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blk-mq: open code __blk_mq_alloc_request in blk_mq_alloc_request_hctx
blk_mq_alloc_request_hctx is only used for NVMeoF connect commands, so tailor it to the specific requirements, and don't bother the general fast path code with its special twinkles. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Hannes Reinecke <hare@suse.de Reviewed-by: Daniel Wagner <dwagner@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -351,21 +351,13 @@ static struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data)
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{
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struct request_queue *q = data->q;
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struct elevator_queue *e = q->elevator;
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unsigned int tag;
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bool clear_ctx_on_error = false;
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u64 alloc_time_ns = 0;
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unsigned int tag;
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/* alloc_time includes depth and tag waits */
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if (blk_queue_rq_alloc_time(q))
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alloc_time_ns = ktime_get_ns();
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if (likely(!data->ctx)) {
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data->ctx = blk_mq_get_ctx(q);
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clear_ctx_on_error = true;
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}
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if (likely(!data->hctx))
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data->hctx = blk_mq_map_queue(q, data->cmd_flags,
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data->ctx);
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if (data->cmd_flags & REQ_NOWAIT)
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data->flags |= BLK_MQ_REQ_NOWAIT;
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@ -381,17 +373,16 @@ static struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data)
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e->type->ops.limit_depth &&
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!(data->flags & BLK_MQ_REQ_RESERVED))
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e->type->ops.limit_depth(data->cmd_flags, data);
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} else {
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blk_mq_tag_busy(data->hctx);
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}
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data->ctx = blk_mq_get_ctx(q);
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data->hctx = blk_mq_map_queue(q, data->cmd_flags, data->ctx);
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if (!(data->flags & BLK_MQ_REQ_INTERNAL))
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blk_mq_tag_busy(data->hctx);
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tag = blk_mq_get_tag(data);
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if (tag == BLK_MQ_NO_TAG) {
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if (clear_ctx_on_error)
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data->ctx = NULL;
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if (tag == BLK_MQ_NO_TAG)
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return NULL;
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}
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return blk_mq_rq_ctx_init(data, tag, alloc_time_ns);
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}
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@ -431,17 +422,22 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
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.flags = flags,
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.cmd_flags = op,
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};
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struct request *rq;
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u64 alloc_time_ns = 0;
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unsigned int cpu;
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unsigned int tag;
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int ret;
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/* alloc_time includes depth and tag waits */
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if (blk_queue_rq_alloc_time(q))
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alloc_time_ns = ktime_get_ns();
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/*
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* If the tag allocator sleeps we could get an allocation for a
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* different hardware context. No need to complicate the low level
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* allocator for this for the rare use case of a command tied to
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* a specific queue.
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*/
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if (WARN_ON_ONCE(!(flags & BLK_MQ_REQ_NOWAIT)))
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if (WARN_ON_ONCE(!(flags & (BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED))))
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return ERR_PTR(-EINVAL);
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if (hctx_idx >= q->nr_hw_queues)
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@ -462,11 +458,17 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
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cpu = cpumask_first_and(data.hctx->cpumask, cpu_online_mask);
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data.ctx = __blk_mq_get_ctx(q, cpu);
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if (q->elevator)
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data.flags |= BLK_MQ_REQ_INTERNAL;
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else
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blk_mq_tag_busy(data.hctx);
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ret = -EWOULDBLOCK;
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rq = __blk_mq_alloc_request(&data);
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if (!rq)
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tag = blk_mq_get_tag(&data);
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if (tag == BLK_MQ_NO_TAG)
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goto out_queue_exit;
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return rq;
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return blk_mq_rq_ctx_init(&data, tag, alloc_time_ns);
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out_queue_exit:
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blk_queue_exit(q);
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return ERR_PTR(ret);
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