6627b38fd9
Migrate sr to make use of block layer runtime PM. Accordingly, the SCSI bus layer runtime PM callback is simplified as all SCSI drivers implementing runtime PM now use the block layer's request-based mechanism. Note that due to the device will be polled by kernel at a constant interval, if the autosuspend delay is set longer than the polling interval then the device will never suspend. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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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