From d332ce091813d11a46144354baa72b755833392f Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Thu, 4 May 2017 08:24:40 -0600 Subject: blk-mq-debugfs: allow schedulers to register debugfs attributes 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 Reviewed-by: Hannes Reinecke Add missing seq_file.h header in blk-mq-debugfs.h Signed-off-by: Jens Axboe --- block/blk-mq-debugfs.c | 74 ++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 65 insertions(+), 9 deletions(-) (limited to 'block/blk-mq-debugfs.c') diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 260cf76e0705d..a3b8871093104 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -24,15 +24,6 @@ #include "blk-mq-debugfs.h" #include "blk-mq-tag.h" -struct blk_mq_debugfs_attr { - const char *name; - umode_t mode; - int (*show)(void *, struct seq_file *); - ssize_t (*write)(void *, const char __user *, size_t, loff_t *); - /* Set either .show or .seq_ops. */ - const struct seq_operations *seq_ops; -}; - static int blk_flags_show(struct seq_file *m, const unsigned long flags, const char *const *flag_name, int flag_name_count) { @@ -725,6 +716,9 @@ int blk_mq_debugfs_register(struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) { if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) goto err; + if (q->elevator && !hctx->sched_debugfs_dir && + blk_mq_debugfs_register_sched_hctx(q, hctx)) + goto err; } return 0; @@ -737,6 +731,7 @@ err: void blk_mq_debugfs_unregister(struct request_queue *q) { debugfs_remove_recursive(q->debugfs_dir); + q->sched_debugfs_dir = NULL; q->debugfs_dir = NULL; } @@ -791,6 +786,7 @@ err: void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) { debugfs_remove_recursive(hctx->debugfs_dir); + hctx->sched_debugfs_dir = NULL; hctx->debugfs_dir = NULL; } @@ -815,3 +811,63 @@ void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) blk_mq_debugfs_unregister_hctx(hctx); } + +int blk_mq_debugfs_register_sched(struct request_queue *q) +{ + struct elevator_type *e = q->elevator->type; + + if (!q->debugfs_dir) + return -ENOENT; + + if (!e->queue_debugfs_attrs) + return 0; + + q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); + if (!q->sched_debugfs_dir) + return -ENOMEM; + + if (!debugfs_create_files(q->sched_debugfs_dir, q, + e->queue_debugfs_attrs)) + goto err; + + return 0; + +err: + blk_mq_debugfs_unregister_sched(q); + return -ENOMEM; +} + +void blk_mq_debugfs_unregister_sched(struct request_queue *q) +{ + debugfs_remove_recursive(q->sched_debugfs_dir); + q->sched_debugfs_dir = NULL; +} + +int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx) +{ + struct elevator_type *e = q->elevator->type; + + if (!hctx->debugfs_dir) + return -ENOENT; + + if (!e->hctx_debugfs_attrs) + return 0; + + hctx->sched_debugfs_dir = debugfs_create_dir("sched", + hctx->debugfs_dir); + if (!hctx->sched_debugfs_dir) + return -ENOMEM; + + if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, + e->hctx_debugfs_attrs)) + return -ENOMEM; + + return 0; +} + +void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) +{ + debugfs_remove_recursive(hctx->sched_debugfs_dir); + hctx->sched_debugfs_dir = NULL; +} -- cgit v1.2.3