[PATCH v4 5/6] lib/xe/xe_query: introduce iterator for GT topology masks

[Andrzej Hajda <andrzej.hajda@intel.com>]

Topology masks returned by device query DRM_XE_DEVICE_QUERY_GT_TOPOLOGY
are placed sequentially in one blob of memory, moreover every mask can
have different size as they contains flexible arrays.

Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Priyanka Dandamudi <priyanka.dandamudi@intel.com>
---
 lib/xe/xe_query.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/xe/xe_query.h b/lib/xe/xe_query.h
index 3e4d73e01b922b47f29731d3cbccc72f67b4c4e1..0e944eb79a18977b015d5baf3da036f55d294a20 100644
--- a/lib/xe/xe_query.h
+++ b/lib/xe/xe_query.h
@@ -97,6 +97,12 @@ struct xe_device {
 #define XE_IS_CLASS_SYSMEM(__region) ((__region)->mem_class == DRM_XE_MEM_REGION_CLASS_SYSMEM)
 #define XE_IS_CLASS_VRAM(__region) ((__region)->mem_class == DRM_XE_MEM_REGION_CLASS_VRAM)
 
+#define xe_for_each_topology_mask(__masks, __size, __mask) \
+	for (__mask = (__masks); \
+	     (void *)__mask->mask - (void *)(__masks) < (__size) && \
+	     (void *)&__mask->mask[__mask->num_bytes] - (void *)(__masks) <= (__size); \
+	     __mask = (void *)&__mask->mask[__mask->num_bytes])
+
 /*
  * Max possible engine instance in drm_xe_engine_class_instance::engine_instance. Only
  * used to declare arrays of drm_xe_engine_class_instance

-- 
2.43.0