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Diffstat (limited to 'tools/testing/selftests/membarrier/membarrier_test.c')
-rw-r--r--tools/testing/selftests/membarrier/membarrier_test.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/tools/testing/selftests/membarrier/membarrier_test.c b/tools/testing/selftests/membarrier/membarrier_test.c
new file mode 100644
index 0000000..dde3125
--- /dev/null
+++ b/tools/testing/selftests/membarrier/membarrier_test.c
@@ -0,0 +1,121 @@
+#define _GNU_SOURCE
+#define __EXPORTED_HEADERS__
+
+#include <linux/membarrier.h>
+#include <asm-generic/unistd.h>
+#include <sys/syscall.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "../kselftest.h"
+
+enum test_membarrier_status {
+ TEST_MEMBARRIER_PASS = 0,
+ TEST_MEMBARRIER_FAIL,
+ TEST_MEMBARRIER_SKIP,
+};
+
+static int sys_membarrier(int cmd, int flags)
+{
+ return syscall(__NR_membarrier, cmd, flags);
+}
+
+static enum test_membarrier_status test_membarrier_cmd_fail(void)
+{
+ int cmd = -1, flags = 0;
+
+ if (sys_membarrier(cmd, flags) != -1) {
+ printf("membarrier: Wrong command should fail but passed.\n");
+ return TEST_MEMBARRIER_FAIL;
+ }
+ return TEST_MEMBARRIER_PASS;
+}
+
+static enum test_membarrier_status test_membarrier_flags_fail(void)
+{
+ int cmd = MEMBARRIER_CMD_QUERY, flags = 1;
+
+ if (sys_membarrier(cmd, flags) != -1) {
+ printf("membarrier: Wrong flags should fail but passed.\n");
+ return TEST_MEMBARRIER_FAIL;
+ }
+ return TEST_MEMBARRIER_PASS;
+}
+
+static enum test_membarrier_status test_membarrier_success(void)
+{
+ int cmd = MEMBARRIER_CMD_SHARED, flags = 0;
+
+ if (sys_membarrier(cmd, flags) != 0) {
+ printf("membarrier: Executing MEMBARRIER_CMD_SHARED failed. %s.\n",
+ strerror(errno));
+ return TEST_MEMBARRIER_FAIL;
+ }
+
+ printf("membarrier: MEMBARRIER_CMD_SHARED success.\n");
+ return TEST_MEMBARRIER_PASS;
+}
+
+static enum test_membarrier_status test_membarrier(void)
+{
+ enum test_membarrier_status status;
+
+ status = test_membarrier_cmd_fail();
+ if (status)
+ return status;
+ status = test_membarrier_flags_fail();
+ if (status)
+ return status;
+ status = test_membarrier_success();
+ if (status)
+ return status;
+ return TEST_MEMBARRIER_PASS;
+}
+
+static enum test_membarrier_status test_membarrier_query(void)
+{
+ int flags = 0, ret;
+
+ printf("membarrier MEMBARRIER_CMD_QUERY ");
+ ret = sys_membarrier(MEMBARRIER_CMD_QUERY, flags);
+ if (ret < 0) {
+ printf("failed. %s.\n", strerror(errno));
+ switch (errno) {
+ case ENOSYS:
+ /*
+ * It is valid to build a kernel with
+ * CONFIG_MEMBARRIER=n. However, this skips the tests.
+ */
+ return TEST_MEMBARRIER_SKIP;
+ case EINVAL:
+ default:
+ return TEST_MEMBARRIER_FAIL;
+ }
+ }
+ if (!(ret & MEMBARRIER_CMD_SHARED)) {
+ printf("command MEMBARRIER_CMD_SHARED is not supported.\n");
+ return TEST_MEMBARRIER_FAIL;
+ }
+ printf("syscall available.\n");
+ return TEST_MEMBARRIER_PASS;
+}
+
+int main(int argc, char **argv)
+{
+ switch (test_membarrier_query()) {
+ case TEST_MEMBARRIER_FAIL:
+ return ksft_exit_fail();
+ case TEST_MEMBARRIER_SKIP:
+ return ksft_exit_skip();
+ }
+ switch (test_membarrier()) {
+ case TEST_MEMBARRIER_FAIL:
+ return ksft_exit_fail();
+ case TEST_MEMBARRIER_SKIP:
+ return ksft_exit_skip();
+ }
+
+ printf("membarrier: tests done!\n");
+ return ksft_exit_pass();
+}
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