tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/kernel.h>
2#include <linux/gfp.h>
3#include <linux/ide.h>
4
5int generic_ide_suspend(struct device *dev, pm_message_t mesg)
6{
7 ide_drive_t *drive = to_ide_device(dev);
8 ide_drive_t *pair = ide_get_pair_dev(drive);
9 ide_hwif_t *hwif = drive->hwif;
10 struct request *rq;
11 struct ide_pm_state rqpm;
12 int ret;
13
14 if (ide_port_acpi(hwif)) {
15 /* call ACPI _GTM only once */
16 if ((drive->dn & 1) == 0 || pair == NULL)
17 ide_acpi_get_timing(hwif);
18 }
19
20 memset(&rqpm, 0, sizeof(rqpm));
21 rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
22 rq->cmd_type = REQ_TYPE_ATA_PM_SUSPEND;
23 rq->special = &rqpm;
24 rqpm.pm_step = IDE_PM_START_SUSPEND;
25 if (mesg.event == PM_EVENT_PRETHAW)
26 mesg.event = PM_EVENT_FREEZE;
27 rqpm.pm_state = mesg.event;
28
29 ret = blk_execute_rq(drive->queue, NULL, rq, 0);
30 blk_put_request(rq);
31
32 if (ret == 0 && ide_port_acpi(hwif)) {
33 /* call ACPI _PS3 only after both devices are suspended */
34 if ((drive->dn & 1) || pair == NULL)
35 ide_acpi_set_state(hwif, 0);
36 }
37
38 return ret;
39}
40
41static void ide_end_sync_rq(struct request *rq, int error)
42{
43 complete(rq->end_io_data);
44}
45
46static int ide_pm_execute_rq(struct request *rq)
47{
48 struct request_queue *q = rq->q;
49 DECLARE_COMPLETION_ONSTACK(wait);
50
51 rq->end_io_data = &wait;
52 rq->end_io = ide_end_sync_rq;
53
54 spin_lock_irq(q->queue_lock);
55 if (unlikely(blk_queue_dying(q))) {
56 rq->cmd_flags |= REQ_QUIET;
57 rq->errors = -ENXIO;
58 __blk_end_request_all(rq, rq->errors);
59 spin_unlock_irq(q->queue_lock);
60 return -ENXIO;
61 }
62 __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
63 __blk_run_queue_uncond(q);
64 spin_unlock_irq(q->queue_lock);
65
66 wait_for_completion_io(&wait);
67
68 return rq->errors ? -EIO : 0;
69}
70
71int generic_ide_resume(struct device *dev)
72{
73 ide_drive_t *drive = to_ide_device(dev);
74 ide_drive_t *pair = ide_get_pair_dev(drive);
75 ide_hwif_t *hwif = drive->hwif;
76 struct request *rq;
77 struct ide_pm_state rqpm;
78 int err;
79
80 if (ide_port_acpi(hwif)) {
81 /* call ACPI _PS0 / _STM only once */
82 if ((drive->dn & 1) == 0 || pair == NULL) {
83 ide_acpi_set_state(hwif, 1);
84 ide_acpi_push_timing(hwif);
85 }
86
87 ide_acpi_exec_tfs(drive);
88 }
89
90 memset(&rqpm, 0, sizeof(rqpm));
91 rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
92 rq->cmd_type = REQ_TYPE_ATA_PM_RESUME;
93 rq->cmd_flags |= REQ_PREEMPT;
94 rq->special = &rqpm;
95 rqpm.pm_step = IDE_PM_START_RESUME;
96 rqpm.pm_state = PM_EVENT_ON;
97
98 err = ide_pm_execute_rq(rq);
99 blk_put_request(rq);
100
101 if (err == 0 && dev->driver) {
102 struct ide_driver *drv = to_ide_driver(dev->driver);
103
104 if (drv->resume)
105 drv->resume(drive);
106 }
107
108 return err;
109}
110
111void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
112{
113 struct ide_pm_state *pm = rq->special;
114
115#ifdef DEBUG_PM
116 printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
117 drive->name, pm->pm_step);
118#endif
119 if (drive->media != ide_disk)
120 return;
121
122 switch (pm->pm_step) {
123 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
124 if (pm->pm_state == PM_EVENT_FREEZE)
125 pm->pm_step = IDE_PM_COMPLETED;
126 else
127 pm->pm_step = IDE_PM_STANDBY;
128 break;
129 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
130 pm->pm_step = IDE_PM_COMPLETED;
131 break;
132 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
133 pm->pm_step = IDE_PM_IDLE;
134 break;
135 case IDE_PM_IDLE: /* Resume step 2 (idle)*/
136 pm->pm_step = IDE_PM_RESTORE_DMA;
137 break;
138 }
139}
140
141ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
142{
143 struct ide_pm_state *pm = rq->special;
144 struct ide_cmd cmd = { };
145
146 switch (pm->pm_step) {
147 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
148 if (drive->media != ide_disk)
149 break;
150 /* Not supported? Switch to next step now. */
151 if (ata_id_flush_enabled(drive->id) == 0 ||
152 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
153 ide_complete_power_step(drive, rq);
154 return ide_stopped;
155 }
156 if (ata_id_flush_ext_enabled(drive->id))
157 cmd.tf.command = ATA_CMD_FLUSH_EXT;
158 else
159 cmd.tf.command = ATA_CMD_FLUSH;
160 goto out_do_tf;
161 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
162 cmd.tf.command = ATA_CMD_STANDBYNOW1;
163 goto out_do_tf;
164 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
165 ide_set_max_pio(drive);
166 /*
167 * skip IDE_PM_IDLE for ATAPI devices
168 */
169 if (drive->media != ide_disk)
170 pm->pm_step = IDE_PM_RESTORE_DMA;
171 else
172 ide_complete_power_step(drive, rq);
173 return ide_stopped;
174 case IDE_PM_IDLE: /* Resume step 2 (idle) */
175 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
176 goto out_do_tf;
177 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
178 /*
179 * Right now, all we do is call ide_set_dma(drive),
180 * we could be smarter and check for current xfer_speed
181 * in struct drive etc...
182 */
183 if (drive->hwif->dma_ops == NULL)
184 break;
185 /*
186 * TODO: respect IDE_DFLAG_USING_DMA
187 */
188 ide_set_dma(drive);
189 break;
190 }
191
192 pm->pm_step = IDE_PM_COMPLETED;
193
194 return ide_stopped;
195
196out_do_tf:
197 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
198 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
199 cmd.protocol = ATA_PROT_NODATA;
200
201 return do_rw_taskfile(drive, &cmd);
202}
203
204/**
205 * ide_complete_pm_rq - end the current Power Management request
206 * @drive: target drive
207 * @rq: request
208 *
209 * This function cleans up the current PM request and stops the queue
210 * if necessary.
211 */
212void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
213{
214 struct request_queue *q = drive->queue;
215 struct ide_pm_state *pm = rq->special;
216 unsigned long flags;
217
218 ide_complete_power_step(drive, rq);
219 if (pm->pm_step != IDE_PM_COMPLETED)
220 return;
221
222#ifdef DEBUG_PM
223 printk("%s: completing PM request, %s\n", drive->name,
224 (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume");
225#endif
226 spin_lock_irqsave(q->queue_lock, flags);
227 if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND)
228 blk_stop_queue(q);
229 else
230 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
231 spin_unlock_irqrestore(q->queue_lock, flags);
232
233 drive->hwif->rq = NULL;
234
235 if (blk_end_request(rq, 0, 0))
236 BUG();
237}
238
239void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
240{
241 struct ide_pm_state *pm = rq->special;
242
243 if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND &&
244 pm->pm_step == IDE_PM_START_SUSPEND)
245 /* Mark drive blocked when starting the suspend sequence. */
246 drive->dev_flags |= IDE_DFLAG_BLOCKED;
247 else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME &&
248 pm->pm_step == IDE_PM_START_RESUME) {
249 /*
250 * The first thing we do on wakeup is to wait for BSY bit to
251 * go away (with a looong timeout) as a drive on this hwif may
252 * just be POSTing itself.
253 * We do that before even selecting as the "other" device on
254 * the bus may be broken enough to walk on our toes at this
255 * point.
256 */
257 ide_hwif_t *hwif = drive->hwif;
258 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
259 struct request_queue *q = drive->queue;
260 unsigned long flags;
261 int rc;
262#ifdef DEBUG_PM
263 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
264#endif
265 rc = ide_wait_not_busy(hwif, 35000);
266 if (rc)
267 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
268 tp_ops->dev_select(drive);
269 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
270 rc = ide_wait_not_busy(hwif, 100000);
271 if (rc)
272 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
273
274 spin_lock_irqsave(q->queue_lock, flags);
275 blk_start_queue(q);
276 spin_unlock_irqrestore(q->queue_lock, flags);
277 }
278}