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drivers/scsi/scsi_pm.c
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/* * 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> |
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#include <linux/export.h> |
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#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, pm_message_t msg) { struct device_driver *drv; int err; err = scsi_device_quiesce(to_scsi_device(dev)); if (err == 0) { drv = dev->driver; if (drv && drv->suspend) err = drv->suspend(dev, msg); } dev_dbg(dev, "scsi suspend: %d ", err); return err; } static int scsi_dev_type_resume(struct device *dev) { struct device_driver *drv; int err = 0; drv = dev->driver; if (drv && drv->resume) err = drv->resume(dev); scsi_device_resume(to_scsi_device(dev)); dev_dbg(dev, "scsi resume: %d ", err); return err; } #ifdef CONFIG_PM_SLEEP static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) { int err = 0; |
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if (scsi_is_sdev_device(dev)) { /* * sd is the only high-level SCSI driver to implement runtime * PM, and sd treats runtime suspend, system suspend, and * system hibernate identically (but not system freeze). */ if (pm_runtime_suspended(dev)) { if (msg.event == PM_EVENT_SUSPEND || msg.event == PM_EVENT_HIBERNATE) return 0; /* already suspended */ /* wake up device so that FREEZE will succeed */ pm_runtime_resume(dev); } |
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err = scsi_dev_type_suspend(dev, msg); |
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} |
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return err; } static int scsi_bus_resume_common(struct device *dev) { int err = 0; |
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if (scsi_is_sdev_device(dev)) { /* * Parent device may have runtime suspended as soon as * it is woken up during the system resume. * * Resume it on behalf of child. */ pm_runtime_get_sync(dev->parent); |
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err = scsi_dev_type_resume(dev); |
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pm_runtime_put_sync(dev->parent); } |
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if (err == 0) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); } |
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return err; } static int scsi_bus_suspend(struct device *dev) { return scsi_bus_suspend_common(dev, PMSG_SUSPEND); } static int scsi_bus_freeze(struct device *dev) { return scsi_bus_suspend_common(dev, PMSG_FREEZE); } static int scsi_bus_poweroff(struct device *dev) { return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); } #else /* CONFIG_PM_SLEEP */ #define scsi_bus_resume_common NULL #define scsi_bus_suspend NULL #define scsi_bus_freeze NULL #define scsi_bus_poweroff NULL #endif /* CONFIG_PM_SLEEP */ |
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#ifdef CONFIG_PM_RUNTIME static int scsi_runtime_suspend(struct device *dev) { int err = 0; dev_dbg(dev, "scsi_runtime_suspend "); if (scsi_is_sdev_device(dev)) { err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND); if (err == -EAGAIN) pm_schedule_suspend(dev, jiffies_to_msecs( round_jiffies_up_relative(HZ/10))); } /* Insert hooks here for targets, hosts, and transport classes */ return err; } static int scsi_runtime_resume(struct device *dev) { int err = 0; dev_dbg(dev, "scsi_runtime_resume "); if (scsi_is_sdev_device(dev)) err = scsi_dev_type_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 "); /* Insert hooks here for targets, hosts, and transport classes */ if (scsi_is_sdev_device(dev)) err = pm_schedule_suspend(dev, 100); 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); |
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if (err < 0 && err !=-EACCES) |
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pm_runtime_put_sync(&sdev->sdev_gendev); |
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else |
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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); |
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if (err < 0 && err !=-EACCES) |
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pm_runtime_put_sync(&shost->shost_gendev); |
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else |
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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 */ |
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const struct dev_pm_ops scsi_bus_pm_ops = { .suspend = scsi_bus_suspend, .resume = scsi_bus_resume_common, .freeze = scsi_bus_freeze, .thaw = scsi_bus_resume_common, .poweroff = scsi_bus_poweroff, .restore = scsi_bus_resume_common, |
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.runtime_suspend = scsi_runtime_suspend, .runtime_resume = scsi_runtime_resume, .runtime_idle = scsi_runtime_idle, |
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}; |