[PATCH i-g-t 1/3] tests/intel/xe_oa: Fix __for_one_render_engine

[Ashutosh Dixit <ashutosh.dixit@intel.com>]

On platforms without render engines, __for_one_render_engine is an infinite
loop. Fix and simplify the macro to reduce chance of such errors in the
future.

Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
---
 tests/intel/xe_oa.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/tests/intel/xe_oa.c b/tests/intel/xe_oa.c
index 9bc62c5b9d..245481f8a3 100644
--- a/tests/intel/xe_oa.c
+++ b/tests/intel/xe_oa.c
@@ -430,6 +430,18 @@ static u64 oa_format_fields(u64 name)
 }
 #define __ff oa_format_fields
 
+static struct drm_xe_engine_class_instance *hwe_of_class(int fd, int class)
+{
+	struct drm_xe_engine_class_instance *hwe;
+
+	for (int m = 0; m < xe_number_engines(fd); m++) {
+		hwe = &xe_engine(drm_fd, m)->instance;
+		if (hwe->engine_class == class)
+			return hwe;
+	}
+	return NULL;
+}
+
 static struct drm_xe_engine_class_instance *oa_unit_engine(int fd, int n)
 {
 	struct drm_xe_query_oa_units *qoa = xe_oa_units(fd);
@@ -4645,13 +4657,10 @@ static const char *xe_engine_class_name(uint32_t engine_class)
 		igt_dynamic_f("%s-%d-%s", xe_engine_class_name(hwe->engine_class), \
 			      hwe->engine_instance, str)
 
-#define __for_one_render_engine(hwe)	      \
-	for (int m = 0, done = 0; !done; m++) \
-		for_each_if(m < xe_number_engines(drm_fd) && \
-			    (hwe = &xe_engine(drm_fd, m)->instance) && \
-			    hwe->engine_class == DRM_XE_ENGINE_CLASS_RENDER && \
-			    (done = 1)) \
-			igt_dynamic_f("rcs-%d", hwe->engine_instance)
+#define __for_one_render_engine(hwe) \
+	hwe = hwe_of_class(drm_fd, DRM_XE_ENGINE_CLASS_RENDER); \
+	igt_require_f(hwe, "no render engine\n"); \
+	igt_dynamic_f("rcs-%d", hwe->engine_instance)
 
 igt_main
 {
@@ -4895,10 +4904,10 @@ igt_main
 		}
 
 		for (const struct sync_section *s = sync_sections; s->name; s++) {
-			igt_subtest_with_dynamic_f("syncs-%s", s->name)
+			igt_subtest_with_dynamic_f("syncs-%s", s->name) {
 				__for_one_render_engine(hwe)
 					test_syncs(hwe, s->sync_type, s->flags);
-
+			}
 		}
 	}
 
-- 
2.48.1