[Intel-gfx] [PATCH i-g-t 3/3] i915/gem_exec_fence: Avoid long preempt-off sleeps

[Chris Wilson]

The kernel is now enforcing that clients are not allowed to block higher
priority contexts from accessing the GPU; one is no longer allowed to
sleep for a second hogging the GPU. Reduce the sleep down to 50ms, short
enough not to anger the preempt-off checks while long enough for any
ordinary GPU work to complete.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_exec_fence.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/i915/gem_exec_fence.c b/tests/i915/gem_exec_fence.c
index 4e8bdd7b3..002120bf3 100644
--- a/tests/i915/gem_exec_fence.c
+++ b/tests/i915/gem_exec_fence.c
@@ -348,7 +348,8 @@ static void test_fence_await(int fd, unsigned ring, unsigned flags)
 		i++;
 	}
 
-	sleep(1);
+	/* Long, but not too long to anger preemption disable checks */
+	usleep(50 * 1000); /* 50 ms, typical preempt reset is 150+ms */
 
 	/* Check for invalidly completing the task early */
 	igt_assert(fence_busy(spin->out_fence));
-- 
2.24.0