linux-kernel - Re: [PATCH 0/4] drm/msm: Clear perf counters across context switch

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Date:   Mon, 7 Mar 2022 20:36:49 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     Rob Clark <robdclark@...il.com>, <dri-devel@...ts.freedesktop.org>
CC:     <freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "Bjorn Andersson" <bjorn.andersson@...aro.org>,
        Christian König <christian.koenig@....com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>,
        Emma Anholt <emma@...olt.net>,
        Jonathan Marek <jonathan@...ek.ca>,
        open list <linux-kernel@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Yangtao Li <tiny.windzz@...il.com>
Subject: Re: [PATCH 0/4] drm/msm: Clear perf counters across context switch

On 3/4/2022 6:22 AM, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> Some clever folks figured out a way to use performance counters as a
> side-channel[1].  But, other than the special case of using the perf
> counters for system profiling, we can reset the counters across context
> switches to protect against this.
>
> This series introduces a SYSPROF param which a sufficiently privilaged
> userspace (like Mesa's pps-producer, which already must run as root) to
> opt-out, and makes the default behavior to reset counters on context
> switches.
>
> [1] https://dl.acm.org/doi/pdf/10.1145/3503222.3507757
>
> Rob Clark (4):
>    drm/msm: Update generated headers
>    drm/msm: Add SET_PARAM ioctl
>    drm/msm: Add SYSPROF param (v2)
>    drm/msm/a6xx: Zap counters across context switch
>
>   drivers/gpu/drm/msm/adreno/a2xx.xml.h         |  26 +-
>   drivers/gpu/drm/msm/adreno/a2xx_gpu.c         |   1 +
>   drivers/gpu/drm/msm/adreno/a3xx.xml.h         |  30 +-
>   drivers/gpu/drm/msm/adreno/a3xx_gpu.c         |   1 +
>   drivers/gpu/drm/msm/adreno/a4xx.xml.h         | 112 ++-
>   drivers/gpu/drm/msm/adreno/a4xx_gpu.c         |   1 +
>   drivers/gpu/drm/msm/adreno/a5xx.xml.h         |  63 +-
>   drivers/gpu/drm/msm/adreno/a5xx_gpu.c         |   1 +
>   drivers/gpu/drm/msm/adreno/a6xx.xml.h         | 674 +++++++++++-------
>   drivers/gpu/drm/msm/adreno/a6xx_gmu.xml.h     |  26 +-
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c         |  30 +
>   .../gpu/drm/msm/adreno/adreno_common.xml.h    |  31 +-
>   drivers/gpu/drm/msm/adreno/adreno_gpu.c       |  14 +
>   drivers/gpu/drm/msm/adreno/adreno_gpu.h       |   2 +
>   drivers/gpu/drm/msm/adreno/adreno_pm4.xml.h   |  46 +-
>   drivers/gpu/drm/msm/disp/mdp4/mdp4.xml.h      |  37 +-
>   drivers/gpu/drm/msm/disp/mdp5/mdp5.xml.h      |  37 +-
>   drivers/gpu/drm/msm/disp/mdp_common.xml.h     |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi.xml.h             |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi_phy_10nm.xml.h    |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi_phy_14nm.xml.h    |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi_phy_20nm.xml.h    |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi_phy_28nm.xml.h    |  37 +-
>   .../gpu/drm/msm/dsi/dsi_phy_28nm_8960.xml.h   |  37 +-
>   drivers/gpu/drm/msm/dsi/dsi_phy_5nm.xml.h     | 480 -------------
>   drivers/gpu/drm/msm/dsi/dsi_phy_7nm.xml.h     |  43 +-
>   drivers/gpu/drm/msm/dsi/mmss_cc.xml.h         |  37 +-
>   drivers/gpu/drm/msm/dsi/sfpb.xml.h            |  37 +-
>   drivers/gpu/drm/msm/hdmi/hdmi.xml.h           |  37 +-
>   drivers/gpu/drm/msm/hdmi/qfprom.xml.h         |  37 +-
>   drivers/gpu/drm/msm/msm_drv.c                 |  28 +
>   drivers/gpu/drm/msm/msm_gpu.c                 |   2 +
>   drivers/gpu/drm/msm/msm_gpu.h                 |  29 +
>   drivers/gpu/drm/msm/msm_submitqueue.c         |  39 +
>   include/uapi/drm/msm_drm.h                    |  28 +-
>   35 files changed, 1058 insertions(+), 1130 deletions(-)
>   delete mode 100644 drivers/gpu/drm/msm/dsi/dsi_phy_5nm.xml.h
>

For the whole series except " drm/msm: Update generated headers",

Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>

-Akhil.