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nvme: paring quiesce/unquiesce 

The current blk_mq_quiesce_queue() and blk_mq_unquiesce_queue() always
stops and starts the queue unconditionally. And there can be concurrent
quiesce/unquiesce coming from different unrelated code paths, so
unquiesce may come unexpectedly and start queue too early.

Prepare for supporting concurrent quiesce/unquiesce from multiple
contexts, so that we can address the above issue.

NVMe has very complicated quiesce/unquiesce use pattern, add one atomic
bit for makeiing sure that blk-mq quiece/unquiesce is always called in
pair.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211014081710.1871747-5-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-10-14 16:17:08 +08:00 committed by Jens Axboe
parent ebc9b95260
commit 9e6a6b1212
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/nvme/host/core.c
View File

@ -4468,12 +4468,14 @@ EXPORT_SYMBOL_GPL(nvme_init_ctrl);
static void nvme_start_ns_queue(struct nvme_ns *ns)
{
blk_mq_unquiesce_queue(ns->queue);
if (test_and_clear_bit(NVME_NS_STOPPED, &ns->flags))
blk_mq_unquiesce_queue(ns->queue);
}
static void nvme_stop_ns_queue(struct nvme_ns *ns)
{
blk_mq_quiesce_queue(ns->queue);
if (!test_and_set_bit(NVME_NS_STOPPED, &ns->flags))
blk_mq_quiesce_queue(ns->queue);
}
/*
@ -4591,13 +4593,15 @@ EXPORT_SYMBOL_GPL(nvme_start_queues);
void nvme_stop_admin_queue(struct nvme_ctrl *ctrl)
{
blk_mq_quiesce_queue(ctrl->admin_q);
if (!test_and_set_bit(NVME_CTRL_ADMIN_Q_STOPPED, &ctrl->flags))
blk_mq_quiesce_queue(ctrl->admin_q);
}
EXPORT_SYMBOL_GPL(nvme_stop_admin_queue);
void nvme_start_admin_queue(struct nvme_ctrl *ctrl)
{
blk_mq_unquiesce_queue(ctrl->admin_q);
if (test_and_clear_bit(NVME_CTRL_ADMIN_Q_STOPPED, &ctrl->flags))
blk_mq_unquiesce_queue(ctrl->admin_q);
}
EXPORT_SYMBOL_GPL(nvme_start_admin_queue);

2
drivers/nvme/host/nvme.h
View File

@ -342,6 +342,7 @@ struct nvme_ctrl {
int nr_reconnects;
unsigned long flags;
#define NVME_CTRL_FAILFAST_EXPIRED 0
#define NVME_CTRL_ADMIN_Q_STOPPED 1
struct nvmf_ctrl_options *opts;
struct page *discard_page;
@ -463,6 +464,7 @@ struct nvme_ns {
#define NVME_NS_ANA_PENDING 2
#define NVME_NS_FORCE_RO 3
#define NVME_NS_READY 4
#define NVME_NS_STOPPED 5
struct cdev cdev;
struct device cdev_device;