blk-mq-debugfs: support rq_qos

blk-mq-debugfs has been proved as very helpful for debug some
tough issues, such as IO hang.

We have seen blk-wbt related IO hang several times, even inside
Red Hat BZ, there is such report not sovled yet, so this patch
adds support debugfs on rq_qos.

Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

5 files changed, 98 insertions, 0 deletions

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index a32bb79d6c95..2793e91bc7a4 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -23,6 +23,7 @@
 #include "blk-mq.h"
 #include "blk-mq-debugfs.h"
 #include "blk-mq-tag.h"
+#include "blk-rq-qos.h"
 
 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
 {
@@ -856,6 +857,15 @@ int blk_mq_debugfs_register(struct request_queue *q)
                         goto err;
         }
 
+        if (q->rq_qos) {
+                struct rq_qos *rqos = q->rq_qos;
+
+                while (rqos) {
+                        blk_mq_debugfs_register_rqos(rqos);
+                        rqos = rqos->next;
+                }
+        }
+
         return 0;
 
 err:
@@ -978,6 +988,50 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q)
         q->sched_debugfs_dir = NULL;
 }
 
+void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
+{
+        debugfs_remove_recursive(rqos->debugfs_dir);
+        rqos->debugfs_dir = NULL;
+}
+
+int blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
+{
+        struct request_queue *q = rqos->q;
+        const char *dir_name = rq_qos_id_to_name(rqos->id);
+
+        if (!q->debugfs_dir)
+                return -ENOENT;
+
+        if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
+                return 0;
+
+        if (!q->rqos_debugfs_dir) {
+                q->rqos_debugfs_dir = debugfs_create_dir("rqos",
+                                                         q->debugfs_dir);
+                if (!q->rqos_debugfs_dir)
+                        return -ENOMEM;
+        }
+
+        rqos->debugfs_dir = debugfs_create_dir(dir_name,
+                                               rqos->q->rqos_debugfs_dir);
+        if (!rqos->debugfs_dir)
+                return -ENOMEM;
+
+        if (!debugfs_create_files(rqos->debugfs_dir, rqos,
+                                  rqos->ops->debugfs_attrs))
+                goto err;
+        return 0;
+ err:
+        blk_mq_debugfs_unregister_rqos(rqos);
+        return -ENOMEM;
+}
+
+void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
+{
+        debugfs_remove_recursive(q->rqos_debugfs_dir);
+        q->rqos_debugfs_dir = NULL;
+}
+
 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
                                        struct blk_mq_hw_ctx *hctx)
 {
diff --git a/block/blk-mq-debugfs.h b/block/blk-mq-debugfs.h
index a9160be12be0..8c9012a578c1 100644
--- a/block/blk-mq-debugfs.h
+++ b/block/blk-mq-debugfs.h
@@ -31,6 +31,10 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q);
 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
                                        struct blk_mq_hw_ctx *hctx);
 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx);
+
+int blk_mq_debugfs_register_rqos(struct rq_qos *rqos);
+void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos);
+void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q);
 #else
 static inline int blk_mq_debugfs_register(struct request_queue *q)
 {
@@ -78,6 +82,19 @@ static inline int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
 static inline void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
 {
 }
+
+static inline int blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
+{
+        return 0;
+}
+
+static inline void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
+{
+}
+
+static inline void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
+{
+}
 #endif
 
 #ifdef CONFIG_BLK_DEBUG_FS_ZONED
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index e932ef9d2718..d169d7188fa6 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -264,6 +264,8 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
 
 void rq_qos_exit(struct request_queue *q)
 {
+        blk_mq_debugfs_unregister_queue_rqos(q);
+
         while (q->rq_qos) {
                 struct rq_qos *rqos = q->rq_qos;
                 q->rq_qos = rqos->next;
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 8678875de420..3c85f26d3846 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -7,6 +7,10 @@
 #include <linux/atomic.h>
 #include <linux/wait.h>
 
+#include "blk-mq-debugfs.h"
+
+struct blk_mq_debugfs_attr;
+
 enum rq_qos_id {
         RQ_QOS_WBT,
         RQ_QOS_CGROUP,
@@ -22,6 +26,9 @@ struct rq_qos {
         struct request_queue *q;
         enum rq_qos_id id;
         struct rq_qos *next;
+#ifdef CONFIG_BLK_DEBUG_FS
+        struct dentry *debugfs_dir;
+#endif
 };
 
 struct rq_qos_ops {
@@ -33,6 +40,7 @@ struct rq_qos_ops {
         void (*done_bio)(struct rq_qos *, struct bio *);
         void (*cleanup)(struct rq_qos *, struct bio *);
         void (*exit)(struct rq_qos *);
+        const struct blk_mq_debugfs_attr *debugfs_attrs;
 };
 
 struct rq_depth {
@@ -66,6 +74,17 @@ static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
         return rq_qos_id(q, RQ_QOS_CGROUP);
 }
 
+static inline const char *rq_qos_id_to_name(enum rq_qos_id id)
+{
+        switch (id) {
+        case RQ_QOS_WBT:
+                return "wbt";
+        case RQ_QOS_CGROUP:
+                return "cgroup";
+        }
+        return "unknown";
+}
+
 static inline void rq_wait_init(struct rq_wait *rq_wait)
 {
         atomic_set(&rq_wait->inflight, 0);
@@ -76,6 +95,9 @@ static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
 {
         rqos->next = q->rq_qos;
         q->rq_qos = rqos;
+
+        if (rqos->ops->debugfs_attrs)
+                blk_mq_debugfs_register_rqos(rqos);
 }
 
 static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
@@ -91,6 +113,8 @@ static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
                 }
                 prev = cur;
         }
+
+        blk_mq_debugfs_unregister_rqos(rqos);
 }
 
 typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 81f1b105946b..45552e6eae1e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -560,6 +560,7 @@ struct request_queue {
 #ifdef CONFIG_BLK_DEBUG_FS
         struct dentry           *debugfs_dir;
         struct dentry           *sched_debugfs_dir;
+        struct dentry           *rqos_debugfs_dir;
 #endif
 
         bool                    mq_sysfs_init_done;