[PATCH i-g-t 4/4 v4] tests/kms_sysfs_edid_timing: Convert sh to C version.

[Marius Vlad <marius.c.vlad@intel.com>]

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

These are synthetic: 5us per connector, and 600us for all (as
threshold).

Signed-off-by: Marius Vlad <marius.c.vlad@intel.com>
---
 tests/Makefile.sources        |   2 +-
 tests/kms_sysfs_edid_timing   |  25 ----------
 tests/kms_sysfs_edid_timing.c | 107 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 108 insertions(+), 26 deletions(-)
 delete mode 100755 tests/kms_sysfs_edid_timing
 create mode 100644 tests/kms_sysfs_edid_timing.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index b1511c6..8af455a 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -212,6 +212,7 @@ TESTS_progs = \
 	kms_sink_crc_basic \
 	prime_udl \
 	drv_module_reload \
+	kms_sysfs_edid_timing \
 	$(NULL)
 
 # IMPORTANT: The ZZ_ tests need to be run last!
@@ -222,7 +223,6 @@ TESTS_scripts_M = \
 TESTS_scripts = \
 	debugfs_emon_crash \
 	drv_debugfs_reader \
-	kms_sysfs_edid_timing \
 	sysfs_l3_parity \
 	test_rte_check \
 	tools_test \
diff --git a/tests/kms_sysfs_edid_timing b/tests/kms_sysfs_edid_timing
deleted file mode 100755
index 46ea540..0000000
--- a/tests/kms_sysfs_edid_timing
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/bin/bash
-#
-# 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
-#
-
-DRM_LIB_ALLOW_NO_MASTER=1
-
-SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
-. $SOURCE_DIR/drm_lib.sh
-
-TIME1=$(date +%s%N)
-cat $(find /sys/devices/|grep drm | grep /status) > /dev/null
-TIME2=$(date +%s%N)
-
-# time in ms
-RES=$(((TIME2 - TIME1) / 1000000))
-
-if [ $RES -gt 600 ]; then
-	echo "Talking to outputs took ${RES}ms, something is wrong"
-	exit $IGT_EXIT_FAILURE
-fi
-
-exit $IGT_EXIT_SUCCESS
diff --git a/tests/kms_sysfs_edid_timing.c b/tests/kms_sysfs_edid_timing.c
new file mode 100644
index 0000000..3b8bca0
--- /dev/null
+++ b/tests/kms_sysfs_edid_timing.c
@@ -0,0 +1,107 @@
+/*
+ * 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 "igt_debugfs.h"
+#include "igt_sysfs.h"
+#include "igt_core.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#define USEC_PER_SEC		(1000*1000)
+#define THRESHOLD_PER_CONNECTOR	5
+#define THRESHOLD_TOTAL		600
+
+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");
+
+static uint64_t
+mean(uint64_t *a, size_t a_len)
+{
+	int p;
+	uint64_t __sum;
+
+	for (p = 0, __sum = 0; p < a_len; p++) {
+		__sum += a[p];
+	}
+
+	return (__sum / a_len);
+}
+
+igt_simple_main
+{
+	int dir = igt_sysfs_open(-1, NULL);
+	DIR *dirp = fdopendir(dir);
+	struct dirent *de;
+
+	int i, fd = 0;
+	int fds[32];
+
+	uint64_t elapsed, elapsed_mean;
+	uint64_t a[32];
+
+	struct stat st;
+	struct timespec start = {};
+
+	memset(fds, -1, sizeof(fds));
+	memset(a, -1, sizeof(a));
+
+	while ((de = readdir(dirp))) {
+
+		if (*de->d_name == '.')
+			continue;
+
+		if (fstatat(dir, de->d_name, &st, 0))
+			continue;
+
+		if (S_ISDIR(st.st_mode) && !strncmp(de->d_name, "card0-", 6)) {
+			int dfd = openat(dir, de->d_name, O_RDONLY);
+			igt_assert(dfd > 0);
+			fds[fd++] = dfd;
+		}
+	}
+	closedir(dirp);
+
+	for (i = 0; i < fd; i++) {
+		igt_sysfs_set(fds[i], "status", "detect");
+
+		elapsed = igt_nsec_elapsed(&start);
+		igt_sysfs_get(fds[i], "status");
+		elapsed = igt_nsec_elapsed(&start);
+
+		igt_warn_on_f(elapsed > (THRESHOLD_PER_CONNECTOR * USEC_PER_SEC),
+		"Threshold per connector exceeded (elapsed %lu ns)\n", elapsed);
+
+		a[i] = elapsed;
+		close(fds[i]);
+	}
+
+	elapsed_mean = mean(a, i);
+	igt_fail_on_f(elapsed_mean > THRESHOLD_TOTAL * USEC_PER_SEC,
+		     "Threshold exceeded (mean %lu ns)\n", elapsed_mean);
+}
-- 
2.7.4

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