igt/gem_concurrent_blit: Inject hangs before verifying contents

After setting up the copy operations, add a hanging batch. This should
mean that we complete the copy and the compare then races against the
GEM reset. Hopefully, this will catch driver bugs where the target
object is no longer accessible after the hang.

Note: hang injection is disabled until the required kernel interface is
completed. But there are useful additional tests here...

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

1 files changed, 109 insertions, 0 deletions

diff --git a/lib/igt_gt.c b/lib/igt_gt.c
new file mode 100644
index 00000000..526cbee0
--- /dev/null
+++ b/lib/igt_gt.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright © 2014 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 <string.h>
+#include <errno.h>
+
+#include "igt_core.h"
+#include "igt_gt.h"
+#include "igt_debugfs.h"
+#include "ioctl_wrappers.h"
+#include "intel_reg.h"
+
+int igt_can_hang_ring(int fd, int gen, int ring)
+{
+	if (!gem_context_has_param(fd, LOCAL_CONTEXT_PARAM_BAN_PERIOD))
+		return 0;
+
+	if (gen < 5) /* safe resets */
+		return 0;
+
+	return 1;
+}
+
+struct igt_hang_ring igt_hang_ring(int fd, int gen, int ring)
+{
+	struct drm_i915_gem_relocation_entry reloc;
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 exec;
+	struct local_i915_gem_context_param param;
+	uint32_t b[8];
+	unsigned ban;
+	unsigned len;
+
+	param.context = 0;
+	param.size = 0;
+	param.param = LOCAL_CONTEXT_PARAM_BAN_PERIOD;
+	param.value = 0;
+	gem_context_get_param(fd, &param);
+	ban = param.value;
+
+	param.value = 0;
+	igt_require(gem_context_set_param(fd, &param) == 0);
+
+	memset(&reloc, 0, sizeof(reloc));
+	memset(&exec, 0, sizeof(exec));
+	memset(&execbuf, 0, sizeof(execbuf));
+
+	exec.handle = gem_create(fd, 4096);
+	exec.relocation_count = 1;
+	exec.relocs_ptr = (uintptr_t)&reloc;
+
+	len = 2;
+	if (gen >= 8)
+		len++;
+	b[0] = MI_BATCH_BUFFER_START | (len - 2);
+	b[len] = MI_BATCH_BUFFER_END;
+	b[len+1] = MI_NOOP;
+	gem_write(fd, exec.handle, 0, b, sizeof(b));
+
+	reloc.offset = 4;
+	reloc.target_handle = exec.handle;
+	reloc.read_domains = I915_GEM_DOMAIN_COMMAND;
+
+	execbuf.buffers_ptr = (uintptr_t)&exec;
+	execbuf.buffer_count = 1;
+	execbuf.batch_len = sizeof(b);
+	execbuf.flags = ring;
+	gem_execbuf(fd, &execbuf);
+
+	return (struct igt_hang_ring){ exec.handle, ban };
+}
+
+void igt_post_hang_ring(int fd, struct igt_hang_ring arg)
+{
+	struct local_i915_gem_context_param param;
+
+	if (arg.handle == 0)
+		return;
+
+	gem_set_domain(fd, arg.handle,
+		       I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+	gem_close(fd, arg.handle);
+
+	param.context = 0;
+	param.size = 0;
+	param.param = LOCAL_CONTEXT_PARAM_BAN_PERIOD;
+	param.value = arg.ban;
+	gem_context_set_param(fd, &param);
+}