block: move queues types to the block layer
Having another indirect all in the fast path doesn't really help
in our post-spectre world. Also having too many queue type is just
going to create confusion, so I'd rather manage them centrally.
Note that the queue type naming and ordering changes a bit - the
first index now is the default queue for everything not explicitly
marked, the optional ones are read and poll queues.
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 7291e53..a664ea4 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -81,16 +81,14 @@ extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
/*
* blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
* @q: request queue
- * @hctx_type: the hctx type index
+ * @type: the hctx type index
* @cpu: CPU
*/
static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
- unsigned int hctx_type,
+ enum hctx_type type,
unsigned int cpu)
{
- struct blk_mq_tag_set *set = q->tag_set;
-
- return q->queue_hw_ctx[set->map[hctx_type].mq_map[cpu]];
+ return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]];
}
/*
@@ -103,12 +101,17 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
unsigned int flags,
unsigned int cpu)
{
- int hctx_type = 0;
+ enum hctx_type type = HCTX_TYPE_DEFAULT;
- if (q->mq_ops->rq_flags_to_type)
- hctx_type = q->mq_ops->rq_flags_to_type(q, flags);
+ if (q->tag_set->nr_maps > HCTX_TYPE_POLL &&
+ ((flags & REQ_HIPRI) && test_bit(QUEUE_FLAG_POLL, &q->queue_flags)))
+ type = HCTX_TYPE_POLL;
- return blk_mq_map_queue_type(q, hctx_type, cpu);
+ else if (q->tag_set->nr_maps > HCTX_TYPE_READ &&
+ ((flags & REQ_OP_MASK) == REQ_OP_READ))
+ type = HCTX_TYPE_READ;
+
+ return blk_mq_map_queue_type(q, type, cpu);
}
/*
