+static void ata_eh_finish(struct ata_port *ap);
+
+static void ata_ering_record(struct ata_ering *ering, int is_io,
+			     unsigned int err_mask)
+{
+	struct ata_ering_entry *ent;
+
+	WARN_ON(!err_mask);
+
+	ering->cursor++;
+	ering->cursor %= ATA_ERING_SIZE;
+
+	ent = &ering->ring[ering->cursor];
+	ent->is_io = is_io;
+	ent->err_mask = err_mask;
+	ent->timestamp = get_jiffies_64();
+}
+
+static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
+{
+	struct ata_ering_entry *ent = &ering->ring[ering->cursor];
+	if (!ent->err_mask)
+		return NULL;
+	return ent;
+}
+
+static int ata_ering_map(struct ata_ering *ering,
+			 int (*map_fn)(struct ata_ering_entry *, void *),
+			 void *arg)
+{
+	int idx, rc = 0;
+	struct ata_ering_entry *ent;
+
+	idx = ering->cursor;
+	do {
+		ent = &ering->ring[idx];
+		if (!ent->err_mask)
+			break;
+		rc = map_fn(ent, arg);
+		if (rc)
+			break;
+		idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
+	} while (idx != ering->cursor);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_timed_out - SCSI layer time out callback
+ *	@cmd: timed out SCSI command
+ *
+ *	Handles SCSI layer timeout.  We race with normal completion of
+ *	the qc for @cmd.  If the qc is already gone, we lose and let
+ *	the scsi command finish (EH_HANDLED).  Otherwise, the qc has
+ *	timed out and EH should be invoked.  Prevent ata_qc_complete()
+ *	from finishing it by setting EH_SCHEDULED and return
+ *	EH_NOT_HANDLED.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Called from timer context
+ *
+ *	RETURNS:
+ *	EH_HANDLED or EH_NOT_HANDLED
+ */
+enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+{
+	struct Scsi_Host *host = cmd->device->host;
+	struct ata_port *ap = ata_shost_to_port(host);
+	unsigned long flags;
+	struct ata_queued_cmd *qc;
+	enum scsi_eh_timer_return ret;
+
+	DPRINTK("ENTER\n");
+
+	if (ap->ops->error_handler) {
+		ret = EH_NOT_HANDLED;
+		goto out;
+	}
+
+	ret = EH_HANDLED;
+	spin_lock_irqsave(ap->lock, flags);
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+	if (qc) {
+		WARN_ON(qc->scsicmd != cmd);
+		qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
+		qc->err_mask |= AC_ERR_TIMEOUT;
+		ret = EH_NOT_HANDLED;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+ out:
+	DPRINTK("EXIT, ret=%d\n", ret);
+	return ret;
+}
+
+/**
+ *	ata_scsi_error - SCSI layer error handler callback
+ *	@host: SCSI host on which error occurred
+ *
+ *	Handles SCSI-layer-thrown error events.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+void ata_scsi_error(struct Scsi_Host *host)
+{
+	struct ata_port *ap = ata_shost_to_port(host);
+	spinlock_t *ap_lock = ap->lock;
+	int i, repeat_cnt = ATA_EH_MAX_REPEAT;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	/* synchronize with port task */
+	ata_port_flush_task(ap);
+
+	/* synchronize with host_set lock and sort out timeouts */
+
+	/* For new EH, all qcs are finished in one of three ways -
+	 * normal completion, error completion, and SCSI timeout.
+	 * Both cmpletions can race against SCSI timeout.  When normal
+	 * completion wins, the qc never reaches EH.  When error
+	 * completion wins, the qc has ATA_QCFLAG_FAILED set.
+	 *
+	 * When SCSI timeout wins, things are a bit more complex.
+	 * Normal or error completion can occur after the timeout but
+	 * before this point.  In such cases, both types of
+	 * completions are honored.  A scmd is determined to have
+	 * timed out iff its associated qc is active and not failed.
+	 */
+	if (ap->ops->error_handler) {
+		struct scsi_cmnd *scmd, *tmp;
+		int nr_timedout = 0;
+
+		spin_lock_irqsave(ap_lock, flags);
+
+		list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
+			struct ata_queued_cmd *qc;
+
+			for (i = 0; i < ATA_MAX_QUEUE; i++) {
+				qc = __ata_qc_from_tag(ap, i);
+				if (qc->flags & ATA_QCFLAG_ACTIVE &&
+				    qc->scsicmd == scmd)
+					break;
+			}
+
+			if (i < ATA_MAX_QUEUE) {
+				/* the scmd has an associated qc */
+				if (!(qc->flags & ATA_QCFLAG_FAILED)) {
+					/* which hasn't failed yet, timeout */
+					qc->err_mask |= AC_ERR_TIMEOUT;
+					qc->flags |= ATA_QCFLAG_FAILED;
+					nr_timedout++;
+				}
+			} else {
+				/* Normal completion occurred after
+				 * SCSI timeout but before this point.
+				 * Successfully complete it.
+				 */
+				scmd->retries = scmd->allowed;
+				scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+			}
+		}
+
+		/* If we have timed out qcs.  They belong to EH from
+		 * this point but the state of the controller is
+		 * unknown.  Freeze the port to make sure the IRQ
+		 * handler doesn't diddle with those qcs.  This must
+		 * be done atomically w.r.t. setting QCFLAG_FAILED.
+		 */
+		if (nr_timedout)
+			__ata_port_freeze(ap);
+
+		spin_unlock_irqrestore(ap_lock, flags);
+	} else
+		spin_unlock_wait(ap_lock);
+
+ repeat:
+	/* invoke error handler */
+	if (ap->ops->error_handler) {
+		/* fetch & clear EH info */
+		spin_lock_irqsave(ap_lock, flags);
+
+		memset(&ap->eh_context, 0, sizeof(ap->eh_context));
+		ap->eh_context.i = ap->eh_info;
+		memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+		ap->flags |= ATA_FLAG_EH_IN_PROGRESS;
+		ap->flags &= ~ATA_FLAG_EH_PENDING;
+
+		spin_unlock_irqrestore(ap_lock, flags);
+
+		/* invoke EH.  if unloading, just finish failed qcs */
+		if (!(ap->flags & ATA_FLAG_UNLOADING))
+			ap->ops->error_handler(ap);
+		else
+			ata_eh_finish(ap);
+
+		/* Exception might have happend after ->error_handler
+		 * recovered the port but before this point.  Repeat
+		 * EH in such case.
+		 */
+		spin_lock_irqsave(ap_lock, flags);
+
+		if (ap->flags & ATA_FLAG_EH_PENDING) {
+			if (--repeat_cnt) {
+				ata_port_printk(ap, KERN_INFO,
+					"EH pending after completion, "
+					"repeating EH (cnt=%d)\n", repeat_cnt);
+				spin_unlock_irqrestore(ap_lock, flags);
+				goto repeat;
+			}
+			ata_port_printk(ap, KERN_ERR, "EH pending after %d "
+					"tries, giving up\n", ATA_EH_MAX_REPEAT);
+		}
+
+		/* this run is complete, make sure EH info is clear */
+		memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+		/* Clear host_eh_scheduled while holding ap_lock such
+		 * that if exception occurs after this point but
+		 * before EH completion, SCSI midlayer will
+		 * re-initiate EH.
+		 */
+		host->host_eh_scheduled = 0;
+
+		spin_unlock_irqrestore(ap_lock, flags);
+	} else {
+		WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
+		ap->ops->eng_timeout(ap);
+	}
+
+	/* finish or retry handled scmd's and clean up */
+	WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
+
+	scsi_eh_flush_done_q(&ap->eh_done_q);
+
+	/* clean up */
+	spin_lock_irqsave(ap_lock, flags);
+
+	if (ap->flags & ATA_FLAG_LOADING) {
+		ap->flags &= ~ATA_FLAG_LOADING;
+	} else {
+		if (ap->flags & ATA_FLAG_SCSI_HOTPLUG)
+			queue_work(ata_aux_wq, &ap->hotplug_task);
+		if (ap->flags & ATA_FLAG_RECOVERED)
+			ata_port_printk(ap, KERN_INFO, "EH complete\n");
+	}
+
+	ap->flags &= ~(ATA_FLAG_SCSI_HOTPLUG | ATA_FLAG_RECOVERED);
+
+	/* tell wait_eh that we're done */
+	ap->flags &= ~ATA_FLAG_EH_IN_PROGRESS;
+	wake_up_all(&ap->eh_wait_q);
+
+	spin_unlock_irqrestore(ap_lock, flags);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_port_wait_eh - Wait for the currently pending EH to complete
+ *	@ap: Port to wait EH for
+ *
+ *	Wait until the currently pending EH is complete.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_port_wait_eh(struct ata_port *ap)
+{
+	unsigned long flags;
+	DEFINE_WAIT(wait);
+
+ retry:
+	spin_lock_irqsave(ap->lock, flags);
+
+	while (ap->flags & (ATA_FLAG_EH_PENDING | ATA_FLAG_EH_IN_PROGRESS)) {
+		prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
+		spin_unlock_irqrestore(ap->lock, flags);
+		schedule();
+		spin_lock_irqsave(ap->lock, flags);
+	}
+	finish_wait(&ap->eh_wait_q, &wait);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* make sure SCSI EH is complete */
+	if (scsi_host_in_recovery(ap->host)) {
+		msleep(10);
+		goto retry;
+	}
+}
+
+/**
+ *	ata_qc_timeout - Handle timeout of queued command
+ *	@qc: Command that timed out
+ *
+ *	Some part of the kernel (currently, only the SCSI layer)
+ *	has noticed that the active command on port @ap has not
+ *	completed after a specified length of time.  Handle this
+ *	condition by disabling DMA (if necessary) and completing
+ *	transactions, with error if necessary.
+ *
+ *	This also handles the case of the "lost interrupt", where
+ *	for some reason (possibly hardware bug, possibly driver bug)
+ *	an interrupt was not delivered to the driver, even though the
+ *	transaction completed successfully.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ */
+static void ata_qc_timeout(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	u8 host_stat = 0, drv_stat;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	ap->hsm_task_state = HSM_ST_IDLE;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	switch (qc->tf.protocol) {
+
+	case ATA_PROT_DMA:
+	case ATA_PROT_ATAPI_DMA:
+		host_stat = ap->ops->bmdma_status(ap);
+
+		/* before we do anything else, clear DMA-Start bit */
+		ap->ops->bmdma_stop(qc);
+
+		/* fall through */
+
+	default:
+		ata_altstatus(ap);
+		drv_stat = ata_chk_status(ap);
+
+		/* ack bmdma irq events */
+		ap->ops->irq_clear(ap);
+
+		ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, "
+			       "stat 0x%x host_stat 0x%x\n",
+			       qc->tf.command, drv_stat, host_stat);
+
+		/* complete taskfile transaction */
+		qc->err_mask |= AC_ERR_TIMEOUT;
+		break;
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_eh_qc_complete(qc);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_eng_timeout - Handle timeout of queued command
+ *	@ap: Port on which timed-out command is active
+ *
+ *	Some part of the kernel (currently, only the SCSI layer)
+ *	has noticed that the active command on port @ap has not
+ *	completed after a specified length of time.  Handle this
+ *	condition by disabling DMA (if necessary) and completing
+ *	transactions, with error if necessary.
+ *
+ *	This also handles the case of the "lost interrupt", where
+ *	for some reason (possibly hardware bug, possibly driver bug)
+ *	an interrupt was not delivered to the driver, even though the
+ *	transaction completed successfully.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ */
+void ata_eng_timeout(struct ata_port *ap)
+{
+	DPRINTK("ENTER\n");
+
+	ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_qc_schedule_eh - schedule qc for error handling
+ *	@qc: command to schedule error handling for
+ *
+ *	Schedule error handling for @qc.  EH will kick in as soon as
+ *	other commands are drained.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	qc->flags |= ATA_QCFLAG_FAILED;
+	qc->ap->flags |= ATA_FLAG_EH_PENDING;
+
+	/* The following will fail if timeout has already expired.
+	 * ata_scsi_error() takes care of such scmds on EH entry.
+	 * Note that ATA_QCFLAG_FAILED is unconditionally set after
+	 * this function completes.
+	 */
+	scsi_req_abort_cmd(qc->scsicmd);
+}
+
+/**
+ *	ata_port_schedule_eh - schedule error handling without a qc
+ *	@ap: ATA port to schedule EH for
+ *
+ *	Schedule error handling for @ap.  EH will kick in as soon as
+ *	all commands are drained.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_port_schedule_eh(struct ata_port *ap)
+{
+	WARN_ON(!ap->ops->error_handler);
+
+	ap->flags |= ATA_FLAG_EH_PENDING;
+	scsi_schedule_eh(ap->host);
+
+	DPRINTK("port EH scheduled\n");
+}
+
+/**
+ *	ata_port_abort - abort all qc's on the port
+ *	@ap: ATA port to abort qc's for
+ *
+ *	Abort all active qc's of @ap and schedule EH.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of aborted qc's.
+ */
+int ata_port_abort(struct ata_port *ap)
+{
+	int tag, nr_aborted = 0;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
+
+		if (qc) {
+			qc->flags |= ATA_QCFLAG_FAILED;
+			ata_qc_complete(qc);
+			nr_aborted++;
+		}
+	}
+
+	if (!nr_aborted)
+		ata_port_schedule_eh(ap);
+
+	return nr_aborted;
+}
+
+/**
+ *	__ata_port_freeze - freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	This function is called when HSM violation or some other
+ *	condition disrupts normal operation of the port.  Frozen port
+ *	is not allowed to perform any operation until the port is
+ *	thawed, which usually follows a successful reset.
+ *
+ *	ap->ops->freeze() callback can be used for freezing the port
+ *	hardware-wise (e.g. mask interrupt and stop DMA engine).  If a
+ *	port cannot be frozen hardware-wise, the interrupt handler
+ *	must ack and clear interrupts unconditionally while the port
+ *	is frozen.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+static void __ata_port_freeze(struct ata_port *ap)
+{
+	WARN_ON(!ap->ops->error_handler);
+
+	if (ap->ops->freeze)
+		ap->ops->freeze(ap);
+
+	ap->flags |= ATA_FLAG_FROZEN;
+
+	DPRINTK("ata%u port frozen\n", ap->id);
+}
+
+/**
+ *	ata_port_freeze - abort & freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	Abort and freeze @ap.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of aborted commands.
+ */
+int ata_port_freeze(struct ata_port *ap)
+{
+	int nr_aborted;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	nr_aborted = ata_port_abort(ap);
+	__ata_port_freeze(ap);
+
+	return nr_aborted;
+}
+
+/**
+ *	ata_eh_freeze_port - EH helper to freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	Freeze @ap.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void ata_eh_freeze_port(struct ata_port *ap)
+{
+	unsigned long flags;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+	__ata_port_freeze(ap);
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_port_thaw_port - EH helper to thaw port
+ *	@ap: ATA port to thaw
+ *
+ *	Thaw frozen port @ap.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void ata_eh_thaw_port(struct ata_port *ap)
+{
+	unsigned long flags;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->flags &= ~ATA_FLAG_FROZEN;
+
+	if (ap->ops->thaw)
+		ap->ops->thaw(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	DPRINTK("ata%u port thawed\n", ap->id);
+}
+
+static void ata_eh_scsidone(struct scsi_cmnd *scmd)
+{
+	/* nada */
+}
+
+static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+	qc->scsidone = ata_eh_scsidone;
+	__ata_qc_complete(qc);
+	WARN_ON(ata_tag_valid(qc->tag));
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+}
+
+/**
+ *	ata_eh_qc_complete - Complete an active ATA command from EH
+ *	@qc: Command to complete
+ *
+ *	Indicate to the mid and upper layers that an ATA command has
+ *	completed.  To be used from EH.
+ */
+void ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	scmd->retries = scmd->allowed;
+	__ata_eh_qc_complete(qc);
+}
+
+/**
+ *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
+ *	@qc: Command to retry
+ *
+ *	Indicate to the mid and upper layers that an ATA command
+ *	should be retried.  To be used from EH.
+ *
+ *	SCSI midlayer limits the number of retries to scmd->allowed.
+ *	scmd->retries is decremented for commands which get retried
+ *	due to unrelated failures (qc->err_mask is zero).
+ */
+void ata_eh_qc_retry(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	if (!qc->err_mask && scmd->retries)
+		scmd->retries--;
+	__ata_eh_qc_complete(qc);
+}
+
+/**
+ *	ata_eh_detach_dev - detach ATA device
+ *	@dev: ATA device to detach
+ *
+ *	Detach @dev.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_detach_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	unsigned long flags;
+
+	ata_dev_disable(dev);
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	dev->flags &= ~ATA_DFLAG_DETACH;
+
+	if (ata_scsi_offline_dev(dev)) {
+		dev->flags |= ATA_DFLAG_DETACHED;
+		ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+static void ata_eh_clear_action(struct ata_device *dev,
+				struct ata_eh_info *ehi, unsigned int action)
+{
+	int i;
+
+	if (!dev) {
+		ehi->action &= ~action;
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ehi->dev_action[i] &= ~action;
+	} else {
+		/* doesn't make sense for port-wide EH actions */
+		WARN_ON(!(action & ATA_EH_PERDEV_MASK));
+
+		/* break ehi->action into ehi->dev_action */
+		if (ehi->action & action) {
+			for (i = 0; i < ATA_MAX_DEVICES; i++)
+				ehi->dev_action[i] |= ehi->action & action;
+			ehi->action &= ~action;
+		}
+
+		/* turn off the specified per-dev action */
+		ehi->dev_action[dev->devno] &= ~action;
+	}
+}
+
+/**
+ *	ata_eh_about_to_do - about to perform eh_action
+ *	@ap: target ATA port
+ *	@dev: target ATA dev for per-dev action (can be NULL)
+ *	@action: action about to be performed
+ *
+ *	Called just before performing EH actions to clear related bits
+ *	in @ap->eh_info such that eh actions are not unnecessarily
+ *	repeated.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
+			       unsigned int action)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+	ata_eh_clear_action(dev, &ap->eh_info, action);
+	ap->flags |= ATA_FLAG_RECOVERED;
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_eh_done - EH action complete
+ *	@ap: target ATA port
+ *	@dev: target ATA dev for per-dev action (can be NULL)
+ *	@action: action just completed
+ *
+ *	Called right after performing EH actions to clear related bits
+ *	in @ap->eh_context.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
+			unsigned int action)
+{
+	ata_eh_clear_action(dev, &ap->eh_context.i, action);
+}
+
+/**
+ *	ata_err_string - convert err_mask to descriptive string
+ *	@err_mask: error mask to convert to string
+ *
+ *	Convert @err_mask to descriptive string.  Errors are
+ *	prioritized according to severity and only the most severe
+ *	error is reported.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Descriptive string for @err_mask
+ */
+static const char * ata_err_string(unsigned int err_mask)
+{
+	if (err_mask & AC_ERR_HOST_BUS)
+		return "host bus error";
+	if (err_mask & AC_ERR_ATA_BUS)
+		return "ATA bus error";
+	if (err_mask & AC_ERR_TIMEOUT)
+		return "timeout";
+	if (err_mask & AC_ERR_HSM)
+		return "HSM violation";
+	if (err_mask & AC_ERR_SYSTEM)
+		return "internal error";
+	if (err_mask & AC_ERR_MEDIA)
+		return "media error";
+	if (err_mask & AC_ERR_INVALID)
+		return "invalid argument";
+	if (err_mask & AC_ERR_DEV)
+		return "device error";
+	return "unknown error";
+}
+
+/**
+ *	ata_read_log_page - read a specific log page
+ *	@dev: target device
+ *	@page: page to read
+ *	@buf: buffer to store read page
+ *	@sectors: number of sectors to read
+ *
+ *	Read log page using READ_LOG_EXT command.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_read_log_page(struct ata_device *dev,
+				      u8 page, void *buf, unsigned int sectors)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	DPRINTK("read log page - page %d\n", page);
+
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_READ_LOG_EXT;
+	tf.lbal = page;
+	tf.nsect = sectors;
+	tf.hob_nsect = sectors >> 8;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_PIO;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
+				     buf, sectors * ATA_SECT_SIZE);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	ata_eh_read_log_10h - Read log page 10h for NCQ error details
+ *	@dev: Device to read log page 10h from
+ *	@tag: Resulting tag of the failed command
+ *	@tf: Resulting taskfile registers of the failed command
+ *
+ *	Read log page 10h to obtain NCQ error details and clear error
+ *	condition.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int ata_eh_read_log_10h(struct ata_device *dev,
+			       int *tag, struct ata_taskfile *tf)
+{
+	u8 *buf = dev->ap->sector_buf;
+	unsigned int err_mask;
+	u8 csum;
+	int i;
+
+	err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
+	if (err_mask)
+		return -EIO;
+
+	csum = 0;
+	for (i = 0; i < ATA_SECT_SIZE; i++)
+		csum += buf[i];
+	if (csum)
+		ata_dev_printk(dev, KERN_WARNING,
+			       "invalid checksum 0x%x on log page 10h\n", csum);
+
+	if (buf[0] & 0x80)
+		return -ENOENT;
+
+	*tag = buf[0] & 0x1f;
+
+	tf->command = buf[2];
+	tf->feature = buf[3];
+	tf->lbal = buf[4];
+	tf->lbam = buf[5];
+	tf->lbah = buf[6];
+	tf->device = buf[7];
+	tf->hob_lbal = buf[8];
+	tf->hob_lbam = buf[9];
+	tf->hob_lbah = buf[10];
+	tf->nsect = buf[12];
+	tf->hob_nsect = buf[13];
+
+	return 0;
+}
+
+/**
+ *	atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
+ *	@dev: device to perform REQUEST_SENSE to
+ *	@sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
+ *
+ *	Perform ATAPI REQUEST_SENSE after the device reported CHECK
+ *	SENSE.  This function is EH helper.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask on failure
+ */
+static unsigned int atapi_eh_request_sense(struct ata_device *dev,
+					   unsigned char *sense_buf)
+{
+	struct ata_port *ap = dev->ap;
+	struct ata_taskfile tf;
+	u8 cdb[ATAPI_CDB_LEN];
+
+	DPRINTK("ATAPI request sense\n");
+
+	ata_tf_init(dev, &tf);
+
+	/* FIXME: is this needed? */
+	memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+
+	/* XXX: why tf_read here? */
+	ap->ops->tf_read(ap, &tf);
+
+	/* fill these in, for the case where they are -not- overwritten */
+	sense_buf[0] = 0x70;
+	sense_buf[2] = tf.feature >> 4;
+
+	memset(cdb, 0, ATAPI_CDB_LEN);
+	cdb[0] = REQUEST_SENSE;
+	cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.command = ATA_CMD_PACKET;
+
+	/* is it pointless to prefer PIO for "safety reasons"? */
+	if (ap->flags & ATA_FLAG_PIO_DMA) {
+		tf.protocol = ATA_PROT_ATAPI_DMA;
+		tf.feature |= ATAPI_PKT_DMA;
+	} else {
+		tf.protocol = ATA_PROT_ATAPI;
+		tf.lbam = (8 * 1024) & 0xff;
+		tf.lbah = (8 * 1024) >> 8;
+	}
+
+	return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
+				 sense_buf, SCSI_SENSE_BUFFERSIZE);
+}
+
+/**
+ *	ata_eh_analyze_serror - analyze SError for a failed port
+ *	@ap: ATA port to analyze SError for
+ *
+ *	Analyze SError if available and further determine cause of
+ *	failure.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_analyze_serror(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	u32 serror = ehc->i.serror;
+	unsigned int err_mask = 0, action = 0;
+
+	if (serror & SERR_PERSISTENT) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_HARDRESET;
+	}
+	if (serror &
+	    (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & SERR_PROTOCOL) {
+		err_mask |= AC_ERR_HSM;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & SERR_INTERNAL) {
+		err_mask |= AC_ERR_SYSTEM;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
+		ata_ehi_hotplugged(&ehc->i);
+
+	ehc->i.err_mask |= err_mask;
+	ehc->i.action |= action;
+}
+
+/**
+ *	ata_eh_analyze_ncq_error - analyze NCQ error
+ *	@ap: ATA port to analyze NCQ error for
+ *
+ *	Read log page 10h, determine the offending qc and acquire
+ *	error status TF.  For NCQ device errors, all LLDDs have to do
+ *	is setting AC_ERR_DEV in ehi->err_mask.  This function takes
+ *	care of the rest.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_analyze_ncq_error(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev = ap->device;
+	struct ata_queued_cmd *qc;
+	struct ata_taskfile tf;
+	int tag, rc;
+
+	/* if frozen, we can't do much */
+	if (ap->flags & ATA_FLAG_FROZEN)
+		return;
+
+	/* is it NCQ device error? */
+	if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
+		return;
+
+	/* has LLDD analyzed already? */
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		if (qc->err_mask)
+			return;
+	}
+
+	/* okay, this error is ours */
+	rc = ata_eh_read_log_10h(dev, &tag, &tf);
+	if (rc) {
+		ata_port_printk(ap, KERN_ERR, "failed to read log page 10h "
+				"(errno=%d)\n", rc);
+		return;
+	}
+
+	if (!(ap->sactive & (1 << tag))) {
+		ata_port_printk(ap, KERN_ERR, "log page 10h reported "
+				"inactive tag %d\n", tag);
+		return;
+	}
+
+	/* we've got the perpetrator, condemn it */
+	qc = __ata_qc_from_tag(ap, tag);
+	memcpy(&qc->result_tf, &tf, sizeof(tf));
+	qc->err_mask |= AC_ERR_DEV;
+	ehc->i.err_mask &= ~AC_ERR_DEV;
+}
+
+/**
+ *	ata_eh_analyze_tf - analyze taskfile of a failed qc
+ *	@qc: qc to analyze
+ *	@tf: Taskfile registers to analyze
+ *
+ *	Analyze taskfile of @qc and further determine cause of
+ *	failure.  This function also requests ATAPI sense data if
+ *	avaliable.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	Determined recovery action
+ */
+static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
+				      const struct ata_taskfile *tf)
+{
+	unsigned int tmp, action = 0;
+	u8 stat = tf->command, err = tf->feature;
+
+	if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
+		qc->err_mask |= AC_ERR_HSM;
+		return ATA_EH_SOFTRESET;
+	}
+
+	if (!(qc->err_mask & AC_ERR_DEV))
+		return 0;
+
+	switch (qc->dev->class) {
+	case ATA_DEV_ATA:
+		if (err & ATA_ICRC)
+			qc->err_mask |= AC_ERR_ATA_BUS;
+		if (err & ATA_UNC)
+			qc->err_mask |= AC_ERR_MEDIA;
+		if (err & ATA_IDNF)
+			qc->err_mask |= AC_ERR_INVALID;
+		break;
+
+	case ATA_DEV_ATAPI:
+		tmp = atapi_eh_request_sense(qc->dev,
+					     qc->scsicmd->sense_buffer);
+		if (!tmp) {
+			/* ATA_QCFLAG_SENSE_VALID is used to tell
+			 * atapi_qc_complete() that sense data is
+			 * already valid.
+			 *
+			 * TODO: interpret sense data and set
+			 * appropriate err_mask.
+			 */
+			qc->flags |= ATA_QCFLAG_SENSE_VALID;
+		} else
+			qc->err_mask |= tmp;
+	}
+
+	if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
+		action |= ATA_EH_SOFTRESET;
+
+	return action;
+}
+
+static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent)
+{
+	if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT))
+		return 1;
+
+	if (ent->is_io) {
+		if (ent->err_mask & AC_ERR_HSM)
+			return 1;
+		if ((ent->err_mask &
+		     (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
+			return 2;
+	}
+
+	return 0;
+}
+
+struct speed_down_needed_arg {
+	u64 since;
+	int nr_errors[3];
+};
+
+static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg)
+{
+	struct speed_down_needed_arg *arg = void_arg;
+
+	if (ent->timestamp < arg->since)
+		return -1;
+
+	arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++;
+	return 0;
+}
+
+/**
+ *	ata_eh_speed_down_needed - Determine wheter speed down is necessary
+ *	@dev: Device of interest
+ *
+ *	This function examines error ring of @dev and determines
+ *	whether speed down is necessary.  Speed down is necessary if
+ *	there have been more than 3 of Cat-1 errors or 10 of Cat-2
+ *	errors during last 15 minutes.
+ *
+ *	Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM
+ *	violation for known supported commands.
+ *
+ *	Cat-2 errors are unclassified DEV error for known supported
+ *	command.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if speed down is necessary, 0 otherwise
+ */
+static int ata_eh_speed_down_needed(struct ata_device *dev)
+{
+	const u64 interval = 15LLU * 60 * HZ;
+	static const int err_limits[3] = { -1, 3, 10 };
+	struct speed_down_needed_arg arg;
+	struct ata_ering_entry *ent;
+	int err_cat;
+	u64 j64;
+
+	ent = ata_ering_top(&dev->ering);
+	if (!ent)
+		return 0;
+
+	err_cat = ata_eh_categorize_ering_entry(ent);
+	if (err_cat == 0)
+		return 0;
+
+	memset(&arg, 0, sizeof(arg));
+
+	j64 = get_jiffies_64();
+	if (j64 >= interval)
+		arg.since = j64 - interval;
+	else
+		arg.since = 0;
+
+	ata_ering_map(&dev->ering, speed_down_needed_cb, &arg);
+
+	return arg.nr_errors[err_cat] > err_limits[err_cat];
+}
+
+/**
+ *	ata_eh_speed_down - record error and speed down if necessary
+ *	@dev: Failed device
+ *	@is_io: Did the device fail during normal IO?
+ *	@err_mask: err_mask of the error
+ *
+ *	Record error and examine error history to determine whether
+ *	adjusting transmission speed is necessary.  It also sets
+ *	transmission limits appropriately if such adjustment is
+ *	necessary.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+static int ata_eh_speed_down(struct ata_device *dev, int is_io,
+			     unsigned int err_mask)
+{
+	if (!err_mask)
+		return 0;
+
+	/* record error and determine whether speed down is necessary */
+	ata_ering_record(&dev->ering, is_io, err_mask);
+
+	if (!ata_eh_speed_down_needed(dev))
+		return 0;
+
+	/* speed down SATA link speed if possible */
+	if (sata_down_spd_limit(dev->ap) == 0)
+		return ATA_EH_HARDRESET;
+
+	/* lower transfer mode */
+	if (ata_down_xfermask_limit(dev, 0) == 0)
+		return ATA_EH_SOFTRESET;
+
+	ata_dev_printk(dev, KERN_ERR,
+		       "speed down requested but no transfer mode left\n");
+	return 0;
+}
+
+/**
+ *	ata_eh_autopsy - analyze error and determine recovery action
+ *	@ap: ATA port to perform autopsy on
+ *
+ *	Analyze why @ap failed and determine which recovery action is
+ *	needed.  This function also sets more detailed AC_ERR_* values
+ *	and fills sense data for ATAPI CHECK SENSE.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_autopsy(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned int action = ehc->i.action;
+	struct ata_device *failed_dev = NULL;
+	unsigned int all_err_mask = 0;
+	int tag, is_io = 0;
+	u32 serror;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	/* obtain and analyze SError */
+	rc = sata_scr_read(ap, SCR_ERROR, &serror);
+	if (rc == 0) {
+		ehc->i.serror |= serror;
+		ata_eh_analyze_serror(ap);
+	} else if (rc != -EOPNOTSUPP)
+		action |= ATA_EH_HARDRESET;
+
+	/* analyze NCQ failure */
+	ata_eh_analyze_ncq_error(ap);
+
+	/* any real error trumps AC_ERR_OTHER */
+	if (ehc->i.err_mask & ~AC_ERR_OTHER)
+		ehc->i.err_mask &= ~AC_ERR_OTHER;
+
+	all_err_mask |= ehc->i.err_mask;
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		/* inherit upper level err_mask */
+		qc->err_mask |= ehc->i.err_mask;
+
+		/* analyze TF */
+		action |= ata_eh_analyze_tf(qc, &qc->result_tf);
+
+		/* DEV errors are probably spurious in case of ATA_BUS error */
+		if (qc->err_mask & AC_ERR_ATA_BUS)
+			qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
+					  AC_ERR_INVALID);
+
+		/* any real error trumps unknown error */
+		if (qc->err_mask & ~AC_ERR_OTHER)
+			qc->err_mask &= ~AC_ERR_OTHER;
+
+		/* SENSE_VALID trumps dev/unknown error and revalidation */
+		if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+			qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
+			action &= ~ATA_EH_REVALIDATE;
+		}
+
+		/* accumulate error info */
+		failed_dev = qc->dev;
+		all_err_mask |= qc->err_mask;
+		if (qc->flags & ATA_QCFLAG_IO)
+			is_io = 1;
+	}
+
+	/* enforce default EH actions */
+	if (ap->flags & ATA_FLAG_FROZEN ||
+	    all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
+		action |= ATA_EH_SOFTRESET;
+	else if (all_err_mask)
+		action |= ATA_EH_REVALIDATE;
+
+	/* if we have offending qcs and the associated failed device */
+	if (failed_dev) {
+		/* speed down */
+		action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
+
+		/* perform per-dev EH action only on the offending device */
+		ehc->i.dev_action[failed_dev->devno] |=
+			action & ATA_EH_PERDEV_MASK;
+		action &= ~ATA_EH_PERDEV_MASK;
+	}
+
+	/* record autopsy result */
+	ehc->i.dev = failed_dev;
+	ehc->i.action = action;
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_eh_report - report error handling to user
+ *	@ap: ATA port EH is going on
+ *
+ *	Report EH to user.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_report(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	const char *frozen, *desc;
+	int tag, nr_failed = 0;
+
+	desc = NULL;
+	if (ehc->i.desc[0] != '\0')
+		desc = ehc->i.desc;
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+		if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
+			continue;
+
+		nr_failed++;
+	}
+
+	if (!nr_failed && !ehc->i.err_mask)
+		return;
+
+	frozen = "";
+	if (ap->flags & ATA_FLAG_FROZEN)
+		frozen = " frozen";
+
+	if (ehc->i.dev) {
+		ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
+			       "SAct 0x%x SErr 0x%x action 0x%x%s\n",
+			       ehc->i.err_mask, ap->sactive, ehc->i.serror,
+			       ehc->i.action, frozen);
+		if (desc)
+			ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc);
+	} else {
+		ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x "
+				"SAct 0x%x SErr 0x%x action 0x%x%s\n",
+				ehc->i.err_mask, ap->sactive, ehc->i.serror,
+				ehc->i.action, frozen);
+		if (desc)
+			ata_port_printk(ap, KERN_ERR, "(%s)\n", desc);
+	}
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
+			continue;
+
+		ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x "
+			       "Emask 0x%x stat 0x%x err 0x%x (%s)\n",
+			       qc->tag, qc->tf.command, qc->err_mask,
+			       qc->result_tf.command, qc->result_tf.feature,
+			       ata_err_string(qc->err_mask));
+	}
+}
+
+static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
+			unsigned int *classes)
+{
+	int i, rc;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		classes[i] = ATA_DEV_UNKNOWN;
+
+	rc = reset(ap, classes);
+	if (rc)
+		return rc;
+
+	/* If any class isn't ATA_DEV_UNKNOWN, consider classification
+	 * is complete and convert all ATA_DEV_UNKNOWN to
+	 * ATA_DEV_NONE.
+	 */
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (classes[i] != ATA_DEV_UNKNOWN)
+			break;
+
+	if (i < ATA_MAX_DEVICES)
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			if (classes[i] == ATA_DEV_UNKNOWN)
+				classes[i] = ATA_DEV_NONE;
+
+	return 0;
+}
+
+static int ata_eh_followup_srst_needed(int rc, int classify,
+				       const unsigned int *classes)
+{
+	if (rc == -EAGAIN)
+		return 1;
+	if (rc != 0)
+		return 0;
+	if (classify && classes[0] == ATA_DEV_UNKNOWN)
+		return 1;
+	return 0;
+}
+
+static int ata_eh_reset(struct ata_port *ap, int classify,
+			ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+			ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned int *classes = ehc->classes;
+	int tries = ATA_EH_RESET_TRIES;
+	int verbose = !(ap->flags & ATA_FLAG_LOADING);
+	unsigned int action;
+	ata_reset_fn_t reset;
+	int i, did_followup_srst, rc;
+
+	/* Determine which reset to use and record in ehc->i.action.
+	 * prereset() may examine and modify it.
+	 */
+	action = ehc->i.action;
+	ehc->i.action &= ~ATA_EH_RESET_MASK;
+	if (softreset && (!hardreset || (!sata_set_spd_needed(ap) &&
+					 !(action & ATA_EH_HARDRESET))))
+		ehc->i.action |= ATA_EH_SOFTRESET;
+	else
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	if (prereset) {
+		rc = prereset(ap);
+		if (rc) {
+			ata_port_printk(ap, KERN_ERR,
+					"prereset failed (errno=%d)\n", rc);
+			return rc;
+		}
+	}
+
+	/* prereset() might have modified ehc->i.action */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		reset = hardreset;
+	else if (ehc->i.action & ATA_EH_SOFTRESET)
+		reset = softreset;
+	else {
+		/* prereset told us not to reset, bang classes and return */
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			classes[i] = ATA_DEV_NONE;
+		return 0;
+	}
+
+	/* did prereset() screw up?  if so, fix up to avoid oopsing */
+	if (!reset) {
+		ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested "
+				"invalid reset type\n");
+		if (softreset)
+			reset = softreset;
+		else
+			reset = hardreset;
+	}
+
+ retry:
+	/* shut up during boot probing */
+	if (verbose)
+		ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
+				reset == softreset ? "soft" : "hard");
+
+	/* reset */
+	ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
+	ehc->i.flags |= ATA_EHI_DID_RESET;
+
+	rc = ata_do_reset(ap, reset, classes);
+
+	did_followup_srst = 0;
+	if (reset == hardreset &&
+	    ata_eh_followup_srst_needed(rc, classify, classes)) {
+		/* okay, let's do follow-up softreset */
+		did_followup_srst = 1;
+		reset = softreset;
+
+		if (!reset) {
+			ata_port_printk(ap, KERN_ERR,
+					"follow-up softreset required "
+					"but no softreset avaliable\n");
+			return -EINVAL;
+		}
+
+		ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
+		rc = ata_do_reset(ap, reset, classes);
+
+		if (rc == 0 && classify &&
+		    classes[0] == ATA_DEV_UNKNOWN) {
+			ata_port_printk(ap, KERN_ERR,
+					"classification failed\n");
+			return -EINVAL;
+		}
+	}
+
+	if (rc && --tries) {
+		const char *type;
+
+		if (reset == softreset) {
+			if (did_followup_srst)
+				type = "follow-up soft";
+			else
+				type = "soft";
+		} else
+			type = "hard";
+
+		ata_port_printk(ap, KERN_WARNING,
+				"%sreset failed, retrying in 5 secs\n", type);
+		ssleep(5);
+
+		if (reset == hardreset)
+			sata_down_spd_limit(ap);
+		if (hardreset)
+			reset = hardreset;
+		goto retry;
+	}
+
+	if (rc == 0) {
+		/* After the reset, the device state is PIO 0 and the
+		 * controller state is undefined.  Record the mode.
+		 */
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ap->device[i].pio_mode = XFER_PIO_0;
+
+		if (postreset)
+			postreset(ap, classes);
+
+		/* reset successful, schedule revalidation */
+		ata_eh_done(ap, NULL, ATA_EH_RESET_MASK);
+		ehc->i.action |= ATA_EH_REVALIDATE;
+	}
+
+	return rc;
+}
+
+static int ata_eh_revalidate_and_attach(struct ata_port *ap,
+					struct ata_device **r_failed_dev)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev;
+	unsigned long flags;
+	int i, rc = 0;
+
+	DPRINTK("ENTER\n");
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned int action;
+
+		dev = &ap->device[i];
+		action = ehc->i.action | ehc->i.dev_action[dev->devno];
+
+		if (action & ATA_EH_REVALIDATE && ata_dev_enabled(dev)) {
+			if (ata_port_offline(ap)) {
+				rc = -EIO;
+				break;
+			}
+
+			ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
+			rc = ata_dev_revalidate(dev,
+					ehc->i.flags & ATA_EHI_DID_RESET);
+			if (rc)
+				break;
+
+			ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
+
+			/* schedule the scsi_rescan_device() here */
+			queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
+		} else if (dev->class == ATA_DEV_UNKNOWN &&
+			   ehc->tries[dev->devno] &&
+			   ata_class_enabled(ehc->classes[dev->devno])) {
+			dev->class = ehc->classes[dev->devno];
+
+			rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
+			if (rc == 0)
+				rc = ata_dev_configure(dev, 1);
+
+			if (rc) {
+				dev->class = ATA_DEV_UNKNOWN;
+				break;
+			}
+
+			spin_lock_irqsave(ap->lock, flags);
+			ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
+			spin_unlock_irqrestore(ap->lock, flags);
+		}
+	}
+
+	if (rc)
+		*r_failed_dev = dev;
+
+	DPRINTK("EXIT\n");
+	return rc;
+}
+
+static int ata_port_nr_enabled(struct ata_port *ap)
+{
+	int i, cnt = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ata_dev_enabled(&ap->device[i]))
+			cnt++;
+	return cnt;
+}
+
+static int ata_port_nr_vacant(struct ata_port *ap)
+{
+	int i, cnt = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ap->device[i].class == ATA_DEV_UNKNOWN)
+			cnt++;
+	return cnt;
+}
+
+static int ata_eh_skip_recovery(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	int i;
+
+	if (ap->flags & ATA_FLAG_FROZEN || ata_port_nr_enabled(ap))
+		return 0;
+
+	/* skip if class codes for all vacant slots are ATA_DEV_NONE */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+
+		if (dev->class == ATA_DEV_UNKNOWN &&
+		    ehc->classes[dev->devno] != ATA_DEV_NONE)
+			return 0;
+	}
+
+	return 1;
+}
+
+/**
+ *	ata_eh_recover - recover host port after error
+ *	@ap: host port to recover
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	This is the alpha and omega, eum and yang, heart and soul of
+ *	libata exception handling.  On entry, actions required to
+ *	recover the port and hotplug requests are recorded in
+ *	eh_context.  This function executes all the operations with
+ *	appropriate retrials and fallbacks to resurrect failed
+ *	devices, detach goners and greet newcomers.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
+			  ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+			  ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev;
+	int down_xfermask, i, rc;
+
+	DPRINTK("ENTER\n");
+
+	/* prep for recovery */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+
+		/* process hotplug request */
+		if (dev->flags & ATA_DFLAG_DETACH)
+			ata_eh_detach_dev(dev);
+
+		if (!ata_dev_enabled(dev) &&
+		    ((ehc->i.probe_mask & (1 << dev->devno)) &&
+		     !(ehc->did_probe_mask & (1 << dev->devno)))) {
+			ata_eh_detach_dev(dev);
+			ata_dev_init(dev);
+			ehc->did_probe_mask |= (1 << dev->devno);
+			ehc->i.action |= ATA_EH_SOFTRESET;
+		}
+	}
+
+ retry:
+	down_xfermask = 0;
+	rc = 0;
+
+	/* if UNLOADING, finish immediately */
+	if (ap->flags & ATA_FLAG_UNLOADING)
+		goto out;
+
+	/* skip EH if possible. */
+	if (ata_eh_skip_recovery(ap))
+		ehc->i.action = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		ehc->classes[i] = ATA_DEV_UNKNOWN;
+
+	/* reset */
+	if (ehc->i.action & ATA_EH_RESET_MASK) {
+		ata_eh_freeze_port(ap);
+
+		rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset,
+				  softreset, hardreset, postreset);
+		if (rc) {
+			ata_port_printk(ap, KERN_ERR,
+					"reset failed, giving up\n");
+			goto out;
+		}
+
+		ata_eh_thaw_port(ap);
+	}
+
+	/* revalidate existing devices and attach new ones */
+	rc = ata_eh_revalidate_and_attach(ap, &dev);
+	if (rc)
+		goto dev_fail;
+
+	/* configure transfer mode if the port has been reset */
+	if (ehc->i.flags & ATA_EHI_DID_RESET) {
+		rc = ata_set_mode(ap, &dev);
+		if (rc) {
+			down_xfermask = 1;
+			goto dev_fail;
+		}
+	}
+
+	goto out;
+
+ dev_fail:
+	switch (rc) {
+	case -ENODEV:
+		/* device missing, schedule probing */
+		ehc->i.probe_mask |= (1 << dev->devno);
+	case -EINVAL:
+		ehc->tries[dev->devno] = 0;
+		break;
+	case -EIO:
+		sata_down_spd_limit(ap);
+	default:
+		ehc->tries[dev->devno]--;
+		if (down_xfermask &&
+		    ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1))
+			ehc->tries[dev->devno] = 0;
+	}
+
+	if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
+		/* disable device if it has used up all its chances */
+		ata_dev_disable(dev);
+
+		/* detach if offline */
+		if (ata_port_offline(ap))
+			ata_eh_detach_dev(dev);
+
+		/* probe if requested */
+		if ((ehc->i.probe_mask & (1 << dev->devno)) &&
+		    !(ehc->did_probe_mask & (1 << dev->devno))) {
+			ata_eh_detach_dev(dev);
+			ata_dev_init(dev);
+
+			ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+			ehc->did_probe_mask |= (1 << dev->devno);
+			ehc->i.action |= ATA_EH_SOFTRESET;
+		}
+	} else {
+		/* soft didn't work?  be haaaaard */
+		if (ehc->i.flags & ATA_EHI_DID_RESET)
+			ehc->i.action |= ATA_EH_HARDRESET;
+		else
+			ehc->i.action |= ATA_EH_SOFTRESET;
+	}
+
+	if (ata_port_nr_enabled(ap)) {
+		ata_port_printk(ap, KERN_WARNING, "failed to recover some "
+				"devices, retrying in 5 secs\n");
+		ssleep(5);
+	} else {
+		/* no device left, repeat fast */
+		msleep(500);
+	}
+
+	goto retry;
+
+ out:
+	if (rc) {
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ata_dev_disable(&ap->device[i]);
+	}
+
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+/**
+ *	ata_eh_finish - finish up EH
+ *	@ap: host port to finish EH for
+ *
+ *	Recovery is complete.  Clean up EH states and retry or finish
+ *	failed qcs.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_finish(struct ata_port *ap)
+{
+	int tag;
+
+	/* retry or finish qcs */
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		if (qc->err_mask) {
+			/* FIXME: Once EH migration is complete,
+			 * generate sense data in this function,
+			 * considering both err_mask and tf.
+			 */
+			if (qc->err_mask & AC_ERR_INVALID)
+				ata_eh_qc_complete(qc);
+			else
+				ata_eh_qc_retry(qc);
+		} else {
+			if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+				ata_eh_qc_complete(qc);
+			} else {
+				/* feed zero TF to sense generation */
+				memset(&qc->result_tf, 0, sizeof(qc->result_tf));
+				ata_eh_qc_retry(qc);
+			}
+		}
+	}
+}
+
+/**
+ *	ata_do_eh - do standard error handling
+ *	@ap: host port to handle error for
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	Perform standard error handling sequence.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+	       ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+	       ata_postreset_fn_t postreset)
+{
+	if (!(ap->flags & ATA_FLAG_LOADING)) {
+		ata_eh_autopsy(ap);
+		ata_eh_report(ap);
+	}
+
+	ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
+	ata_eh_finish(ap);
+}

drivers/scsi/libata-scsi.c

···
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
 #include <scsi/scsi_transport.h>
 #include <linux/libata.h>
 #include <linux/hdreg.h>
···
 #define SECTOR_SIZE	512
 
 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
-static struct ata_device *
-ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
-static void ata_scsi_error(struct Scsi_Host *host);
-enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+					const struct scsi_device *scsidev);
+static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
+					    const struct scsi_device *scsidev);
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+			      unsigned int id, unsigned int lun);
+
 
 #define RW_RECOVERY_MPAGE 0x1
 #define RW_RECOVERY_MPAGE_LEN 12
···
 struct scsi_transport_template ata_scsi_transport_template = {
 	.eh_strategy_handler	= ata_scsi_error,
 	.eh_timed_out		= ata_scsi_timed_out,
+	.user_scan		= ata_scsi_user_scan,
 };
 
 
···
 
 /**
  *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
- *	@ap: ATA port to which the new command is attached
  *	@dev: ATA device to which the new command is attached
  *	@cmd: SCSI command that originated this ATA command
  *	@done: SCSI command completion function
···
  *	RETURNS:
  *	Command allocated, or %NULL if none available.
  */
-struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
-				       struct ata_device *dev,
+struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
 				       struct scsi_cmnd *cmd,
 				       void (*done)(struct scsi_cmnd *))
 {
 	struct ata_queued_cmd *qc;
 
-	qc = ata_qc_new_init(ap, dev);
+	qc = ata_qc_new_init(dev);
 	if (qc) {
 		qc->scsicmd = cmd;
 		qc->scsidone = done;
···
 
 int ata_scsi_device_resume(struct scsi_device *sdev)
 {
-	struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
-	struct ata_device *dev = &ap->device[sdev->id];
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
 
-	return ata_device_resume(ap, dev);
+	return ata_device_resume(dev);
 }
 
 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
 {
-	struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
-	struct ata_device *dev = &ap->device[sdev->id];
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
 
-	return ata_device_suspend(ap, dev, state);
+	return ata_device_suspend(dev, state);
 }
 
 /**
···
  *	@sk: the sense key we'll fill out
  *	@asc: the additional sense code we'll fill out
  *	@ascq: the additional sense code qualifier we'll fill out
+ *	@verbose: be verbose
  *
  *	Converts an ATA error into a SCSI error.  Fill out pointers to
  *	SK, ASC, and ASCQ bytes for later use in fixed or descriptor
···
  *	spin_lock_irqsave(host_set lock)
  */
 void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
-			u8 *ascq)
+			u8 *ascq, int verbose)
 {
 	int i;
 
···
 			}
 		}
 		/* No immediate match */
-		printk(KERN_WARNING "ata%u: no sense translation for "
-		       "error 0x%02x\n", id, drv_err);
+		if (verbose)
+			printk(KERN_WARNING "ata%u: no sense translation for "
+			       "error 0x%02x\n", id, drv_err);
 	}
 
 	/* Fall back to interpreting status bits */
···
 		}
 	}
 	/* No error?  Undecoded? */
-	printk(KERN_WARNING "ata%u: no sense translation for status: 0x%02x\n",
-	       id, drv_stat);
+	if (verbose)
+		printk(KERN_WARNING "ata%u: no sense translation for "
+		       "status: 0x%02x\n", id, drv_stat);
 
 	/* We need a sensible error return here, which is tricky, and one
 	   that won't cause people to do things like return a disk wrongly */
···
 	*ascq = 0x00;
 
  translate_done:
-	printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x to "
-	       "SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", id, drv_stat, drv_err,
-	       *sk, *asc, *ascq);
+	if (verbose)
+		printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
+		       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
+		       id, drv_stat, drv_err, *sk, *asc, *ascq);
 	return;
 }
 
···
 void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
 {
 	struct scsi_cmnd *cmd = qc->scsicmd;
-	struct ata_taskfile *tf = &qc->tf;
+	struct ata_taskfile *tf = &qc->result_tf;
 	unsigned char *sb = cmd->sense_buffer;
 	unsigned char *desc = sb + 8;
+	int verbose = qc->ap->ops->error_handler == NULL;
 
 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 
 	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 
 	/*
-	 * Read the controller registers.
-	 */
-	WARN_ON(qc->ap->ops->tf_read == NULL);
-	qc->ap->ops->tf_read(qc->ap, tf);
-
-	/*
 	 * Use ata_to_sense_error() to map status register bits
 	 * onto sense key, asc & ascq.
 	 */
-	if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
 		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
-				   &sb[1], &sb[2], &sb[3]);
+				   &sb[1], &sb[2], &sb[3], verbose);
 		sb[1] &= 0x0f;
 	}
 
···
 void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
 {
 	struct scsi_cmnd *cmd = qc->scsicmd;
-	struct ata_taskfile *tf = &qc->tf;
+	struct ata_taskfile *tf = &qc->result_tf;
 	unsigned char *sb = cmd->sense_buffer;
+	int verbose = qc->ap->ops->error_handler == NULL;
 
 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 
 	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 
 	/*
-	 * Read the controller registers.
-	 */
-	WARN_ON(qc->ap->ops->tf_read == NULL);
-	qc->ap->ops->tf_read(qc->ap, tf);
-
-	/*
 	 * Use ata_to_sense_error() to map status register bits
 	 * onto sense key, asc & ascq.
 	 */
-	if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
 		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
-				   &sb[2], &sb[12], &sb[13]);
+				   &sb[2], &sb[12], &sb[13], verbose);
 		sb[2] &= 0x0f;
 	}
 
···
 	 */
 	max_sectors = ATA_MAX_SECTORS;
 	if (dev->flags & ATA_DFLAG_LBA48)
-		max_sectors = 2048;
+		max_sectors = ATA_MAX_SECTORS_LBA48;
 	if (dev->max_sectors)
 		max_sectors = dev->max_sectors;
 
···
 	if (dev->class == ATA_DEV_ATAPI) {
 		request_queue_t *q = sdev->request_queue;
 		blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
+	}
+
+	if (dev->flags & ATA_DFLAG_NCQ) {
+		int depth;
+
+		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+		depth = min(ATA_MAX_QUEUE - 1, depth);
+		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
 	}
 }
 
···
 
 int ata_scsi_slave_config(struct scsi_device *sdev)
 {
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+
 	ata_scsi_sdev_config(sdev);
 
 	blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
 
-	if (sdev->id < ATA_MAX_DEVICES) {
-		struct ata_port *ap;
-		struct ata_device *dev;
-
-		ap = (struct ata_port *) &sdev->host->hostdata[0];
-		dev = &ap->device[sdev->id];
-
+	if (dev)
 		ata_scsi_dev_config(sdev, dev);
-	}
 
 	return 0;	/* scsi layer doesn't check return value, sigh */
 }
 
 /**
- *	ata_scsi_timed_out - SCSI layer time out callback
- *	@cmd: timed out SCSI command
+ *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
+ *	@sdev: SCSI device to be destroyed
  *
- *	Handles SCSI layer timeout.  We race with normal completion of
- *	the qc for @cmd.  If the qc is already gone, we lose and let
- *	the scsi command finish (EH_HANDLED).  Otherwise, the qc has
- *	timed out and EH should be invoked.  Prevent ata_qc_complete()
- *	from finishing it by setting EH_SCHEDULED and return
- *	EH_NOT_HANDLED.
+ *	@sdev is about to be destroyed for hot/warm unplugging.  If
+ *	this unplugging was initiated by libata as indicated by NULL
+ *	dev->sdev, this function doesn't have to do anything.
+ *	Otherwise, SCSI layer initiated warm-unplug is in progress.
+ *	Clear dev->sdev, schedule the device for ATA detach and invoke
+ *	EH.
  *
  *	LOCKING:
- *	Called from timer context
+ *	Defined by SCSI layer.  We don't really care.
+ */
+void ata_scsi_slave_destroy(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	unsigned long flags;
+	struct ata_device *dev;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+	dev = __ata_scsi_find_dev(ap, sdev);
+	if (dev && dev->sdev) {
+		/* SCSI device already in CANCEL state, no need to offline it */
+		dev->sdev = NULL;
+		dev->flags |= ATA_DFLAG_DETACH;
+		ata_port_schedule_eh(ap);
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	This is libata standard hostt->change_queue_depth callback.
+ *	SCSI will call into this callback when user tries to set queue
+ *	depth via sysfs.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
  *
  *	RETURNS:
- *	EH_HANDLED or EH_NOT_HANDLED
+ *	Newly configured queue depth.
  */
-enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
 {
-	struct Scsi_Host *host = cmd->device->host;
-	struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
-	unsigned long flags;
-	struct ata_queued_cmd *qc;
-	enum scsi_eh_timer_return ret = EH_HANDLED;
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev;
+	int max_depth;
 
-	DPRINTK("ENTER\n");
+	if (queue_depth < 1)
+		return sdev->queue_depth;
 
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	if (qc) {
-		WARN_ON(qc->scsicmd != cmd);
-		qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
-		qc->err_mask |= AC_ERR_TIMEOUT;
-		ret = EH_NOT_HANDLED;
-	}
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev || !ata_dev_enabled(dev))
+		return sdev->queue_depth;
 
-	DPRINTK("EXIT, ret=%d\n", ret);
-	return ret;
-}
+	max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+	max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
+	if (queue_depth > max_depth)
+		queue_depth = max_depth;
 
-/**
- *	ata_scsi_error - SCSI layer error handler callback
- *	@host: SCSI host on which error occurred
- *
- *	Handles SCSI-layer-thrown error events.
- *
- *	LOCKING:
- *	Inherited from SCSI layer (none, can sleep)
- */
-
-static void ata_scsi_error(struct Scsi_Host *host)
-{
-	struct ata_port *ap;
-	unsigned long flags;
-
-	DPRINTK("ENTER\n");
-
-	ap = (struct ata_port *) &host->hostdata[0];
-
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-	WARN_ON(ap->flags & ATA_FLAG_IN_EH);
-	ap->flags |= ATA_FLAG_IN_EH;
-	WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
-	ata_port_flush_task(ap);
-
-	ap->ops->eng_timeout(ap);
-
-	WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
-
-	scsi_eh_flush_done_q(&ap->eh_done_q);
-
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-	ap->flags &= ~ATA_FLAG_IN_EH;
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
-	DPRINTK("EXIT\n");
-}
-
-static void ata_eh_scsidone(struct scsi_cmnd *scmd)
-{
-	/* nada */
-}
-
-static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
-{
-	struct ata_port *ap = qc->ap;
-	struct scsi_cmnd *scmd = qc->scsicmd;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ap->host_set->lock, flags);
-	qc->scsidone = ata_eh_scsidone;
-	__ata_qc_complete(qc);
-	WARN_ON(ata_tag_valid(qc->tag));
-	spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
-	scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
-}
-
-/**
- *	ata_eh_qc_complete - Complete an active ATA command from EH
- *	@qc: Command to complete
- *
- *	Indicate to the mid and upper layers that an ATA command has
- *	completed.  To be used from EH.
- */
-void ata_eh_qc_complete(struct ata_queued_cmd *qc)
-{
-	struct scsi_cmnd *scmd = qc->scsicmd;
-	scmd->retries = scmd->allowed;
-	__ata_eh_qc_complete(qc);
-}
-
-/**
- *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
- *	@qc: Command to retry
- *
- *	Indicate to the mid and upper layers that an ATA command
- *	should be retried.  To be used from EH.
- *
- *	SCSI midlayer limits the number of retries to scmd->allowed.
- *	This function might need to adjust scmd->retries for commands
- *	which get retried due to unrelated NCQ failures.
- */
-void ata_eh_qc_retry(struct ata_queued_cmd *qc)
-{
-	__ata_eh_qc_complete(qc);
+	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+	return queue_depth;
 }
 
 /**
···
 		tf->nsect = 1;	/* 1 sector, lba=0 */
 
 		if (qc->dev->flags & ATA_DFLAG_LBA) {
-			qc->tf.flags |= ATA_TFLAG_LBA;
+			tf->flags |= ATA_TFLAG_LBA;
 
 			tf->lbah = 0x0;
 			tf->lbam = 0x0;
···
 	u64 block;
 	u32 n_block;
 
+	qc->flags |= ATA_QCFLAG_IO;
 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 
 	if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
···
 		 */
 		goto nothing_to_do;
 
-	if (dev->flags & ATA_DFLAG_LBA) {
+	if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
+		/* yay, NCQ */
+		if (!lba_48_ok(block, n_block))
+			goto out_of_range;
+
+		tf->protocol = ATA_PROT_NCQ;
+		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+
+		if (tf->flags & ATA_TFLAG_WRITE)
+			tf->command = ATA_CMD_FPDMA_WRITE;
+		else
+			tf->command = ATA_CMD_FPDMA_READ;
+
+		qc->nsect = n_block;
+
+		tf->nsect = qc->tag << 3;
+		tf->hob_feature = (n_block >> 8) & 0xff;
+		tf->feature = n_block & 0xff;
+
+		tf->hob_lbah = (block >> 40) & 0xff;
+		tf->hob_lbam = (block >> 32) & 0xff;
+		tf->hob_lbal = (block >> 24) & 0xff;
+		tf->lbah = (block >> 16) & 0xff;
+		tf->lbam = (block >> 8) & 0xff;
+		tf->lbal = block & 0xff;
+
+		tf->device = 1 << 6;
+		if (tf->flags & ATA_TFLAG_FUA)
+			tf->device |= 1 << 7;
+	} else if (dev->flags & ATA_DFLAG_LBA) {
 		tf->flags |= ATA_TFLAG_LBA;
 
 		if (lba_28_ok(block, n_block)) {
···
 	u8 *cdb = cmd->cmnd;
  	int need_sense = (qc->err_mask != 0);
 
+	/* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
+	 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
+	 * cache
+	 */
+	if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
+	    ((qc->tf.feature == SETFEATURES_WC_ON) ||
+	     (qc->tf.feature == SETFEATURES_WC_OFF))) {
+		qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
+		ata_port_schedule_eh(qc->ap);
+	}
+
 	/* For ATA pass thru (SAT) commands, generate a sense block if
 	 * user mandated it or if there's an error.  Note that if we
 	 * generate because the user forced us to, a check condition
···
 		}
 	}
 
-	if (need_sense) {
-		/* The ata_gen_..._sense routines fill in tf */
-		ata_dump_status(qc->ap->id, &qc->tf);
-	}
+	if (need_sense && !qc->ap->ops->error_handler)
+		ata_dump_status(qc->ap->id, &qc->result_tf);
 
 	qc->scsidone(cmd);
 
···
 }
 
 /**
+ *	ata_scmd_need_defer - Check whether we need to defer scmd
+ *	@dev: ATA device to which the command is addressed
+ *	@is_io: Is the command IO (and thus possibly NCQ)?
+ *
+ *	NCQ and non-NCQ commands cannot run together.  As upper layer
+ *	only knows the queue depth, we are responsible for maintaining
+ *	exclusion.  This function checks whether a new command can be
+ *	issued to @dev.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	1 if deferring is needed, 0 otherwise.
+ */
+static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
+{
+	struct ata_port *ap = dev->ap;
+
+	if (!(dev->flags & ATA_DFLAG_NCQ))
+		return 0;
+
+	if (is_io) {
+		if (!ata_tag_valid(ap->active_tag))
+			return 0;
+	} else {
+		if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
+			return 0;
+	}
+	return 1;
+}
+
+/**
  *	ata_scsi_translate - Translate then issue SCSI command to ATA device
- *	@ap: ATA port to which the command is addressed
  *	@dev: ATA device to which the command is addressed
  *	@cmd: SCSI command to execute
  *	@done: SCSI command completion function
···
  *
  *	LOCKING:
  *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
+ *	needs to be deferred.
  */
-
-static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
-			      struct scsi_cmnd *cmd,
+static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
 			      void (*done)(struct scsi_cmnd *),
 			      ata_xlat_func_t xlat_func)
 {
 	struct ata_queued_cmd *qc;
 	u8 *scsicmd = cmd->cmnd;
+	int is_io = xlat_func == ata_scsi_rw_xlat;
 
 	VPRINTK("ENTER\n");
 
-	qc = ata_scsi_qc_new(ap, dev, cmd, done);
+	if (unlikely(ata_scmd_need_defer(dev, is_io)))
+		goto defer;
+
+	qc = ata_scsi_qc_new(dev, cmd, done);
 	if (!qc)
 		goto err_mem;
 
···
 	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
 	    cmd->sc_data_direction == DMA_TO_DEVICE) {
 		if (unlikely(cmd->request_bufflen < 1)) {
-			printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
-			       ap->id, dev->devno);
+			ata_dev_printk(dev, KERN_WARNING,
+				       "WARNING: zero len r/w req\n");
 			goto err_did;
 		}
 
···
 	ata_qc_issue(qc);
 
 	VPRINTK("EXIT\n");
-	return;
+	return 0;
 
 early_finish:
         ata_qc_free(qc);
 	done(cmd);
 	DPRINTK("EXIT - early finish (good or error)\n");
-	return;
+	return 0;
 
 err_did:
 	ata_qc_free(qc);
···
 	cmd->result = (DID_ERROR << 16);
 	done(cmd);
 	DPRINTK("EXIT - internal\n");
-	return;
+	return 0;
+
+defer:
+	DPRINTK("EXIT - defer\n");
+	return SCSI_MLQUEUE_DEVICE_BUSY;
 }
 
 /**
···
 		return 0;
 
 	dpofua = 0;
-	if (ata_dev_supports_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
+	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
 	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
 		dpofua = 1 << 4;
 
···
 
 static void atapi_sense_complete(struct ata_queued_cmd *qc)
 {
-	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0))
+	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
 		/* FIXME: not quite right; we don't want the
 		 * translation of taskfile registers into
 		 * a sense descriptors, since that's only
 		 * correct for ATA, not ATAPI
 		 */
 		ata_gen_ata_desc_sense(qc);
+	}
 
 	qc->scsidone(qc->scsicmd);
 	ata_qc_free(qc);
···
 
 	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
 
+	/* handle completion from new EH */
+	if (unlikely(qc->ap->ops->error_handler &&
+		     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
+
+		if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
+			/* FIXME: not quite right; we don't want the
+			 * translation of taskfile registers into a
+			 * sense descriptors, since that's only
+			 * correct for ATA, not ATAPI
+			 */
+			ata_gen_ata_desc_sense(qc);
+		}
+
+		qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
+		qc->scsidone(cmd);
+		ata_qc_free(qc);
+		return;
+	}
+
+	/* successful completion or old EH failure path */
 	if (unlikely(err_mask & AC_ERR_DEV)) {
 		cmd->result = SAM_STAT_CHECK_CONDITION;
 		atapi_request_sense(qc);
 		return;
-	}
-
-	else if (unlikely(err_mask))
+	} else if (unlikely(err_mask)) {
 		/* FIXME: not quite right; we don't want the
 		 * translation of taskfile registers into
 		 * a sense descriptors, since that's only
 		 * correct for ATA, not ATAPI
 		 */
 		ata_gen_ata_desc_sense(qc);
-
-	else {
+	} else {
 		u8 *scsicmd = cmd->cmnd;
 
 		if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
···
 		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
 		qc->tf.feature |= ATAPI_PKT_DMA;
 
-#ifdef ATAPI_ENABLE_DMADIR
-		/* some SATA bridges need us to indicate data xfer direction */
-		if (cmd->sc_data_direction != DMA_TO_DEVICE)
+		if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
+			/* some SATA bridges need us to indicate data xfer direction */
 			qc->tf.feature |= ATAPI_DMADIR;
-#endif
 	}
 
 	qc->nbytes = cmd->request_bufflen;
 
 	return 0;
+}
+
+static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
+{
+	if (likely(id < ATA_MAX_DEVICES))
+		return &ap->device[id];
+	return NULL;
+}
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+					const struct scsi_device *scsidev)
+{
+	/* skip commands not addressed to targets we simulate */
+	if (unlikely(scsidev->channel || scsidev->lun))
+		return NULL;
+
+	return ata_find_dev(ap, scsidev->id);
+}
+
+/**
+ *	ata_scsi_dev_enabled - determine if device is enabled
+ *	@dev: ATA device
+ *
+ *	Determine if commands should be sent to the specified device.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	0 if commands are not allowed / 1 if commands are allowed
+ */
+
+static int ata_scsi_dev_enabled(struct ata_device *dev)
+{
+	if (unlikely(!ata_dev_enabled(dev)))
+		return 0;
+
+	if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
+		if (unlikely(dev->class == ATA_DEV_ATAPI)) {
+			ata_dev_printk(dev, KERN_WARNING,
+				       "WARNING: ATAPI is %s, device ignored.\n",
+				       atapi_enabled ? "not supported with this driver" : "disabled");
+			return 0;
+		}
+	}
+
+	return 1;
 }
 
 /**
···
  *	RETURNS:
  *	Associated ATA device, or %NULL if not found.
  */
-
 static struct ata_device *
 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
 {
-	struct ata_device *dev;
+	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
 
-	/* skip commands not addressed to targets we simulate */
-	if (likely(scsidev->id < ATA_MAX_DEVICES))
-		dev = &ap->device[scsidev->id];
-	else
+	if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
 		return NULL;
-
-	if (unlikely((scsidev->channel != 0) ||
-		     (scsidev->lun != 0)))
-		return NULL;
-
-	if (unlikely(!ata_dev_present(dev)))
-		return NULL;
-
-	if (!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) {
-		if (unlikely(dev->class == ATA_DEV_ATAPI)) {
-			printk(KERN_WARNING "ata%u(%u): WARNING: ATAPI is %s, device ignored.\n",
-			       ap->id, dev->devno, atapi_enabled ? "not supported with this driver" : "disabled");
-			return NULL;
-		}
-	}
 
 	return dev;
 }
···
 {
 	struct ata_taskfile *tf = &(qc->tf);
 	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
 
 	if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
+		goto invalid_fld;
+
+	/* We may not issue DMA commands if no DMA mode is set */
+	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
 		goto invalid_fld;
 
 	if (scsicmd[1] & 0xe0)
···
 	 */
 	qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
 
+	/* request result TF */
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+
 	return 0;
 
  invalid_fld:
···
 #endif
 }
 
-static inline void __ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
-				       struct ata_port *ap, struct ata_device *dev)
+static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
+				      void (*done)(struct scsi_cmnd *),
+				      struct ata_device *dev)
 {
+	int rc = 0;
+
 	if (dev->class == ATA_DEV_ATA) {
 		ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
 							      cmd->cmnd[0]);
 
 		if (xlat_func)
-			ata_scsi_translate(ap, dev, cmd, done, xlat_func);
+			rc = ata_scsi_translate(dev, cmd, done, xlat_func);
 		else
-			ata_scsi_simulate(ap, dev, cmd, done);
+			ata_scsi_simulate(dev, cmd, done);
 	} else
-		ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
+		rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
+
+	return rc;
 }
 
 /**
···
  *	Releases scsi-layer-held lock, and obtains host_set lock.
  *
  *	RETURNS:
- *	Zero.
+ *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ *	0 otherwise.
  */
-
 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 {
 	struct ata_port *ap;
 	struct ata_device *dev;
 	struct scsi_device *scsidev = cmd->device;
 	struct Scsi_Host *shost = scsidev->host;
+	int rc = 0;
 
-	ap = (struct ata_port *) &shost->hostdata[0];
+	ap = ata_shost_to_port(shost);
 
 	spin_unlock(shost->host_lock);
-	spin_lock(&ap->host_set->lock);
+	spin_lock(ap->lock);
 
 	ata_scsi_dump_cdb(ap, cmd);
 
 	dev = ata_scsi_find_dev(ap, scsidev);
 	if (likely(dev))
-		__ata_scsi_queuecmd(cmd, done, ap, dev);
+		rc = __ata_scsi_queuecmd(cmd, done, dev);
 	else {
 		cmd->result = (DID_BAD_TARGET << 16);
 		done(cmd);
 	}
 
-	spin_unlock(&ap->host_set->lock);
+	spin_unlock(ap->lock);
 	spin_lock(shost->host_lock);
-	return 0;
+	return rc;
 }
 
 /**
  *	ata_scsi_simulate - simulate SCSI command on ATA device
- *	@ap: port the device is connected to
  *	@dev: the target device
  *	@cmd: SCSI command being sent to device.
  *	@done: SCSI command completion function.
···
  *	spin_lock_irqsave(host_set lock)
  */
 
-void ata_scsi_simulate(struct ata_port *ap, struct ata_device *dev,
-		      struct scsi_cmnd *cmd,
+void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 		      void (*done)(struct scsi_cmnd *))
 {
 	struct ata_scsi_args args;
 	const u8 *scsicmd = cmd->cmnd;
 
-	args.ap = ap;
 	args.dev = dev;
 	args.id = dev->id;
 	args.cmd = cmd;
···
 
 void ata_scsi_scan_host(struct ata_port *ap)
 {
-	struct ata_device *dev;
 	unsigned int i;
 
-	if (ap->flags & ATA_FLAG_PORT_DISABLED)
+	if (ap->flags & ATA_FLAG_DISABLED)
 		return;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		struct scsi_device *sdev;
+
+		if (!ata_dev_enabled(dev) || dev->sdev)
+			continue;
+
+		sdev = __scsi_add_device(ap->host, 0, i, 0, NULL);
+		if (!IS_ERR(sdev)) {
+			dev->sdev = sdev;
+			scsi_device_put(sdev);
+		}
+	}
+}
+
+/**
+ *	ata_scsi_offline_dev - offline attached SCSI device
+ *	@dev: ATA device to offline attached SCSI device for
+ *
+ *	This function is called from ata_eh_hotplug() and responsible
+ *	for taking the SCSI device attached to @dev offline.  This
+ *	function is called with host_set lock which protects dev->sdev
+ *	against clearing.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	1 if attached SCSI device exists, 0 otherwise.
+ */
+int ata_scsi_offline_dev(struct ata_device *dev)
+{
+	if (dev->sdev) {
+		scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
+		return 1;
+	}
+	return 0;
+}
+
+/**
+ *	ata_scsi_remove_dev - remove attached SCSI device
+ *	@dev: ATA device to remove attached SCSI device for
+ *
+ *	This function is called from ata_eh_scsi_hotplug() and
+ *	responsible for removing the SCSI device attached to @dev.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_scsi_remove_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	struct scsi_device *sdev;
+	unsigned long flags;
+
+	/* Alas, we need to grab scan_mutex to ensure SCSI device
+	 * state doesn't change underneath us and thus
+	 * scsi_device_get() always succeeds.  The mutex locking can
+	 * be removed if there is __scsi_device_get() interface which
+	 * increments reference counts regardless of device state.
+	 */
+	mutex_lock(&ap->host->scan_mutex);
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* clearing dev->sdev is protected by host_set lock */
+	sdev = dev->sdev;
+	dev->sdev = NULL;
+
+	if (sdev) {
+		/* If user initiated unplug races with us, sdev can go
+		 * away underneath us after the host_set lock and
+		 * scan_mutex are released.  Hold onto it.
+		 */
+		if (scsi_device_get(sdev) == 0) {
+			/* The following ensures the attached sdev is
+			 * offline on return from ata_scsi_offline_dev()
+			 * regardless it wins or loses the race
+			 * against this function.
+			 */
+			scsi_device_set_state(sdev, SDEV_OFFLINE);
+		} else {
+			WARN_ON(1);
+			sdev = NULL;
+		}
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+	mutex_unlock(&ap->host->scan_mutex);
+
+	if (sdev) {
+		ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
+			       sdev->sdev_gendev.bus_id);
+
+		scsi_remove_device(sdev);
+		scsi_device_put(sdev);
+	}
+}
+
+/**
+ *	ata_scsi_hotplug - SCSI part of hotplug
+ *	@data: Pointer to ATA port to perform SCSI hotplug on
+ *
+ *	Perform SCSI part of hotplug.  It's executed from a separate
+ *	workqueue after EH completes.  This is necessary because SCSI
+ *	hot plugging requires working EH and hot unplugging is
+ *	synchronized with hot plugging with a mutex.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_hotplug(void *data)
+{
+	struct ata_port *ap = data;
+	int i;
+
+	if (ap->flags & ATA_FLAG_UNLOADING) {
+		DPRINTK("ENTER/EXIT - unloading\n");
+		return;
+	}
+
+	DPRINTK("ENTER\n");
+
+	/* unplug detached devices */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		unsigned long flags;
+
+		if (!(dev->flags & ATA_DFLAG_DETACHED))
+			continue;
+
+		spin_lock_irqsave(ap->lock, flags);
+		dev->flags &= ~ATA_DFLAG_DETACHED;
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		ata_scsi_remove_dev(dev);
+	}
+
+	/* scan for new ones */
+	ata_scsi_scan_host(ap);
+
+	/* If we scanned while EH was in progress, scan would have
+	 * failed silently.  Requeue if there are enabled but
+	 * unattached devices.
+	 */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		if (ata_dev_enabled(dev) && !dev->sdev) {
+			queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
+			break;
+		}
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_scsi_user_scan - indication for user-initiated bus scan
+ *	@shost: SCSI host to scan
+ *	@channel: Channel to scan
+ *	@id: ID to scan
+ *	@lun: LUN to scan
+ *
+ *	This function is called when user explicitly requests bus
+ *	scan.  Set probe pending flag and invoke EH.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+			      unsigned int id, unsigned int lun)
+{
+	struct ata_port *ap = ata_shost_to_port(shost);
+	unsigned long flags;
+	int rc = 0;
+
+	if (!ap->ops->error_handler)
+		return -EOPNOTSUPP;
+
+	if ((channel != SCAN_WILD_CARD && channel != 0) ||
+	    (lun != SCAN_WILD_CARD && lun != 0))
+		return -EINVAL;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	if (id == SCAN_WILD_CARD) {
+		ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+		ap->eh_info.action |= ATA_EH_SOFTRESET;
+	} else {
+		struct ata_device *dev = ata_find_dev(ap, id);
+
+		if (dev) {
+			ap->eh_info.probe_mask |= 1 << dev->devno;
+			ap->eh_info.action |= ATA_EH_SOFTRESET;
+		} else
+			rc = -EINVAL;
+	}
+
+	if (rc == 0)
+		ata_port_schedule_eh(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_dev_rescan - initiate scsi_rescan_device()
+ *	@data: Pointer to ATA port to perform scsi_rescan_device()
+ *
+ *	After ATA pass thru (SAT) commands are executed successfully,
+ *	libata need to propagate the changes to SCSI layer.  This
+ *	function must be executed from ata_aux_wq such that sdev
+ *	attach/detach don't race with rescan.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_dev_rescan(void *data)
+{
+	struct ata_port *ap = data;
+	struct ata_device *dev;
+	unsigned int i;
 
 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
 		dev = &ap->device[i];
 
-		if (ata_dev_present(dev))
-			scsi_scan_target(&ap->host->shost_gendev, 0, i, 0, 0);
+		if (ata_dev_enabled(dev) && dev->sdev)
+			scsi_rescan_device(&(dev->sdev->sdev_gendev));
 	}
 }
-

drivers/scsi/libata.h

···
 #define __LIBATA_H__
 
 #define DRV_NAME	"libata"
-#define DRV_VERSION	"1.20"	/* must be exactly four chars */
+#define DRV_VERSION	"1.30"	/* must be exactly four chars */
 
 struct ata_scsi_args {
-	struct ata_port		*ap;
 	struct ata_device	*dev;
 	u16			*id;
 	struct scsi_cmnd	*cmd;
···
 };
 
 /* libata-core.c */
+extern struct workqueue_struct *ata_aux_wq;
 extern int atapi_enabled;
+extern int atapi_dmadir;
 extern int libata_fua;
-extern struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
-				      struct ata_device *dev);
+extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
 extern int ata_rwcmd_protocol(struct ata_queued_cmd *qc);
+extern void ata_dev_disable(struct ata_device *dev);
 extern void ata_port_flush_task(struct ata_port *ap);
+extern unsigned ata_exec_internal(struct ata_device *dev,
+				  struct ata_taskfile *tf, const u8 *cdb,
+				  int dma_dir, void *buf, unsigned int buflen);
+extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+			   int post_reset, u16 *id);
+extern int ata_dev_configure(struct ata_device *dev, int print_info);
+extern int sata_down_spd_limit(struct ata_port *ap);
+extern int sata_set_spd_needed(struct ata_port *ap);
+extern int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0);
+extern int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
 extern void ata_qc_free(struct ata_queued_cmd *qc);
 extern void ata_qc_issue(struct ata_queued_cmd *qc);
+extern void __ata_qc_complete(struct ata_queued_cmd *qc);
 extern int ata_check_atapi_dma(struct ata_queued_cmd *qc);
 extern void ata_dev_select(struct ata_port *ap, unsigned int device,
                            unsigned int wait, unsigned int can_sleep);
 extern void swap_buf_le16(u16 *buf, unsigned int buf_words);
+extern void ata_dev_init(struct ata_device *dev);
 extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg);
 extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
 
···
 extern struct scsi_transport_template ata_scsi_transport_template;
 
 extern void ata_scsi_scan_host(struct ata_port *ap);
+extern int ata_scsi_offline_dev(struct ata_device *dev);
+extern void ata_scsi_hotplug(void *data);
 extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
 			       unsigned int buflen);
 
···
 extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
                         unsigned int (*actor) (struct ata_scsi_args *args,
                                            u8 *rbuf, unsigned int buflen));
+extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
+extern void ata_scsi_dev_rescan(void *data);
+
+/* libata-eh.c */
+extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
+extern void ata_scsi_error(struct Scsi_Host *host);
+extern void ata_port_wait_eh(struct ata_port *ap);
+extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc);
 
 #endif /* __LIBATA_H__ */

drivers/scsi/pdc_adma.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"pdc_adma"
-#define DRV_VERSION	"0.03"
+#define DRV_VERSION	"0.04"
 
 /* macro to calculate base address for ATA regs */
 #define ADMA_ATA_REGS(base,port_no)	((base) + ((port_no) * 0x40))
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ADMA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.qc_prep		= adma_qc_prep,
 	.qc_issue		= adma_qc_issue,
 	.eng_timeout		= adma_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
 	.irq_handler		= adma_intr,
 	.irq_clear		= adma_irq_clear,
 	.port_start		= adma_port_start,
···
 			continue;
 		handled = 1;
 		adma_enter_reg_mode(ap);
-		if (ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))
+		if (ap->flags & ATA_FLAG_DISABLED)
 			continue;
 		pp = ap->private_data;
 		if (!pp || pp->state != adma_state_pkt)
 			continue;
 		qc = ata_qc_from_tag(ap, ap->active_tag);
-		if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+		if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 			if ((status & (aPERR | aPSD | aUIRQ)))
 				qc->err_mask |= AC_ERR_OTHER;
 			else if (pp->pkt[0] != cDONE)
···
 	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
 		struct ata_port *ap;
 		ap = host_set->ports[port_no];
-		if (ap && (!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR)))) {
+		if (ap && (!(ap->flags & ATA_FLAG_DISABLED))) {
 			struct ata_queued_cmd *qc;
 			struct adma_port_priv *pp = ap->private_data;
 			if (!pp || pp->state != adma_state_mmio)
 				continue;
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 
 				/* check main status, clearing INTRQ */
 				u8 status = ata_check_status(ap);

drivers/scsi/sata_mv.c

···
 	MV_FLAG_IRQ_COALESCE	= (1 << 29),  /* IRQ coalescing capability */
 	MV_COMMON_FLAGS		= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
 				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
-				   ATA_FLAG_NO_ATAPI),
+				   ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING),
 	MV_6XXX_FLAGS		= MV_FLAG_IRQ_COALESCE,
 
 	CRQB_FLAG_READ		= (1 << 0),
···
 
 /* Command ReQuest Block: 32B */
 struct mv_crqb {
-	u32			sg_addr;
-	u32			sg_addr_hi;
-	u16			ctrl_flags;
-	u16			ata_cmd[11];
+	__le32			sg_addr;
+	__le32			sg_addr_hi;
+	__le16			ctrl_flags;
+	__le16			ata_cmd[11];
 };
 
 struct mv_crqb_iie {
-	u32			addr;
-	u32			addr_hi;
-	u32			flags;
-	u32			len;
-	u32			ata_cmd[4];
+	__le32			addr;
+	__le32			addr_hi;
+	__le32			flags;
+	__le32			len;
+	__le32			ata_cmd[4];
 };
 
 /* Command ResPonse Block: 8B */
 struct mv_crpb {
-	u16			id;
-	u16			flags;
-	u32			tmstmp;
+	__le16			id;
+	__le16			flags;
+	__le32			tmstmp;
 };
 
 /* EDMA Physical Region Descriptor (ePRD); A.K.A. SG */
 struct mv_sg {
-	u32			addr;
-	u32			flags_size;
-	u32			addr_hi;
-	u32			reserved;
+	__le32			addr;
+	__le32			flags_size;
+	__le32			addr_hi;
+	__le32			reserved;
 };
 
 struct mv_port_priv {
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= MV_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 
 	.qc_prep		= mv_qc_prep,
 	.qc_issue		= mv_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
 
 	.eng_timeout		= mv_eng_timeout,
 
···
 
 	.qc_prep		= mv_qc_prep,
 	.qc_issue		= mv_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
 
 	.eng_timeout		= mv_eng_timeout,
 
···
 	}
 
 	if (EDMA_EN & reg) {
-		printk(KERN_ERR "ata%u: Unable to stop eDMA\n", ap->id);
+		ata_port_printk(ap, KERN_ERR, "Unable to stop eDMA\n");
 		/* FIXME: Consider doing a reset here to recover */
 	}
 }
···
 	return (index + 1) & MV_MAX_Q_DEPTH_MASK;
 }
 
-static inline void mv_crqb_pack_cmd(u16 *cmdw, u8 data, u8 addr, unsigned last)
+static inline void mv_crqb_pack_cmd(__le16 *cmdw, u8 data, u8 addr, unsigned last)
 {
 	u16 tmp = data | (addr << CRQB_CMD_ADDR_SHIFT) | CRQB_CMD_CS |
 		(last ? CRQB_CMD_LAST : 0);
···
 {
 	struct ata_port *ap = qc->ap;
 	struct mv_port_priv *pp = ap->private_data;
-	u16 *cw;
+	__le16 *cw;
 	struct ata_taskfile *tf;
 	u16 flags = 0;
 	unsigned in_index;
···
 	edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
 
 	if (EDMA_ERR_SERR & edma_err_cause) {
-		serr = scr_read(ap, SCR_ERROR);
-		scr_write_flush(ap, SCR_ERROR, serr);
+		sata_scr_read(ap, SCR_ERROR, &serr);
+		sata_scr_write_flush(ap, SCR_ERROR, serr);
 	}
 	if (EDMA_ERR_SELF_DIS & edma_err_cause) {
 		struct mv_port_priv *pp	= ap->private_data;
···
 		/* Note that DEV_IRQ might happen spuriously during EDMA,
 		 * and should be ignored in such cases.
 		 * The cause of this is still under investigation.
-		 */ 
+		 */
 		if (pp->pp_flags & MV_PP_FLAG_EDMA_EN) {
 			/* EDMA: check for response queue interrupt */
 			if ((CRPB_DMA_DONE << hard_port) & hc_irq_cause) {
···
 			}
 		}
 
-		if (ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))
+		if (ap && (ap->flags & ATA_FLAG_DISABLED))
 			continue;
 
 		err_mask = ac_err_mask(ata_status);
···
 				VPRINTK("port %u IRQ found for qc, "
 					"ata_status 0x%x\n", port,ata_status);
 				/* mark qc status appropriately */
-				if (!(qc->tf.ctl & ATA_NIEN)) {
+				if (!(qc->tf.flags & ATA_TFLAG_POLLING)) {
 					qc->err_mask |= err_mask;
 					ata_qc_complete(qc);
 				}
···
 
 	/* Issue COMRESET via SControl */
 comreset_retry:
-	scr_write_flush(ap, SCR_CONTROL, 0x301);
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
 	__msleep(1, can_sleep);
 
-	scr_write_flush(ap, SCR_CONTROL, 0x300);
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
 	__msleep(20, can_sleep);
 
 	timeout = jiffies + msecs_to_jiffies(200);
 	do {
-		sstatus = scr_read(ap, SCR_STATUS) & 0x3;
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
+		sstatus &= 0x3;
 		if ((sstatus == 3) || (sstatus == 0))
 			break;
 
···
 		"SCtrl 0x%08x\n", mv_scr_read(ap, SCR_STATUS),
 		mv_scr_read(ap, SCR_ERROR), mv_scr_read(ap, SCR_CONTROL));
 
-	if (sata_dev_present(ap)) {
+	if (ata_port_online(ap)) {
 		ata_port_probe(ap);
 	} else {
-		printk(KERN_INFO "ata%u: no device found (phy stat %08x)\n",
-		       ap->id, scr_read(ap, SCR_STATUS));
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
+		ata_port_printk(ap, KERN_INFO,
+				"no device found (phy stat %08x)\n", sstatus);
 		ata_port_disable(ap);
 		return;
 	}
···
 	tf.nsect = readb((void __iomem *) ap->ioaddr.nsect_addr);
 
 	dev->class = ata_dev_classify(&tf);
-	if (!ata_dev_present(dev)) {
+	if (!ata_dev_enabled(dev)) {
 		VPRINTK("Port disabled post-sig: No device present.\n");
 		ata_port_disable(ap);
 	}
···
 	struct ata_queued_cmd *qc;
 	unsigned long flags;
 
-	printk(KERN_ERR "ata%u: Entering mv_eng_timeout\n",ap->id);
+	ata_port_printk(ap, KERN_ERR, "Entering mv_eng_timeout\n");
 	DPRINTK("All regs @ start of eng_timeout\n");
 	mv_dump_all_regs(ap->host_set->mmio_base, ap->port_no,
 			 to_pci_dev(ap->host_set->dev));

drivers/scsi/sata_nv.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME			"sata_nv"
-#define DRV_VERSION			"0.8"
+#define DRV_VERSION			"0.9"
 
 enum {
 	NV_PORTS			= 2,
···
 	NV_PORT0_SCR_REG_OFFSET		= 0x00,
 	NV_PORT1_SCR_REG_OFFSET		= 0x40,
 
+	/* INT_STATUS/ENABLE */
 	NV_INT_STATUS			= 0x10,
-	NV_INT_STATUS_CK804		= 0x440,
-	NV_INT_STATUS_PDEV_INT		= 0x01,
-	NV_INT_STATUS_PDEV_PM		= 0x02,
-	NV_INT_STATUS_PDEV_ADDED	= 0x04,
-	NV_INT_STATUS_PDEV_REMOVED	= 0x08,
-	NV_INT_STATUS_SDEV_INT		= 0x10,
-	NV_INT_STATUS_SDEV_PM		= 0x20,
-	NV_INT_STATUS_SDEV_ADDED	= 0x40,
-	NV_INT_STATUS_SDEV_REMOVED	= 0x80,
-	NV_INT_STATUS_PDEV_HOTPLUG	= (NV_INT_STATUS_PDEV_ADDED |
-					   NV_INT_STATUS_PDEV_REMOVED),
-	NV_INT_STATUS_SDEV_HOTPLUG	= (NV_INT_STATUS_SDEV_ADDED |
-					   NV_INT_STATUS_SDEV_REMOVED),
-	NV_INT_STATUS_HOTPLUG		= (NV_INT_STATUS_PDEV_HOTPLUG |
-					   NV_INT_STATUS_SDEV_HOTPLUG),
-
 	NV_INT_ENABLE			= 0x11,
+	NV_INT_STATUS_CK804		= 0x440,
 	NV_INT_ENABLE_CK804		= 0x441,
-	NV_INT_ENABLE_PDEV_MASK		= 0x01,
-	NV_INT_ENABLE_PDEV_PM		= 0x02,
-	NV_INT_ENABLE_PDEV_ADDED	= 0x04,
-	NV_INT_ENABLE_PDEV_REMOVED	= 0x08,
-	NV_INT_ENABLE_SDEV_MASK		= 0x10,
-	NV_INT_ENABLE_SDEV_PM		= 0x20,
-	NV_INT_ENABLE_SDEV_ADDED	= 0x40,
-	NV_INT_ENABLE_SDEV_REMOVED	= 0x80,
-	NV_INT_ENABLE_PDEV_HOTPLUG	= (NV_INT_ENABLE_PDEV_ADDED |
-					   NV_INT_ENABLE_PDEV_REMOVED),
-	NV_INT_ENABLE_SDEV_HOTPLUG	= (NV_INT_ENABLE_SDEV_ADDED |
-					   NV_INT_ENABLE_SDEV_REMOVED),
-	NV_INT_ENABLE_HOTPLUG		= (NV_INT_ENABLE_PDEV_HOTPLUG |
-					   NV_INT_ENABLE_SDEV_HOTPLUG),
 
+	/* INT_STATUS/ENABLE bits */
+	NV_INT_DEV			= 0x01,
+	NV_INT_PM			= 0x02,
+	NV_INT_ADDED			= 0x04,
+	NV_INT_REMOVED			= 0x08,
+
+	NV_INT_PORT_SHIFT		= 4,	/* each port occupies 4 bits */
+
+	NV_INT_ALL			= 0x0f,
+	NV_INT_MASK			= NV_INT_DEV |
+					  NV_INT_ADDED | NV_INT_REMOVED,
+
+	/* INT_CONFIG */
 	NV_INT_CONFIG			= 0x12,
 	NV_INT_CONFIG_METHD		= 0x01, // 0 = INT, 1 = SMI
 
···
 };
 
 static int nv_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
-static irqreturn_t nv_interrupt (int irq, void *dev_instance,
-				 struct pt_regs *regs);
+static void nv_ck804_host_stop(struct ata_host_set *host_set);
+static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance,
+					struct pt_regs *regs);
+static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance,
+				    struct pt_regs *regs);
+static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance,
+				      struct pt_regs *regs);
 static u32 nv_scr_read (struct ata_port *ap, unsigned int sc_reg);
 static void nv_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
-static void nv_host_stop (struct ata_host_set *host_set);
-static void nv_enable_hotplug(struct ata_probe_ent *probe_ent);
-static void nv_disable_hotplug(struct ata_host_set *host_set);
-static int nv_check_hotplug(struct ata_host_set *host_set);
-static void nv_enable_hotplug_ck804(struct ata_probe_ent *probe_ent);
-static void nv_disable_hotplug_ck804(struct ata_host_set *host_set);
-static int nv_check_hotplug_ck804(struct ata_host_set *host_set);
+
+static void nv_nf2_freeze(struct ata_port *ap);
+static void nv_nf2_thaw(struct ata_port *ap);
+static void nv_ck804_freeze(struct ata_port *ap);
+static void nv_ck804_thaw(struct ata_port *ap);
+static void nv_error_handler(struct ata_port *ap);
 
 enum nv_host_type
 {
 	GENERIC,
 	NFORCE2,
-	NFORCE3,
+	NFORCE3 = NFORCE2,	/* NF2 == NF3 as far as sata_nv is concerned */
 	CK804
 };
 
···
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
 	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SATA2,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045f, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
 	{ PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 		PCI_ANY_ID, PCI_ANY_ID,
 		PCI_CLASS_STORAGE_IDE<<8, 0xffff00, GENERIC },
···
 		PCI_ANY_ID, PCI_ANY_ID,
 		PCI_CLASS_STORAGE_RAID<<8, 0xffff00, GENERIC },
 	{ 0, } /* terminate list */
-};
-
-struct nv_host_desc
-{
-	enum nv_host_type	host_type;
-	void			(*enable_hotplug)(struct ata_probe_ent *probe_ent);
-	void			(*disable_hotplug)(struct ata_host_set *host_set);
-	int			(*check_hotplug)(struct ata_host_set *host_set);
-
-};
-static struct nv_host_desc nv_device_tbl[] = {
-	{
-		.host_type	= GENERIC,
-		.enable_hotplug	= NULL,
-		.disable_hotplug= NULL,
-		.check_hotplug	= NULL,
-	},
-	{
-		.host_type	= NFORCE2,
-		.enable_hotplug	= nv_enable_hotplug,
-		.disable_hotplug= nv_disable_hotplug,
-		.check_hotplug	= nv_check_hotplug,
-	},
-	{
-		.host_type	= NFORCE3,
-		.enable_hotplug	= nv_enable_hotplug,
-		.disable_hotplug= nv_disable_hotplug,
-		.check_hotplug	= nv_check_hotplug,
-	},
-	{	.host_type	= CK804,
-		.enable_hotplug	= nv_enable_hotplug_ck804,
-		.disable_hotplug= nv_disable_hotplug_ck804,
-		.check_hotplug	= nv_check_hotplug_ck804,
-	},
-};
-
-struct nv_host
-{
-	struct nv_host_desc	*host_desc;
-	unsigned long		host_flags;
 };
 
 static struct pci_driver nv_pci_driver = {
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
-static const struct ata_port_operations nv_ops = {
+static const struct ata_port_operations nv_generic_ops = {
 	.port_disable		= ata_port_disable,
 	.tf_load		= ata_tf_load,
 	.tf_read		= ata_tf_read,
 	.exec_command		= ata_exec_command,
 	.check_status		= ata_check_status,
 	.dev_select		= ata_std_dev_select,
-	.phy_reset		= sata_phy_reset,
 	.bmdma_setup		= ata_bmdma_setup,
 	.bmdma_start		= ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
-	.eng_timeout		= ata_eng_timeout,
-	.irq_handler		= nv_interrupt,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_generic_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
 	.scr_read		= nv_scr_read,
 	.scr_write		= nv_scr_write,
 	.port_start		= ata_port_start,
 	.port_stop		= ata_port_stop,
-	.host_stop		= nv_host_stop,
+	.host_stop		= ata_pci_host_stop,
 };
 
-/* FIXME: The hardware provides the necessary SATA PHY controls
- * to support ATA_FLAG_SATA_RESET.  However, it is currently
- * necessary to disable that flag, to solve misdetection problems.
- * See http://bugme.osdl.org/show_bug.cgi?id=3352 for more info.
- *
- * This problem really needs to be investigated further.  But in the
- * meantime, we avoid ATA_FLAG_SATA_RESET to get people working.
- */
-static struct ata_port_info nv_port_info = {
-	.sht		= &nv_sht,
-	.host_flags	= ATA_FLAG_SATA |
-			  /* ATA_FLAG_SATA_RESET | */
-			  ATA_FLAG_SRST |
-			  ATA_FLAG_NO_LEGACY,
-	.pio_mask	= NV_PIO_MASK,
-	.mwdma_mask	= NV_MWDMA_MASK,
-	.udma_mask	= NV_UDMA_MASK,
-	.port_ops	= &nv_ops,
+static const struct ata_port_operations nv_nf2_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.freeze			= nv_nf2_freeze,
+	.thaw			= nv_nf2_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_nf2_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= nv_scr_read,
+	.scr_write		= nv_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static const struct ata_port_operations nv_ck804_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.freeze			= nv_ck804_freeze,
+	.thaw			= nv_ck804_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_ck804_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= nv_scr_read,
+	.scr_write		= nv_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= nv_ck804_host_stop,
+};
+
+static struct ata_port_info nv_port_info[] = {
+	/* generic */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_generic_ops,
+	},
+	/* nforce2/3 */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_nf2_ops,
+	},
+	/* ck804 */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_ck804_ops,
+	},
 };
 
 MODULE_AUTHOR("NVIDIA");
···
 MODULE_DEVICE_TABLE(pci, nv_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
 
-static irqreturn_t nv_interrupt (int irq, void *dev_instance,
-				 struct pt_regs *regs)
+static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance,
+					struct pt_regs *regs)
 {
 	struct ata_host_set *host_set = dev_instance;
-	struct nv_host *host = host_set->private_data;
 	unsigned int i;
 	unsigned int handled = 0;
 	unsigned long flags;
···
 
 		ap = host_set->ports[i];
 		if (ap &&
-		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
 			struct ata_queued_cmd *qc;
 
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN)))
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 				handled += ata_host_intr(ap, qc);
 			else
 				// No request pending?  Clear interrupt status
···
 
 	}
 
-	if (host->host_desc->check_hotplug)
-		handled += host->host_desc->check_hotplug(host_set);
-
 	spin_unlock_irqrestore(&host_set->lock, flags);
 
 	return IRQ_RETVAL(handled);
+}
+
+static int nv_host_intr(struct ata_port *ap, u8 irq_stat)
+{
+	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+	int handled;
+
+	/* freeze if hotplugged */
+	if (unlikely(irq_stat & (NV_INT_ADDED | NV_INT_REMOVED))) {
+		ata_port_freeze(ap);
+		return 1;
+	}
+
+	/* bail out if not our interrupt */
+	if (!(irq_stat & NV_INT_DEV))
+		return 0;
+
+	/* DEV interrupt w/ no active qc? */
+	if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
+		ata_check_status(ap);
+		return 1;
+	}
+
+	/* handle interrupt */
+	handled = ata_host_intr(ap, qc);
+	if (unlikely(!handled)) {
+		/* spurious, clear it */
+		ata_check_status(ap);
+	}
+
+	return 1;
+}
+
+static irqreturn_t nv_do_interrupt(struct ata_host_set *host_set, u8 irq_stat)
+{
+	int i, handled = 0;
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		if (ap && !(ap->flags & ATA_FLAG_DISABLED))
+			handled += nv_host_intr(ap, irq_stat);
+
+		irq_stat >>= NV_INT_PORT_SHIFT;
+	}
+
+	return IRQ_RETVAL(handled);
+}
+
+static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance,
+				    struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	u8 irq_stat;
+	irqreturn_t ret;
+
+	spin_lock(&host_set->lock);
+	irq_stat = inb(host_set->ports[0]->ioaddr.scr_addr + NV_INT_STATUS);
+	ret = nv_do_interrupt(host_set, irq_stat);
+	spin_unlock(&host_set->lock);
+
+	return ret;
+}
+
+static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance,
+				      struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	u8 irq_stat;
+	irqreturn_t ret;
+
+	spin_lock(&host_set->lock);
+	irq_stat = readb(host_set->mmio_base + NV_INT_STATUS_CK804);
+	ret = nv_do_interrupt(host_set, irq_stat);
+	spin_unlock(&host_set->lock);
+
+	return ret;
 }
 
 static u32 nv_scr_read (struct ata_port *ap, unsigned int sc_reg)
···
 	iowrite32(val, (void __iomem *)ap->ioaddr.scr_addr + (sc_reg * 4));
 }
 
-static void nv_host_stop (struct ata_host_set *host_set)
+static void nv_nf2_freeze(struct ata_port *ap)
 {
-	struct nv_host *host = host_set->private_data;
+	unsigned long scr_addr = ap->host_set->ports[0]->ioaddr.scr_addr;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
 
-	// Disable hotplug event interrupts.
-	if (host->host_desc->disable_hotplug)
-		host->host_desc->disable_hotplug(host_set);
+	mask = inb(scr_addr + NV_INT_ENABLE);
+	mask &= ~(NV_INT_ALL << shift);
+	outb(mask, scr_addr + NV_INT_ENABLE);
+}
 
-	kfree(host);
+static void nv_nf2_thaw(struct ata_port *ap)
+{
+	unsigned long scr_addr = ap->host_set->ports[0]->ioaddr.scr_addr;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
 
-	ata_pci_host_stop(host_set);
+	outb(NV_INT_ALL << shift, scr_addr + NV_INT_STATUS);
+
+	mask = inb(scr_addr + NV_INT_ENABLE);
+	mask |= (NV_INT_MASK << shift);
+	outb(mask, scr_addr + NV_INT_ENABLE);
+}
+
+static void nv_ck804_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	mask = readb(mmio_base + NV_INT_ENABLE_CK804);
+	mask &= ~(NV_INT_ALL << shift);
+	writeb(mask, mmio_base + NV_INT_ENABLE_CK804);
+}
+
+static void nv_ck804_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	writeb(NV_INT_ALL << shift, mmio_base + NV_INT_STATUS_CK804);
+
+	mask = readb(mmio_base + NV_INT_ENABLE_CK804);
+	mask |= (NV_INT_MASK << shift);
+	writeb(mask, mmio_base + NV_INT_ENABLE_CK804);
+}
+
+static int nv_hardreset(struct ata_port *ap, unsigned int *class)
+{
+	unsigned int dummy;
+
+	/* SATA hardreset fails to retrieve proper device signature on
+	 * some controllers.  Don't classify on hardreset.  For more
+	 * info, see http://bugme.osdl.org/show_bug.cgi?id=3352
+	 */
+	return sata_std_hardreset(ap, &dummy);
+}
+
+static void nv_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset,
+			   nv_hardreset, ata_std_postreset);
 }
 
 static int nv_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version = 0;
-	struct nv_host *host;
 	struct ata_port_info *ppi;
 	struct ata_probe_ent *probe_ent;
 	int pci_dev_busy = 0;
···
 
 	rc = -ENOMEM;
 
-	ppi = &nv_port_info;
+	ppi = &nv_port_info[ent->driver_data];
 	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
 	if (!probe_ent)
 		goto err_out_regions;
 
-	host = kmalloc(sizeof(struct nv_host), GFP_KERNEL);
-	if (!host)
-		goto err_out_free_ent;
-
-	memset(host, 0, sizeof(struct nv_host));
-	host->host_desc = &nv_device_tbl[ent->driver_data];
-
-	probe_ent->private_data = host;
-
 	probe_ent->mmio_base = pci_iomap(pdev, 5, 0);
 	if (!probe_ent->mmio_base) {
 		rc = -EIO;
-		goto err_out_free_host;
+		goto err_out_free_ent;
 	}
 
 	base = (unsigned long)probe_ent->mmio_base;
···
 	probe_ent->port[0].scr_addr = base + NV_PORT0_SCR_REG_OFFSET;
 	probe_ent->port[1].scr_addr = base + NV_PORT1_SCR_REG_OFFSET;
 
+	/* enable SATA space for CK804 */
+	if (ent->driver_data == CK804) {
+		u8 regval;
+
+		pci_read_config_byte(pdev, NV_MCP_SATA_CFG_20, &regval);
+		regval |= NV_MCP_SATA_CFG_20_SATA_SPACE_EN;
+		pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
+	}
+
 	pci_set_master(pdev);
 
 	rc = ata_device_add(probe_ent);
 	if (rc != NV_PORTS)
 		goto err_out_iounmap;
-
-	// Enable hotplug event interrupts.
-	if (host->host_desc->enable_hotplug)
-		host->host_desc->enable_hotplug(probe_ent);
 
 	kfree(probe_ent);
 
···
 
 err_out_iounmap:
 	pci_iounmap(pdev, probe_ent->mmio_base);
-err_out_free_host:
-	kfree(host);
 err_out_free_ent:
 	kfree(probe_ent);
 err_out_regions:
···
 	return rc;
 }
 
-static void nv_enable_hotplug(struct ata_probe_ent *probe_ent)
-{
-	u8 intr_mask;
-
-	outb(NV_INT_STATUS_HOTPLUG,
-		probe_ent->port[0].scr_addr + NV_INT_STATUS);
-
-	intr_mask = inb(probe_ent->port[0].scr_addr + NV_INT_ENABLE);
-	intr_mask |= NV_INT_ENABLE_HOTPLUG;
-
-	outb(intr_mask, probe_ent->port[0].scr_addr + NV_INT_ENABLE);
-}
-
-static void nv_disable_hotplug(struct ata_host_set *host_set)
-{
-	u8 intr_mask;
-
-	intr_mask = inb(host_set->ports[0]->ioaddr.scr_addr + NV_INT_ENABLE);
-
-	intr_mask &= ~(NV_INT_ENABLE_HOTPLUG);
-
-	outb(intr_mask, host_set->ports[0]->ioaddr.scr_addr + NV_INT_ENABLE);
-}
-
-static int nv_check_hotplug(struct ata_host_set *host_set)
-{
-	u8 intr_status;
-
-	intr_status = inb(host_set->ports[0]->ioaddr.scr_addr + NV_INT_STATUS);
-
-	// Clear interrupt status.
-	outb(0xff, host_set->ports[0]->ioaddr.scr_addr + NV_INT_STATUS);
-
-	if (intr_status & NV_INT_STATUS_HOTPLUG) {
-		if (intr_status & NV_INT_STATUS_PDEV_ADDED)
-			printk(KERN_WARNING "nv_sata: "
-				"Primary device added\n");
-
-		if (intr_status & NV_INT_STATUS_PDEV_REMOVED)
-			printk(KERN_WARNING "nv_sata: "
-				"Primary device removed\n");
-
-		if (intr_status & NV_INT_STATUS_SDEV_ADDED)
-			printk(KERN_WARNING "nv_sata: "
-				"Secondary device added\n");
-
-		if (intr_status & NV_INT_STATUS_SDEV_REMOVED)
-			printk(KERN_WARNING "nv_sata: "
-				"Secondary device removed\n");
-
-		return 1;
-	}
-
-	return 0;
-}
-
-static void nv_enable_hotplug_ck804(struct ata_probe_ent *probe_ent)
-{
-	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
-	u8 intr_mask;
-	u8 regval;
-
-	pci_read_config_byte(pdev, NV_MCP_SATA_CFG_20, &regval);
-	regval |= NV_MCP_SATA_CFG_20_SATA_SPACE_EN;
-	pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
-
-	writeb(NV_INT_STATUS_HOTPLUG, probe_ent->mmio_base + NV_INT_STATUS_CK804);
-
-	intr_mask = readb(probe_ent->mmio_base + NV_INT_ENABLE_CK804);
-	intr_mask |= NV_INT_ENABLE_HOTPLUG;
-
-	writeb(intr_mask, probe_ent->mmio_base + NV_INT_ENABLE_CK804);
-}
-
-static void nv_disable_hotplug_ck804(struct ata_host_set *host_set)
+static void nv_ck804_host_stop(struct ata_host_set *host_set)
 {
 	struct pci_dev *pdev = to_pci_dev(host_set->dev);
-	u8 intr_mask;
 	u8 regval;
 
-	intr_mask = readb(host_set->mmio_base + NV_INT_ENABLE_CK804);
-
-	intr_mask &= ~(NV_INT_ENABLE_HOTPLUG);
-
-	writeb(intr_mask, host_set->mmio_base + NV_INT_ENABLE_CK804);
-
+	/* disable SATA space for CK804 */
 	pci_read_config_byte(pdev, NV_MCP_SATA_CFG_20, &regval);
 	regval &= ~NV_MCP_SATA_CFG_20_SATA_SPACE_EN;
 	pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
-}
 
-static int nv_check_hotplug_ck804(struct ata_host_set *host_set)
-{
-	u8 intr_status;
-
-	intr_status = readb(host_set->mmio_base + NV_INT_STATUS_CK804);
-
-	// Clear interrupt status.
-	writeb(0xff, host_set->mmio_base + NV_INT_STATUS_CK804);
-
-	if (intr_status & NV_INT_STATUS_HOTPLUG) {
-		if (intr_status & NV_INT_STATUS_PDEV_ADDED)
-			printk(KERN_WARNING "nv_sata: "
-				"Primary device added\n");
-
-		if (intr_status & NV_INT_STATUS_PDEV_REMOVED)
-			printk(KERN_WARNING "nv_sata: "
-				"Primary device removed\n");
-
-		if (intr_status & NV_INT_STATUS_SDEV_ADDED)
-			printk(KERN_WARNING "nv_sata: "
-				"Secondary device added\n");
-
-		if (intr_status & NV_INT_STATUS_SDEV_REMOVED)
-			printk(KERN_WARNING "nv_sata: "
-				"Secondary device removed\n");
-
-		return 1;
-	}
-
-	return 0;
+	ata_pci_host_stop(host_set);
 }
 
 static int __init nv_init(void)

drivers/scsi/sata_promise.c

···
 	PDC_RESET		= (1 << 11), /* HDMA reset */
 
 	PDC_COMMON_FLAGS	= ATA_FLAG_NO_LEGACY | ATA_FLAG_SRST |
-				  ATA_FLAG_MMIO | ATA_FLAG_NO_ATAPI,
+				  ATA_FLAG_MMIO | ATA_FLAG_NO_ATAPI |
+				  ATA_FLAG_PIO_POLLING,
 };
 
 
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.qc_prep		= pdc_qc_prep,
 	.qc_issue		= pdc_qc_issue_prot,
 	.eng_timeout		= pdc_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
 	.irq_handler		= pdc_interrupt,
 	.irq_clear		= pdc_irq_clear,
 
···
 
 	.qc_prep		= pdc_qc_prep,
 	.qc_issue		= pdc_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
 	.eng_timeout		= pdc_eng_timeout,
 	.irq_handler		= pdc_interrupt,
 	.irq_clear		= pdc_irq_clear,
···
 	sata_phy_reset(ap);
 }
 
+static void pdc_pata_cbl_detect(struct ata_port *ap)
+{
+	u8 tmp;
+	void __iomem *mmio = (void *) ap->ioaddr.cmd_addr + PDC_CTLSTAT + 0x03;
+
+	tmp = readb(mmio);
+
+	if (tmp & 0x01) {
+		ap->cbl = ATA_CBL_PATA40;
+		ap->udma_mask &= ATA_UDMA_MASK_40C;
+	} else
+		ap->cbl = ATA_CBL_PATA80;
+}
+
 static void pdc_pata_phy_reset(struct ata_port *ap)
 {
-	/* FIXME: add cable detect.  Don't assume 40-pin cable */
-	ap->cbl = ATA_CBL_PATA40;
-	ap->udma_mask &= ATA_UDMA_MASK_40C;
-
+	pdc_pata_cbl_detect(ap);
 	pdc_reset_port(ap);
 	ata_port_probe(ap);
 	ata_bus_reset(ap);
···
 	switch (qc->tf.protocol) {
 	case ATA_PROT_DMA:
 	case ATA_PROT_NODATA:
-		printk(KERN_ERR "ata%u: command timeout\n", ap->id);
+		ata_port_printk(ap, KERN_ERR, "command timeout\n");
 		drv_stat = ata_wait_idle(ap);
 		qc->err_mask |= __ac_err_mask(drv_stat);
 		break;
···
 	default:
 		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
 
-		printk(KERN_ERR "ata%u: unknown timeout, cmd 0x%x stat 0x%x\n",
-		       ap->id, qc->tf.command, drv_stat);
+		ata_port_printk(ap, KERN_ERR,
+				"unknown timeout, cmd 0x%x stat 0x%x\n",
+				qc->tf.command, drv_stat);
 
 		qc->err_mask |= ac_err_mask(drv_stat);
 		break;
···
 		ap = host_set->ports[i];
 		tmp = mask & (1 << (i + 1));
 		if (tmp && ap &&
-		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
 			struct ata_queued_cmd *qc;
 
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN)))
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 				handled += pdc_host_intr(ap, qc);
 		}
 	}
···
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
-	/*
-	 * If this driver happens to only be useful on Apple's K2, then
-	 * we should check that here as it has a normal Serverworks ID
-	 */
 	rc = pci_enable_device(pdev);
 	if (rc)
 		return rc;

drivers/scsi/sata_qstor.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"sata_qstor"
-#define DRV_VERSION	"0.05"
+#define DRV_VERSION	"0.06"
 
 enum {
 	QS_PORTS		= 4,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= QS_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.phy_reset		= qs_phy_reset,
 	.qc_prep		= qs_qc_prep,
 	.qc_issue		= qs_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
 	.eng_timeout		= qs_eng_timeout,
 	.irq_handler		= qs_intr,
 	.irq_clear		= qs_irq_clear,
···
 		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
 				  ATA_FLAG_SATA_RESET |
 				  //FIXME ATA_FLAG_SRST |
-				  ATA_FLAG_MMIO,
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING,
 		.pio_mask	= 0x10, /* pio4 */
 		.udma_mask	= 0x7f, /* udma0-6 */
 		.port_ops	= &qs_ata_ops,
···
 			DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x\n",
 					sff1, sff0, port_no, sHST, sDST);
 			handled = 1;
-			if (ap && !(ap->flags &
-				    (ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
 				struct ata_queued_cmd *qc;
 				struct qs_port_priv *pp = ap->private_data;
 				if (!pp || pp->state != qs_state_pkt)
 					continue;
 				qc = ata_qc_from_tag(ap, ap->active_tag);
-				if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+				if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 					switch (sHST) {
 					case 0: /* successful CPB */
 					case 3: /* device error */
···
 		struct ata_port *ap;
 		ap = host_set->ports[port_no];
 		if (ap &&
-		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
 			struct ata_queued_cmd *qc;
 			struct qs_port_priv *pp = ap->private_data;
 			if (!pp || pp->state != qs_state_mmio)
 				continue;
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 
 				/* check main status, clearing INTRQ */
 				u8 status = ata_check_status(ap);

drivers/scsi/sata_sil.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"sata_sil"
-#define DRV_VERSION	"0.9"
+#define DRV_VERSION	"1.0"
 
 enum {
 	/*
···
 	 */
 	SIL_FLAG_RERR_ON_DMA_ACT = (1 << 29),
 	SIL_FLAG_MOD15WRITE	= (1 << 30),
+
 	SIL_DFL_HOST_FLAGS	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO,
+				  ATA_FLAG_MMIO | ATA_FLAG_HRST_TO_RESUME,
 
 	/*
 	 * Controller IDs
···
 	/* BMDMA/BMDMA2 */
 	SIL_INTR_STEERING	= (1 << 1),
 
+	SIL_DMA_ENABLE		= (1 << 0),  /* DMA run switch */
+	SIL_DMA_RDWR		= (1 << 3),  /* DMA Rd-Wr */
+	SIL_DMA_SATA_IRQ	= (1 << 4),  /* OR of all SATA IRQs */
+	SIL_DMA_ACTIVE		= (1 << 16), /* DMA running */
+	SIL_DMA_ERROR		= (1 << 17), /* PCI bus error */
+	SIL_DMA_COMPLETE	= (1 << 18), /* cmd complete / IRQ pending */
+	SIL_DMA_N_SATA_IRQ	= (1 << 6),  /* SATA_IRQ for the next channel */
+	SIL_DMA_N_ACTIVE	= (1 << 24), /* ACTIVE for the next channel */
+	SIL_DMA_N_ERROR		= (1 << 25), /* ERROR for the next channel */
+	SIL_DMA_N_COMPLETE	= (1 << 26), /* COMPLETE for the next channel */
+
+	/* SIEN */
+	SIL_SIEN_N		= (1 << 16), /* triggered by SError.N */
+
 	/*
 	 * Others
 	 */
···
 static u32 sil_scr_read (struct ata_port *ap, unsigned int sc_reg);
 static void sil_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
 static void sil_post_set_mode (struct ata_port *ap);
+static irqreturn_t sil_interrupt(int irq, void *dev_instance,
+				 struct pt_regs *regs);
+static void sil_freeze(struct ata_port *ap);
+static void sil_thaw(struct ata_port *ap);
 
 
 static const struct pci_device_id sil_pci_tbl[] = {
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.check_status		= ata_check_status,
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
-	.probe_reset		= ata_std_probe_reset,
 	.post_set_mode		= sil_post_set_mode,
 	.bmdma_setup            = ata_bmdma_setup,
 	.bmdma_start            = ata_bmdma_start,
···
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
-	.eng_timeout		= ata_eng_timeout,
-	.irq_handler		= ata_interrupt,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= sil_freeze,
+	.thaw			= sil_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= sil_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
 	.scr_read		= sil_scr_read,
 	.scr_write		= sil_scr_write,
···
 	unsigned long tf;	/* ATA taskfile register block */
 	unsigned long ctl;	/* ATA control/altstatus register block */
 	unsigned long bmdma;	/* DMA register block */
+	unsigned long bmdma2;	/* DMA register block #2 */
 	unsigned long fifo_cfg;	/* FIFO Valid Byte Count and Control */
 	unsigned long scr;	/* SATA control register block */
 	unsigned long sien;	/* SATA Interrupt Enable register */
···
 	unsigned long sfis_cfg;	/* SATA FIS reception config register */
 } sil_port[] = {
 	/* port 0 ... */
-	{ 0x80, 0x8A, 0x00, 0x40, 0x100, 0x148, 0xb4, 0x14c },
-	{ 0xC0, 0xCA, 0x08, 0x44, 0x180, 0x1c8, 0xf4, 0x1cc },
-	{ 0x280, 0x28A, 0x200, 0x240, 0x300, 0x348, 0x2b4, 0x34c },
-	{ 0x2C0, 0x2CA, 0x208, 0x244, 0x380, 0x3c8, 0x2f4, 0x3cc },
+	{ 0x80, 0x8A, 0x00, 0x10, 0x40, 0x100, 0x148, 0xb4, 0x14c },
+	{ 0xC0, 0xCA, 0x08, 0x18, 0x44, 0x180, 0x1c8, 0xf4, 0x1cc },
+	{ 0x280, 0x28A, 0x200, 0x210, 0x240, 0x300, 0x348, 0x2b4, 0x34c },
+	{ 0x2C0, 0x2CA, 0x208, 0x218, 0x244, 0x380, 0x3c8, 0x2f4, 0x3cc },
 	/* ... port 3 */
 };
 
···
 
 	for (i = 0; i < 2; i++) {
 		dev = &ap->device[i];
-		if (!ata_dev_present(dev))
+		if (!ata_dev_enabled(dev))
 			dev_mode[i] = 0;	/* PIO0/1/2 */
 		else if (dev->flags & ATA_DFLAG_PIO)
 			dev_mode[i] = 1;	/* PIO3/4 */
···
 		writel(val, mmio);
 }
 
+static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
+{
+	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+	u8 status;
+
+	if (unlikely(bmdma2 & SIL_DMA_SATA_IRQ)) {
+		u32 serror;
+
+		/* SIEN doesn't mask SATA IRQs on some 3112s.  Those
+		 * controllers continue to assert IRQ as long as
+		 * SError bits are pending.  Clear SError immediately.
+		 */
+		serror = sil_scr_read(ap, SCR_ERROR);
+		sil_scr_write(ap, SCR_ERROR, serror);
+
+		/* Trigger hotplug and accumulate SError only if the
+		 * port isn't already frozen.  Otherwise, PHY events
+		 * during hardreset makes controllers with broken SIEN
+		 * repeat probing needlessly.
+		 */
+		if (!(ap->flags & ATA_FLAG_FROZEN)) {
+			ata_ehi_hotplugged(&ap->eh_info);
+			ap->eh_info.serror |= serror;
+		}
+
+		goto freeze;
+	}
+
+	if (unlikely(!qc || qc->tf.ctl & ATA_NIEN))
+		goto freeze;
+
+	/* Check whether we are expecting interrupt in this state */
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Some pre-ATAPI-4 devices assert INTRQ
+		 * at this state when ready to receive CDB.
+		 */
+
+		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
+		 * The flag was turned on only for atapi devices.
+		 * No need to check is_atapi_taskfile(&qc->tf) again.
+		 */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			goto err_hsm;
+		break;
+	case HSM_ST_LAST:
+		if (qc->tf.protocol == ATA_PROT_DMA ||
+		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
+			/* clear DMA-Start bit */
+			ap->ops->bmdma_stop(qc);
+
+			if (bmdma2 & SIL_DMA_ERROR) {
+				qc->err_mask |= AC_ERR_HOST_BUS;
+				ap->hsm_task_state = HSM_ST_ERR;
+			}
+		}
+		break;
+	case HSM_ST:
+		break;
+	default:
+		goto err_hsm;
+	}
+
+	/* check main status, clearing INTRQ */
+	status = ata_chk_status(ap);
+	if (unlikely(status & ATA_BUSY))
+		goto err_hsm;
+
+	/* ack bmdma irq events */
+	ata_bmdma_irq_clear(ap);
+
+	/* kick HSM in the ass */
+	ata_hsm_move(ap, qc, status, 0);
+
+	return;
+
+ err_hsm:
+	qc->err_mask |= AC_ERR_HSM;
+ freeze:
+	ata_port_freeze(ap);
+}
+
+static irqreturn_t sil_interrupt(int irq, void *dev_instance,
+				 struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	void __iomem *mmio_base = host_set->mmio_base;
+	int handled = 0;
+	int i;
+
+	spin_lock(&host_set->lock);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+		u32 bmdma2 = readl(mmio_base + sil_port[ap->port_no].bmdma2);
+
+		if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED))
+			continue;
+
+		if (bmdma2 == 0xffffffff ||
+		    !(bmdma2 & (SIL_DMA_COMPLETE | SIL_DMA_SATA_IRQ)))
+			continue;
+
+		sil_host_intr(ap, bmdma2);
+		handled = 1;
+	}
+
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+static void sil_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	u32 tmp;
+
+	/* global IRQ mask doesn't block SATA IRQ, turn off explicitly */
+	writel(0, mmio_base + sil_port[ap->port_no].sien);
+
+	/* plug IRQ */
+	tmp = readl(mmio_base + SIL_SYSCFG);
+	tmp |= SIL_MASK_IDE0_INT << ap->port_no;
+	writel(tmp, mmio_base + SIL_SYSCFG);
+	readl(mmio_base + SIL_SYSCFG);	/* flush */
+}
+
+static void sil_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	u32 tmp;
+
+	/* clear IRQ */
+	ata_chk_status(ap);
+	ata_bmdma_irq_clear(ap);
+
+	/* turn on SATA IRQ */
+	writel(SIL_SIEN_N, mmio_base + sil_port[ap->port_no].sien);
+
+	/* turn on IRQ */
+	tmp = readl(mmio_base + SIL_SYSCFG);
+	tmp &= ~(SIL_MASK_IDE0_INT << ap->port_no);
+	writel(tmp, mmio_base + SIL_SYSCFG);
+}
+
 /**
  *	sil_dev_config - Apply device/host-specific errata fixups
  *	@ap: Port containing device to be examined
···
 	if (slow_down ||
 	    ((ap->flags & SIL_FLAG_MOD15WRITE) &&
 	     (quirks & SIL_QUIRK_MOD15WRITE))) {
-		printk(KERN_INFO "ata%u(%u): applying Seagate errata fix (mod15write workaround)\n",
-		       ap->id, dev->devno);
+		ata_dev_printk(dev, KERN_INFO, "applying Seagate errata fix "
+			       "(mod15write workaround)\n");
 		dev->max_sectors = 15;
 		return;
 	}
 
 	/* limit to udma5 */
 	if (quirks & SIL_QUIRK_UDMA5MAX) {
-		printk(KERN_INFO "ata%u(%u): applying Maxtor errata fix %s\n",
-		       ap->id, dev->devno, model_num);
+		ata_dev_printk(dev, KERN_INFO,
+			       "applying Maxtor errata fix %s\n", model_num);
 		dev->udma_mask &= ATA_UDMA5;
 		return;
 	}
···
 	int rc;
 	unsigned int i;
 	int pci_dev_busy = 0;
-	u32 tmp, irq_mask;
+	u32 tmp;
 	u8 cls;
 
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
-	/*
-	 * If this driver happens to only be useful on Apple's K2, then
-	 * we should check that here as it has a normal Serverworks ID
-	 */
 	rc = pci_enable_device(pdev);
 	if (rc)
 		return rc;
···
 	}
 
 	if (ent->driver_data == sil_3114) {
-		irq_mask = SIL_MASK_4PORT;
-
 		/* flip the magic "make 4 ports work" bit */
 		tmp = readl(mmio_base + sil_port[2].bmdma);
 		if ((tmp & SIL_INTR_STEERING) == 0)
 			writel(tmp | SIL_INTR_STEERING,
 			       mmio_base + sil_port[2].bmdma);
-
-	} else {
-		irq_mask = SIL_MASK_2PORT;
 	}
-
-	/* make sure IDE0/1/2/3 interrupts are not masked */
-	tmp = readl(mmio_base + SIL_SYSCFG);
-	if (tmp & irq_mask) {
-		tmp &= ~irq_mask;
-		writel(tmp, mmio_base + SIL_SYSCFG);
-		readl(mmio_base + SIL_SYSCFG);	/* flush */
-	}
-
-	/* mask all SATA phy-related interrupts */
-	/* TODO: unmask bit 6 (SError N bit) for hotplug */
-	for (i = 0; i < probe_ent->n_ports; i++)
-		writel(0, mmio_base + sil_port[i].sien);
 
 	pci_set_master(pdev);
 

drivers/scsi/sata_sil24.c

···
 #include <asm/io.h>
 
 #define DRV_NAME	"sata_sil24"
-#define DRV_VERSION	"0.23"
+#define DRV_VERSION	"0.24"
 
 /*
  * Port request block (PRB) 32 bytes
  */
 struct sil24_prb {
-	u16	ctrl;
-	u16	prot;
-	u32	rx_cnt;
+	__le16	ctrl;
+	__le16	prot;
+	__le32	rx_cnt;
 	u8	fis[6 * 4];
 };
 
···
  * Scatter gather entry (SGE) 16 bytes
  */
 struct sil24_sge {
-	u64	addr;
-	u32	cnt;
-	u32	flags;
+	__le64	addr;
+	__le32	cnt;
+	__le32	flags;
 };
 
 /*
  * Port multiplier
  */
 struct sil24_port_multiplier {
-	u32	diag;
-	u32	sactive;
+	__le32	diag;
+	__le32	sactive;
 };
 
 enum {
···
 	/* HOST_SLOT_STAT bits */
 	HOST_SSTAT_ATTN		= (1 << 31),
 
+	/* HOST_CTRL bits */
+	HOST_CTRL_M66EN		= (1 << 16), /* M66EN PCI bus signal */
+	HOST_CTRL_TRDY		= (1 << 17), /* latched PCI TRDY */
+	HOST_CTRL_STOP		= (1 << 18), /* latched PCI STOP */
+	HOST_CTRL_DEVSEL	= (1 << 19), /* latched PCI DEVSEL */
+	HOST_CTRL_REQ64		= (1 << 20), /* latched PCI REQ64 */
+
 	/*
 	 * Port registers
 	 * (8192 bytes @ +0x0000, +0x2000, +0x4000 and +0x6000 @ BAR2)
 	 */
 	PORT_REGS_SIZE		= 0x2000,
-	PORT_PRB		= 0x0000, /* (32 bytes PRB + 16 bytes SGEs * 6) * 31 (3968 bytes) */
+
+	PORT_LRAM		= 0x0000, /* 31 LRAM slots and PM regs */
+	PORT_LRAM_SLOT_SZ	= 0x0080, /* 32 bytes PRB + 2 SGE, ACT... */
 
 	PORT_PM			= 0x0f80, /* 8 bytes PM * 16 (128 bytes) */
 		/* 32 bit regs */
···
 	PORT_IRQ_PWR_CHG	= (1 << 3), /* power management change */
 	PORT_IRQ_PHYRDY_CHG	= (1 << 4), /* PHY ready change */
 	PORT_IRQ_COMWAKE	= (1 << 5), /* COMWAKE received */
-	PORT_IRQ_UNK_FIS	= (1 << 6), /* Unknown FIS received */
-	PORT_IRQ_SDB_FIS	= (1 << 11), /* SDB FIS received */
+	PORT_IRQ_UNK_FIS	= (1 << 6), /* unknown FIS received */
+	PORT_IRQ_DEV_XCHG	= (1 << 7), /* device exchanged */
+	PORT_IRQ_8B10B		= (1 << 8), /* 8b/10b decode error threshold */
+	PORT_IRQ_CRC		= (1 << 9), /* CRC error threshold */
+	PORT_IRQ_HANDSHAKE	= (1 << 10), /* handshake error threshold */
+	PORT_IRQ_SDB_NOTIFY	= (1 << 11), /* SDB notify received */
+
+	DEF_PORT_IRQ		= PORT_IRQ_COMPLETE | PORT_IRQ_ERROR |
+				  PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG |
+				  PORT_IRQ_UNK_FIS,
 
 	/* bits[27:16] are unmasked (raw) */
 	PORT_IRQ_RAW_SHIFT	= 16,
···
 	PORT_CERR_CMD_PCIPERR	= 27, /* ctrl[15:13] 110 - PCI parity err while fetching PRB */
 	PORT_CERR_XFR_UNDEF	= 32, /* PSD ecode 00 - undefined */
 	PORT_CERR_XFR_TGTABRT	= 33, /* PSD ecode 01 - target abort */
-	PORT_CERR_XFR_MSGABRT	= 34, /* PSD ecode 10 - master abort */
+	PORT_CERR_XFR_MSTABRT	= 34, /* PSD ecode 10 - master abort */
 	PORT_CERR_XFR_PCIPERR	= 35, /* PSD ecode 11 - PCI prity err during transfer */
 	PORT_CERR_SENDSERVICE	= 36, /* FIS received while sending service */
 
···
 	SGE_DRD			= (1 << 29), /* discard data read (/dev/null)
 						data address ignored */
 
+	SIL24_MAX_CMDS		= 31,
+
 	/* board id */
 	BID_SIL3124		= 0,
 	BID_SIL3132		= 1,
 	BID_SIL3131		= 2,
+
+	/* host flags */
+	SIL24_COMMON_FLAGS	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_NCQ | ATA_FLAG_SKIP_D2H_BSY,
+	SIL24_FLAG_PCIX_IRQ_WOC	= (1 << 24), /* IRQ loss errata on PCI-X */
 
 	IRQ_STAT_4PORTS		= 0xf,
 };
···
 union sil24_cmd_block {
 	struct sil24_ata_block ata;
 	struct sil24_atapi_block atapi;
+};
+
+static struct sil24_cerr_info {
+	unsigned int err_mask, action;
+	const char *desc;
+} sil24_cerr_db[] = {
+	[0]			= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error" },
+	[PORT_CERR_DEV]		= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error via D2H FIS" },
+	[PORT_CERR_SDB]		= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error via SDB FIS" },
+	[PORT_CERR_DATA]	= { AC_ERR_ATA_BUS, ATA_EH_SOFTRESET,
+				    "error in data FIS" },
+	[PORT_CERR_SEND]	= { AC_ERR_ATA_BUS, ATA_EH_SOFTRESET,
+				    "failed to transmit command FIS" },
+	[PORT_CERR_INCONSISTENT] = { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				     "protocol mismatch" },
+	[PORT_CERR_DIRECTION]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "data directon mismatch" },
+	[PORT_CERR_UNDERRUN]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "ran out of SGEs while writing" },
+	[PORT_CERR_OVERRUN]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "ran out of SGEs while reading" },
+	[PORT_CERR_PKT_PROT]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "invalid data directon for ATAPI CDB" },
+	[PORT_CERR_SGT_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_SOFTRESET,
+				     "SGT no on qword boundary" },
+	[PORT_CERR_SGT_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while fetching SGT" },
+	[PORT_CERR_SGT_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while fetching SGT" },
+	[PORT_CERR_SGT_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while fetching SGT" },
+	[PORT_CERR_CMD_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_SOFTRESET,
+				     "PRB not on qword boundary" },
+	[PORT_CERR_CMD_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while fetching PRB" },
+	[PORT_CERR_CMD_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while fetching PRB" },
+	[PORT_CERR_CMD_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while fetching PRB" },
+	[PORT_CERR_XFR_UNDEF]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "undefined error while transferring data" },
+	[PORT_CERR_XFR_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while transferring data" },
+	[PORT_CERR_XFR_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while transferring data" },
+	[PORT_CERR_XFR_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while transferring data" },
+	[PORT_CERR_SENDSERVICE]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "FIS received while sending service FIS" },
 };
 
 /*
···
 static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg);
 static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val);
 static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
-static int sil24_probe_reset(struct ata_port *ap, unsigned int *classes);
 static void sil24_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
 static void sil24_irq_clear(struct ata_port *ap);
-static void sil24_eng_timeout(struct ata_port *ap);
 static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
+static void sil24_freeze(struct ata_port *ap);
+static void sil24_thaw(struct ata_port *ap);
+static void sil24_error_handler(struct ata_port *ap);
+static void sil24_post_internal_cmd(struct ata_queued_cmd *qc);
 static int sil24_port_start(struct ata_port *ap);
 static void sil24_port_stop(struct ata_port *ap);
 static void sil24_host_stop(struct ata_host_set *host_set);
···
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.can_queue		= ATA_DEF_QUEUE,
+	.change_queue_depth	= ata_scsi_change_queue_depth,
+	.can_queue		= SIL24_MAX_CMDS,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 
 	.tf_read		= sil24_tf_read,
 
-	.probe_reset		= sil24_probe_reset,
-
 	.qc_prep		= sil24_qc_prep,
 	.qc_issue		= sil24_qc_issue,
-
-	.eng_timeout		= sil24_eng_timeout,
 
 	.irq_handler		= sil24_interrupt,
 	.irq_clear		= sil24_irq_clear,
 
 	.scr_read		= sil24_scr_read,
 	.scr_write		= sil24_scr_write,
+
+	.freeze			= sil24_freeze,
+	.thaw			= sil24_thaw,
+	.error_handler		= sil24_error_handler,
+	.post_internal_cmd	= sil24_post_internal_cmd,
 
 	.port_start		= sil24_port_start,
 	.port_stop		= sil24_port_stop,
···
 	/* sil_3124 */
 	{
 		.sht		= &sil24_sht,
-		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-				  SIL24_NPORTS2FLAG(4),
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4) |
+				  SIL24_FLAG_PCIX_IRQ_WOC,
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
 		.udma_mask	= 0x3f,			/* udma0-5 */
···
 	/* sil_3132 */
 	{
 		.sht		= &sil24_sht,
-		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-				  SIL24_NPORTS2FLAG(2),
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(2),
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
 		.udma_mask	= 0x3f,			/* udma0-5 */
···
 	/* sil_3131/sil_3531 */
 	{
 		.sht		= &sil24_sht,
-		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-				  SIL24_NPORTS2FLAG(1),
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(1),
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
 		.udma_mask	= 0x3f,			/* udma0-5 */
 		.port_ops	= &sil24_ops,
 	},
 };
+
+static int sil24_tag(int tag)
+{
+	if (unlikely(ata_tag_internal(tag)))
+		return 0;
+	return tag;
+}
 
 static void sil24_dev_config(struct ata_port *ap, struct ata_device *dev)
 {
···
 	*tf = pp->tf;
 }
 
-static int sil24_softreset(struct ata_port *ap, int verbose,
-			   unsigned int *class)
+static int sil24_init_port(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	u32 tmp;
+
+	writel(PORT_CS_INIT, port + PORT_CTRL_STAT);
+	ata_wait_register(port + PORT_CTRL_STAT,
+			  PORT_CS_INIT, PORT_CS_INIT, 10, 100);
+	tmp = ata_wait_register(port + PORT_CTRL_STAT,
+				PORT_CS_RDY, 0, 10, 100);
+
+	if ((tmp & (PORT_CS_INIT | PORT_CS_RDY)) != PORT_CS_RDY)
+		return -EIO;
+	return 0;
+}
+
+static int sil24_softreset(struct ata_port *ap, unsigned int *class)
 {
 	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
 	struct sil24_port_priv *pp = ap->private_data;
 	struct sil24_prb *prb = &pp->cmd_block[0].ata.prb;
 	dma_addr_t paddr = pp->cmd_block_dma;
-	unsigned long timeout = jiffies + ATA_TMOUT_BOOT * HZ;
-	u32 irq_enable, irq_stat;
+	u32 mask, irq_stat;
+	const char *reason;
 
 	DPRINTK("ENTER\n");
 
-	if (!sata_dev_present(ap)) {
+	if (ata_port_offline(ap)) {
 		DPRINTK("PHY reports no device\n");
 		*class = ATA_DEV_NONE;
 		goto out;
 	}
 
-	/* temporarily turn off IRQs during SRST */
-	irq_enable = readl(port + PORT_IRQ_ENABLE_SET);
-	writel(irq_enable, port + PORT_IRQ_ENABLE_CLR);
+	/* put the port into known state */
+	if (sil24_init_port(ap)) {
+		reason ="port not ready";
+		goto err;
+	}
 
-	/*
-	 * XXX: Not sure whether the following sleep is needed or not.
-	 * The original driver had it.  So....
-	 */
-	msleep(10);
-
+	/* do SRST */
 	prb->ctrl = cpu_to_le16(PRB_CTRL_SRST);
 	prb->fis[1] = 0; /* no PM yet */
 
 	writel((u32)paddr, port + PORT_CMD_ACTIVATE);
+	writel((u64)paddr >> 32, port + PORT_CMD_ACTIVATE + 4);
 
-	do {
-		irq_stat = readl(port + PORT_IRQ_STAT);
-		writel(irq_stat, port + PORT_IRQ_STAT);		/* clear irq */
+	mask = (PORT_IRQ_COMPLETE | PORT_IRQ_ERROR) << PORT_IRQ_RAW_SHIFT;
+	irq_stat = ata_wait_register(port + PORT_IRQ_STAT, mask, 0x0,
+				     100, ATA_TMOUT_BOOT / HZ * 1000);
 
-		irq_stat >>= PORT_IRQ_RAW_SHIFT;
-		if (irq_stat & (PORT_IRQ_COMPLETE | PORT_IRQ_ERROR))
-			break;
-
-		msleep(100);
-	} while (time_before(jiffies, timeout));
-
-	/* restore IRQs */
-	writel(irq_enable, port + PORT_IRQ_ENABLE_SET);
+	writel(irq_stat, port + PORT_IRQ_STAT); /* clear IRQs */
+	irq_stat >>= PORT_IRQ_RAW_SHIFT;
 
 	if (!(irq_stat & PORT_IRQ_COMPLETE)) {
-		DPRINTK("EXIT, srst failed\n");
-		return -EIO;
+		if (irq_stat & PORT_IRQ_ERROR)
+			reason = "SRST command error";
+		else
+			reason = "timeout";
+		goto err;
 	}
 
 	sil24_update_tf(ap);
···
  out:
 	DPRINTK("EXIT, class=%u\n", *class);
 	return 0;
+
+ err:
+	ata_port_printk(ap, KERN_ERR, "softreset failed (%s)\n", reason);
+	return -EIO;
 }
 
-static int sil24_hardreset(struct ata_port *ap, int verbose,
-			   unsigned int *class)
+static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
 {
-	unsigned int dummy_class;
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	const char *reason;
+	int tout_msec, rc;
+	u32 tmp;
 
-	/* sil24 doesn't report device signature after hard reset */
-	return sata_std_hardreset(ap, verbose, &dummy_class);
-}
+	/* sil24 does the right thing(tm) without any protection */
+	sata_set_spd(ap);
 
-static int sil24_probe_reset(struct ata_port *ap, unsigned int *classes)
-{
-	return ata_drive_probe_reset(ap, ata_std_probeinit,
-				     sil24_softreset, sil24_hardreset,
-				     ata_std_postreset, classes);
+	tout_msec = 100;
+	if (ata_port_online(ap))
+		tout_msec = 5000;
+
+	writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
+	tmp = ata_wait_register(port + PORT_CTRL_STAT,
+				PORT_CS_DEV_RST, PORT_CS_DEV_RST, 10, tout_msec);
+
+	/* SStatus oscillates between zero and valid status after
+	 * DEV_RST, debounce it.
+	 */
+	rc = sata_phy_debounce(ap, sata_deb_timing_before_fsrst);
+	if (rc) {
+		reason = "PHY debouncing failed";
+		goto err;
+	}
+
+	if (tmp & PORT_CS_DEV_RST) {
+		if (ata_port_offline(ap))
+			return 0;
+		reason = "link not ready";
+		goto err;
+	}
+
+	/* Sil24 doesn't store signature FIS after hardreset, so we
+	 * can't wait for BSY to clear.  Some devices take a long time
+	 * to get ready and those devices will choke if we don't wait
+	 * for BSY clearance here.  Tell libata to perform follow-up
+	 * softreset.
+	 */
+	return -EAGAIN;
+
+ err:
+	ata_port_printk(ap, KERN_ERR, "hardreset failed (%s)\n", reason);
+	return -EIO;
 }
 
 static inline void sil24_fill_sg(struct ata_queued_cmd *qc,
···
 {
 	struct ata_port *ap = qc->ap;
 	struct sil24_port_priv *pp = ap->private_data;
-	union sil24_cmd_block *cb = pp->cmd_block + qc->tag;
+	union sil24_cmd_block *cb;
 	struct sil24_prb *prb;
 	struct sil24_sge *sge;
+	u16 ctrl = 0;
+
+	cb = &pp->cmd_block[sil24_tag(qc->tag)];
 
 	switch (qc->tf.protocol) {
 	case ATA_PROT_PIO:
 	case ATA_PROT_DMA:
+	case ATA_PROT_NCQ:
 	case ATA_PROT_NODATA:
 		prb = &cb->ata.prb;
 		sge = cb->ata.sge;
-		prb->ctrl = 0;
 		break;
 
 	case ATA_PROT_ATAPI:
···
 
 		if (qc->tf.protocol != ATA_PROT_ATAPI_NODATA) {
 			if (qc->tf.flags & ATA_TFLAG_WRITE)
-				prb->ctrl = cpu_to_le16(PRB_CTRL_PACKET_WRITE);
+				ctrl = PRB_CTRL_PACKET_WRITE;
 			else
-				prb->ctrl = cpu_to_le16(PRB_CTRL_PACKET_READ);
-		} else
-			prb->ctrl = 0;
-
+				ctrl = PRB_CTRL_PACKET_READ;
+		}
 		break;
 
 	default:
···
 		BUG();
 	}
 
+	prb->ctrl = cpu_to_le16(ctrl);
 	ata_tf_to_fis(&qc->tf, prb->fis, 0);
 
 	if (qc->flags & ATA_QCFLAG_DMAMAP)
···
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
-	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
 	struct sil24_port_priv *pp = ap->private_data;
-	dma_addr_t paddr = pp->cmd_block_dma + qc->tag * sizeof(*pp->cmd_block);
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	unsigned int tag = sil24_tag(qc->tag);
+	dma_addr_t paddr;
+	void __iomem *activate;
 
-	writel((u32)paddr, port + PORT_CMD_ACTIVATE);
+	paddr = pp->cmd_block_dma + tag * sizeof(*pp->cmd_block);
+	activate = port + PORT_CMD_ACTIVATE + tag * 8;
+
+	writel((u32)paddr, activate);
+	writel((u64)paddr >> 32, activate + 4);
+
 	return 0;
 }
 
···
 	/* unused */
 }
 
-static int __sil24_restart_controller(void __iomem *port)
+static void sil24_freeze(struct ata_port *ap)
 {
-	u32 tmp;
-	int cnt;
-
-	writel(PORT_CS_INIT, port + PORT_CTRL_STAT);
-
-	/* Max ~10ms */
-	for (cnt = 0; cnt < 10000; cnt++) {
-		tmp = readl(port + PORT_CTRL_STAT);
-		if (tmp & PORT_CS_RDY)
-			return 0;
-		udelay(1);
-	}
-
-	return -1;
-}
-
-static void sil24_restart_controller(struct ata_port *ap)
-{
-	if (__sil24_restart_controller((void __iomem *)ap->ioaddr.cmd_addr))
-		printk(KERN_ERR DRV_NAME
-		       " ata%u: failed to restart controller\n", ap->id);
-}
-
-static int __sil24_reset_controller(void __iomem *port)
-{
-	int cnt;
-	u32 tmp;
-
-	/* Reset controller state.  Is this correct? */
-	writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
-	readl(port + PORT_CTRL_STAT);	/* sync */
-
-	/* Max ~100ms */
-	for (cnt = 0; cnt < 1000; cnt++) {
-		udelay(100);
-		tmp = readl(port + PORT_CTRL_STAT);
-		if (!(tmp & PORT_CS_DEV_RST))
-			break;
-	}
-
-	if (tmp & PORT_CS_DEV_RST)
-		return -1;
-
-	if (tmp & PORT_CS_RDY)
-		return 0;
-
-	return __sil24_restart_controller(port);
-}
-
-static void sil24_reset_controller(struct ata_port *ap)
-{
-	printk(KERN_NOTICE DRV_NAME
-	       " ata%u: resetting controller...\n", ap->id);
-	if (__sil24_reset_controller((void __iomem *)ap->ioaddr.cmd_addr))
-                printk(KERN_ERR DRV_NAME
-                       " ata%u: failed to reset controller\n", ap->id);
-}
-
-static void sil24_eng_timeout(struct ata_port *ap)
-{
-	struct ata_queued_cmd *qc;
-
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-
-	printk(KERN_ERR "ata%u: command timeout\n", ap->id);
-	qc->err_mask |= AC_ERR_TIMEOUT;
-	ata_eh_qc_complete(qc);
-
-	sil24_reset_controller(ap);
-}
-
-static void sil24_error_intr(struct ata_port *ap, u32 slot_stat)
-{
-	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
-	struct sil24_port_priv *pp = ap->private_data;
 	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
-	u32 irq_stat, cmd_err, sstatus, serror;
-	unsigned int err_mask;
 
-	irq_stat = readl(port + PORT_IRQ_STAT);
-	writel(irq_stat, port + PORT_IRQ_STAT);		/* clear irq */
-
-	if (!(irq_stat & PORT_IRQ_ERROR)) {
-		/* ignore non-completion, non-error irqs for now */
-		printk(KERN_WARNING DRV_NAME
-		       "ata%u: non-error exception irq (irq_stat %x)\n",
-		       ap->id, irq_stat);
-		return;
-	}
-
-	cmd_err = readl(port + PORT_CMD_ERR);
-	sstatus = readl(port + PORT_SSTATUS);
-	serror = readl(port + PORT_SERROR);
-	if (serror)
-		writel(serror, port + PORT_SERROR);
-
-	/*
-	 * Don't log ATAPI device errors.  They're supposed to happen
-	 * and any serious errors will be logged using sense data by
-	 * the SCSI layer.
+	/* Port-wide IRQ mask in HOST_CTRL doesn't really work, clear
+	 * PORT_IRQ_ENABLE instead.
 	 */
-	if (ap->device[0].class != ATA_DEV_ATAPI || cmd_err > PORT_CERR_SDB)
-		printk("ata%u: error interrupt on port%d\n"
-		       "  stat=0x%x irq=0x%x cmd_err=%d sstatus=0x%x serror=0x%x\n",
-		       ap->id, ap->port_no, slot_stat, irq_stat, cmd_err, sstatus, serror);
+	writel(0xffff, port + PORT_IRQ_ENABLE_CLR);
+}
 
-	if (cmd_err == PORT_CERR_DEV || cmd_err == PORT_CERR_SDB) {
-		/*
-		 * Device is reporting error, tf registers are valid.
-		 */
-		sil24_update_tf(ap);
-		err_mask = ac_err_mask(pp->tf.command);
-		sil24_restart_controller(ap);
-	} else {
-		/*
-		 * Other errors.  libata currently doesn't have any
-		 * mechanism to report these errors.  Just turn on
-		 * ATA_ERR.
-		 */
-		err_mask = AC_ERR_OTHER;
-		sil24_reset_controller(ap);
+static void sil24_thaw(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	u32 tmp;
+
+	/* clear IRQ */
+	tmp = readl(port + PORT_IRQ_STAT);
+	writel(tmp, port + PORT_IRQ_STAT);
+
+	/* turn IRQ back on */
+	writel(DEF_PORT_IRQ, port + PORT_IRQ_ENABLE_SET);
+}
+
+static void sil24_error_intr(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	struct ata_eh_info *ehi = &ap->eh_info;
+	int freeze = 0;
+	u32 irq_stat;
+
+	/* on error, we need to clear IRQ explicitly */
+	irq_stat = readl(port + PORT_IRQ_STAT);
+	writel(irq_stat, port + PORT_IRQ_STAT);
+
+	/* first, analyze and record host port events */
+	ata_ehi_clear_desc(ehi);
+
+	ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
+
+	if (irq_stat & (PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG)) {
+		ata_ehi_hotplugged(ehi);
+		ata_ehi_push_desc(ehi, ", %s",
+			       irq_stat & PORT_IRQ_PHYRDY_CHG ?
+			       "PHY RDY changed" : "device exchanged");
+		freeze = 1;
 	}
 
-	if (qc) {
-		qc->err_mask |= err_mask;
-		ata_qc_complete(qc);
+	if (irq_stat & PORT_IRQ_UNK_FIS) {
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi , ", unknown FIS");
+		freeze = 1;
 	}
+
+	/* deal with command error */
+	if (irq_stat & PORT_IRQ_ERROR) {
+		struct sil24_cerr_info *ci = NULL;
+		unsigned int err_mask = 0, action = 0;
+		struct ata_queued_cmd *qc;
+		u32 cerr;
+
+		/* analyze CMD_ERR */
+		cerr = readl(port + PORT_CMD_ERR);
+		if (cerr < ARRAY_SIZE(sil24_cerr_db))
+			ci = &sil24_cerr_db[cerr];
+
+		if (ci && ci->desc) {
+			err_mask |= ci->err_mask;
+			action |= ci->action;
+			ata_ehi_push_desc(ehi, ", %s", ci->desc);
+		} else {
+			err_mask |= AC_ERR_OTHER;
+			action |= ATA_EH_SOFTRESET;
+			ata_ehi_push_desc(ehi, ", unknown command error %d",
+					  cerr);
+		}
+
+		/* record error info */
+		qc = ata_qc_from_tag(ap, ap->active_tag);
+		if (qc) {
+			sil24_update_tf(ap);
+			qc->err_mask |= err_mask;
+		} else
+			ehi->err_mask |= err_mask;
+
+		ehi->action |= action;
+	}
+
+	/* freeze or abort */
+	if (freeze)
+		ata_port_freeze(ap);
+	else
+		ata_port_abort(ap);
+}
+
+static void sil24_finish_qc(struct ata_queued_cmd *qc)
+{
+	if (qc->flags & ATA_QCFLAG_RESULT_TF)
+		sil24_update_tf(qc->ap);
 }
 
 static inline void sil24_host_intr(struct ata_port *ap)
 {
-	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
 	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
-	u32 slot_stat;
+	u32 slot_stat, qc_active;
+	int rc;
 
 	slot_stat = readl(port + PORT_SLOT_STAT);
-	if (!(slot_stat & HOST_SSTAT_ATTN)) {
-		struct sil24_port_priv *pp = ap->private_data;
-		/*
-		 * !HOST_SSAT_ATTN guarantees successful completion,
-		 * so reading back tf registers is unnecessary for
-		 * most commands.  TODO: read tf registers for
-		 * commands which require these values on successful
-		 * completion (EXECUTE DEVICE DIAGNOSTIC, CHECK POWER,
-		 * DEVICE RESET and READ PORT MULTIPLIER (any more?).
-		 */
-		sil24_update_tf(ap);
 
-		if (qc) {
-			qc->err_mask |= ac_err_mask(pp->tf.command);
-			ata_qc_complete(qc);
-		}
-	} else
-		sil24_error_intr(ap, slot_stat);
+	if (unlikely(slot_stat & HOST_SSTAT_ATTN)) {
+		sil24_error_intr(ap);
+		return;
+	}
+
+	if (ap->flags & SIL24_FLAG_PCIX_IRQ_WOC)
+		writel(PORT_IRQ_COMPLETE, port + PORT_IRQ_STAT);
+
+	qc_active = slot_stat & ~HOST_SSTAT_ATTN;
+	rc = ata_qc_complete_multiple(ap, qc_active, sil24_finish_qc);
+	if (rc > 0)
+		return;
+	if (rc < 0) {
+		struct ata_eh_info *ehi = &ap->eh_info;
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_port_freeze(ap);
+		return;
+	}
+
+	if (ata_ratelimit())
+		ata_port_printk(ap, KERN_INFO, "spurious interrupt "
+			"(slot_stat 0x%x active_tag %d sactive 0x%x)\n",
+			slot_stat, ap->active_tag, ap->sactive);
 }
 
 static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
···
 	for (i = 0; i < host_set->n_ports; i++)
 		if (status & (1 << i)) {
 			struct ata_port *ap = host_set->ports[i];
-			if (ap && !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
 				sil24_host_intr(host_set->ports[i]);
 				handled++;
 			} else
···
 	return IRQ_RETVAL(handled);
 }
 
+static void sil24_error_handler(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+
+	if (sil24_init_port(ap)) {
+		ata_eh_freeze_port(ap);
+		ehc->i.action |= ATA_EH_HARDRESET;
+	}
+
+	/* perform recovery */
+	ata_do_eh(ap, ata_std_prereset, sil24_softreset, sil24_hardreset,
+		  ata_std_postreset);
+}
+
+static void sil24_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		qc->err_mask |= AC_ERR_OTHER;
+
+	/* make DMA engine forget about the failed command */
+	if (qc->err_mask)
+		sil24_init_port(ap);
+}
+
 static inline void sil24_cblk_free(struct sil24_port_priv *pp, struct device *dev)
 {
-	const size_t cb_size = sizeof(*pp->cmd_block);
+	const size_t cb_size = sizeof(*pp->cmd_block) * SIL24_MAX_CMDS;
 
 	dma_free_coherent(dev, cb_size, pp->cmd_block, pp->cmd_block_dma);
 }
···
 	struct device *dev = ap->host_set->dev;
 	struct sil24_port_priv *pp;
 	union sil24_cmd_block *cb;
-	size_t cb_size = sizeof(*cb);
+	size_t cb_size = sizeof(*cb) * SIL24_MAX_CMDS;
 	dma_addr_t cb_dma;
 	int rc = -ENOMEM;
 
···
 	void __iomem *host_base = NULL;
 	void __iomem *port_base = NULL;
 	int i, rc;
+	u32 tmp;
 
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
···
 	/*
 	 * Configure the device
 	 */
-	/*
-	 * FIXME: This device is certainly 64-bit capable.  We just
-	 * don't know how to use it.  After fixing 32bit activation in
-	 * this function, enable 64bit masks here.
-	 */
-	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
-	if (rc) {
-		dev_printk(KERN_ERR, &pdev->dev,
-			   "32-bit DMA enable failed\n");
-		goto out_free;
-	}
-	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
-	if (rc) {
-		dev_printk(KERN_ERR, &pdev->dev,
-			   "32-bit consistent DMA enable failed\n");
-		goto out_free;
+	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+		rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+		if (rc) {
+			rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+			if (rc) {
+				dev_printk(KERN_ERR, &pdev->dev,
+					   "64-bit DMA enable failed\n");
+				goto out_free;
+			}
+		}
+	} else {
+		rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit DMA enable failed\n");
+			goto out_free;
+		}
+		rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit consistent DMA enable failed\n");
+			goto out_free;
+		}
 	}
 
 	/* GPIO off */
 	writel(0, host_base + HOST_FLASH_CMD);
 
-	/* Mask interrupts during initialization */
+	/* Apply workaround for completion IRQ loss on PCI-X errata */
+	if (probe_ent->host_flags & SIL24_FLAG_PCIX_IRQ_WOC) {
+		tmp = readl(host_base + HOST_CTRL);
+		if (tmp & (HOST_CTRL_TRDY | HOST_CTRL_STOP | HOST_CTRL_DEVSEL))
+			dev_printk(KERN_INFO, &pdev->dev,
+				   "Applying completion IRQ loss on PCI-X "
+				   "errata fix\n");
+		else
+			probe_ent->host_flags &= ~SIL24_FLAG_PCIX_IRQ_WOC;
+	}
+
+	/* clear global reset & mask interrupts during initialization */
 	writel(0, host_base + HOST_CTRL);
 
 	for (i = 0; i < probe_ent->n_ports; i++) {
 		void __iomem *port = port_base + i * PORT_REGS_SIZE;
 		unsigned long portu = (unsigned long)port;
-		u32 tmp;
-		int cnt;
 
-		probe_ent->port[i].cmd_addr = portu + PORT_PRB;
+		probe_ent->port[i].cmd_addr = portu;
 		probe_ent->port[i].scr_addr = portu + PORT_SCONTROL;
 
 		ata_std_ports(&probe_ent->port[i]);
···
 		tmp = readl(port + PORT_CTRL_STAT);
 		if (tmp & PORT_CS_PORT_RST) {
 			writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
-			readl(port + PORT_CTRL_STAT);	/* sync */
-			for (cnt = 0; cnt < 10; cnt++) {
-				msleep(10);
-				tmp = readl(port + PORT_CTRL_STAT);
-				if (!(tmp & PORT_CS_PORT_RST))
-					break;
-			}
+			tmp = ata_wait_register(port + PORT_CTRL_STAT,
+						PORT_CS_PORT_RST,
+						PORT_CS_PORT_RST, 10, 100);
 			if (tmp & PORT_CS_PORT_RST)
 				dev_printk(KERN_ERR, &pdev->dev,
 				           "failed to clear port RST\n");
 		}
+
+		/* Configure IRQ WoC */
+		if (probe_ent->host_flags & SIL24_FLAG_PCIX_IRQ_WOC)
+			writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
+		else
+			writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
 
 		/* Zero error counters. */
 		writel(0x8000, port + PORT_DECODE_ERR_THRESH);
···
 		writel(0x0000, port + PORT_CRC_ERR_CNT);
 		writel(0x0000, port + PORT_HSHK_ERR_CNT);
 
-		/* FIXME: 32bit activation? */
-		writel(0, port + PORT_ACTIVATE_UPPER_ADDR);
-		writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_STAT);
-
-		/* Configure interrupts */
-		writel(0xffff, port + PORT_IRQ_ENABLE_CLR);
-		writel(PORT_IRQ_COMPLETE | PORT_IRQ_ERROR | PORT_IRQ_SDB_FIS,
-		       port + PORT_IRQ_ENABLE_SET);
-
-		/* Clear interrupts */
-		writel(0x0fff0fff, port + PORT_IRQ_STAT);
-		writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
+		/* Always use 64bit activation */
+		writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_CLR);
 
 		/* Clear port multiplier enable and resume bits */
 		writel(PORT_CS_PM_EN | PORT_CS_RESUME, port + PORT_CTRL_CLR);
-
-		/* Reset itself */
-		if (__sil24_reset_controller(port))
-			dev_printk(KERN_ERR, &pdev->dev,
-			           "failed to reset controller\n");
 	}
 
 	/* Turn on interrupts */

drivers/scsi/sata_sis.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"sata_sis"
-#define DRV_VERSION	"0.5"
+#define DRV_VERSION	"0.6"
 
 enum {
 	sis_180			= 0,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.check_status		= ata_check_status,
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
-	.phy_reset		= sata_phy_reset,
 	.bmdma_setup            = ata_bmdma_setup,
 	.bmdma_start            = ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
-	.eng_timeout		= ata_eng_timeout,
+	.data_xfer		= ata_pio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
 	.scr_read		= sis_scr_read,
···
 
 static struct ata_port_info sis_port_info = {
 	.sht		= &sis_sht,
-	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
-			  ATA_FLAG_NO_LEGACY,
+	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
 	.pio_mask	= 0x1f,
 	.mwdma_mask	= 0x7,
 	.udma_mask	= 0x7f,

drivers/scsi/sata_svw.c

···
 #endif /* CONFIG_PPC_OF */
 
 #define DRV_NAME	"sata_svw"
-#define DRV_VERSION	"1.07"
+#define DRV_VERSION	"1.8"
 
 enum {
 	/* Taskfile registers offsets */
···
 	int len, index;
 
 	/* Find  the ata_port */
-	ap = (struct ata_port *) &shost->hostdata[0];
+	ap = ata_shost_to_port(shost);
 	if (ap == NULL)
 		return 0;
 
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 #ifdef CONFIG_PPC_OF
 	.proc_info		= k2_sata_proc_info,
 #endif
···
 	.check_status		= k2_stat_check_status,
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
-	.phy_reset		= sata_phy_reset,
 	.bmdma_setup		= k2_bmdma_setup_mmio,
 	.bmdma_start		= k2_bmdma_start_mmio,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
-	.eng_timeout		= ata_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
 	.scr_read		= k2_sata_scr_read,
···
 	writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
 
 	probe_ent->sht = &k2_sata_sht;
-	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
-				ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
+	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO;
 	probe_ent->port_ops = &k2_sata_ops;
 	probe_ent->n_ports = 4;
 	probe_ent->irq = pdev->irq;

drivers/scsi/sata_sx4.c

···
 #include "sata_promise.h"
 
 #define DRV_NAME	"sata_sx4"
-#define DRV_VERSION	"0.8"
+#define DRV_VERSION	"0.9"
 
 
 enum {
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.phy_reset		= pdc_20621_phy_reset,
 	.qc_prep		= pdc20621_qc_prep,
 	.qc_issue		= pdc20621_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
 	.eng_timeout		= pdc_eng_timeout,
 	.irq_handler		= pdc20621_interrupt,
 	.irq_clear		= pdc20621_irq_clear,
···
 		.sht		= &pdc_sata_sht,
 		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
 				  ATA_FLAG_SRST | ATA_FLAG_MMIO |
-				  ATA_FLAG_NO_ATAPI,
+				  ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING,
 		.pio_mask	= 0x1f, /* pio0-4 */
 		.mwdma_mask	= 0x07, /* mwdma0-2 */
 		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
···
 		tmp = mask & (1 << i);
 		VPRINTK("seq %u, port_no %u, ap %p, tmp %x\n", i, port_no, ap, tmp);
 		if (tmp && ap &&
-		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
 			struct ata_queued_cmd *qc;
 
 			qc = ata_qc_from_tag(ap, ap->active_tag);
-			if (qc && (!(qc->tf.ctl & ATA_NIEN)))
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 				handled += pdc20621_host_intr(ap, qc, (i > 4),
 							      mmio_base);
 		}
···
 	switch (qc->tf.protocol) {
 	case ATA_PROT_DMA:
 	case ATA_PROT_NODATA:
-		printk(KERN_ERR "ata%u: command timeout\n", ap->id);
+		ata_port_printk(ap, KERN_ERR, "command timeout\n");
 		qc->err_mask |= __ac_err_mask(ata_wait_idle(ap));
 		break;
 
 	default:
 		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
 
-		printk(KERN_ERR "ata%u: unknown timeout, cmd 0x%x stat 0x%x\n",
-		       ap->id, qc->tf.command, drv_stat);
+		ata_port_printk(ap, KERN_ERR,
+				"unknown timeout, cmd 0x%x stat 0x%x\n",
+				qc->tf.command, drv_stat);
 
 		qc->err_mask |= ac_err_mask(drv_stat);
 		break;
···
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
-	/*
-	 * If this driver happens to only be useful on Apple's K2, then
-	 * we should check that here as it has a normal Serverworks ID
-	 */
 	rc = pci_enable_device(pdev);
 	if (rc)
 		return rc;

drivers/scsi/sata_uli.c

···
 #include <linux/libata.h>
 
 #define DRV_NAME	"sata_uli"
-#define DRV_VERSION	"0.5"
+#define DRV_VERSION	"0.6"
 
 enum {
 	uli_5289		= 0,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
 
-	.phy_reset		= sata_phy_reset,
-
 	.bmdma_setup            = ata_bmdma_setup,
 	.bmdma_start            = ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
 
-	.eng_timeout		= ata_eng_timeout,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
···
 
 static struct ata_port_info uli_port_info = {
 	.sht            = &uli_sht,
-	.host_flags     = ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
-			  ATA_FLAG_NO_LEGACY,
+	.host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
 	.pio_mask       = 0x1f,		/* pio0-4 */
 	.udma_mask      = 0x7f,		/* udma0-6 */
 	.port_ops       = &uli_ops,

drivers/scsi/sata_via.c

···
 #include <asm/io.h>
 
 #define DRV_NAME	"sata_via"
-#define DRV_VERSION	"1.1"
+#define DRV_VERSION	"1.2"
 
 enum board_ids_enum {
 	vt6420,
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
 
-	.phy_reset		= sata_phy_reset,
-
 	.bmdma_setup            = ata_bmdma_setup,
 	.bmdma_start            = ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
···
 
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
 
-	.eng_timeout		= ata_eng_timeout,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.irq_handler		= ata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
···
 
 static struct ata_port_info svia_port_info = {
 	.sht		= &svia_sht,
-	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST | ATA_FLAG_NO_LEGACY,
+	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
 	.pio_mask	= 0x1f,
 	.mwdma_mask	= 0x07,
 	.udma_mask	= 0x7f,
···
 	INIT_LIST_HEAD(&probe_ent->node);
 
 	probe_ent->sht		= &svia_sht;
-	probe_ent->host_flags	= ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
-				  ATA_FLAG_NO_LEGACY;
+	probe_ent->host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY;
 	probe_ent->port_ops	= &svia_sata_ops;
 	probe_ent->n_ports	= N_PORTS;
 	probe_ent->irq		= pdev->irq;

drivers/scsi/sata_vsc.c

···
 
 			ap = host_set->ports[i];
 
-			if (ap && !(ap->flags &
-				    (ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
+			if (is_vsc_sata_int_err(i, int_status)) {
+				u32 err_status;
+				printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+				err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
+				vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+				handled++;
+			}
+
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
 				struct ata_queued_cmd *qc;
 
 				qc = ata_qc_from_tag(ap, ap->active_tag);
-				if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+				if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 					handled += ata_host_intr(ap, qc);
-				} else if (is_vsc_sata_int_err(i, int_status)) {
+				else if (is_vsc_sata_int_err(i, int_status)) {
 					/*
 					 * On some chips (i.e. Intel 31244), an error
 					 * interrupt will sneak in at initialization
···
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };
 
···
 	.exec_command		= ata_exec_command,
 	.check_status		= ata_check_status,
 	.dev_select		= ata_std_dev_select,
-	.phy_reset		= sata_phy_reset,
 	.bmdma_setup            = ata_bmdma_setup,
 	.bmdma_start            = ata_bmdma_start,
 	.bmdma_stop		= ata_bmdma_stop,
 	.bmdma_status		= ata_bmdma_status,
 	.qc_prep		= ata_qc_prep,
 	.qc_issue		= ata_qc_issue_prot,
-	.eng_timeout		= ata_eng_timeout,
+	.data_xfer		= ata_pio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 	.irq_handler		= vsc_sata_interrupt,
 	.irq_clear		= ata_bmdma_irq_clear,
 	.scr_read		= vsc_sata_scr_read,
···
 
 	probe_ent->sht = &vsc_sata_sht;
 	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				ATA_FLAG_MMIO | ATA_FLAG_SATA_RESET;
+				ATA_FLAG_MMIO;
 	probe_ent->port_ops = &vsc_sata_ops;
 	probe_ent->n_ports = 4;
 	probe_ent->irq = pdev->irq;

drivers/scsi/scsi.c

···
 static DEFINE_PER_CPU(struct list_head, scsi_done_q);
 
 /**
+ * scsi_req_abort_cmd -- Request command recovery for the specified command
+ * cmd: pointer to the SCSI command of interest
+ *
+ * This function requests that SCSI Core start recovery for the
+ * command by deleting the timer and adding the command to the eh
+ * queue.  It can be called by either LLDDs or SCSI Core.  LLDDs who
+ * implement their own error recovery MAY ignore the timeout event if
+ * they generated scsi_req_abort_cmd.
+ */
+void scsi_req_abort_cmd(struct scsi_cmnd *cmd)
+{
+	if (!scsi_delete_timer(cmd))
+		return;
+	scsi_times_out(cmd);
+}
+EXPORT_SYMBOL(scsi_req_abort_cmd);
+
+/**
  * scsi_done - Enqueue the finished SCSI command into the done queue.
  * @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
  * ownership back to SCSI Core -- i.e. the LLDD has finished with it.

drivers/scsi/scsi_error.c

···
 }
 
 /**
+ * scsi_schedule_eh - schedule EH for SCSI host
+ * @shost:	SCSI host to invoke error handling on.
+ *
+ * Schedule SCSI EH without scmd.
+ **/
+void scsi_schedule_eh(struct Scsi_Host *shost)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+
+	if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
+	    scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
+		shost->host_eh_scheduled++;
+		scsi_eh_wakeup(shost);
+	}
+
+	spin_unlock_irqrestore(shost->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(scsi_schedule_eh);
+
+/**
  * scsi_eh_scmd_add - add scsi cmd to error handling.
  * @scmd:	scmd to run eh on.
  * @eh_flag:	optional SCSI_EH flag.
···
 	 */
 	set_current_state(TASK_INTERRUPTIBLE);
 	while (!kthread_should_stop()) {
-		if (shost->host_failed == 0 ||
+		if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
 		    shost->host_failed != shost->host_busy) {
 			SCSI_LOG_ERROR_RECOVERY(1,
 				printk("Error handler scsi_eh_%d sleeping\n",

drivers/scsi/scsi_lib.c

···
 	spin_lock_irqsave(shost->host_lock, flags);
 	shost->host_busy--;
 	if (unlikely(scsi_host_in_recovery(shost) &&
-		     shost->host_failed))
+		     (shost->host_failed || shost->host_eh_scheduled)))
 		scsi_eh_wakeup(shost);
 	spin_unlock(shost->host_lock);
 	spin_lock(sdev->request_queue->queue_lock);

drivers/scsi/scsi_transport_api.h

···
+#ifndef _SCSI_TRANSPORT_API_H
+#define _SCSI_TRANSPORT_API_H
+
+void scsi_schedule_eh(struct Scsi_Host *shost);
+
+#endif /* _SCSI_TRANSPORT_API_H */

include/linux/ata.h

···
 	ATA_DRQ			= (1 << 3),	/* data request i/o */
 	ATA_ERR			= (1 << 0),	/* have an error */
 	ATA_SRST		= (1 << 2),	/* software reset */
+	ATA_ICRC		= (1 << 7),	/* interface CRC error */
+	ATA_UNC			= (1 << 6),	/* uncorrectable media error */
+	ATA_IDNF		= (1 << 4),	/* ID not found */
 	ATA_ABORTED		= (1 << 2),	/* command aborted */
 
 	/* ATA command block registers */
···
 	ATA_CMD_WRITE		= 0xCA,
 	ATA_CMD_WRITE_EXT	= 0x35,
 	ATA_CMD_WRITE_FUA_EXT	= 0x3D,
+	ATA_CMD_FPDMA_READ	= 0x60,
+	ATA_CMD_FPDMA_WRITE	= 0x61,
 	ATA_CMD_PIO_READ	= 0x20,
 	ATA_CMD_PIO_READ_EXT	= 0x24,
 	ATA_CMD_PIO_WRITE	= 0x30,
···
 	ATA_CMD_INIT_DEV_PARAMS	= 0x91,
 	ATA_CMD_READ_NATIVE_MAX	= 0xF8,
 	ATA_CMD_READ_NATIVE_MAX_EXT = 0x27,
+	ATA_CMD_READ_LOG_EXT	= 0x2f,
+
+	/* READ_LOG_EXT pages */
+	ATA_LOG_SATA_NCQ	= 0x10,
 
 	/* SETFEATURES stuff */
 	SETFEATURES_XFER	= 0x03,
···
 	XFER_PIO_0		= 0x08,
 	XFER_PIO_SLOW		= 0x00,
 
+	SETFEATURES_WC_ON	= 0x02, /* Enable write cache */
+	SETFEATURES_WC_OFF	= 0x82, /* Disable write cache */
+
 	/* ATAPI stuff */
 	ATAPI_PKT_DMA		= (1 << 0),
 	ATAPI_DMADIR		= (1 << 2),	/* ATAPI data dir:
···
 	SCR_ACTIVE		= 3,
 	SCR_NOTIFICATION	= 4,
 
+	/* SError bits */
+	SERR_DATA_RECOVERED	= (1 << 0), /* recovered data error */
+	SERR_COMM_RECOVERED	= (1 << 1), /* recovered comm failure */
+	SERR_DATA		= (1 << 8), /* unrecovered data error */
+	SERR_PERSISTENT		= (1 << 9), /* persistent data/comm error */
+	SERR_PROTOCOL		= (1 << 10), /* protocol violation */
+	SERR_INTERNAL		= (1 << 11), /* host internal error */
+	SERR_PHYRDY_CHG		= (1 << 16), /* PHY RDY changed */
+	SERR_DEV_XCHG		= (1 << 26), /* device exchanged */
+
 	/* struct ata_taskfile flags */
 	ATA_TFLAG_LBA48		= (1 << 0), /* enable 48-bit LBA and "HOB" */
 	ATA_TFLAG_ISADDR	= (1 << 1), /* enable r/w to nsect/lba regs */
···
 	ATA_TFLAG_WRITE		= (1 << 3), /* data dir: host->dev==1 (write) */
 	ATA_TFLAG_LBA		= (1 << 4), /* enable LBA */
 	ATA_TFLAG_FUA		= (1 << 5), /* enable FUA */
+	ATA_TFLAG_POLLING	= (1 << 6), /* set nIEN to 1 and use polling */
 };
 
 enum ata_tf_protocols {
···
 	ATA_PROT_NODATA,	/* no data */
 	ATA_PROT_PIO,		/* PIO single sector */
 	ATA_PROT_DMA,		/* DMA */
+	ATA_PROT_NCQ,		/* NCQ */
 	ATA_PROT_ATAPI,		/* packet command, PIO data xfer*/
 	ATA_PROT_ATAPI_NODATA,	/* packet command, no data */
 	ATA_PROT_ATAPI_DMA,	/* packet command with special DMA sauce */
···
 #define ata_id_has_pm(id)	((id)[82] & (1 << 3))
 #define ata_id_has_lba(id)	((id)[49] & (1 << 9))
 #define ata_id_has_dma(id)	((id)[49] & (1 << 8))
+#define ata_id_has_ncq(id)	((id)[76] & (1 << 8))
+#define ata_id_queue_depth(id)	(((id)[75] & 0x1f) + 1)
 #define ata_id_removeable(id)	((id)[0] & (1 << 7))
 #define ata_id_has_dword_io(id)	((id)[50] & (1 << 0))
 #define ata_id_u32(id,n)	\
···
 	  ((u64) (id)[(n) + 2] << 32) |	\
 	  ((u64) (id)[(n) + 1] << 16) |	\
 	  ((u64) (id)[(n) + 0]) )
+
+#define ata_id_cdb_intr(id)	(((id)[0] & 0x60) == 0x20)
 
 static inline unsigned int ata_id_major_version(const u16 *id)
 {
···
 	return (tf->protocol == ATA_PROT_ATAPI) ||
 	       (tf->protocol == ATA_PROT_ATAPI_NODATA) ||
 	       (tf->protocol == ATA_PROT_ATAPI_DMA);
+}
+
+static inline int is_multi_taskfile(struct ata_taskfile *tf)
+{
+	return (tf->command == ATA_CMD_READ_MULTI) ||
+	       (tf->command == ATA_CMD_WRITE_MULTI) ||
+	       (tf->command == ATA_CMD_READ_MULTI_EXT) ||
+	       (tf->command == ATA_CMD_WRITE_MULTI_EXT) ||
+	       (tf->command == ATA_CMD_WRITE_MULTI_FUA_EXT);
 }
 
 static inline int ata_ok(u8 status)

include/linux/libata.h

···
 #include <asm/io.h>
 #include <linux/ata.h>
 #include <linux/workqueue.h>
+#include <scsi/scsi_host.h>
 
 /*
  * compile-time options: to be removed as soon as all the drivers are
···
 #undef ATA_NDEBUG		/* define to disable quick runtime checks */
 #undef ATA_ENABLE_PATA		/* define to enable PATA support in some
 				 * low-level drivers */
-#undef ATAPI_ENABLE_DMADIR	/* enables ATAPI DMADIR bridge support */
 
 
 /* note: prints function name for you */
···
 	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
 	ATA_MAX_PORTS		= 8,
 	ATA_DEF_QUEUE		= 1,
-	ATA_MAX_QUEUE		= 1,
+	/* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
+	ATA_MAX_QUEUE		= 32,
+	ATA_TAG_INTERNAL	= ATA_MAX_QUEUE - 1,
 	ATA_MAX_SECTORS		= 200,	/* FIXME */
+	ATA_MAX_SECTORS_LBA48	= 65535,
 	ATA_MAX_BUS		= 2,
 	ATA_DEF_BUSY_WAIT	= 10000,
 	ATA_SHORT_PAUSE		= (HZ >> 6) + 1,
···
 	ATA_SHT_USE_CLUSTERING	= 1,
 
 	/* struct ata_device stuff */
-	ATA_DFLAG_LBA48		= (1 << 0), /* device supports LBA48 */
-	ATA_DFLAG_PIO		= (1 << 1), /* device currently in PIO mode */
-	ATA_DFLAG_LBA		= (1 << 2), /* device supports LBA */
+	ATA_DFLAG_LBA		= (1 << 0), /* device supports LBA */
+	ATA_DFLAG_LBA48		= (1 << 1), /* device supports LBA48 */
+	ATA_DFLAG_CDB_INTR	= (1 << 2), /* device asserts INTRQ when ready for CDB */
+	ATA_DFLAG_NCQ		= (1 << 3), /* device supports NCQ */
+	ATA_DFLAG_CFG_MASK	= (1 << 8) - 1,
+
+	ATA_DFLAG_PIO		= (1 << 8), /* device currently in PIO mode */
+	ATA_DFLAG_INIT_MASK	= (1 << 16) - 1,
+
+	ATA_DFLAG_DETACH	= (1 << 16),
+	ATA_DFLAG_DETACHED	= (1 << 17),
 
 	ATA_DEV_UNKNOWN		= 0,	/* unknown device */
 	ATA_DEV_ATA		= 1,	/* ATA device */
···
 	ATA_DEV_NONE		= 5,	/* no device */
 
 	/* struct ata_port flags */
-	ATA_FLAG_SLAVE_POSS	= (1 << 1), /* host supports slave dev */
+	ATA_FLAG_SLAVE_POSS	= (1 << 0), /* host supports slave dev */
 					    /* (doesn't imply presence) */
-	ATA_FLAG_PORT_DISABLED	= (1 << 2), /* port is disabled, ignore it */
-	ATA_FLAG_SATA		= (1 << 3),
-	ATA_FLAG_NO_LEGACY	= (1 << 4), /* no legacy mode check */
-	ATA_FLAG_SRST		= (1 << 5), /* (obsolete) use ATA SRST, not E.D.D. */
-	ATA_FLAG_MMIO		= (1 << 6), /* use MMIO, not PIO */
-	ATA_FLAG_SATA_RESET	= (1 << 7), /* (obsolete) use COMRESET */
-	ATA_FLAG_PIO_DMA	= (1 << 8), /* PIO cmds via DMA */
-	ATA_FLAG_NOINTR		= (1 << 9), /* FIXME: Remove this once
-					     * proper HSM is in place. */
-	ATA_FLAG_DEBUGMSG	= (1 << 10),
-	ATA_FLAG_NO_ATAPI	= (1 << 11), /* No ATAPI support */
+	ATA_FLAG_SATA		= (1 << 1),
+	ATA_FLAG_NO_LEGACY	= (1 << 2), /* no legacy mode check */
+	ATA_FLAG_MMIO		= (1 << 3), /* use MMIO, not PIO */
+	ATA_FLAG_SRST		= (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
+	ATA_FLAG_SATA_RESET	= (1 << 5), /* (obsolete) use COMRESET */
+	ATA_FLAG_NO_ATAPI	= (1 << 6), /* No ATAPI support */
+	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
+	ATA_FLAG_PIO_LBA48	= (1 << 8), /* Host DMA engine is LBA28 only */
+	ATA_FLAG_PIO_POLLING	= (1 << 9), /* use polling PIO if LLD
+					     * doesn't handle PIO interrupts */
+	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
+	ATA_FLAG_HRST_TO_RESUME	= (1 << 11), /* hardreset to resume phy */
+	ATA_FLAG_SKIP_D2H_BSY	= (1 << 12), /* can't wait for the first D2H
+					      * Register FIS clearing BSY */
 
-	ATA_FLAG_SUSPENDED	= (1 << 12), /* port is suspended */
+	ATA_FLAG_DEBUGMSG	= (1 << 13),
+	ATA_FLAG_FLUSH_PORT_TASK = (1 << 14), /* flush port task */
 
-	ATA_FLAG_PIO_LBA48	= (1 << 13), /* Host DMA engine is LBA28 only */
-	ATA_FLAG_IRQ_MASK	= (1 << 14), /* Mask IRQ in PIO xfers */
+	ATA_FLAG_EH_PENDING	= (1 << 15), /* EH pending */
+	ATA_FLAG_EH_IN_PROGRESS	= (1 << 16), /* EH in progress */
+	ATA_FLAG_FROZEN		= (1 << 17), /* port is frozen */
+	ATA_FLAG_RECOVERED	= (1 << 18), /* recovery action performed */
+	ATA_FLAG_LOADING	= (1 << 19), /* boot/loading probe */
+	ATA_FLAG_UNLOADING	= (1 << 20), /* module is unloading */
+	ATA_FLAG_SCSI_HOTPLUG	= (1 << 21), /* SCSI hotplug scheduled */
 
-	ATA_FLAG_FLUSH_PORT_TASK = (1 << 15), /* Flush port task */
-	ATA_FLAG_IN_EH		= (1 << 16), /* EH in progress */
+	ATA_FLAG_DISABLED	= (1 << 22), /* port is disabled, ignore it */
+	ATA_FLAG_SUSPENDED	= (1 << 23), /* port is suspended (power) */
 
-	ATA_QCFLAG_ACTIVE	= (1 << 1), /* cmd not yet ack'd to scsi lyer */
-	ATA_QCFLAG_SG		= (1 << 3), /* have s/g table? */
-	ATA_QCFLAG_SINGLE	= (1 << 4), /* no s/g, just a single buffer */
+	/* bits 24:31 of ap->flags are reserved for LLDD specific flags */
+
+	/* struct ata_queued_cmd flags */
+	ATA_QCFLAG_ACTIVE	= (1 << 0), /* cmd not yet ack'd to scsi lyer */
+	ATA_QCFLAG_SG		= (1 << 1), /* have s/g table? */
+	ATA_QCFLAG_SINGLE	= (1 << 2), /* no s/g, just a single buffer */
 	ATA_QCFLAG_DMAMAP	= ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
-	ATA_QCFLAG_EH_SCHEDULED = (1 << 5), /* EH scheduled */
+	ATA_QCFLAG_IO		= (1 << 3), /* standard IO command */
+	ATA_QCFLAG_RESULT_TF	= (1 << 4), /* result TF requested */
+
+	ATA_QCFLAG_FAILED	= (1 << 16), /* cmd failed and is owned by EH */
+	ATA_QCFLAG_SENSE_VALID	= (1 << 17), /* sense data valid */
+	ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */
 
 	/* host set flags */
 	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host_set only */
 	
 	/* various lengths of time */
-	ATA_TMOUT_PIO		= 30 * HZ,
 	ATA_TMOUT_BOOT		= 30 * HZ,	/* heuristic */
 	ATA_TMOUT_BOOT_QUICK	= 7 * HZ,	/* heuristic */
-	ATA_TMOUT_CDB		= 30 * HZ,
-	ATA_TMOUT_CDB_QUICK	= 5 * HZ,
 	ATA_TMOUT_INTERNAL	= 30 * HZ,
 	ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,
 
···
 	/* size of buffer to pad xfers ending on unaligned boundaries */
 	ATA_DMA_PAD_SZ		= 4,
 	ATA_DMA_PAD_BUF_SZ	= ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
-	
-	/* Masks for port functions */
+
+	/* masks for port functions */
 	ATA_PORT_PRIMARY	= (1 << 0),
 	ATA_PORT_SECONDARY	= (1 << 1),
+
+	/* ering size */
+	ATA_ERING_SIZE		= 32,
+
+	/* desc_len for ata_eh_info and context */
+	ATA_EH_DESC_LEN		= 80,
+
+	/* reset / recovery action types */
+	ATA_EH_REVALIDATE	= (1 << 0),
+	ATA_EH_SOFTRESET	= (1 << 1),
+	ATA_EH_HARDRESET	= (1 << 2),
+
+	ATA_EH_RESET_MASK	= ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
+	ATA_EH_PERDEV_MASK	= ATA_EH_REVALIDATE,
+
+	/* ata_eh_info->flags */
+	ATA_EHI_HOTPLUGGED	= (1 << 0),  /* could have been hotplugged */
+
+	ATA_EHI_DID_RESET	= (1 << 16), /* already reset this port */
+
+	/* max repeat if error condition is still set after ->error_handler */
+	ATA_EH_MAX_REPEAT	= 5,
+
+	/* how hard are we gonna try to probe/recover devices */
+	ATA_PROBE_MAX_TRIES	= 3,
+	ATA_EH_RESET_TRIES	= 3,
+	ATA_EH_DEV_TRIES	= 3,
+
+	/* Drive spinup time (time from power-on to the first D2H FIS)
+	 * in msecs - 8s currently.  Failing to get ready in this time
+	 * isn't critical.  It will result in reset failure for
+	 * controllers which can't wait for the first D2H FIS.  libata
+	 * will retry, so it just has to be long enough to spin up
+	 * most devices.
+	 */
+	ATA_SPINUP_WAIT		= 8000,
 };
 
 enum hsm_task_states {
-	HSM_ST_UNKNOWN,
-	HSM_ST_IDLE,
-	HSM_ST_POLL,
-	HSM_ST_TMOUT,
-	HSM_ST,
-	HSM_ST_LAST,
-	HSM_ST_LAST_POLL,
-	HSM_ST_ERR,
+	HSM_ST_UNKNOWN,		/* state unknown */
+	HSM_ST_IDLE,		/* no command on going */
+	HSM_ST,			/* (waiting the device to) transfer data */
+	HSM_ST_LAST,		/* (waiting the device to) complete command */
+	HSM_ST_ERR,		/* error */
+	HSM_ST_FIRST,		/* (waiting the device to)
+				   write CDB or first data block */
 };
 
 enum ata_completion_errors {
···
 
 /* typedefs */
 typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
-typedef void (*ata_probeinit_fn_t)(struct ata_port *);
-typedef int (*ata_reset_fn_t)(struct ata_port *, int, unsigned int *);
-typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *);
+typedef int (*ata_prereset_fn_t)(struct ata_port *ap);
+typedef int (*ata_reset_fn_t)(struct ata_port *ap, unsigned int *classes);
+typedef void (*ata_postreset_fn_t)(struct ata_port *ap, unsigned int *classes);
 
 struct ata_ioports {
 	unsigned long		cmd_addr;
···
 	unsigned long		flags;
 	int			simplex_claimed;	/* Keep seperate in case we
 							   ever need to do this locked */
-	struct ata_port *	ports[0];
+	struct ata_host_set	*next;		/* for legacy mode */
+	struct ata_port		*ports[0];
 };
 
 struct ata_queued_cmd {
···
 	struct scatterlist	*__sg;
 
 	unsigned int		err_mask;
-
+	struct ata_taskfile	result_tf;
 	ata_qc_cb_t		complete_fn;
 
 	void			*private_data;
···
 	unsigned long		rw_reqbuf;
 };
 
+struct ata_ering_entry {
+	int			is_io;
+	unsigned int		err_mask;
+	u64			timestamp;
+};
+
+struct ata_ering {
+	int			cursor;
+	struct ata_ering_entry	ring[ATA_ERING_SIZE];
+};
+
 struct ata_device {
-	u64			n_sectors;	/* size of device, if ATA */
-	unsigned long		flags;		/* ATA_DFLAG_xxx */
-	unsigned int		class;		/* ATA_DEV_xxx */
+	struct ata_port		*ap;
 	unsigned int		devno;		/* 0 or 1 */
-	u16			*id;		/* IDENTIFY xxx DEVICE data */
+	unsigned long		flags;		/* ATA_DFLAG_xxx */
+	struct scsi_device	*sdev;		/* attached SCSI device */
+	/* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
+	u64			n_sectors;	/* size of device, if ATA */
+	unsigned int		class;		/* ATA_DEV_xxx */
+	u16			id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
 	u8			pio_mode;
 	u8			dma_mode;
 	u8			xfer_mode;
···
 	u16			cylinders;	/* Number of cylinders */
 	u16			heads;		/* Number of heads */
 	u16			sectors;	/* Number of sectors per track */
+
+	/* error history */
+	struct ata_ering	ering;
+};
+
+/* Offset into struct ata_device.  Fields above it are maintained
+ * acress device init.  Fields below are zeroed.
+ */
+#define ATA_DEVICE_CLEAR_OFFSET		offsetof(struct ata_device, n_sectors)
+
+struct ata_eh_info {
+	struct ata_device	*dev;		/* offending device */
+	u32			serror;		/* SError from LLDD */
+	unsigned int		err_mask;	/* port-wide err_mask */
+	unsigned int		action;		/* ATA_EH_* action mask */
+	unsigned int		dev_action[ATA_MAX_DEVICES]; /* dev EH action */
+	unsigned int		flags;		/* ATA_EHI_* flags */
+
+	unsigned long		hotplug_timestamp;
+	unsigned int		probe_mask;
+
+	char			desc[ATA_EH_DESC_LEN];
+	int			desc_len;
+};
+
+struct ata_eh_context {
+	struct ata_eh_info	i;
+	int			tries[ATA_MAX_DEVICES];
+	unsigned int		classes[ATA_MAX_DEVICES];
+	unsigned int		did_probe_mask;
 };
 
 struct ata_port {
 	struct Scsi_Host	*host;	/* our co-allocated scsi host */
 	const struct ata_port_operations *ops;
+	spinlock_t		*lock;
 	unsigned long		flags;	/* ATA_FLAG_xxx */
 	unsigned int		id;	/* unique id req'd by scsi midlyr */
 	unsigned int		port_no; /* unique port #; from zero */
···
 	unsigned int		mwdma_mask;
 	unsigned int		udma_mask;
 	unsigned int		cbl;	/* cable type; ATA_CBL_xxx */
+	unsigned int		hw_sata_spd_limit;
+	unsigned int		sata_spd_limit;	/* SATA PHY speed limit */
+
+	/* record runtime error info, protected by host_set lock */
+	struct ata_eh_info	eh_info;
+	/* EH context owned by EH */
+	struct ata_eh_context	eh_context;
 
 	struct ata_device	device[ATA_MAX_DEVICES];
 
 	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
-	unsigned long		qactive;
+	unsigned long		qc_allocated;
+	unsigned int		qc_active;
+
 	unsigned int		active_tag;
+	u32			sactive;
 
 	struct ata_host_stats	stats;
 	struct ata_host_set	*host_set;
 	struct device 		*dev;
 
 	struct work_struct	port_task;
+	struct work_struct	hotplug_task;
+	struct work_struct	scsi_rescan_task;
 
 	unsigned int		hsm_task_state;
-	unsigned long		pio_task_timeout;
 
 	u32			msg_enable;
 	struct list_head	eh_done_q;
+	wait_queue_head_t	eh_wait_q;
 
 	void			*private_data;
+
+	u8			sector_buf[ATA_SECT_SIZE]; /* owned by EH */
 };
 
 struct ata_port_operations {
···
 
 	void (*phy_reset) (struct ata_port *ap); /* obsolete */
 	void (*set_mode) (struct ata_port *ap);
-	int (*probe_reset) (struct ata_port *ap, unsigned int *classes);
 
 	void (*post_set_mode) (struct ata_port *ap);
 
···
 	void (*bmdma_setup) (struct ata_queued_cmd *qc);
 	void (*bmdma_start) (struct ata_queued_cmd *qc);
 
+	void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
+
 	void (*qc_prep) (struct ata_queued_cmd *qc);
 	unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
 
-	void (*eng_timeout) (struct ata_port *ap);
+	/* Error handlers.  ->error_handler overrides ->eng_timeout and
+	 * indicates that new-style EH is in place.
+	 */
+	void (*eng_timeout) (struct ata_port *ap); /* obsolete */
+
+	void (*freeze) (struct ata_port *ap);
+	void (*thaw) (struct ata_port *ap);
+	void (*error_handler) (struct ata_port *ap);
+	void (*post_internal_cmd) (struct ata_queued_cmd *qc);
 
 	irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
 	void (*irq_clear) (struct ata_port *);
···
 
 #define FIT(v,vmin,vmax)	max_t(short,min_t(short,v,vmax),vmin)
 
+extern const unsigned long sata_deb_timing_boot[];
+extern const unsigned long sata_deb_timing_eh[];
+extern const unsigned long sata_deb_timing_before_fsrst[];
+
 extern void ata_port_probe(struct ata_port *);
 extern void __sata_phy_reset(struct ata_port *ap);
 extern void sata_phy_reset(struct ata_port *ap);
 extern void ata_bus_reset(struct ata_port *ap);
-extern int ata_drive_probe_reset(struct ata_port *ap,
-			ata_probeinit_fn_t probeinit,
-			ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
-			ata_postreset_fn_t postreset, unsigned int *classes);
-extern void ata_std_probeinit(struct ata_port *ap);
-extern int ata_std_softreset(struct ata_port *ap, int verbose,
-			     unsigned int *classes);
-extern int sata_std_hardreset(struct ata_port *ap, int verbose,
-			      unsigned int *class);
+extern int sata_set_spd(struct ata_port *ap);
+extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
+extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
+extern int ata_std_prereset(struct ata_port *ap);
+extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
+extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
 extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
-extern int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
-			      int post_reset);
+extern int ata_dev_revalidate(struct ata_device *dev, int post_reset);
 extern void ata_port_disable(struct ata_port *);
 extern void ata_std_ports(struct ata_ioports *ioaddr);
 #ifdef CONFIG_PCI
···
 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
 #endif /* CONFIG_PCI */
 extern int ata_device_add(const struct ata_probe_ent *ent);
+extern void ata_port_detach(struct ata_port *ap);
 extern void ata_host_set_remove(struct ata_host_set *host_set);
 extern int ata_scsi_detect(struct scsi_host_template *sht);
 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
-extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
-extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
 extern int ata_scsi_release(struct Scsi_Host *host);
 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
+extern int sata_scr_valid(struct ata_port *ap);
+extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
+extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
+extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
+extern int ata_port_online(struct ata_port *ap);
+extern int ata_port_offline(struct ata_port *ap);
 extern int ata_scsi_device_resume(struct scsi_device *);
 extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t state);
-extern int ata_device_resume(struct ata_port *, struct ata_device *);
-extern int ata_device_suspend(struct ata_port *, struct ata_device *, pm_message_t state);
+extern int ata_device_resume(struct ata_device *);
+extern int ata_device_suspend(struct ata_device *, pm_message_t state);
 extern int ata_ratelimit(void);
 extern unsigned int ata_busy_sleep(struct ata_port *ap,
 				   unsigned long timeout_pat,
 				   unsigned long timeout);
 extern void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *),
 				void *data, unsigned long delay);
+extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
+			     unsigned long interval_msec,
+			     unsigned long timeout_msec);
 
 /*
  * Default driver ops implementations
···
 extern u8 ata_check_status(struct ata_port *ap);
 extern u8 ata_altstatus(struct ata_port *ap);
 extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
-extern int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes);
 extern int ata_port_start (struct ata_port *ap);
 extern void ata_port_stop (struct ata_port *ap);
 extern void ata_host_stop (struct ata_host_set *host_set);
 extern irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
+extern void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
+			       unsigned int buflen, int write_data);
+extern void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
+			      unsigned int buflen, int write_data);
+extern void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
+			      unsigned int buflen, int write_data);
 extern void ata_qc_prep(struct ata_queued_cmd *qc);
 extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
 extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
···
 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
 extern u8   ata_bmdma_status(struct ata_port *ap);
 extern void ata_bmdma_irq_clear(struct ata_port *ap);
-extern void __ata_qc_complete(struct ata_queued_cmd *qc);
-extern void ata_eng_timeout(struct ata_port *ap);
-extern void ata_scsi_simulate(struct ata_port *ap, struct ata_device *dev,
-			      struct scsi_cmnd *cmd,
+extern void ata_bmdma_freeze(struct ata_port *ap);
+extern void ata_bmdma_thaw(struct ata_port *ap);
+extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+			       ata_reset_fn_t softreset,
+			       ata_reset_fn_t hardreset,
+			       ata_postreset_fn_t postreset);
+extern void ata_bmdma_error_handler(struct ata_port *ap);
+extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
+extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
+			u8 status, int in_wq);
+extern void ata_qc_complete(struct ata_queued_cmd *qc);
+extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
+				    void (*finish_qc)(struct ata_queued_cmd *));
+extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 			      void (*done)(struct scsi_cmnd *));
 extern int ata_std_bios_param(struct scsi_device *sdev,
 			      struct block_device *bdev,
 			      sector_t capacity, int geom[]);
 extern int ata_scsi_slave_config(struct scsi_device *sdev);
-extern struct ata_device *ata_dev_pair(struct ata_port *ap, 
-				       struct ata_device *adev);
+extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
+extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
+				       int queue_depth);
+extern struct ata_device *ata_dev_pair(struct ata_device *adev);
 
 /*
  * Timing helpers
···
 extern unsigned long ata_pci_default_filter(const struct ata_port *, struct ata_device *, unsigned long);
 #endif /* CONFIG_PCI */
 
+/*
+ * EH
+ */
+extern void ata_eng_timeout(struct ata_port *ap);
 
+extern void ata_port_schedule_eh(struct ata_port *ap);
+extern int ata_port_abort(struct ata_port *ap);
+extern int ata_port_freeze(struct ata_port *ap);
+
+extern void ata_eh_freeze_port(struct ata_port *ap);
+extern void ata_eh_thaw_port(struct ata_port *ap);
+
+extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
+extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
+
+extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+		      ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+		      ata_postreset_fn_t postreset);
+
+/*
+ * printk helpers
+ */
+#define ata_port_printk(ap, lv, fmt, args...) \
+	printk(lv"ata%u: "fmt, (ap)->id , ##args)
+
+#define ata_dev_printk(dev, lv, fmt, args...) \
+	printk(lv"ata%u.%02u: "fmt, (dev)->ap->id, (dev)->devno , ##args)
+
+/*
+ * ata_eh_info helpers
+ */
+#define ata_ehi_push_desc(ehi, fmt, args...) do { \
+	(ehi)->desc_len += scnprintf((ehi)->desc + (ehi)->desc_len, \
+				     ATA_EH_DESC_LEN - (ehi)->desc_len, \
+				     fmt , ##args); \
+} while (0)
+
+#define ata_ehi_clear_desc(ehi) do { \
+	(ehi)->desc[0] = '\0'; \
+	(ehi)->desc_len = 0; \
+} while (0)
+
+static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
+{
+	if (ehi->flags & ATA_EHI_HOTPLUGGED)
+		return;
+
+	ehi->flags |= ATA_EHI_HOTPLUGGED;
+	ehi->hotplug_timestamp = jiffies;
+
+	ehi->err_mask |= AC_ERR_ATA_BUS;
+	ehi->action |= ATA_EH_SOFTRESET;
+	ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+}
+
+/*
+ * qc helpers
+ */
 static inline int
 ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
 {
···
 	return (tag < ATA_MAX_QUEUE) ? 1 : 0;
 }
 
-static inline unsigned int ata_class_present(unsigned int class)
+static inline unsigned int ata_tag_internal(unsigned int tag)
+{
+	return tag == ATA_MAX_QUEUE - 1;
+}
+
+static inline unsigned int ata_class_enabled(unsigned int class)
 {
 	return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
 }
 
-static inline unsigned int ata_dev_present(const struct ata_device *dev)
+static inline unsigned int ata_class_disabled(unsigned int class)
 {
-	return ata_class_present(dev->class);
+	return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
+}
+
+static inline unsigned int ata_class_absent(unsigned int class)
+{
+	return !ata_class_enabled(class) && !ata_class_disabled(class);
+}
+
+static inline unsigned int ata_dev_enabled(const struct ata_device *dev)
+{
+	return ata_class_enabled(dev->class);
+}
+
+static inline unsigned int ata_dev_disabled(const struct ata_device *dev)
+{
+	return ata_class_disabled(dev->class);
+}
+
+static inline unsigned int ata_dev_absent(const struct ata_device *dev)
+{
+	return ata_class_absent(dev->class);
 }
 
 static inline u8 ata_chk_status(struct ata_port *ap)
···
 	qc->tf.ctl |= ATA_NIEN;
 }
 
-static inline struct ata_queued_cmd *ata_qc_from_tag (struct ata_port *ap,
-						      unsigned int tag)
+static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
+						       unsigned int tag)
 {
 	if (likely(ata_tag_valid(tag)))
 		return &ap->qcmd[tag];
 	return NULL;
 }
 
-static inline void ata_tf_init(struct ata_port *ap, struct ata_taskfile *tf, unsigned int device)
+static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
+						     unsigned int tag)
+{
+	struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+	if (unlikely(!qc) || !ap->ops->error_handler)
+		return qc;
+
+	if ((qc->flags & (ATA_QCFLAG_ACTIVE |
+			  ATA_QCFLAG_FAILED)) == ATA_QCFLAG_ACTIVE)
+		return qc;
+
+	return NULL;
+}
+
+static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
 {
 	memset(tf, 0, sizeof(*tf));
 
-	tf->ctl = ap->ctl;
-	if (device == 0)
+	tf->ctl = dev->ap->ctl;
+	if (dev->devno == 0)
 		tf->device = ATA_DEVICE_OBS;
 	else
 		tf->device = ATA_DEVICE_OBS | ATA_DEV1;
···
 	qc->nbytes = qc->curbytes = 0;
 	qc->err_mask = 0;
 
-	ata_tf_init(qc->ap, &qc->tf, qc->dev->devno);
-}
+	ata_tf_init(qc->dev, &qc->tf);
 
-/**
- *	ata_qc_complete - Complete an active ATA command
- *	@qc: Command to complete
- *	@err_mask: ATA Status register contents
- *
- *	Indicate to the mid and upper layers that an ATA
- *	command has completed, with either an ok or not-ok status.
- *
- *	LOCKING:
- *	spin_lock_irqsave(host_set lock)
- */
-static inline void ata_qc_complete(struct ata_queued_cmd *qc)
-{
-	if (unlikely(qc->flags & ATA_QCFLAG_EH_SCHEDULED))
-		return;
-
-	__ata_qc_complete(qc);
+	/* init result_tf such that it indicates normal completion */
+	qc->result_tf.command = ATA_DRDY;
+	qc->result_tf.feature = 0;
 }
 
 /**
···
 	return status;
 }
 
-static inline u32 scr_read(struct ata_port *ap, unsigned int reg)
-{
-	return ap->ops->scr_read(ap, reg);
-}
-
-static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val)
-{
-	ap->ops->scr_write(ap, reg, val);
-}
-
-static inline void scr_write_flush(struct ata_port *ap, unsigned int reg,
-				   u32 val)
-{
-	ap->ops->scr_write(ap, reg, val);
-	(void) ap->ops->scr_read(ap, reg);
-}
-
-static inline unsigned int sata_dev_present(struct ata_port *ap)
-{
-	return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;
-}
-
 static inline int ata_try_flush_cache(const struct ata_device *dev)
 {
 	return ata_id_wcache_enabled(dev->id) ||
···
 
 static inline unsigned int ac_err_mask(u8 status)
 {
-	if (status & ATA_BUSY)
+	if (status & (ATA_BUSY | ATA_DRQ))
 		return AC_ERR_HSM;
 	if (status & (ATA_ERR | ATA_DF))
 		return AC_ERR_DEV;
···
 static inline void ata_pad_free(struct ata_port *ap, struct device *dev)
 {
 	dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
+}
+
+static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host)
+{
+	return (struct ata_port *) &host->hostdata[0];
 }
 
 #endif /* __LINUX_LIBATA_H__ */

include/linux/pci_ids.h

···
 #define PCI_DEVICE_ID_NVIDIA_NVENET_15              0x0373
 #define PCI_DEVICE_ID_NVIDIA_NVENET_16              0x03E5
 #define PCI_DEVICE_ID_NVIDIA_NVENET_17              0x03E6
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA      0x03E7
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_IDE       0x03EC
 #define PCI_DEVICE_ID_NVIDIA_NVENET_18              0x03EE
 #define PCI_DEVICE_ID_NVIDIA_NVENET_19              0x03EF
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2     0x03F6
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3     0x03F7
 #define PCI_DEVICE_ID_NVIDIA_NVENET_20              0x0450
 #define PCI_DEVICE_ID_NVIDIA_NVENET_21              0x0451
 #define PCI_DEVICE_ID_NVIDIA_NVENET_22              0x0452
···
 #define PCI_DEVICE_ID_VIA_PX8X0_0	0x0259
 #define PCI_DEVICE_ID_VIA_3269_0	0x0269
 #define PCI_DEVICE_ID_VIA_K8T800PRO_0	0x0282
+#define PCI_DEVICE_ID_VIA_3296_0	0x0296
 #define PCI_DEVICE_ID_VIA_8363_0	0x0305
 #define PCI_DEVICE_ID_VIA_P4M800CE	0x0314
 #define PCI_DEVICE_ID_VIA_8371_0	0x0391
···
 #define PCI_DEVICE_ID_VIA_82C561	0x0561
 #define PCI_DEVICE_ID_VIA_82C586_1	0x0571
 #define PCI_DEVICE_ID_VIA_82C576	0x0576
+#define PCI_DEVICE_ID_VIA_SATA_EIDE	0x0581
 #define PCI_DEVICE_ID_VIA_82C586_0	0x0586
 #define PCI_DEVICE_ID_VIA_82C596	0x0596
 #define PCI_DEVICE_ID_VIA_82C597_0	0x0597
···
 #define PCI_DEVICE_ID_VIA_8783_0	0x3208
 #define PCI_DEVICE_ID_VIA_8237		0x3227
 #define PCI_DEVICE_ID_VIA_8251		0x3287
-#define PCI_DEVICE_ID_VIA_3296_0	0x0296
+#define PCI_DEVICE_ID_VIA_8237A		0x3337
 #define PCI_DEVICE_ID_VIA_8231		0x8231
 #define PCI_DEVICE_ID_VIA_8231_4	0x8235
 #define PCI_DEVICE_ID_VIA_8365_1	0x8305
+#define PCI_DEVICE_ID_VIA_CX700		0x8324
 #define PCI_DEVICE_ID_VIA_8371_1	0x8391
 #define PCI_DEVICE_ID_VIA_82C598_1	0x8598
 #define PCI_DEVICE_ID_VIA_838X_1	0xB188

include/scsi/scsi_cmnd.h

···
 extern void scsi_put_command(struct scsi_cmnd *);
 extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int);
 extern void scsi_finish_command(struct scsi_cmnd *cmd);
+extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);
 
 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
 				 size_t *offset, size_t *len);

include/scsi/scsi_host.h

···
 	 */
 	unsigned int host_busy;		   /* commands actually active on low-level */
 	unsigned int host_failed;	   /* commands that failed. */
+	unsigned int host_eh_scheduled;    /* EH scheduled without command */
     
 	unsigned short host_no;  /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
 	int resetting; /* if set, it means that last_reset is a valid value */