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Date: Wed, 30 Jan 2013 17:34:54 +0800
From: Aaron Lu <aaron.lu@...el.com>
To: Alan Stern <stern@...land.harvard.edu>,
Jens Axboe <axboe@...nel.dk>,
"Rafael J. Wysocki" <rjw@...k.pl>,
James Bottomley <James.Bottomley@...senpartnership.com>
Cc: linux-pm@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, Aaron Lu <aaron.lwe@...il.com>,
Aaron Lu <aaron.lu@...el.com>,
Shane Huang <shane.huang@....com>
Subject: [PATCH v8 4/4] sd: change to auto suspend mode
From: Lin Ming <ming.m.lin@...el.com>
Uses block layer runtime pm helper functions in
scsi_runtime_suspend/resume for devices that take advantage of it.
Remove scsi_autopm_* from sd open/release path and check_events path.
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Signed-off-by: Aaron Lu <aaron.lu@...el.com>
---
drivers/scsi/scsi_pm.c | 79 ++++++++++++++++++++++++++++++++++++++++++--------
drivers/scsi/sd.c | 13 +--------
2 files changed, 68 insertions(+), 24 deletions(-)
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index 8f6b12c..6ce00c5 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -144,18 +144,44 @@ static int scsi_bus_restore(struct device *dev)
#ifdef CONFIG_PM_RUNTIME
+static int scsi_blk_runtime_suspend(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ int err;
+
+ err = blk_pre_runtime_suspend(sdev->request_queue);
+ if (err)
+ return err;
+ err = pm_generic_runtime_suspend(dev);
+ blk_post_runtime_suspend(sdev->request_queue, err);
+
+ return err;
+}
+
+static int scsi_dev_runtime_suspend(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ int err;
+
+ err = scsi_dev_type_suspend(dev, pm ? pm->runtime_suspend : NULL);
+ 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;
- const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
dev_dbg(dev, "scsi_runtime_suspend\n");
if (scsi_is_sdev_device(dev)) {
- err = scsi_dev_type_suspend(dev,
- pm ? pm->runtime_suspend : NULL);
- if (err == -EAGAIN)
- pm_schedule_suspend(dev, jiffies_to_msecs(
- round_jiffies_up_relative(HZ/10)));
+ struct scsi_device *sdev = to_scsi_device(dev);
+ if (sdev->request_queue->dev)
+ err = scsi_blk_runtime_suspend(dev);
+ else
+ err = scsi_dev_runtime_suspend(dev);
}
/* Insert hooks here for targets, hosts, and transport classes */
@@ -163,14 +189,36 @@ static int scsi_runtime_suspend(struct device *dev)
return err;
}
+static int scsi_blk_runtime_resume(struct device *dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ int err;
+
+ blk_pre_runtime_resume(sdev->request_queue);
+ err = pm_generic_runtime_resume(dev);
+ blk_post_runtime_resume(sdev->request_queue, err);
+
+ return err;
+}
+
+static int scsi_dev_runtime_resume(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ return scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL);
+}
+
static int scsi_runtime_resume(struct device *dev)
{
int err = 0;
- const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
dev_dbg(dev, "scsi_runtime_resume\n");
- if (scsi_is_sdev_device(dev))
- err = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL);
+ if (scsi_is_sdev_device(dev)) {
+ struct scsi_device *sdev = to_scsi_device(dev);
+ if (sdev->request_queue->dev)
+ err = scsi_blk_runtime_resume(dev);
+ else
+ err = scsi_dev_runtime_resume(dev);
+ }
/* Insert hooks here for targets, hosts, and transport classes */
@@ -185,10 +233,17 @@ static int scsi_runtime_idle(struct device *dev)
/* Insert hooks here for targets, hosts, and transport classes */
- if (scsi_is_sdev_device(dev))
- err = pm_schedule_suspend(dev, 100);
- else
+ 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);
+ err = pm_runtime_autosuspend(dev);
+ } else {
+ err = pm_schedule_suspend(dev, 100);
+ }
+ } else {
err = pm_runtime_suspend(dev);
+ }
return err;
}
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 698923f..bf04dbf 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1121,10 +1121,6 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
sdev = sdkp->device;
- retval = scsi_autopm_get_device(sdev);
- if (retval)
- goto error_autopm;
-
/*
* If the device is in error recovery, wait until it is done.
* If the device is offline, then disallow any access to it.
@@ -1169,8 +1165,6 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
return 0;
error_out:
- scsi_autopm_put_device(sdev);
-error_autopm:
scsi_disk_put(sdkp);
return retval;
}
@@ -1205,7 +1199,6 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
* XXX is followed by a "rmmod sd_mod"?
*/
- scsi_autopm_put_device(sdev);
scsi_disk_put(sdkp);
return 0;
}
@@ -1367,14 +1360,9 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
retval = -ENODEV;
if (scsi_block_when_processing_errors(sdp)) {
- retval = scsi_autopm_get_device(sdp);
- if (retval)
- goto out;
-
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
sshdr);
- scsi_autopm_put_device(sdp);
}
/* failed to execute TUR, assume media not present */
@@ -2838,6 +2826,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
+ blk_pm_runtime_init(sdp->request_queue, dev);
scsi_autopm_put_device(sdp);
put_device(&sdkp->dev);
}
--
1.8.1
--
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