[igt-dev] [RFC PATCH v4 3/3] tests: gem_exec_basic: add "exec-ctx" buffer execution demo test

[Andi Shyti <andi.shyti@intel.com>]

The "exec-ctx" is a demo subtest inserted in the gem_exec_basic
test. The main scope is to demonstrate an alternative way for
querying engines as implemented in the new API in commit 87079e04
("lib: implement new engine discovery interface").

The "exec-ctx" subtest simply gets the list of engines, binds
them to a context and executes a buffer. This is done through a
new "for_each_engine_ctx" loop which iterates through the
engines.

Signed-off-by: Andi Shyti <andi.shyti@intel.com>
---
 tests/i915/gem_exec_basic.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tests/i915/gem_exec_basic.c b/tests/i915/gem_exec_basic.c
index dcb83864b1c1..2b09f8cd79b7 100644
--- a/tests/i915/gem_exec_basic.c
+++ b/tests/i915/gem_exec_basic.c
@@ -114,6 +114,22 @@ static void gtt(int fd, unsigned ring)
 	munmap(execbuf, 4096);
 }
 
+static void execbuf_in_ctx(int fd, struct intel_execution_engine2 *engine,
+			   uint32_t ctx, uint32_t handle)
+{
+	struct drm_i915_gem_exec_object2 exec = {
+		.handle = handle,
+	};
+	struct drm_i915_gem_execbuffer2 execbuf = {
+		.buffers_ptr = to_user_pointer(&exec),
+		.buffer_count = 1,
+		.flags = engine->map_index,
+		.rsvd1 = ctx,
+	};
+
+	gem_execbuf(fd, &execbuf);
+}
+
 igt_main
 {
 	const struct intel_execution_engine *e;
@@ -135,6 +151,23 @@ igt_main
 			gtt(fd, e->exec_id | e->flags);
 	}
 
+	igt_subtest("exec-ctx") {
+		uint32_t ctx_id;
+		uint32_t handle;
+		uint32_t bbend = MI_BATCH_BUFFER_END;
+		struct intel_execution_engine2 *e2;
+
+		ctx_id = gem_context_create(fd);
+		handle = gem_create(fd, 4096);
+		gem_write(fd, handle, 0, &bbend, sizeof(bbend));
+
+		for_each_engine_ctx(fd, ctx_id, e2)
+			execbuf_in_ctx(fd, e2, ctx_id, handle);
+
+		gem_close(fd, handle);
+		gem_context_destroy(fd, ctx_id);
+	}
+
 	igt_fixture {
 		igt_stop_hang_detector();
 		close(fd);
-- 
2.20.1

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