rapidio: move net allocation into core code

Make net allocation/release routines available to all components of
RapidIO subsystem by moving code from rio-scan enumerator.

Make destination ID allocation method private to existing enumerator
because other enumeration methods can use their own algorithm.

Setup net device object as a parent of all RapidIO devices residing in
it and register net as a child of active mport device.

Signed-off-by: Alexandre Bounine <[e-mail]>
Cc: Matt Porter <[e-mail]>
Cc: Aurelien Jacquiot <[e-mail]>
Cc: Andre van Herk <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rapidio/rio-scan.c

···
 
 static void rio_init_em(struct rio_dev *rdev);
 
+struct rio_id_table {
+	u16 start;	/* logical minimal id */
+	u32 max;	/* max number of IDs in table */
+	spinlock_t lock;
+	unsigned long table[0];
+};
+
 static int next_destid = 0;
 static int next_comptag = 1;
 
···
 static u16 rio_destid_alloc(struct rio_net *net)
 {
 	int destid;
-	struct rio_id_table *idtab = &net->destid_table;
+	struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 
 	spin_lock(&idtab->lock);
 	destid = find_first_zero_bit(idtab->table, idtab->max);
···
 static int rio_destid_reserve(struct rio_net *net, u16 destid)
 {
 	int oldbit;
-	struct rio_id_table *idtab = &net->destid_table;
+	struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 
 	destid -= idtab->start;
 	spin_lock(&idtab->lock);
···
  */
 static void rio_destid_free(struct rio_net *net, u16 destid)
 {
-	struct rio_id_table *idtab = &net->destid_table;
+	struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 
 	destid -= idtab->start;
 	spin_lock(&idtab->lock);
···
 static u16 rio_destid_first(struct rio_net *net)
 {
 	int destid;
-	struct rio_id_table *idtab = &net->destid_table;
+	struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 
 	spin_lock(&idtab->lock);
 	destid = find_first_bit(idtab->table, idtab->max);
···
 static u16 rio_destid_next(struct rio_net *net, u16 from)
 {
 	int destid;
-	struct rio_id_table *idtab = &net->destid_table;
+	struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 
 	spin_lock(&idtab->lock);
 	destid = find_next_bit(idtab->table, idtab->max, from);
···
 			     rdev->comp_tag & RIO_CTAG_UDEVID);
 	}
 
-	rdev->dev.parent = &port->dev;
+	rdev->dev.parent = &net->dev;
 	rio_attach_device(rdev);
 	rdev->dev.release = rio_release_dev;
 	rdev->dma_mask = DMA_BIT_MASK(32);
···
 	return result & RIO_PORT_N_ERR_STS_PORT_OK;
 }
 
-/**
- * rio_alloc_net- Allocate and configure a new RIO network
- * @port: Master port associated with the RIO network
- * @do_enum: Enumeration/Discovery mode flag
- * @start: logical minimal start id for new net
- *
- * Allocates a RIO network structure, initializes per-network
- * list heads, and adds the associated master port to the
- * network list of associated master ports. Returns a
- * RIO network pointer on success or %NULL on failure.
- */
-static struct rio_net *rio_alloc_net(struct rio_mport *port,
-					       int do_enum, u16 start)
+static void rio_scan_release_net(struct rio_net *net)
+{
+	pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
+	kfree(net->enum_data);
+}
+
+static void rio_scan_release_dev(struct device *dev)
 {
 	struct rio_net *net;
 
-	net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
-	if (net && do_enum) {
-		net->destid_table.table = kcalloc(
-			BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
-			sizeof(long),
-			GFP_KERNEL);
+	net = to_rio_net(dev);
+	pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
+	kfree(net);
+}
 
-		if (net->destid_table.table == NULL) {
+/*
+ * rio_scan_alloc_net - Allocate and configure a new RIO network
+ * @mport: Master port associated with the RIO network
+ * @do_enum: Enumeration/Discovery mode flag
+ * @start: logical minimal start id for new net
+ *
+ * Allocates a new RIO network structure and initializes enumerator-specific
+ * part of it (if required).
+ * Returns a RIO network pointer on success or %NULL on failure.
+ */
+static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
+					  int do_enum, u16 start)
+{
+	struct rio_net *net;
+
+	net = rio_alloc_net(mport);
+
+	if (net && do_enum) {
+		struct rio_id_table *idtab;
+		size_t size;
+
+		size = sizeof(struct rio_id_table) +
+				BITS_TO_LONGS(
+					RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
+					) * sizeof(long);
+
+		idtab = kzalloc(size, GFP_KERNEL);
+
+		if (idtab == NULL) {
 			pr_err("RIO: failed to allocate destID table\n");
-			kfree(net);
+			rio_free_net(net);
 			net = NULL;
 		} else {
-			net->destid_table.start = start;
-			net->destid_table.max =
-					RIO_MAX_ROUTE_ENTRIES(port->sys_size);
-			spin_lock_init(&net->destid_table.lock);
+			net->enum_data = idtab;
+			net->release = rio_scan_release_net;
+			idtab->start = start;
+			idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
+			spin_lock_init(&idtab->lock);
 		}
 	}
 
 	if (net) {
-		INIT_LIST_HEAD(&net->node);
-		INIT_LIST_HEAD(&net->devices);
-		INIT_LIST_HEAD(&net->switches);
-		INIT_LIST_HEAD(&net->mports);
-		list_add_tail(&port->nnode, &net->mports);
-		net->hport = port;
-		net->id = port->id;
+		net->id = mport->id;
+		net->hport = mport;
+		dev_set_name(&net->dev, "rnet_%d", net->id);
+		net->dev.parent = &mport->dev;
+		net->dev.release = rio_scan_release_dev;
+		rio_add_net(net);
 	}
+
 	return net;
 }
 
···
 
 	/* If master port has an active link, allocate net and enum peers */
 	if (rio_mport_is_active(mport)) {
-		net = rio_alloc_net(mport, 1, 0);
+		net = rio_scan_alloc_net(mport, 1, 0);
 		if (!net) {
 			printk(KERN_ERR "RIO: failed to allocate new net\n");
 			rc = -ENOMEM;
···
 enum_done:
 		pr_debug("RIO: ... enumeration done\n");
 
-		net = rio_alloc_net(mport, 0, 0);
+		net = rio_scan_alloc_net(mport, 0, 0);
 		if (!net) {
 			printk(KERN_ERR "RIO: Failed to allocate new net\n");
 			goto bail;

drivers/rapidio/rio.c

···
 	"Destination ID assignment to local RapidIO controllers");
 
 static LIST_HEAD(rio_devices);
+static LIST_HEAD(rio_nets);
 static DEFINE_SPINLOCK(rio_global_list_lock);
 
 static LIST_HEAD(rio_mports);
···
 	return port->ops->query_mport(port, mport_attr);
 }
 EXPORT_SYMBOL(rio_query_mport);
+
+/**
+ * rio_alloc_net- Allocate and initialize a new RIO network data structure
+ * @mport: Master port associated with the RIO network
+ *
+ * Allocates a RIO network structure, initializes per-network
+ * list heads, and adds the associated master port to the
+ * network list of associated master ports. Returns a
+ * RIO network pointer on success or %NULL on failure.
+ */
+struct rio_net *rio_alloc_net(struct rio_mport *mport)
+{
+	struct rio_net *net;
+
+	net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
+	if (net) {
+		INIT_LIST_HEAD(&net->node);
+		INIT_LIST_HEAD(&net->devices);
+		INIT_LIST_HEAD(&net->switches);
+		INIT_LIST_HEAD(&net->mports);
+		mport->net = net;
+	}
+	return net;
+}
+EXPORT_SYMBOL_GPL(rio_alloc_net);
+
+int rio_add_net(struct rio_net *net)
+{
+	int err;
+
+	err = device_register(&net->dev);
+	if (err)
+		return err;
+	spin_lock(&rio_global_list_lock);
+	list_add_tail(&net->node, &rio_nets);
+	spin_unlock(&rio_global_list_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rio_add_net);
+
+void rio_free_net(struct rio_net *net)
+{
+	spin_lock(&rio_global_list_lock);
+	if (!list_empty(&net->node))
+		list_del(&net->node);
+	spin_unlock(&rio_global_list_lock);
+	if (net->release)
+		net->release(net);
+	device_unregister(&net->dev);
+}
+EXPORT_SYMBOL_GPL(rio_free_net);
 
 /**
  * rio_add_device- Adds a RIO device to the device model

drivers/rapidio/rio.h

···
 extern int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock);
 extern int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock);
 extern struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from);
+extern struct rio_net *rio_alloc_net(struct rio_mport *mport);
+extern int rio_add_net(struct rio_net *net);
+extern void rio_free_net(struct rio_net *net);
 extern int rio_add_device(struct rio_dev *rdev);
 extern void rio_del_device(struct rio_dev *rdev);
 extern int rio_enable_rx_tx_port(struct rio_mport *port, int local, u16 destid,

include/linux/rio.h

···
 #define	to_rio_dev(n) container_of(n, struct rio_dev, dev)
 #define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
 #define	to_rio_mport(n) container_of(n, struct rio_mport, dev)
+#define	to_rio_net(n) container_of(n, struct rio_net, dev)
 
 /**
  * struct rio_msg - RIO message event
···
  * @dbells: List of doorbell events
  * @node: Node in global list of master ports
  * @nnode: Node in network list of master ports
+ * @net: RIO net this mport is attached to
  * @iores: I/O mem resource that this master port interface owns
  * @riores: RIO resources that this master port interfaces owns
  * @inb_msg: RIO inbound message event descriptors
···
 	struct list_head dbells;	/* list of doorbell events */
 	struct list_head node;	/* node in global list of ports */
 	struct list_head nnode;	/* node in net list of ports */
+	struct rio_net *net;	/* RIO net this mport is attached to */
 	struct resource iores;
 	struct resource riores[RIO_MAX_MPORT_RESOURCES];
 	struct rio_msg inb_msg[RIO_MAX_MBOX];
···
  */
 #define RIO_SCAN_ENUM_NO_WAIT	0x00000001 /* Do not wait for enum completed */
 
-struct rio_id_table {
-	u16 start;	/* logical minimal id */
-	u32 max;	/* max number of IDs in table */
-	spinlock_t lock;
-	unsigned long *table;
-};
-
 /**
  * struct rio_net - RIO network info
  * @node: Node in global list of RIO networks
···
  * @mports: List of master ports accessing this network
  * @hport: Default port for accessing this network
  * @id: RIO network ID
- * @destid_table: destID allocation table
+ * @dev: Device object
+ * @enum_data: private data specific to a network enumerator
+ * @release: enumerator-specific release callback
  */
 struct rio_net {
 	struct list_head node;	/* node in list of networks */
···
 	struct list_head mports;	/* list of ports accessing net */
 	struct rio_mport *hport;	/* primary port for accessing net */
 	unsigned char id;	/* RIO network ID */
-	struct rio_id_table destid_table;  /* destID allocation table */
+	struct device dev;
+	void *enum_data;	/* private data for enumerator of the network */
+	void (*release)(struct rio_net *net);
 };
 
 enum rio_link_speed {