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blk-mq-debugfs: allow schedulers to register debugfs attributes

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This provides the infrastructure for schedulers to expose their internal
state through debugfs. We add a list of queue attributes and a list of
hctx attributes to struct elevator_type and wire them up when switching
schedulers.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>

Add missing seq_file.h header in blk-mq-debugfs.h

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval
2017-05-04 08:24:40 -06:00
committed by Jens Axboe
parent 9c1051aacd
commit d332ce0918
6 changed files with 127 additions and 17 deletions
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7
include/linux/elevator.h
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@@ -8,6 +8,9 @@
struct io_cq;
struct elevator_type;
#ifdef CONFIG_BLK_DEBUG_FS
struct blk_mq_debugfs_attr;
#endif
/*
* Return values from elevator merger
@@ -144,6 +147,10 @@ struct elevator_type
char elevator_name[ELV_NAME_MAX];
struct module *elevator_owner;
bool uses_mq;
#ifdef CONFIG_BLK_DEBUG_FS
const struct blk_mq_debugfs_attr *queue_debugfs_attrs;
const struct blk_mq_debugfs_attr *hctx_debugfs_attrs;
#endif
/* managed by elevator core */
char icq_cache_name[ELV_NAME_MAX + 5]; /* elvname + "_io_cq" */