linux-kernel - [PATCH v2 0/7] drm/msm/a6xx: System Cache Support

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Date:   Thu,  2 Jan 2020 16:32:06 +0530
From:   Sharat Masetty <smasetty@...eaurora.org>
To:     freedreno@...ts.freedesktop.org
Cc:     dri-devel@...edesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, will@...nel.org,
        robin.murphy@....com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, jcrouse@...eaurora.org,
        saiprakash.ranjan@...eaurora.org,
        Sharat Masetty <smasetty@...eaurora.org>
Subject: [PATCH v2 0/7] drm/msm/a6xx: System Cache Support

Some hardware variants contain a system level cache or the last level
cache(llc). This cache is typically a large block which is shared by multiple
clients on the SOC. GPU uses the system cache to cache both the GPU data
buffers(like textures) as well the SMMU pagetables. This helps with
improved render performance as well as lower power consumption by reducing
the bus traffic to the system memory.

The system cache architecture allows the cache to be split into slices which
then be used by multiple SOC clients. This patch series is an effort to enable
and use two of those slices perallocated for the GPU, one for the GPU data
buffers and another for the GPU SMMU hardware pagetables.

v2: Code reviews and rebased code on top of Jordan's split pagetables series

To enable the system cache driver, add [1] to your stack if not already
present. Please review.

[1] https://lore.kernel.org/patchwork/patch/1165298/

Jordan Crouse (3):
  iommu/arm-smmu: Pass io_pgtable_cfg to impl specific init_context
  drm/msm: Attach the IOMMU device during initialization
  drm/msm: Refactor address space initialization

Sharat Masetty (3):
  drm: msm: a6xx: Properly free up the iommu objects
  drm/msm: rearrange the gpu_rmw() function
  drm/msm/a6xx: Add support for using system cache(LLC)

Vivek Gautam (1):
  iommu/arm-smmu: Add domain attribute for QCOM system cache

 drivers/gpu/drm/msm/adreno/a2xx_gpu.c    |  16 ++++
 drivers/gpu/drm/msm/adreno/a3xx_gpu.c    |   1 +
 drivers/gpu/drm/msm/adreno/a4xx_gpu.c    |   1 +
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c    |   1 +
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c    | 124 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h    |   3 +
 drivers/gpu/drm/msm/adreno/adreno_gpu.c  |  23 ++++--
 drivers/gpu/drm/msm/adreno/adreno_gpu.h  |   8 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  |  19 ++---
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c |  19 ++---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c |   4 -
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c |  19 +++--
 drivers/gpu/drm/msm/msm_drv.c            |   8 ++
 drivers/gpu/drm/msm/msm_drv.h            |   9 +--
 drivers/gpu/drm/msm/msm_gem_vma.c        |  37 ++-------
 drivers/gpu/drm/msm/msm_gpu.c            |  49 +-----------
 drivers/gpu/drm/msm/msm_gpu.h            |   9 +--
 drivers/gpu/drm/msm/msm_gpummu.c         |   7 --
 drivers/gpu/drm/msm/msm_iommu.c          |  22 +++---
 drivers/gpu/drm/msm/msm_mmu.h            |   5 +-
 drivers/iommu/arm-smmu-impl.c            |   3 +-
 drivers/iommu/arm-smmu-qcom.c            |  10 +++
 drivers/iommu/arm-smmu.c                 |  25 +++++--
 drivers/iommu/arm-smmu.h                 |   4 +-
 include/linux/iommu.h                    |   1 +
 25 files changed, 269 insertions(+), 158 deletions(-)

--
1.9.1