From: Omar Sandoval <osandov@xxxxxx>
This is useful for debugging problems where we've gotten stuck with
requests in the software queues.
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
block/blk-mq-debugfs.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index ee947f2f605b..857bdadc6b1f 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -134,6 +134,26 @@ static const struct file_operations hctx_dispatch_fops = {
.release = seq_release,
};
+static int hctx_ctx_map_show(struct seq_file *m, void *v)
+{
+ struct blk_mq_hw_ctx *hctx = m->private;
+
+ sbitmap_bitmap_show(&hctx->ctx_map, m);
+ return 0;
+}
+
+static int hctx_ctx_map_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hctx_ctx_map_show, inode->i_private);
+}
+
+static const struct file_operations hctx_ctx_map_fops = {
+ .open = hctx_ctx_map_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;
@@ -179,6 +199,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
{"state", 0400, &hctx_state_fops},
{"flags", 0400, &hctx_flags_fops},
{"dispatch", 0400, &hctx_dispatch_fops},
+ {"ctx_map", 0400, &hctx_ctx_map_fops},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
--
2.11.0
--
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