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nouveau: fix migrate_to_ram() for faulting page

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Commit 16ce101db8 ("mm/memory.c: fix race when faulting a device private
page") changed the migrate_to_ram() callback to take a reference on the
device page to ensure it can't be freed while handling the fault. 
Unfortunately the corresponding update to Nouveau to accommodate this
change was inadvertently dropped from that patch causing GPU to CPU
migration to fail so add it here.

Link: https://lkml.kernel.org/r/20221019122934.866205-1-apopple@nvidia.com
Fixes: 16ce101db8 ("mm/memory.c: fix race when faulting a device private page")
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alistair Popple 2022-10-19 23:29:34 +11:00 committed by Andrew Morton
parent 71e2d666ef
commit 97061d4411
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/nouveau/nouveau_dmem.c
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@ -176,6 +176,7 @@ static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
.src = &src,
.dst = &dst,
.pgmap_owner = drm->dev,
.fault_page = vmf->page,
.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE,
};