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authorOmar Sandoval <osandov@fb.com>2017-01-25 19:06:41 +0300
committerJens Axboe <axboe@fb.com>2017-01-27 18:17:44 +0300
commit9abb2ad21e8b9b7a2555411fbee225a508cf962d (patch)
treef08b9b296ac05657625ac4c26caffbd53e0258da /block
parent07e4fead45e6e1932f0b960655ab554b6aab6a08 (diff)
downloadlinux-9abb2ad21e8b9b7a2555411fbee225a508cf962d.tar.xz
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-debugfs.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 01711bbf5ade..0c14511fa9e0 100644
--- 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[] = {