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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> |
db5bd1e0 AS |
10 | |
11 | #include <scsi/scsi.h> | |
12 | #include <scsi/scsi_device.h> | |
13 | #include <scsi/scsi_driver.h> | |
14 | #include <scsi/scsi_host.h> | |
15 | ||
16 | #include "scsi_priv.h" | |
17 | ||
18 | static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg) | |
19 | { | |
20 | struct device_driver *drv; | |
21 | int err; | |
22 | ||
23 | err = scsi_device_quiesce(to_scsi_device(dev)); | |
24 | if (err == 0) { | |
25 | drv = dev->driver; | |
26 | if (drv && drv->suspend) | |
27 | err = drv->suspend(dev, msg); | |
28 | } | |
29 | dev_dbg(dev, "scsi suspend: %d\n", err); | |
30 | return err; | |
31 | } | |
32 | ||
33 | static int scsi_dev_type_resume(struct device *dev) | |
34 | { | |
35 | struct device_driver *drv; | |
36 | int err = 0; | |
37 | ||
38 | drv = dev->driver; | |
39 | if (drv && drv->resume) | |
40 | err = drv->resume(dev); | |
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 | ||
48 | static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) | |
49 | { | |
50 | int err = 0; | |
51 | ||
28640516 LM |
52 | if (scsi_is_sdev_device(dev)) { |
53 | /* | |
54 | * sd is the only high-level SCSI driver to implement runtime | |
55 | * PM, and sd treats runtime suspend, system suspend, and | |
56 | * system hibernate identically (but not system freeze). | |
57 | */ | |
58 | if (pm_runtime_suspended(dev)) { | |
59 | if (msg.event == PM_EVENT_SUSPEND || | |
60 | msg.event == PM_EVENT_HIBERNATE) | |
61 | return 0; /* already suspended */ | |
62 | ||
63 | /* wake up device so that FREEZE will succeed */ | |
64 | pm_runtime_resume(dev); | |
65 | } | |
db5bd1e0 | 66 | err = scsi_dev_type_suspend(dev, msg); |
28640516 | 67 | } |
db5bd1e0 AS |
68 | return err; |
69 | } | |
70 | ||
71 | static int scsi_bus_resume_common(struct device *dev) | |
72 | { | |
73 | int err = 0; | |
74 | ||
28fd00d4 LM |
75 | if (scsi_is_sdev_device(dev)) { |
76 | /* | |
77 | * Parent device may have runtime suspended as soon as | |
78 | * it is woken up during the system resume. | |
79 | * | |
80 | * Resume it on behalf of child. | |
81 | */ | |
82 | pm_runtime_get_sync(dev->parent); | |
db5bd1e0 | 83 | err = scsi_dev_type_resume(dev); |
28fd00d4 LM |
84 | pm_runtime_put_sync(dev->parent); |
85 | } | |
bc4f2401 AS |
86 | |
87 | if (err == 0) { | |
88 | pm_runtime_disable(dev); | |
89 | pm_runtime_set_active(dev); | |
90 | pm_runtime_enable(dev); | |
91 | } | |
db5bd1e0 AS |
92 | return err; |
93 | } | |
94 | ||
95 | static int scsi_bus_suspend(struct device *dev) | |
96 | { | |
97 | return scsi_bus_suspend_common(dev, PMSG_SUSPEND); | |
98 | } | |
99 | ||
100 | static int scsi_bus_freeze(struct device *dev) | |
101 | { | |
102 | return scsi_bus_suspend_common(dev, PMSG_FREEZE); | |
103 | } | |
104 | ||
105 | static int scsi_bus_poweroff(struct device *dev) | |
106 | { | |
107 | return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); | |
108 | } | |
109 | ||
110 | #else /* CONFIG_PM_SLEEP */ | |
111 | ||
112 | #define scsi_bus_resume_common NULL | |
113 | #define scsi_bus_suspend NULL | |
114 | #define scsi_bus_freeze NULL | |
115 | #define scsi_bus_poweroff NULL | |
116 | ||
117 | #endif /* CONFIG_PM_SLEEP */ | |
118 | ||
bc4f2401 AS |
119 | #ifdef CONFIG_PM_RUNTIME |
120 | ||
121 | static int scsi_runtime_suspend(struct device *dev) | |
122 | { | |
123 | int err = 0; | |
124 | ||
125 | dev_dbg(dev, "scsi_runtime_suspend\n"); | |
126 | if (scsi_is_sdev_device(dev)) { | |
127 | err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); | |
128 | if (err == -EAGAIN) | |
129 | pm_schedule_suspend(dev, jiffies_to_msecs( | |
130 | round_jiffies_up_relative(HZ/10))); | |
131 | } | |
132 | ||
133 | /* Insert hooks here for targets, hosts, and transport classes */ | |
134 | ||
135 | return err; | |
136 | } | |
137 | ||
138 | static int scsi_runtime_resume(struct device *dev) | |
139 | { | |
140 | int err = 0; | |
141 | ||
142 | dev_dbg(dev, "scsi_runtime_resume\n"); | |
143 | if (scsi_is_sdev_device(dev)) | |
144 | err = scsi_dev_type_resume(dev); | |
145 | ||
146 | /* Insert hooks here for targets, hosts, and transport classes */ | |
147 | ||
148 | return err; | |
149 | } | |
150 | ||
151 | static int scsi_runtime_idle(struct device *dev) | |
152 | { | |
153 | int err; | |
154 | ||
155 | dev_dbg(dev, "scsi_runtime_idle\n"); | |
156 | ||
157 | /* Insert hooks here for targets, hosts, and transport classes */ | |
158 | ||
159 | if (scsi_is_sdev_device(dev)) | |
160 | err = pm_schedule_suspend(dev, 100); | |
161 | else | |
162 | err = pm_runtime_suspend(dev); | |
163 | return err; | |
164 | } | |
165 | ||
166 | int scsi_autopm_get_device(struct scsi_device *sdev) | |
167 | { | |
168 | int err; | |
169 | ||
170 | err = pm_runtime_get_sync(&sdev->sdev_gendev); | |
632e270e | 171 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 172 | pm_runtime_put_sync(&sdev->sdev_gendev); |
632e270e | 173 | else |
bc4f2401 AS |
174 | err = 0; |
175 | return err; | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); | |
178 | ||
179 | void scsi_autopm_put_device(struct scsi_device *sdev) | |
180 | { | |
181 | pm_runtime_put_sync(&sdev->sdev_gendev); | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); | |
184 | ||
185 | void scsi_autopm_get_target(struct scsi_target *starget) | |
186 | { | |
187 | pm_runtime_get_sync(&starget->dev); | |
188 | } | |
189 | ||
190 | void scsi_autopm_put_target(struct scsi_target *starget) | |
191 | { | |
192 | pm_runtime_put_sync(&starget->dev); | |
193 | } | |
194 | ||
195 | int scsi_autopm_get_host(struct Scsi_Host *shost) | |
196 | { | |
197 | int err; | |
198 | ||
199 | err = pm_runtime_get_sync(&shost->shost_gendev); | |
632e270e | 200 | if (err < 0 && err !=-EACCES) |
bc4f2401 | 201 | pm_runtime_put_sync(&shost->shost_gendev); |
632e270e | 202 | else |
bc4f2401 AS |
203 | err = 0; |
204 | return err; | |
205 | } | |
206 | ||
207 | void scsi_autopm_put_host(struct Scsi_Host *shost) | |
208 | { | |
209 | pm_runtime_put_sync(&shost->shost_gendev); | |
210 | } | |
211 | ||
212 | #else | |
213 | ||
214 | #define scsi_runtime_suspend NULL | |
215 | #define scsi_runtime_resume NULL | |
216 | #define scsi_runtime_idle NULL | |
217 | ||
218 | #endif /* CONFIG_PM_RUNTIME */ | |
219 | ||
db5bd1e0 AS |
220 | const struct dev_pm_ops scsi_bus_pm_ops = { |
221 | .suspend = scsi_bus_suspend, | |
222 | .resume = scsi_bus_resume_common, | |
223 | .freeze = scsi_bus_freeze, | |
224 | .thaw = scsi_bus_resume_common, | |
225 | .poweroff = scsi_bus_poweroff, | |
226 | .restore = scsi_bus_resume_common, | |
bc4f2401 AS |
227 | .runtime_suspend = scsi_runtime_suspend, |
228 | .runtime_resume = scsi_runtime_resume, | |
229 | .runtime_idle = scsi_runtime_idle, | |
db5bd1e0 | 230 | }; |