[PATCH] tests/gem_reset_stats: add defer-hangcheck test

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

to see if one can fool hangcheck by keeping non hanging
ring busy

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 tests/gem_reset_stats.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/tests/gem_reset_stats.c b/tests/gem_reset_stats.c
index 3f5a01f..6473cf3 100644
--- a/tests/gem_reset_stats.c
+++ b/tests/gem_reset_stats.c
@@ -1019,6 +1019,45 @@ static void test_params(void)
 
 }
 
+static void defer_hangcheck(int ring_num)
+{
+	int fd, count_start, count_end;
+	int seconds = 30;
+	const struct target_ring *next_ring;
+	fd = drm_open_any();
+	igt_assert(fd >= 0);
+
+	do {
+		next_ring = &rings[(++ring_num) % NUM_RINGS];
+
+		if (next_ring->present(fd))
+			break;
+
+	} while(next_ring != current_ring);
+
+	igt_skip_on(next_ring == current_ring);
+
+	count_start = get_reset_count(fd, 0);
+	igt_assert(count_start >= 0);
+
+	igt_assert(inject_hang_ring(fd, 0, current_ring->exec, true));
+	while (--seconds) {
+		igt_assert(exec_valid_ring(fd, 0, next_ring->exec));
+
+		count_end = get_reset_count(fd, 0);
+		igt_assert(count_end >= 0);
+
+		if (count_end > count_start)
+			return;
+
+		sleep(1);
+	}
+
+	igt_assert(count_end > count_start);
+
+	close(fd);
+}
+
 static bool gem_has_hw_contexts(int fd)
 {
 	struct local_drm_i915_gem_context_create create;
@@ -1159,5 +1198,9 @@ igt_main
 
 		igt_subtest_f("close-pending-fork-reverse-%s", name)
 			RUN_TEST(test_close_pending_fork(true));
+
+		igt_subtest_f("defer-hangcheck-%s", name)
+			RUN_TEST(defer_hangcheck(i));
+
 	}
 }
-- 
1.9.1

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