Commit | Line | Data |
---|---|---|
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 | ||
80d2fd48 | 19 | static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *)) |
db5bd1e0 | 20 | { |
db5bd1e0 AS |
21 | int err; |
22 | ||
23 | err = scsi_device_quiesce(to_scsi_device(dev)); | |
24 | if (err == 0) { | |
80d2fd48 AL |
25 | if (cb) { |
26 | err = cb(dev); | |
d20ec597 AL |
27 | if (err) |
28 | scsi_device_resume(to_scsi_device(dev)); | |
29 | } | |
db5bd1e0 AS |
30 | } |
31 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
32 | return err; | |
33 | } | |
34 | ||
80d2fd48 | 35 | static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *)) |
db5bd1e0 | 36 | { |
db5bd1e0 AS |
37 | int err = 0; |
38 | ||
80d2fd48 AL |
39 | if (cb) |
40 | err = cb(dev); | |
db5bd1e0 AS |
41 | scsi_device_resume(to_scsi_device(dev)); |
42 | dev_dbg(dev, "scsi resume: %d\n", err); | |
43 | return err; | |
44 | } | |
45 | ||
46 | #ifdef CONFIG_PM_SLEEP | |
47 | ||
80d2fd48 AL |
48 | static int |
49 | scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) | |
db5bd1e0 AS |
50 | { |
51 | int err = 0; | |
52 | ||
28640516 LM |
53 | if (scsi_is_sdev_device(dev)) { |
54 | /* | |
80d2fd48 AL |
55 | * All the high-level SCSI drivers that implement runtime |
56 | * PM treat runtime suspend, system suspend, and system | |
57 | * hibernate identically. | |
28640516 | 58 | */ |
80d2fd48 AL |
59 | if (pm_runtime_suspended(dev)) |
60 | return 0; | |
28640516 | 61 | |
80d2fd48 | 62 | err = scsi_dev_type_suspend(dev, cb); |
28640516 | 63 | } |
80d2fd48 | 64 | |
db5bd1e0 AS |
65 | return err; |
66 | } | |
67 | ||
80d2fd48 AL |
68 | static int |
69 | scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) | |
db5bd1e0 AS |
70 | { |
71 | int err = 0; | |
72 | ||
9c31d8e1 | 73 | if (scsi_is_sdev_device(dev)) |
80d2fd48 | 74 | err = scsi_dev_type_resume(dev, cb); |
63347905 | 75 | |
bc4f2401 AS |
76 | if (err == 0) { |
77 | pm_runtime_disable(dev); | |
78 | pm_runtime_set_active(dev); | |
79 | pm_runtime_enable(dev); | |
80 | } | |
db5bd1e0 AS |
81 | return err; |
82 | } | |
83 | ||
fea6d607 AS |
84 | static int scsi_bus_prepare(struct device *dev) |
85 | { | |
86 | if (scsi_is_sdev_device(dev)) { | |
87 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
a7a20d10 | 88 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
fea6d607 AS |
89 | |
90 | } else if (scsi_is_host_device(dev)) { | |
91 | /* Wait until async scanning is finished */ | |
92 | scsi_complete_async_scans(); | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
db5bd1e0 AS |
97 | static int scsi_bus_suspend(struct device *dev) |
98 | { | |
80d2fd48 AL |
99 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
100 | return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); | |
101 | } | |
102 | ||
103 | static int scsi_bus_resume(struct device *dev) | |
104 | { | |
105 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
106 | return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); | |
db5bd1e0 AS |
107 | } |
108 | ||
109 | static int scsi_bus_freeze(struct device *dev) | |
110 | { | |
80d2fd48 AL |
111 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
112 | return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); | |
113 | } | |
114 | ||
115 | static int scsi_bus_thaw(struct device *dev) | |
116 | { | |
117 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
118 | return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); | |
db5bd1e0 AS |
119 | } |
120 | ||
121 | static int scsi_bus_poweroff(struct device *dev) | |
122 | { | |
80d2fd48 AL |
123 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
124 | return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); | |
125 | } | |
126 | ||
127 | static int scsi_bus_restore(struct device *dev) | |
128 | { | |
129 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
130 | return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); | |
db5bd1e0 AS |
131 | } |
132 | ||
133 | #else /* CONFIG_PM_SLEEP */ | |
134 | ||
fea6d607 | 135 | #define scsi_bus_prepare NULL |
db5bd1e0 | 136 | #define scsi_bus_suspend NULL |
80d2fd48 | 137 | #define scsi_bus_resume NULL |
db5bd1e0 | 138 | #define scsi_bus_freeze NULL |
80d2fd48 | 139 | #define scsi_bus_thaw NULL |
db5bd1e0 | 140 | #define scsi_bus_poweroff NULL |
80d2fd48 | 141 | #define scsi_bus_restore NULL |
db5bd1e0 AS |
142 | |
143 | #endif /* CONFIG_PM_SLEEP */ | |
144 | ||
bc4f2401 AS |
145 | #ifdef CONFIG_PM_RUNTIME |
146 | ||
6df339a5 LM |
147 | static int sdev_blk_runtime_suspend(struct scsi_device *sdev, |
148 | int (*cb)(struct device *)) | |
149 | { | |
150 | int err; | |
151 | ||
152 | err = blk_pre_runtime_suspend(sdev->request_queue); | |
153 | if (err) | |
154 | return err; | |
155 | if (cb) | |
156 | err = cb(&sdev->sdev_gendev); | |
157 | blk_post_runtime_suspend(sdev->request_queue, err); | |
158 | ||
159 | return err; | |
160 | } | |
161 | ||
162 | static int sdev_runtime_suspend(struct device *dev) | |
163 | { | |
164 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
165 | int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL; | |
166 | struct scsi_device *sdev = to_scsi_device(dev); | |
167 | int err; | |
168 | ||
169 | if (sdev->request_queue->dev) | |
170 | return sdev_blk_runtime_suspend(sdev, cb); | |
171 | ||
172 | err = scsi_dev_type_suspend(dev, cb); | |
173 | if (err == -EAGAIN) | |
174 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
175 | round_jiffies_up_relative(HZ/10))); | |
176 | return err; | |
177 | } | |
178 | ||
bc4f2401 AS |
179 | static int scsi_runtime_suspend(struct device *dev) |
180 | { | |
181 | int err = 0; | |
182 | ||
183 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
6df339a5 LM |
184 | if (scsi_is_sdev_device(dev)) |
185 | err = sdev_runtime_suspend(dev); | |
bc4f2401 AS |
186 | |
187 | /* Insert hooks here for targets, hosts, and transport classes */ | |
188 | ||
189 | return err; | |
190 | } | |
191 | ||
6df339a5 LM |
192 | static int sdev_blk_runtime_resume(struct scsi_device *sdev, |
193 | int (*cb)(struct device *)) | |
bc4f2401 AS |
194 | { |
195 | int err = 0; | |
6df339a5 LM |
196 | |
197 | blk_pre_runtime_resume(sdev->request_queue); | |
198 | if (cb) | |
199 | err = cb(&sdev->sdev_gendev); | |
200 | blk_post_runtime_resume(sdev->request_queue, err); | |
201 | ||
202 | return err; | |
203 | } | |
204 | ||
205 | static int sdev_runtime_resume(struct device *dev) | |
206 | { | |
207 | struct scsi_device *sdev = to_scsi_device(dev); | |
80d2fd48 | 208 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
6df339a5 LM |
209 | int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL; |
210 | ||
211 | if (sdev->request_queue->dev) | |
212 | return sdev_blk_runtime_resume(sdev, cb); | |
213 | else | |
214 | return scsi_dev_type_resume(dev, cb); | |
215 | } | |
216 | ||
217 | static int scsi_runtime_resume(struct device *dev) | |
218 | { | |
219 | int err = 0; | |
bc4f2401 AS |
220 | |
221 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
222 | if (scsi_is_sdev_device(dev)) | |
6df339a5 | 223 | err = sdev_runtime_resume(dev); |
bc4f2401 AS |
224 | |
225 | /* Insert hooks here for targets, hosts, and transport classes */ | |
226 | ||
227 | return err; | |
228 | } | |
229 | ||
230 | static int scsi_runtime_idle(struct device *dev) | |
231 | { | |
232 | int err; | |
233 | ||
234 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
235 | ||
236 | /* Insert hooks here for targets, hosts, and transport classes */ | |
237 | ||
6df339a5 LM |
238 | if (scsi_is_sdev_device(dev)) { |
239 | struct scsi_device *sdev = to_scsi_device(dev); | |
240 | ||
241 | if (sdev->request_queue->dev) { | |
242 | pm_runtime_mark_last_busy(dev); | |
243 | err = pm_runtime_autosuspend(dev); | |
244 | } else { | |
245 | err = pm_runtime_suspend(dev); | |
246 | } | |
247 | } else { | |
bc4f2401 | 248 | err = pm_runtime_suspend(dev); |
6df339a5 | 249 | } |
bc4f2401 AS |
250 | return err; |
251 | } | |
252 | ||
253 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
254 | { | |
255 | int err; | |
256 | ||
257 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 258 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 259 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 260 | else |
bc4f2401 AS |
261 | err = 0; |
262 | return err; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
265 | ||
266 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
267 | { | |
268 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
271 | ||
272 | void scsi_autopm_get_target(struct scsi_target *starget) | |
273 | { | |
274 | pm_runtime_get_sync(&starget->dev); | |
275 | } | |
276 | ||
277 | void scsi_autopm_put_target(struct scsi_target *starget) | |
278 | { | |
279 | pm_runtime_put_sync(&starget->dev); | |
280 | } | |
281 | ||
282 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
283 | { | |
284 | int err; | |
285 | ||
286 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 287 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 288 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 289 | else |
bc4f2401 AS |
290 | err = 0; |
291 | return err; | |
292 | } | |
293 | ||
294 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
295 | { | |
296 | pm_runtime_put_sync(&shost->shost_gendev); | |
297 | } | |
298 | ||
299 | #else | |
300 | ||
301 | #define scsi_runtime_suspend NULL | |
302 | #define scsi_runtime_resume NULL | |
303 | #define scsi_runtime_idle NULL | |
304 | ||
305 | #endif /* CONFIG_PM_RUNTIME */ | |
306 | ||
db5bd1e0 | 307 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 308 | .prepare = scsi_bus_prepare, |
db5bd1e0 | 309 | .suspend = scsi_bus_suspend, |
80d2fd48 | 310 | .resume = scsi_bus_resume, |
db5bd1e0 | 311 | .freeze = scsi_bus_freeze, |
80d2fd48 | 312 | .thaw = scsi_bus_thaw, |
db5bd1e0 | 313 | .poweroff = scsi_bus_poweroff, |
80d2fd48 | 314 | .restore = scsi_bus_restore, |
bc4f2401 AS |
315 | .runtime_suspend = scsi_runtime_suspend, |
316 | .runtime_resume = scsi_runtime_resume, | |
317 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 318 | }; |