drm/i915/stolen: enforce the min_page_size contract

Since stolen can now be device local-memory underneath, we should try to
enforce any min_page_size restrictions when allocating pages.
Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210421104658.304142-3-matthew.auld@intel.com

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

@@ -677,7 +677,8 @@ static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
 	if (!stolen)
 		return -ENOMEM;
 
-	ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096);
+	ret = i915_gem_stolen_insert_node(i915, stolen, size,
+					  mem->min_page_size);
 	if (ret)
 		goto err_free;
 
@@ -836,8 +837,8 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 
 	/* KISS and expect everything to be page-aligned */
 	if (GEM_WARN_ON(size == 0) ||
-	    GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
-	    GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
+	    GEM_WARN_ON(!IS_ALIGNED(size, mem->min_page_size)) ||
+	    GEM_WARN_ON(!IS_ALIGNED(stolen_offset, mem->min_page_size)))
 		return ERR_PTR(-EINVAL);
 
 	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);