[PATCH 07/14] nvme: split nvme_kill_queues

Christoph Hellwig
2022-11-01T15:01:40Z

nvme_kill_queues does two things:

1) mark the gendisk of all namespaces dead
2) unquiesce all I/O queues

These used to be be intertwined due to block layer issues, but aren't
any more. So move the unquiscing of the I/O queues into the callers,
and rename the rest of the function to the now more descriptive
nvme_mark_namespaces_dead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
drivers/nvme/host/apple.c | 3 ++-
drivers/nvme/host/core.c | 36 ++++++++----------------------------
drivers/nvme/host/nvme.h | 3 +--
drivers/nvme/host/pci.c | 6 ++++--
4 files changed, 15 insertions(+), 33 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index a89b06a7099f1..6c09703ffe922 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1153,7 +1153,8 @@ static void apple_nvme_reset_work(struct work_struct *work)
nvme_change_ctrl_state(&anv->ctrl, NVME_CTRL_DELETING);
nvme_get_ctrl(&anv->ctrl);
apple_nvme_disable(anv, false);
- nvme_kill_queues(&anv->ctrl);
+ nvme_mark_namespaces_dead(&anv->ctrl);
+ nvme_start_queues(&anv->ctrl);
if (!queue_work(nvme_wq, &anv->remove_work))
nvme_put_ctrl(&anv->ctrl);
}
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index bb62803de5b21..ed06fcb87f93a 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4561,8 +4561,10 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
* removing the namespaces' disks; fail all the queues now to avoid
* potentially having to clean up the failed sync later.
*/
- if (ctrl->state == NVME_CTRL_DEAD)
- nvme_kill_queues(ctrl);
+ if (ctrl->state == NVME_CTRL_DEAD) {
+ nvme_mark_namespaces_dead(ctrl);
+ nvme_start_queues(ctrl);
+ }

/* this is a no-op when called from the controller reset handler */
nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING_NOIO);
@@ -5108,39 +5110,17 @@ static void nvme_stop_ns_queue(struct nvme_ns *ns)
blk_mq_wait_quiesce_done(ns->queue);
}

-/*
- * Prepare a queue for teardown.
- *
- * This must forcibly unquiesce queues to avoid blocking dispatch.
- */
-static void nvme_set_queue_dying(struct nvme_ns *ns)
-{
- if (test_and_set_bit(NVME_NS_DEAD, &ns->flags))
- return;
-
- blk_mark_disk_dead(ns->disk);
- nvme_start_ns_queue(ns);
-}
-
-/**
- * nvme_kill_queues(): Ends all namespace queues
- * @ctrl: the dead controller that needs to end
- *
- * Call this function when the driver determines it is unable to get the
- * controller in a state capable of servicing IO.
- */
-void nvme_kill_queues(struct nvme_ctrl *ctrl)
+/* let I/O to all namespaces fail in preparation for surprise removal */
+void nvme_mark_namespaces_dead(struct nvme_ctrl *ctrl)
{
struct nvme_ns *ns;

down_read(&ctrl->namespaces_rwsem);
-
list_for_each_entry(ns, &ctrl->namespaces, list)
- nvme_set_queue_dying(ns);
-
+ blk_mark_disk_dead(ns->disk);
up_read(&ctrl->namespaces_rwsem);
}
-EXPORT_SYMBOL_GPL(nvme_kill_queues);
+EXPORT_SYMBOL_GPL(nvme_mark_namespaces_dead);

void nvme_unfreeze(struct nvme_ctrl *ctrl)
{
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index a29877217ee65..1cd7168002438 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -483,7 +483,6 @@ struct nvme_ns {
unsigned long features;
unsigned long flags;
#define NVME_NS_REMOVING 0
-#define NVME_NS_DEAD 1
#define NVME_NS_ANA_PENDING 2
#define NVME_NS_FORCE_RO 3
#define NVME_NS_READY 4
@@ -758,7 +757,7 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl);
void nvme_start_queues(struct nvme_ctrl *ctrl);
void nvme_stop_admin_queue(struct nvme_ctrl *ctrl);
void nvme_start_admin_queue(struct nvme_ctrl *ctrl);
-void nvme_kill_queues(struct nvme_ctrl *ctrl);
+void nvme_mark_namespaces_dead(struct nvme_ctrl *ctrl);
void nvme_sync_queues(struct nvme_ctrl *ctrl);
void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
void nvme_unfreeze(struct nvme_ctrl *ctrl);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 0e8410edb41bf..046fc02914a5a 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2788,7 +2788,8 @@ static void nvme_remove_dead_ctrl(struct nvme_dev *dev)
nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);
nvme_get_ctrl(&dev->ctrl);
nvme_dev_disable(dev, false);
- nvme_kill_queues(&dev->ctrl);
+ nvme_mark_namespaces_dead(&dev->ctrl);
+ nvme_start_queues(&dev->ctrl);
if (!queue_work(nvme_wq, &dev->remove_work))
nvme_put_ctrl(&dev->ctrl);
}
@@ -2913,7 +2914,8 @@ static void nvme_reset_work(struct work_struct *work)
nvme_unfreeze(&dev->ctrl);
} else {
dev_warn(dev->ctrl.device, "IO queues lost\n");
- nvme_kill_queues(&dev->ctrl);
+ nvme_mark_namespaces_dead(&dev->ctrl);
+ nvme_start_queues(&dev->ctrl);
nvme_remove_namespaces(&dev->ctrl);
nvme_free_tagset(dev);
}
--
2.30.2