drm/mm: add ability to dump mm lists via debugfs

This adds code to the drm_mm to talk to debugfs, and adds
support to radeon to add the VRAM and GTT mm lists to debugfs.

I tested with spinlock debugging and it doesn't give out.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index f8332073d277..bc5a87e8aeea 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -96,4 +96,8 @@ static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
         return block->mm;
 }
 
+#ifdef CONFIG_DEBUG_FS
+int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
+#endif
+
 #endif