commit 77f1e0a52d26242b6c2dba019f6ebebfb9ff701e upstream
A previous commit moved the shallow depth and BFQ depth map calculations to be done at init time, moving it outside of the hotter IO path. This potentially causes hangs if the users changes the depth of the scheduler map, by writing to the 'nr_requests' sysfs file for that device.
Add a blk-mq-sched hook that allows blk-mq to inform the scheduler if the depth changes, so that the scheduler can update its internal state.
Signed-off-by: Eric Wheeler bfq@linux.ewheeler.net Tested-by: Kai Krakow kai@kaishome.de Reported-by: Paolo Valente paolo.valente@linaro.org Fixes: f0635b8a416e ("bfq: calculate shallow depths at init time") Signed-off-by: Jens Axboe axboe@kernel.dk Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- block/bfq-iosched.c | 8 +++++++- block/blk-mq.c | 2 ++ include/linux/elevator.h | 1 + 3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index c5e2c5a011826..15e8c9955b793 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -5226,7 +5226,7 @@ static unsigned int bfq_update_depths(struct bfq_data *bfqd, return min_shallow; }
-static int bfq_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int index) +static void bfq_depth_updated(struct blk_mq_hw_ctx *hctx) { struct bfq_data *bfqd = hctx->queue->elevator->elevator_data; struct blk_mq_tags *tags = hctx->sched_tags; @@ -5234,6 +5234,11 @@ static int bfq_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int index)
min_shallow = bfq_update_depths(bfqd, &tags->bitmap_tags); sbitmap_queue_min_shallow_depth(&tags->bitmap_tags, min_shallow); +} + +static int bfq_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int index) +{ + bfq_depth_updated(hctx); return 0; }
@@ -5656,6 +5661,7 @@ static struct elevator_type iosched_bfq_mq = { .requests_merged = bfq_requests_merged, .request_merged = bfq_request_merged, .has_work = bfq_has_work, + .depth_updated = bfq_depth_updated, .init_hctx = bfq_init_hctx, .init_sched = bfq_init_queue, .exit_sched = bfq_exit_queue, diff --git a/block/blk-mq.c b/block/blk-mq.c index 414656796ecfc..4e563ee462cb6 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2887,6 +2887,8 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) } if (ret) break; + if (q->elevator && q->elevator->type->ops.mq.depth_updated) + q->elevator->type->ops.mq.depth_updated(hctx); }
if (!ret) diff --git a/include/linux/elevator.h b/include/linux/elevator.h index a02deea301857..a2bf4a6b9316d 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -99,6 +99,7 @@ struct elevator_mq_ops { void (*exit_sched)(struct elevator_queue *); int (*init_hctx)(struct blk_mq_hw_ctx *, unsigned int); void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int); + void (*depth_updated)(struct blk_mq_hw_ctx *);
bool (*allow_merge)(struct request_queue *, struct request *, struct bio *); bool (*bio_merge)(struct blk_mq_hw_ctx *, struct bio *);