drm/i915/ttm: restore min_page_size behaviour

We now have bo->page_alignment which perfectly describes what we need if
we have min page size restrictions for lmem. We can also drop the flag
here, since this is the default behaviour for all objects.

v2(Thomas):
    - bo->page_alignment is in page units
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210616152501.394518-7-matthew.auld@intel.com

drivers/gpu/drm/i915/gem/i915_gem_ttm.c

@@ -672,9 +672,9 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	 */
 	obj->base.vma_node.driver_private = i915_gem_to_ttm(obj);
 	ret = ttm_bo_init(&i915->bdev, i915_gem_to_ttm(obj), size,
-			  bo_type, &i915_sys_placement, 1,
+			  bo_type, &i915_sys_placement,
+			  mem->min_page_size >> PAGE_SHIFT,
 			  true, NULL, NULL, i915_ttm_bo_destroy);
-
 	if (!ret)
 		obj->ttm.created = true;
 

drivers/gpu/drm/i915/intel_memory_region.h

@@ -40,8 +40,7 @@ enum intel_region_id {
 #define REGION_STOLEN_SMEM   BIT(INTEL_REGION_STOLEN_SMEM)
 #define REGION_STOLEN_LMEM   BIT(INTEL_REGION_STOLEN_LMEM)
 
-#define I915_ALLOC_MIN_PAGE_SIZE  BIT(0)
-#define I915_ALLOC_CONTIGUOUS     BIT(1)
+#define I915_ALLOC_CONTIGUOUS     BIT(0)
 
 #define for_each_memory_region(mr, i915, id) \
 	for (id = 0; id < ARRAY_SIZE((i915)->mm.regions); id++) \

drivers/gpu/drm/i915/intel_region_ttm.c

@@ -167,7 +167,7 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
 	int ret;
 
 	mock_bo.base.size = size;
-	mock_bo.page_alignment = 1;
+	mock_bo.page_alignment = mem->min_page_size >> PAGE_SHIFT;
 	place.flags = flags;
 
 	ret = man->func->alloc(man, &mock_bo, &place, &res);

drivers/gpu/drm/i915/selftests/mock_region.c

@@ -28,7 +28,7 @@ static int mock_region_get_pages(struct drm_i915_gem_object *obj)
 	struct sg_table *pages;
 	int err;
 
-	flags = I915_ALLOC_MIN_PAGE_SIZE;
+	flags = 0;
 	if (obj->flags & I915_BO_ALLOC_CONTIGUOUS)
 		flags |= TTM_PL_FLAG_CONTIGUOUS;