From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , "Rafael J. Wysocki" , Alan Stern , linux-pm@vger.kernel.org, Greg Kroah-Hartman , Christoph Hellwig , Bart Van Assche , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Subject: [PATCH RFC 2/4] blk-mq: introduce blk_mq_pm_queue_idle() Date: Thu, 12 Jul 2018 00:29:04 +0800 Message-Id: <20180711162906.14271-3-ming.lei@redhat.com> In-Reply-To: <20180711162906.14271-1-ming.lei@redhat.com> References: <20180711162906.14271-1-ming.lei@redhat.com> List-ID: This helper will be used to decide if this block device can be put into runtime suspend. Cc: "Rafael J. Wysocki" Cc: Alan Stern Cc: linux-pm@vger.kernel.org Cc: Greg Kroah-Hartman Cc: Christoph Hellwig Cc: Bart Van Assche Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Ming Lei --- block/blk-mq.c | 22 ++++++++++++++++++++++ block/blk-mq.h | 3 +++ 2 files changed, 25 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index 73a43b81b17d..3a78fed87959 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -58,6 +58,28 @@ static int blk_mq_poll_stats_bkt(const struct request *rq) return bucket; } +static void blk_mq_pm_check_idle(struct blk_mq_hw_ctx *hctx, + struct request *rq, void *priv, bool reserved) +{ + unsigned long *cnt = priv; + + if (!(rq->rq_flags & RQF_PM)) + (*cnt)++; +} + +bool blk_mq_pm_queue_idle(struct request_queue *q) +{ + unsigned long idle_cnt; + + if (!blk_mq_support_runtime_pm(q)) + return false; + + idle_cnt = 0; + blk_mq_queue_tag_busy_iter(q, blk_mq_pm_check_idle, &idle_cnt); + + return idle_cnt == 0; +} + /* * Check if any of the ctx's have pending work in this hardware queue */ diff --git a/block/blk-mq.h b/block/blk-mq.h index bc2b24735ed4..b64f6f69176a 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -88,6 +88,9 @@ extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); void blk_mq_release(struct request_queue *q); +/* blk-mq pm helpers */ +bool blk_mq_pm_queue_idle(struct request_queue *q); + /** * blk_mq_rq_state() - read the current MQ_RQ_* state of a request * @rq: target request. -- 2.9.5