linux-kernel - [PATCH v2 0/3] drm/msm: Improved devfreq tuning

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Message-Id: <20210726144653.2180096-1-robdclark@gmail.com>
Date:   Mon, 26 Jul 2021 07:46:47 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), Jonathan Marek <jonathan@...ek.ca>,
        Jordan Crouse <jordan@...micpenguin.net>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        linux-kernel@...r.kernel.org (open list),
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>
Subject: [PATCH v2 0/3] drm/msm: Improved devfreq tuning

From: Rob Clark <robdclark@...omium.org>

This is the outcome of trying to fix some bad gpu freq behavior seen in
some use-cases, in particular mobile games that throttle themselves to
30fps.  With the existing tuning, we'd end up spending most of the time
that we should be running fast at a low freq, and most of the idle time
at a high freq.

First two patches are prep, 3/3 is the interesting bit.  See the patch
description in 3/3 for more details.

v2: struct_mutex serializes the submit path, but not the retire path,
    so add a dedicated lock to serialize active<->idle transitions.

Rob Clark (3):
  drm/msm: Split out devfreq handling
  drm/msm: Split out get_freq() helper
  drm/msm: Devfreq tuning

 drivers/gpu/drm/msm/Makefile          |   1 +
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |   4 +-
 drivers/gpu/drm/msm/msm_gpu.c         | 132 +++--------------
 drivers/gpu/drm/msm/msm_gpu.h         |  61 +++++++-
 drivers/gpu/drm/msm/msm_gpu_devfreq.c | 203 ++++++++++++++++++++++++++
 5 files changed, 280 insertions(+), 121 deletions(-)
 create mode 100644 drivers/gpu/drm/msm/msm_gpu_devfreq.c

-- 
2.31.1