diff mbox series

[RFC,1/3] block/mq: add iterator for polling hw queues

Message ID 20201020065420.124885-2-jefflexu@linux.alibaba.com (mailing list archive)
State Changes Requested, archived
Delegated to: Mike Snitzer
Headers show
Series Add support of iopoll for dm device | expand

Commit Message

Jingbo Xu Oct. 20, 2020, 6:54 a.m. UTC 
Add one helper function for iterating all hardware queues in polling
mode.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 include/linux/blk-mq.h | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index b23eeca4d677..81c70ce97715 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -571,6 +571,12 @@  static inline void *blk_mq_rq_to_pdu(struct request *rq)
 	for ((i) = 0; (i) < (q)->nr_hw_queues &&			\
 	     ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
 
+#define queue_for_each_poll_hw_ctx(q, hctx, i)				\
+	for ((i) = 0; ((q)->tag_set->nr_maps > HCTX_TYPE_POLL) &&	\
+	     (i) < (q)->tag_set->map[HCTX_TYPE_POLL].nr_queues &&	\
+	     ({ hctx = (q)->queue_hw_ctx[((q)->tag_set->map[HCTX_TYPE_POLL].queue_offset + (i))]; 1; }); \
+	     (i)++)
+
 #define hctx_for_each_ctx(hctx, ctx, i)					\
 	for ((i) = 0; (i) < (hctx)->nr_ctx &&				\
 	     ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)