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blk-mq: create debugfs directory tree

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In preparation for putting blk-mq debugging information in debugfs,
create a directory tree mirroring the one in sysfs:

    # tree -d /sys/kernel/debug/block
    /sys/kernel/debug/block
    |-- nvme0n1
    |   `-- mq
    |       |-- 0
    |       |   `-- cpu0
    |       |-- 1
    |       |   `-- cpu1
    |       |-- 2
    |       |   `-- cpu2
    |       `-- 3
    |           `-- cpu3
    `-- vda
        `-- mq
            `-- 0
                |-- cpu0
                |-- cpu1
                |-- cpu2
                `-- cpu3

Also add the scaffolding for the actual files that will go in here,
either under the hardware queue or software queue directories.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval
2017-01-25 08:06:40 -08:00
committed by Jens Axboe
parent b48fda0976
commit 07e4fead45
6 changed files with 201 additions and 0 deletions
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5
include/linux/blkdev.h
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@@ -571,6 +571,11 @@ struct request_queue {
struct list_head tag_set_list;
struct bio_set *bio_split;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_dir;
struct dentry *mq_debugfs_dir;
#endif
bool mq_sysfs_init_done;
};