drm/xe/buddy: add compatible and intersects hooks

Copy this from i915. We need .compatible for vram -> vram transfers, so
they don't just get nooped by ttm, if need to move something from
mappable to non-mappble or vice versa. The .intersects is needed for
eviction, to determine if a victim resource is worth eviction. e.g if we
need mappable space there is no point in evicting a resource that has
zero mappable pages.
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_ttm_vram_mgr.c

@@ -242,9 +242,71 @@ static void xe_ttm_vram_mgr_debug(struct ttm_resource_manager *man,
 	drm_printf(printer, "man size:%llu\n", man->size);
 }
 
+static bool xe_ttm_vram_mgr_intersects(struct ttm_resource_manager *man,
+				       struct ttm_resource *res,
+				       const struct ttm_place *place,
+				       size_t size)
+{
+	struct xe_ttm_vram_mgr *mgr = to_xe_ttm_vram_mgr(man);
+	struct xe_ttm_vram_mgr_resource *vres =
+		to_xe_ttm_vram_mgr_resource(res);
+	struct drm_buddy *mm = &mgr->mm;
+	struct drm_buddy_block *block;
+
+	if (!place->fpfn && !place->lpfn)
+		return true;
+
+	if (!place->fpfn && place->lpfn == mgr->visible_size >> PAGE_SHIFT)
+		return vres->used_visible_size > 0;
+
+	list_for_each_entry(block, &vres->blocks, link) {
+		unsigned long fpfn =
+			drm_buddy_block_offset(block) >> PAGE_SHIFT;
+		unsigned long lpfn = fpfn +
+			(drm_buddy_block_size(mm, block) >> PAGE_SHIFT);
+
+		if (place->fpfn < lpfn && place->lpfn > fpfn)
+			return true;
+	}
+
+	return false;
+}
+
+static bool xe_ttm_vram_mgr_compatible(struct ttm_resource_manager *man,
+				       struct ttm_resource *res,
+				       const struct ttm_place *place,
+				       size_t size)
+{
+	struct xe_ttm_vram_mgr *mgr = to_xe_ttm_vram_mgr(man);
+	struct xe_ttm_vram_mgr_resource *vres =
+		to_xe_ttm_vram_mgr_resource(res);
+	struct drm_buddy *mm = &mgr->mm;
+	struct drm_buddy_block *block;
+
+	if (!place->fpfn && !place->lpfn)
+		return true;
+
+	if (!place->fpfn && place->lpfn == mgr->visible_size >> PAGE_SHIFT)
+		return vres->used_visible_size == size;
+
+	list_for_each_entry(block, &vres->blocks, link) {
+		unsigned long fpfn =
+			drm_buddy_block_offset(block) >> PAGE_SHIFT;
+		unsigned long lpfn = fpfn +
+			(drm_buddy_block_size(mm, block) >> PAGE_SHIFT);
+
+		if (fpfn < place->fpfn || lpfn > place->lpfn)
+			return false;
+	}
+
+	return true;
+}
+
 static const struct ttm_resource_manager_func xe_ttm_vram_mgr_func = {
 	.alloc	= xe_ttm_vram_mgr_new,
 	.free	= xe_ttm_vram_mgr_del,
+	.intersects = xe_ttm_vram_mgr_intersects,
+	.compatible = xe_ttm_vram_mgr_compatible,
 	.debug	= xe_ttm_vram_mgr_debug
 };