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 | ||
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 | ||
147 | static int scsi_runtime_suspend(struct device *dev) | |
148 | { | |
149 | int err = 0; | |
80d2fd48 | 150 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bc4f2401 AS |
151 | |
152 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
153 | if (scsi_is_sdev_device(dev)) { | |
80d2fd48 AL |
154 | err = scsi_dev_type_suspend(dev, |
155 | pm ? pm->runtime_suspend : NULL); | |
bc4f2401 AS |
156 | if (err == -EAGAIN) |
157 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
158 | round_jiffies_up_relative(HZ/10))); | |
159 | } | |
160 | ||
161 | /* Insert hooks here for targets, hosts, and transport classes */ | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
166 | static int scsi_runtime_resume(struct device *dev) | |
167 | { | |
168 | int err = 0; | |
80d2fd48 | 169 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bc4f2401 AS |
170 | |
171 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
172 | if (scsi_is_sdev_device(dev)) | |
80d2fd48 | 173 | err = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL); |
bc4f2401 AS |
174 | |
175 | /* Insert hooks here for targets, hosts, and transport classes */ | |
176 | ||
177 | return err; | |
178 | } | |
179 | ||
180 | static int scsi_runtime_idle(struct device *dev) | |
181 | { | |
182 | int err; | |
183 | ||
184 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
185 | ||
186 | /* Insert hooks here for targets, hosts, and transport classes */ | |
187 | ||
188 | if (scsi_is_sdev_device(dev)) | |
189 | err = pm_schedule_suspend(dev, 100); | |
190 | else | |
191 | err = pm_runtime_suspend(dev); | |
192 | return err; | |
193 | } | |
194 | ||
195 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
196 | { | |
197 | int err; | |
198 | ||
199 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 200 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 201 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 202 | else |
bc4f2401 AS |
203 | err = 0; |
204 | return err; | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
207 | ||
208 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
209 | { | |
210 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
213 | ||
214 | void scsi_autopm_get_target(struct scsi_target *starget) | |
215 | { | |
216 | pm_runtime_get_sync(&starget->dev); | |
217 | } | |
218 | ||
219 | void scsi_autopm_put_target(struct scsi_target *starget) | |
220 | { | |
221 | pm_runtime_put_sync(&starget->dev); | |
222 | } | |
223 | ||
224 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
225 | { | |
226 | int err; | |
227 | ||
228 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 229 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 230 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 231 | else |
bc4f2401 AS |
232 | err = 0; |
233 | return err; | |
234 | } | |
235 | ||
236 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
237 | { | |
238 | pm_runtime_put_sync(&shost->shost_gendev); | |
239 | } | |
240 | ||
241 | #else | |
242 | ||
243 | #define scsi_runtime_suspend NULL | |
244 | #define scsi_runtime_resume NULL | |
245 | #define scsi_runtime_idle NULL | |
246 | ||
247 | #endif /* CONFIG_PM_RUNTIME */ | |
248 | ||
db5bd1e0 | 249 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 250 | .prepare = scsi_bus_prepare, |
db5bd1e0 | 251 | .suspend = scsi_bus_suspend, |
80d2fd48 | 252 | .resume = scsi_bus_resume, |
db5bd1e0 | 253 | .freeze = scsi_bus_freeze, |
80d2fd48 | 254 | .thaw = scsi_bus_thaw, |
db5bd1e0 | 255 | .poweroff = scsi_bus_poweroff, |
80d2fd48 | 256 | .restore = scsi_bus_restore, |
bc4f2401 AS |
257 | .runtime_suspend = scsi_runtime_suspend, |
258 | .runtime_resume = scsi_runtime_resume, | |
259 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 260 | }; |