[Intel-gfx] [PATCH 2/2] tests: rc6 residency test

[Ben Widawsky]

This is meant to test the sysfs entry for showing rc6 residency in
milliseconds. Remember, sysfs is a permanent interface.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 tests/Makefile.am     |    1 +
 tests/rc6_residency.c |   80 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 tests/rc6_residency.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6544ec7..a8eed88 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -56,6 +56,7 @@ TESTS_progs = \
 	drm_vma_limiter_cpu \
 	drm_vma_limiter_gtt \
 	drm_vma_limiter_cached \
+	rc6_residency \
 	$(NULL)
 
 # IMPORTANT: The ZZ_ tests need to be run last!
diff --git a/tests/rc6_residency.c b/tests/rc6_residency.c
new file mode 100644
index 0000000..8ae6aa4
--- /dev/null
+++ b/tests/rc6_residency.c
@@ -0,0 +1,80 @@
+/*
+ * 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 at bwidawsk.net>
+ *
+ */
+
+#include <stdlib.h>
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include "drmtest.h"
+
+static unsigned int readit(const char *path)
+{
+	unsigned int ret;
+
+	FILE *file;
+	file = fopen(path, "r");
+	if (file == NULL) {
+		fprintf(stderr, "Couldn't open %s (%d)\n", path, errno);
+		abort();
+	}
+	fscanf(file, "%u", &ret);
+	fclose(file);
+
+	return ret;
+}
+
+int main(int argc, char *argv[])
+{
+	/* TODO: don't always assume 0 */
+	const int device = 0;
+	char *path;
+	int fd, ret;
+	unsigned int value, value2;
+
+	/* Use drm_open_any to verify device existence */
+	fd = drm_open_any();
+	close(fd);
+
+	ret = asprintf(&path, "/sys/class/drm/card%d/power/rc6", device);
+	if (ret == -1 || ret < strlen("/sys/class/drm/card0/power/rc6"))
+		abort();
+
+	value = readit(path);
+
+	// Sleep for 3 seconds and compare
+	sleep(3);
+	value2 = readit(path);
+	free(path);
+
+	/* Plenty of fudge */
+	if (((value2 - value) > 3900) ||
+	    ((value2 - value) < 2100))
+		exit(EXIT_FAILURE);
+
+	exit(EXIT_SUCCESS);
+}
-- 
1.7.9.4