linux-kernel - [PATCH v2 0/4] drm/msm: drm

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Message-Id: <20250903-msm-no-iommu-v2-0-993016250104@oss.qualcomm.com>
Date: Wed, 03 Sep 2025 13:51:48 +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>,
        Antonino Maniscalco <antomani103@...il.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
Subject: [PATCH v2 0/4] drm/msm: drm_gpuvm leftovers

After switching to drm_gpuvm, the IOMMU becomes a requirement even for
KMS-only devices (e.g. allocating a buffer for DSI commands now also
requires the IOMMU / GPUVM). Disallow non-IOMMU configurations.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v2:
- Corrected error messages (Konrad)
- Changed msm_kms_init_vm() to take mdss_dev an argument (Rob)
- Made msm_iommu_new() / msm_iommu_disp_new() / msm_iommu_gpu_new() fail
  instead of returning NULL if there is no IOMMU
- Link to v1: https://lore.kernel.org/r/20250706-msm-no-iommu-v1-0-9e8274b30c33@oss.qualcomm.com

---
Dmitry Baryshkov (4):
      drm/msm/mdp4: stop supporting no-IOMMU configuration
      drm/msm: stop supporting no-IOMMU configuration
      drm/msm: don't return NULL from msm_iommu_new()
      drm/msm/mdp4: use msm_kms_init_vm() instead of duplicating it

 drivers/gpu/drm/msm/adreno/a6xx_gmu.c    |  2 --
 drivers/gpu/drm/msm/adreno/adreno_gpu.c  |  4 +---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  |  2 +-
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 27 +++++----------------------
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c |  2 +-
 drivers/gpu/drm/msm/msm_drv.h            |  2 +-
 drivers/gpu/drm/msm/msm_iommu.c          |  6 +++---
 drivers/gpu/drm/msm/msm_kms.c            | 14 ++++++--------
 8 files changed, 18 insertions(+), 41 deletions(-)
---
base-commit: 3cf6147f2b51a569761e1ef010efbd891e3a3a15
change-id: 20250706-msm-no-iommu-c15212a0e7ac

Best regards,
-- 
With best wishes
Dmitry