[LTP] [PATCH v3 16/31] testcases: sysfs: Add sys_wakeup01

[Cyril Hrubis]

A test for /sys/class/wakeup/*/* files.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 runtest/sysfs                                 |   1 +
 .../kernel/sysfs/class/wakeup/.gitignore      |   1 +
 testcases/kernel/sysfs/class/wakeup/Makefile  |   7 +
 .../kernel/sysfs/class/wakeup/sys_wakeup01.c  | 124 ++++++++++++++++++
 4 files changed, 133 insertions(+)
 create mode 100644 testcases/kernel/sysfs/class/wakeup/.gitignore
 create mode 100644 testcases/kernel/sysfs/class/wakeup/Makefile
 create mode 100644 testcases/kernel/sysfs/class/wakeup/sys_wakeup01.c

diff --git a/runtest/sysfs b/runtest/sysfs
index f515c4c1e..b8d003228 100644
--- a/runtest/sysfs
+++ b/runtest/sysfs
@@ -12,3 +12,4 @@ sys_ata01 sys_ata01
 sys_bdi01 sys_bdi01
 sys_hwmon01 sys_hwmon01
 sys_leds01 sys_leds01
+sys_wakeup01 sys_wakeup01
diff --git a/testcases/kernel/sysfs/class/wakeup/.gitignore b/testcases/kernel/sysfs/class/wakeup/.gitignore
new file mode 100644
index 000000000..16d0375cd
--- /dev/null
+++ b/testcases/kernel/sysfs/class/wakeup/.gitignore
@@ -0,0 +1 @@
+/sys_wakeup01
diff --git a/testcases/kernel/sysfs/class/wakeup/Makefile b/testcases/kernel/sysfs/class/wakeup/Makefile
new file mode 100644
index 000000000..034038061
--- /dev/null
+++ b/testcases/kernel/sysfs/class/wakeup/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2026 Cyril Hrubis <chrubis@suse.cz>
+
+top_srcdir		?= ../../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/sysfs/class/wakeup/sys_wakeup01.c b/testcases/kernel/sysfs/class/wakeup/sys_wakeup01.c
new file mode 100644
index 000000000..82bf5891d
--- /dev/null
+++ b/testcases/kernel/sysfs/class/wakeup/sys_wakeup01.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Cyril Hrubis <chrubis@suse.cz>
+ */
+
+/*\
+ * Sanity checks for the wakeup source statistics exported under
+ * /sys/class/wakeup/wakeupN/.
+ *
+ * For every wakeup source the test verifies that:
+ *
+ * - name is a non-empty string
+ * - active_count, active_time_ms, event_count, expire_count, last_change_ms,
+ *   max_time_ms, prevent_suspend_time_ms, total_time_ms and wakeup_count are
+ *   all non-negative
+ * - active_time_ms <= total_time_ms (currently active time is part of the
+ *   accumulated total)
+ * - max_time_ms <= total_time_ms (the longest single event cannot exceed the
+ *   accumulated total)
+ *
+ * The test skips with TCONF when no wakeup source is present.
+ *
+ * The /sys/class/wakeup/ itself only exists when CONFIG_PM_SLEEP=y is set.
+ */
+
+#include <string.h>
+#include <limits.h>
+#include <dirent.h>
+#include "tst_test.h"
+#include "tst_sysfs_assert.h"
+
+#define WAKEUP "/sys/class/wakeup"
+
+/*
+ * active_count/event_count/wakeup_count/expire_count are exported by the
+ * kernel as "unsigned long" (see drivers/base/power/wakeup_stats.c), hence
+ * the RANGEUU (unsigned long long bounds) variant is used for these: it
+ * lets us use the real ULONG_MAX.
+ */
+static const char *const count_attrs[] = {
+	"active_count",
+	"event_count",
+	"expire_count",
+	"wakeup_count",
+};
+
+/*
+ * active_time_ms/total_time_ms/max_time_ms/last_change_ms/
+ * prevent_suspend_time_ms are exported by the kernel as a signed 64bit
+ * ktime_t converted to milliseconds (see drivers/base/power/wakeup_stats.c),
+ * i.e. their real ceiling is LLONG_MAX regardless of the architecture. On a
+ * 32bit test build "long" is only 32bit (~24.8 days worth of ms), so plain
+ * LONG_MAX would be too tight and could false-fail on a long-uptime system.
+ */
+static const char *const time_ms_attrs[] = {
+	"active_time_ms",
+	"last_change_ms",
+	"max_time_ms",
+	"prevent_suspend_time_ms",
+	"total_time_ms",
+};
+
+static void check_wakeup(const char *dev)
+{
+	char name[128] = "";
+	unsigned int i;
+
+	tst_res(TINFO, "Checking %s", dev);
+
+	if (!TST_SYSFS_READ_STR(name, sizeof(name), WAKEUP "/%s/name", dev)) {
+		tst_res(TCONF, "%s vanished before it could be checked", dev);
+		return;
+	}
+
+	if (name[0] != '\0')
+		tst_res(TPASS, "%s: name = '%s'", dev, name);
+	else
+		tst_res(TFAIL, "%s: name is empty", dev);
+
+	for (i = 0; i < ARRAY_SIZE(count_attrs); i++) {
+		TST_SYSFS_ASSERT_RANGEUU(0, ULONG_MAX, WAKEUP "/%s/%s", dev,
+					 count_attrs[i]);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(time_ms_attrs); i++) {
+		TST_SYSFS_ASSERT_RANGELL(0, LLONG_MAX, WAKEUP "/%s/%s", dev,
+					 time_ms_attrs[i]);
+	}
+
+	TST_SYSFS_ASSERT_LE_SUFFIX("active_time_ms", "total_time_ms",
+				   WAKEUP "/%s/", dev);
+	TST_SYSFS_ASSERT_LE_SUFFIX("max_time_ms", "total_time_ms",
+				   WAKEUP "/%s/", dev);
+}
+
+static void do_test(void)
+{
+	DIR *d;
+	struct dirent *ent;
+	int found = 0;
+
+	d = SAFE_OPENDIR(WAKEUP);
+
+	while ((ent = SAFE_READDIR(d))) {
+		if (strncmp(ent->d_name, "wakeup", 6))
+			continue;
+
+		found = 1;
+		check_wakeup(ent->d_name);
+	}
+
+	SAFE_CLOSEDIR(d);
+
+	if (!found)
+		tst_res(TCONF, "No wakeup source found");
+}
+
+static struct tst_test test = {
+	.test_all = do_test,
+	.needs_kconfigs = (const char *[]){
+		"CONFIG_PM_SLEEP=y",
+		NULL
+	},
+};
-- 
2.51.0