[PATCH 2/2] igt/gem_reset_stats: Add time constraints on hang detection

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

Make sure that injected hang is detected below time threshold.
This ensures that we fail if hang was of no-progress type instead
of a stuck engine.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 tests/gem_reset_stats.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tests/gem_reset_stats.c b/tests/gem_reset_stats.c
index 27bc6c9cfb59..74c102d3fd7d 100644
--- a/tests/gem_reset_stats.c
+++ b/tests/gem_reset_stats.c
@@ -148,6 +148,23 @@ static int gem_reset_status(int fd, int ctx_id)
 	return RS_NO_ERROR;
 }
 
+static struct timespec ts_injected;
+
+static double elapsed(const struct timespec *start, const struct timespec *end)
+{
+	return ((end->tv_sec - start->tv_sec) +
+		(end->tv_nsec - start->tv_nsec)*1e-9);
+}
+
+static double elapsed_from_hang_injection(void)
+{
+	struct timespec now;
+
+	clock_gettime(CLOCK_MONOTONIC, &now);
+
+	return elapsed(&ts_injected, &now);
+}
+
 #define BAN HANG_ALLOW_BAN
 #define ASYNC 2
 static void inject_hang(int fd, uint32_t ctx,
@@ -156,6 +173,8 @@ static void inject_hang(int fd, uint32_t ctx,
 {
 	igt_hang_ring_t hang;
 
+	clock_gettime(CLOCK_MONOTONIC, &ts_injected);
+
 	hang = igt_hang_ctx(fd, ctx, e->exec_id | e->flags, flags & BAN, NULL);
 	if ((flags & ASYNC) == 0)
 		igt_post_hang_ring(fd, hang);
@@ -238,6 +257,8 @@ static void test_rs(const struct intel_execution_engine *e,
 			assert_reset_status(i, fd[i], 0, RS_BATCH_PENDING);
 	}
 
+	igt_assert(elapsed_from_hang_injection() < 31.0);
+
 	for (i = 0; i < num_fds; i++)
 		close(fd[i]);
 }
@@ -290,6 +311,8 @@ static void test_rs_ctx(const struct intel_execution_engine *e,
 	}
 	sync_gpu();
 
+	igt_assert(elapsed_from_hang_injection() < 31.0);
+
 	for (i = 0; i < num_fds; i++)
 		assert_reset_status(i, fd[i], 0, RS_NO_ERROR);
 
-- 
2.7.4

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