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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>
9
10#include <scsi/scsi.h>
11#include <scsi/scsi_device.h>
12#include <scsi/scsi_driver.h>
13#include <scsi/scsi_host.h>
14
15#include "scsi_priv.h"
16
17static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg)
18{
19 struct device_driver *drv;
20 int err;
21
22 err = scsi_device_quiesce(to_scsi_device(dev));
23 if (err == 0) {
24 drv = dev->driver;
25 if (drv && drv->suspend)
26 err = drv->suspend(dev, msg);
27 }
28 dev_dbg(dev, "scsi suspend: %d\n", err);
29 return err;
30}
31
32static int scsi_dev_type_resume(struct device *dev)
33{
34 struct device_driver *drv;
35 int err = 0;
36
37 drv = dev->driver;
38 if (drv && drv->resume)
39 err = drv->resume(dev);
40 scsi_device_resume(to_scsi_device(dev));
41 dev_dbg(dev, "scsi resume: %d\n", err);
42 return err;
43}
44
45#ifdef CONFIG_PM_SLEEP
46
47static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
48{
49 int err = 0;
50
51 if (scsi_is_sdev_device(dev))
52 err = scsi_dev_type_suspend(dev, msg);
53 return err;
54}
55
56static int scsi_bus_resume_common(struct device *dev)
57{
58 int err = 0;
59
60 if (scsi_is_sdev_device(dev))
61 err = scsi_dev_type_resume(dev);
62
63 if (err == 0) {
64 pm_runtime_disable(dev);
65 pm_runtime_set_active(dev);
66 pm_runtime_enable(dev);
67 }
68 return err;
69}
70
71static int scsi_bus_suspend(struct device *dev)
72{
73 return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
74}
75
76static int scsi_bus_freeze(struct device *dev)
77{
78 return scsi_bus_suspend_common(dev, PMSG_FREEZE);
79}
80
81static int scsi_bus_poweroff(struct device *dev)
82{
83 return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
84}
85
86#else /* CONFIG_PM_SLEEP */
87
88#define scsi_bus_resume_common NULL
89#define scsi_bus_suspend NULL
90#define scsi_bus_freeze NULL
91#define scsi_bus_poweroff NULL
92
93#endif /* CONFIG_PM_SLEEP */
94
95#ifdef CONFIG_PM_RUNTIME
96
97static int scsi_runtime_suspend(struct device *dev)
98{
99 int err = 0;
100
101 dev_dbg(dev, "scsi_runtime_suspend\n");
102 if (scsi_is_sdev_device(dev)) {
103 err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND);
104 if (err == -EAGAIN)
105 pm_schedule_suspend(dev, jiffies_to_msecs(
106 round_jiffies_up_relative(HZ/10)));
107 }
108
109 /* Insert hooks here for targets, hosts, and transport classes */
110
111 return err;
112}
113
114static int scsi_runtime_resume(struct device *dev)
115{
116 int err = 0;
117
118 dev_dbg(dev, "scsi_runtime_resume\n");
119 if (scsi_is_sdev_device(dev))
120 err = scsi_dev_type_resume(dev);
121
122 /* Insert hooks here for targets, hosts, and transport classes */
123
124 return err;
125}
126
127static int scsi_runtime_idle(struct device *dev)
128{
129 int err;
130
131 dev_dbg(dev, "scsi_runtime_idle\n");
132
133 /* Insert hooks here for targets, hosts, and transport classes */
134
135 if (scsi_is_sdev_device(dev))
136 err = pm_schedule_suspend(dev, 100);
137 else
138 err = pm_runtime_suspend(dev);
139 return err;
140}
141
142int scsi_autopm_get_device(struct scsi_device *sdev)
143{
144 int err;
145
146 err = pm_runtime_get_sync(&sdev->sdev_gendev);
147 if (err < 0 && err !=-EACCES)
148 pm_runtime_put_sync(&sdev->sdev_gendev);
149 else
150 err = 0;
151 return err;
152}
153EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
154
155void scsi_autopm_put_device(struct scsi_device *sdev)
156{
157 pm_runtime_put_sync(&sdev->sdev_gendev);
158}
159EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
160
161void scsi_autopm_get_target(struct scsi_target *starget)
162{
163 pm_runtime_get_sync(&starget->dev);
164}
165
166void scsi_autopm_put_target(struct scsi_target *starget)
167{
168 pm_runtime_put_sync(&starget->dev);
169}
170
171int scsi_autopm_get_host(struct Scsi_Host *shost)
172{
173 int err;
174
175 err = pm_runtime_get_sync(&shost->shost_gendev);
176 if (err < 0 && err !=-EACCES)
177 pm_runtime_put_sync(&shost->shost_gendev);
178 else
179 err = 0;
180 return err;
181}
182
183void scsi_autopm_put_host(struct Scsi_Host *shost)
184{
185 pm_runtime_put_sync(&shost->shost_gendev);
186}
187
188#else
189
190#define scsi_runtime_suspend NULL
191#define scsi_runtime_resume NULL
192#define scsi_runtime_idle NULL
193
194#endif /* CONFIG_PM_RUNTIME */
195
196const struct dev_pm_ops scsi_bus_pm_ops = {
197 .suspend = scsi_bus_suspend,
198 .resume = scsi_bus_resume_common,
199 .freeze = scsi_bus_freeze,
200 .thaw = scsi_bus_resume_common,
201 .poweroff = scsi_bus_poweroff,
202 .restore = scsi_bus_resume_common,
203 .runtime_suspend = scsi_runtime_suspend,
204 .runtime_resume = scsi_runtime_resume,
205 .runtime_idle = scsi_runtime_idle,
206};
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>
9#include <linux/export.h>
10#include <linux/async.h>
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
19static 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 if (err)
30 scsi_device_resume(to_scsi_device(dev));
31 }
32 }
33 dev_dbg(dev, "scsi suspend: %d\n", err);
34 return err;
35}
36
37static 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
52static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
53{
54 int err = 0;
55
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 }
70 err = scsi_dev_type_suspend(dev, msg);
71 }
72 return err;
73}
74
75static int scsi_bus_resume_common(struct device *dev)
76{
77 int err = 0;
78
79 if (scsi_is_sdev_device(dev)) {
80 /*
81 * Parent device may have runtime suspended as soon as
82 * it is woken up during the system resume.
83 *
84 * Resume it on behalf of child.
85 */
86 pm_runtime_get_sync(dev->parent);
87 err = scsi_dev_type_resume(dev);
88 pm_runtime_put_sync(dev->parent);
89 }
90
91 if (err == 0) {
92 pm_runtime_disable(dev);
93 pm_runtime_set_active(dev);
94 pm_runtime_enable(dev);
95 }
96 return err;
97}
98
99static int scsi_bus_prepare(struct device *dev)
100{
101 if (scsi_is_sdev_device(dev)) {
102 /* sd probing uses async_schedule. Wait until it finishes. */
103 async_synchronize_full_domain(&scsi_sd_probe_domain);
104
105 } else if (scsi_is_host_device(dev)) {
106 /* Wait until async scanning is finished */
107 scsi_complete_async_scans();
108 }
109 return 0;
110}
111
112static int scsi_bus_suspend(struct device *dev)
113{
114 return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
115}
116
117static int scsi_bus_freeze(struct device *dev)
118{
119 return scsi_bus_suspend_common(dev, PMSG_FREEZE);
120}
121
122static int scsi_bus_poweroff(struct device *dev)
123{
124 return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
125}
126
127#else /* CONFIG_PM_SLEEP */
128
129#define scsi_bus_resume_common NULL
130#define scsi_bus_prepare NULL
131#define scsi_bus_suspend NULL
132#define scsi_bus_freeze NULL
133#define scsi_bus_poweroff NULL
134
135#endif /* CONFIG_PM_SLEEP */
136
137#ifdef CONFIG_PM_RUNTIME
138
139static int scsi_runtime_suspend(struct device *dev)
140{
141 int err = 0;
142
143 dev_dbg(dev, "scsi_runtime_suspend\n");
144 if (scsi_is_sdev_device(dev)) {
145 err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND);
146 if (err == -EAGAIN)
147 pm_schedule_suspend(dev, jiffies_to_msecs(
148 round_jiffies_up_relative(HZ/10)));
149 }
150
151 /* Insert hooks here for targets, hosts, and transport classes */
152
153 return err;
154}
155
156static int scsi_runtime_resume(struct device *dev)
157{
158 int err = 0;
159
160 dev_dbg(dev, "scsi_runtime_resume\n");
161 if (scsi_is_sdev_device(dev))
162 err = scsi_dev_type_resume(dev);
163
164 /* Insert hooks here for targets, hosts, and transport classes */
165
166 return err;
167}
168
169static int scsi_runtime_idle(struct device *dev)
170{
171 int err;
172
173 dev_dbg(dev, "scsi_runtime_idle\n");
174
175 /* Insert hooks here for targets, hosts, and transport classes */
176
177 if (scsi_is_sdev_device(dev))
178 err = pm_schedule_suspend(dev, 100);
179 else
180 err = pm_runtime_suspend(dev);
181 return err;
182}
183
184int scsi_autopm_get_device(struct scsi_device *sdev)
185{
186 int err;
187
188 err = pm_runtime_get_sync(&sdev->sdev_gendev);
189 if (err < 0 && err !=-EACCES)
190 pm_runtime_put_sync(&sdev->sdev_gendev);
191 else
192 err = 0;
193 return err;
194}
195EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
196
197void scsi_autopm_put_device(struct scsi_device *sdev)
198{
199 pm_runtime_put_sync(&sdev->sdev_gendev);
200}
201EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
202
203void scsi_autopm_get_target(struct scsi_target *starget)
204{
205 pm_runtime_get_sync(&starget->dev);
206}
207
208void scsi_autopm_put_target(struct scsi_target *starget)
209{
210 pm_runtime_put_sync(&starget->dev);
211}
212
213int scsi_autopm_get_host(struct Scsi_Host *shost)
214{
215 int err;
216
217 err = pm_runtime_get_sync(&shost->shost_gendev);
218 if (err < 0 && err !=-EACCES)
219 pm_runtime_put_sync(&shost->shost_gendev);
220 else
221 err = 0;
222 return err;
223}
224
225void scsi_autopm_put_host(struct Scsi_Host *shost)
226{
227 pm_runtime_put_sync(&shost->shost_gendev);
228}
229
230#else
231
232#define scsi_runtime_suspend NULL
233#define scsi_runtime_resume NULL
234#define scsi_runtime_idle NULL
235
236#endif /* CONFIG_PM_RUNTIME */
237
238const struct dev_pm_ops scsi_bus_pm_ops = {
239 .prepare = scsi_bus_prepare,
240 .suspend = scsi_bus_suspend,
241 .resume = scsi_bus_resume_common,
242 .freeze = scsi_bus_freeze,
243 .thaw = scsi_bus_resume_common,
244 .poweroff = scsi_bus_poweroff,
245 .restore = scsi_bus_resume_common,
246 .runtime_suspend = scsi_runtime_suspend,
247 .runtime_resume = scsi_runtime_resume,
248 .runtime_idle = scsi_runtime_idle,
249};