[PATCH i-g-t 2/3] i915/i915_hwmon: General verification of hwmon attributes

[Ashutosh Dixit]

Ensure we can read all hwmon attributes. For writable attributes, also
ensure the read value approximately matches the written value, taking the
clamping of writes into account.

Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 tests/i915/i915_hwmon.c | 82 +++++++++++++++++++++++++++++++++++++++++
 tests/meson.build       |  1 +
 2 files changed, 83 insertions(+)
 create mode 100644 tests/i915/i915_hwmon.c

diff --git a/tests/i915/i915_hwmon.c b/tests/i915/i915_hwmon.c
new file mode 100644
index 00000000000..a0b2c48a96d
--- /dev/null
+++ b/tests/i915/i915_hwmon.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include <dirent.h>
+#include <sys/stat.h>
+#include "igt.h"
+#include "igt_hwmon.h"
+#include "igt_sysfs.h"
+
+IGT_TEST_DESCRIPTION("Tests for i915 hwmon");
+
+static void hwmon_read(int hwm)
+{
+	struct dirent *de;
+	char val[128];
+	DIR *dir;
+
+	dir = fdopendir(dup(hwm));
+	igt_assert(dir);
+	rewinddir(dir);
+
+	while ((de = readdir(dir))) {
+		if (de->d_type != DT_REG || !strcmp(de->d_name, "uevent"))
+			continue;
+
+		igt_assert(igt_sysfs_scanf(hwm, de->d_name, "%127s", val) == 1);
+		igt_debug("'%s': %s\n", de->d_name, val);
+
+	}
+	closedir(dir);
+}
+
+static void hwmon_write(int hwm)
+{
+	struct dirent *de;
+	struct stat st;
+	DIR *dir;
+
+	dir = fdopendir(dup(hwm));
+	igt_assert(dir);
+	rewinddir(dir);
+
+	while ((de = readdir(dir))) {
+		if (de->d_type != DT_REG || !strcmp(de->d_name, "uevent"))
+			continue;
+
+		igt_assert(!fstatat(hwm, de->d_name, &st, 0));
+		if (!(st.st_mode & 0222))
+			continue;
+
+		igt_sysfs_clamped_attr_verify(hwm, de->d_name);
+	}
+	closedir(dir);
+}
+
+igt_main
+{
+	int fd, hwm;
+
+	igt_fixture {
+		fd = drm_open_driver_master(DRIVER_INTEL);
+		hwm = igt_hwmon_open(fd);
+		igt_require(hwm >= 0);
+	}
+
+	igt_describe("Verify we can read all hwmon attributes");
+	igt_subtest("hwmon-read") {
+		hwmon_read(hwm);
+	}
+
+	igt_describe("Verify writable hwmon attributes");
+	igt_subtest("hwmon-write") {
+		hwmon_write(hwm);
+	}
+
+	igt_fixture {
+		close(hwm);
+		close(fd);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 619c18b2516..a593055c23a 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -211,6 +211,7 @@ i915_progs = [
 	'i915_fb_tiling',
 	'i915_getparams_basic',
 	'i915_hangman',
+	'i915_hwmon',
 	'i915_module_load',
 	'i915_pciid',
 	'i915_pipe_stress',
-- 
2.38.0