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/[email protected]/
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