linux-kernel - Re: [PATCH v3 10/10] drm/msm: Add a way for userspace to allocate GPU iova

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Date:   Thu, 7 Apr 2022 12:58:22 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Emma Anholt <emma@...olt.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 10/10] drm/msm: Add a way for userspace to allocate GPU
 iova

On 4/7/22 00:46, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> The motivation at this point is mainly native userspace mesa driver in a
> VM guest.  The one remaining synchronous "hotpath" is buffer allocation,
> because guest needs to wait to know the bo's iova before it can start
> emitting cmdstream/state that references the new bo.  By allocating the
> iova in the guest userspace, we no longer need to wait for a response
> from the host, but can just rely on the allocation request being
> processed before the cmdstream submission.  Allocation failures (OoM,
> etc) would just be treated as context-lost (ie. GL_GUILTY_CONTEXT_RESET)
> or subsequent allocations (or readpix, etc) can raise GL_OUT_OF_MEMORY.
> 
> v2: Fix inuse check
> v3: Change mismatched iova case to -EBUSY
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c | 10 ++++++
>  drivers/gpu/drm/msm/msm_drv.c           | 21 +++++++++++
>  drivers/gpu/drm/msm/msm_gem.c           | 48 +++++++++++++++++++++++++
>  drivers/gpu/drm/msm/msm_gem.h           |  8 +++++
>  drivers/gpu/drm/msm/msm_gem_vma.c       |  2 ++
>  include/uapi/drm/msm_drm.h              |  3 ++
>  6 files changed, 92 insertions(+)

Reviewed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>