On Tue, Jun 30, 2020 at 10:23:43PM +0100, Matthew Wilcox wrote:
> On Tue, Jun 30, 2020 at 12:57:34PM -0700, Ralph Campbell wrote:
> > hmm_range_fault() returns an array of page frame numbers and flags for
> > how the pages are mapped in the requested process' page tables. The PFN
> > can be used
On Tue, Jun 30, 2020 at 12:57:34PM -0700, Ralph Campbell wrote:
> hmm_range_fault() returns an array of page frame numbers and flags for
> how the pages are mapped in the requested process' page tables. The PFN
> can be used to get the struct page with hmm_pfn_to_page() and the page
> size order
The nvif_object_ioctl() method NVIF_VMM_V0_PFNMAP wasn't correctly
setting the hardware specific GPU page table entries for 2MB sized
pages. Fix this by adding functions to set and clear PD0 GPU page
table entries.
Signed-off-by: Ralph Campbell
---
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
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
The SVM page fault handler groups faults into a range of contiguous
virtual addresses and requests hmm_range_fault() to populate and
return the page frame number of system memory mapped by the CPU.
In preparation for supporting large pages to be mapped by the GPU,
process faults one page at a
hmm_range_fault() returns an array of page frame numbers and flags for
how the pages are mapped in the requested process' page tables. The PFN
can be used to get the struct page with hmm_pfn_to_page() and the page
size order can be determined with compound_order(page) but if the page
is larger
Add a sanity test for hmm_range_fault() returning the HMM_PFN_PMD
flag.
Signed-off-by: Ralph Campbell
---
lib/test_hmm.c | 4 ++
lib/test_hmm_uapi.h| 4 ++
tools/testing/selftests/vm/hmm-tests.c | 76 ++
3 files changed, 84
Nouveau currently only supports mapping PAGE_SIZE sized pages of system
memory when shared virtual memory (SVM) is enabled. Use the new
HMM_PFN_PMD flag that hmm_range_fault() returns to support mapping
system memory pages that are PMD_SIZE.
Signed-off-by: Ralph Campbell
---
