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mm/hmm: change hmm_vma_fault() to allow write fault on page basis

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This changes hmm_vma_fault() to not take a global write fault flag for a
range but instead rely on caller to populate HMM pfns array with proper
fault flag ie HMM_PFN_VALID if driver want read fault for that address or
HMM_PFN_VALID and HMM_PFN_WRITE for write.

Moreover by setting HMM_PFN_DEVICE_PRIVATE the device driver can ask for
device private memory to be migrated back to system memory through page
fault.

This is more flexible API and it better reflects how device handles and
reports fault.

Link: http://lkml.kernel.org/r/20180323005527.758-15-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Mark Hairgrove <mhairgrove@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jérôme Glisse
2018-04-10 16:29:02 -07:00
committed by Linus Torvalds
parent 53f5c3f489
commit 2aee09d8c1
2 changed files with 119 additions and 34 deletions
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2
include/linux/hmm.h
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@@ -317,7 +317,7 @@ bool hmm_vma_range_done(struct hmm_range *range);
*
* See the function description in mm/hmm.c for further documentation.
*/
int hmm_vma_fault(struct hmm_range *range, bool write, bool block);
int hmm_vma_fault(struct hmm_range *range, bool block);
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */