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9#include <linux/pm_runtime.h>
10#include <linux/export.h>
11#include <linux/async.h>
12#include <linux/blk-pm.h>
13
14#include <scsi/scsi.h>
15#include <scsi/scsi_device.h>
16#include <scsi/scsi_driver.h>
17#include <scsi/scsi_host.h>
18
19#include "scsi_priv.h"
20
21#ifdef CONFIG_PM_SLEEP
22
23static int do_scsi_suspend(struct device *dev, const struct dev_pm_ops *pm)
24{
25 return pm && pm->suspend ? pm->suspend(dev) : 0;
26}
27
28static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm)
29{
30 return pm && pm->freeze ? pm->freeze(dev) : 0;
31}
32
33static int do_scsi_poweroff(struct device *dev, const struct dev_pm_ops *pm)
34{
35 return pm && pm->poweroff ? pm->poweroff(dev) : 0;
36}
37
38static int do_scsi_resume(struct device *dev, const struct dev_pm_ops *pm)
39{
40 return pm && pm->resume ? pm->resume(dev) : 0;
41}
42
43static int do_scsi_thaw(struct device *dev, const struct dev_pm_ops *pm)
44{
45 return pm && pm->thaw ? pm->thaw(dev) : 0;
46}
47
48static int do_scsi_restore(struct device *dev, const struct dev_pm_ops *pm)
49{
50 return pm && pm->restore ? pm->restore(dev) : 0;
51}
52
53static int scsi_dev_type_suspend(struct device *dev,
54 int (*cb)(struct device *, const struct dev_pm_ops *))
55{
56 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
57 int err;
58
59
60 async_synchronize_full_domain(&scsi_sd_pm_domain);
61
62 err = scsi_device_quiesce(to_scsi_device(dev));
63 if (err == 0) {
64 err = cb(dev, pm);
65 if (err)
66 scsi_device_resume(to_scsi_device(dev));
67 }
68 dev_dbg(dev, "scsi suspend: %d\n", err);
69 return err;
70}
71
72static int scsi_dev_type_resume(struct device *dev,
73 int (*cb)(struct device *, const struct dev_pm_ops *))
74{
75 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
76 int err = 0;
77
78 err = cb(dev, pm);
79 scsi_device_resume(to_scsi_device(dev));
80 dev_dbg(dev, "scsi resume: %d\n", err);
81
82 if (err == 0) {
83 pm_runtime_disable(dev);
84 err = pm_runtime_set_active(dev);
85 pm_runtime_enable(dev);
86
87
88
89
90
91
92
93
94 if (!err && scsi_is_sdev_device(dev)) {
95 struct scsi_device *sdev = to_scsi_device(dev);
96
97 if (sdev->request_queue->dev)
98 blk_set_runtime_active(sdev->request_queue);
99 }
100 }
101
102 return err;
103}
104
105static int
106scsi_bus_suspend_common(struct device *dev,
107 int (*cb)(struct device *, const struct dev_pm_ops *))
108{
109 int err = 0;
110
111 if (scsi_is_sdev_device(dev)) {
112
113
114
115
116
117
118 if (pm_runtime_suspended(dev))
119 return 0;
120
121 err = scsi_dev_type_suspend(dev, cb);
122 }
123
124 return err;
125}
126
127static void async_sdev_resume(void *dev, async_cookie_t cookie)
128{
129 scsi_dev_type_resume(dev, do_scsi_resume);
130}
131
132static void async_sdev_thaw(void *dev, async_cookie_t cookie)
133{
134 scsi_dev_type_resume(dev, do_scsi_thaw);
135}
136
137static void async_sdev_restore(void *dev, async_cookie_t cookie)
138{
139 scsi_dev_type_resume(dev, do_scsi_restore);
140}
141
142static int scsi_bus_resume_common(struct device *dev,
143 int (*cb)(struct device *, const struct dev_pm_ops *))
144{
145 async_func_t fn;
146
147 if (!scsi_is_sdev_device(dev))
148 fn = NULL;
149 else if (cb == do_scsi_resume)
150 fn = async_sdev_resume;
151 else if (cb == do_scsi_thaw)
152 fn = async_sdev_thaw;
153 else if (cb == do_scsi_restore)
154 fn = async_sdev_restore;
155 else
156 fn = NULL;
157
158 if (fn) {
159 async_schedule_domain(fn, dev, &scsi_sd_pm_domain);
160
161
162
163
164
165
166
167 if (strncmp(scsi_scan_type, "async", 5) != 0)
168 async_synchronize_full_domain(&scsi_sd_pm_domain);
169 } else {
170 pm_runtime_disable(dev);
171 pm_runtime_set_active(dev);
172 pm_runtime_enable(dev);
173 }
174 return 0;
175}
176
177static int scsi_bus_prepare(struct device *dev)
178{
179 if (scsi_is_host_device(dev)) {
180
181 scsi_complete_async_scans();
182 }
183 return 0;
184}
185
186static int scsi_bus_suspend(struct device *dev)
187{
188 return scsi_bus_suspend_common(dev, do_scsi_suspend);
189}
190
191static int scsi_bus_resume(struct device *dev)
192{
193 return scsi_bus_resume_common(dev, do_scsi_resume);
194}
195
196static int scsi_bus_freeze(struct device *dev)
197{
198 return scsi_bus_suspend_common(dev, do_scsi_freeze);
199}
200
201static int scsi_bus_thaw(struct device *dev)
202{
203 return scsi_bus_resume_common(dev, do_scsi_thaw);
204}
205
206static int scsi_bus_poweroff(struct device *dev)
207{
208 return scsi_bus_suspend_common(dev, do_scsi_poweroff);
209}
210
211static int scsi_bus_restore(struct device *dev)
212{
213 return scsi_bus_resume_common(dev, do_scsi_restore);
214}
215
216#else
217
218#define scsi_bus_prepare NULL
219#define scsi_bus_suspend NULL
220#define scsi_bus_resume NULL
221#define scsi_bus_freeze NULL
222#define scsi_bus_thaw NULL
223#define scsi_bus_poweroff NULL
224#define scsi_bus_restore NULL
225
226#endif
227
228static int sdev_runtime_suspend(struct device *dev)
229{
230 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
231 struct scsi_device *sdev = to_scsi_device(dev);
232 int err = 0;
233
234 err = blk_pre_runtime_suspend(sdev->request_queue);
235 if (err)
236 return err;
237 if (pm && pm->runtime_suspend)
238 err = pm->runtime_suspend(dev);
239 blk_post_runtime_suspend(sdev->request_queue, err);
240
241 return err;
242}
243
244static int scsi_runtime_suspend(struct device *dev)
245{
246 int err = 0;
247
248 dev_dbg(dev, "scsi_runtime_suspend\n");
249 if (scsi_is_sdev_device(dev))
250 err = sdev_runtime_suspend(dev);
251
252
253
254 return err;
255}
256
257static int sdev_runtime_resume(struct device *dev)
258{
259 struct scsi_device *sdev = to_scsi_device(dev);
260 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
261 int err = 0;
262
263 blk_pre_runtime_resume(sdev->request_queue);
264 if (pm && pm->runtime_resume)
265 err = pm->runtime_resume(dev);
266 blk_post_runtime_resume(sdev->request_queue, err);
267
268 return err;
269}
270
271static int scsi_runtime_resume(struct device *dev)
272{
273 int err = 0;
274
275 dev_dbg(dev, "scsi_runtime_resume\n");
276 if (scsi_is_sdev_device(dev))
277 err = sdev_runtime_resume(dev);
278
279
280
281 return err;
282}
283
284static int scsi_runtime_idle(struct device *dev)
285{
286 dev_dbg(dev, "scsi_runtime_idle\n");
287
288
289
290 if (scsi_is_sdev_device(dev)) {
291 pm_runtime_mark_last_busy(dev);
292 pm_runtime_autosuspend(dev);
293 return -EBUSY;
294 }
295
296 return 0;
297}
298
299int scsi_autopm_get_device(struct scsi_device *sdev)
300{
301 int err;
302
303 err = pm_runtime_get_sync(&sdev->sdev_gendev);
304 if (err < 0 && err !=-EACCES)
305 pm_runtime_put_sync(&sdev->sdev_gendev);
306 else
307 err = 0;
308 return err;
309}
310EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
311
312void scsi_autopm_put_device(struct scsi_device *sdev)
313{
314 pm_runtime_put_sync(&sdev->sdev_gendev);
315}
316EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
317
318void scsi_autopm_get_target(struct scsi_target *starget)
319{
320 pm_runtime_get_sync(&starget->dev);
321}
322
323void scsi_autopm_put_target(struct scsi_target *starget)
324{
325 pm_runtime_put_sync(&starget->dev);
326}
327
328int scsi_autopm_get_host(struct Scsi_Host *shost)
329{
330 int err;
331
332 err = pm_runtime_get_sync(&shost->shost_gendev);
333 if (err < 0 && err !=-EACCES)
334 pm_runtime_put_sync(&shost->shost_gendev);
335 else
336 err = 0;
337 return err;
338}
339
340void scsi_autopm_put_host(struct Scsi_Host *shost)
341{
342 pm_runtime_put_sync(&shost->shost_gendev);
343}
344
345const struct dev_pm_ops scsi_bus_pm_ops = {
346 .prepare = scsi_bus_prepare,
347 .suspend = scsi_bus_suspend,
348 .resume = scsi_bus_resume,
349 .freeze = scsi_bus_freeze,
350 .thaw = scsi_bus_thaw,
351 .poweroff = scsi_bus_poweroff,
352 .restore = scsi_bus_restore,
353 .runtime_suspend = scsi_runtime_suspend,
354 .runtime_resume = scsi_runtime_resume,
355 .runtime_idle = scsi_runtime_idle,
356};
357