[PATCH 2/3] drm/framebuffer: Print task that allocated the fb in debug info.

[Daniel Vetter]

On Wed, Dec 20, 2017 at 10:35:44AM +0100, Maarten Lankhorst wrote:
> 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 at linux.intel.com>

I think we can polish this more later on, it's a good start.

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  drivers/gpu/drm/drm_fb_helper.c   | 1 +
>  drivers/gpu/drm/drm_framebuffer.c | 2 ++
>  include/drm/drm_framebuffer.h     | 6 ++++++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 04a3a5ce370a..d396d74a7dda 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1848,6 +1848,7 @@ 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
>  	 */
> -- 
> 2.15.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch