linux-kernel - Re: [PATCH 0/7] Preemption support for A7XX

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Message-ID: <CAF6AEGsiu2OBbwQJO5nS55CAQtCvKebc59-mu2h0BDiu4C2gxg@mail.gmail.com>
Date: Fri, 16 Aug 2024 10:47:48 -0700
From: Rob Clark <robdclark@...il.com>
To: Antonino Maniscalco <antomani103@...il.com>
Cc: Sean Paul <sean@...rly.run>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, Sharat Masetty <smasetty@...eaurora.org>
Subject: Re: [PATCH 0/7] Preemption support for A7XX

On Thu, Aug 15, 2024 at 11:27 AM Antonino Maniscalco
<antomani103@...il.com> wrote:
>
> This series implements preemption for A7XX targets, which allows the GPU to
> switch to an higher priority ring when work is pushed to it, reducing latency
> for high priority submissions.
>
> This series enables L1 preemption with skip_save_restore which requires
> the following userspace patches to function:
>
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30544
>
> A flag is added to `msm_gem_submit` to only allow submissions from compatible
> userspace to be preempted, therefore maintaining compatibility.

I guess this last para is from an earlier iteration of this series?
Looks like instead you are making this a submitqueue flag (which is an
approach that I prefer)

BR,
-R

> Some commits from this series are based on a previous series to enable
> preemption on A6XX targets:
>
> https://lkml.kernel.org/1520489185-21828-1-git-send-email-smasetty@codeaurora.org
>
> Signed-off-by: Antonino Maniscalco <antomani103@...il.com>
> ---
> Antonino Maniscalco (7):
>       drm/msm: Fix bv_fence being used as bv_rptr
>       drm/msm: Add submitqueue setup and close
>       drm/msm: Add a `preempt_record_size` field
>       drm/msm/A6xx: Implement preemption for A7XX targets
>       drm/msm/A6xx: Add traces for preemption
>       drm/msm/A6XX: Add a flag to allow preemption to submitqueue_create
>       drm/msm/A6xx: Enable preemption for A7xx targets
>
>  drivers/gpu/drm/msm/Makefile              |   1 +
>  drivers/gpu/drm/msm/adreno/a6xx_catalog.c |   3 +
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c     | 339 ++++++++++++++++++++++-
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h     | 168 ++++++++++++
>  drivers/gpu/drm/msm/adreno/a6xx_preempt.c | 441 ++++++++++++++++++++++++++++++
>  drivers/gpu/drm/msm/adreno/adreno_gpu.h   |   1 +
>  drivers/gpu/drm/msm/msm_gpu.h             |   7 +
>  drivers/gpu/drm/msm/msm_gpu_trace.h       |  28 ++
>  drivers/gpu/drm/msm/msm_ringbuffer.h      |   8 +
>  drivers/gpu/drm/msm/msm_submitqueue.c     |  10 +
>  include/uapi/drm/msm_drm.h                |   5 +-
>  11 files changed, 995 insertions(+), 16 deletions(-)
> ---
> base-commit: 7c626ce4bae1ac14f60076d00eafe71af30450ba
> change-id: 20240815-preemption-a750-t-fcee9a844b39
>
> Best regards,
> --
> Antonino Maniscalco <antomani103@...il.com>
>