igt/vgem_slow/nohang: Test fence autotimeout

To protect the kernel against unscrupulous fence users, fences should
automatically signal after a timeout.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 90 insertions, 0 deletions

diff --git a/tests/vgem_slow.c b/tests/vgem_slow.c
new file mode 100644
index 00000000..4a1ae702
--- /dev/null
+++ b/tests/vgem_slow.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "igt.h"
+#include "igt_vgem.h"
+#include "igt_debugfs.h"
+#include "igt_sysfs.h"
+
+#include <sys/mman.h>
+#include <sys/poll.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+IGT_TEST_DESCRIPTION("Extended sanity check of Virtual GEM module (vGEM).");
+
+static bool has_prime_export(int fd)
+{
+	uint64_t value;
+
+	if (drmGetCap(fd, DRM_CAP_PRIME, &value))
+		return false;
+
+	return value & DRM_PRIME_CAP_EXPORT;
+}
+
+
+static void test_nohang(int fd)
+{
+	struct vgem_bo bo;
+	uint32_t fence;
+	struct pollfd pfd;
+
+	/* A vGEM fence must expire automatically to prevent driver hangs */
+
+	igt_require(has_prime_export(fd));
+	igt_require(vgem_has_fences(fd));
+
+	bo.width = 1;
+	bo.height = 1;
+	bo.bpp = 32;
+	vgem_create(fd, &bo);
+
+	pfd.fd = prime_handle_to_fd(fd, bo.handle);
+	pfd.events = POLLOUT;
+
+	fence = vgem_fence_attach(fd, &bo, 0);
+
+	igt_assert(poll(&pfd, 1, 0) == 0);
+	igt_assert(poll(&pfd, 1, 60*1000) == 1);
+
+	vgem_fence_signal(fd, fence);
+	close(pfd.fd);
+	gem_close(fd, bo.handle);
+}
+
+igt_main
+{
+	int fd = -1;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_VGEM);
+	}
+
+	igt_subtest_f("nohang")
+		test_nohang(fd);
+
+	igt_fixture {
+		close(fd);
+	}
+}