blk-mq-debugfs: Add 'kick' operation

Running a queue causes the block layer to examine the per-CPU and
hw queues but not the requeue list. Hence add a 'kick' operation
that also examines the requeue list.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Eduardo Valentin <eduval@amazon.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 90c454bbaf925d9cc203ac984e5edb700219c97a..9edebbdce0bdfc22ee9ba8319bb3cc58923bbfa7 100644 (file)
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -114,10 +114,12 @@ static ssize_t queue_state_write(void *data, const char __user *buf,
                blk_mq_run_hw_queues(q, true);
        } else if (strcmp(op, "start") == 0) {
                blk_mq_start_stopped_hw_queues(q, true);
+       } else if (strcmp(op, "kick") == 0) {
+               blk_mq_kick_requeue_list(q);
        } else {
                pr_err("%s: unsupported operation '%s'\n", __func__, op);
 inval:
-               pr_err("%s: use either 'run' or 'start'\n", __func__);
+               pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
                return -EINVAL;
        }
        return count;