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-rw-r--r--tools/testing/selftests/arm64/fp/za-fork.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/fp/za-fork.c b/tools/testing/selftests/arm64/fp/za-fork.c
new file mode 100644
index 000000000000..ff475c649e96
--- /dev/null
+++ b/tools/testing/selftests/arm64/fp/za-fork.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 ARM Limited.
+ * Original author: Mark Brown <broonie@kernel.org>
+ */
+
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#define EXPECTED_TESTS 1
+
+static void putstr(const char *str)
+{
+ write(1, str, strlen(str));
+}
+
+static void putnum(unsigned int num)
+{
+ char c;
+
+ if (num / 10)
+ putnum(num / 10);
+
+ c = '0' + (num % 10);
+ write(1, &c, 1);
+}
+
+static int tests_run;
+static int tests_passed;
+static int tests_failed;
+static int tests_skipped;
+
+static void print_summary(void)
+{
+ if (tests_passed + tests_failed + tests_skipped != EXPECTED_TESTS)
+ putstr("# UNEXPECTED TEST COUNT: ");
+
+ putstr("# Totals: pass:");
+ putnum(tests_passed);
+ putstr(" fail:");
+ putnum(tests_failed);
+ putstr(" xfail:0 xpass:0 skip:");
+ putnum(tests_skipped);
+ putstr(" error:0\n");
+}
+
+int fork_test(void);
+int verify_fork(void);
+
+/*
+ * If we fork the value in the parent should be unchanged and the
+ * child should start with the same value. This is called from the
+ * fork_test() asm function.
+ */
+int fork_test_c(void)
+{
+ pid_t newpid, waiting;
+ int child_status, parent_result;
+
+ newpid = fork();
+ if (newpid == 0) {
+ /* In child */
+ if (!verify_fork()) {
+ putstr("# ZA state invalid in child\n");
+ exit(0);
+ } else {
+ exit(1);
+ }
+ }
+ if (newpid < 0) {
+ putstr("# fork() failed: -");
+ putnum(-newpid);
+ putstr("\n");
+ return 0;
+ }
+
+ parent_result = verify_fork();
+ if (!parent_result)
+ putstr("# ZA state invalid in parent\n");
+
+ for (;;) {
+ waiting = waitpid(newpid, &child_status, 0);
+
+ if (waiting < 0) {
+ if (errno == EINTR)
+ continue;
+ putstr("# waitpid() failed: ");
+ putnum(errno);
+ putstr("\n");
+ return 0;
+ }
+ if (waiting != newpid) {
+ putstr("# waitpid() returned wrong PID\n");
+ return 0;
+ }
+
+ if (!WIFEXITED(child_status)) {
+ putstr("# child did not exit\n");
+ return 0;
+ }
+
+ return WEXITSTATUS(child_status) && parent_result;
+ }
+}
+
+#define run_test(name) \
+ if (name()) { \
+ tests_passed++; \
+ } else { \
+ tests_failed++; \
+ putstr("not "); \
+ } \
+ putstr("ok "); \
+ putnum(++tests_run); \
+ putstr(" " #name "\n");
+
+int main(int argc, char **argv)
+{
+ int ret, i;
+
+ putstr("TAP version 13\n");
+ putstr("1..");
+ putnum(EXPECTED_TESTS);
+ putstr("\n");
+
+ putstr("# PID: ");
+ putnum(getpid());
+ putstr("\n");
+
+ /*
+ * This test is run with nolibc which doesn't support hwcap and
+ * it's probably disproportionate to implement so instead check
+ * for the default vector length configuration in /proc.
+ */
+ ret = open("/proc/sys/abi/sme_default_vector_length", O_RDONLY, 0);
+ if (ret >= 0) {
+ run_test(fork_test);
+
+ } else {
+ putstr("# SME support not present\n");
+
+ for (i = 0; i < EXPECTED_TESTS; i++) {
+ putstr("ok ");
+ putnum(i);
+ putstr(" skipped\n");
+ }
+
+ tests_skipped += EXPECTED_TESTS;
+ }
+
+ print_summary();
+
+ return 0;
+}