On Sun, 6 Jan 2013, Aaron Lu wrote:
> From: Lin Ming <ming.m....@intel.com>
>
> When a request is added:
> If device is suspended or is suspending and the request is not a
> PM request, resume the device.
>
> When the last request finishes:
> Call pm_runtime_mark_last_busy() and pm_runtime_autosuspend().
>
> When pick a request:
> If device is resuming/suspending, then only PM request is allowed to go.
> Return NULL for other cases.
>
> [aaron...@intel.com: PM request does not involve nr_pending counting]
> [aaron...@intel.com: No need to check q->dev]
> [aaron...@intel.com: Autosuspend when the last request finished]
> Signed-off-by: Lin Ming <ming.m....@intel.com>
> Signed-off-by: Aaron Lu <aaron...@intel.com>
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -974,6 +974,40 @@ 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);
> +
> +static inline void blk_pm_put_request(struct request *rq)
> +{
> + if (!(rq->cmd_flags & REQ_PM) && !--rq->q->nr_pending) {
> + pm_runtime_mark_last_busy(rq->q->dev);
> + pm_runtime_autosuspend(rq->q->dev);
> + }
> +}
> +
> +static inline struct request *blk_pm_peek_request(
> + struct request_queue *q, struct request *rq)
> +{
> + if (q->rpm_status == RPM_SUSPENDED ||
> + (q->rpm_status != RPM_ACTIVE && !(rq->cmd_flags & REQ_PM)))
> + return NULL;
> + else
> + return rq;
> +}
> +
> +static inline void blk_pm_requeue_request(struct request *rq)
> +{
> + if (!(rq->cmd_flags & REQ_PM))
> + rq->q->nr_pending--;
> +}
> +
> +static inline void blk_pm_add_request(struct request_queue *q,
> + struct request *rq)
> +{
> + if (!(rq->cmd_flags & REQ_PM) &&
> + q->nr_pending++ == 0 &&
> + (q->rpm_status == RPM_SUSPENDED ||
> + q->rpm_status == RPM_SUSPENDING))
> + pm_request_resume(q->dev);
> +}
These routines also don't belong in include/linux. And they don't need
to be marked inline.
Alan Stern
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