blk-mq: add hctx->{state,flags} to debugfs

hctx->state could come in handy for bugs where the hardware queue gets
stuck in the stopped state, and hctx->flags is just useful to know.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 01711bbf5adecd2c9fb2978a29a868aea51d0675..0c14511fa9e056d41ac8829cdf8bf46f8251ffe6 100644 (file)
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -29,7 +29,49 @@ struct blk_mq_debugfs_attr {
 
 static struct dentry *block_debugfs_root;
 
+static int hctx_state_show(struct seq_file *m, void *v)
+{
+       struct blk_mq_hw_ctx *hctx = m->private;
+
+       seq_printf(m, "0x%lx\n", hctx->state);
+       return 0;
+}
+
+static int hctx_state_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, hctx_state_show, inode->i_private);
+}
+
+static const struct file_operations hctx_state_fops = {
+       .open           = hctx_state_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int hctx_flags_show(struct seq_file *m, void *v)
+{
+       struct blk_mq_hw_ctx *hctx = m->private;
+
+       seq_printf(m, "0x%lx\n", hctx->flags);
+       return 0;
+}
+
+static int hctx_flags_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, hctx_flags_show, inode->i_private);
+}
+
+static const struct file_operations hctx_flags_fops = {
+       .open           = hctx_flags_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
+       {"state", 0400, &hctx_state_fops},
+       {"flags", 0400, &hctx_flags_fops},
 };
 
 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {