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SubjectRe: [PATCH v3 0/5] mm/hmm/nouveau: add PMD system memory mapping
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On 7/10/20 12:27 PM, Jason Gunthorpe wrote:
> On Wed, Jul 01, 2020 at 03:53:47PM -0700, Ralph Campbell wrote:
>> The goal for this series is to introduce the hmm_pfn_to_map_order()
>> function. This allows a device driver to know that a given 4K PFN is
>> actually mapped by the CPU using a larger 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 v3:
>> Replaced the HMM_PFN_P[MU]D flags with hmm_pfn_to_map_order() to
>> indicate the size of the CPU mapping.
>>
>> 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 hmm_mapping order
>> nouveau: fix mapping 2MB sysmem pages
>> nouveau/hmm: support mapping large sysmem pages
>> hmm: add tests for HMM_PFN_PMD flag
>
> Applied to hmm.git.
>
> I edited the comment for hmm_pfn_to_map_order() and added a function
> to compute the field.
>
> Thanks,
> Jason

Looks good, thanks.

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