linux-kernel - [PATCH v16 3/9] nvme: Introduce nvme_execute_passthru_rq to call nvme_passthru

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Date:   Fri, 24 Jul 2020 11:25:14 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v16 3/9] nvme: Introduce nvme_execute_passthru_rq to call nvme_passthru_[start|end]()

Introduce a new nvme_execute_passthru_rq() helper which calls
nvme_passthru_[start|end]() around blk_execute_rq(). This ensures
all passthru calls (including nvme_submit_io()) will be wrapped
appropriately.

nvme_execute_passthru_rq() will also be useful for the nvmet passthru
code and is exported in the NVME_TARGET_PASSTHRU namespace.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/nvme/host/core.c | 22 +++++++++++++++-------
 drivers/nvme/host/nvme.h |  1 +
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index bd07b4edd6fc..ccca36f881d6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1017,6 +1017,20 @@ static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
 	}
 }
 
+void nvme_execute_passthru_rq(struct request *rq)
+{
+	struct nvme_command *cmd = nvme_req(rq)->cmd;
+	struct nvme_ctrl *ctrl = nvme_req(rq)->ctrl;
+	struct nvme_ns *ns = rq->q->queuedata;
+	struct gendisk *disk = ns ? ns->disk : NULL;
+	u32 effects;
+
+	effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode);
+	blk_execute_rq(rq->q, disk, rq, 0);
+	nvme_passthru_end(ctrl, effects);
+}
+EXPORT_SYMBOL_NS_GPL(nvme_execute_passthru_rq, NVME_TARGET_PASSTHRU);
+
 static int nvme_submit_user_cmd(struct request_queue *q,
 		struct nvme_command *cmd, void __user *ubuffer,
 		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
@@ -1055,7 +1069,7 @@ static int nvme_submit_user_cmd(struct request_queue *q,
 		}
 	}
 
-	blk_execute_rq(req->q, disk, req, 0);
+	nvme_execute_passthru_rq(req);
 	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
 		ret = -EINTR;
 	else
@@ -1489,7 +1503,6 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	struct nvme_passthru_cmd cmd;
 	struct nvme_command c;
 	unsigned timeout = 0;
-	u32 effects;
 	u64 result;
 	int status;
 
@@ -1516,12 +1529,10 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	if (cmd.timeout_ms)
 		timeout = msecs_to_jiffies(cmd.timeout_ms);
 
-	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
 	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 			nvme_to_user_ptr(cmd.addr), cmd.data_len,
 			nvme_to_user_ptr(cmd.metadata), cmd.metadata_len,
 			0, &result, timeout);
-	nvme_passthru_end(ctrl, effects);
 
 	if (status >= 0) {
 		if (put_user(result, &ucmd->result))
@@ -1537,7 +1548,6 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	struct nvme_passthru_cmd64 cmd;
 	struct nvme_command c;
 	unsigned timeout = 0;
-	u32 effects;
 	int status;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -1563,12 +1573,10 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	if (cmd.timeout_ms)
 		timeout = msecs_to_jiffies(cmd.timeout_ms);
 
-	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
 	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 			nvme_to_user_ptr(cmd.addr), cmd.data_len,
 			nvme_to_user_ptr(cmd.metadata), cmd.metadata_len,
 			0, &cmd.result, timeout);
-	nvme_passthru_end(ctrl, effects);
 
 	if (status >= 0) {
 		if (put_user(cmd.result, &ucmd->result))
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index d4dbf7280500..c43e0e4e0b97 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -786,5 +786,6 @@ static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
 
 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 			 u8 opcode);
+void nvme_execute_passthru_rq(struct request *rq);
 
 #endif /* _NVME_H */
-- 
2.20.1