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Message-Id: <1357461697-4219-3-git-send-email-aaron.lu@intel.com>
Date: Sun, 6 Jan 2013 16:41:35 +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 v6 2/4] block: add runtime pm helpers
From: Lin Ming <ming.m.lin@...el.com>
Add runtime pm helper functions:
void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
- Initialization function for drivers to call.
int blk_pre_runtime_suspend(struct request_queue *q)
- If any requests are in the queue, return -EBUSY.
Otherwise set q->rpm_status to RPM_SUSPENDING and return 0.
void blk_post_runtime_suspend(struct request_queue *q, int err)
- If the suspend succeeded then set q->rpm_status to RPM_SUSPENDED.
Otherwise set it to RPM_ACTIVE.
void blk_pre_runtime_resume(struct request_queue *q)
- Set q->rpm_status to RPM_RESUMING.
void blk_post_runtime_resume(struct request_queue *q, int err)
- If the resume succeeded then set q->rpm_status to RPM_ACTIVE
and call __blk_run_queue.
Otherwise set q->rpm_status to RPM_SUSPENDED.
[aaron.lu@...el.com: do not touch last busy in these helper functions]
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Signed-off-by: Aaron Lu <aaron.lu@...el.com>
---
block/blk-core.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/blkdev.h | 28 +++++++++++++++++++++++++
2 files changed, 83 insertions(+)
diff --git a/block/blk-core.c b/block/blk-core.c
index c973249..6fc24bb 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -3055,6 +3055,61 @@ void blk_finish_plug(struct blk_plug *plug)
}
EXPORT_SYMBOL(blk_finish_plug);
+#ifdef CONFIG_PM_RUNTIME
+void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
+{
+ q->dev = dev;
+ q->rpm_status = RPM_ACTIVE;
+ pm_runtime_use_autosuspend(q->dev);
+}
+EXPORT_SYMBOL(blk_pm_runtime_init);
+
+int blk_pre_runtime_suspend(struct request_queue *q)
+{
+ int ret = 0;
+
+ spin_lock_irq(q->queue_lock);
+ if (q->nr_pending)
+ ret = -EBUSY;
+ else
+ q->rpm_status = RPM_SUSPENDING;
+ spin_unlock_irq(q->queue_lock);
+ return ret;
+}
+EXPORT_SYMBOL(blk_pre_runtime_suspend);
+
+void blk_post_runtime_suspend(struct request_queue *q, int err)
+{
+ spin_lock_irq(q->queue_lock);
+ if (!err)
+ q->rpm_status = RPM_SUSPENDED;
+ else
+ q->rpm_status = RPM_ACTIVE;
+ spin_unlock_irq(q->queue_lock);
+}
+EXPORT_SYMBOL(blk_post_runtime_suspend);
+
+void blk_pre_runtime_resume(struct request_queue *q)
+{
+ spin_lock_irq(q->queue_lock);
+ q->rpm_status = RPM_RESUMING;
+ spin_unlock_irq(q->queue_lock);
+}
+EXPORT_SYMBOL(blk_pre_runtime_resume);
+
+void blk_post_runtime_resume(struct request_queue *q, int err)
+{
+ spin_lock_irq(q->queue_lock);
+ if (!err) {
+ q->rpm_status = RPM_ACTIVE;
+ __blk_run_queue(q);
+ } else
+ q->rpm_status = RPM_SUSPENDED;
+ spin_unlock_irq(q->queue_lock);
+}
+EXPORT_SYMBOL(blk_post_runtime_resume);
+#endif
+
int __init blk_dev_init(void)
{
BUILD_BUG_ON(__REQ_NR_BITS > 8 *
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f94bc83..a96e144 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -19,6 +19,7 @@
#include <linux/gfp.h>
#include <linux/bsg.h>
#include <linux/smp.h>
+#include <linux/pm_runtime.h>
#include <asm/scatterlist.h>
@@ -360,6 +361,12 @@ struct request_queue {
*/
struct kobject kobj;
+#ifdef CONFIG_PM_RUNTIME
+ struct device *dev;
+ int rpm_status;
+ unsigned int nr_pending;
+#endif
+
/*
* queue settings
*/
@@ -959,6 +966,27 @@ struct request_queue *blk_alloc_queue_node(gfp_t, int);
extern void blk_put_queue(struct request_queue *);
/*
+ * block layer runtime pm functions
+ */
+#ifdef CONFIG_PM_RUNTIME
+extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
+extern int blk_pre_runtime_suspend(struct request_queue *q);
+extern void blk_post_runtime_suspend(struct request_queue *q, int err);
+extern void blk_pre_runtime_resume(struct request_queue *q);
+extern void blk_post_runtime_resume(struct request_queue *q, int err);
+#else
+static inline void blk_pm_runtime_init(struct request_queue *q,
+ struct device *dev) {}
+static inline int blk_pre_runtime_suspend(struct request_queue *q)
+{
+ return -ENOSYS;
+}
+static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
+static inline void blk_pre_runtime_resume(struct request_queue *q) {}
+static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
+#endif
+
+/*
* blk_plug permits building a queue of related requests by holding the I/O
* fragments for a short period. This allows merging of sequential requests
* into single larger request. As the requests are moved from a per-task list to
--
1.7.11.7
--
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