nvme: merge nvme_shutdown_ctrl into nvme_disable_ctrl

Many of the callers decide which one to use based on a bool argument and
there is at least some code to be shared, so merge these two.  Also
move a comment specific to a single callsite to that callsite.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hector Martin <marcan@marcan.st>

drivers/nvme/host/apple.c

@@ -829,10 +829,7 @@ static void apple_nvme_disable(struct apple_nvme *anv, bool shutdown)
 			apple_nvme_remove_cq(anv);
 		}
 
-		if (shutdown)
-			nvme_shutdown_ctrl(&anv->ctrl);
-		else
-			nvme_disable_ctrl(&anv->ctrl);
+		nvme_disable_ctrl(&anv->ctrl, shutdown);
 	}
 
 	WRITE_ONCE(anv->ioq.enabled, false);

drivers/nvme/host/core.c

@@ -2279,23 +2279,25 @@ static int nvme_wait_ready(struct nvme_ctrl *ctrl, u32 mask, u32 val,
 	return ret;
 }
 
-/*
- * If the device has been passed off to us in an enabled state, just clear
- * the enabled bit.  The spec says we should set the 'shutdown notification
- * bits', but doing so may cause the device to complete commands to the
- * admin queue ... and we don't know what memory that might be pointing at!
- */
-int nvme_disable_ctrl(struct nvme_ctrl *ctrl)
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, bool shutdown)
 {
 	int ret;
 
 	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
-	ctrl->ctrl_config &= ~NVME_CC_ENABLE;
+	if (shutdown)
+		ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
+	else
+		ctrl->ctrl_config &= ~NVME_CC_ENABLE;
 
 	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
 	if (ret)
 		return ret;
 
+	if (shutdown) {
+		return nvme_wait_ready(ctrl, NVME_CSTS_SHST_MASK,
+				       NVME_CSTS_SHST_CMPLT,
+				       ctrl->shutdown_timeout, "shutdown");
+	}
 	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
 		msleep(NVME_QUIRK_DELAY_AMOUNT);
 	return nvme_wait_ready(ctrl, NVME_CSTS_RDY, 0,
@@ -2369,21 +2371,6 @@ int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
 
-int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
-{
-	int ret;
-
-	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
-	ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
-
-	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
-	if (ret)
-		return ret;
-	return nvme_wait_ready(ctrl, NVME_CSTS_SHST_MASK, NVME_CSTS_SHST_CMPLT,
-			       ctrl->shutdown_timeout, "shutdown");
-}
-EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
-
 static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
 {
 	__le64 ts;

drivers/nvme/host/fc.c

@@ -2518,7 +2518,7 @@ __nvme_fc_abort_outstanding_ios(struct nvme_fc_ctrl *ctrl, bool start_queues)
 	 * Other transports, which don't have link-level contexts bound
 	 * to sqe's, would try to gracefully shutdown the controller by
 	 * writing the registers for shutdown and polling (call
-	 * nvme_shutdown_ctrl()). Given a bunch of i/o was potentially
+	 * nvme_disable_ctrl()). Given a bunch of i/o was potentially
 	 * just aborted and we will wait on those contexts, and given
 	 * there was no indication of how live the controlelr is on the
 	 * link, don't send more io to create more contexts for the

drivers/nvme/host/nvme.h

@@ -733,9 +733,8 @@ void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
 void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		enum nvme_ctrl_state new_state);
-int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, bool shutdown);
 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
-int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		const struct nvme_ctrl_ops *ops, unsigned long quirks);
 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);

drivers/nvme/host/pci.c

@@ -1500,11 +1500,7 @@ static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
 {
 	struct nvme_queue *nvmeq = &dev->queues[0];
 
-	if (shutdown)
-		nvme_shutdown_ctrl(&dev->ctrl);
-	else
-		nvme_disable_ctrl(&dev->ctrl);
-
+	nvme_disable_ctrl(&dev->ctrl, shutdown);
 	nvme_poll_irqdisable(nvmeq);
 }
 
@@ -1819,7 +1815,14 @@ static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
 	    (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
 		writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
 
-	result = nvme_disable_ctrl(&dev->ctrl);
+	/*
+	 * If the device has been passed off to us in an enabled state, just
+	 * clear the enabled bit.  The spec says we should set the 'shutdown
+	 * notification bits', but doing so may cause the device to complete
+	 * commands to the admin queue ... and we don't know what memory that
+	 * might be pointing at!
+	 */
+	result = nvme_disable_ctrl(&dev->ctrl, false);
 	if (result < 0)
 		return result;
 

drivers/nvme/host/rdma.c

@@ -2208,10 +2208,7 @@ static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 {
 	nvme_rdma_teardown_io_queues(ctrl, shutdown);
 	nvme_quiesce_admin_queue(&ctrl->ctrl);
-	if (shutdown)
-		nvme_shutdown_ctrl(&ctrl->ctrl);
-	else
-		nvme_disable_ctrl(&ctrl->ctrl);
+	nvme_disable_ctrl(&ctrl->ctrl, shutdown);
 	nvme_rdma_teardown_admin_queue(ctrl, shutdown);
 }
 

drivers/nvme/host/tcp.c

@@ -2142,10 +2142,7 @@ static void nvme_tcp_teardown_ctrl(struct nvme_ctrl *ctrl, bool shutdown)
 {
 	nvme_tcp_teardown_io_queues(ctrl, shutdown);
 	nvme_quiesce_admin_queue(ctrl);
-	if (shutdown)
-		nvme_shutdown_ctrl(ctrl);
-	else
-		nvme_disable_ctrl(ctrl);
+	nvme_disable_ctrl(ctrl, shutdown);
 	nvme_tcp_teardown_admin_queue(ctrl, shutdown);
 }
 

drivers/nvme/target/loop.c

@@ -401,7 +401,7 @@ static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
 
 	nvme_quiesce_admin_queue(&ctrl->ctrl);
 	if (ctrl->ctrl.state == NVME_CTRL_LIVE)
-		nvme_shutdown_ctrl(&ctrl->ctrl);
+		nvme_disable_ctrl(&ctrl->ctrl, true);
 
 	nvme_cancel_admin_tagset(&ctrl->ctrl);
 	nvme_loop_destroy_admin_queue(ctrl);