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Subject[PATCH v3 4/4] selftests: futex: Add FUTEX_WAIT_MULTIPLE wake up test
Date
From: Gabriel Krisman Bertazi <krisman@collabora.com>

Add test for wait at multiple futexes mechanism. Skip the test if it's a
x32 application and the kernel returned the approtiaded error, since this
ABI is not supported for this operation.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Co-developed-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: André Almeida <andrealmeid@collabora.com>
---
Changes since v2: none
---
.../selftests/futex/functional/.gitignore | 1 +
.../selftests/futex/functional/Makefile | 3 +-
.../futex/functional/futex_wait_multiple.c | 173 ++++++++++++++++++
.../testing/selftests/futex/functional/run.sh | 3 +
4 files changed, 179 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/futex/functional/futex_wait_multiple.c

diff --git a/tools/testing/selftests/futex/functional/.gitignore b/tools/testing/selftests/futex/functional/.gitignore
index a09f57061902..4660128a545e 100644
--- a/tools/testing/selftests/futex/functional/.gitignore
+++ b/tools/testing/selftests/futex/functional/.gitignore
@@ -5,3 +5,4 @@ futex_wait_private_mapped_file
futex_wait_timeout
futex_wait_uninitialized_heap
futex_wait_wouldblock
+futex_wait_multiple
diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
index 30996306cabc..75f9fface11f 100644
--- a/tools/testing/selftests/futex/functional/Makefile
+++ b/tools/testing/selftests/futex/functional/Makefile
@@ -14,7 +14,8 @@ TEST_GEN_FILES := \
futex_requeue_pi_signal_restart \
futex_requeue_pi_mismatched_ops \
futex_wait_uninitialized_heap \
- futex_wait_private_mapped_file
+ futex_wait_private_mapped_file \
+ futex_wait_multiple

TEST_PROGS := run.sh

diff --git a/tools/testing/selftests/futex/functional/futex_wait_multiple.c b/tools/testing/selftests/futex/functional/futex_wait_multiple.c
new file mode 100644
index 000000000000..b48422e79f42
--- /dev/null
+++ b/tools/testing/selftests/futex/functional/futex_wait_multiple.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ *
+ * Copyright © Collabora, Ltd., 2019
+ *
+ * DESCRIPTION
+ * Test basic semantics of FUTEX_WAIT_MULTIPLE
+ *
+ * AUTHOR
+ * Gabriel Krisman Bertazi <krisman@collabora.com>
+ *
+ * HISTORY
+ * 2019-Dec-13: Initial version by Krisman <krisman@collabora.com>
+ *
+ *****************************************************************************/
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <pthread.h>
+#include "futextest.h"
+#include "logging.h"
+
+#define TEST_NAME "futex-wait-multiple"
+#define timeout_ns 100000
+#define MAX_COUNT 128
+#define WAKE_WAIT_US 3000000
+
+int ret = RET_PASS;
+char *progname;
+futex_t f[MAX_COUNT] = {0};
+struct futex_wait_block fwb[MAX_COUNT];
+
+void usage(char *prog)
+{
+ printf("Usage: %s\n", prog);
+ printf(" -c Use color\n");
+ printf(" -h Display this help message\n");
+ printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+ VQUIET, VCRITICAL, VINFO);
+}
+
+void test_count_overflow(void)
+{
+ futex_t f = FUTEX_INITIALIZER;
+ struct futex_wait_block fwb[MAX_COUNT+1];
+ int res, i;
+
+ ksft_print_msg("%s: Test a too big number of futexes\n", progname);
+
+ for (i = 0; i < MAX_COUNT+1; i++) {
+ fwb[i].uaddr = &f;
+ fwb[i].val = f;
+ fwb[i].bitset = 0;
+ }
+
+ res = futex_wait_multiple(fwb, MAX_COUNT+1, NULL, FUTEX_PRIVATE_FLAG);
+
+#ifdef __ILP32__
+ if (res != -1 || errno != ENOSYS) {
+ ksft_test_result_fail("futex_wait_multiple returned %d\n",
+ res < 0 ? errno : res);
+ ret = RET_FAIL;
+ } else {
+ ksft_test_result_skip("futex_wait_multiple not supported at x32\n");
+ }
+#else
+ if (res != -1 || errno != EINVAL) {
+ ksft_test_result_fail("futex_wait_multiple returned %d\n",
+ res < 0 ? errno : res);
+ ret = RET_FAIL;
+ } else {
+ ksft_test_result_pass("futex_wait_multiple count overflow succeed\n");
+ }
+
+#endif /* __ILP32__ */
+}
+
+void *waiterfn(void *arg)
+{
+ int res;
+
+ res = futex_wait_multiple(fwb, MAX_COUNT, NULL, FUTEX_PRIVATE_FLAG);
+
+#ifdef __ILP32__
+ if (res != -1 || errno != ENOSYS) {
+ ksft_test_result_fail("futex_wait_multiple returned %d\n",
+ res < 0 ? errno : res);
+ ret = RET_FAIL;
+ } else {
+ ksft_test_result_skip("futex_wait_multiple not supported at x32\n");
+ }
+#else
+ if (res < 0)
+ ksft_print_msg("waiter failed %d\n", res);
+
+ info("futex_wait_multiple: Got hint futex %d was freed\n", res);
+#endif /* __ILP32__ */
+
+ return NULL;
+}
+
+void test_fwb_wakeup(void)
+{
+ int res, i;
+ pthread_t waiter;
+
+ ksft_print_msg("%s: Test wake up in a list of futex\n", progname);
+
+ for (i = 0; i < MAX_COUNT; i++) {
+ fwb[i].uaddr = &f[i];
+ fwb[i].val = f[i];
+ fwb[i].bitset = 0xffffffff;
+ }
+
+ res = pthread_create(&waiter, NULL, waiterfn, NULL);
+ if (res) {
+ ksft_test_result_fail("Creating waiting thread failed");
+ ksft_exit_fail();
+ }
+
+ usleep(WAKE_WAIT_US);
+ res = futex_wake(&(f[MAX_COUNT-1]), 1, FUTEX_PRIVATE_FLAG);
+ if (res != 1) {
+ ksft_test_result_fail("Failed to wake thread res=%d\n", res);
+ ksft_exit_fail();
+ }
+
+ pthread_join(waiter, NULL);
+ ksft_test_result_pass("%s succeed\n", __func__);
+}
+
+int main(int argc, char *argv[])
+{
+ int c;
+
+ while ((c = getopt(argc, argv, "cht:v:")) != -1) {
+ switch (c) {
+ case 'c':
+ log_color(1);
+ break;
+ case 'h':
+ usage(basename(argv[0]));
+ exit(0);
+ case 'v':
+ log_verbosity(atoi(optarg));
+ break;
+ default:
+ usage(basename(argv[0]));
+ exit(1);
+ }
+ }
+
+ progname = basename(argv[0]);
+
+ ksft_print_header();
+ ksft_set_plan(2);
+
+ test_count_overflow();
+
+#ifdef __ILP32__
+ // if it's a 32x binary, there's no futex to wakeup
+ ksft_test_result_skip("futex_wait_multiple not supported at x32\n");
+#else
+ test_fwb_wakeup();
+#endif /* __ILP32__ */
+
+ ksft_print_cnts();
+ return ret;
+}
diff --git a/tools/testing/selftests/futex/functional/run.sh b/tools/testing/selftests/futex/functional/run.sh
index 1acb6ace1680..a8be94f28ff7 100755
--- a/tools/testing/selftests/futex/functional/run.sh
+++ b/tools/testing/selftests/futex/functional/run.sh
@@ -73,3 +73,6 @@ echo
echo
./futex_wait_uninitialized_heap $COLOR
./futex_wait_private_mapped_file $COLOR
+
+echo
+./futex_wait_multiple $COLOR
--
2.25.0
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