linux-kernel - [PATCH v2 1/2] nvme-pci: move nvme_should

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Message-Id: <1654278961-81423-1-git-send-email-mikelley@microsoft.com>
Date:   Fri,  3 Jun 2022 10:56:00 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     mikelley@...rosoft.com, caroline.subramoney@...rosoft.com,
        riwurd@...rosoft.com, nathan.obr@...rosoft.com
Subject: [PATCH v2 1/2] nvme-pci: move nvme_should_reset() to core code

Move nvme_should_reset() to core code so it fits with a subsequent
core code patch. Tweak the interface to take a nvme_ctrl argument instead
of nvme_dev, and fixup the one reference. No functional change.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/nvme/host/core.c | 19 +++++++++++++++++++
 drivers/nvme/host/nvme.h |  1 +
 drivers/nvme/host/pci.c  | 27 +--------------------------
 3 files changed, 21 insertions(+), 26 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 72f7c95..ea9ed04 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -171,6 +171,25 @@ static inline void nvme_stop_failfast_work(struct nvme_ctrl *ctrl)
 	clear_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags);
 }
 
+bool nvme_should_reset(struct nvme_ctrl *ctrl, u32 csts)
+{
+	/* If there is a reset/reinit ongoing, we shouldn't reset again. */
+	switch (ctrl->state) {
+	case NVME_CTRL_RESETTING:
+	case NVME_CTRL_CONNECTING:
+		return false;
+	default:
+		break;
+	}
+
+	/*
+	 * We shouldn't reset unless the controller is on fatal error state
+	 * or if we lost the communication with it.
+	 */
+	return (csts & NVME_CSTS_CFS) ||
+		(ctrl->subsystem && (csts & NVME_CSTS_NSSRO));
+}
+EXPORT_SYMBOL_GPL(nvme_should_reset);
 
 int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
 {
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9b72b6e..0d7e9ac 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -762,6 +762,7 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 		      u32 *result);
 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
+bool nvme_should_reset(struct nvme_ctrl *ctrl, u32 csts);
 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 5a98a7d..c57023d 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1293,31 +1293,6 @@ static void abort_endio(struct request *req, blk_status_t error)
 	blk_mq_free_request(req);
 }
 
-static bool nvme_should_reset(struct nvme_dev *dev, u32 csts)
-{
-	/* If true, indicates loss of adapter communication, possibly by a
-	 * NVMe Subsystem reset.
-	 */
-	bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO);
-
-	/* If there is a reset/reinit ongoing, we shouldn't reset again. */
-	switch (dev->ctrl.state) {
-	case NVME_CTRL_RESETTING:
-	case NVME_CTRL_CONNECTING:
-		return false;
-	default:
-		break;
-	}
-
-	/* We shouldn't reset unless the controller is on fatal error state
-	 * _or_ if we lost the communication with it.
-	 */
-	if (!(csts & NVME_CSTS_CFS) && !nssro)
-		return false;
-
-	return true;
-}
-
 static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
 {
 	/* Read a config register to help see what died. */
@@ -1355,7 +1330,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
 	/*
 	 * Reset immediately if the controller is failed
 	 */
-	if (nvme_should_reset(dev, csts)) {
+	if (nvme_should_reset(&dev->ctrl, csts)) {
 		nvme_warn_reset(dev, csts);
 		nvme_dev_disable(dev, false);
 		nvme_reset_ctrl(&dev->ctrl);
-- 
1.8.3.1