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

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Message-ID: <78d36089-5a65-41b3-a9fa-102266736d9b@gmail.com>
Date: Sat, 17 Aug 2024 01:42:42 +0200
From: Antonino Maniscalco <antomani103@...il.com>
To: Rob Clark <robdclark@...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 8/16/24 7:47 PM, Rob Clark wrote:
> 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
> 

That is correct, I got confused on which one I ended up going with when 
I wrote that.

Thanks for spotting it!

>> 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>
>>

Best regards,
-- 
Antonino Maniscalco <antomani103@...il.com>