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>, <linux-kernel@vger.kernel.org>
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 [thread overview]
Message-ID: <20200630195737.8667-1-rcampbell@nvidia.com> (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:
https://lore.kernel.org/linux-mm/20200619215649.32297-1-rcampbell@nvidia.com/
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(-)
--
2.20.1
next reply other threads:[~2020-06-30 19:58 UTC|newest]
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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