// SPDX-License-Identifier: GPL-2.0-or-later/* * Testsuite for atomic64_t functions * * Copyright © 2010  Luca Barbieri */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h>#include <linux/bug.h>#include <linux/kernel.h>#include <linux/atomic.h>#include <linux/module.h> #ifdef CONFIG_X86#include <asm/cpufeature.h>	/* for boot_cpu_has below */#endif #define TEST(bit, op, c_op, val)				\do {								\	atomic##bit##_set(&v, v0);				\	r = v0;							\	atomic##bit##_##op(val, &v);				\	r c_op val;						\	WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n",	\		(unsigned long long)atomic##bit##_read(&v),	\		(unsigned long long)r);				\} while (0) /* * Test for a atomic operation family, * @test should be a macro accepting parameters (bit, op, ...) */ #define FAMILY_TEST(test, bit, op, args...)	\do {						\	test(bit, op, ##args);		\	test(bit, op##_acquire, ##args);	\	test(bit, op##_release, ##args);	\	test(bit, op##_relaxed, ##args);	\} while (0) #define TEST_RETURN(bit, op, c_op, val)				\do {								\	atomic##bit##_set(&v, v0);				\	r = v0;							\	r c_op val;						\	BUG_ON(atomic##bit##_##op(val, &v) != r);		\	BUG_ON(atomic##bit##_read(&v) != r);			\} while (0) #define TEST_FETCH(bit, op, c_op, val)				\do {								\	atomic##bit##_set(&v, v0);				\	r = v0;							\	r c_op val;						\	BUG_ON(atomic##bit##_##op(val, &v) != v0);		\	BUG_ON(atomic##bit##_read(&v) != r);			\} while (0) #define RETURN_FAMILY_TEST(bit, op, c_op, val)			\do {								\	FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);		\} while (0) #define FETCH_FAMILY_TEST(bit, op, c_op, val)			\do {								\	FAMILY_TEST(TEST_FETCH, bit, op, c_op, val);		\} while (0) #define TEST_ARGS(bit, op, init, ret, expect, args...)		\do {								\	atomic##bit##_set(&v, init);				\	BUG_ON(atomic##bit##_##op(&v, ##args) != ret);		\	BUG_ON(atomic##bit##_read(&v) != expect);		\} while (0) #define XCHG_FAMILY_TEST(bit, init, new)				\do {									\	FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new);	\} while (0) #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong)			\do {									\	FAMILY_TEST(TEST_ARGS, bit, cmpxchg, 				\			init, init, new, init, new);			\	FAMILY_TEST(TEST_ARGS, bit, cmpxchg,				\			init, init, init, wrong, new);			\} while (0) #define INC_RETURN_FAMILY_TEST(bit, i)			\do {							\	FAMILY_TEST(TEST_ARGS, bit, inc_return,		\			i, (i) + one, (i) + one);	\} while (0) #define DEC_RETURN_FAMILY_TEST(bit, i)			\do {							\	FAMILY_TEST(TEST_ARGS, bit, dec_return,		\			i, (i) - one, (i) - one);	\} while (0) static __init void test_atomic(void){	int v0 = 0xaaa31337;	int v1 = 0xdeadbeef;	int onestwos = 0x11112222;	int one = 1; 	atomic_t v;	int r; 	TEST(, add, +=, onestwos);	TEST(, add, +=, -one);	TEST(, sub, -=, onestwos);	TEST(, sub, -=, -one);	TEST(, or, |=, v1);	TEST(, and, &=, v1);	TEST(, xor, ^=, v1);	TEST(, andnot, &= ~, v1); 	RETURN_FAMILY_TEST(, add_return, +=, onestwos);	RETURN_FAMILY_TEST(, add_return, +=, -one);	RETURN_FAMILY_TEST(, sub_return, -=, onestwos);	RETURN_FAMILY_TEST(, sub_return, -=, -one); 	FETCH_FAMILY_TEST(, fetch_add, +=, onestwos);	FETCH_FAMILY_TEST(, fetch_add, +=, -one);	FETCH_FAMILY_TEST(, fetch_sub, -=, onestwos);	FETCH_FAMILY_TEST(, fetch_sub, -=, -one); 	FETCH_FAMILY_TEST(, fetch_or,  |=, v1);	FETCH_FAMILY_TEST(, fetch_and, &=, v1);	FETCH_FAMILY_TEST(, fetch_andnot, &= ~, v1);	FETCH_FAMILY_TEST(, fetch_xor, ^=, v1); 	INC_RETURN_FAMILY_TEST(, v0);	DEC_RETURN_FAMILY_TEST(, v0); 	XCHG_FAMILY_TEST(, v0, v1);	CMPXCHG_FAMILY_TEST(, v0, v1, onestwos); } #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)static __init void test_atomic64(void){	long long v0 = 0xaaa31337c001d00dLL;	long long v1 = 0xdeadbeefdeafcafeLL;	long long v2 = 0xfaceabadf00df001LL;	long long v3 = 0x8000000000000000LL;	long long onestwos = 0x1111111122222222LL;	long long one = 1LL;	int r_int; 	atomic64_t v = ATOMIC64_INIT(v0);	long long r = v0;	BUG_ON(v.counter != r); 	atomic64_set(&v, v1);	r = v1;	BUG_ON(v.counter != r);	BUG_ON(atomic64_read(&v) != r); 	TEST(64, add, +=, onestwos);	TEST(64, add, +=, -one);	TEST(64, sub, -=, onestwos);	TEST(64, sub, -=, -one);	TEST(64, or, |=, v1);	TEST(64, and, &=, v1);	TEST(64, xor, ^=, v1);	TEST(64, andnot, &= ~, v1); 	RETURN_FAMILY_TEST(64, add_return, +=, onestwos);	RETURN_FAMILY_TEST(64, add_return, +=, -one);	RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);	RETURN_FAMILY_TEST(64, sub_return, -=, -one); 	FETCH_FAMILY_TEST(64, fetch_add, +=, onestwos);	FETCH_FAMILY_TEST(64, fetch_add, +=, -one);	FETCH_FAMILY_TEST(64, fetch_sub, -=, onestwos);	FETCH_FAMILY_TEST(64, fetch_sub, -=, -one); 	FETCH_FAMILY_TEST(64, fetch_or,  |=, v1);	FETCH_FAMILY_TEST(64, fetch_and, &=, v1);	FETCH_FAMILY_TEST(64, fetch_andnot, &= ~, v1);	FETCH_FAMILY_TEST(64, fetch_xor, ^=, v1); 	INIT(v0);	atomic64_inc(&v);	r += one;	BUG_ON(v.counter != r); 	INIT(v0);	atomic64_dec(&v);	r -= one;	BUG_ON(v.counter != r); 	INC_RETURN_FAMILY_TEST(64, v0);	DEC_RETURN_FAMILY_TEST(64, v0); 	XCHG_FAMILY_TEST(64, v0, v1);	CMPXCHG_FAMILY_TEST(64, v0, v1, v2); 	INIT(v0);	BUG_ON(atomic64_add_unless(&v, one, v0));	BUG_ON(v.counter != r); 	INIT(v0);	BUG_ON(!atomic64_add_unless(&v, one, v1));	r += one;	BUG_ON(v.counter != r); 	INIT(onestwos);	BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));	r -= one;	BUG_ON(v.counter != r); 	INIT(0);	BUG_ON(atomic64_dec_if_positive(&v) != -one);	BUG_ON(v.counter != r); 	INIT(-one);	BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));	BUG_ON(v.counter != r); 	INIT(onestwos);	BUG_ON(!atomic64_inc_not_zero(&v));	r += one;	BUG_ON(v.counter != r); 	INIT(0);	BUG_ON(atomic64_inc_not_zero(&v));	BUG_ON(v.counter != r); 	INIT(-one);	BUG_ON(!atomic64_inc_not_zero(&v));	r += one;	BUG_ON(v.counter != r); 	/* Confirm the return value fits in an int, even if the value doesn't */	INIT(v3);	r_int = atomic64_inc_not_zero(&v);	BUG_ON(!r_int);} static __init int test_atomics_init(void){	test_atomic();	test_atomic64(); #ifdef CONFIG_X86	pr_info("passed for %s platform %s CX8 and %s SSE\n",#ifdef CONFIG_X86_64		"x86-64",#elif defined(CONFIG_X86_CX8)		"i586+",#else		"i386+",#endif	       boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",	       boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");#else	pr_info("passed\n");#endif 	return 0;} static __exit void test_atomics_exit(void) {} module_init(test_atomics_init);module_exit(test_atomics_exit); MODULE_DESCRIPTION("Testsuite for atomic64_t functions");MODULE_LICENSE("GPL");