]>
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 | ||
19 | static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg) | |
20 | { | |
21 | struct device_driver *drv; | |
22 | int err; | |
23 | ||
24 | err = scsi_device_quiesce(to_scsi_device(dev)); | |
25 | if (err == 0) { | |
26 | drv = dev->driver; | |
d20ec597 | 27 | if (drv && drv->suspend) { |
db5bd1e0 | 28 | err = drv->suspend(dev, msg); |
d20ec597 AL |
29 | if (err) |
30 | scsi_device_resume(to_scsi_device(dev)); | |
31 | } | |
db5bd1e0 AS |
32 | } |
33 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
34 | return err; | |
35 | } | |
36 | ||
37 | static int scsi_dev_type_resume(struct device *dev) | |
38 | { | |
39 | struct device_driver *drv; | |
40 | int err = 0; | |
41 | ||
42 | drv = dev->driver; | |
43 | if (drv && drv->resume) | |
44 | err = drv->resume(dev); | |
45 | scsi_device_resume(to_scsi_device(dev)); | |
46 | dev_dbg(dev, "scsi resume: %d\n", err); | |
47 | return err; | |
48 | } | |
49 | ||
50 | #ifdef CONFIG_PM_SLEEP | |
51 | ||
52 | static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) | |
53 | { | |
54 | int err = 0; | |
55 | ||
28640516 LM |
56 | if (scsi_is_sdev_device(dev)) { |
57 | /* | |
58 | * sd is the only high-level SCSI driver to implement runtime | |
59 | * PM, and sd treats runtime suspend, system suspend, and | |
60 | * system hibernate identically (but not system freeze). | |
61 | */ | |
62 | if (pm_runtime_suspended(dev)) { | |
63 | if (msg.event == PM_EVENT_SUSPEND || | |
64 | msg.event == PM_EVENT_HIBERNATE) | |
65 | return 0; /* already suspended */ | |
66 | ||
67 | /* wake up device so that FREEZE will succeed */ | |
68 | pm_runtime_resume(dev); | |
69 | } | |
db5bd1e0 | 70 | err = scsi_dev_type_suspend(dev, msg); |
28640516 | 71 | } |
db5bd1e0 AS |
72 | return err; |
73 | } | |
74 | ||
75 | static int scsi_bus_resume_common(struct device *dev) | |
76 | { | |
77 | int err = 0; | |
78 | ||
33a2285d LM |
79 | /* |
80 | * Parent device may have runtime suspended as soon as | |
81 | * it is woken up during the system resume. | |
82 | * | |
83 | * Resume it on behalf of child. | |
84 | */ | |
85 | pm_runtime_get_sync(dev->parent); | |
86 | ||
87 | if (scsi_is_sdev_device(dev)) | |
db5bd1e0 | 88 | err = scsi_dev_type_resume(dev); |
bc4f2401 AS |
89 | if (err == 0) { |
90 | pm_runtime_disable(dev); | |
91 | pm_runtime_set_active(dev); | |
92 | pm_runtime_enable(dev); | |
93 | } | |
33a2285d LM |
94 | |
95 | pm_runtime_put_sync(dev->parent); | |
96 | ||
db5bd1e0 AS |
97 | return err; |
98 | } | |
99 | ||
fea6d607 AS |
100 | static int scsi_bus_prepare(struct device *dev) |
101 | { | |
102 | if (scsi_is_sdev_device(dev)) { | |
103 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
a7a20d10 | 104 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
fea6d607 AS |
105 | |
106 | } else if (scsi_is_host_device(dev)) { | |
107 | /* Wait until async scanning is finished */ | |
108 | scsi_complete_async_scans(); | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
db5bd1e0 AS |
113 | static int scsi_bus_suspend(struct device *dev) |
114 | { | |
115 | return scsi_bus_suspend_common(dev, PMSG_SUSPEND); | |
116 | } | |
117 | ||
118 | static int scsi_bus_freeze(struct device *dev) | |
119 | { | |
120 | return scsi_bus_suspend_common(dev, PMSG_FREEZE); | |
121 | } | |
122 | ||
123 | static int scsi_bus_poweroff(struct device *dev) | |
124 | { | |
125 | return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); | |
126 | } | |
127 | ||
128 | #else /* CONFIG_PM_SLEEP */ | |
129 | ||
130 | #define scsi_bus_resume_common NULL | |
fea6d607 | 131 | #define scsi_bus_prepare NULL |
db5bd1e0 AS |
132 | #define scsi_bus_suspend NULL |
133 | #define scsi_bus_freeze NULL | |
134 | #define scsi_bus_poweroff NULL | |
135 | ||
136 | #endif /* CONFIG_PM_SLEEP */ | |
137 | ||
bc4f2401 AS |
138 | #ifdef CONFIG_PM_RUNTIME |
139 | ||
140 | static int scsi_runtime_suspend(struct device *dev) | |
141 | { | |
142 | int err = 0; | |
143 | ||
144 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
145 | if (scsi_is_sdev_device(dev)) { | |
146 | err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); | |
147 | if (err == -EAGAIN) | |
148 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
149 | round_jiffies_up_relative(HZ/10))); | |
150 | } | |
151 | ||
152 | /* Insert hooks here for targets, hosts, and transport classes */ | |
153 | ||
154 | return err; | |
155 | } | |
156 | ||
157 | static int scsi_runtime_resume(struct device *dev) | |
158 | { | |
159 | int err = 0; | |
160 | ||
161 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
162 | if (scsi_is_sdev_device(dev)) | |
163 | err = scsi_dev_type_resume(dev); | |
164 | ||
165 | /* Insert hooks here for targets, hosts, and transport classes */ | |
166 | ||
167 | return err; | |
168 | } | |
169 | ||
170 | static int scsi_runtime_idle(struct device *dev) | |
171 | { | |
172 | int err; | |
173 | ||
174 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
175 | ||
176 | /* Insert hooks here for targets, hosts, and transport classes */ | |
177 | ||
178 | if (scsi_is_sdev_device(dev)) | |
179 | err = pm_schedule_suspend(dev, 100); | |
180 | else | |
181 | err = pm_runtime_suspend(dev); | |
182 | return err; | |
183 | } | |
184 | ||
185 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
186 | { | |
187 | int err; | |
188 | ||
189 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 190 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 191 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 192 | else |
bc4f2401 AS |
193 | err = 0; |
194 | return err; | |
195 | } | |
196 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
197 | ||
198 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
199 | { | |
200 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
203 | ||
204 | void scsi_autopm_get_target(struct scsi_target *starget) | |
205 | { | |
206 | pm_runtime_get_sync(&starget->dev); | |
207 | } | |
208 | ||
209 | void scsi_autopm_put_target(struct scsi_target *starget) | |
210 | { | |
211 | pm_runtime_put_sync(&starget->dev); | |
212 | } | |
213 | ||
214 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
215 | { | |
216 | int err; | |
217 | ||
218 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 219 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 220 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 221 | else |
bc4f2401 AS |
222 | err = 0; |
223 | return err; | |
224 | } | |
225 | ||
226 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
227 | { | |
228 | pm_runtime_put_sync(&shost->shost_gendev); | |
229 | } | |
230 | ||
231 | #else | |
232 | ||
233 | #define scsi_runtime_suspend NULL | |
234 | #define scsi_runtime_resume NULL | |
235 | #define scsi_runtime_idle NULL | |
236 | ||
237 | #endif /* CONFIG_PM_RUNTIME */ | |
238 | ||
db5bd1e0 | 239 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 240 | .prepare = scsi_bus_prepare, |
db5bd1e0 AS |
241 | .suspend = scsi_bus_suspend, |
242 | .resume = scsi_bus_resume_common, | |
243 | .freeze = scsi_bus_freeze, | |
244 | .thaw = scsi_bus_resume_common, | |
245 | .poweroff = scsi_bus_poweroff, | |
246 | .restore = scsi_bus_resume_common, | |
bc4f2401 AS |
247 | .runtime_suspend = scsi_runtime_suspend, |
248 | .runtime_resume = scsi_runtime_resume, | |
249 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 250 | }; |