linux-kernel - Re: [PATCH v2 08/34] drm/msm: Remove vram carveout support

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Message-ID: <q2tzc2cvzfu7hirxcd6l6vi7veynqdopdg2myjbjkzbslcu5bi@52pmnd3thdil>
Date: Thu, 17 Apr 2025 02:20:50 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robdclark@...il.com>
Cc: dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, Konrad Dybcio <konradybcio@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 08/34] drm/msm: Remove vram carveout support

On Wed, Mar 19, 2025 at 07:52:20AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> It is standing in the way of drm_gpuvm / VM_BIND support.  Not to
> mention frequently broken and rarely tested.  And I think only needed
> for a 10yr old not quite upstream SoC (msm8974).

Well... MSM8974 is quite upstream, but anyway, let's drop it. Maybe
somebody will write an IOMMU driver.

> 
> Maybe we can add support back in later, but I'm doubtful.
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/adreno/a2xx_gpu.c      |   6 +-
>  drivers/gpu/drm/msm/adreno/a3xx_gpu.c      |  13 +-
>  drivers/gpu/drm/msm/adreno/a4xx_gpu.c      |  13 +-
>  drivers/gpu/drm/msm/adreno/adreno_device.c |   4 -
>  drivers/gpu/drm/msm/adreno/adreno_gpu.h    |   1 -
>  drivers/gpu/drm/msm/msm_drv.c              | 117 +-----------------
>  drivers/gpu/drm/msm/msm_drv.h              |  11 --
>  drivers/gpu/drm/msm/msm_gem.c              | 131 ++-------------------
>  drivers/gpu/drm/msm/msm_gem.h              |   5 -
>  drivers/gpu/drm/msm/msm_gem_submit.c       |   5 -
>  10 files changed, 19 insertions(+), 287 deletions(-)

-- 
With best wishes
Dmitry