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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 | ||
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 | |
95897910 ON |
57 | * hibernate nearly identically. In all cases the requirements |
58 | * for runtime suspension are stricter. | |
28640516 | 59 | */ |
80d2fd48 AL |
60 | if (pm_runtime_suspended(dev)) |
61 | return 0; | |
28640516 | 62 | |
80d2fd48 | 63 | err = scsi_dev_type_suspend(dev, cb); |
28640516 | 64 | } |
80d2fd48 | 65 | |
db5bd1e0 AS |
66 | return err; |
67 | } | |
68 | ||
80d2fd48 AL |
69 | static int |
70 | scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) | |
db5bd1e0 AS |
71 | { |
72 | int err = 0; | |
73 | ||
9c31d8e1 | 74 | if (scsi_is_sdev_device(dev)) |
80d2fd48 | 75 | err = scsi_dev_type_resume(dev, cb); |
63347905 | 76 | |
bc4f2401 AS |
77 | if (err == 0) { |
78 | pm_runtime_disable(dev); | |
79 | pm_runtime_set_active(dev); | |
80 | pm_runtime_enable(dev); | |
81 | } | |
db5bd1e0 AS |
82 | return err; |
83 | } | |
84 | ||
fea6d607 AS |
85 | static int scsi_bus_prepare(struct device *dev) |
86 | { | |
87 | if (scsi_is_sdev_device(dev)) { | |
88 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
a7a20d10 | 89 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
fea6d607 AS |
90 | |
91 | } else if (scsi_is_host_device(dev)) { | |
92 | /* Wait until async scanning is finished */ | |
93 | scsi_complete_async_scans(); | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
db5bd1e0 AS |
98 | static int scsi_bus_suspend(struct device *dev) |
99 | { | |
80d2fd48 AL |
100 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
101 | return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); | |
102 | } | |
103 | ||
104 | static int scsi_bus_resume(struct device *dev) | |
105 | { | |
106 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
107 | return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); | |
db5bd1e0 AS |
108 | } |
109 | ||
110 | static int scsi_bus_freeze(struct device *dev) | |
111 | { | |
80d2fd48 AL |
112 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
113 | return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); | |
114 | } | |
115 | ||
116 | static int scsi_bus_thaw(struct device *dev) | |
117 | { | |
118 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
119 | return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); | |
db5bd1e0 AS |
120 | } |
121 | ||
122 | static int scsi_bus_poweroff(struct device *dev) | |
123 | { | |
80d2fd48 AL |
124 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
125 | return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); | |
126 | } | |
127 | ||
128 | static int scsi_bus_restore(struct device *dev) | |
129 | { | |
130 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
131 | return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); | |
db5bd1e0 AS |
132 | } |
133 | ||
134 | #else /* CONFIG_PM_SLEEP */ | |
135 | ||
fea6d607 | 136 | #define scsi_bus_prepare NULL |
db5bd1e0 | 137 | #define scsi_bus_suspend NULL |
80d2fd48 | 138 | #define scsi_bus_resume NULL |
db5bd1e0 | 139 | #define scsi_bus_freeze NULL |
80d2fd48 | 140 | #define scsi_bus_thaw NULL |
db5bd1e0 | 141 | #define scsi_bus_poweroff NULL |
80d2fd48 | 142 | #define scsi_bus_restore NULL |
db5bd1e0 AS |
143 | |
144 | #endif /* CONFIG_PM_SLEEP */ | |
145 | ||
bc4f2401 AS |
146 | #ifdef CONFIG_PM_RUNTIME |
147 | ||
6df339a5 LM |
148 | static int sdev_blk_runtime_suspend(struct scsi_device *sdev, |
149 | int (*cb)(struct device *)) | |
150 | { | |
151 | int err; | |
152 | ||
153 | err = blk_pre_runtime_suspend(sdev->request_queue); | |
154 | if (err) | |
155 | return err; | |
156 | if (cb) | |
157 | err = cb(&sdev->sdev_gendev); | |
158 | blk_post_runtime_suspend(sdev->request_queue, err); | |
159 | ||
160 | return err; | |
161 | } | |
162 | ||
163 | static int sdev_runtime_suspend(struct device *dev) | |
164 | { | |
165 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
166 | int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL; | |
167 | struct scsi_device *sdev = to_scsi_device(dev); | |
168 | int err; | |
169 | ||
170 | if (sdev->request_queue->dev) | |
171 | return sdev_blk_runtime_suspend(sdev, cb); | |
172 | ||
173 | err = scsi_dev_type_suspend(dev, cb); | |
174 | if (err == -EAGAIN) | |
175 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
176 | round_jiffies_up_relative(HZ/10))); | |
177 | return err; | |
178 | } | |
179 | ||
bc4f2401 AS |
180 | static int scsi_runtime_suspend(struct device *dev) |
181 | { | |
182 | int err = 0; | |
183 | ||
184 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
6df339a5 LM |
185 | if (scsi_is_sdev_device(dev)) |
186 | err = sdev_runtime_suspend(dev); | |
bc4f2401 AS |
187 | |
188 | /* Insert hooks here for targets, hosts, and transport classes */ | |
189 | ||
190 | return err; | |
191 | } | |
192 | ||
6df339a5 LM |
193 | static int sdev_blk_runtime_resume(struct scsi_device *sdev, |
194 | int (*cb)(struct device *)) | |
bc4f2401 AS |
195 | { |
196 | int err = 0; | |
6df339a5 LM |
197 | |
198 | blk_pre_runtime_resume(sdev->request_queue); | |
199 | if (cb) | |
200 | err = cb(&sdev->sdev_gendev); | |
201 | blk_post_runtime_resume(sdev->request_queue, err); | |
202 | ||
203 | return err; | |
204 | } | |
205 | ||
206 | static int sdev_runtime_resume(struct device *dev) | |
207 | { | |
208 | struct scsi_device *sdev = to_scsi_device(dev); | |
80d2fd48 | 209 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
6df339a5 LM |
210 | int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL; |
211 | ||
212 | if (sdev->request_queue->dev) | |
213 | return sdev_blk_runtime_resume(sdev, cb); | |
214 | else | |
215 | return scsi_dev_type_resume(dev, cb); | |
216 | } | |
217 | ||
218 | static int scsi_runtime_resume(struct device *dev) | |
219 | { | |
220 | int err = 0; | |
bc4f2401 AS |
221 | |
222 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
223 | if (scsi_is_sdev_device(dev)) | |
6df339a5 | 224 | err = sdev_runtime_resume(dev); |
bc4f2401 AS |
225 | |
226 | /* Insert hooks here for targets, hosts, and transport classes */ | |
227 | ||
228 | return err; | |
229 | } | |
230 | ||
231 | static int scsi_runtime_idle(struct device *dev) | |
232 | { | |
bc4f2401 AS |
233 | dev_dbg(dev, "scsi_runtime_idle\n"); |
234 | ||
235 | /* Insert hooks here for targets, hosts, and transport classes */ | |
236 | ||
6df339a5 LM |
237 | if (scsi_is_sdev_device(dev)) { |
238 | struct scsi_device *sdev = to_scsi_device(dev); | |
239 | ||
240 | if (sdev->request_queue->dev) { | |
241 | pm_runtime_mark_last_busy(dev); | |
45f0a85c RW |
242 | pm_runtime_autosuspend(dev); |
243 | return -EBUSY; | |
6df339a5 | 244 | } |
6df339a5 | 245 | } |
45f0a85c | 246 | return 0; |
bc4f2401 AS |
247 | } |
248 | ||
249 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
250 | { | |
251 | int err; | |
252 | ||
253 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 254 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 255 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 256 | else |
bc4f2401 AS |
257 | err = 0; |
258 | return err; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
261 | ||
262 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
263 | { | |
264 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
267 | ||
268 | void scsi_autopm_get_target(struct scsi_target *starget) | |
269 | { | |
270 | pm_runtime_get_sync(&starget->dev); | |
271 | } | |
272 | ||
273 | void scsi_autopm_put_target(struct scsi_target *starget) | |
274 | { | |
275 | pm_runtime_put_sync(&starget->dev); | |
276 | } | |
277 | ||
278 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
279 | { | |
280 | int err; | |
281 | ||
282 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 283 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 284 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 285 | else |
bc4f2401 AS |
286 | err = 0; |
287 | return err; | |
288 | } | |
289 | ||
290 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
291 | { | |
292 | pm_runtime_put_sync(&shost->shost_gendev); | |
293 | } | |
294 | ||
295 | #else | |
296 | ||
297 | #define scsi_runtime_suspend NULL | |
298 | #define scsi_runtime_resume NULL | |
299 | #define scsi_runtime_idle NULL | |
300 | ||
301 | #endif /* CONFIG_PM_RUNTIME */ | |
302 | ||
db5bd1e0 | 303 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 304 | .prepare = scsi_bus_prepare, |
db5bd1e0 | 305 | .suspend = scsi_bus_suspend, |
80d2fd48 | 306 | .resume = scsi_bus_resume, |
db5bd1e0 | 307 | .freeze = scsi_bus_freeze, |
80d2fd48 | 308 | .thaw = scsi_bus_thaw, |
db5bd1e0 | 309 | .poweroff = scsi_bus_poweroff, |
80d2fd48 | 310 | .restore = scsi_bus_restore, |
bc4f2401 AS |
311 | .runtime_suspend = scsi_runtime_suspend, |
312 | .runtime_resume = scsi_runtime_resume, | |
313 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 314 | }; |