Don't just wait for the batch to be completed, wait for the system to
idle! Then wake it up and do it again.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
tests/gem_sync.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/tests/gem_sync.c b/tests/gem_sync.c
index ad43b1a3..d70515ea 100644
--- a/tests/gem_sync.c
+++ b/tests/gem_sync.c
@@ -152,6 +152,45 @@ sync_ring(int fd, unsigned ring, int num_children, int
timeout)
igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}
+static void
+idle_ring(int fd, unsigned ring, int timeout)
+{
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 object;
+ struct drm_i915_gem_execbuffer2 execbuf;
+ double start, elapsed;
+ unsigned long cycles;
+
+ gem_require_ring(fd, ring);
+
+ memset(&object, 0, sizeof(object));
+ object.handle = gem_create(fd, 4096);
+ gem_write(fd, object.handle, 0, &bbe, sizeof(bbe));
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ execbuf.buffers_ptr = to_user_pointer(&object);
+ execbuf.buffer_count = 1;
+ execbuf.flags = ring;
+ gem_execbuf(fd, &execbuf);
+ gem_sync(fd, object.handle);
+
+ intel_detect_and_clear_missed_interrupts(fd);
+ start = gettime();
+ cycles = 0;
+ do {
+ do {
+ gem_execbuf(fd, &execbuf);
+ gem_quiescent_gpu(fd);
+ } while (++cycles & 1023);
+ } while ((elapsed = gettime() - start) < timeout);
+ igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
+
+ igt_info("Completed %ld cycles: %.3f us\n",
+ cycles, elapsed*1e6/cycles);
+
+ gem_close(fd, object.handle);
+}
+
static void
store_ring(int fd, unsigned ring, int num_children, int timeout)
{
@@ -802,6 +841,8 @@ igt_main
for (e = intel_execution_engines; e->name; e++) {
igt_subtest_f("%s", e->name)
sync_ring(fd, e->exec_id | e->flags, 1, 150);
+ igt_subtest_f("idle-%s", e->name)
+ idle_ring(fd, e->exec_id | e->flags, 150);
igt_subtest_f("store-%s", e->name)
store_ring(fd, e->exec_id | e->flags, 1, 150);
igt_subtest_f("many-%s", e->name)
--
2.16.1
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