drm/amdgpu: stop allocating a page array for prime shared BOs

We don't need the page array for prime shared BOs, stop allocating it.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NRoger He <Hongbo.He@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c

@@ -315,7 +315,7 @@ int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
 	t = offset / AMDGPU_GPU_PAGE_SIZE;
 	p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
 	for (i = 0; i < pages; i++, p++)
-		adev->gart.pages[p] = pagelist[i];
+		adev->gart.pages[p] = pagelist ? pagelist[i] : NULL;
 #endif
 
 	if (!adev->gart.ptr)

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -995,7 +995,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
 		return NULL;
 	}
 	gtt->ttm.ttm.func = &amdgpu_backend_func;
-	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
+	if (ttm_sg_tt_init(&gtt->ttm, bdev, size, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
@@ -1021,7 +1021,8 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
 
 	if (slave && ttm->sg) {
 		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
-						 gtt->ttm.dma_address, ttm->num_pages);
+						 gtt->ttm.dma_address,
+						 ttm->num_pages);
 		ttm->state = tt_unbound;
 		return 0;
 	}