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authorJens Axboe <axboe@fb.com>2016-11-04 09:34:34 -0600
committerJens Axboe <axboe@fb.com>2016-11-11 13:40:25 -0700
commitbbd7bb7017d5c2b1e75f3818b4ce88fa58bb0eab (patch)
tree5a025d557bb82df1b27a209e924b0941f2c42aaa /block
parentb425b0201e89e6509032985532a33f1f92ac62a6 (diff)
downloadlinux-0-day-bbd7bb7017d5c2b1e75f3818b4ce88fa58bb0eab.tar.gz
block: move poll code to blk-mq
The poll code is blk-mq specific, let's move it to blk-mq.c. This is a prep patch for improving the polling code. Signed-off-by: Jens Axboe <axboe@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c46
-rw-r--r--block/blk-mq.c54
2 files changed, 54 insertions, 46 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 59f8129..eea2465 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -3312,52 +3312,6 @@ void blk_finish_plug(struct blk_plug *plug)
}
EXPORT_SYMBOL(blk_finish_plug);
-bool blk_poll(struct request_queue *q, blk_qc_t cookie)
-{
- struct blk_plug *plug;
- long state;
- unsigned int queue_num;
- struct blk_mq_hw_ctx *hctx;
-
- if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) ||
- !test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
- return false;
-
- queue_num = blk_qc_t_to_queue_num(cookie);
- hctx = q->queue_hw_ctx[queue_num];
- hctx->poll_considered++;
-
- plug = current->plug;
- if (plug)
- blk_flush_plug_list(plug, false);
-
- state = current->state;
- while (!need_resched()) {
- int ret;
-
- hctx->poll_invoked++;
-
- ret = q->mq_ops->poll(hctx, blk_qc_t_to_tag(cookie));
- if (ret > 0) {
- hctx->poll_success++;
- set_current_state(TASK_RUNNING);
- return true;
- }
-
- if (signal_pending_state(state, current))
- set_current_state(TASK_RUNNING);
-
- if (current->state == TASK_RUNNING)
- return true;
- if (ret < 0)
- break;
- cpu_relax();
- }
-
- return false;
-}
-EXPORT_SYMBOL_GPL(blk_poll);
-
#ifdef CONFIG_PM
/**
* blk_pm_runtime_init - Block layer runtime PM initialization routine
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 77110ae..ae8df5e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2461,6 +2461,60 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues)
}
EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues);
+static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq)
+{
+ struct request_queue *q = hctx->queue;
+ long state;
+
+ hctx->poll_considered++;
+
+ state = current->state;
+ while (!need_resched()) {
+ int ret;
+
+ hctx->poll_invoked++;
+
+ ret = q->mq_ops->poll(hctx, rq->tag);
+ if (ret > 0) {
+ hctx->poll_success++;
+ set_current_state(TASK_RUNNING);
+ return true;
+ }
+
+ if (signal_pending_state(state, current))
+ set_current_state(TASK_RUNNING);
+
+ if (current->state == TASK_RUNNING)
+ return true;
+ if (ret < 0)
+ break;
+ cpu_relax();
+ }
+
+ return false;
+}
+
+bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie)
+{
+ struct blk_mq_hw_ctx *hctx;
+ struct blk_plug *plug;
+ struct request *rq;
+
+ if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) ||
+ !test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
+ return false;
+
+ plug = current->plug;
+ if (plug)
+ blk_flush_plug_list(plug, false);
+
+ hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)];
+ rq = blk_mq_tag_to_rq(hctx->tags, blk_qc_t_to_tag(cookie));
+
+ return __blk_mq_poll(hctx, rq);
+}
+EXPORT_SYMBOL_GPL(blk_mq_poll);
+
void blk_mq_disable_hotplug(void)
{
mutex_lock(&all_q_mutex);