lib/sw_sync: Add igt_require_sw_sync to enable skipping on no sw_sync support

Add igt_require_sw_sync to provide tests to skip if sw_sync support isn't
available on the host machine.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/sw_sync.c b/lib/sw_sync.c
index aa8feefe..276dc795 100644
--- a/lib/sw_sync.c
+++ b/lib/sw_sync.c
@@ -212,3 +212,17 @@ int sync_fence_count_status(int fd, int status)
 
 	return count;
 }
+
+static bool kernel_has_sw_sync(void)
+{
+	char buf[128];
+
+	igt_ignore_warn(system("/sbin/modprobe -s r sw_sync"));
+
+	return kernel_sw_sync_path(buf, sizeof(buf));
+}
+
+void igt_require_sw_sync(void)
+{
+	igt_require(kernel_has_sw_sync());
+}