From 65c763694398a2de63803b264dcf906b47f9d4c1 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 30 Jun 2020 18:24:56 +0800 Subject: [PATCH] blk-mq: pass request queue into get/put budget callback blk-mq budget is abstract from scsi's device queue depth, and it is always per-request-queue instead of hctx. It can be quite absurd to get a budget from one hctx, then dequeue a request from scheduler queue, and this request may not belong to this hctx, at least for bfq and deadline. So fix the mess and always pass request queue to get/put budget callback. Signed-off-by: Ming Lei Tested-by: Baolin Wang Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Reviewed-by: Douglas Anderson Reviewed-by: Sagi Grimberg Cc: Sagi Grimberg Cc: Baolin Wang Cc: Christoph Hellwig Cc: Douglas Anderson Signed-off-by: Jens Axboe --- block/blk-mq-sched.c | 8 ++++---- block/blk-mq.c | 8 ++++---- block/blk-mq.h | 12 ++++-------- drivers/scsi/scsi_lib.c | 8 +++----- include/linux/blk-mq.h | 4 ++-- 5 files changed, 17 insertions(+), 23 deletions(-) diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index fdcc2c1dd178..a31e281e9d31 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -108,12 +108,12 @@ static int blk_mq_do_dispatch_sched(struct blk_mq_hw_ctx *hctx) break; } - if (!blk_mq_get_dispatch_budget(hctx)) + if (!blk_mq_get_dispatch_budget(q)) break; rq = e->type->ops.dispatch_request(hctx); if (!rq) { - blk_mq_put_dispatch_budget(hctx); + blk_mq_put_dispatch_budget(q); /* * We're releasing without dispatching. Holding the * budget could have blocked any "hctx"s with the @@ -173,12 +173,12 @@ static int blk_mq_do_dispatch_ctx(struct blk_mq_hw_ctx *hctx) if (!sbitmap_any_bit_set(&hctx->ctx_map)) break; - if (!blk_mq_get_dispatch_budget(hctx)) + if (!blk_mq_get_dispatch_budget(q)) break; rq = blk_mq_dequeue_from_ctx(hctx, ctx); if (!rq) { - blk_mq_put_dispatch_budget(hctx); + blk_mq_put_dispatch_budget(q); /* * We're releasing without dispatching. Holding the * budget could have blocked any "hctx"s with the diff --git a/block/blk-mq.c b/block/blk-mq.c index 72d3034fe39d..8cdc868f4249 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1284,7 +1284,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, rq = list_first_entry(list, struct request, queuelist); hctx = rq->mq_hctx; - if (!got_budget && !blk_mq_get_dispatch_budget(hctx)) { + if (!got_budget && !blk_mq_get_dispatch_budget(q)) { blk_mq_put_driver_tag(rq); no_budget_avail = true; break; @@ -1299,7 +1299,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, * we'll re-run it below. */ if (!blk_mq_mark_tag_wait(hctx, rq)) { - blk_mq_put_dispatch_budget(hctx); + blk_mq_put_dispatch_budget(q); /* * For non-shared tags, the RESTART check * will suffice. @@ -1947,11 +1947,11 @@ static blk_status_t __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx, if (q->elevator && !bypass_insert) goto insert; - if (!blk_mq_get_dispatch_budget(hctx)) + if (!blk_mq_get_dispatch_budget(q)) goto insert; if (!blk_mq_get_driver_tag(rq)) { - blk_mq_put_dispatch_budget(hctx); + blk_mq_put_dispatch_budget(q); goto insert; } diff --git a/block/blk-mq.h b/block/blk-mq.h index c6330335767c..e4af193d39ac 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -179,20 +179,16 @@ unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part); void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, unsigned int inflight[2]); -static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) +static inline void blk_mq_put_dispatch_budget(struct request_queue *q) { - struct request_queue *q = hctx->queue; - if (q->mq_ops->put_budget) - q->mq_ops->put_budget(hctx); + q->mq_ops->put_budget(q); } -static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) +static inline bool blk_mq_get_dispatch_budget(struct request_queue *q) { - struct request_queue *q = hctx->queue; - if (q->mq_ops->get_budget) - return q->mq_ops->get_budget(hctx); + return q->mq_ops->get_budget(q); return true; } diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 6ca91d09eca1..534b85e87c80 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1597,17 +1597,15 @@ static void scsi_mq_done(struct scsi_cmnd *cmd) blk_mq_complete_request(cmd->request); } -static void scsi_mq_put_budget(struct blk_mq_hw_ctx *hctx) +static void scsi_mq_put_budget(struct request_queue *q) { - struct request_queue *q = hctx->queue; struct scsi_device *sdev = q->queuedata; atomic_dec(&sdev->device_busy); } -static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx) +static bool scsi_mq_get_budget(struct request_queue *q) { - struct request_queue *q = hctx->queue; struct scsi_device *sdev = q->queuedata; return scsi_dev_queue_ready(q, sdev); @@ -1674,7 +1672,7 @@ out_dec_target_busy: if (scsi_target(sdev)->can_queue > 0) atomic_dec(&scsi_target(sdev)->target_busy); out_put_budget: - scsi_mq_put_budget(hctx); + scsi_mq_put_budget(q); switch (ret) { case BLK_STS_OK: break; diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 8986e88a986b..faa340b70123 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -270,8 +270,8 @@ struct blk_mq_queue_data { typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *); typedef void (commit_rqs_fn)(struct blk_mq_hw_ctx *); -typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *); -typedef void (put_budget_fn)(struct blk_mq_hw_ctx *); +typedef bool (get_budget_fn)(struct request_queue *); +typedef void (put_budget_fn)(struct request_queue *); typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool); typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int); typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); -- 2.25.1