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-rw-r--r--block/blk-mq-sched.c78
1 files changed, 4 insertions, 74 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index df8581bb0a37..daab27feb653 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -68,25 +68,17 @@ static void blk_mq_sched_mark_restart_hctx(struct blk_mq_hw_ctx *hctx)
set_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
}
-static bool blk_mq_sched_restart_hctx(struct blk_mq_hw_ctx *hctx)
+void blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
{
if (!test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
- return false;
-
- if (hctx->flags & BLK_MQ_F_TAG_SHARED) {
- struct request_queue *q = hctx->queue;
+ return;
- if (test_and_clear_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state))
- atomic_dec(&q->shared_hctx_restart);
- } else
- clear_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
+ clear_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state);
if (blk_mq_hctx_has_pending(hctx)) {
blk_mq_run_hw_queue(hctx, true);
- return true;
+ return;
}
-
- return false;
}
/* return true if hctx need to run again */
@@ -385,68 +377,6 @@ static bool blk_mq_sched_bypass_insert(struct blk_mq_hw_ctx *hctx,
return true;
}
-/**
- * list_for_each_entry_rcu_rr - iterate in a round-robin fashion over rcu list
- * @pos: loop cursor.
- * @skip: the list element that will not be examined. Iteration starts at
- * @skip->next.
- * @head: head of the list to examine. This list must have at least one
- * element, namely @skip.
- * @member: name of the list_head structure within typeof(*pos).
- */
-#define list_for_each_entry_rcu_rr(pos, skip, head, member) \
- for ((pos) = (skip); \
- (pos = (pos)->member.next != (head) ? list_entry_rcu( \
- (pos)->member.next, typeof(*pos), member) : \
- list_entry_rcu((pos)->member.next->next, typeof(*pos), member)), \
- (pos) != (skip); )
-
-/*
- * Called after a driver tag has been freed to check whether a hctx needs to
- * be restarted. Restarts @hctx if its tag set is not shared. Restarts hardware
- * queues in a round-robin fashion if the tag set of @hctx is shared with other
- * hardware queues.
- */
-void blk_mq_sched_restart(struct blk_mq_hw_ctx *const hctx)
-{
- struct blk_mq_tags *const tags = hctx->tags;
- struct blk_mq_tag_set *const set = hctx->queue->tag_set;
- struct request_queue *const queue = hctx->queue, *q;
- struct blk_mq_hw_ctx *hctx2;
- unsigned int i, j;
-
- if (set->flags & BLK_MQ_F_TAG_SHARED) {
- /*
- * If this is 0, then we know that no hardware queues
- * have RESTART marked. We're done.
- */
- if (!atomic_read(&queue->shared_hctx_restart))
- return;
-
- rcu_read_lock();
- list_for_each_entry_rcu_rr(q, queue, &set->tag_list,
- tag_set_list) {
- queue_for_each_hw_ctx(q, hctx2, i)
- if (hctx2->tags == tags &&
- blk_mq_sched_restart_hctx(hctx2))
- goto done;
- }
- j = hctx->queue_num + 1;
- for (i = 0; i < queue->nr_hw_queues; i++, j++) {
- if (j == queue->nr_hw_queues)
- j = 0;
- hctx2 = queue->queue_hw_ctx[j];
- if (hctx2->tags == tags &&
- blk_mq_sched_restart_hctx(hctx2))
- break;
- }
-done:
- rcu_read_unlock();
- } else {
- blk_mq_sched_restart_hctx(hctx);
- }
-}
-
/*
* Add flush/fua to the queue. If we fail getting a driver tag, then
* punt to the requeue list. Requeue will re-invoke us from a context