linux-kernel - Re: [RFC PATCH 1/8] drm: writeback: Refactor drm_writeback

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <gvshpndrbnojzwewwa3icd5fjwecqj57jj6gfgoips5xq2oo3l@3dsebzcjwr7t>
Date: Mon, 11 Aug 2025 13:13:34 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Suraj Kandpal <suraj.kandpal@...el.com>
Cc: kernel-list@...pberrypi.com, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, ankit.k.nautiyal@...el.com,
        arun.r.murthy@...el.com, uma.shankar@...el.com, jani.nikula@...el.com,
        harry.wentland@....com, siqueira@...lia.com, alexander.deucher@....com,
        christian.koenig@....com, airlied@...il.com, simona@...ll.ch,
        liviu.dudau@....com, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, robin.clark@....qualcomm.com,
        abhinav.kumar@...ux.dev, tzimmermann@...e.de,
        jessica.zhang@....qualcomm.com, sean@...rly.run,
        marijn.suijten@...ainline.org,
        laurent.pinchart+renesas@...asonboard.com, mcanal@...lia.com,
        dave.stevenson@...pberrypi.com,
        tomi.valkeinen+renesas@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com, louis.chauvet@...tlin.com
Subject: Re: [RFC PATCH 1/8] drm: writeback: Refactor drm_writeback_connector
 structure

On Mon, Aug 11, 2025 at 02:57:00PM +0530, Suraj Kandpal wrote:
> Some drivers cannot work with the current design where the connector
> is embedded within the drm_writeback_connector such as intel and
> some drivers that can get it working end up adding a lot of checks
> all around the code to check if it's a writeback conenctor or not.
> To solve this we move the drm_writeback_connector within the
> drm_connector and remove the drm_connector base which was in
> drm_writeback_connector. We do all other required
> modifications that come with these changes along with addition
> of new function which returns the drm_connector when
> drm_writeback_connector is present.
> All drivers will be expected to allocate the drm_connector.
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal@...el.com>
> ---
>  drivers/gpu/drm/drm_writeback.c | 33 ++++++++++------
>  include/drm/drm_connector.h     | 60 +++++++++++++++++++++++++++++
>  include/drm/drm_writeback.h     | 68 ++++-----------------------------
>  3 files changed, 89 insertions(+), 72 deletions(-)

This patch breaks building of drivers:

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c: In function ‘dpu_encoder_phys_wb_prepare_for_kickoff’:
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:487:36: error: ‘struct drm_writeback_connector’ has no member named ‘base’
  487 |         drm_conn = &wb_enc->wb_conn->base;
      |                                    ^~

Please perform step-by-step modifications, making sure that on each
step all the drivers can be built and function as expected.

> 
> @@ -2305,6 +2360,11 @@ struct drm_connector {
>  	 * @cec: CEC-related data.
>  	 */
>  	struct drm_connector_cec cec;
> +
> +	/**
> +	 * @writeback: Writeback related valriables.
> +	 */
> +	struct drm_writeback_connector writeback;

I will respond to this in another thread.

>  };
>  
>  #define obj_to_connector(x) container_of(x, struct drm_connector, base)

-- 
With best wishes
Dmitry