[igt-dev] [PATCH i-g-t] i915/gem_ctx_engines: Exercise 0 engines[]

[Chris Wilson]

Setup a context with no engines, and make sure we reject all execution
attempts.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_ctx_engines.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/tests/i915/gem_ctx_engines.c b/tests/i915/gem_ctx_engines.c
index cb82f08ef..063140e0f 100644
--- a/tests/i915/gem_ctx_engines.c
+++ b/tests/i915/gem_ctx_engines.c
@@ -242,6 +242,48 @@ static void idempotent(int i915)
 	gem_context_destroy(i915, p.ctx_id);
 }
 
+static uint32_t batch_create(int i915)
+{
+	const uint32_t bbe = MI_BATCH_BUFFER_END;
+	uint32_t handle = gem_create(i915, 4096);
+
+	gem_write(i915, handle, 0, &bbe, sizeof(bbe));
+	return handle;
+}
+
+static void none(int i915)
+{
+	struct i915_context_param_engines engines = {};
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = gem_context_create(i915),
+		.param = I915_CONTEXT_PARAM_ENGINES,
+		.value = to_user_pointer(&engines),
+		.size = sizeof(engines),
+	};
+
+	gem_context_set_param(i915, &p);
+
+	{
+		struct drm_i915_gem_exec_object2 obj = {
+			.handle = batch_create(i915),
+		};
+		struct drm_i915_gem_execbuffer2 execbuf = {
+			.buffers_ptr = to_user_pointer(&obj),
+			.buffer_count = 1,
+			.rsvd1 = p.ctx_id,
+		};
+
+		for (execbuf.flags = 0;
+		     execbuf.flags <= I915_EXEC_RING_MASK;
+		     execbuf.flags++)
+			igt_assert_eq(__gem_execbuf(i915, &execbuf), -EINVAL);
+
+		gem_close(i915, obj.handle);
+	}
+
+	gem_context_destroy(i915, p.ctx_id);
+}
+
 static void execute_one(int i915)
 {
 	I915_DEFINE_CONTEXT_PARAM_ENGINES(engines , I915_EXEC_RING_MASK + 1);
@@ -527,6 +569,9 @@ igt_main
 	igt_subtest("idempotent")
 		idempotent(i915);
 
+	igt_subtest("none")
+		none(i915);
+
 	igt_subtest("execute-one")
 		execute_one(i915);
 
-- 
2.25.0