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 <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>
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index e79e9f1..1f5b692 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -11,6 +11,7 @@
#include "blk.h"
#include "blk-mq.h"
+#include "blk-mq-debugfs.h"
#include "blk-mq-sched.h"
#include "blk-mq-tag.h"
#include "blk-wbt.h"
@@ -472,6 +473,8 @@ int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
}
}
+ blk_mq_debugfs_register_sched_hctx(q, hctx);
+
return 0;
}
@@ -483,6 +486,8 @@ void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
if (!e)
return;
+ blk_mq_debugfs_unregister_sched_hctx(hctx);
+
if (e->type->ops.mq.exit_hctx && hctx->sched_data) {
e->type->ops.mq.exit_hctx(hctx, hctx_idx);
hctx->sched_data = NULL;
@@ -519,8 +524,10 @@ int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
if (ret)
goto err;
- if (e->ops.mq.init_hctx) {
- queue_for_each_hw_ctx(q, hctx, i) {
+ blk_mq_debugfs_register_sched(q);
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ if (e->ops.mq.init_hctx) {
ret = e->ops.mq.init_hctx(hctx, i);
if (ret) {
eq = q->elevator;
@@ -529,6 +536,7 @@ int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
return ret;
}
}
+ blk_mq_debugfs_register_sched_hctx(q, hctx);
}
return 0;
@@ -544,14 +552,14 @@ void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e)
struct blk_mq_hw_ctx *hctx;
unsigned int i;
- if (e->type->ops.mq.exit_hctx) {
- queue_for_each_hw_ctx(q, hctx, i) {
- if (hctx->sched_data) {
- e->type->ops.mq.exit_hctx(hctx, i);
- hctx->sched_data = NULL;
- }
+ queue_for_each_hw_ctx(q, hctx, i) {
+ blk_mq_debugfs_unregister_sched_hctx(hctx);
+ if (e->type->ops.mq.exit_hctx && hctx->sched_data) {
+ e->type->ops.mq.exit_hctx(hctx, i);
+ hctx->sched_data = NULL;
}
}
+ blk_mq_debugfs_unregister_sched(q);
if (e->type->ops.mq.exit_sched)
e->type->ops.mq.exit_sched(e);
blk_mq_sched_tags_teardown(q);