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 | ||
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; | |
27 | if (drv && drv->suspend) | |
28 | err = drv->suspend(dev, msg); | |
29 | } | |
30 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
31 | return err; | |
32 | } | |
33 | ||
34 | static int scsi_dev_type_resume(struct device *dev) | |
35 | { | |
36 | struct device_driver *drv; | |
37 | int err = 0; | |
38 | ||
39 | drv = dev->driver; | |
40 | if (drv && drv->resume) | |
41 | err = drv->resume(dev); | |
42 | scsi_device_resume(to_scsi_device(dev)); | |
43 | dev_dbg(dev, "scsi resume: %d\n", err); | |
44 | return err; | |
45 | } | |
46 | ||
47 | #ifdef CONFIG_PM_SLEEP | |
48 | ||
49 | static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) | |
50 | { | |
51 | int err = 0; | |
52 | ||
28640516 LM |
53 | if (scsi_is_sdev_device(dev)) { |
54 | /* | |
55 | * sd is the only high-level SCSI driver to implement runtime | |
56 | * PM, and sd treats runtime suspend, system suspend, and | |
57 | * system hibernate identically (but not system freeze). | |
58 | */ | |
59 | if (pm_runtime_suspended(dev)) { | |
60 | if (msg.event == PM_EVENT_SUSPEND || | |
61 | msg.event == PM_EVENT_HIBERNATE) | |
62 | return 0; /* already suspended */ | |
63 | ||
64 | /* wake up device so that FREEZE will succeed */ | |
65 | pm_runtime_resume(dev); | |
66 | } | |
db5bd1e0 | 67 | err = scsi_dev_type_suspend(dev, msg); |
28640516 | 68 | } |
db5bd1e0 AS |
69 | return err; |
70 | } | |
71 | ||
72 | static int scsi_bus_resume_common(struct device *dev) | |
73 | { | |
74 | int err = 0; | |
75 | ||
28fd00d4 LM |
76 | if (scsi_is_sdev_device(dev)) { |
77 | /* | |
78 | * Parent device may have runtime suspended as soon as | |
79 | * it is woken up during the system resume. | |
80 | * | |
81 | * Resume it on behalf of child. | |
82 | */ | |
83 | pm_runtime_get_sync(dev->parent); | |
db5bd1e0 | 84 | err = scsi_dev_type_resume(dev); |
28fd00d4 LM |
85 | pm_runtime_put_sync(dev->parent); |
86 | } | |
bc4f2401 AS |
87 | |
88 | if (err == 0) { | |
89 | pm_runtime_disable(dev); | |
90 | pm_runtime_set_active(dev); | |
91 | pm_runtime_enable(dev); | |
92 | } | |
db5bd1e0 AS |
93 | return err; |
94 | } | |
95 | ||
fea6d607 AS |
96 | static int scsi_bus_prepare(struct device *dev) |
97 | { | |
98 | if (scsi_is_sdev_device(dev)) { | |
99 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
100 | async_synchronize_full(); | |
101 | ||
102 | } else if (scsi_is_host_device(dev)) { | |
103 | /* Wait until async scanning is finished */ | |
104 | scsi_complete_async_scans(); | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
db5bd1e0 AS |
109 | static int scsi_bus_suspend(struct device *dev) |
110 | { | |
111 | return scsi_bus_suspend_common(dev, PMSG_SUSPEND); | |
112 | } | |
113 | ||
114 | static int scsi_bus_freeze(struct device *dev) | |
115 | { | |
116 | return scsi_bus_suspend_common(dev, PMSG_FREEZE); | |
117 | } | |
118 | ||
119 | static int scsi_bus_poweroff(struct device *dev) | |
120 | { | |
121 | return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); | |
122 | } | |
123 | ||
124 | #else /* CONFIG_PM_SLEEP */ | |
125 | ||
126 | #define scsi_bus_resume_common NULL | |
fea6d607 | 127 | #define scsi_bus_prepare NULL |
db5bd1e0 AS |
128 | #define scsi_bus_suspend NULL |
129 | #define scsi_bus_freeze NULL | |
130 | #define scsi_bus_poweroff NULL | |
131 | ||
132 | #endif /* CONFIG_PM_SLEEP */ | |
133 | ||
bc4f2401 AS |
134 | #ifdef CONFIG_PM_RUNTIME |
135 | ||
136 | static int scsi_runtime_suspend(struct device *dev) | |
137 | { | |
138 | int err = 0; | |
139 | ||
140 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
141 | if (scsi_is_sdev_device(dev)) { | |
142 | err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); | |
143 | if (err == -EAGAIN) | |
144 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
145 | round_jiffies_up_relative(HZ/10))); | |
146 | } | |
147 | ||
148 | /* Insert hooks here for targets, hosts, and transport classes */ | |
149 | ||
150 | return err; | |
151 | } | |
152 | ||
153 | static int scsi_runtime_resume(struct device *dev) | |
154 | { | |
155 | int err = 0; | |
156 | ||
157 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
158 | if (scsi_is_sdev_device(dev)) | |
159 | err = scsi_dev_type_resume(dev); | |
160 | ||
161 | /* Insert hooks here for targets, hosts, and transport classes */ | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
166 | static int scsi_runtime_idle(struct device *dev) | |
167 | { | |
168 | int err; | |
169 | ||
170 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
171 | ||
172 | /* Insert hooks here for targets, hosts, and transport classes */ | |
173 | ||
174 | if (scsi_is_sdev_device(dev)) | |
175 | err = pm_schedule_suspend(dev, 100); | |
176 | else | |
177 | err = pm_runtime_suspend(dev); | |
178 | return err; | |
179 | } | |
180 | ||
181 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
182 | { | |
183 | int err; | |
184 | ||
185 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 186 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 187 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 188 | else |
bc4f2401 AS |
189 | err = 0; |
190 | return err; | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
193 | ||
194 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
195 | { | |
196 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
197 | } | |
198 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
199 | ||
200 | void scsi_autopm_get_target(struct scsi_target *starget) | |
201 | { | |
202 | pm_runtime_get_sync(&starget->dev); | |
203 | } | |
204 | ||
205 | void scsi_autopm_put_target(struct scsi_target *starget) | |
206 | { | |
207 | pm_runtime_put_sync(&starget->dev); | |
208 | } | |
209 | ||
210 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
211 | { | |
212 | int err; | |
213 | ||
214 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 215 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 216 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 217 | else |
bc4f2401 AS |
218 | err = 0; |
219 | return err; | |
220 | } | |
221 | ||
222 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
223 | { | |
224 | pm_runtime_put_sync(&shost->shost_gendev); | |
225 | } | |
226 | ||
227 | #else | |
228 | ||
229 | #define scsi_runtime_suspend NULL | |
230 | #define scsi_runtime_resume NULL | |
231 | #define scsi_runtime_idle NULL | |
232 | ||
233 | #endif /* CONFIG_PM_RUNTIME */ | |
234 | ||
db5bd1e0 | 235 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 236 | .prepare = scsi_bus_prepare, |
db5bd1e0 AS |
237 | .suspend = scsi_bus_suspend, |
238 | .resume = scsi_bus_resume_common, | |
239 | .freeze = scsi_bus_freeze, | |
240 | .thaw = scsi_bus_resume_common, | |
241 | .poweroff = scsi_bus_poweroff, | |
242 | .restore = scsi_bus_resume_common, | |
bc4f2401 AS |
243 | .runtime_suspend = scsi_runtime_suspend, |
244 | .runtime_resume = scsi_runtime_resume, | |
245 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 246 | }; |