linux-kernel - [PATCH v5 0/5] drm/msm: rework the ties between KMS and GPU parts of the driver

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Message-Id: <20250918-msm-gpu-split-v5-0-44486f44d27d@oss.qualcomm.com>
Date: Thu, 18 Sep 2025 06:50:21 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: [PATCH v5 0/5] drm/msm: rework the ties between KMS and GPU parts
 of the driver

Currently the KMS and GPU parts of the msm driver are pretty much
intertwined. It is impossible to register a KMS-only device and
registering a GPU-only DRM device requires modifying the DT.  Not to
mention that binding the GPU-only device creates an interim platform
devices, which complicates IOMMU setup.

Rework the driver:
- Make it possible to disable KMS parts (if MDP4, MDP5 and DPU drivers
  are disabled).
- Register GPU-only devices without an interim platform device.
- Add module param that makes msm driver register GPU and KMS devices
  separately.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v5:
- Rebased on msm-next, dropped applied patches, re-picked up no-GPU
  patch
- Rewored debugfs, GEM VM_BIND and ioctls code to reduce number of
  #ifdef's
- Link to v4: https://lore.kernel.org/r/20250705-msm-gpu-split-v4-0-fb470c481131@oss.qualcomm.com

Changes in v4:
- Rebased on msm-next(-robclark)
- Temporarily dropped the "no-GPU" patch, it will be reposted later
  (Rob)
- Link to v3: https://lore.kernel.org/r/20250518-msm-gpu-split-v3-0-0e91e8e77023@oss.qualcomm.com

Changes in v3:
- Disabled SYNCOBJ / SYNCOBJ_TIMELINE for KMS-only driver (Rob Clark)
- Further refine Kconfig dependencies
- Link to v2: https://lore.kernel.org/r/20250503-msm-gpu-split-v2-0-1292cba0f5ad@oss.qualcomm.com

Changes in v2:
- Got rid of mdp4_crtc.id and msm_drm_private.num_crtcs
- Moved msm_drm_private.wq and msm_drm_private.event_thread to struct
  msm_kms (Rob Clark)
- Moved HDMI / DSI / DP pointers to msm_kms (Abhinav)
- Link to v1: https://lore.kernel.org/r/20250413-msm-gpu-split-v1-0-1132f4b616c7@oss.qualcomm.com

---
Dmitry Baryshkov (5):
      drm/msm: correct separate_gpu_kms description
      drm/msm: split VM_BIND from the rest of GEM VMA code
      drm/msm: split away IOCTLs implementation
      drm/msm: split debugfs implementation
      drm/msm: make it possible to disable GPU support

 drivers/gpu/drm/msm/Kconfig           |   27 +-
 drivers/gpu/drm/msm/Makefile          |   21 +-
 drivers/gpu/drm/msm/msm_debugfs.c     |  420 ------------
 drivers/gpu/drm/msm/msm_debugfs.h     |   14 -
 drivers/gpu/drm/msm/msm_drv.c         |  645 +++---------------
 drivers/gpu/drm/msm/msm_drv.h         |   16 -
 drivers/gpu/drm/msm/msm_gem.h         |   10 +
 drivers/gpu/drm/msm/msm_gem_debugfs.c |   96 +++
 drivers/gpu/drm/msm/msm_gem_vm_bind.c | 1116 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_gem_vma.c     | 1177 +--------------------------------
 drivers/gpu/drm/msm/msm_gem_vma.h     |  119 ++++
 drivers/gpu/drm/msm/msm_gpu.c         |   45 ++
 drivers/gpu/drm/msm/msm_gpu.h         |  111 +++-
 drivers/gpu/drm/msm/msm_gpu_debugfs.c |  213 ++++++
 drivers/gpu/drm/msm/msm_ioctl.c       |  484 ++++++++++++++
 drivers/gpu/drm/msm/msm_ioctl.h       |   37 ++
 drivers/gpu/drm/msm/msm_kms.h         |    8 +
 drivers/gpu/drm/msm/msm_kms_debugfs.c |  129 ++++
 drivers/gpu/drm/msm/msm_submitqueue.c |   12 +-
 19 files changed, 2463 insertions(+), 2237 deletions(-)
---
base-commit: 05af764719214d6568adb55c8749dec295228da8
change-id: 20250411-msm-gpu-split-2701e49e40f0

Best regards,
-- 
With best wishes
Dmitry