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Commit | Line | Data |
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db5bd1e0 AS |
1 | /* |
2 | * scsi_pm.c Copyright (C) 2010 Alan Stern | |
3 | * | |
4 | * SCSI dynamic Power Management | |
5 | * Initial version: Alan Stern <stern@rowland.harvard.edu> | |
6 | */ | |
7 | ||
8 | #include <linux/pm_runtime.h> | |
09703660 | 9 | #include <linux/export.h> |
fea6d607 | 10 | #include <linux/async.h> |
bca6b067 | 11 | #include <linux/blk-pm.h> |
db5bd1e0 AS |
12 | |
13 | #include <scsi/scsi.h> | |
14 | #include <scsi/scsi_device.h> | |
15 | #include <scsi/scsi_driver.h> | |
16 | #include <scsi/scsi_host.h> | |
17 | ||
18 | #include "scsi_priv.h" | |
19 | ||
6627b38f AL |
20 | #ifdef CONFIG_PM_SLEEP |
21 | ||
3c31b52f | 22 | static int do_scsi_suspend(struct device *dev, const struct dev_pm_ops *pm) |
db5bd1e0 | 23 | { |
3c31b52f DW |
24 | return pm && pm->suspend ? pm->suspend(dev) : 0; |
25 | } | |
26 | ||
27 | static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm) | |
28 | { | |
29 | return pm && pm->freeze ? pm->freeze(dev) : 0; | |
30 | } | |
31 | ||
32 | static int do_scsi_poweroff(struct device *dev, const struct dev_pm_ops *pm) | |
33 | { | |
34 | return pm && pm->poweroff ? pm->poweroff(dev) : 0; | |
35 | } | |
36 | ||
37 | static int do_scsi_resume(struct device *dev, const struct dev_pm_ops *pm) | |
38 | { | |
39 | return pm && pm->resume ? pm->resume(dev) : 0; | |
40 | } | |
41 | ||
42 | static int do_scsi_thaw(struct device *dev, const struct dev_pm_ops *pm) | |
43 | { | |
44 | return pm && pm->thaw ? pm->thaw(dev) : 0; | |
45 | } | |
46 | ||
47 | static int do_scsi_restore(struct device *dev, const struct dev_pm_ops *pm) | |
48 | { | |
49 | return pm && pm->restore ? pm->restore(dev) : 0; | |
50 | } | |
51 | ||
52 | static int scsi_dev_type_suspend(struct device *dev, | |
53 | int (*cb)(struct device *, const struct dev_pm_ops *)) | |
54 | { | |
55 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
db5bd1e0 AS |
56 | int err; |
57 | ||
3c31b52f DW |
58 | /* flush pending in-flight resume operations, suspend is synchronous */ |
59 | async_synchronize_full_domain(&scsi_sd_pm_domain); | |
60 | ||
db5bd1e0 AS |
61 | err = scsi_device_quiesce(to_scsi_device(dev)); |
62 | if (err == 0) { | |
3c31b52f DW |
63 | err = cb(dev, pm); |
64 | if (err) | |
65 | scsi_device_resume(to_scsi_device(dev)); | |
db5bd1e0 AS |
66 | } |
67 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
68 | return err; | |
69 | } | |
70 | ||
3c31b52f DW |
71 | static int scsi_dev_type_resume(struct device *dev, |
72 | int (*cb)(struct device *, const struct dev_pm_ops *)) | |
db5bd1e0 | 73 | { |
3c31b52f | 74 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
db5bd1e0 AS |
75 | int err = 0; |
76 | ||
3c31b52f | 77 | err = cb(dev, pm); |
db5bd1e0 AS |
78 | scsi_device_resume(to_scsi_device(dev)); |
79 | dev_dbg(dev, "scsi resume: %d\n", err); | |
3c31b52f DW |
80 | |
81 | if (err == 0) { | |
82 | pm_runtime_disable(dev); | |
3f7e62bb | 83 | err = pm_runtime_set_active(dev); |
3c31b52f | 84 | pm_runtime_enable(dev); |
3f7e62bb SC |
85 | |
86 | /* | |
87 | * Forcibly set runtime PM status of request queue to "active" | |
88 | * to make sure we can again get requests from the queue | |
89 | * (see also blk_pm_peek_request()). | |
90 | * | |
91 | * The resume hook will correct runtime PM status of the disk. | |
92 | */ | |
93 | if (!err && scsi_is_sdev_device(dev)) { | |
94 | struct scsi_device *sdev = to_scsi_device(dev); | |
95 | ||
96 | if (sdev->request_queue->dev) | |
97 | blk_set_runtime_active(sdev->request_queue); | |
98 | } | |
3c31b52f DW |
99 | } |
100 | ||
db5bd1e0 AS |
101 | return err; |
102 | } | |
103 | ||
80d2fd48 | 104 | static int |
3c31b52f DW |
105 | scsi_bus_suspend_common(struct device *dev, |
106 | int (*cb)(struct device *, const struct dev_pm_ops *)) | |
db5bd1e0 AS |
107 | { |
108 | int err = 0; | |
109 | ||
28640516 LM |
110 | if (scsi_is_sdev_device(dev)) { |
111 | /* | |
80d2fd48 AL |
112 | * All the high-level SCSI drivers that implement runtime |
113 | * PM treat runtime suspend, system suspend, and system | |
95897910 ON |
114 | * hibernate nearly identically. In all cases the requirements |
115 | * for runtime suspension are stricter. | |
28640516 | 116 | */ |
80d2fd48 AL |
117 | if (pm_runtime_suspended(dev)) |
118 | return 0; | |
28640516 | 119 | |
80d2fd48 | 120 | err = scsi_dev_type_suspend(dev, cb); |
28640516 | 121 | } |
80d2fd48 | 122 | |
db5bd1e0 AS |
123 | return err; |
124 | } | |
125 | ||
3c31b52f | 126 | static void async_sdev_resume(void *dev, async_cookie_t cookie) |
db5bd1e0 | 127 | { |
3c31b52f DW |
128 | scsi_dev_type_resume(dev, do_scsi_resume); |
129 | } | |
db5bd1e0 | 130 | |
3c31b52f DW |
131 | static void async_sdev_thaw(void *dev, async_cookie_t cookie) |
132 | { | |
133 | scsi_dev_type_resume(dev, do_scsi_thaw); | |
134 | } | |
63347905 | 135 | |
3c31b52f DW |
136 | static void async_sdev_restore(void *dev, async_cookie_t cookie) |
137 | { | |
138 | scsi_dev_type_resume(dev, do_scsi_restore); | |
139 | } | |
140 | ||
141 | static int scsi_bus_resume_common(struct device *dev, | |
142 | int (*cb)(struct device *, const struct dev_pm_ops *)) | |
143 | { | |
144 | async_func_t fn; | |
145 | ||
146 | if (!scsi_is_sdev_device(dev)) | |
147 | fn = NULL; | |
148 | else if (cb == do_scsi_resume) | |
149 | fn = async_sdev_resume; | |
150 | else if (cb == do_scsi_thaw) | |
151 | fn = async_sdev_thaw; | |
152 | else if (cb == do_scsi_restore) | |
153 | fn = async_sdev_restore; | |
154 | else | |
155 | fn = NULL; | |
156 | ||
157 | if (fn) { | |
158 | async_schedule_domain(fn, dev, &scsi_sd_pm_domain); | |
159 | ||
160 | /* | |
161 | * If a user has disabled async probing a likely reason | |
162 | * is due to a storage enclosure that does not inject | |
163 | * staggered spin-ups. For safety, make resume | |
164 | * synchronous as well in that case. | |
165 | */ | |
166 | if (strncmp(scsi_scan_type, "async", 5) != 0) | |
167 | async_synchronize_full_domain(&scsi_sd_pm_domain); | |
168 | } else { | |
bc4f2401 AS |
169 | pm_runtime_disable(dev); |
170 | pm_runtime_set_active(dev); | |
171 | pm_runtime_enable(dev); | |
172 | } | |
3c31b52f | 173 | return 0; |
db5bd1e0 AS |
174 | } |
175 | ||
fea6d607 AS |
176 | static int scsi_bus_prepare(struct device *dev) |
177 | { | |
178 | if (scsi_is_sdev_device(dev)) { | |
179 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
a7a20d10 | 180 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
fea6d607 AS |
181 | |
182 | } else if (scsi_is_host_device(dev)) { | |
183 | /* Wait until async scanning is finished */ | |
184 | scsi_complete_async_scans(); | |
185 | } | |
186 | return 0; | |
187 | } | |
188 | ||
db5bd1e0 AS |
189 | static int scsi_bus_suspend(struct device *dev) |
190 | { | |
3c31b52f | 191 | return scsi_bus_suspend_common(dev, do_scsi_suspend); |
80d2fd48 AL |
192 | } |
193 | ||
194 | static int scsi_bus_resume(struct device *dev) | |
195 | { | |
3c31b52f | 196 | return scsi_bus_resume_common(dev, do_scsi_resume); |
db5bd1e0 AS |
197 | } |
198 | ||
199 | static int scsi_bus_freeze(struct device *dev) | |
200 | { | |
3c31b52f | 201 | return scsi_bus_suspend_common(dev, do_scsi_freeze); |
80d2fd48 AL |
202 | } |
203 | ||
204 | static int scsi_bus_thaw(struct device *dev) | |
205 | { | |
3c31b52f | 206 | return scsi_bus_resume_common(dev, do_scsi_thaw); |
db5bd1e0 AS |
207 | } |
208 | ||
209 | static int scsi_bus_poweroff(struct device *dev) | |
210 | { | |
3c31b52f | 211 | return scsi_bus_suspend_common(dev, do_scsi_poweroff); |
80d2fd48 AL |
212 | } |
213 | ||
214 | static int scsi_bus_restore(struct device *dev) | |
215 | { | |
3c31b52f | 216 | return scsi_bus_resume_common(dev, do_scsi_restore); |
db5bd1e0 AS |
217 | } |
218 | ||
219 | #else /* CONFIG_PM_SLEEP */ | |
220 | ||
fea6d607 | 221 | #define scsi_bus_prepare NULL |
db5bd1e0 | 222 | #define scsi_bus_suspend NULL |
80d2fd48 | 223 | #define scsi_bus_resume NULL |
db5bd1e0 | 224 | #define scsi_bus_freeze NULL |
80d2fd48 | 225 | #define scsi_bus_thaw NULL |
db5bd1e0 | 226 | #define scsi_bus_poweroff NULL |
80d2fd48 | 227 | #define scsi_bus_restore NULL |
db5bd1e0 AS |
228 | |
229 | #endif /* CONFIG_PM_SLEEP */ | |
230 | ||
6627b38f | 231 | static int sdev_runtime_suspend(struct device *dev) |
6df339a5 | 232 | { |
6627b38f AL |
233 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
234 | struct scsi_device *sdev = to_scsi_device(dev); | |
49718f0f | 235 | int err = 0; |
6df339a5 | 236 | |
1c69d3b6 KX |
237 | err = blk_pre_runtime_suspend(sdev->request_queue); |
238 | if (err) | |
239 | return err; | |
240 | if (pm && pm->runtime_suspend) | |
6627b38f | 241 | err = pm->runtime_suspend(dev); |
1c69d3b6 KX |
242 | blk_post_runtime_suspend(sdev->request_queue, err); |
243 | ||
6df339a5 LM |
244 | return err; |
245 | } | |
246 | ||
bc4f2401 AS |
247 | static int scsi_runtime_suspend(struct device *dev) |
248 | { | |
249 | int err = 0; | |
250 | ||
251 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
6df339a5 LM |
252 | if (scsi_is_sdev_device(dev)) |
253 | err = sdev_runtime_suspend(dev); | |
bc4f2401 AS |
254 | |
255 | /* Insert hooks here for targets, hosts, and transport classes */ | |
256 | ||
257 | return err; | |
258 | } | |
259 | ||
6627b38f | 260 | static int sdev_runtime_resume(struct device *dev) |
bc4f2401 | 261 | { |
6627b38f AL |
262 | struct scsi_device *sdev = to_scsi_device(dev); |
263 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
bc4f2401 | 264 | int err = 0; |
6df339a5 | 265 | |
1c69d3b6 KX |
266 | blk_pre_runtime_resume(sdev->request_queue); |
267 | if (pm && pm->runtime_resume) | |
6627b38f | 268 | err = pm->runtime_resume(dev); |
1c69d3b6 KX |
269 | blk_post_runtime_resume(sdev->request_queue, err); |
270 | ||
6df339a5 LM |
271 | return err; |
272 | } | |
273 | ||
6df339a5 LM |
274 | static int scsi_runtime_resume(struct device *dev) |
275 | { | |
276 | int err = 0; | |
bc4f2401 AS |
277 | |
278 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
279 | if (scsi_is_sdev_device(dev)) | |
6df339a5 | 280 | err = sdev_runtime_resume(dev); |
bc4f2401 AS |
281 | |
282 | /* Insert hooks here for targets, hosts, and transport classes */ | |
283 | ||
284 | return err; | |
285 | } | |
286 | ||
287 | static int scsi_runtime_idle(struct device *dev) | |
288 | { | |
bc4f2401 AS |
289 | dev_dbg(dev, "scsi_runtime_idle\n"); |
290 | ||
291 | /* Insert hooks here for targets, hosts, and transport classes */ | |
292 | ||
6df339a5 | 293 | if (scsi_is_sdev_device(dev)) { |
6627b38f AL |
294 | pm_runtime_mark_last_busy(dev); |
295 | pm_runtime_autosuspend(dev); | |
296 | return -EBUSY; | |
6df339a5 | 297 | } |
6627b38f | 298 | |
45f0a85c | 299 | return 0; |
bc4f2401 AS |
300 | } |
301 | ||
302 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
303 | { | |
304 | int err; | |
305 | ||
306 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 307 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 308 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 309 | else |
bc4f2401 AS |
310 | err = 0; |
311 | return err; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
314 | ||
315 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
316 | { | |
317 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
320 | ||
321 | void scsi_autopm_get_target(struct scsi_target *starget) | |
322 | { | |
323 | pm_runtime_get_sync(&starget->dev); | |
324 | } | |
325 | ||
326 | void scsi_autopm_put_target(struct scsi_target *starget) | |
327 | { | |
328 | pm_runtime_put_sync(&starget->dev); | |
329 | } | |
330 | ||
331 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
332 | { | |
333 | int err; | |
334 | ||
335 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 336 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 337 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 338 | else |
bc4f2401 AS |
339 | err = 0; |
340 | return err; | |
341 | } | |
342 | ||
343 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
344 | { | |
345 | pm_runtime_put_sync(&shost->shost_gendev); | |
346 | } | |
347 | ||
db5bd1e0 | 348 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 349 | .prepare = scsi_bus_prepare, |
db5bd1e0 | 350 | .suspend = scsi_bus_suspend, |
80d2fd48 | 351 | .resume = scsi_bus_resume, |
db5bd1e0 | 352 | .freeze = scsi_bus_freeze, |
80d2fd48 | 353 | .thaw = scsi_bus_thaw, |
db5bd1e0 | 354 | .poweroff = scsi_bus_poweroff, |
80d2fd48 | 355 | .restore = scsi_bus_restore, |
bc4f2401 AS |
356 | .runtime_suspend = scsi_runtime_suspend, |
357 | .runtime_resume = scsi_runtime_resume, | |
358 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 359 | }; |