diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 4f861782c3e8..7a1e92c11946 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -649,7 +649,7 @@ bool i915_ttm_resource_mappable(struct ttm_resource *res)
 	if (!i915_ttm_cpu_maps_iomem(res))
 		return true;
 
-	return bman_res->used_visible_size == bman_res->base.num_pages;
+	return bman_res->used_visible_size == PFN_UP(bman_res->base.size);
 }
 
 static int i915_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c
index dcc081874ec8..114e5e39aa72 100644
--- a/drivers/gpu/drm/i915/i915_scatterlist.c
+++ b/drivers/gpu/drm/i915/i915_scatterlist.c
@@ -158,7 +158,7 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
 						     u32 page_alignment)
 {
 	struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
-	const u64 size = res->num_pages << PAGE_SHIFT;
+	const u64 size = res->size;
 	const u32 max_segment = round_down(UINT_MAX, page_alignment);
 	struct drm_buddy *mm = bman_res->mm;
 	struct list_head *blocks = &bman_res->blocks;
@@ -177,7 +177,7 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
 
 	i915_refct_sgt_init(rsgt, size);
 	st = &rsgt->table;
-	if (sg_alloc_table(st, res->num_pages, GFP_KERNEL)) {
+	if (sg_alloc_table(st, PFN_UP(res->size), GFP_KERNEL)) {
 		i915_refct_sgt_put(rsgt);
 		return ERR_PTR(-ENOMEM);
 	}
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index e19452f0e100..7e611476c7a4 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -62,8 +62,8 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
 	if (place->fpfn || lpfn != man->size)
 		bman_res->flags |= DRM_BUDDY_RANGE_ALLOCATION;
 
-	GEM_BUG_ON(!bman_res->base.num_pages);
-	size = bman_res->base.num_pages << PAGE_SHIFT;
+	GEM_BUG_ON(!bman_res->base.size);
+	size = bman_res->base.size;
 
 	min_page_size = bman->default_page_size;
 	if (bo->page_alignment)
@@ -72,7 +72,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
 	GEM_BUG_ON(min_page_size < mm->chunk_size);
 	GEM_BUG_ON(!IS_ALIGNED(size, min_page_size));
 
-	if (place->fpfn + bman_res->base.num_pages != place->lpfn &&
+	if (place->fpfn + PFN_UP(bman_res->base.size) != place->lpfn &&
 	    place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 		unsigned long pages;
 
@@ -108,7 +108,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
 		goto err_free_blocks;
 
 	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
-		u64 original_size = (u64)bman_res->base.num_pages << PAGE_SHIFT;
+		u64 original_size = (u64)bman_res->base.size;
 
 		drm_buddy_block_trim(mm,
 				     original_size,
@@ -116,7 +116,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
 	}
 
 	if (lpfn <= bman->visible_size) {
-		bman_res->used_visible_size = bman_res->base.num_pages;
+		bman_res->used_visible_size = PFN_UP(bman_res->base.size);
 	} else {
 		struct drm_buddy_block *block;
 
@@ -228,7 +228,7 @@ static bool i915_ttm_buddy_man_compatible(struct ttm_resource_manager *man,
 
 	if (!place->fpfn &&
 	    place->lpfn == i915_ttm_buddy_man_visible_size(man))
-		return bman_res->used_visible_size == res->num_pages;
+		return bman_res->used_visible_size == PFN_UP(res->size);
 
 	/* Check each drm buddy block individually */
 	list_for_each_entry(block, &bman_res->blocks, link) {
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
index 575d67bc6ffe..cf89d0c2a2d9 100644
--- a/drivers/gpu/drm/i915/intel_region_ttm.c
+++ b/drivers/gpu/drm/i915/intel_region_ttm.c
@@ -244,7 +244,7 @@ void intel_region_ttm_resource_free(struct intel_memory_region *mem,
 	struct ttm_resource_manager *man = mem->region_private;
 	struct ttm_buffer_object mock_bo = {};
 
-	mock_bo.base.size = res->num_pages << PAGE_SHIFT;
+	mock_bo.base.size = res->size;
 	mock_bo.bdev = &mem->i915->bdev;
 	res->bo = &mock_bo;
 
