From: Omar Sandoval <osandov@xxxxxx>
These can be used to debug issues like tag leaks and stuck requests.
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
block/blk-mq-debugfs.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 48b3a11402fb..9f43b285fe3a 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -191,6 +191,30 @@ static const struct file_operations hctx_tags_fops = {
.release = single_release,
};
+static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+ struct request_queue *q = hctx->queue;
+
+ mutex_lock(&q->sysfs_lock);
+ if (hctx->tags)
+ sbitmap_bitmap_show(m, &hctx->tags->bitmap_tags.sb);
+ mutex_unlock(&q->sysfs_lock);
+ return 0;
+}
+
+static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hctx_tags_bitmap_show, inode->i_private);
+}
+
+static const struct file_operations hctx_tags_bitmap_fops = {
+ .open = hctx_tags_bitmap_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int hctx_sched_tags_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
@@ -216,6 +240,30 @@ static const struct file_operations hctx_sched_tags_fops = {
.release = single_release,
};
+static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+ struct request_queue *q = hctx->queue;
+
+ mutex_lock(&q->sysfs_lock);
+ if (hctx->sched_tags)
+ sbitmap_bitmap_show(m, &hctx->sched_tags->bitmap_tags.sb);
+ mutex_unlock(&q->sysfs_lock);
+ return 0;
+}
+
+static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
+}
+
+static const struct file_operations hctx_sched_tags_bitmap_fops = {
+ .open = hctx_sched_tags_bitmap_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
{
struct blk_mq_ctx *ctx = m->private;
@@ -263,7 +311,9 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
{"dispatch", 0400, &hctx_dispatch_fops},
{"ctx_map", 0400, &hctx_ctx_map_fops},
{"tags", 0400, &hctx_tags_fops},
+ {"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
{"sched_tags", 0400, &hctx_sched_tags_fops},
+ {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
--
2.11.0
--
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