linux-kernel - [PATCH v3 0/8] Improve GPU Recovery

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Date:   Sat, 30 Jul 2022 15:10:43 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     freedreno <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Jordan Crouse <jordan@...micpenguin.net>,
        Jonathan Marek <jonathan@...ek.ca>,
        Douglas Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Nathan Chancellor <nathan@...nel.org>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Wang Qing <wangqing@...o.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 0/8] Improve GPU Recovery


Recently, I debugged a few device crashes which occured during recovery
after a hangcheck timeout. It looks like there are a few things we can
do to improve our chance at a successful gpu recovery.

First one is to ensure that CX GDSC collapses which clears the internal
states in gpu's CX domain. First 5 patches tries to handle this.

Rest of the patches are to ensure that few internal blocks like CP, GMU
and GBIF are halted properly before proceeding for a snapshot followed by
recovery. Also, handle 'prepare slumber' hfi failure correctly. These
are A6x specific improvements.

This series is rebased on top of [1] which based on linus's master
branch.

[1] https://patchwork.freedesktop.org/series/106860/

Changes in v3:
- Use reset interface from gpucc driver to poll for cx gdsc collapse
  https://patchwork.freedesktop.org/series/106860/
- Use single pm refcount for all active submits

Changes in v2:
- Rebased on msm-next tip

Akhil P Oommen (8):
  drm/msm: Remove unnecessary pm_runtime_get/put
  drm/msm: Take single rpm refcount on behalf of all submits
  drm/msm: Correct pm_runtime votes in recover worker
  drm/msm: Fix cx collapse issue during recovery
  drm/msm/a6xx: Ensure CX collapse during gpu recovery
  drm/msm/adreno: Remove a WARN() during runtime_suspend
  drm/msm/a6xx: Improve gpu recovery sequence
  drm/msm/a6xx: Handle GMU prepare-slumber hfi failure

 drivers/gpu/drm/msm/adreno/a6xx.xml.h      |  4 ++
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c      | 83 +++++++++++++++++++-----------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c      | 35 +++++++++++--
 drivers/gpu/drm/msm/adreno/adreno_device.c |  7 ---
 drivers/gpu/drm/msm/msm_gpu.c              | 21 +++++---
 drivers/gpu/drm/msm/msm_gpu.h              |  4 ++
 drivers/gpu/drm/msm/msm_ringbuffer.c       |  4 --
 7 files changed, 106 insertions(+), 52 deletions(-)

-- 
2.7.4