Based on a mix of the sysfs PMU test (for creating the reference
files) and the tool PMU test, test that parsing given hwmon events
with there aliases creates the expected config values.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/Build          |   1 +
 tools/perf/tests/builtin-test.c |   1 +
 tools/perf/tests/hwmon_pmu.c    | 243 ++++++++++++++++++++++++++++++++
 tools/perf/tests/tests.h        |   1 +
 tools/perf/util/pmus.c          |   7 +
 tools/perf/util/pmus.h          |   3 +
 6 files changed, 256 insertions(+)
 create mode 100644 tools/perf/tests/hwmon_pmu.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index a771e4928247..078d2580d46c 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -67,6 +67,7 @@ perf-test-y += sigtrap.o
 perf-test-y += event_groups.o
 perf-test-y += symbols.o
 perf-test-y += util.o
+perf-test-y += hwmon_pmu.o
 perf-test-y += tool_pmu.o
 
 ifeq ($(SRCARCH),$(filter $(SRCARCH),x86 arm arm64 powerpc))
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 3b30f258c395..81c0f12b8820 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -73,6 +73,7 @@ static struct test_suite *generic_tests[] = {
 	&suite__PERF_RECORD,
 	&suite__pmu,
 	&suite__pmu_events,
+	&suite__hwmon_pmu,
 	&suite__tool_pmu,
 	&suite__dso_data,
 	&suite__perf_evsel__roundtrip_name_test,
diff --git a/tools/perf/tests/hwmon_pmu.c b/tools/perf/tests/hwmon_pmu.c
new file mode 100644
index 000000000000..e32b7804661b
--- /dev/null
+++ b/tools/perf/tests/hwmon_pmu.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+#include "debug.h"
+#include "evlist.h"
+#include "parse-events.h"
+#include "tests.h"
+#include "hwmon_pmu.h"
+#include <fcntl.h>
+#include <sys/stat.h>
+
+static const struct test_event {
+	const char *name;
+	const char *alias;
+	long config;
+} test_events[] = {
+	{
+		"temp_test_hwmon_event1",
+		"temp1",
+		0xA0001,
+	},
+	{
+		"temp_test_hwmon_event2",
+		"temp2",
+		0xA0002,
+	},
+};
+
+/* Cleanup test PMU directory. */
+static int test_pmu_put(const char *dir, struct perf_pmu *hwm)
+{
+	char buf[PATH_MAX + 20];
+	int ret;
+
+	if (scnprintf(buf, sizeof(buf), "rm -fr %s", dir) < 0) {
+		pr_err("Failure to set up buffer for \"%s\"\n", dir);
+		return -EINVAL;
+	}
+	ret = system(buf);
+	if (ret)
+		pr_err("Failure to \"%s\"\n", buf);
+
+	perf_pmu__delete(hwm);
+	return ret;
+}
+
+/*
+ * Prepare test PMU directory data, normally exported by kernel at
+ * /sys/class/hwmon/hwmon<number>/. Give as input a buffer to hold the file
+ * path, the result is PMU loaded using that directory.
+ */
+static struct perf_pmu *test_pmu_get(char *dir, size_t sz)
+{
+	const char *test_hwmon_name_nl = "A test hwmon PMU\n";
+	const char *test_hwmon_name = "A test hwmon PMU";
+	/* Simulated hwmon items. */
+	const struct test_item {
+		const char *name;
+		const char *value;
+	} test_items[] = {
+		{ "temp1_label", "test hwmon event1\n", },
+		{ "temp1_input", "40000\n", },
+		{ "temp2_label", "test hwmon event2\n", },
+		{ "temp2_input", "50000\n", },
+	};
+	int dirfd, file;
+	struct perf_pmu *hwm = NULL;
+	ssize_t len;
+
+	/* Create equivalent of sysfs mount point. */
+	scnprintf(dir, sz, "/tmp/perf-hwmon-pmu-test-XXXXXX");
+	if (!mkdtemp(dir)) {
+		pr_err("mkdtemp failed\n");
+		dir[0] = '\0';
+		return NULL;
+	}
+	dirfd = open(dir, O_DIRECTORY);
+	if (dirfd < 0) {
+		pr_err("Failed to open test directory \"%s\"\n", dir);
+		goto err_out;
+	}
+
+	/* Create the test hwmon directory and give it a name. */
+	if (mkdirat(dirfd, "hwmon1234", 0755) < 0) {
+		pr_err("Failed to mkdir hwmon directory\n");
+		goto err_out;
+	}
+	file = openat(dirfd, "hwmon1234/name", O_WRONLY | O_CREAT, 0600);
+	if (!file) {
+		pr_err("Failed to open for writing file \"name\"\n");
+		goto err_out;
+	}
+	len = strlen(test_hwmon_name_nl);
+	if (write(file, test_hwmon_name_nl, len) < len) {
+		close(file);
+		pr_err("Failed to write to 'name' file\n");
+		goto err_out;
+	}
+	close(file);
+
+	/* Create test hwmon files. */
+	for (size_t i = 0; i < ARRAY_SIZE(test_items); i++) {
+		const struct test_item *item = &test_items[i];
+
+		file = openat(dirfd, item->name, O_WRONLY | O_CREAT, 0600);
+		if (!file) {
+			pr_err("Failed to open for writing file \"%s\"\n", item->name);
+			goto err_out;
+		}
+
+		if (write(file, item->value, strlen(item->value)) < 0) {
+			pr_err("Failed to write to file \"%s\"\n", item->name);
+			close(file);
+			goto err_out;
+		}
+		close(file);
+	}
+
+	/* Make the PMU reading the files created above. */
+	hwm = perf_pmus__add_test_hwmon_pmu(dirfd, "hwmon1234", test_hwmon_name);
+	if (!hwm)
+		pr_err("Test hwmon creation failed\n");
+
+err_out:
+	if (!hwm) {
+		test_pmu_put(dir, hwm);
+		if (dirfd >= 0)
+			close(dirfd);
+	}
+	return hwm;
+}
+
+static int do_test(size_t i, bool with_pmu, bool with_alias)
+{
+	const char *test_event = with_alias ? test_events[i].alias : test_events[i].name;
+	struct evlist *evlist = evlist__new();
+	struct evsel *evsel;
+	struct parse_events_error err;
+	int ret;
+	char str[128];
+	bool found = false;
+
+	if (!evlist) {
+		pr_err("evlist allocation failed\n");
+		return TEST_FAIL;
+	}
+
+	if (with_pmu)
+		snprintf(str, sizeof(str), "/%s/", test_event);
+	else
+		strlcpy(str, test_event, sizeof(str));
+
+	pr_debug("Testing '%s'\n", str);
+	parse_events_error__init(&err);
+	ret = parse_events(evlist, str, &err);
+	if (ret) {
+		evlist__delete(evlist);
+
+		pr_debug("FAILED %s:%d failed to parse event '%s', err %d\n",
+			 __FILE__, __LINE__, str, ret);
+		parse_events_error__print(&err, str);
+		ret = TEST_FAIL;
+		goto out;
+	}
+
+	ret = TEST_OK;
+	if (with_pmu ? (evlist->core.nr_entries != 1) : (evlist->core.nr_entries < 1)) {
+		pr_debug("FAILED %s:%d Unexpected number of events for '%s' of %d\n",
+			 __FILE__, __LINE__, str, evlist->core.nr_entries);
+		ret = TEST_FAIL;
+		goto out;
+	}
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (!perf_pmu__is_hwmon(evsel->pmu))
+			continue;
+
+		if (evsel->core.attr.config != (u64)test_events[i].config) {
+			pr_debug("FAILED %s:%d Unexpected config for '%s', %lld != %ld\n",
+				__FILE__, __LINE__, str,
+				evsel->core.attr.config,
+				test_events[i].config);
+			ret = TEST_FAIL;
+			goto out;
+		}
+		found = true;
+	}
+
+	if (!found) {
+		pr_debug("FAILED %s:%d Didn't find hwmon event '%s' in parsed evsels\n",
+			 __FILE__, __LINE__, str);
+		ret = TEST_FAIL;
+	}
+
+out:
+	evlist__delete(evlist);
+	return ret;
+}
+
+static int test__hwmon_pmu(bool with_pmu)
+{
+	char dir[PATH_MAX];
+	struct perf_pmu *pmu = test_pmu_get(dir, sizeof(dir));
+	int ret = TEST_OK;
+
+	if (!pmu)
+		return TEST_FAIL;
+
+	for (size_t i = 0; i < ARRAY_SIZE(test_events); i++) {
+		ret = do_test(i, with_pmu, /*with_alias=*/false);
+
+		if (ret != TEST_OK)
+			break;
+
+		ret = do_test(i, with_pmu, /*with_alias=*/true);
+
+		if (ret != TEST_OK)
+			break;
+	}
+	test_pmu_put(dir, pmu);
+	return ret;
+}
+
+static int test__hwmon_pmu_without_pmu(struct test_suite *test __maybe_unused,
+				      int subtest __maybe_unused)
+{
+	return test__hwmon_pmu(/*with_pmu=*/false);
+}
+
+static int test__hwmon_pmu_with_pmu(struct test_suite *test __maybe_unused,
+				   int subtest __maybe_unused)
+{
+	return test__hwmon_pmu(/*with_pmu=*/false);
+}
+
+static struct test_case tests__hwmon_pmu[] = {
+	TEST_CASE("Parsing without PMU name", hwmon_pmu_without_pmu),
+	TEST_CASE("Parsing with PMU name", hwmon_pmu_with_pmu),
+	{	.name = NULL, }
+};
+
+struct test_suite suite__hwmon_pmu = {
+	.desc = "Hwmon PMU",
+	.test_cases = tests__hwmon_pmu,
+};
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 1ed76d4156b6..260daa77eb06 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -83,6 +83,7 @@ DECLARE_SUITE(perf_evsel__tp_sched_test);
 DECLARE_SUITE(syscall_openat_tp_fields);
 DECLARE_SUITE(pmu);
 DECLARE_SUITE(pmu_events);
+DECLARE_SUITE(hwmon_pmu);
 DECLARE_SUITE(tool_pmu);
 DECLARE_SUITE(attr);
 DECLARE_SUITE(dso_data);
diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 5c3e88adb9e6..451c6e00ad70 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -733,6 +733,13 @@ struct perf_pmu *perf_pmus__add_test_pmu(int test_sysfs_dirfd, const char *name)
 	return perf_pmu__lookup(&other_pmus, test_sysfs_dirfd, name, /*eager_load=*/true);
 }
 
+struct perf_pmu *perf_pmus__add_test_hwmon_pmu(int hwmon_dir,
+					       const char *sysfs_name,
+					       const char *name)
+{
+	return hwmon_pmu__new(&other_pmus, hwmon_dir, sysfs_name, name);
+}
+
 struct perf_pmu *perf_pmus__fake_pmu(void)
 {
 	static struct perf_pmu fake = {
diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h
index e1742b56eec7..a0cb0eb2ff97 100644
--- a/tools/perf/util/pmus.h
+++ b/tools/perf/util/pmus.h
@@ -30,6 +30,9 @@ bool perf_pmus__supports_extended_type(void);
 char *perf_pmus__default_pmu_name(void);
 
 struct perf_pmu *perf_pmus__add_test_pmu(int test_sysfs_dirfd, const char *name);
+struct perf_pmu *perf_pmus__add_test_hwmon_pmu(int hwmon_dir,
+					       const char *sysfs_name,
+					       const char *name);
 struct perf_pmu *perf_pmus__fake_pmu(void);
 
 #endif /* __PMUS_H */
-- 
2.47.0.105.g07ac214952-goog

Hi Ian,

kernel test robot noticed the following build errors:

[auto build test ERROR on perf-tools-next/perf-tools-next]
[also build test ERROR on next-20241021]
[cannot apply to tip/perf/core perf-tools/perf-tools linus/master acme/perf/core v6.12-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ian-Rogers/tools-api-io-Ensure-line_len_out-is-always-initialized/20241017-143759
base:   https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link:    https://lore.kernel.org/r/20241017063555.366065-5-irogers%40google.com
patch subject: [PATCH v5 4/5] perf test: Add hwmon "PMU" test
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241021/202410212129.7qRTRilb-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410212129.7qRTRilb-lkp@intel.com/

All errors (new ones prefixed by >>):

   Makefile.config:665: No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR
     PERF_VERSION = 6.12.rc3.g552cc7c00b6d
   tests/hwmon_pmu.c: In function 'do_test':
>> tests/hwmon_pmu.c:149:17: error: implicit declaration of function 'strlcpy'; did you mean 'strncpy'? [-Werror=implicit-function-declaration]
     149 |                 strlcpy(str, test_event, sizeof(str));
         |                 ^~~~~~~
         |                 strncpy
   cc1: all warnings being treated as errors
   make[7]: *** [tools/build/Makefile.build:105: tools/perf/tests/hwmon_pmu.o] Error 1
   make[7]: *** Waiting for unfinished jobs....
   make[6]: *** [tools/build/Makefile.build:158: tests] Error 2
   make[5]: *** [Makefile.perf:777: tools/perf/perf-test-in.o] Error 2
   make[5]: *** Waiting for unfinished jobs....
   util/hwmon_pmu.c: In function 'parse_hwmon_filename':
   util/hwmon_pmu.c:175:9: error: implicit declaration of function 'strlcpy'; did you mean 'strncpy'? [-Werror=implicit-function-declaration]
     175 |         strlcpy(fn_type, filename, sizeof(fn_type));
         |         ^~~~~~~
         |         strncpy
   cc1: all warnings being treated as errors
   make[7]: *** [tools/build/Makefile.build:106: tools/perf/util/hwmon_pmu.o] Error 1
   make[7]: *** Waiting for unfinished jobs....
   make[6]: *** [tools/build/Makefile.build:158: util] Error 2
   make[5]: *** [Makefile.perf:789: tools/perf/perf-util-in.o] Error 2
   make[4]: *** [Makefile.perf:292: sub-make] Error 2
   make[3]: *** [Makefile:76: all] Error 2

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki