tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/gfp.h>
4#include <linux/ide.h>
5
6int generic_ide_suspend(struct device *dev, pm_message_t mesg)
7{
8 ide_drive_t *drive = to_ide_device(dev);
9 ide_drive_t *pair = ide_get_pair_dev(drive);
10 ide_hwif_t *hwif = drive->hwif;
11 struct request *rq;
12 struct ide_pm_state rqpm;
13 int ret;
14
15 if (ide_port_acpi(hwif)) {
16 /* call ACPI _GTM only once */
17 if ((drive->dn & 1) == 0 || pair == NULL)
18 ide_acpi_get_timing(hwif);
19 }
20
21 memset(&rqpm, 0, sizeof(rqpm));
22 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
23 ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
24 ide_req(rq)->special = &rqpm;
25 rqpm.pm_step = IDE_PM_START_SUSPEND;
26 if (mesg.event == PM_EVENT_PRETHAW)
27 mesg.event = PM_EVENT_FREEZE;
28 rqpm.pm_state = mesg.event;
29
30 blk_execute_rq(drive->queue, NULL, rq, 0);
31 ret = scsi_req(rq)->result ? -EIO : 0;
32 blk_put_request(rq);
33
34 if (ret == 0 && ide_port_acpi(hwif)) {
35 /* call ACPI _PS3 only after both devices are suspended */
36 if ((drive->dn & 1) || pair == NULL)
37 ide_acpi_set_state(hwif, 0);
38 }
39
40 return ret;
41}
42
43static int ide_pm_execute_rq(struct request *rq)
44{
45 struct request_queue *q = rq->q;
46
47 if (unlikely(blk_queue_dying(q))) {
48 rq->rq_flags |= RQF_QUIET;
49 scsi_req(rq)->result = -ENXIO;
50 blk_mq_end_request(rq, BLK_STS_OK);
51 return -ENXIO;
52 }
53 blk_execute_rq(q, NULL, rq, true);
54
55 return scsi_req(rq)->result ? -EIO : 0;
56}
57
58int generic_ide_resume(struct device *dev)
59{
60 ide_drive_t *drive = to_ide_device(dev);
61 ide_drive_t *pair = ide_get_pair_dev(drive);
62 ide_hwif_t *hwif = drive->hwif;
63 struct request *rq;
64 struct ide_pm_state rqpm;
65 int err;
66
67 blk_mq_start_stopped_hw_queues(drive->queue, true);
68
69 if (ide_port_acpi(hwif)) {
70 /* call ACPI _PS0 / _STM only once */
71 if ((drive->dn & 1) == 0 || pair == NULL) {
72 ide_acpi_set_state(hwif, 1);
73 ide_acpi_push_timing(hwif);
74 }
75
76 ide_acpi_exec_tfs(drive);
77 }
78
79 memset(&rqpm, 0, sizeof(rqpm));
80 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_PREEMPT);
81 ide_req(rq)->type = ATA_PRIV_PM_RESUME;
82 ide_req(rq)->special = &rqpm;
83 rqpm.pm_step = IDE_PM_START_RESUME;
84 rqpm.pm_state = PM_EVENT_ON;
85
86 err = ide_pm_execute_rq(rq);
87 blk_put_request(rq);
88
89 if (err == 0 && dev->driver) {
90 struct ide_driver *drv = to_ide_driver(dev->driver);
91
92 if (drv->resume)
93 drv->resume(drive);
94 }
95
96 return err;
97}
98
99void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
100{
101 struct ide_pm_state *pm = ide_req(rq)->special;
102
103#ifdef DEBUG_PM
104 printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
105 drive->name, pm->pm_step);
106#endif
107 if (drive->media != ide_disk)
108 return;
109
110 switch (pm->pm_step) {
111 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
112 if (pm->pm_state == PM_EVENT_FREEZE)
113 pm->pm_step = IDE_PM_COMPLETED;
114 else
115 pm->pm_step = IDE_PM_STANDBY;
116 break;
117 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
118 pm->pm_step = IDE_PM_COMPLETED;
119 break;
120 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
121 pm->pm_step = IDE_PM_IDLE;
122 break;
123 case IDE_PM_IDLE: /* Resume step 2 (idle)*/
124 pm->pm_step = IDE_PM_RESTORE_DMA;
125 break;
126 }
127}
128
129ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
130{
131 struct ide_pm_state *pm = ide_req(rq)->special;
132 struct ide_cmd cmd = { };
133
134 switch (pm->pm_step) {
135 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
136 if (drive->media != ide_disk)
137 break;
138 /* Not supported? Switch to next step now. */
139 if (ata_id_flush_enabled(drive->id) == 0 ||
140 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
141 ide_complete_power_step(drive, rq);
142 return ide_stopped;
143 }
144 if (ata_id_flush_ext_enabled(drive->id))
145 cmd.tf.command = ATA_CMD_FLUSH_EXT;
146 else
147 cmd.tf.command = ATA_CMD_FLUSH;
148 goto out_do_tf;
149 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
150 cmd.tf.command = ATA_CMD_STANDBYNOW1;
151 goto out_do_tf;
152 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
153 ide_set_max_pio(drive);
154 /*
155 * skip IDE_PM_IDLE for ATAPI devices
156 */
157 if (drive->media != ide_disk)
158 pm->pm_step = IDE_PM_RESTORE_DMA;
159 else
160 ide_complete_power_step(drive, rq);
161 return ide_stopped;
162 case IDE_PM_IDLE: /* Resume step 2 (idle) */
163 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
164 goto out_do_tf;
165 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
166 /*
167 * Right now, all we do is call ide_set_dma(drive),
168 * we could be smarter and check for current xfer_speed
169 * in struct drive etc...
170 */
171 if (drive->hwif->dma_ops == NULL)
172 break;
173 /*
174 * TODO: respect IDE_DFLAG_USING_DMA
175 */
176 ide_set_dma(drive);
177 break;
178 }
179
180 pm->pm_step = IDE_PM_COMPLETED;
181
182 return ide_stopped;
183
184out_do_tf:
185 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
186 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
187 cmd.protocol = ATA_PROT_NODATA;
188
189 return do_rw_taskfile(drive, &cmd);
190}
191
192/**
193 * ide_complete_pm_rq - end the current Power Management request
194 * @drive: target drive
195 * @rq: request
196 *
197 * This function cleans up the current PM request and stops the queue
198 * if necessary.
199 */
200void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
201{
202 struct request_queue *q = drive->queue;
203 struct ide_pm_state *pm = ide_req(rq)->special;
204
205 ide_complete_power_step(drive, rq);
206 if (pm->pm_step != IDE_PM_COMPLETED)
207 return;
208
209#ifdef DEBUG_PM
210 printk("%s: completing PM request, %s\n", drive->name,
211 (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
212#endif
213 if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
214 blk_mq_stop_hw_queues(q);
215 else
216 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
217
218 drive->hwif->rq = NULL;
219
220 blk_mq_end_request(rq, BLK_STS_OK);
221}
222
223void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
224{
225 struct ide_pm_state *pm = ide_req(rq)->special;
226
227 if (blk_rq_is_private(rq) &&
228 ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
229 pm->pm_step == IDE_PM_START_SUSPEND)
230 /* Mark drive blocked when starting the suspend sequence. */
231 drive->dev_flags |= IDE_DFLAG_BLOCKED;
232 else if (blk_rq_is_private(rq) &&
233 ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
234 pm->pm_step == IDE_PM_START_RESUME) {
235 /*
236 * The first thing we do on wakeup is to wait for BSY bit to
237 * go away (with a looong timeout) as a drive on this hwif may
238 * just be POSTing itself.
239 * We do that before even selecting as the "other" device on
240 * the bus may be broken enough to walk on our toes at this
241 * point.
242 */
243 ide_hwif_t *hwif = drive->hwif;
244 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
245 struct request_queue *q = drive->queue;
246 int rc;
247#ifdef DEBUG_PM
248 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
249#endif
250 rc = ide_wait_not_busy(hwif, 35000);
251 if (rc)
252 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
253 tp_ops->dev_select(drive);
254 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
255 rc = ide_wait_not_busy(hwif, 100000);
256 if (rc)
257 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
258
259 blk_mq_start_hw_queues(q);
260 }
261}