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nouveau/svm: Fix to migrate all requested pages

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Users may request that pages from an OpenCL SVM allocation be migrated
to the GPU with clEnqueueSVMMigrateMem(). In Nouveau this will call into
nouveau_dmem_migrate_vma() to do the migration. If the total range to be
migrated exceeds SG_MAX_SINGLE_ALLOC the pages will be migrated in
chunks of size SG_MAX_SINGLE_ALLOC. However a typo in updating the
starting address means that only the first chunk will get migrated.

Fix the calculation so that the entire range will get migrated if
possible.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
Fixes: e3d8b08904 ("drm/nouveau/svm: map pages after migration")
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220720062745.960701-1-apopple@nvidia.com
Cc: <stable@vger.kernel.org> # v5.8+
This commit is contained in:
Alistair Popple 2022-07-20 16:27:45 +10:00 committed by Lyude Paul
parent 0c09bc33aa
commit 66cee9097e
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/nouveau/nouveau_dmem.c
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@ -680,7 +680,11 @@ nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
goto out_free_dma;
for (i = 0; i < npages; i += max) {
args.end = start + (max << PAGE_SHIFT);
if (args.start + (max << PAGE_SHIFT) > end)
args.end = end;
else
args.end = args.start + (max << PAGE_SHIFT);
ret = migrate_vma_setup(&args);
if (ret)
goto out_free_pfns;