95897910a5
It makes no sense to flush the cache of a device without medium. Errors during suspend must be handled according to their causes. Errors due to missing media or unplugged devices must be ignored. Errors due to devices being offlined must also be ignored. The error returns must be modified so that the generic layer understands them. [jejb: fix up whitespace and other formatting problems] Signed-off-by: Oliver Neukum <oneukum@suse.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
315 lines
7 KiB
C
315 lines
7 KiB
C
/*
|
|
* 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 nearly identically. In all cases the requirements
|
|
* for runtime suspension are stricter.
|
|
*/
|
|
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)
|
|
{
|
|
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);
|
|
pm_runtime_autosuspend(dev);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
};
|