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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 | /* * scsi_pm.c Copyright (C) 2010 Alan Stern * * SCSI dynamic Power Management * Initial version: Alan Stern <stern@rowland.harvard.edu> */ #include <linux/pm_runtime.h> #include <linux/export.h> #include <linux/async.h> #include <scsi/scsi.h> #include <scsi/scsi_device.h> #include <scsi/scsi_driver.h> #include <scsi/scsi_host.h> #include "scsi_priv.h" static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *)) { int err; err = scsi_device_quiesce(to_scsi_device(dev)); if (err == 0) { if (cb) { err = cb(dev); if (err) scsi_device_resume(to_scsi_device(dev)); } } dev_dbg(dev, "scsi suspend: %d\n", err); return err; } static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *)) { int err = 0; if (cb) err = cb(dev); scsi_device_resume(to_scsi_device(dev)); dev_dbg(dev, "scsi resume: %d\n", err); return err; } #ifdef CONFIG_PM_SLEEP static int scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) { int err = 0; if (scsi_is_sdev_device(dev)) { /* * All the high-level SCSI drivers that implement runtime * PM treat runtime suspend, system suspend, and system * hibernate identically. */ if (pm_runtime_suspended(dev)) return 0; err = scsi_dev_type_suspend(dev, cb); } return err; } static int scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) { int err = 0; if (scsi_is_sdev_device(dev)) err = scsi_dev_type_resume(dev, cb); if (err == 0) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); } return err; } static int scsi_bus_prepare(struct device *dev) { if (scsi_is_sdev_device(dev)) { /* sd probing uses async_schedule. Wait until it finishes. */ async_synchronize_full_domain(&scsi_sd_probe_domain); } else if (scsi_is_host_device(dev)) { /* Wait until async scanning is finished */ scsi_complete_async_scans(); } return 0; } static int scsi_bus_suspend(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); } static int scsi_bus_resume(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); } static int scsi_bus_freeze(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); } static int scsi_bus_thaw(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); } static int scsi_bus_poweroff(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); } static int scsi_bus_restore(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); } #else /* CONFIG_PM_SLEEP */ #define scsi_bus_prepare NULL #define scsi_bus_suspend NULL #define scsi_bus_resume NULL #define scsi_bus_freeze NULL #define scsi_bus_thaw NULL #define scsi_bus_poweroff NULL #define scsi_bus_restore NULL #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM_RUNTIME static int sdev_blk_runtime_suspend(struct scsi_device *sdev, int (*cb)(struct device *)) { int err; err = blk_pre_runtime_suspend(sdev->request_queue); if (err) return err; if (cb) err = cb(&sdev->sdev_gendev); blk_post_runtime_suspend(sdev->request_queue, err); return err; } static int sdev_runtime_suspend(struct device *dev) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL; struct scsi_device *sdev = to_scsi_device(dev); int err; if (sdev->request_queue->dev) return sdev_blk_runtime_suspend(sdev, cb); err = scsi_dev_type_suspend(dev, cb); if (err == -EAGAIN) pm_schedule_suspend(dev, jiffies_to_msecs( round_jiffies_up_relative(HZ/10))); return err; } static int scsi_runtime_suspend(struct device *dev) { int err = 0; dev_dbg(dev, "scsi_runtime_suspend\n"); if (scsi_is_sdev_device(dev)) err = sdev_runtime_suspend(dev); /* Insert hooks here for targets, hosts, and transport classes */ return err; } static int sdev_blk_runtime_resume(struct scsi_device *sdev, int (*cb)(struct device *)) { int err = 0; blk_pre_runtime_resume(sdev->request_queue); if (cb) err = cb(&sdev->sdev_gendev); blk_post_runtime_resume(sdev->request_queue, err); return err; } static int sdev_runtime_resume(struct device *dev) { struct scsi_device *sdev = to_scsi_device(dev); const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL; if (sdev->request_queue->dev) return sdev_blk_runtime_resume(sdev, cb); else return scsi_dev_type_resume(dev, cb); } static int scsi_runtime_resume(struct device *dev) { int err = 0; dev_dbg(dev, "scsi_runtime_resume\n"); if (scsi_is_sdev_device(dev)) err = sdev_runtime_resume(dev); /* Insert hooks here for targets, hosts, and transport classes */ return err; } static int scsi_runtime_idle(struct device *dev) { int err; dev_dbg(dev, "scsi_runtime_idle\n"); /* Insert hooks here for targets, hosts, and transport classes */ if (scsi_is_sdev_device(dev)) { struct scsi_device *sdev = to_scsi_device(dev); if (sdev->request_queue->dev) { pm_runtime_mark_last_busy(dev); err = pm_runtime_autosuspend(dev); } else { err = pm_runtime_suspend(dev); } } else { err = pm_runtime_suspend(dev); } return err; } int scsi_autopm_get_device(struct scsi_device *sdev) { int err; err = pm_runtime_get_sync(&sdev->sdev_gendev); if (err < 0 && err !=-EACCES) pm_runtime_put_sync(&sdev->sdev_gendev); else err = 0; return err; } EXPORT_SYMBOL_GPL(scsi_autopm_get_device); void scsi_autopm_put_device(struct scsi_device *sdev) { pm_runtime_put_sync(&sdev->sdev_gendev); } EXPORT_SYMBOL_GPL(scsi_autopm_put_device); void scsi_autopm_get_target(struct scsi_target *starget) { pm_runtime_get_sync(&starget->dev); } void scsi_autopm_put_target(struct scsi_target *starget) { pm_runtime_put_sync(&starget->dev); } int scsi_autopm_get_host(struct Scsi_Host *shost) { int err; err = pm_runtime_get_sync(&shost->shost_gendev); if (err < 0 && err !=-EACCES) pm_runtime_put_sync(&shost->shost_gendev); else err = 0; return err; } void scsi_autopm_put_host(struct Scsi_Host *shost) { pm_runtime_put_sync(&shost->shost_gendev); } #else #define scsi_runtime_suspend NULL #define scsi_runtime_resume NULL #define scsi_runtime_idle NULL #endif /* CONFIG_PM_RUNTIME */ const struct dev_pm_ops scsi_bus_pm_ops = { .prepare = scsi_bus_prepare, .suspend = scsi_bus_suspend, .resume = scsi_bus_resume, .freeze = scsi_bus_freeze, .thaw = scsi_bus_thaw, .poweroff = scsi_bus_poweroff, .restore = scsi_bus_restore, .runtime_suspend = scsi_runtime_suspend, .runtime_resume = scsi_runtime_resume, .runtime_idle = scsi_runtime_idle, }; |