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