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

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Message-Id: <20220304005317.776110-1-robdclark@gmail.com>
Date:   Thu,  3 Mar 2022 16:52:13 -0800
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Jordan Crouse <jordan@...micpenguin.net>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        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>,
        linux-kernel@...r.kernel.org (open list),
        Stephen Boyd <swboyd@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH 0/4] drm/msm: Clear perf counters across context switch

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

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2.35.1