perf test pmu: Add an eagerly loaded event test

Allow events/aliases to be eagerly loaded for a PMU. Factor out the
pmu_aliases_parse to allow this.

Parse a test event and check it configures the attribute as expected.

There is overlap with the parse-events tests, but this test is done with
a PMU created in a temp directory and doesn't rely on PMUs in sysfs.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/r/20240502213507.2339733-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/tools/perf/tests/pmu.c b/tools/perf/tests/pmu.c
index 424ebdb0f09d..071cfc51b52c 100644
--- a/tools/perf/tests/pmu.c
+++ b/tools/perf/tests/pmu.c
@@ -1,4 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
+#include "evlist.h"
+#include "evsel.h"
 #include "parse-events.h"
 #include "pmu.h"
 #include "tests.h"
@@ -54,6 +56,9 @@ static struct perf_pmu *test_pmu_get(char *dir, size_t sz)
 		{ "krava22", "config2:8,18,48,58\n", },
 		{ "krava23", "config2:28-29,38\n", },
 	};
+	const char *test_event = "krava01=15,krava02=170,krava03=1,krava11=27,krava12=1,"
+		"krava13=2,krava21=119,krava22=11,krava23=2\n";
+
 	char name[PATH_MAX];
 	int dirfd, file;
 	struct perf_pmu *pmu = NULL;
@@ -116,6 +121,24 @@ static struct perf_pmu *test_pmu_get(char *dir, size_t sz)
 		close(file);
 	}
 
+	/* Create test event. */
+	if (mkdirat(dirfd, "perf-pmu-test/events", 0755) < 0) {
+		pr_err("Failed to mkdir PMU events directory\n");
+		goto err_out;
+	}
+	file = openat(dirfd, "perf-pmu-test/events/test-event", O_WRONLY | O_CREAT, 0600);
+	if (!file) {
+		pr_err("Failed to open for writing file \"type\"\n");
+		goto err_out;
+	}
+	len = strlen(test_event);
+	if (write(file, test_event, len) < len) {
+		close(file);
+		pr_err("Failed to write to 'test-event' file\n");
+		goto err_out;
+	}
+	close(file);
+
 	/* Make the PMU reading the files created above. */
 	pmu = perf_pmus__add_test_pmu(dirfd, "perf-pmu-test");
 	if (!pmu)
@@ -176,8 +199,61 @@ err_out:
 	return ret;
 }
 
+static int test__pmu_events(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
+{
+	char dir[PATH_MAX];
+	struct parse_events_error err;
+	struct evlist *evlist;
+	struct evsel *evsel;
+	struct perf_event_attr *attr;
+	int ret = TEST_FAIL;
+	struct perf_pmu *pmu = test_pmu_get(dir, sizeof(dir));
+	const char *event = "perf-pmu-test/test-event/";
+
+
+	if (!pmu)
+		return TEST_FAIL;
+
+	evlist = evlist__new();
+	if (evlist == NULL) {
+		pr_err("Failed allocation");
+		goto err_out;
+	}
+	parse_events_error__init(&err);
+	ret = parse_events(evlist, event, &err);
+	if (ret) {
+		pr_debug("failed to parse event '%s', err %d\n", event, ret);
+		parse_events_error__print(&err, event);
+		if (parse_events_error__contains(&err, "can't access trace events"))
+			ret = TEST_SKIP;
+		goto err_out;
+	}
+	evsel = evlist__first(evlist);
+	attr = &evsel->core.attr;
+	if (attr->config  != 0xc00000000002a823) {
+		pr_err("Unexpected config value %llx\n", attr->config);
+		goto err_out;
+	}
+	if (attr->config1 != 0x8000400000000145) {
+		pr_err("Unexpected config1 value %llx\n", attr->config1);
+		goto err_out;
+	}
+	if (attr->config2 != 0x0400000020041d07) {
+		pr_err("Unexpected config2 value %llx\n", attr->config2);
+		goto err_out;
+	}
+
+	ret = TEST_OK;
+err_out:
+	parse_events_error__exit(&err);
+	evlist__delete(evlist);
+	test_pmu_put(dir, pmu);
+	return ret;
+}
+
 static struct test_case tests__pmu[] = {
 	TEST_CASE("Parsing with PMU format directory", pmu_format),
+	TEST_CASE("Parsing with PMU event", pmu_events),
 	{	.name = NULL, }
 };