Add a new hw queue state of BLK_MQ_S_INACTIVE, which is set when all
CPUs of this hctx are offline.
Prepares for stopping hw queue when all CPUs of this hctx become offline.
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/blk-mq-debugfs.c | 1 +
block/blk-mq.h | 3 ++-
include/linux/blk-mq.h | 3 +++
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index b3f2ba483992..d6de4f7f38cb 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -213,6 +213,7 @@ static const char *const hctx_state_name[] = {
HCTX_STATE_NAME(STOPPED),
HCTX_STATE_NAME(TAG_ACTIVE),
HCTX_STATE_NAME(SCHED_RESTART),
+ HCTX_STATE_NAME(INACTIVE),
};
#undef HCTX_STATE_NAME
diff --git a/block/blk-mq.h b/block/blk-mq.h
index eaaca8fc1c28..fb5ea01f1366 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -167,7 +167,8 @@ static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data
static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
{
- return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
+ return test_bit(BLK_MQ_S_STOPPED, &hctx->state) ||
+ test_bit(BLK_MQ_S_INACTIVE, &hctx->state);
}
static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 11cfd6470b1a..b669e776d4cb 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -397,6 +397,9 @@ enum {
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
+ /* hw queue is inactive after all its CPUs become offline */
+ BLK_MQ_S_INACTIVE = 3,
+
BLK_MQ_MAX_DEPTH = 10240,
BLK_MQ_CPU_WORK_BATCH = 8,
--
2.20.1
