diff options
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 56 |
1 files changed, 25 insertions, 31 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 4e4cd620805..ad69ef657e8 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -82,8 +82,10 @@ static int blk_mq_queue_enter(struct request_queue *q) __percpu_counter_add(&q->mq_usage_counter, 1, 1000000); smp_wmb(); - /* we have problems to freeze the queue if it's initializing */ - if (!blk_queue_bypass(q) || !blk_queue_init_done(q)) + + /* we have problems freezing the queue if it's initializing */ + if (!blk_queue_dying(q) && + (!blk_queue_bypass(q) || !blk_queue_init_done(q))) return 0; __percpu_counter_add(&q->mq_usage_counter, -1, 1000000); @@ -107,7 +109,7 @@ static void blk_mq_queue_exit(struct request_queue *q) __percpu_counter_add(&q->mq_usage_counter, -1, 1000000); } -static void __blk_mq_drain_queue(struct request_queue *q) +void blk_mq_drain_queue(struct request_queue *q) { while (true) { s64 count; @@ -118,7 +120,7 @@ static void __blk_mq_drain_queue(struct request_queue *q) if (count == 0) break; - blk_mq_run_queues(q, false); + blk_mq_start_hw_queues(q); msleep(10); } } @@ -137,12 +139,7 @@ static void blk_mq_freeze_queue(struct request_queue *q) spin_unlock_irq(q->queue_lock); if (drain) - __blk_mq_drain_queue(q); -} - -void blk_mq_drain_queue(struct request_queue *q) -{ - __blk_mq_drain_queue(q); + blk_mq_drain_queue(q); } static void blk_mq_unfreeze_queue(struct request_queue *q) @@ -183,6 +180,7 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, RB_CLEAR_NODE(&rq->rb_node); rq->rq_disk = NULL; rq->part = NULL; + rq->start_time = jiffies; #ifdef CONFIG_BLK_CGROUP rq->rl = NULL; set_start_time_ns(rq); @@ -202,6 +200,8 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, rq->sense = NULL; INIT_LIST_HEAD(&rq->timeout_list); + rq->timeout = 0; + rq->end_io = NULL; rq->end_io_data = NULL; rq->next_rq = NULL; @@ -406,16 +406,7 @@ static void blk_mq_start_request(struct request *rq, bool last) if (unlikely(blk_bidi_rq(rq))) rq->next_rq->resid_len = blk_rq_bytes(rq->next_rq); - /* - * Just mark start time and set the started bit. Due to memory - * ordering, we know we'll see the correct deadline as long as - * REQ_ATOMIC_STARTED is seen. Use the default queue timeout, - * unless one has been set in the request. - */ - if (!rq->timeout) - rq->deadline = jiffies + q->rq_timeout; - else - rq->deadline = jiffies + rq->timeout; + blk_add_timer(rq); /* * Mark us as started and clear complete. Complete might have been @@ -887,7 +878,7 @@ void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx) clear_bit(BLK_MQ_S_STOPPED, &hctx->state); preempt_disable(); - __blk_mq_run_hw_queue(hctx); + blk_mq_run_hw_queue(hctx, false); preempt_enable(); } EXPORT_SYMBOL(blk_mq_start_hw_queue); @@ -967,11 +958,6 @@ static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, list_add_tail(&rq->queuelist, &ctx->rq_list); blk_mq_hctx_mark_pending(hctx, ctx); - - /* - * We do this early, to ensure we are on the right CPU. - */ - blk_add_timer(rq); } void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue, @@ -1100,10 +1086,8 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) { init_request_from_bio(rq, bio); - if (blk_do_io_stat(rq)) { - rq->start_time = jiffies; + if (blk_do_io_stat(rq)) blk_account_io_start(rq, 1); - } } static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx, @@ -1216,7 +1200,6 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio) blk_mq_bio_to_request(rq, bio); blk_mq_start_request(rq, true); - blk_add_timer(rq); /* * For OK queue, we are done. For error, kill it. Any other @@ -1967,13 +1950,19 @@ static int blk_mq_queue_reinit_notify(struct notifier_block *nb, return NOTIFY_OK; } +/* + * Alloc a tag set to be associated with one or more request queues. + * May fail with EINVAL for various error conditions. May adjust the + * requested depth down, if if it too large. In that case, the set + * value will be stored in set->queue_depth. + */ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) { int i; if (!set->nr_hw_queues) return -EINVAL; - if (!set->queue_depth || set->queue_depth > BLK_MQ_MAX_DEPTH) + if (!set->queue_depth) return -EINVAL; if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) return -EINVAL; @@ -1981,6 +1970,11 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) if (!set->nr_hw_queues || !set->ops->queue_rq || !set->ops->map_queue) return -EINVAL; + if (set->queue_depth > BLK_MQ_MAX_DEPTH) { + pr_info("blk-mq: reduced tag depth to %u\n", + BLK_MQ_MAX_DEPTH); + set->queue_depth = BLK_MQ_MAX_DEPTH; + } set->tags = kmalloc_node(set->nr_hw_queues * sizeof(struct blk_mq_tags *), |