linux-kernel - Re: [PATCH v10 00/15] dma-fence: Deadline awareness

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Date:   Mon, 27 Mar 2023 15:05:48 -0400
From:   Matt Turner <mattst88@...il.com>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
        Luben Tuikov <luben.tuikov@....com>,
        Christian König <ckoenig.leichtzumerken@...il.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>, Liu Shixin <liushixin2@...wei.com>,
        Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Vinod Polimera <quic_vpolimer@...cinc.com>
Subject: Re: [PATCH v10 00/15] dma-fence: Deadline awareness

On Wed, Mar 8, 2023 at 10:53 AM Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> This series adds a deadline hint to fences, so realtime deadlines
> such as vblank can be communicated to the fence signaller for power/
> frequency management decisions.
>
> This is partially inspired by a trick i915 does, but implemented
> via dma-fence for a couple of reasons:
>
> 1) To continue to be able to use the atomic helpers
> 2) To support cases where display and gpu are different drivers
>
> This iteration adds a dma-fence ioctl to set a deadline (both to
> support igt-tests, and compositors which delay decisions about which
> client buffer to display), and a sw_sync ioctl to read back the
> deadline.  IGT tests utilizing these can be found at:


I read through the series and didn't spot anything. Have a rather weak

Reviewed-by: Matt Turner <mattst88@...il.com>

Thanks!