[RFC PATCH v2 00/14] Enable LPAC on a7xx series GPUs

[Anna Maniscalco]

This series enables LPAC (Low Priority Async Compute) on a7xx GPUs.

This allows to expose a separate queue to userspace that only supports
compute operations, in turn this can be exposed as a vulakn compute
queue by turnip https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39889

Currently hangcheck and recovery are broken as the patches to make them
work depend on https://lore.kernel.org/linux-arm-msm/20250911-preemption_aware_hangcheck-v1-0-974819876819@gmail.com/

The series also depends on https://lore.kernel.org/linux-arm-msm/177919116291.814652.1720687887970998122.b4-ty@kernel.org/
to work correctly.

It is still an RFC as something needs to be done about hang detection
with multiple rings first.

Signed-off-by: Anna Maniscalco <anna.maniscalco2000 at gmail.com>
---
Changes in v2:
- Made LPAC register writes conditional on lpac being supported and
  enabled
- Made LPAC a child node in dts
- Added a quirk to flag GPUs that have LPAC
- Hide LPAC behind modparam
- Several bug fixes (including addressing sashiko's reports)
- Link to v1: https://patch.msgid.link/20260705-descriptive-name-lpac-upstream-v1-0-01d50c3e0c99@gmail.com

To: Rob Clark <robin.clark at oss.qualcomm.com>
To: Will Deacon <will at kernel.org>
To: Robin Murphy <robin.murphy at arm.com>
To: Joerg Roedel <joro at 8bytes.org>
To: Sean Paul <sean at poorly.run>
To: Konrad Dybcio <konradybcio at kernel.org>
To: Akhil P Oommen <akhilpo at oss.qualcomm.com>
To: Dmitry Baryshkov <lumag at kernel.org>
To: Abhinav Kumar <abhinav.kumar at linux.dev>
To: Jessica Zhang <jesszhan0024 at gmail.com>
To: Marijn Suijten <marijn.suijten at somainline.org>
To: David Airlie <airlied at gmail.com>
To: Simona Vetter <simona at ffwll.ch>
To: Bjorn Andersson <andersson at kernel.org>
To: Rob Herring <robh at kernel.org>
To: Krzysztof Kozlowski <krzk+dt at kernel.org>
To: Conor Dooley <conor+dt at kernel.org>
To: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
To: Maxime Ripard <mripard at kernel.org>
To: Thomas Zimmermann <tzimmermann at suse.de>
Cc: iommu at lists.linux.dev
Cc: linux-arm-msm at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: freedreno at lists.freedesktop.org
Cc: devicetree at vger.kernel.org

---
Anna Maniscalco (14):
      iommu: arm-smmu-qcom: Configure lpac device with split address space
      drm/msm: add support for lpac_domain in msm_mmu
      drm/msm: look for lpac from dts
      arm64: dts: qcom: sm8650: move smmu sid 1 to new lpac device
      firmware: qcom: scm: Configure LPAC aperture
      DEBUGGING: print contextbank and other ttbrs on fault
      iommu: arm-smmu-qcom: Fixed mapping between sid and cb for gpu and lpac
      temp: add LPAC regs
      drm/msm: initialize LPAC ring
      drm/msm: Add LPAC submitqueue
      drm/msm: set ctxbank and asid based on ring
      drm/msm: add lpac ring to devcoredump
      drm/msm: gate lpac behind modparam
      drm/msm: enable LPAC on gen70900

 arch/arm64/boot/dts/qcom/sm8650.dtsi          |   9 +-
 drivers/firmware/qcom/qcom_scm.c              |  18 +++
 drivers/gpu/drm/msm/adreno/a6xx_catalog.c     |   4 +-
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c         |   2 +-
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c         | 200 +++++++++++++++++++++-----
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h         |   2 +-
 drivers/gpu/drm/msm/adreno/adreno_device.c    |  20 +++
 drivers/gpu/drm/msm/adreno/adreno_gpu.c       |  99 +++++++++----
 drivers/gpu/drm/msm/adreno/adreno_gpu.h       |   1 +
 drivers/gpu/drm/msm/msm_gem_submit.c          |   6 +-
 drivers/gpu/drm/msm/msm_gpu.c                 |  62 ++++++--
 drivers/gpu/drm/msm/msm_gpu.h                 |  18 ++-
 drivers/gpu/drm/msm/msm_iommu.c               | 170 +++++++++++++++++++---
 drivers/gpu/drm/msm/msm_mmu.h                 |   7 +-
 drivers/gpu/drm/msm/msm_submitqueue.c         |  14 +-
 drivers/gpu/drm/msm/registers/adreno/a6xx.xml |  14 ++
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c    |  38 ++++-
 include/linux/adreno-smmu-priv.h              |   2 +
 include/linux/firmware/qcom/qcom_scm.h        |   1 +
 include/uapi/drm/msm_drm.h                    |   2 +
 20 files changed, 575 insertions(+), 114 deletions(-)
---
base-commit: 9a967125427e03c7ebc24d7ad26e9307e8403d4e
change-id: 20260603-descriptive-name-lpac-upstream-730a164b105b

Best regards,
--  
Anna Maniscalco <anna.maniscalco2000 at gmail.com>