linux-kernel - Re: [PATCH 00/15] drm: cleanup: Use DRM_MODESET_LOCK_ALL

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: <YUSzKxZwW8C29dLV@phenom.ffwll.local>
Date:   Fri, 17 Sep 2021 17:24:27 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Fernando Ramos <greenfoo@....eu>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        sean@...rly.run, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 00/15] drm: cleanup: Use DRM_MODESET_LOCK_ALL_* helpers
 where possible

On Thu, Sep 16, 2021 at 11:15:37PM +0200, Fernando Ramos wrote:
> Hi all,
> 
> One of the things in the DRM TODO list ("Documentation/gpu/todo.rst") was to
> "use DRM_MODESET_LOCAL_ALL_* helpers instead of boilerplate". That's what this
> patch series is about.
> 
> You will find two types of changes here:
> 
>   - Replacing "drm_modeset_lock_all_ctx()" (and surrounding boilerplate) with
>     "DRM_MODESET_LOCK_ALL_BEGIN()/END()" in the remaining places (as it has
>     already been done in previous commits such as b7ea04d2)
> 
>   - Replacing "drm_modeset_lock_all()" with "DRM_MODESET_LOCK_ALL_BEGIN()/END()"
>     in the remaining places (as it has already been done in previous commits
>     such as 57037094)
>     
> Most of the changes are straight forward, except for a few cases in the "amd"
> and "i915" drivers where some extra dancing was needed to overcome the
> limitation that the DRM_MODESET_LOCK_ALL_BEGIN()/END() macros can only be used
> once inside the same function (the reason being that the macro expansion
> includes *labels*, and you can not have two labels named the same inside one
> function)
> 
> Notice that, even after this patch series, some places remain where
> "drm_modeset_lock_all()" and "drm_modeset_lock_all_ctx()" are still present,
> all inside drm core (which makes sense), except for two (in "amd" and "i915")
> which cannot be replaced due to the way they are being used.

Can we at least replace those with drm_modeset_lock_all_ctx and delete
drm_modeset_lock_all? That would be really nice goal to make sure these
don't spread further.

Otherwise great stuff, I'm trying to volunteer a few reviewers.
-Daniel

> 
> Fernando Ramos (15):
>   dmr: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   dmr/i915: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   dmr/msm: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/vmwgfx: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/tegra: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/shmobile: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/radeon: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/omapdrm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/nouveau: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/msm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/i915: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/gma500: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   drm/amd: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()
>   doc: drm: remove TODO entry regarding DRM_MODSET_LOCK_ALL cleanup
> 
>  Documentation/gpu/todo.rst                    | 17 -------
>  Documentation/locking/ww-mutex-design.rst     |  2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   | 13 +++--
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 50 +++++++++----------
>  .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 23 +++++----
>  drivers/gpu/drm/drm_client_modeset.c          | 14 +++---
>  drivers/gpu/drm/drm_crtc_helper.c             | 18 ++++---
>  drivers/gpu/drm/drm_fb_helper.c               | 10 ++--
>  drivers/gpu/drm/drm_framebuffer.c             |  6 ++-
>  drivers/gpu/drm/gma500/psb_device.c           | 14 ++++--
>  drivers/gpu/drm/i915/display/intel_audio.c    | 12 +++--
>  drivers/gpu/drm/i915/display/intel_display.c  | 22 +++-----
>  .../drm/i915/display/intel_display_debugfs.c  | 35 ++++++++-----
>  drivers/gpu/drm/i915/display/intel_overlay.c  | 45 ++++++++---------
>  drivers/gpu/drm/i915/display/intel_pipe_crc.c |  5 +-
>  drivers/gpu/drm/i915/i915_drv.c               | 12 +++--
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 ++-
>  .../gpu/drm/msm/disp/msm_disp_snapshot_util.c | 10 ++--
>  drivers/gpu/drm/nouveau/dispnv50/disp.c       | 12 +++--
>  drivers/gpu/drm/omapdrm/omap_fb.c             |  6 ++-
>  drivers/gpu/drm/radeon/radeon_device.c        | 13 +++--
>  drivers/gpu/drm/radeon/radeon_dp_mst.c        |  7 ++-
>  drivers/gpu/drm/shmobile/shmob_drm_drv.c      |  6 ++-
>  drivers/gpu/drm/tegra/dsi.c                   |  6 ++-
>  drivers/gpu/drm/tegra/hdmi.c                  |  5 +-
>  drivers/gpu/drm/tegra/sor.c                   | 10 ++--
>  drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c         | 11 ++--
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c           | 12 +++--
>  28 files changed, 222 insertions(+), 180 deletions(-)
> 
> -- 
> 2.33.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch