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 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 void ide_end_sync_rq(struct request *rq, blk_status_t error)
44{
45 complete(rq->end_io_data);
46}
47
48static int ide_pm_execute_rq(struct request *rq)
49{
50 struct request_queue *q = rq->q;
51 DECLARE_COMPLETION_ONSTACK(wait);
52
53 rq->end_io_data = &wait;
54 rq->end_io = ide_end_sync_rq;
55
56 spin_lock_irq(q->queue_lock);
57 if (unlikely(blk_queue_dying(q))) {
58 rq->rq_flags |= RQF_QUIET;
59 scsi_req(rq)->result = -ENXIO;
60 __blk_end_request_all(rq, BLK_STS_OK);
61 spin_unlock_irq(q->queue_lock);
62 return -ENXIO;
63 }
64 __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
65 __blk_run_queue_uncond(q);
66 spin_unlock_irq(q->queue_lock);
67
68 wait_for_completion_io(&wait);
69
70 return scsi_req(rq)->result ? -EIO : 0;
71}
72
73int generic_ide_resume(struct device *dev)
74{
75 ide_drive_t *drive = to_ide_device(dev);
76 ide_drive_t *pair = ide_get_pair_dev(drive);
77 ide_hwif_t *hwif = drive->hwif;
78 struct request *rq;
79 struct ide_pm_state rqpm;
80 int err;
81
82 if (ide_port_acpi(hwif)) {
83 /* call ACPI _PS0 / _STM only once */
84 if ((drive->dn & 1) == 0 || pair == NULL) {
85 ide_acpi_set_state(hwif, 1);
86 ide_acpi_push_timing(hwif);
87 }
88
89 ide_acpi_exec_tfs(drive);
90 }
91
92 memset(&rqpm, 0, sizeof(rqpm));
93 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_PREEMPT);
94 ide_req(rq)->type = ATA_PRIV_PM_RESUME;
95 rq->special = &rqpm;
96 rqpm.pm_step = IDE_PM_START_RESUME;
97 rqpm.pm_state = PM_EVENT_ON;
98
99 err = ide_pm_execute_rq(rq);
100 blk_put_request(rq);
101
102 if (err == 0 && dev->driver) {
103 struct ide_driver *drv = to_ide_driver(dev->driver);
104
105 if (drv->resume)
106 drv->resume(drive);
107 }
108
109 return err;
110}
111
112void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
113{
114 struct ide_pm_state *pm = rq->special;
115
116#ifdef DEBUG_PM
117 printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
118 drive->name, pm->pm_step);
119#endif
120 if (drive->media != ide_disk)
121 return;
122
123 switch (pm->pm_step) {
124 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
125 if (pm->pm_state == PM_EVENT_FREEZE)
126 pm->pm_step = IDE_PM_COMPLETED;
127 else
128 pm->pm_step = IDE_PM_STANDBY;
129 break;
130 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
131 pm->pm_step = IDE_PM_COMPLETED;
132 break;
133 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
134 pm->pm_step = IDE_PM_IDLE;
135 break;
136 case IDE_PM_IDLE: /* Resume step 2 (idle)*/
137 pm->pm_step = IDE_PM_RESTORE_DMA;
138 break;
139 }
140}
141
142ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
143{
144 struct ide_pm_state *pm = rq->special;
145 struct ide_cmd cmd = { };
146
147 switch (pm->pm_step) {
148 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
149 if (drive->media != ide_disk)
150 break;
151 /* Not supported? Switch to next step now. */
152 if (ata_id_flush_enabled(drive->id) == 0 ||
153 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
154 ide_complete_power_step(drive, rq);
155 return ide_stopped;
156 }
157 if (ata_id_flush_ext_enabled(drive->id))
158 cmd.tf.command = ATA_CMD_FLUSH_EXT;
159 else
160 cmd.tf.command = ATA_CMD_FLUSH;
161 goto out_do_tf;
162 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
163 cmd.tf.command = ATA_CMD_STANDBYNOW1;
164 goto out_do_tf;
165 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
166 ide_set_max_pio(drive);
167 /*
168 * skip IDE_PM_IDLE for ATAPI devices
169 */
170 if (drive->media != ide_disk)
171 pm->pm_step = IDE_PM_RESTORE_DMA;
172 else
173 ide_complete_power_step(drive, rq);
174 return ide_stopped;
175 case IDE_PM_IDLE: /* Resume step 2 (idle) */
176 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
177 goto out_do_tf;
178 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
179 /*
180 * Right now, all we do is call ide_set_dma(drive),
181 * we could be smarter and check for current xfer_speed
182 * in struct drive etc...
183 */
184 if (drive->hwif->dma_ops == NULL)
185 break;
186 /*
187 * TODO: respect IDE_DFLAG_USING_DMA
188 */
189 ide_set_dma(drive);
190 break;
191 }
192
193 pm->pm_step = IDE_PM_COMPLETED;
194
195 return ide_stopped;
196
197out_do_tf:
198 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
199 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
200 cmd.protocol = ATA_PROT_NODATA;
201
202 return do_rw_taskfile(drive, &cmd);
203}
204
205/**
206 * ide_complete_pm_rq - end the current Power Management request
207 * @drive: target drive
208 * @rq: request
209 *
210 * This function cleans up the current PM request and stops the queue
211 * if necessary.
212 */
213void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
214{
215 struct request_queue *q = drive->queue;
216 struct ide_pm_state *pm = rq->special;
217 unsigned long flags;
218
219 ide_complete_power_step(drive, rq);
220 if (pm->pm_step != IDE_PM_COMPLETED)
221 return;
222
223#ifdef DEBUG_PM
224 printk("%s: completing PM request, %s\n", drive->name,
225 (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
226#endif
227 spin_lock_irqsave(q->queue_lock, flags);
228 if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
229 blk_stop_queue(q);
230 else
231 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
232 spin_unlock_irqrestore(q->queue_lock, flags);
233
234 drive->hwif->rq = NULL;
235
236 if (blk_end_request(rq, BLK_STS_OK, 0))
237 BUG();
238}
239
240void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
241{
242 struct ide_pm_state *pm = rq->special;
243
244 if (blk_rq_is_private(rq) &&
245 ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
246 pm->pm_step == IDE_PM_START_SUSPEND)
247 /* Mark drive blocked when starting the suspend sequence. */
248 drive->dev_flags |= IDE_DFLAG_BLOCKED;
249 else if (blk_rq_is_private(rq) &&
250 ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
251 pm->pm_step == IDE_PM_START_RESUME) {
252 /*
253 * The first thing we do on wakeup is to wait for BSY bit to
254 * go away (with a looong timeout) as a drive on this hwif may
255 * just be POSTing itself.
256 * We do that before even selecting as the "other" device on
257 * the bus may be broken enough to walk on our toes at this
258 * point.
259 */
260 ide_hwif_t *hwif = drive->hwif;
261 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
262 struct request_queue *q = drive->queue;
263 unsigned long flags;
264 int rc;
265#ifdef DEBUG_PM
266 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
267#endif
268 rc = ide_wait_not_busy(hwif, 35000);
269 if (rc)
270 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
271 tp_ops->dev_select(drive);
272 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
273 rc = ide_wait_not_busy(hwif, 100000);
274 if (rc)
275 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
276
277 spin_lock_irqsave(q->queue_lock, flags);
278 blk_start_queue(q);
279 spin_unlock_irqrestore(q->queue_lock, flags);
280 }
281}