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drm/nouveau/nouveau: fix page fault on device private memory

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If system memory is migrated to device private memory and no GPU MMU
page table entry exists, the GPU will fault and call hmm_range_fault()
to get the PFN for the page. Since the .dev_private_owner pointer in
struct hmm_range is not set, hmm_range_fault returns an error which
results in the GPU program stopping with a fatal fault.
Fix this by setting .dev_private_owner appropriately.

Fixes: 08ddddda667b ("mm/hmm: check the device private page owner in hmm_range_fault()")
Cc: stable@vger.kernel.org
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ralph Campbell 2020-06-26 14:03:37 -07:00 committed by Ben Skeggs
parent ad61f5f5e0
commit ed710a6ed7
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/nouveau/nouveau_svm.c
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@ -562,6 +562,7 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
.end = notifier->notifier.interval_tree.last + 1,
.pfn_flags_mask = HMM_PFN_REQ_FAULT | HMM_PFN_REQ_WRITE,
.hmm_pfns = hmm_pfns,
.dev_private_owner = drm->dev,
};
struct mm_struct *mm = notifier->notifier.mm;
int ret;