6 files changed, 137 insertions, 0 deletions

diff --git a/tools/testing/selftests/user_events/abi_test.c b/tools/testing/selftests/user_events/abi_test.c
index 5125c42efe65..8202f1327c39 100644
--- a/tools/testing/selftests/user_events/abi_test.c
+++ b/tools/testing/selftests/user_events/abi_test.c
@@ -19,6 +19,7 @@
 #include <asm/unistd.h>
 
 #include "../kselftest_harness.h"
+#include "user_events_selftests.h"
 
 const char *data_file = "/sys/kernel/tracing/user_events_data";
 const char *enable_file = "/sys/kernel/tracing/events/user_events/__abi_event/enable";
@@ -90,14 +91,18 @@ static int reg_disable(long *enable, int bit)
 
 FIXTURE(user) {
 	long check;
+	bool umount;
 };
 
 FIXTURE_SETUP(user) {
+	USER_EVENT_FIXTURE_SETUP(return, self->umount);
+
 	change_event(false);
 	self->check = 0;
 }
 
 FIXTURE_TEARDOWN(user) {
+	USER_EVENT_FIXTURE_TEARDOWN(self->umount);
 }
 
 TEST_F(user, enablement) {
diff --git a/tools/testing/selftests/user_events/config b/tools/testing/selftests/user_events/config
new file mode 100644
index 000000000000..64f7a9a90cec
--- /dev/null
+++ b/tools/testing/selftests/user_events/config
@@ -0,0 +1 @@
+CONFIG_USER_EVENTS=y
diff --git a/tools/testing/selftests/user_events/dyn_test.c b/tools/testing/selftests/user_events/dyn_test.c
index 91a4444ad42b..a85980190bea 100644
--- a/tools/testing/selftests/user_events/dyn_test.c
+++ b/tools/testing/selftests/user_events/dyn_test.c
@@ -15,6 +15,7 @@
 #include <unistd.h>
 
 #include "../kselftest_harness.h"
+#include "user_events_selftests.h"
 
 const char *abi_file = "/sys/kernel/tracing/user_events_data";
 const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
@@ -143,12 +144,16 @@ do { \
 
 FIXTURE(user) {
 	int check;
+	bool umount;
 };
 
 FIXTURE_SETUP(user) {
+	USER_EVENT_FIXTURE_SETUP(return, self->umount);
 }
 
 FIXTURE_TEARDOWN(user) {
+	USER_EVENT_FIXTURE_TEARDOWN(self->umount);
+
 	wait_for_delete();
 }
 
diff --git a/tools/testing/selftests/user_events/ftrace_test.c b/tools/testing/selftests/user_events/ftrace_test.c
index 5beb0aef1d81..dcd7509fe2e0 100644
--- a/tools/testing/selftests/user_events/ftrace_test.c
+++ b/tools/testing/selftests/user_events/ftrace_test.c
@@ -16,6 +16,7 @@
 #include <unistd.h>
 
 #include "../kselftest_harness.h"
+#include "user_events_selftests.h"
 
 const char *data_file = "/sys/kernel/tracing/user_events_data";
 const char *status_file = "/sys/kernel/tracing/user_events_status";
@@ -203,9 +204,12 @@ FIXTURE(user) {
 	int data_fd;
 	int enable_fd;
 	int check;
+	bool umount;
 };
 
 FIXTURE_SETUP(user) {
+	USER_EVENT_FIXTURE_SETUP(return, self->umount);
+
 	self->status_fd = open(status_file, O_RDONLY);
 	ASSERT_NE(-1, self->status_fd);
 
@@ -216,6 +220,8 @@ FIXTURE_SETUP(user) {
 }
 
 FIXTURE_TEARDOWN(user) {
+	USER_EVENT_FIXTURE_TEARDOWN(self->umount);
+
 	close(self->status_fd);
 	close(self->data_fd);
 
diff --git a/tools/testing/selftests/user_events/perf_test.c b/tools/testing/selftests/user_events/perf_test.c
index 8b09be566fa2..5288e768b207 100644
--- a/tools/testing/selftests/user_events/perf_test.c
+++ b/tools/testing/selftests/user_events/perf_test.c
@@ -17,6 +17,7 @@
 #include <asm/unistd.h>
 
 #include "../kselftest_harness.h"
+#include "user_events_selftests.h"
 
 const char *data_file = "/sys/kernel/tracing/user_events_data";
 const char *id_file = "/sys/kernel/tracing/events/user_events/__test_event/id";
@@ -110,14 +111,19 @@ static int clear(int *check)
 FIXTURE(user) {
 	int data_fd;
 	int check;
+	bool umount;
 };
 
 FIXTURE_SETUP(user) {
+	USER_EVENT_FIXTURE_SETUP(return, self->umount);
+
 	self->data_fd = open(data_file, O_RDWR);
 	ASSERT_NE(-1, self->data_fd);
 }
 
 FIXTURE_TEARDOWN(user) {
+	USER_EVENT_FIXTURE_TEARDOWN(self->umount);
+
 	close(self->data_fd);
 
 	if (clear(&self->check) != 0)
diff --git a/tools/testing/selftests/user_events/user_events_selftests.h b/tools/testing/selftests/user_events/user_events_selftests.h
new file mode 100644
index 000000000000..e1c3c063c031
--- /dev/null
+++ b/tools/testing/selftests/user_events/user_events_selftests.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _USER_EVENTS_SELFTESTS_H
+#define _USER_EVENTS_SELFTESTS_H
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "../kselftest.h"
+
+static inline void tracefs_unmount(void)
+{
+	umount("/sys/kernel/tracing");
+}
+
+static inline bool tracefs_enabled(char **message, bool *fail, bool *umount)
+{
+	struct stat buf;
+	int ret;
+
+	*message = "";
+	*fail = false;
+	*umount = false;
+
+	/* Ensure tracefs is installed */
+	ret = stat("/sys/kernel/tracing", &buf);
+
+	if (ret == -1) {
+		*message = "Tracefs is not installed";
+		return false;
+	}
+
+	/* Ensure mounted tracefs */
+	ret = stat("/sys/kernel/tracing/README", &buf);
+
+	if (ret == -1 && errno == ENOENT) {
+		if (mount(NULL, "/sys/kernel/tracing", "tracefs", 0, NULL) != 0) {
+			*message = "Cannot mount tracefs";
+			*fail = true;
+			return false;
+		}
+
+		*umount = true;
+
+		ret = stat("/sys/kernel/tracing/README", &buf);
+	}
+
+	if (ret == -1) {
+		*message = "Cannot access tracefs";
+		*fail = true;
+		return false;
+	}
+
+	return true;
+}
+
+static inline bool user_events_enabled(char **message, bool *fail, bool *umount)
+{
+	struct stat buf;
+	int ret;
+
+	*message = "";
+	*fail = false;
+	*umount = false;
+
+	if (getuid() != 0) {
+		*message = "Must be run as root";
+		*fail = true;
+		return false;
+	}
+
+	if (!tracefs_enabled(message, fail, umount))
+		return false;
+
+	/* Ensure user_events is installed */
+	ret = stat("/sys/kernel/tracing/user_events_data", &buf);
+
+	if (ret == -1) {
+		switch (errno) {
+		case ENOENT:
+			*message = "user_events is not installed";
+			return false;
+
+		default:
+			*message = "Cannot access user_events_data";
+			*fail = true;
+			return false;
+		}
+	}
+
+	return true;
+}
+
+#define USER_EVENT_FIXTURE_SETUP(statement, umount) do { \
+	char *message; \
+	bool fail; \
+	if (!user_events_enabled(&message, &fail, &(umount))) { \
+		if (fail) { \
+			TH_LOG("Setup failed due to: %s", message); \
+			ASSERT_FALSE(fail); \
+		} \
+		SKIP(statement, "Skipping due to: %s", message); \
+	} \
+} while (0)
+
+#define USER_EVENT_FIXTURE_TEARDOWN(umount) do { \
+	if ((umount))  \
+		tracefs_unmount(); \
+} while (0)
+
+#endif /* _USER_EVENTS_SELFTESTS_H */