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From:   Ralph Campbell <rcampbell@nvidia.com>
To:     <linux-rdma@vger.kernel.org>, <linux-mm@kvack.org>,
        <nouveau@lists.freedesktop.org>, <linux-kselftest@vger.kernel.org>,
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CC:     Jerome Glisse <jglisse@redhat.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Christoph Hellwig <hch@lst.de>,
        Jason Gunthorpe <jgg@mellanox.com>,
        "Andrew Morton" <akpm@linux-foundation.org>,
        Shuah Khan <shuah@kernel.org>,
        "Ben Skeggs" <bskeggs@redhat.com>,
        Ralph Campbell <rcampbell@nvidia.com>
Subject: [PATCH v2 0/5] mm/hmm/nouveau: add PMD system memory mapping
Date:   Tue, 30 Jun 2020 12:57:32 -0700
Message-ID: <20200630195737.8667-1-rcampbell@nvidia.com>
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The goal for this series is to introduce the hmm_range_fault() output
array flags HMM_PFN_PMD and HMM_PFN_PUD. This allows a device driver to
know that a given 4K PFN is actually mapped by the CPU using either a
PMD sized or PUD sized CPU page table entry and therefore the device
driver can safely map system memory using larger device MMU PTEs.
The series is based on 5.8.0-rc3 and is intended for Jason Gunthorpe's
hmm tree. These were originally part of a larger series:
https://lore.kernel.org/linux-mm/20200619215649.32297-1-rcampbell@nvidia.co=
m/

Changes in v2:
Make the hmm_range_fault() API changes into a separate series and add
  two output flags for PMD/PUD instead of a single compund page flag as
  suggested by Jason Gunthorpe.
Make the nouveau page table changes a separate patch as suggested by
  Ben Skeggs.
Only add support for 2MB nouveau mappings initially since changing the
1:1 CPU/GPU page table size assumptions requires a bigger set of changes.
Rebase to 5.8.0-rc3.

Ralph Campbell (5):
  nouveau/hmm: fault one page at a time
  mm/hmm: add output flags for PMD/PUD page mapping
  nouveau: fix mapping 2MB sysmem pages
  nouveau/hmm: support mapping large sysmem pages
  hmm: add tests for HMM_PFN_PMD flag

 drivers/gpu/drm/nouveau/nouveau_svm.c         | 238 ++++++++----------
 drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c |   5 +-
 .../drm/nouveau/nvkm/subdev/mmu/vmmgp100.c    |  82 ++++++
 include/linux/hmm.h                           |  11 +-
 lib/test_hmm.c                                |   4 +
 lib/test_hmm_uapi.h                           |   4 +
 mm/hmm.c                                      |  13 +-
 tools/testing/selftests/vm/hmm-tests.c        |  76 ++++++
 8 files changed, 290 insertions(+), 143 deletions(-)

--=20
2.20.1