drm/nouveau/svm: fix migrate page regression

The patch to add zero page migration to GPU memory inadvertently included
part of a future change which broke normal page migration to GPU memory
by copying too much data and corrupting GPU memory.
Fix this by only copying one page instead of a byte count.

Fixes: 9d4296a7d4b3 ("drm/nouveau/nouveau/hmm: fix migrate zero page to GPU")
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index e5c230d..cc99938 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -550,7 +550,7 @@ static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
                                         DMA_BIDIRECTIONAL);
                if (dma_mapping_error(dev, *dma_addr))
                        goto out_free_page;
-               if (drm->dmem->migrate.copy_func(drm, page_size(spage),
+               if (drm->dmem->migrate.copy_func(drm, 1,
                        NOUVEAU_APER_VRAM, paddr, NOUVEAU_APER_HOST, *dma_addr))
                        goto out_dma_unmap;
        } else {