drm/framebuffer: Print task that allocated the fb in debug info.

This is is very useful to finding sources of leaked framebufers.
The fbcon fb is annotated with [fbcon], to give it a better name
than kworker.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220093545.613-3-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 4a61e1aef41b..035784ddd133 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1896,6 +1896,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
         if (ret < 0)
                 return ret;
 
+        strcpy(fb_helper->fb->comm, "[fbcon]");
         return 0;
 }
 
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index d63d4c2ac4c8..5a13ff29f4f0 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -664,6 +664,7 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
         INIT_LIST_HEAD(&fb->filp_head);
 
         fb->funcs = funcs;
+        strcpy(fb->comm, current->comm);
 
         ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
                                     false, drm_framebuffer_free);
@@ -978,6 +979,7 @@ void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
         struct drm_format_name_buf format_name;
         unsigned int i;
 
+        drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
         drm_printf_indent(p, indent, "refcount=%u\n",
                           drm_framebuffer_read_refcount(fb));
         drm_printf_indent(p, indent, "format=%s\n",
diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h
index dccb897951ba..c50502c656e5 100644
--- a/include/drm/drm_framebuffer.h
+++ b/include/drm/drm_framebuffer.h
@@ -121,6 +121,12 @@ struct drm_framebuffer {
          * @base: base modeset object structure, contains the reference count.
          */
         struct drm_mode_object base;
+
+        /**
+         * @comm: Name of the process allocating the fb, used for fb dumping.
+         */
+        char comm[TASK_COMM_LEN];
+
         /**
          * @format: framebuffer format information
          */