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// SPDX-License-Identifier: LGPL-2.1 OR BSD-2-Clause
#include <bpf_atomic.h>
#include <libarena/common.h>
#include <libarena/asan.h>
#include <libarena/bitmap.h>
#define TEST_BITMAP_THREADS 2
#define TEST_BITMAP_BITS (2 * BITS_PER_LONG_LONG)
#define TEST_BITMAP_SYNC_SPINS BPF_MAX_LOOPS
#define TEST_BITMAP_ITERS 10 * 1000 * 1000
static struct arena_bitmap __arena *bitmap;
static volatile u64 started;
static volatile bool test_abort;
/*
* The test needs cmpxchg atomics on arena memory.
*/
#if defined(ENABLE_ATOMICS_TESTS) && \
(defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
defined(__TARGET_ARCH_s390) || \
defined(__TARGET_ARCH_powerpc) || \
(defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64))
static bool bitmap_tests_enabled(void)
{
return true;
}
#else
static bool bitmap_tests_enabled(void)
{
return false;
}
#endif
__weak
int bitmap_wait_for_start(void)
{
u64 i;
__sync_fetch_and_add(&started, 1);
for (i = zero; i < TEST_BITMAP_SYNC_SPINS && can_loop; i++) {
if (test_abort)
return -EINTR;
if (smp_load_acquire(&started) >= TEST_BITMAP_THREADS)
return 0;
}
test_abort = true;
return -ETIMEDOUT;
}
/*
* The test makes sure writes don't clobber each other by overwriting
* the same word. One thread always writes on even bits, the other on
* odds. Both should be able to operate on the bitmap oblivious of the
* other's operations.
*/
__weak
int bitmap_test_bit_sequence(u32 bit)
{
if (bmp_test_and_clear_bit(bit, bitmap))
return -EINVAL;
if (bmp_test_and_set_bit(bit, bitmap))
return -EINVAL;
if (!bmp_test_bit(bit, bitmap))
return -EINVAL;
if (!bmp_test_and_set_bit(bit, bitmap))
return -EINVAL;
if (!bmp_test_bit(bit, bitmap))
return -EINVAL;
if (!bmp_test_and_clear_bit(bit, bitmap))
return -EINVAL;
if (bmp_test_bit(bit, bitmap))
return -EINVAL;
if (bmp_test_and_clear_bit(bit, bitmap))
return -EINVAL;
bmp_set_bit(bit, bitmap);
if (!bmp_test_bit(bit, bitmap))
return -EINVAL;
bmp_clear_bit(bit, bitmap);
if (bmp_test_bit(bit, bitmap))
return -EINVAL;
bmp_set_bit(bit, bitmap);
if (!bmp_test_bit(bit, bitmap))
return -EINVAL;
return 0;
}
static void bitmap_test_reset_single(int parity)
{
u32 bit;
for (bit = parity; bit < TEST_BITMAP_BITS && can_loop; bit += 2)
bmp_clear_bit(bit, bitmap);
}
static int bitmap_test_common_single(int parity)
{
u32 bit;
int ret;
for (bit = parity; bit < TEST_BITMAP_BITS && can_loop; bit += 2) {
if (test_abort)
return -EINTR;
ret = bitmap_test_bit_sequence(bit);
if (ret) {
test_abort = true;
return ret;
}
}
return 0;
}
static int bitmap_test_common(int parity)
{
int ret;
u32 i;
arena_subprog_init();
ret = bitmap_wait_for_start();
if (ret)
return ret;
for (i = zero; i < TEST_BITMAP_ITERS && can_loop; i++) {
ret = bitmap_test_common_single(parity);
if (ret)
return ret;
if (test_abort)
break;
bitmap_test_reset_single(parity);
}
return 0;
}
SEC("syscall") int parallel_test_bitmap__enabled(void)
{
return bitmap_tests_enabled() ? 0 : -EOPNOTSUPP;
}
SEC("syscall") int parallel_test_bitmap__init(void)
{
bitmap = bmp_alloc(TEST_BITMAP_BITS);
if (!bitmap)
return -ENOMEM;
return 0;
}
SEC("syscall") int parallel_test_bitmap__fini(void)
{
int ret = 0;
if (!bitmap)
return -EINVAL;
bmp_free(bitmap);
bitmap = NULL;
return ret;
}
SEC("syscall") int parallel_test_bitmap__0(void)
{
return bitmap_test_common(0);
}
SEC("syscall") int parallel_test_bitmap__1(void)
{
return bitmap_test_common(1);
}
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