[PATCH v2 0/6] iommu-arm-smmu: Add auxiliary domains and per-instance pagetables

From: Jordan Crouse <jcrouse@codeaurora.org>
To: linux-arm-msm@vger.kernel.org
Cc: Sean Paul <sean@poorly.run>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
	Joerg Roedel <jroedel@suse.de>,
	Jonathan Marek <jonathan@marek.ca>,
	David Airlie <airlied@linux.ie>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	Akhil P Oommen <akhilpo@codeaurora.org>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	freedreno@lists.freedesktop.org,
	Sharat Masetty <smasetty@codeaurora.org>,
	Yong Wu <yong.wu@mediatek.com>,
	Emil Velikov <emil.velikov@collabora.com>
Subject: [PATCH v2 0/6] iommu-arm-smmu: Add auxiliary domains and per-instance pagetables
Date: Fri, 26 Jun 2020 14:04:08 -0600	[thread overview]
Message-ID: <20200626200414.14382-1-jcrouse@codeaurora.org> (raw)

This is a new refresh of support for auxiliary domains for arm-smmu-v2
and per-instance pagetables for drm/msm. The big change here from past
efforts is that outside of creating a single aux-domain to enable TTBR0
all of the per-instance pagetables are created and managed exclusively
in drm/msm without involving the arm-smmu driver. This fits in with the
suggested model of letting the GPU hardware do what it needs and leave the
arm-smmu driver blissfully unaware.

Almost. In order to set up the io-pgtable properly in drm/msm we need to
query the pagetable configuration from the current active domain and we need to
rely on the iommu API to flush TLBs after a unmap. In the future we can optimize
this in the drm/msm driver to track the state of the TLBs but for now the big
hammer lets us get off the ground.

This series is built on the split pagetable support [1].

[1] https://patchwork.kernel.org/patch/11628543/

v2: Remove unneeded cruft in the a6xx page switch sequence

Jordan Crouse (6):
  iommu/arm-smmu: Add auxiliary domain support for arm-smmuv2
  iommu/io-pgtable: Allow a pgtable implementation to skip TLB
    operations
  iommu/arm-smmu: Add a domain attribute to pass the pagetable config
  drm/msm: Add support to create a local pagetable
  drm/msm: Add support for address space instances
  drm/msm/a6xx: Add support for per-instance pagetables

 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |  43 +++++
 drivers/gpu/drm/msm/msm_drv.c         |  15 +-
 drivers/gpu/drm/msm/msm_drv.h         |   4 +
 drivers/gpu/drm/msm/msm_gem_vma.c     |   9 +
 drivers/gpu/drm/msm/msm_gpu.c         |  17 ++
 drivers/gpu/drm/msm/msm_gpu.h         |   5 +
 drivers/gpu/drm/msm/msm_gpummu.c      |   2 +-
 drivers/gpu/drm/msm/msm_iommu.c       | 180 +++++++++++++++++++-
 drivers/gpu/drm/msm/msm_mmu.h         |  16 +-
 drivers/gpu/drm/msm/msm_ringbuffer.h  |   1 +
 drivers/iommu/arm-smmu.c              | 231 ++++++++++++++++++++++++--
 drivers/iommu/arm-smmu.h              |   1 +
 include/linux/io-pgtable.h            |  11 +-
 include/linux/iommu.h                 |   1 +
 14 files changed, 507 insertions(+), 29 deletions(-)

-- 
2.17.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel