Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 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> |
Paul Gortmaker | 0970366 | 2011-05-27 09:37:25 -0400 | [diff] [blame] | 9 | #include <linux/export.h> |
Alan Stern | fea6d60 | 2012-02-17 16:25:08 -0500 | [diff] [blame] | 10 | #include <linux/async.h> |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 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 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 19 | static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *)) |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 20 | { |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 21 | int err; |
| 22 | |
| 23 | err = scsi_device_quiesce(to_scsi_device(dev)); |
| 24 | if (err == 0) { |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 25 | if (cb) { |
| 26 | err = cb(dev); |
Aaron Lu | d20ec59 | 2012-05-15 14:43:00 +0800 | [diff] [blame] | 27 | if (err) |
| 28 | scsi_device_resume(to_scsi_device(dev)); |
| 29 | } |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 30 | } |
| 31 | dev_dbg(dev, "scsi suspend: %d\n", err); |
| 32 | return err; |
| 33 | } |
| 34 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 35 | static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *)) |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 36 | { |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 37 | int err = 0; |
| 38 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 39 | if (cb) |
| 40 | err = cb(dev); |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 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 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 48 | static int |
| 49 | scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 50 | { |
| 51 | int err = 0; |
| 52 | |
Lin Ming | 2864051 | 2011-12-05 09:20:25 +0800 | [diff] [blame] | 53 | if (scsi_is_sdev_device(dev)) { |
| 54 | /* |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 55 | * All the high-level SCSI drivers that implement runtime |
| 56 | * PM treat runtime suspend, system suspend, and system |
| 57 | * hibernate identically. |
Lin Ming | 2864051 | 2011-12-05 09:20:25 +0800 | [diff] [blame] | 58 | */ |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 59 | if (pm_runtime_suspended(dev)) |
| 60 | return 0; |
Lin Ming | 2864051 | 2011-12-05 09:20:25 +0800 | [diff] [blame] | 61 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 62 | err = scsi_dev_type_suspend(dev, cb); |
Lin Ming | 2864051 | 2011-12-05 09:20:25 +0800 | [diff] [blame] | 63 | } |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 64 | |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 65 | return err; |
| 66 | } |
| 67 | |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 68 | static int |
| 69 | scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 70 | { |
| 71 | int err = 0; |
| 72 | |
Aaron Lu | 9c31d8e | 2012-11-09 15:27:53 +0800 | [diff] [blame] | 73 | if (scsi_is_sdev_device(dev)) |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 74 | err = scsi_dev_type_resume(dev, cb); |
Aaron Lu | 6334790 | 2012-11-09 15:27:52 +0800 | [diff] [blame] | 75 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 76 | if (err == 0) { |
| 77 | pm_runtime_disable(dev); |
| 78 | pm_runtime_set_active(dev); |
| 79 | pm_runtime_enable(dev); |
| 80 | } |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 81 | return err; |
| 82 | } |
| 83 | |
Alan Stern | fea6d60 | 2012-02-17 16:25:08 -0500 | [diff] [blame] | 84 | static int scsi_bus_prepare(struct device *dev) |
| 85 | { |
| 86 | if (scsi_is_sdev_device(dev)) { |
| 87 | /* sd probing uses async_schedule. Wait until it finishes. */ |
Dan Williams | a7a20d1 | 2012-03-22 17:05:11 -0700 | [diff] [blame] | 88 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
Alan Stern | fea6d60 | 2012-02-17 16:25:08 -0500 | [diff] [blame] | 89 | |
| 90 | } else if (scsi_is_host_device(dev)) { |
| 91 | /* Wait until async scanning is finished */ |
| 92 | scsi_complete_async_scans(); |
| 93 | } |
| 94 | return 0; |
| 95 | } |
| 96 | |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 97 | static int scsi_bus_suspend(struct device *dev) |
| 98 | { |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 99 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 100 | return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); |
| 101 | } |
| 102 | |
| 103 | static int scsi_bus_resume(struct device *dev) |
| 104 | { |
| 105 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 106 | return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static int scsi_bus_freeze(struct device *dev) |
| 110 | { |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 111 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 112 | return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); |
| 113 | } |
| 114 | |
| 115 | static int scsi_bus_thaw(struct device *dev) |
| 116 | { |
| 117 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 118 | return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static int scsi_bus_poweroff(struct device *dev) |
| 122 | { |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 123 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 124 | return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); |
| 125 | } |
| 126 | |
| 127 | static int scsi_bus_restore(struct device *dev) |
| 128 | { |
| 129 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 130 | return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | #else /* CONFIG_PM_SLEEP */ |
| 134 | |
Alan Stern | fea6d60 | 2012-02-17 16:25:08 -0500 | [diff] [blame] | 135 | #define scsi_bus_prepare NULL |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 136 | #define scsi_bus_suspend NULL |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 137 | #define scsi_bus_resume NULL |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 138 | #define scsi_bus_freeze NULL |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 139 | #define scsi_bus_thaw NULL |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 140 | #define scsi_bus_poweroff NULL |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 141 | #define scsi_bus_restore NULL |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 142 | |
| 143 | #endif /* CONFIG_PM_SLEEP */ |
| 144 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 145 | #ifdef CONFIG_PM_RUNTIME |
| 146 | |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 147 | static int sdev_blk_runtime_suspend(struct scsi_device *sdev, |
| 148 | int (*cb)(struct device *)) |
| 149 | { |
| 150 | int err; |
| 151 | |
| 152 | err = blk_pre_runtime_suspend(sdev->request_queue); |
| 153 | if (err) |
| 154 | return err; |
| 155 | if (cb) |
| 156 | err = cb(&sdev->sdev_gendev); |
| 157 | blk_post_runtime_suspend(sdev->request_queue, err); |
| 158 | |
| 159 | return err; |
| 160 | } |
| 161 | |
| 162 | static int sdev_runtime_suspend(struct device *dev) |
| 163 | { |
| 164 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 165 | int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL; |
| 166 | struct scsi_device *sdev = to_scsi_device(dev); |
| 167 | int err; |
| 168 | |
| 169 | if (sdev->request_queue->dev) |
| 170 | return sdev_blk_runtime_suspend(sdev, cb); |
| 171 | |
| 172 | err = scsi_dev_type_suspend(dev, cb); |
| 173 | if (err == -EAGAIN) |
| 174 | pm_schedule_suspend(dev, jiffies_to_msecs( |
| 175 | round_jiffies_up_relative(HZ/10))); |
| 176 | return err; |
| 177 | } |
| 178 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 179 | static int scsi_runtime_suspend(struct device *dev) |
| 180 | { |
| 181 | int err = 0; |
| 182 | |
| 183 | dev_dbg(dev, "scsi_runtime_suspend\n"); |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 184 | if (scsi_is_sdev_device(dev)) |
| 185 | err = sdev_runtime_suspend(dev); |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 186 | |
| 187 | /* Insert hooks here for targets, hosts, and transport classes */ |
| 188 | |
| 189 | return err; |
| 190 | } |
| 191 | |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 192 | static int sdev_blk_runtime_resume(struct scsi_device *sdev, |
| 193 | int (*cb)(struct device *)) |
| 194 | { |
| 195 | int err = 0; |
| 196 | |
| 197 | blk_pre_runtime_resume(sdev->request_queue); |
| 198 | if (cb) |
| 199 | err = cb(&sdev->sdev_gendev); |
| 200 | blk_post_runtime_resume(sdev->request_queue, err); |
| 201 | |
| 202 | return err; |
| 203 | } |
| 204 | |
| 205 | static int sdev_runtime_resume(struct device *dev) |
| 206 | { |
| 207 | struct scsi_device *sdev = to_scsi_device(dev); |
| 208 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 209 | int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL; |
| 210 | |
| 211 | if (sdev->request_queue->dev) |
| 212 | return sdev_blk_runtime_resume(sdev, cb); |
| 213 | else |
| 214 | return scsi_dev_type_resume(dev, cb); |
| 215 | } |
| 216 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 217 | static int scsi_runtime_resume(struct device *dev) |
| 218 | { |
| 219 | int err = 0; |
| 220 | |
| 221 | dev_dbg(dev, "scsi_runtime_resume\n"); |
| 222 | if (scsi_is_sdev_device(dev)) |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 223 | err = sdev_runtime_resume(dev); |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 224 | |
| 225 | /* Insert hooks here for targets, hosts, and transport classes */ |
| 226 | |
| 227 | return err; |
| 228 | } |
| 229 | |
| 230 | static int scsi_runtime_idle(struct device *dev) |
| 231 | { |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 232 | dev_dbg(dev, "scsi_runtime_idle\n"); |
| 233 | |
| 234 | /* Insert hooks here for targets, hosts, and transport classes */ |
| 235 | |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 236 | if (scsi_is_sdev_device(dev)) { |
| 237 | struct scsi_device *sdev = to_scsi_device(dev); |
| 238 | |
| 239 | if (sdev->request_queue->dev) { |
| 240 | pm_runtime_mark_last_busy(dev); |
Rafael J. Wysocki | 45f0a85 | 2013-06-03 21:49:52 +0200 | [diff] [blame] | 241 | pm_runtime_autosuspend(dev); |
| 242 | return -EBUSY; |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 243 | } |
Lin Ming | 6df339a | 2013-03-23 11:42:28 +0800 | [diff] [blame] | 244 | } |
Rafael J. Wysocki | 45f0a85 | 2013-06-03 21:49:52 +0200 | [diff] [blame] | 245 | return 0; |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | int scsi_autopm_get_device(struct scsi_device *sdev) |
| 249 | { |
| 250 | int err; |
| 251 | |
| 252 | err = pm_runtime_get_sync(&sdev->sdev_gendev); |
Rafael J. Wysocki | 632e270 | 2011-07-01 22:29:15 +0200 | [diff] [blame] | 253 | if (err < 0 && err !=-EACCES) |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 254 | pm_runtime_put_sync(&sdev->sdev_gendev); |
Rafael J. Wysocki | 632e270 | 2011-07-01 22:29:15 +0200 | [diff] [blame] | 255 | else |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 256 | err = 0; |
| 257 | return err; |
| 258 | } |
| 259 | EXPORT_SYMBOL_GPL(scsi_autopm_get_device); |
| 260 | |
| 261 | void scsi_autopm_put_device(struct scsi_device *sdev) |
| 262 | { |
| 263 | pm_runtime_put_sync(&sdev->sdev_gendev); |
| 264 | } |
| 265 | EXPORT_SYMBOL_GPL(scsi_autopm_put_device); |
| 266 | |
| 267 | void scsi_autopm_get_target(struct scsi_target *starget) |
| 268 | { |
| 269 | pm_runtime_get_sync(&starget->dev); |
| 270 | } |
| 271 | |
| 272 | void scsi_autopm_put_target(struct scsi_target *starget) |
| 273 | { |
| 274 | pm_runtime_put_sync(&starget->dev); |
| 275 | } |
| 276 | |
| 277 | int scsi_autopm_get_host(struct Scsi_Host *shost) |
| 278 | { |
| 279 | int err; |
| 280 | |
| 281 | err = pm_runtime_get_sync(&shost->shost_gendev); |
Rafael J. Wysocki | 632e270 | 2011-07-01 22:29:15 +0200 | [diff] [blame] | 282 | if (err < 0 && err !=-EACCES) |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 283 | pm_runtime_put_sync(&shost->shost_gendev); |
Rafael J. Wysocki | 632e270 | 2011-07-01 22:29:15 +0200 | [diff] [blame] | 284 | else |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 285 | err = 0; |
| 286 | return err; |
| 287 | } |
| 288 | |
| 289 | void scsi_autopm_put_host(struct Scsi_Host *shost) |
| 290 | { |
| 291 | pm_runtime_put_sync(&shost->shost_gendev); |
| 292 | } |
| 293 | |
| 294 | #else |
| 295 | |
| 296 | #define scsi_runtime_suspend NULL |
| 297 | #define scsi_runtime_resume NULL |
| 298 | #define scsi_runtime_idle NULL |
| 299 | |
| 300 | #endif /* CONFIG_PM_RUNTIME */ |
| 301 | |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 302 | const struct dev_pm_ops scsi_bus_pm_ops = { |
Alan Stern | fea6d60 | 2012-02-17 16:25:08 -0500 | [diff] [blame] | 303 | .prepare = scsi_bus_prepare, |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 304 | .suspend = scsi_bus_suspend, |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 305 | .resume = scsi_bus_resume, |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 306 | .freeze = scsi_bus_freeze, |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 307 | .thaw = scsi_bus_thaw, |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 308 | .poweroff = scsi_bus_poweroff, |
Aaron Lu | 80d2fd4 | 2012-11-09 15:27:54 +0800 | [diff] [blame] | 309 | .restore = scsi_bus_restore, |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 310 | .runtime_suspend = scsi_runtime_suspend, |
| 311 | .runtime_resume = scsi_runtime_resume, |
| 312 | .runtime_idle = scsi_runtime_idle, |
Alan Stern | db5bd1e | 2010-06-17 10:36:49 -0400 | [diff] [blame] | 313 | }; |