[Intel-gfx] [PATCH i-g-t 2/3] tests/gem_exec_schedule: Add reset on failed preemption test.

[Antonio Argenziano]

This patch adds a test where a low priority batch is going to be
declared hung while a preemption is pending. The test wants to verify
that a 'bad' low priority batch will not disrupt the execution of a high
priority context and that the driver does due diligence in managing a
reset while a preemption is pending.

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Michal Winiarski <michal.winiarski at intel.com>
Signed-off-by: Antonio Argenziano <antonio.argenziano at intel.com>
---
 tests/gem_exec_schedule.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index 1e6b0ae7..ae44a6c0 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -356,7 +356,8 @@ static void promotion(int fd, unsigned ring)
 	munmap(ptr, 4096);
 }
 
-#define NEW_CTX 0x1
+#define NEW_CTX (0x1 << 0)
+#define HANG_LP (0x1 << 1)
 static void preempt(int fd, unsigned ring, unsigned flags)
 {
 	uint32_t result = gem_create(fd, 4096);
@@ -370,6 +371,9 @@ static void preempt(int fd, unsigned ring, unsigned flags)
 	ctx[HI] = gem_context_create(fd);
 	gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
 
+	if (flags & HANG_LP)
+		igt_spin_batch_new(fd, ctx[LO], ring, 0, false);
+
 	for (int n = 0; n < 16; n++) {
 		if (flags & NEW_CTX) {
 			gem_context_destroy(fd, ctx[LO]);
@@ -1023,6 +1027,12 @@ igt_main
 
 					igt_subtest_f("preempt-self-%s", e->name)
 						preempt_self(fd, e->exec_id | e->flags);
+
+					igt_subtest_f("preempt-bad-%s", e->name) {
+						igt_stop_hang_detector();
+						preempt(fd, e->exec_id | e->flags, NEW_CTX | HANG_LP);
+						igt_fork_hang_detector(fd);
+					}
 				}
 
 				igt_subtest_f("deep-%s", e->name)
-- 
2.14.2