1 files changed, 117 insertions, 0 deletions
diff --git a/lib/i915/gem.c b/lib/i915/gem.c
new file mode 100644
index 00000000..cabd2376
--- /dev/null
+++ b/lib/i915/gem.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2007,2014,2020 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 <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "i915/gem.h"
+#include "igt.h"
+#include "igt_debugfs.h"
+#include "igt_sysfs.h"
+
+static void reset_device(int i915)
+{
+	int dir;
+
+	dir = igt_debugfs_dir(i915);
+	igt_require(dir >= 0);
+
+	if (ioctl(i915, DRM_IOCTL_I915_GEM_THROTTLE)) {
+		igt_info("Found wedged device, trying to reset and continue\n");
+		igt_sysfs_set(dir, "i915_wedged", "-1");
+	}
+	igt_sysfs_set(dir, "i915_next_seqno", "1");
+
+	close(dir);
+}
+
+void igt_require_gem(int i915)
+{
+	int err;
+
+	igt_require_intel(i915);
+
+	/*
+	 * We only want to use the throttle-ioctl for its -EIO reporting
+	 * of a wedged device, not for actually waiting on outstanding
+	 * requests! So create a new drm_file for the device that is clean.
+	 */
+	i915 = gem_reopen_driver(i915);
+
+	/*
+	 * Reset the global seqno at the start of each test. This ensures that
+	 * the test will not wrap unless it explicitly sets up seqno wrapping
+	 * itself, which avoids accidentally hanging when setting up long
+	 * sequences of batches.
+	 */
+	reset_device(i915);
+
+	err = 0;
+	if (ioctl(i915, DRM_IOCTL_I915_GEM_THROTTLE)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	close(i915);
+
+	igt_require_f(err == 0, "Unresponsive i915/GEM device\n");
+}
+
+/**
+ * gem_quiescent_gpu:
+ * @i915: open i915 drm file descriptor
+ *
+ * Ensure the gpu is idle by launching a nop execbuf and stalling for it. This
+ * is automatically run when opening a drm device node and is also installed as
+ * an exit handler to have the best assurance that the test is run in a pristine
+ * and controlled environment.
+ *
+ * This function simply allows tests to make additional calls in-between, if so
+ * desired.
+ */
+void gem_quiescent_gpu(int i915)
+{
+	igt_terminate_spins();
+
+	igt_drop_caches_set(i915,
+			    DROP_ACTIVE | DROP_RETIRE | DROP_IDLE | DROP_FREED);
+}
+
+/**
+ * gem_reopen_driver:
+ * @i915: re-open the i915 drm file descriptor
+ *
+ * Re-opens the drm fd which is useful in instances where a clean default
+ * context is needed.
+ */
+int gem_reopen_driver(int i915)
+{
+	char path[256];
+
+	snprintf(path, sizeof(path), "/proc/self/fd/%d", i915);
+	i915 = open(path, O_RDWR);
+	igt_assert_fd(i915);
+
+	return i915;
+}