285 lines
6.3 KiB
C
285 lines
6.3 KiB
C
/*
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* scsi_pm.c Copyright (C) 2010 Alan Stern
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*
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* SCSI dynamic Power Management
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* Initial version: Alan Stern <stern@rowland.harvard.edu>
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*/
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#include <linux/pm_runtime.h>
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#include <linux/export.h>
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#include <linux/async.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_host.h>
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#include "scsi_priv.h"
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#ifdef CONFIG_PM_SLEEP
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static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *))
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{
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int err;
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err = scsi_device_quiesce(to_scsi_device(dev));
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if (err == 0) {
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if (cb) {
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err = cb(dev);
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if (err)
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scsi_device_resume(to_scsi_device(dev));
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}
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}
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dev_dbg(dev, "scsi suspend: %d\n", err);
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return err;
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}
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static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *))
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{
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int err = 0;
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if (cb)
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err = cb(dev);
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scsi_device_resume(to_scsi_device(dev));
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dev_dbg(dev, "scsi resume: %d\n", err);
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return err;
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}
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static int
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scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *))
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{
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int err = 0;
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if (scsi_is_sdev_device(dev)) {
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/*
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* All the high-level SCSI drivers that implement runtime
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* PM treat runtime suspend, system suspend, and system
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* hibernate nearly identically. In all cases the requirements
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* for runtime suspension are stricter.
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*/
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if (pm_runtime_suspended(dev))
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return 0;
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err = scsi_dev_type_suspend(dev, cb);
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}
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return err;
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}
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static int
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scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *))
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{
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int err = 0;
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if (scsi_is_sdev_device(dev))
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err = scsi_dev_type_resume(dev, cb);
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if (err == 0) {
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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}
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return err;
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}
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static int scsi_bus_prepare(struct device *dev)
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{
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if (scsi_is_sdev_device(dev)) {
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/* sd probing uses async_schedule. Wait until it finishes. */
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async_synchronize_full_domain(&scsi_sd_probe_domain);
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} else if (scsi_is_host_device(dev)) {
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/* Wait until async scanning is finished */
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scsi_complete_async_scans();
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}
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return 0;
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}
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static int scsi_bus_suspend(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL);
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}
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static int scsi_bus_resume(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_resume_common(dev, pm ? pm->resume : NULL);
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}
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static int scsi_bus_freeze(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL);
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}
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static int scsi_bus_thaw(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL);
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}
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static int scsi_bus_poweroff(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL);
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}
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static int scsi_bus_restore(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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return scsi_bus_resume_common(dev, pm ? pm->restore : NULL);
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}
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#else /* CONFIG_PM_SLEEP */
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#define scsi_bus_prepare NULL
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#define scsi_bus_suspend NULL
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#define scsi_bus_resume NULL
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#define scsi_bus_freeze NULL
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#define scsi_bus_thaw NULL
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#define scsi_bus_poweroff NULL
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#define scsi_bus_restore NULL
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM_RUNTIME
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static int sdev_runtime_suspend(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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struct scsi_device *sdev = to_scsi_device(dev);
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int err;
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err = blk_pre_runtime_suspend(sdev->request_queue);
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if (err)
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return err;
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if (pm && pm->runtime_suspend)
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err = pm->runtime_suspend(dev);
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blk_post_runtime_suspend(sdev->request_queue, err);
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return err;
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}
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static int scsi_runtime_suspend(struct device *dev)
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{
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int err = 0;
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dev_dbg(dev, "scsi_runtime_suspend\n");
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if (scsi_is_sdev_device(dev))
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err = sdev_runtime_suspend(dev);
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/* Insert hooks here for targets, hosts, and transport classes */
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return err;
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}
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static int sdev_runtime_resume(struct device *dev)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int err = 0;
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blk_pre_runtime_resume(sdev->request_queue);
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if (pm && pm->runtime_resume)
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err = pm->runtime_resume(dev);
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blk_post_runtime_resume(sdev->request_queue, err);
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return err;
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}
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static int scsi_runtime_resume(struct device *dev)
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{
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int err = 0;
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dev_dbg(dev, "scsi_runtime_resume\n");
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if (scsi_is_sdev_device(dev))
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err = sdev_runtime_resume(dev);
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/* Insert hooks here for targets, hosts, and transport classes */
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return err;
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}
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static int scsi_runtime_idle(struct device *dev)
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{
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dev_dbg(dev, "scsi_runtime_idle\n");
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/* Insert hooks here for targets, hosts, and transport classes */
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if (scsi_is_sdev_device(dev)) {
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pm_runtime_mark_last_busy(dev);
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pm_runtime_autosuspend(dev);
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return -EBUSY;
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}
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return 0;
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}
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int scsi_autopm_get_device(struct scsi_device *sdev)
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{
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int err;
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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;
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return err;
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}
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EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
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void scsi_autopm_put_device(struct scsi_device *sdev)
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{
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pm_runtime_put_sync(&sdev->sdev_gendev);
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}
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EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
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void scsi_autopm_get_target(struct scsi_target *starget)
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{
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pm_runtime_get_sync(&starget->dev);
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}
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void scsi_autopm_put_target(struct scsi_target *starget)
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{
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pm_runtime_put_sync(&starget->dev);
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}
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int scsi_autopm_get_host(struct Scsi_Host *shost)
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{
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int err;
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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;
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return err;
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}
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void scsi_autopm_put_host(struct Scsi_Host *shost)
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{
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pm_runtime_put_sync(&shost->shost_gendev);
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}
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#else
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#define scsi_runtime_suspend NULL
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#define scsi_runtime_resume NULL
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#define scsi_runtime_idle NULL
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#endif /* CONFIG_PM_RUNTIME */
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const struct dev_pm_ops scsi_bus_pm_ops = {
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.prepare = scsi_bus_prepare,
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.suspend = scsi_bus_suspend,
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.resume = scsi_bus_resume,
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.freeze = scsi_bus_freeze,
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.thaw = scsi_bus_thaw,
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.poweroff = scsi_bus_poweroff,
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.restore = scsi_bus_restore,
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.runtime_suspend = scsi_runtime_suspend,
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.runtime_resume = scsi_runtime_resume,
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.runtime_idle = scsi_runtime_idle,
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};
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