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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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block: Move power management code into a new source file
Move the code for runtime power management from blk-core.c into the new source file blk-pm.c. Move the corresponding declarations from <linux/blkdev.h> into <linux/blk-pm.h>. For CONFIG_PM=n, leave out the declarations of the functions that are not used in that mode. This patch not only reduces the number of #ifdefs in the block layer core code but also reduces the size of header file <linux/blkdev.h> and hence should help to reduce the build time of the Linux kernel if CONFIG_PM is not defined. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Jianchao Wang <jianchao.w.wang@oracle.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
Jens Axboe
parent
3cfa210bf3
commit
bca6b067b0
@ -228,4 +228,7 @@ config BLK_MQ_RDMA
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depends on BLOCK && INFINIBAND
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default y
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config BLK_PM
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def_bool BLOCK && PM
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source block/Kconfig.iosched
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@ -37,3 +37,4 @@ obj-$(CONFIG_BLK_WBT) += blk-wbt.o
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obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o
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obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o
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obj-$(CONFIG_BLK_SED_OPAL) += sed-opal.o
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obj-$(CONFIG_BLK_PM) += blk-pm.o
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196
block/blk-core.c
196
block/blk-core.c
@ -42,6 +42,7 @@
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#include "blk.h"
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#include "blk-mq.h"
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#include "blk-mq-sched.h"
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#include "blk-pm.h"
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#include "blk-rq-qos.h"
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#ifdef CONFIG_DEBUG_FS
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@ -1726,16 +1727,6 @@ void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part)
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}
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EXPORT_SYMBOL_GPL(part_round_stats);
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#ifdef CONFIG_PM
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static void blk_pm_put_request(struct request *rq)
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{
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if (rq->q->dev && !(rq->rq_flags & RQF_PM) && !--rq->q->nr_pending)
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pm_runtime_mark_last_busy(rq->q->dev);
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}
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#else
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static inline void blk_pm_put_request(struct request *rq) {}
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#endif
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void __blk_put_request(struct request_queue *q, struct request *req)
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{
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req_flags_t rq_flags = req->rq_flags;
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@ -3757,191 +3748,6 @@ void blk_finish_plug(struct blk_plug *plug)
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}
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EXPORT_SYMBOL(blk_finish_plug);
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#ifdef CONFIG_PM
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/**
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* blk_pm_runtime_init - Block layer runtime PM initialization routine
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* @q: the queue of the device
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* @dev: the device the queue belongs to
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*
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* Description:
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* Initialize runtime-PM-related fields for @q and start auto suspend for
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* @dev. Drivers that want to take advantage of request-based runtime PM
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* should call this function after @dev has been initialized, and its
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* request queue @q has been allocated, and runtime PM for it can not happen
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* yet(either due to disabled/forbidden or its usage_count > 0). In most
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* cases, driver should call this function before any I/O has taken place.
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*
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* This function takes care of setting up using auto suspend for the device,
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* the autosuspend delay is set to -1 to make runtime suspend impossible
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* until an updated value is either set by user or by driver. Drivers do
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* not need to touch other autosuspend settings.
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*
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* The block layer runtime PM is request based, so only works for drivers
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* that use request as their IO unit instead of those directly use bio's.
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*/
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void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
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{
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/* Don't enable runtime PM for blk-mq until it is ready */
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if (q->mq_ops) {
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pm_runtime_disable(dev);
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return;
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}
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q->dev = dev;
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q->rpm_status = RPM_ACTIVE;
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pm_runtime_set_autosuspend_delay(q->dev, -1);
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pm_runtime_use_autosuspend(q->dev);
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}
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EXPORT_SYMBOL(blk_pm_runtime_init);
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/**
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* blk_pre_runtime_suspend - Pre runtime suspend check
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* @q: the queue of the device
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*
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* Description:
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* This function will check if runtime suspend is allowed for the device
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* by examining if there are any requests pending in the queue. If there
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* are requests pending, the device can not be runtime suspended; otherwise,
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* the queue's status will be updated to SUSPENDING and the driver can
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* proceed to suspend the device.
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*
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* For the not allowed case, we mark last busy for the device so that
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* runtime PM core will try to autosuspend it some time later.
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*
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* This function should be called near the start of the device's
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* runtime_suspend callback.
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*
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* Return:
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* 0 - OK to runtime suspend the device
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* -EBUSY - Device should not be runtime suspended
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*/
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int blk_pre_runtime_suspend(struct request_queue *q)
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{
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int ret = 0;
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if (!q->dev)
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return ret;
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spin_lock_irq(q->queue_lock);
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if (q->nr_pending) {
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ret = -EBUSY;
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pm_runtime_mark_last_busy(q->dev);
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} else {
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q->rpm_status = RPM_SUSPENDING;
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}
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spin_unlock_irq(q->queue_lock);
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return ret;
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}
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EXPORT_SYMBOL(blk_pre_runtime_suspend);
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/**
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* blk_post_runtime_suspend - Post runtime suspend processing
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* @q: the queue of the device
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* @err: return value of the device's runtime_suspend function
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*
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* Description:
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* Update the queue's runtime status according to the return value of the
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* device's runtime suspend function and mark last busy for the device so
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* that PM core will try to auto suspend the device at a later time.
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*
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* This function should be called near the end of the device's
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* runtime_suspend callback.
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*/
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void blk_post_runtime_suspend(struct request_queue *q, int err)
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{
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if (!q->dev)
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return;
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spin_lock_irq(q->queue_lock);
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if (!err) {
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q->rpm_status = RPM_SUSPENDED;
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} else {
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q->rpm_status = RPM_ACTIVE;
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pm_runtime_mark_last_busy(q->dev);
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}
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_post_runtime_suspend);
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/**
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* blk_pre_runtime_resume - Pre runtime resume processing
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* @q: the queue of the device
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*
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* Description:
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* Update the queue's runtime status to RESUMING in preparation for the
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* runtime resume of the device.
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*
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* This function should be called near the start of the device's
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* runtime_resume callback.
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*/
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void blk_pre_runtime_resume(struct request_queue *q)
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{
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if (!q->dev)
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return;
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spin_lock_irq(q->queue_lock);
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q->rpm_status = RPM_RESUMING;
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_pre_runtime_resume);
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/**
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* blk_post_runtime_resume - Post runtime resume processing
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* @q: the queue of the device
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* @err: return value of the device's runtime_resume function
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*
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* Description:
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* Update the queue's runtime status according to the return value of the
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* device's runtime_resume function. If it is successfully resumed, process
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* the requests that are queued into the device's queue when it is resuming
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* and then mark last busy and initiate autosuspend for it.
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*
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* This function should be called near the end of the device's
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* runtime_resume callback.
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*/
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void blk_post_runtime_resume(struct request_queue *q, int err)
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{
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if (!q->dev)
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return;
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spin_lock_irq(q->queue_lock);
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if (!err) {
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q->rpm_status = RPM_ACTIVE;
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__blk_run_queue(q);
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pm_runtime_mark_last_busy(q->dev);
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pm_request_autosuspend(q->dev);
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} else {
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q->rpm_status = RPM_SUSPENDED;
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}
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_post_runtime_resume);
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/**
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* blk_set_runtime_active - Force runtime status of the queue to be active
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* @q: the queue of the device
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*
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* If the device is left runtime suspended during system suspend the resume
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* hook typically resumes the device and corrects runtime status
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* accordingly. However, that does not affect the queue runtime PM status
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* which is still "suspended". This prevents processing requests from the
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* queue.
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*
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* This function can be used in driver's resume hook to correct queue
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* runtime PM status and re-enable peeking requests from the queue. It
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* should be called before first request is added to the queue.
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*/
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void blk_set_runtime_active(struct request_queue *q)
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{
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spin_lock_irq(q->queue_lock);
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q->rpm_status = RPM_ACTIVE;
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pm_runtime_mark_last_busy(q->dev);
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pm_request_autosuspend(q->dev);
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_set_runtime_active);
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#endif
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int __init blk_dev_init(void)
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{
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BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS));
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188
block/blk-pm.c
Normal file
188
block/blk-pm.c
Normal file
@ -0,0 +1,188 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/blk-pm.h>
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#include <linux/blkdev.h>
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#include <linux/pm_runtime.h>
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/**
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* blk_pm_runtime_init - Block layer runtime PM initialization routine
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* @q: the queue of the device
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* @dev: the device the queue belongs to
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*
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* Description:
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* Initialize runtime-PM-related fields for @q and start auto suspend for
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* @dev. Drivers that want to take advantage of request-based runtime PM
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* should call this function after @dev has been initialized, and its
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* request queue @q has been allocated, and runtime PM for it can not happen
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* yet(either due to disabled/forbidden or its usage_count > 0). In most
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* cases, driver should call this function before any I/O has taken place.
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*
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* This function takes care of setting up using auto suspend for the device,
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* the autosuspend delay is set to -1 to make runtime suspend impossible
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* until an updated value is either set by user or by driver. Drivers do
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* not need to touch other autosuspend settings.
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*
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* The block layer runtime PM is request based, so only works for drivers
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* that use request as their IO unit instead of those directly use bio's.
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*/
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void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
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{
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/* Don't enable runtime PM for blk-mq until it is ready */
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if (q->mq_ops) {
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pm_runtime_disable(dev);
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return;
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}
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q->dev = dev;
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q->rpm_status = RPM_ACTIVE;
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pm_runtime_set_autosuspend_delay(q->dev, -1);
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pm_runtime_use_autosuspend(q->dev);
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}
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EXPORT_SYMBOL(blk_pm_runtime_init);
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/**
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* blk_pre_runtime_suspend - Pre runtime suspend check
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* @q: the queue of the device
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*
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* Description:
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* This function will check if runtime suspend is allowed for the device
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* by examining if there are any requests pending in the queue. If there
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* are requests pending, the device can not be runtime suspended; otherwise,
|
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* the queue's status will be updated to SUSPENDING and the driver can
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* proceed to suspend the device.
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*
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* For the not allowed case, we mark last busy for the device so that
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* runtime PM core will try to autosuspend it some time later.
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*
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* This function should be called near the start of the device's
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* runtime_suspend callback.
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*
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* Return:
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* 0 - OK to runtime suspend the device
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* -EBUSY - Device should not be runtime suspended
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*/
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int blk_pre_runtime_suspend(struct request_queue *q)
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{
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int ret = 0;
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if (!q->dev)
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return ret;
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spin_lock_irq(q->queue_lock);
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if (q->nr_pending) {
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ret = -EBUSY;
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pm_runtime_mark_last_busy(q->dev);
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} else {
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q->rpm_status = RPM_SUSPENDING;
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}
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spin_unlock_irq(q->queue_lock);
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return ret;
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}
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EXPORT_SYMBOL(blk_pre_runtime_suspend);
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/**
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* blk_post_runtime_suspend - Post runtime suspend processing
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* @q: the queue of the device
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* @err: return value of the device's runtime_suspend function
|
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*
|
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* Description:
|
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* Update the queue's runtime status according to the return value of the
|
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* device's runtime suspend function and mark last busy for the device so
|
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* that PM core will try to auto suspend the device at a later time.
|
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*
|
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* This function should be called near the end of the device's
|
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* runtime_suspend callback.
|
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*/
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void blk_post_runtime_suspend(struct request_queue *q, int err)
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{
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if (!q->dev)
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return;
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spin_lock_irq(q->queue_lock);
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if (!err) {
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q->rpm_status = RPM_SUSPENDED;
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} else {
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q->rpm_status = RPM_ACTIVE;
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pm_runtime_mark_last_busy(q->dev);
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}
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_post_runtime_suspend);
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/**
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* blk_pre_runtime_resume - Pre runtime resume processing
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* @q: the queue of the device
|
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*
|
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* Description:
|
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* Update the queue's runtime status to RESUMING in preparation for the
|
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* runtime resume of the device.
|
||||
*
|
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* This function should be called near the start of the device's
|
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* runtime_resume callback.
|
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*/
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void blk_pre_runtime_resume(struct request_queue *q)
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{
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if (!q->dev)
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return;
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spin_lock_irq(q->queue_lock);
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q->rpm_status = RPM_RESUMING;
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spin_unlock_irq(q->queue_lock);
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}
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EXPORT_SYMBOL(blk_pre_runtime_resume);
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|
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/**
|
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* blk_post_runtime_resume - Post runtime resume processing
|
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* @q: the queue of the device
|
||||
* @err: return value of the device's runtime_resume function
|
||||
*
|
||||
* Description:
|
||||
* Update the queue's runtime status according to the return value of the
|
||||
* device's runtime_resume function. If it is successfully resumed, process
|
||||
* the requests that are queued into the device's queue when it is resuming
|
||||
* and then mark last busy and initiate autosuspend for it.
|
||||
*
|
||||
* This function should be called near the end of the device's
|
||||
* runtime_resume callback.
|
||||
*/
|
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void blk_post_runtime_resume(struct request_queue *q, int err)
|
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{
|
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if (!q->dev)
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return;
|
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|
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spin_lock_irq(q->queue_lock);
|
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if (!err) {
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q->rpm_status = RPM_ACTIVE;
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__blk_run_queue(q);
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pm_runtime_mark_last_busy(q->dev);
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pm_request_autosuspend(q->dev);
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} else {
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q->rpm_status = RPM_SUSPENDED;
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}
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spin_unlock_irq(q->queue_lock);
|
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}
|
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EXPORT_SYMBOL(blk_post_runtime_resume);
|
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|
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/**
|
||||
* blk_set_runtime_active - Force runtime status of the queue to be active
|
||||
* @q: the queue of the device
|
||||
*
|
||||
* If the device is left runtime suspended during system suspend the resume
|
||||
* hook typically resumes the device and corrects runtime status
|
||||
* accordingly. However, that does not affect the queue runtime PM status
|
||||
* which is still "suspended". This prevents processing requests from the
|
||||
* queue.
|
||||
*
|
||||
* This function can be used in driver's resume hook to correct queue
|
||||
* runtime PM status and re-enable peeking requests from the queue. It
|
||||
* should be called before first request is added to the queue.
|
||||
*/
|
||||
void blk_set_runtime_active(struct request_queue *q)
|
||||
{
|
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spin_lock_irq(q->queue_lock);
|
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q->rpm_status = RPM_ACTIVE;
|
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pm_runtime_mark_last_busy(q->dev);
|
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pm_request_autosuspend(q->dev);
|
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spin_unlock_irq(q->queue_lock);
|
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}
|
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EXPORT_SYMBOL(blk_set_runtime_active);
|
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43
block/blk-pm.h
Normal file
43
block/blk-pm.h
Normal file
@ -0,0 +1,43 @@
|
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/* SPDX-License-Identifier: GPL-2.0 */
|
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|
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#ifndef _BLOCK_BLK_PM_H_
|
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#define _BLOCK_BLK_PM_H_
|
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|
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#include <linux/pm_runtime.h>
|
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|
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#ifdef CONFIG_PM
|
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static inline void blk_pm_requeue_request(struct request *rq)
|
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{
|
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if (rq->q->dev && !(rq->rq_flags & RQF_PM))
|
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rq->q->nr_pending--;
|
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}
|
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|
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static inline void blk_pm_add_request(struct request_queue *q,
|
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struct request *rq)
|
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{
|
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if (q->dev && !(rq->rq_flags & RQF_PM) && q->nr_pending++ == 0 &&
|
||||
(q->rpm_status == RPM_SUSPENDED || q->rpm_status == RPM_SUSPENDING))
|
||||
pm_request_resume(q->dev);
|
||||
}
|
||||
|
||||
static inline void blk_pm_put_request(struct request *rq)
|
||||
{
|
||||
if (rq->q->dev && !(rq->rq_flags & RQF_PM) && !--rq->q->nr_pending)
|
||||
pm_runtime_mark_last_busy(rq->q->dev);
|
||||
}
|
||||
#else
|
||||
static inline void blk_pm_requeue_request(struct request *rq)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void blk_pm_add_request(struct request_queue *q,
|
||||
struct request *rq)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void blk_pm_put_request(struct request *rq)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* _BLOCK_BLK_PM_H_ */
|
||||
@ -41,6 +41,7 @@
|
||||
|
||||
#include "blk.h"
|
||||
#include "blk-mq-sched.h"
|
||||
#include "blk-pm.h"
|
||||
#include "blk-wbt.h"
|
||||
|
||||
static DEFINE_SPINLOCK(elv_list_lock);
|
||||
@ -557,27 +558,6 @@ void elv_bio_merged(struct request_queue *q, struct request *rq,
|
||||
e->type->ops.sq.elevator_bio_merged_fn(q, rq, bio);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static void blk_pm_requeue_request(struct request *rq)
|
||||
{
|
||||
if (rq->q->dev && !(rq->rq_flags & RQF_PM))
|
||||
rq->q->nr_pending--;
|
||||
}
|
||||
|
||||
static void blk_pm_add_request(struct request_queue *q, struct request *rq)
|
||||
{
|
||||
if (q->dev && !(rq->rq_flags & RQF_PM) && q->nr_pending++ == 0 &&
|
||||
(q->rpm_status == RPM_SUSPENDED || q->rpm_status == RPM_SUSPENDING))
|
||||
pm_request_resume(q->dev);
|
||||
}
|
||||
#else
|
||||
static inline void blk_pm_requeue_request(struct request *rq) {}
|
||||
static inline void blk_pm_add_request(struct request_queue *q,
|
||||
struct request *rq)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
void elv_requeue_request(struct request_queue *q, struct request *rq)
|
||||
{
|
||||
/*
|
||||
|
||||
@ -8,6 +8,7 @@
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/async.h>
|
||||
#include <linux/blk-pm.h>
|
||||
|
||||
#include <scsi/scsi.h>
|
||||
#include <scsi/scsi_device.h>
|
||||
|
||||
@ -45,6 +45,7 @@
|
||||
#include <linux/init.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/blkpg.h>
|
||||
#include <linux/blk-pm.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/string_helpers.h>
|
||||
|
||||
@ -43,6 +43,7 @@
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/blk-pm.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
|
||||
24
include/linux/blk-pm.h
Normal file
24
include/linux/blk-pm.h
Normal file
@ -0,0 +1,24 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef _BLK_PM_H_
|
||||
#define _BLK_PM_H_
|
||||
|
||||
struct device;
|
||||
struct request_queue;
|
||||
|
||||
/*
|
||||
* block layer runtime pm functions
|
||||
*/
|
||||
#ifdef CONFIG_PM
|
||||
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);
|
||||
extern void blk_set_runtime_active(struct request_queue *q);
|
||||
#else
|
||||
static inline void blk_pm_runtime_init(struct request_queue *q,
|
||||
struct device *dev) {}
|
||||
#endif
|
||||
|
||||
#endif /* _BLK_PM_H_ */
|
||||
@ -1280,29 +1280,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
|
||||
extern void blk_put_queue(struct request_queue *);
|
||||
extern void blk_set_queue_dying(struct request_queue *);
|
||||
|
||||
/*
|
||||
* block layer runtime pm functions
|
||||
*/
|
||||
#ifdef CONFIG_PM
|
||||
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);
|
||||
extern void blk_set_runtime_active(struct request_queue *q);
|
||||
#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) {}
|
||||
static inline void blk_set_runtime_active(struct request_queue *q) {}
|
||||
#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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user