linux-kernel - [PATCH v3 1/2] nvme/pci: factor out nvme_init

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Message-ID: <20250421165525.1618434-2-csander@purestorage.com>
Date: Mon, 21 Apr 2025 10:55:24 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Keith Busch <kbusch@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>
Cc: Kanchan Joshi <joshi.k@...sung.com>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH v3 1/2] nvme/pci: factor out nvme_init_hctx() helper

nvme_init_hctx() and nvme_admin_init_hctx() are very similar. In
preparation for adding more logic, factor out a nvme_init_hctx() helper.
Rename the old nvme_init_hctx() to nvme_io_init_hctx().

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 drivers/nvme/host/pci.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index b178d52eac1b..642890ddada5 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -395,32 +395,33 @@ static int nvme_pci_npages_prp(void)
 	unsigned max_bytes = (NVME_MAX_KB_SZ * 1024) + NVME_CTRL_PAGE_SIZE;
 	unsigned nprps = DIV_ROUND_UP(max_bytes, NVME_CTRL_PAGE_SIZE);
 	return DIV_ROUND_UP(8 * nprps, NVME_CTRL_PAGE_SIZE - 8);
 }
 
-static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
-				unsigned int hctx_idx)
+static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned qid)
 {
 	struct nvme_dev *dev = to_nvme_dev(data);
-	struct nvme_queue *nvmeq = &dev->queues[0];
-
-	WARN_ON(hctx_idx != 0);
-	WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
+	struct nvme_queue *nvmeq = &dev->queues[qid];
+	struct blk_mq_tags *tags;
 
+	tags = qid ? dev->tagset.tags[qid - 1] : dev->admin_tagset.tags[0];
+	WARN_ON(tags != hctx->tags);
 	hctx->driver_data = nvmeq;
 	return 0;
 }
 
-static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
-			  unsigned int hctx_idx)
+static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+				unsigned int hctx_idx)
 {
-	struct nvme_dev *dev = to_nvme_dev(data);
-	struct nvme_queue *nvmeq = &dev->queues[hctx_idx + 1];
+	WARN_ON(hctx_idx != 0);
+	return nvme_init_hctx(hctx, data, 0);
+}
 
-	WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
-	hctx->driver_data = nvmeq;
-	return 0;
+static int nvme_io_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+			     unsigned int hctx_idx)
+{
+	return nvme_init_hctx(hctx, data, hctx_idx + 1);
 }
 
 static int nvme_pci_init_request(struct blk_mq_tag_set *set,
 		struct request *req, unsigned int hctx_idx,
 		unsigned int numa_node)
@@ -1813,11 +1814,11 @@ static const struct blk_mq_ops nvme_mq_admin_ops = {
 static const struct blk_mq_ops nvme_mq_ops = {
 	.queue_rq	= nvme_queue_rq,
 	.queue_rqs	= nvme_queue_rqs,
 	.complete	= nvme_pci_complete_rq,
 	.commit_rqs	= nvme_commit_rqs,
-	.init_hctx	= nvme_init_hctx,
+	.init_hctx	= nvme_io_init_hctx,
 	.init_request	= nvme_pci_init_request,
 	.map_queues	= nvme_pci_map_queues,
 	.timeout	= nvme_timeout,
 	.poll		= nvme_poll,
 };
-- 
2.45.2