[PATCH v2 1/2] nvme: introduce nvme_start_request

[Sagi Grimberg]

In preparation for nvme-multipath IO stats accounting, we want the
accounting to happen in a centralized place. The request completion
is already centralized, but we need a common helper to request I/O
start.

Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/host/apple.c  | 2 +-
 drivers/nvme/host/core.c   | 6 ++++++
 drivers/nvme/host/fc.c     | 2 +-
 drivers/nvme/host/nvme.h   | 1 +
 drivers/nvme/host/pci.c    | 2 +-
 drivers/nvme/host/rdma.c   | 2 +-
 drivers/nvme/host/tcp.c    | 2 +-
 drivers/nvme/target/loop.c | 2 +-
 8 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index 5fc5ea196b40..6df4b8a5d8ab 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -763,7 +763,7 @@ static blk_status_t apple_nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 			goto out_free_cmd;
 	}
 
-	blk_mq_start_request(req);
+	nvme_start_request(req);
 	apple_nvme_submit_cmd(q, cmnd);
 	return BLK_STS_OK;
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9bacfd014e3d..64fd772de817 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -419,6 +419,12 @@ void nvme_complete_rq(struct request *req)
 }
 EXPORT_SYMBOL_GPL(nvme_complete_rq);
 
+void nvme_start_request(struct request *rq)
+{
+	blk_mq_start_request(rq);
+}
+EXPORT_SYMBOL_GPL(nvme_start_request);
+
 void nvme_complete_batch_req(struct request *req)
 {
 	trace_nvme_complete_rq(req);
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 127abaf9ba5d..2cdcc7f5d0a9 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2744,7 +2744,7 @@ nvme_fc_start_fcp_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue,
 	atomic_set(&op->state, FCPOP_STATE_ACTIVE);
 
 	if (!(op->flags & FCOP_FLAGS_AEN))
-		blk_mq_start_request(op->rq);
+		nvme_start_request(op->rq);
 
 	cmdiu->csn = cpu_to_be32(atomic_inc_return(&queue->csn));
 	ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport,
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 2d5d44a73f26..c4d1a4e9b961 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -753,6 +753,7 @@ static inline enum req_op nvme_req_op(struct nvme_command *cmd)
 }
 
 #define NVME_QID_ANY -1
+void nvme_start_request(struct request *rq);
 void nvme_init_request(struct request *req, struct nvme_command *cmd);
 void nvme_cleanup_cmd(struct request *req);
 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 3bdb97205699..e898b9e4e6e0 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -929,7 +929,7 @@ static blk_status_t nvme_prep_rq(struct nvme_dev *dev, struct request *req)
 			goto out_unmap_data;
 	}
 
-	blk_mq_start_request(req);
+	nvme_start_request(req);
 	return BLK_STS_OK;
 out_unmap_data:
 	nvme_unmap_data(dev, req);
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 8e52d2362fa1..ab9d5a17704b 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2089,7 +2089,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (ret)
 		goto unmap_qe;
 
-	blk_mq_start_request(rq);
+	nvme_start_request(rq);
 
 	if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
 	    queue->pi_support &&
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 2524b5304bfb..a1df405de7f1 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2461,7 +2461,7 @@ static blk_status_t nvme_tcp_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (unlikely(ret))
 		return ret;
 
-	blk_mq_start_request(rq);
+	nvme_start_request(rq);
 
 	nvme_tcp_queue_request(req, true, bd->last);
 
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 9750a7fca268..c327615decc2 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -145,7 +145,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (ret)
 		return ret;
 
-	blk_mq_start_request(req);
+	nvme_start_request(req);
 	iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
 	iod->req.port = queue->ctrl->port;
 	if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
-- 
2.34.1