diff options
| author | Jens Axboe <axboe@kernel.dk> | 2018-10-30 19:36:06 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-07 23:44:59 +0300 |
| commit | b3c661b15d5ab11d982e58bee23e05c1780528a1 (patch) | |
| tree | d9976237d4749482b7948282a1cc08e2e27767d3 /include/linux/blk-mq.h | |
| parent | a783b81820fe3532809c98371ec904dfdb0ea9e5 (diff) | |
| download | linux-b3c661b15d5ab11d982e58bee23e05c1780528a1.tar.xz | |
blk-mq: support multiple hctx maps
Add support for the tag set carrying multiple queue maps, and
for the driver to inform blk-mq how many it wishes to support
through setting set->nr_maps.
This adds an mq_ops helper for drivers that support more than 1
map, mq_ops->rq_flags_to_type(). The function takes request/bio
flags and CPU, and returns a queue map index for that. We then
use the type information in blk_mq_map_queue() to index the map
set.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 6c39d546c50b..8994c95056a8 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -85,7 +85,14 @@ enum { }; struct blk_mq_tag_set { + /* + * map[] holds ctx -> hctx mappings, one map exists for each type + * that the driver wishes to support. There are no restrictions + * on maps being of the same size, and it's perfectly legal to + * share maps between types. + */ struct blk_mq_queue_map map[HCTX_MAX_TYPES]; + unsigned int nr_maps; /* nr entries in map[] */ const struct blk_mq_ops *ops; unsigned int nr_hw_queues; /* nr hw queues across maps */ unsigned int queue_depth; /* max hw supported */ @@ -109,6 +116,8 @@ struct blk_mq_queue_data { typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *); +/* takes rq->cmd_flags as input, returns a hardware type index */ +typedef int (rq_flags_to_type_fn)(struct request_queue *, unsigned int); typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *); typedef void (put_budget_fn)(struct blk_mq_hw_ctx *); typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool); @@ -135,6 +144,11 @@ struct blk_mq_ops { queue_rq_fn *queue_rq; /* + * Return a queue map type for the given request/bio flags + */ + rq_flags_to_type_fn *rq_flags_to_type; + + /* * Reserve budget before queue request, once .queue_rq is * run, it is driver's responsibility to release the * reserved budget. Also we have to handle failure case |