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drm/nouveau/svm: check for SVM initialized before migrating

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When migrating system memory to GPU memory, check that SVM has been
enabled. Even though most errors can be ignored since migration is
a performance optimization, return an error because this is a violation
of the API.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ralph Campbell 2020-03-03 16:13:37 -08:00 • committed by Ben Skeggs
parent b92103b559
commit 822cab6150
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/nouveau/nouveau_svm.c
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@ -171,6 +171,11 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
mm = get_task_mm(current); mm = get_task_mm(current);
down_read(&mm->mmap_sem); down_read(&mm->mmap_sem);
if (!cli->svm.svmm) {
up_read(&mm->mmap_sem);
return -EINVAL;
}
for (addr = args->va_start, end = args->va_start + size; addr < end;) { for (addr = args->va_start, end = args->va_start + size; addr < end;) {
struct vm_area_struct *vma; struct vm_area_struct *vma;
unsigned long next; unsigned long next;