[PATCH] tests/wait render timeout test

[Ben Widawsky <ben@bwidawsk.net>]

Assures that signals interrupting the wait works properly. Because of
the scheduling around signals, interrupted waits will *seem* faster as
the GPU continues to work while all the CPU scheduling stuff happens.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 tests/Makefile.am               |    3 +
 tests/gem_wait_render_timeout.c |  155 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 tests/gem_wait_render_timeout.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 18caf78..8dcf416 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -63,6 +63,7 @@ TESTS_progs = \
 	drm_vma_limiter_cached \
 	sysfs_rc6_residency \
 	flip_test \
+	gem_wait_render_timeout \
 	$(NULL)
 
 # IMPORTANT: The ZZ_ tests need to be run last!
@@ -116,3 +117,5 @@ AM_CFLAGS += $(CAIRO_CFLAGS) $(LIBUDEV_CFLAGS) $(GLIB_CFLAGS)
 
 gem_fence_thrash_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gem_fence_thrash_LDADD = $(LDADD) -lpthread
+
+gem_wait_render_timeout_LDADD = $(LDADD) -lrt
diff --git a/tests/gem_wait_render_timeout.c b/tests/gem_wait_render_timeout.c
new file mode 100644
index 0000000..8edfc43
--- /dev/null
+++ b/tests/gem_wait_render_timeout.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright © 2012 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.
+ *
+ * Authors:
+ *    Ben Widawsky <ben@bwidawsk.net>
+ *
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include "drm.h"
+#include "rendercopy.h"
+
+#define MSEC_PER_SEC	1000L
+#define USEC_PER_MSEC	1000L
+#define NSEC_PER_USEC	1000L
+#define NSEC_PER_MSEC	1000000L
+#define USEC_PER_SEC	1000000L
+#define NSEC_PER_SEC	1000000000L
+
+#define ENOUGH_WORK_IN_SECONDS 2
+#define BUF_SIZE (8<<20)
+#define BUF_PAGES ((8<<20)>>12)
+drm_intel_bo *dst, *dst2;
+
+/* returns time diff in milliseconds */
+static int64_t
+do_time_diff(struct timespec *end, struct timespec *start)
+{
+	int64_t ret;
+	ret = (NSEC_PER_MSEC * difftime(end->tv_sec, start->tv_sec)) +
+	      ((end->tv_nsec/NSEC_PER_MSEC) - (start->tv_nsec/NSEC_PER_MSEC));
+	return ret;
+}
+
+
+static void blt_color_fill(struct intel_batchbuffer *batch,
+			   drm_intel_bo *buf,
+			   const unsigned int pages)
+{
+	const unsigned short height = pages;
+	const unsigned short width =  4096;
+	BEGIN_BATCH(5);
+	OUT_BATCH(COLOR_BLT_CMD		|
+		  COLOR_BLT_WRITE_ALPHA	|
+		  COLOR_BLT_WRITE_RGB);
+	OUT_BATCH((3 << 24)	| /* 32 Bit Color */
+		  0xF0		| /* Raster OP copy background register */
+		  0);		  /* Dest pitch is 0 */
+	OUT_BATCH(width << 16	|
+		  height);
+	OUT_RELOC(buf, I915_GEM_DOMAIN_RENDER, 0, 0);
+	OUT_BATCH(rand()); /* random pattern */
+	ADVANCE_BATCH();
+}
+
+int main(int argc, char **argv)
+{
+	drm_intel_bufmgr *bufmgr;
+	struct intel_batchbuffer *batch;
+	uint64_t timeout = ENOUGH_WORK_IN_SECONDS * NSEC_PER_SEC;
+	int fd, ret;
+	const bool do_signals = true; /* signals will seem to make the operation
+				       * use less process CPU time */
+	bool done = false;
+	int i, iter = 0x100;
+
+	fd = drm_open_any();
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+	batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
+
+	dst = drm_intel_bo_alloc(bufmgr, "dst", BUF_SIZE, 4096);
+	dst2 = drm_intel_bo_alloc(bufmgr, "dst2", BUF_SIZE, 4096);
+
+	/* Figure out a rough number of fills required to consume 1 second of
+	 * GPU work.
+	 */
+	do {
+		struct timespec start, end;
+		long diff;
+
+		assert(clock_gettime(CLOCK_MONOTONIC_RAW, &start) == 0);
+		for (i = 0; i < iter; i++)
+			blt_color_fill(batch, dst, BUF_PAGES);
+		intel_batchbuffer_flush(batch);
+		drm_intel_bo_wait_rendering(dst);
+		assert(clock_gettime(CLOCK_MONOTONIC_RAW, &end) == 0);
+
+		diff = do_time_diff(&end, &start);
+		assert(diff >= 0);
+
+		if ((diff / MSEC_PER_SEC) > ENOUGH_WORK_IN_SECONDS)
+			done = true;
+		else
+			iter <<= 1;
+	} while (!done && iter < 1000000);
+
+	assert(iter < 1000000);
+
+	printf("%d iters is enough work\n", iter);
+	gem_quiescent_gpu(fd);
+	if (do_signals)
+		drmtest_fork_signal_helper();
+	/* We should be able to do half as much work in the same amount of time */
+	for (i = 0; i < iter; i++)
+		blt_color_fill(batch, dst2, BUF_PAGES);
+
+	intel_batchbuffer_flush(batch);
+
+	ret = drm_intel_gem_bo_wait(dst2, &timeout);
+	if (do_signals)
+		drmtest_stop_signal_helper();
+	if (ret) {
+		fprintf(stderr, "Timed wait failed %s\n", strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	assert(timeout != 0);
+
+	if (timeout ==  (ENOUGH_WORK_IN_SECONDS * NSEC_PER_SEC))
+		printf("Buffer was already done!\n");
+	else {
+		printf("Finished with %lu time remaining\n", timeout);
+	}
+
+	drm_intel_bo_unreference(dst2);
+	drm_intel_bo_unreference(dst);
+	intel_batchbuffer_free(batch);
+	drm_intel_bufmgr_destroy(bufmgr);
+
+	close(fd);
+
+	return 0;
+}
-- 
1.7.10.1

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