linux-kernel - Re: [PATCH 0/5] drm: Fix fb changes for async updates

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Date:   Tue, 5 Mar 2019 22:04:37 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     dri-devel@...ts.freedesktop.org, nicholas.kazlauskas@....com
Cc:     andrey.grodzovsky@....com, daniel.vetter@...ll.ch,
        linux-kernel@...r.kernel.org, Tomasz Figa <tfiga@...omium.org>,
        boris.brezillon@...labora.com, David Airlie <airlied@...ux.ie>,
        Sean Paul <seanpaul@...gle.com>, kernel@...labora.com,
        harry.wentland@....com,
        Stéphane Marchesin <marcheu@...gle.com>
Subject: Re: [PATCH 0/5] drm: Fix fb changes for async updates



On 3/4/19 11:49 AM, Helen Koike wrote:
> Hello,
> 
> This series is a first attempt to fix the slow down in performance introduced by
> "[PATCH v2] drm: Block fb changes for async plane updates" where async update
> falls back to a sync update, causing igt failures of type:
> 
>     "CRITICAL: completed 97 cursor updated in a period of 30 flips, we
>     expect to complete approximately 15360 updates, with the threshold set
>     at 7680"
> 
> Please read the commit message of the first patch to understand how it works.
> 
> I tested on the rockchip and on i915 (with a patch I am still working on for
> replacing cursors by async update), with igt plane_cursor_legacy and
> kms_cursor_legacy and I didn't see any regressions.
> I couldn't test on MSM and AMD because I don't have the hardware and my vc4
> raspberry pi is not recognizing my display for some reason, I would appreciate
> if anyone could help me testing those.

I managed to test on vc4, tests look good to me, please see
https://patchwork.kernel.org/patch/10837857/ for more details.

Thanks
Helen

> I also separated the patches per platform to be easier to get the tested-by tags,
> please let me know if it should be a single patch.
> 
> Also, I added CC stable (as the "drm: Block fb changes for async plane updates"
> was also CCed to stable).
> I am not used to CC stable, please let me know if anything is off.
> 
> Thanks!
> Helen
> 
> 
> Helen Koike (5):
>   drm: don't block fb changes for async plane updates
>   drm/rockchip: fix fb references in async update
>   drm/amd: fix fb references in async update
>   drm/msm: fix fb references in async update
>   drm/vc4: fix fb references in async update
> 
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  3 +-
>  drivers/gpu/drm/drm_atomic_helper.c           | 20 ++++-----
>  drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c    |  4 ++
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c   | 42 +++++++++++--------
>  drivers/gpu/drm/vc4/vc4_plane.c               |  2 +-
>  5 files changed, 40 insertions(+), 31 deletions(-)
>