[PATCH v7 07/13] user_events: Add self-test for dynamic_events integration

Beau Belgrave
2021-12-09T22:32:40Z

Tests matching deletes, creation of basic and complex types. Ensures
common patterns work correctly when interacting with dynamic_events
file.

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
---
tools/testing/selftests/user_events/Makefile | 2 +-
.../testing/selftests/user_events/dyn_test.c | 130 ++++++++++++++++++
2 files changed, 131 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/user_events/dyn_test.c

diff --git a/tools/testing/selftests/user_events/Makefile b/tools/testing/selftests/user_events/Makefile
index d66c551a6fe3..e824b9c2cae7 100644
--- a/tools/testing/selftests/user_events/Makefile
+++ b/tools/testing/selftests/user_events/Makefile
@@ -2,7 +2,7 @@
CFLAGS += -Wl,-no-as-needed -Wall -I../../../../usr/include
LDLIBS += -lrt -lpthread -lm

-TEST_GEN_PROGS = ftrace_test
+TEST_GEN_PROGS = ftrace_test dyn_test

TEST_FILES := settings

diff --git a/tools/testing/selftests/user_events/dyn_test.c b/tools/testing/selftests/user_events/dyn_test.c
new file mode 100644
index 000000000000..d6265d14cd51
--- /dev/null
+++ b/tools/testing/selftests/user_events/dyn_test.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * User Events Dyn Events Test Program
+ *
+ * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
+ */
+
+#include <errno.h>
+#include <linux/user_events.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "../kselftest_harness.h"
+
+const char *dyn_file = "/sys/kernel/debug/tracing/dynamic_events";
+const char *clear = "!u:__test_event";
+
+static int Append(const char *value)
+{
+ int fd = open(dyn_file, O_RDWR | O_APPEND);
+ int ret = write(fd, value, strlen(value));
+
+ close(fd);
+ return ret;
+}
+
+#define CLEAR() \
+do { \
+ int ret = Append(clear); \
+ if (ret == -1) \
+ ASSERT_EQ(ENOENT, errno); \
+} while (0)
+
+#define TEST_PARSE(x) \
+do { \
+ ASSERT_NE(-1, Append(x)); \
+ CLEAR(); \
+} while (0)
+
+#define TEST_NPARSE(x) ASSERT_EQ(-1, Append(x))
+
+FIXTURE(user) {
+};
+
+FIXTURE_SETUP(user) {
+ CLEAR();
+}
+
+FIXTURE_TEARDOWN(user) {
+ CLEAR();
+}
+
+TEST_F(user, basic_types) {
+ /* All should work */
+ TEST_PARSE("u:__test_event u64 a");
+ TEST_PARSE("u:__test_event u32 a");
+ TEST_PARSE("u:__test_event u16 a");
+ TEST_PARSE("u:__test_event u8 a");
+ TEST_PARSE("u:__test_event char a");
+ TEST_PARSE("u:__test_event unsigned char a");
+ TEST_PARSE("u:__test_event int a");
+ TEST_PARSE("u:__test_event unsigned int a");
+ TEST_PARSE("u:__test_event short a");
+ TEST_PARSE("u:__test_event unsigned short a");
+ TEST_PARSE("u:__test_event char[20] a");
+ TEST_PARSE("u:__test_event unsigned char[20] a");
+ TEST_PARSE("u:__test_event char[0x14] a");
+ TEST_PARSE("u:__test_event unsigned char[0x14] a");
+ /* Bad size format should fail */
+ TEST_NPARSE("u:__test_event char[aa] a");
+ /* Large size should fail */
+ TEST_NPARSE("u:__test_event char[9999] a");
+ /* Long size string should fail */
+ TEST_NPARSE("u:__test_event char[0x0000000000001] a");
+}
+
+TEST_F(user, loc_types) {
+ /* All should work */
+ TEST_PARSE("u:__test_event __data_loc char[] a");
+ TEST_PARSE("u:__test_event __data_loc unsigned char[] a");
+ TEST_PARSE("u:__test_event __rel_loc char[] a");
+ TEST_PARSE("u:__test_event __rel_loc unsigned char[] a");
+}
+
+TEST_F(user, size_types) {
+ /* Should work */
+ TEST_PARSE("u:__test_event struct custom a 20");
+ /* Size not specified on struct should fail */
+ TEST_NPARSE("u:__test_event struct custom a");
+ /* Size specified on non-struct should fail */
+ TEST_NPARSE("u:__test_event char a 20");
+}
+
+TEST_F(user, flags) {
+ /* Should work */
+ TEST_PARSE("u:__test_event:BPF_ITER u32 a");
+ /* Forward compat */
+ TEST_PARSE("u:__test_event:BPF_ITER,FLAG_FUTURE u32 a");
+}
+
+TEST_F(user, matching) {
+ /* Register */
+ ASSERT_NE(-1, Append("u:__test_event struct custom a 20"));
+ /* Should not match */
+ TEST_NPARSE("!u:__test_event struct custom b");
+ /* Should match */
+ TEST_PARSE("!u:__test_event struct custom a");
+ /* Multi field reg */
+ ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
+ /* Non matching cases */
+ TEST_NPARSE("!u:__test_event u32 a");
+ TEST_NPARSE("!u:__test_event u32 b");
+ TEST_NPARSE("!u:__test_event u32 a; u32 ");
+ TEST_NPARSE("!u:__test_event u32 a; u32 a");
+ /* Matching case */
+ TEST_PARSE("!u:__test_event u32 a; u32 b");
+ /* Register */
+ ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
+ /* Ensure trailing semi-colon case */
+ TEST_PARSE("!u:__test_event u32 a; u32 b;");
+}
+
+int main(int argc, char **argv)
+{
+ return test_harness_run(argc, argv);
+}
--
2.17.1