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1/*
2 * Testsuite for atomic64_t functions
3 *
4 * Copyright © 2010 Luca Barbieri
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11#include <linux/init.h>
12#include <linux/bug.h>
13#include <linux/kernel.h>
14#include <linux/atomic.h>
15
16#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
17static __init int test_atomic64(void)
18{
19 long long v0 = 0xaaa31337c001d00dLL;
20 long long v1 = 0xdeadbeefdeafcafeLL;
21 long long v2 = 0xfaceabadf00df001LL;
22 long long onestwos = 0x1111111122222222LL;
23 long long one = 1LL;
24
25 atomic64_t v = ATOMIC64_INIT(v0);
26 long long r = v0;
27 BUG_ON(v.counter != r);
28
29 atomic64_set(&v, v1);
30 r = v1;
31 BUG_ON(v.counter != r);
32 BUG_ON(atomic64_read(&v) != r);
33
34 INIT(v0);
35 atomic64_add(onestwos, &v);
36 r += onestwos;
37 BUG_ON(v.counter != r);
38
39 INIT(v0);
40 atomic64_add(-one, &v);
41 r += -one;
42 BUG_ON(v.counter != r);
43
44 INIT(v0);
45 r += onestwos;
46 BUG_ON(atomic64_add_return(onestwos, &v) != r);
47 BUG_ON(v.counter != r);
48
49 INIT(v0);
50 r += -one;
51 BUG_ON(atomic64_add_return(-one, &v) != r);
52 BUG_ON(v.counter != r);
53
54 INIT(v0);
55 atomic64_sub(onestwos, &v);
56 r -= onestwos;
57 BUG_ON(v.counter != r);
58
59 INIT(v0);
60 atomic64_sub(-one, &v);
61 r -= -one;
62 BUG_ON(v.counter != r);
63
64 INIT(v0);
65 r -= onestwos;
66 BUG_ON(atomic64_sub_return(onestwos, &v) != r);
67 BUG_ON(v.counter != r);
68
69 INIT(v0);
70 r -= -one;
71 BUG_ON(atomic64_sub_return(-one, &v) != r);
72 BUG_ON(v.counter != r);
73
74 INIT(v0);
75 atomic64_inc(&v);
76 r += one;
77 BUG_ON(v.counter != r);
78
79 INIT(v0);
80 r += one;
81 BUG_ON(atomic64_inc_return(&v) != r);
82 BUG_ON(v.counter != r);
83
84 INIT(v0);
85 atomic64_dec(&v);
86 r -= one;
87 BUG_ON(v.counter != r);
88
89 INIT(v0);
90 r -= one;
91 BUG_ON(atomic64_dec_return(&v) != r);
92 BUG_ON(v.counter != r);
93
94 INIT(v0);
95 BUG_ON(atomic64_xchg(&v, v1) != v0);
96 r = v1;
97 BUG_ON(v.counter != r);
98
99 INIT(v0);
100 BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
101 r = v1;
102 BUG_ON(v.counter != r);
103
104 INIT(v0);
105 BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
106 BUG_ON(v.counter != r);
107
108 INIT(v0);
109 BUG_ON(atomic64_add_unless(&v, one, v0));
110 BUG_ON(v.counter != r);
111
112 INIT(v0);
113 BUG_ON(!atomic64_add_unless(&v, one, v1));
114 r += one;
115 BUG_ON(v.counter != r);
116
117#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
118 INIT(onestwos);
119 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
120 r -= one;
121 BUG_ON(v.counter != r);
122
123 INIT(0);
124 BUG_ON(atomic64_dec_if_positive(&v) != -one);
125 BUG_ON(v.counter != r);
126
127 INIT(-one);
128 BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
129 BUG_ON(v.counter != r);
130#else
131#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
132#endif
133
134 INIT(onestwos);
135 BUG_ON(!atomic64_inc_not_zero(&v));
136 r += one;
137 BUG_ON(v.counter != r);
138
139 INIT(0);
140 BUG_ON(atomic64_inc_not_zero(&v));
141 BUG_ON(v.counter != r);
142
143 INIT(-one);
144 BUG_ON(!atomic64_inc_not_zero(&v));
145 r += one;
146 BUG_ON(v.counter != r);
147
148#ifdef CONFIG_X86
149 printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE\n",
150#ifdef CONFIG_X86_64
151 "x86-64",
152#elif defined(CONFIG_X86_CMPXCHG64)
153 "i586+",
154#else
155 "i386+",
156#endif
157 boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
158 boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
159#else
160 printk(KERN_INFO "atomic64 test passed\n");
161#endif
162
163 return 0;
164}
165
166core_initcall(test_atomic64);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Testsuite for atomic64_t functions
4 *
5 * Copyright © 2010 Luca Barbieri
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/init.h>
11#include <linux/bug.h>
12#include <linux/kernel.h>
13#include <linux/atomic.h>
14#include <linux/module.h>
15
16#ifdef CONFIG_X86
17#include <asm/cpufeature.h> /* for boot_cpu_has below */
18#endif
19
20#define TEST(bit, op, c_op, val) \
21do { \
22 atomic##bit##_set(&v, v0); \
23 r = v0; \
24 atomic##bit##_##op(val, &v); \
25 r c_op val; \
26 WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n", \
27 (unsigned long long)atomic##bit##_read(&v), \
28 (unsigned long long)r); \
29} while (0)
30
31/*
32 * Test for a atomic operation family,
33 * @test should be a macro accepting parameters (bit, op, ...)
34 */
35
36#define FAMILY_TEST(test, bit, op, args...) \
37do { \
38 test(bit, op, ##args); \
39 test(bit, op##_acquire, ##args); \
40 test(bit, op##_release, ##args); \
41 test(bit, op##_relaxed, ##args); \
42} while (0)
43
44#define TEST_RETURN(bit, op, c_op, val) \
45do { \
46 atomic##bit##_set(&v, v0); \
47 r = v0; \
48 r c_op val; \
49 BUG_ON(atomic##bit##_##op(val, &v) != r); \
50 BUG_ON(atomic##bit##_read(&v) != r); \
51} while (0)
52
53#define TEST_FETCH(bit, op, c_op, val) \
54do { \
55 atomic##bit##_set(&v, v0); \
56 r = v0; \
57 r c_op val; \
58 BUG_ON(atomic##bit##_##op(val, &v) != v0); \
59 BUG_ON(atomic##bit##_read(&v) != r); \
60} while (0)
61
62#define RETURN_FAMILY_TEST(bit, op, c_op, val) \
63do { \
64 FAMILY_TEST(TEST_RETURN, bit, op, c_op, val); \
65} while (0)
66
67#define FETCH_FAMILY_TEST(bit, op, c_op, val) \
68do { \
69 FAMILY_TEST(TEST_FETCH, bit, op, c_op, val); \
70} while (0)
71
72#define TEST_ARGS(bit, op, init, ret, expect, args...) \
73do { \
74 atomic##bit##_set(&v, init); \
75 BUG_ON(atomic##bit##_##op(&v, ##args) != ret); \
76 BUG_ON(atomic##bit##_read(&v) != expect); \
77} while (0)
78
79#define XCHG_FAMILY_TEST(bit, init, new) \
80do { \
81 FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new); \
82} while (0)
83
84#define CMPXCHG_FAMILY_TEST(bit, init, new, wrong) \
85do { \
86 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
87 init, init, new, init, new); \
88 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
89 init, init, init, wrong, new); \
90} while (0)
91
92#define INC_RETURN_FAMILY_TEST(bit, i) \
93do { \
94 FAMILY_TEST(TEST_ARGS, bit, inc_return, \
95 i, (i) + one, (i) + one); \
96} while (0)
97
98#define DEC_RETURN_FAMILY_TEST(bit, i) \
99do { \
100 FAMILY_TEST(TEST_ARGS, bit, dec_return, \
101 i, (i) - one, (i) - one); \
102} while (0)
103
104static __init void test_atomic(void)
105{
106 int v0 = 0xaaa31337;
107 int v1 = 0xdeadbeef;
108 int onestwos = 0x11112222;
109 int one = 1;
110
111 atomic_t v;
112 int r;
113
114 TEST(, add, +=, onestwos);
115 TEST(, add, +=, -one);
116 TEST(, sub, -=, onestwos);
117 TEST(, sub, -=, -one);
118 TEST(, or, |=, v1);
119 TEST(, and, &=, v1);
120 TEST(, xor, ^=, v1);
121 TEST(, andnot, &= ~, v1);
122
123 RETURN_FAMILY_TEST(, add_return, +=, onestwos);
124 RETURN_FAMILY_TEST(, add_return, +=, -one);
125 RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
126 RETURN_FAMILY_TEST(, sub_return, -=, -one);
127
128 FETCH_FAMILY_TEST(, fetch_add, +=, onestwos);
129 FETCH_FAMILY_TEST(, fetch_add, +=, -one);
130 FETCH_FAMILY_TEST(, fetch_sub, -=, onestwos);
131 FETCH_FAMILY_TEST(, fetch_sub, -=, -one);
132
133 FETCH_FAMILY_TEST(, fetch_or, |=, v1);
134 FETCH_FAMILY_TEST(, fetch_and, &=, v1);
135 FETCH_FAMILY_TEST(, fetch_andnot, &= ~, v1);
136 FETCH_FAMILY_TEST(, fetch_xor, ^=, v1);
137
138 INC_RETURN_FAMILY_TEST(, v0);
139 DEC_RETURN_FAMILY_TEST(, v0);
140
141 XCHG_FAMILY_TEST(, v0, v1);
142 CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
143
144}
145
146#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
147static __init void test_atomic64(void)
148{
149 long long v0 = 0xaaa31337c001d00dLL;
150 long long v1 = 0xdeadbeefdeafcafeLL;
151 long long v2 = 0xfaceabadf00df001LL;
152 long long v3 = 0x8000000000000000LL;
153 long long onestwos = 0x1111111122222222LL;
154 long long one = 1LL;
155 int r_int;
156
157 atomic64_t v = ATOMIC64_INIT(v0);
158 long long r = v0;
159 BUG_ON(v.counter != r);
160
161 atomic64_set(&v, v1);
162 r = v1;
163 BUG_ON(v.counter != r);
164 BUG_ON(atomic64_read(&v) != r);
165
166 TEST(64, add, +=, onestwos);
167 TEST(64, add, +=, -one);
168 TEST(64, sub, -=, onestwos);
169 TEST(64, sub, -=, -one);
170 TEST(64, or, |=, v1);
171 TEST(64, and, &=, v1);
172 TEST(64, xor, ^=, v1);
173 TEST(64, andnot, &= ~, v1);
174
175 RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
176 RETURN_FAMILY_TEST(64, add_return, +=, -one);
177 RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
178 RETURN_FAMILY_TEST(64, sub_return, -=, -one);
179
180 FETCH_FAMILY_TEST(64, fetch_add, +=, onestwos);
181 FETCH_FAMILY_TEST(64, fetch_add, +=, -one);
182 FETCH_FAMILY_TEST(64, fetch_sub, -=, onestwos);
183 FETCH_FAMILY_TEST(64, fetch_sub, -=, -one);
184
185 FETCH_FAMILY_TEST(64, fetch_or, |=, v1);
186 FETCH_FAMILY_TEST(64, fetch_and, &=, v1);
187 FETCH_FAMILY_TEST(64, fetch_andnot, &= ~, v1);
188 FETCH_FAMILY_TEST(64, fetch_xor, ^=, v1);
189
190 INIT(v0);
191 atomic64_inc(&v);
192 r += one;
193 BUG_ON(v.counter != r);
194
195 INIT(v0);
196 atomic64_dec(&v);
197 r -= one;
198 BUG_ON(v.counter != r);
199
200 INC_RETURN_FAMILY_TEST(64, v0);
201 DEC_RETURN_FAMILY_TEST(64, v0);
202
203 XCHG_FAMILY_TEST(64, v0, v1);
204 CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
205
206 INIT(v0);
207 BUG_ON(atomic64_add_unless(&v, one, v0));
208 BUG_ON(v.counter != r);
209
210 INIT(v0);
211 BUG_ON(!atomic64_add_unless(&v, one, v1));
212 r += one;
213 BUG_ON(v.counter != r);
214
215 INIT(onestwos);
216 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
217 r -= one;
218 BUG_ON(v.counter != r);
219
220 INIT(0);
221 BUG_ON(atomic64_dec_if_positive(&v) != -one);
222 BUG_ON(v.counter != r);
223
224 INIT(-one);
225 BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
226 BUG_ON(v.counter != r);
227
228 INIT(onestwos);
229 BUG_ON(!atomic64_inc_not_zero(&v));
230 r += one;
231 BUG_ON(v.counter != r);
232
233 INIT(0);
234 BUG_ON(atomic64_inc_not_zero(&v));
235 BUG_ON(v.counter != r);
236
237 INIT(-one);
238 BUG_ON(!atomic64_inc_not_zero(&v));
239 r += one;
240 BUG_ON(v.counter != r);
241
242 /* Confirm the return value fits in an int, even if the value doesn't */
243 INIT(v3);
244 r_int = atomic64_inc_not_zero(&v);
245 BUG_ON(!r_int);
246}
247
248static __init int test_atomics_init(void)
249{
250 test_atomic();
251 test_atomic64();
252
253#ifdef CONFIG_X86
254 pr_info("passed for %s platform %s CX8 and %s SSE\n",
255#ifdef CONFIG_X86_64
256 "x86-64",
257#elif defined(CONFIG_X86_CMPXCHG64)
258 "i586+",
259#else
260 "i386+",
261#endif
262 boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
263 boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
264#else
265 pr_info("passed\n");
266#endif
267
268 return 0;
269}
270
271static __exit void test_atomics_exit(void) {}
272
273module_init(test_atomics_init);
274module_exit(test_atomics_exit);
275
276MODULE_LICENSE("GPL");