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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2025 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*/
#define _GNU_SOURCE
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <numa.h>
#include <numaif.h>
#include <linux/futex.h>
#include <sys/mman.h>
#include "futextest.h"
#include "futex2test.h"
#include "../../kselftest_harness.h"
#define MAX_THREADS 64
static pthread_barrier_t barrier_main;
static pthread_t threads[MAX_THREADS];
struct thread_args {
void *futex_ptr;
unsigned int flags;
int result;
};
static struct thread_args thread_args[MAX_THREADS];
#ifndef FUTEX_NO_NODE
#define FUTEX_NO_NODE (-1)
#endif
#ifndef FUTEX2_MPOL
#define FUTEX2_MPOL 0x08
#endif
static void *thread_lock_fn(void *arg)
{
struct thread_args *args = arg;
int ret;
pthread_barrier_wait(&barrier_main);
ret = futex2_wait(args->futex_ptr, 0, args->flags, NULL, 0);
args->result = ret;
return NULL;
}
static void create_max_threads(void *futex_ptr)
{
int i, ret;
for (i = 0; i < MAX_THREADS; i++) {
thread_args[i].futex_ptr = futex_ptr;
thread_args[i].flags = FUTEX2_SIZE_U32 | FUTEX_PRIVATE_FLAG | FUTEX2_NUMA;
thread_args[i].result = 0;
ret = pthread_create(&threads[i], NULL, thread_lock_fn, &thread_args[i]);
if (ret)
ksft_exit_fail_msg("pthread_create failed\n");
}
}
static void join_max_threads(void)
{
int i, ret;
for (i = 0; i < MAX_THREADS; i++) {
ret = pthread_join(threads[i], NULL);
if (ret)
ksft_exit_fail_msg("pthread_join failed for thread %d\n", i);
}
}
static void __test_futex(void *futex_ptr, int err_value, unsigned int futex_flags)
{
int to_wake, ret, i, need_exit = 0;
pthread_barrier_init(&barrier_main, NULL, MAX_THREADS + 1);
create_max_threads(futex_ptr);
pthread_barrier_wait(&barrier_main);
to_wake = MAX_THREADS;
do {
ret = futex2_wake(futex_ptr, to_wake, futex_flags);
if (err_value) {
if (ret >= 0)
ksft_exit_fail_msg("futex2_wake(%d, 0x%x) should fail, but didn't\n",
to_wake, futex_flags);
if (errno != err_value)
ksft_exit_fail_msg("futex2_wake(%d, 0x%x) expected error was %d, but returned %d (%s)\n",
to_wake, futex_flags, err_value, errno, strerror(errno));
break;
}
if (ret < 0) {
ksft_exit_fail_msg("Failed futex2_wake(%d, 0x%x): %m\n",
to_wake, futex_flags);
}
if (!ret)
usleep(50);
to_wake -= ret;
} while (to_wake);
join_max_threads();
for (i = 0; i < MAX_THREADS; i++) {
if (err_value && thread_args[i].result != -1) {
ksft_print_msg("Thread %d should fail but succeeded (%d)\n",
i, thread_args[i].result);
need_exit = 1;
}
if (!err_value && thread_args[i].result != 0) {
ksft_print_msg("Thread %d failed (%d)\n", i, thread_args[i].result);
need_exit = 1;
}
}
if (need_exit)
ksft_exit_fail_msg("Aborting due to earlier errors.\n");
}
static void test_futex(void *futex_ptr, int err_value)
{
__test_futex(futex_ptr, err_value, FUTEX2_SIZE_U32 | FUTEX_PRIVATE_FLAG | FUTEX2_NUMA);
}
static void test_futex_mpol(void *futex_ptr, int err_value)
{
__test_futex(futex_ptr, err_value, FUTEX2_SIZE_U32 | FUTEX_PRIVATE_FLAG | FUTEX2_NUMA | FUTEX2_MPOL);
}
TEST(futex_numa_mpol)
{
struct futex32_numa *futex_numa;
void *futex_ptr;
int mem_size;
mem_size = sysconf(_SC_PAGE_SIZE);
futex_ptr = mmap(NULL, mem_size * 2, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (futex_ptr == MAP_FAILED)
ksft_exit_fail_msg("mmap() for %d bytes failed\n", mem_size);
/* Create an invalid memory region for the "Memory out of range" test */
mprotect(futex_ptr + mem_size, mem_size, PROT_NONE);
futex_numa = futex_ptr;
ksft_print_msg("Regular test\n");
futex_numa->futex = 0;
futex_numa->numa = FUTEX_NO_NODE;
test_futex(futex_ptr, 0);
if (futex_numa->numa == FUTEX_NO_NODE)
ksft_exit_fail_msg("NUMA node is left uninitialized\n");
/* FUTEX2_NUMA futex must be 8-byte aligned */
ksft_print_msg("Mis-aligned futex\n");
test_futex(futex_ptr + mem_size - 4, EINVAL);
ksft_print_msg("Memory out of range\n");
test_futex(futex_ptr + mem_size, EFAULT);
futex_numa->numa = FUTEX_NO_NODE;
mprotect(futex_ptr, mem_size, PROT_READ);
ksft_print_msg("Memory, RO\n");
test_futex(futex_ptr, EFAULT);
mprotect(futex_ptr, mem_size, PROT_NONE);
ksft_print_msg("Memory, no access\n");
test_futex(futex_ptr, EFAULT);
mprotect(futex_ptr, mem_size, PROT_READ | PROT_WRITE);
ksft_print_msg("Memory back to RW\n");
test_futex(futex_ptr, 0);
ksft_test_result_pass("futex2 memory boundary tests passed\n");
/* MPOL test. Does not work as expected */
#ifdef LIBNUMA_VER_SUFFICIENT
for (int i = 0; i < 4; i++) {
unsigned long nodemask;
int ret;
nodemask = 1 << i;
ret = mbind(futex_ptr, mem_size, MPOL_BIND, &nodemask,
sizeof(nodemask) * 8, 0);
if (ret == 0) {
ret = numa_set_mempolicy_home_node(futex_ptr, mem_size, i, 0);
if (ret != 0)
ksft_exit_fail_msg("Failed to set home node: %m, %d\n", errno);
ksft_print_msg("Node %d test\n", i);
futex_numa->futex = 0;
futex_numa->numa = FUTEX_NO_NODE;
ret = futex2_wake(futex_ptr, 0, FUTEX2_SIZE_U32 | FUTEX_PRIVATE_FLAG | FUTEX2_NUMA | FUTEX2_MPOL);
if (ret < 0)
ksft_test_result_fail("Failed to wake 0 with MPOL: %m\n");
if (futex_numa->numa != i) {
ksft_exit_fail_msg("Returned NUMA node is %d expected %d\n",
futex_numa->numa, i);
}
}
}
ksft_test_result_pass("futex2 MPOL hints test passed\n");
#else
ksft_test_result_skip("futex2 MPOL hints test requires libnuma 2.0.16+\n");
#endif
munmap(futex_ptr, mem_size * 2);
}
TEST_HARNESS_MAIN
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