igt/gem_exec_gttfill: Reduce overhead in setting up filler batches

Since all the batches start with the same content, we can reuse the same
buf to fill them.

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

1 files changed, 39 insertions, 0 deletions

diff --git a/lib/igt_rand.h b/lib/igt_rand.h
new file mode 100644
index 00000000..d676752d
--- /dev/null
+++ b/lib/igt_rand.h
@@ -0,0 +1,39 @@
+/*
+ * 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.
+ */
+
+#ifndef IGT_RAND_H
+#define IGT_RAND_H
+
+#include <stdint.h>
+
+uint32_t hars_petruska_f54_1_random_seed(uint32_t seed);
+uint32_t hars_petruska_f54_1_random_unsafe(void);
+
+static inline void hars_petruska_f54_1_random_perturb(uint32_t xor)
+{
+	uint32_t seed = hars_petruska_f54_1_random_seed(0) ^ xor;
+	hars_petruska_f54_1_random_seed(seed);
+	hars_petruska_f54_1_random_seed(hars_petruska_f54_1_random_unsafe());
+}
+
+#endif /* IGT_RAND_H */