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SubjectRe: [PATCH v4 2/4] block: add runtime pm helpers
Date
On Thursday, July 05, 2012, Lin Ming wrote:
> Add runtime pm helper functions:
>
> blk_pm_runtime_init()
> blk_pre_runtime_suspend()
> blk_post_runtime_suspend()
> blk_pre_runtime_resume()
> blk_post_runtime_suspend()

What exactly do you need these things for? Please be specific.

Thanks,
Rafael


> Signed-off-by: Lin Ming <ming.m.lin@intel.com>
> ---
>
> v4:
> - Adds CONFIG_PM_RUNTIME check
>
> block/blk-core.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/blkdev.h | 27 +++++++++++++++++++++
> 2 files changed, 90 insertions(+)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 3c923a7..b94ec5f 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -30,6 +30,7 @@
> #include <linux/list_sort.h>
> #include <linux/delay.h>
> #include <linux/ratelimit.h>
> +#include <linux/pm_runtime.h>
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/block.h>
> @@ -2982,6 +2983,68 @@ 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);
> + pm_runtime_mark_last_busy(q->dev);
> + pm_runtime_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;
> + pm_runtime_mark_last_busy(q->dev);
> + }
> + 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);
> + pm_runtime_mark_last_busy(q->dev);
> + pm_request_autosuspend(q->dev);
> + } 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 ba43f40..a5b255e 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -346,6 +346,12 @@ struct request_queue {
> */
> struct kobject kobj;
>
> +#ifdef CONFIG_PM_RUNTIME
> + struct device *dev;
> + int rpm_status;
> + unsigned int nr_pending;
> +#endif
> +
> /*
> * queue settings
> */
> @@ -893,6 +899,27 @@ 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
>



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