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From: Ralph Campbell <>
To: <>, <>,
	<>, <>
Cc: Jerome Glisse <>,
	John Hubbard <>,
	Christoph Hellwig <>,
	Jason Gunthorpe <>,
	"Andrew Morton" <>,
	Shuah Khan <>, "Ben Skeggs" <>,
	Ralph Campbell <>
Subject: [PATCH v2 0/5] mm/hmm/nouveau: add PMD system memory mapping
Date: Tue, 30 Jun 2020 12:57:32 -0700
Message-ID: <> (raw)

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:

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(-)


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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 19:57 Ralph Campbell [this message]
2020-06-30 19:57 ` [PATCH v2 1/5] nouveau/hmm: fault one page at a time Ralph Campbell
2020-06-30 19:57 ` [PATCH v2 2/5] mm/hmm: add output flags for PMD/PUD page mapping Ralph Campbell
2020-06-30 21:23   ` Matthew Wilcox
2020-06-30 22:20     ` Jason Gunthorpe
2020-06-30 19:57 ` [PATCH v2 3/5] nouveau: fix mapping 2MB sysmem pages Ralph Campbell
2020-06-30 19:57 ` [PATCH v2 4/5] nouveau/hmm: support mapping large " Ralph Campbell
2020-06-30 19:57 ` [PATCH v2 5/5] hmm: add tests for HMM_PFN_PMD flag Ralph Campbell

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