tests/kms_sysfs_edid_timing: Convert sh to C version.

The debug output for a HSW machine with two connectors (VGA and HDMI):

DEBUG: card0-VGA-1: mean.max 12896229,00ns, 12896,23us, 12,90ms, mean.avg 12785055,80ns, 12785,06us, 12,79ms
WARNING: card0-VGA-1: probe time exceed 10ms, max=12,90ms, avg=12,79ms
DEBUG: card0-HDMI-A-1: mean.max 781433,00ns, 781,43us, 0,78ms, mean.avg 706643,20ns, 706,64us, 0,71ms

v4:
- do not include the time opening the fd (Chris Wilson)
- include output from debug (Chris Wilson)

v3:
- use igt_mean for accounting (Chris Wilson)
- make it Intel-agnostic when searching for connectors (Chris Wilson)

v2:
- don't read cached values (Chris Wilson)
- warn on per connector, and fail per mean (Chris Wilson)

These are synthetic: 10ms per connector, and 50ms for all.

Signed-off-by: Marius Vlad <marius.c.vlad@intel.com>
Acked-by: Petri Latvala <petri.latvala@intel.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/tests/kms_sysfs_edid_timing.c b/tests/kms_sysfs_edid_timing.c
new file mode 100644
index 00000000..12013881
--- /dev/null
+++ b/tests/kms_sysfs_edid_timing.c
@@ -0,0 +1,97 @@
+/*
+ * 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.
+ */
+#include "igt.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#define THRESHOLD_PER_CONNECTOR	10
+#define THRESHOLD_TOTAL		50
+#define CHECK_TIMES		15
+
+IGT_TEST_DESCRIPTION("This check the time we take to read the content of all "
+		     "the possible connectors. Without the edid -ENXIO patch "
+		     "(http://permalink.gmane.org/gmane.comp.video.dri.devel/62083), "
+		     "we sometimes take a *really* long time. "
+		     "So let's just check for some reasonable timing here");
+
+
+igt_simple_main
+{
+	DIR *dirp;
+	struct dirent *de;
+
+	dirp = opendir("/sys/class/drm");
+	igt_assert(dirp != NULL);
+
+	while ((de = readdir(dirp))) {
+		struct igt_mean mean = {};
+		struct stat st;
+		char path[PATH_MAX];
+		int i;
+
+		if (*de->d_name == '.')
+			continue;;
+
+		snprintf(path, sizeof(path), "/sys/class/drm/%s/status",
+				de->d_name);
+
+		if (stat(path, &st))
+			continue;
+
+		igt_mean_init(&mean);
+		for (i = 0; i < CHECK_TIMES; i++) {
+			struct timespec ts = {};
+			int fd;
+
+			if ((fd = open(path, O_WRONLY)) < 0)
+				continue;
+
+			igt_nsec_elapsed(&ts);
+			igt_ignore_warn(write(fd, "detect\n", 7));
+			igt_mean_add(&mean, igt_nsec_elapsed(&ts));
+
+			close(fd);
+		}
+
+		igt_debug("%s: mean.max %.2fns, %.2fus, %.2fms, "
+			  "mean.avg %.2fns, %.2fus, %.2fms\n",
+			  de->d_name,
+			  mean.max, mean.max / 1e3, mean.max / 1e6,
+			  mean.mean, mean.mean / 1e3, mean.mean / 1e6);
+
+		if (mean.max > (THRESHOLD_PER_CONNECTOR * 1e6)) {
+			igt_warn("%s: probe time exceed 10ms, "
+				 "max=%.2fms, avg=%.2fms\n", de->d_name,
+				 mean.max / 1e6, mean.mean / 1e6);
+		}
+		igt_assert_f(mean.mean < (THRESHOLD_TOTAL * 1e6),
+			     "%s: average probe time exceeded 50ms, "
+			     "max=%.2fms, avg=%.2fms\n", de->d_name,
+			     mean.max / 1e6, mean.mean / 1e6);
+
+	}
+	closedir(dirp);
+
+}