[PATCH i-g-t] tests/i915/gem_ctx_switch: Fix I915_EXEC_DEFAULT testing

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Commit ad129d2a583689765eaef31ff57e8cdd219f1d05
("tests/i915/gem_ctx_switch: Update with engine discovery") broke testing
of I915_EXEC_DEFAULT. Bring it back.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxx>
Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
 lib/i915/gem_engine_topology.c | 26 +++++++++++++++++++-------
 lib/i915/gem_engine_topology.h |  3 +--
 tests/i915/gem_ctx_switch.c    |  8 ++++++--
 3 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
index 6cfe3468e3d8..cae5a0292b02 100644
--- a/lib/i915/gem_engine_topology.c
+++ b/lib/i915/gem_engine_topology.c
@@ -290,17 +290,29 @@ bool gem_has_engine_topology(int fd)
 	return !__gem_context_get_param(fd, &param);
 }
 
-const struct intel_execution_engine2 *
-gem_eb_flags_to_engine(unsigned int flags)
+struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags)
 {
-	const struct intel_execution_engine2 *e2;
+	const unsigned int ring = flags & (I915_EXEC_RING_MASK | 3 << 13);
+	struct intel_execution_engine2 e2__ = {
+		.class = -1,
+		.instance = -1,
+		.flags = -1,
+		.name = "invalid"
+	};
+
+	if (ring == I915_EXEC_DEFAULT) {
+		e2__.flags = I915_EXEC_DEFAULT;
+		e2__.name = "default";
+	} else {
+		const struct intel_execution_engine2 *e2;
 
-	__for_each_static_engine(e2) {
-		if (e2->flags == flags)
-			return e2;
+		__for_each_static_engine(e2) {
+			if (e2->flags == ring)
+				return *e2;
+		}
 	}
 
-	return NULL;
+	return e2__;
 }
 
 bool gem_context_has_engine_map(int fd, uint32_t ctx)
diff --git a/lib/i915/gem_engine_topology.h b/lib/i915/gem_engine_topology.h
index b175483fac1c..9b6e2d4f9cd8 100644
--- a/lib/i915/gem_engine_topology.h
+++ b/lib/i915/gem_engine_topology.h
@@ -55,8 +55,7 @@ void gem_context_set_all_engines(int fd, uint32_t ctx);
 
 bool gem_context_has_engine_map(int fd, uint32_t ctx);
 
-const struct intel_execution_engine2 *
-gem_eb_flags_to_engine(unsigned int flags);
+struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags);
 
 #define __for_each_static_engine(e__) \
 	for ((e__) = intel_execution_engines2; (e__)->name; (e__)++)
diff --git a/tests/i915/gem_ctx_switch.c b/tests/i915/gem_ctx_switch.c
index 407905de2d34..c071def7825e 100644
--- a/tests/i915/gem_ctx_switch.c
+++ b/tests/i915/gem_ctx_switch.c
@@ -347,10 +347,14 @@ igt_main
 
 	/* Legacy testing must be first. */
 	for (e = intel_execution_engines; e->name; e++) {
-		e2 = gem_eb_flags_to_engine(e->exec_id | e->flags);
-		if (!e2)
+		struct intel_execution_engine2 e2__;
+
+		e2__ = gem_eb_flags_to_engine(e->exec_id | e->flags);
+		if (e2__.flags == -1)
 			continue; /* I915_EXEC_BSD with no ring selectors */
 
+		e2 = &e2__;
+
 		for (typeof(*phases) *p = phases; p->name; p++) {
 			igt_subtest_group {
 				igt_fixture {
-- 
2.20.1

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