Commit 9abb2ad2 authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
Browse files

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: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 07e4fead

block/blk-mq-debugfs.c

+42 −0
Original line number Diff line number Diff line
@@ -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[] = {