drm/xe: Add for_each_tile iterator

As we start splitting tile handling out from GT handling, we'll need to
be able to iterate over tiles separately from GTs.  This iterator will
be used in upcoming patches.

v2:
 - s/(id__++)/(id__)++/  (Gustavo)

Cc: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://lore.kernel.org/r/20230601215244.678611-6-matthew.d.roper@intel.comSigned-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device.h

@@ -83,6 +83,10 @@ static inline void xe_device_guc_submission_disable(struct xe_device *xe)
 	xe->info.enable_guc = false;
 }
 
+#define for_each_tile(tile__, xe__, id__) \
+	for ((id__) = 0; (id__) < (xe__)->info.tile_count; (id__)++) \
+		for_each_if ((tile__) = &(xe__)->tiles[(id__)])
+
 #define for_each_gt(gt__, xe__, id__) \
 	for ((id__) = 0; (id__) < (xe__)->info.tile_count; (id__++)) \
 		for_each_if ((gt__) = xe_device_get_gt((xe__), (id__)))

drivers/gpu/drm/xe/xe_pci.c

@@ -537,8 +537,7 @@ static int xe_info_init(struct xe_device *xe,
 	 */
 	xe->info.tile_count = 1 + graphics_desc->max_remote_tiles;
 
-	for (id = 0; id < xe->info.tile_count; ++id) {
-		tile = &xe->tiles[id];
+	for_each_tile(tile, xe, id) {
 		tile->xe = xe;
 		tile->id = id;