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![Aaron Lu](/assets/img/avatar_default.png)
Use of pm_message_t is deprecated and device driver is not supposed to use that. This patch migrates the SCSI bus level pm callbacks to call device's pm callbacks defined in its driver's dev_pm_ops. This is achieved by finding out which device pm callback should be used in bus callback function, and then pass that callback function pointer as a param to the scsi_bus_{suspend,resume}_common routine, which will further pass that callback to scsi_dev_type_{suspend,resume} after proper handling. The special case for freeze in scsi_bus_suspend_common is not necessary since there is no high level SCSI driver has implemented freeze, so no need to runtime resume the device if it is in runtime suspended state for system freeze, just return like the system suspend/hibernate case. Since only sd has implemented drv->suspend/drv->resume, and I'll update sd driver to use the new callbacks in the following patch, there is no need to fallback to call drv->suspend/drv->resume if dev_pm_ops is NULL. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
260 lines
5.8 KiB
C
260 lines
5.8 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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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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#ifdef CONFIG_PM_SLEEP
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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 identically.
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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 scsi_runtime_suspend(struct device *dev)
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{
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int err = 0;
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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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 = scsi_dev_type_suspend(dev,
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pm ? pm->runtime_suspend : NULL);
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if (err == -EAGAIN)
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pm_schedule_suspend(dev, jiffies_to_msecs(
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round_jiffies_up_relative(HZ/10)));
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}
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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_resume(struct device *dev)
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{
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int err = 0;
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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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 = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL);
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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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int err;
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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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err = pm_schedule_suspend(dev, 100);
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else
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err = pm_runtime_suspend(dev);
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return err;
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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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