drm/tegra: Add list of framebuffers to debugfs

This list is most useful to inspect whether framebuffer reference
counting works as expected. The code is loosely based on the i915
implementation.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 97485af6eaf9..181a370c56c1 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -143,6 +143,45 @@ static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
                 tegra_dc_cancel_page_flip(crtc, file);
 }
 
+#ifdef CONFIG_DEBUG_FS
+static int tegra_debugfs_framebuffers(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 drm_framebuffer *fb;
+
+        mutex_lock(&drm->mode_config.fb_lock);
+
+        list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
+                seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
+                           fb->base.id, fb->width, fb->height, fb->depth,
+                           fb->bits_per_pixel,
+                           atomic_read(&fb->refcount.refcount));
+        }
+
+        mutex_unlock(&drm->mode_config.fb_lock);
+
+        return 0;
+}
+
+static struct drm_info_list tegra_debugfs_list[] = {
+        { "framebuffers", tegra_debugfs_framebuffers, 0 },
+};
+
+static int tegra_debugfs_init(struct drm_minor *minor)
+{
+        return drm_debugfs_create_files(tegra_debugfs_list,
+                                        ARRAY_SIZE(tegra_debugfs_list),
+                                        minor->debugfs_root, minor);
+}
+
+static void tegra_debugfs_cleanup(struct drm_minor *minor)
+{
+        drm_debugfs_remove_files(tegra_debugfs_list,
+                                 ARRAY_SIZE(tegra_debugfs_list), minor);
+}
+#endif
+
 struct drm_driver tegra_drm_driver = {
         .driver_features = DRIVER_BUS_PLATFORM | DRIVER_MODESET | DRIVER_GEM,
         .load = tegra_drm_load,
@@ -155,6 +194,11 @@ struct drm_driver tegra_drm_driver = {
         .enable_vblank = tegra_drm_enable_vblank,
         .disable_vblank = tegra_drm_disable_vblank,
 
+#if defined(CONFIG_DEBUG_FS)
+        .debugfs_init = tegra_debugfs_init,
+        .debugfs_cleanup = tegra_debugfs_cleanup,
+#endif
+
         .gem_free_object = drm_gem_cma_free_object,
         .gem_vm_ops = &drm_gem_cma_vm_ops,
         .dumb_create = drm_gem_cma_dumb_create,