[PATCH 1/8] blk-mq: add blk_mq_alloc_request_hctx

[Christoph Hellwig]

From: Ming Lin <min...@ssi.samsung.com>

For some protocols like NVMe over Fabrics we need to be able to send
initialization commands to a specific queue.

Based on an earlier patch from Christoph Hellwig <h...@lst.de>.

Signed-off-by: Ming Lin <min...@ssi.samsung.com>
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 block/blk-mq.c         | 33 +++++++++++++++++++++++++++++++++
 include/linux/blk-mq.h |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 29cbc1b..7bb45ed 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -266,6 +266,39 @@ struct request *blk_mq_alloc_request(struct request_queue 
*q, int rw,
 }
 EXPORT_SYMBOL(blk_mq_alloc_request);
 
+struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
+               unsigned int flags, unsigned int hctx_idx)
+{
+       struct blk_mq_hw_ctx *hctx;
+       struct blk_mq_ctx *ctx;
+       struct request *rq;
+       struct blk_mq_alloc_data alloc_data;
+       int ret;
+
+       ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT);
+       if (ret)
+               return ERR_PTR(ret);
+
+       hctx = q->queue_hw_ctx[hctx_idx];
+       ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask));
+
+       blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
+
+       rq = __blk_mq_alloc_request(&alloc_data, rw);
+       if (!rq && !(flags & BLK_MQ_REQ_NOWAIT)) {
+               __blk_mq_run_hw_queue(hctx);
+
+               rq =  __blk_mq_alloc_request(&alloc_data, rw);
+       }
+       if (!rq) {
+               blk_queue_exit(q);
+               return ERR_PTR(-EWOULDBLOCK);
+       }
+
+       return rq;
+}
+EXPORT_SYMBOL(blk_mq_alloc_request_hctx);
+
 static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
                                  struct blk_mq_ctx *ctx, struct request *rq)
 {
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 2498fdf..6bf8735 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -196,6 +196,8 @@ enum {
 
 struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
                unsigned int flags);
+struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
+               unsigned int flags, unsigned int hctx_idx);
 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
 struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);
 
-- 
2.1.4