drm/tegra: Provide debugfs file for the IOVA space

The Tegra DRM driver uses a single IO virtual address space for buffer
mappings. Provide a table of the address space usage in debugfs.

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 7dd328d77996..7ba7e2860ac8 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -879,8 +879,18 @@ static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
         return 0;
 }
 
+static int tegra_debugfs_iova(struct seq_file *s, void *data)
+{
+        struct drm_info_node *node = (struct drm_info_node *)s->private;
+        struct drm_device *drm = node->minor->dev;
+        struct tegra_drm *tegra = drm->dev_private;
+
+        return drm_mm_dump_table(s, &tegra->mm);
+}
+
 static struct drm_info_list tegra_debugfs_list[] = {
         { "framebuffers", tegra_debugfs_framebuffers, 0 },
+        { "iova", tegra_debugfs_iova, 0 },
 };
 
 static int tegra_debugfs_init(struct drm_minor *minor)