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; | |
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 | ||
9c31d8e1 | 79 | if (scsi_is_sdev_device(dev)) |
db5bd1e0 | 80 | err = scsi_dev_type_resume(dev); |
63347905 | 81 | |
bc4f2401 AS |
82 | if (err == 0) { |
83 | pm_runtime_disable(dev); | |
84 | pm_runtime_set_active(dev); | |
85 | pm_runtime_enable(dev); | |
86 | } | |
db5bd1e0 AS |
87 | return err; |
88 | } | |
89 | ||
fea6d607 AS |
90 | static int scsi_bus_prepare(struct device *dev) |
91 | { | |
92 | if (scsi_is_sdev_device(dev)) { | |
93 | /* sd probing uses async_schedule. Wait until it finishes. */ | |
a7a20d10 | 94 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
fea6d607 AS |
95 | |
96 | } else if (scsi_is_host_device(dev)) { | |
97 | /* Wait until async scanning is finished */ | |
98 | scsi_complete_async_scans(); | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
db5bd1e0 AS |
103 | static int scsi_bus_suspend(struct device *dev) |
104 | { | |
105 | return scsi_bus_suspend_common(dev, PMSG_SUSPEND); | |
106 | } | |
107 | ||
108 | static int scsi_bus_freeze(struct device *dev) | |
109 | { | |
110 | return scsi_bus_suspend_common(dev, PMSG_FREEZE); | |
111 | } | |
112 | ||
113 | static int scsi_bus_poweroff(struct device *dev) | |
114 | { | |
115 | return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); | |
116 | } | |
117 | ||
118 | #else /* CONFIG_PM_SLEEP */ | |
119 | ||
120 | #define scsi_bus_resume_common NULL | |
fea6d607 | 121 | #define scsi_bus_prepare NULL |
db5bd1e0 AS |
122 | #define scsi_bus_suspend NULL |
123 | #define scsi_bus_freeze NULL | |
124 | #define scsi_bus_poweroff NULL | |
125 | ||
126 | #endif /* CONFIG_PM_SLEEP */ | |
127 | ||
bc4f2401 AS |
128 | #ifdef CONFIG_PM_RUNTIME |
129 | ||
130 | static int scsi_runtime_suspend(struct device *dev) | |
131 | { | |
132 | int err = 0; | |
133 | ||
134 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
135 | if (scsi_is_sdev_device(dev)) { | |
136 | err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); | |
137 | if (err == -EAGAIN) | |
138 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
139 | round_jiffies_up_relative(HZ/10))); | |
140 | } | |
141 | ||
142 | /* Insert hooks here for targets, hosts, and transport classes */ | |
143 | ||
144 | return err; | |
145 | } | |
146 | ||
147 | static int scsi_runtime_resume(struct device *dev) | |
148 | { | |
149 | int err = 0; | |
150 | ||
151 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
152 | if (scsi_is_sdev_device(dev)) | |
153 | err = scsi_dev_type_resume(dev); | |
154 | ||
155 | /* Insert hooks here for targets, hosts, and transport classes */ | |
156 | ||
157 | return err; | |
158 | } | |
159 | ||
160 | static int scsi_runtime_idle(struct device *dev) | |
161 | { | |
162 | int err; | |
163 | ||
164 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
165 | ||
166 | /* Insert hooks here for targets, hosts, and transport classes */ | |
167 | ||
168 | if (scsi_is_sdev_device(dev)) | |
169 | err = pm_schedule_suspend(dev, 100); | |
170 | else | |
171 | err = pm_runtime_suspend(dev); | |
172 | return err; | |
173 | } | |
174 | ||
175 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
176 | { | |
177 | int err; | |
178 | ||
179 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 180 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 181 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 182 | else |
bc4f2401 AS |
183 | err = 0; |
184 | return err; | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
187 | ||
188 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
189 | { | |
190 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
193 | ||
194 | void scsi_autopm_get_target(struct scsi_target *starget) | |
195 | { | |
196 | pm_runtime_get_sync(&starget->dev); | |
197 | } | |
198 | ||
199 | void scsi_autopm_put_target(struct scsi_target *starget) | |
200 | { | |
201 | pm_runtime_put_sync(&starget->dev); | |
202 | } | |
203 | ||
204 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
205 | { | |
206 | int err; | |
207 | ||
208 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 209 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 210 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 211 | else |
bc4f2401 AS |
212 | err = 0; |
213 | return err; | |
214 | } | |
215 | ||
216 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
217 | { | |
218 | pm_runtime_put_sync(&shost->shost_gendev); | |
219 | } | |
220 | ||
221 | #else | |
222 | ||
223 | #define scsi_runtime_suspend NULL | |
224 | #define scsi_runtime_resume NULL | |
225 | #define scsi_runtime_idle NULL | |
226 | ||
227 | #endif /* CONFIG_PM_RUNTIME */ | |
228 | ||
db5bd1e0 | 229 | const struct dev_pm_ops scsi_bus_pm_ops = { |
fea6d607 | 230 | .prepare = scsi_bus_prepare, |
db5bd1e0 AS |
231 | .suspend = scsi_bus_suspend, |
232 | .resume = scsi_bus_resume_common, | |
233 | .freeze = scsi_bus_freeze, | |
234 | .thaw = scsi_bus_resume_common, | |
235 | .poweroff = scsi_bus_poweroff, | |
236 | .restore = scsi_bus_resume_common, | |
bc4f2401 AS |
237 | .runtime_suspend = scsi_runtime_suspend, |
238 | .runtime_resume = scsi_runtime_resume, | |
239 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 240 | }; |