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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/*
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
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/init.h>
15#include <linux/bug.h>
16#include <linux/kernel.h>
17#include <linux/atomic.h>
18#include <linux/module.h>
19
20#ifdef CONFIG_X86
21#include <asm/cpufeature.h> /* for boot_cpu_has below */
22#endif
23
24#define TEST(bit, op, c_op, val) \
25do { \
26 atomic##bit##_set(&v, v0); \
27 r = v0; \
28 atomic##bit##_##op(val, &v); \
29 r c_op val; \
30 WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n", \
31 (unsigned long long)atomic##bit##_read(&v), \
32 (unsigned long long)r); \
33} while (0)
34
35/*
36 * Test for a atomic operation family,
37 * @test should be a macro accepting parameters (bit, op, ...)
38 */
39
40#define FAMILY_TEST(test, bit, op, args...) \
41do { \
42 test(bit, op, ##args); \
43 test(bit, op##_acquire, ##args); \
44 test(bit, op##_release, ##args); \
45 test(bit, op##_relaxed, ##args); \
46} while (0)
47
48#define TEST_RETURN(bit, op, c_op, val) \
49do { \
50 atomic##bit##_set(&v, v0); \
51 r = v0; \
52 r c_op val; \
53 BUG_ON(atomic##bit##_##op(val, &v) != r); \
54 BUG_ON(atomic##bit##_read(&v) != r); \
55} while (0)
56
57#define TEST_FETCH(bit, op, c_op, val) \
58do { \
59 atomic##bit##_set(&v, v0); \
60 r = v0; \
61 r c_op val; \
62 BUG_ON(atomic##bit##_##op(val, &v) != v0); \
63 BUG_ON(atomic##bit##_read(&v) != r); \
64} while (0)
65
66#define RETURN_FAMILY_TEST(bit, op, c_op, val) \
67do { \
68 FAMILY_TEST(TEST_RETURN, bit, op, c_op, val); \
69} while (0)
70
71#define FETCH_FAMILY_TEST(bit, op, c_op, val) \
72do { \
73 FAMILY_TEST(TEST_FETCH, bit, op, c_op, val); \
74} while (0)
75
76#define TEST_ARGS(bit, op, init, ret, expect, args...) \
77do { \
78 atomic##bit##_set(&v, init); \
79 BUG_ON(atomic##bit##_##op(&v, ##args) != ret); \
80 BUG_ON(atomic##bit##_read(&v) != expect); \
81} while (0)
82
83#define XCHG_FAMILY_TEST(bit, init, new) \
84do { \
85 FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new); \
86} while (0)
87
88#define CMPXCHG_FAMILY_TEST(bit, init, new, wrong) \
89do { \
90 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
91 init, init, new, init, new); \
92 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
93 init, init, init, wrong, new); \
94} while (0)
95
96#define INC_RETURN_FAMILY_TEST(bit, i) \
97do { \
98 FAMILY_TEST(TEST_ARGS, bit, inc_return, \
99 i, (i) + one, (i) + one); \
100} while (0)
101
102#define DEC_RETURN_FAMILY_TEST(bit, i) \
103do { \
104 FAMILY_TEST(TEST_ARGS, bit, dec_return, \
105 i, (i) - one, (i) - one); \
106} while (0)
107
108static __init void test_atomic(void)
109{
110 int v0 = 0xaaa31337;
111 int v1 = 0xdeadbeef;
112 int onestwos = 0x11112222;
113 int one = 1;
114
115 atomic_t v;
116 int r;
117
118 TEST(, add, +=, onestwos);
119 TEST(, add, +=, -one);
120 TEST(, sub, -=, onestwos);
121 TEST(, sub, -=, -one);
122 TEST(, or, |=, v1);
123 TEST(, and, &=, v1);
124 TEST(, xor, ^=, v1);
125 TEST(, andnot, &= ~, v1);
126
127 RETURN_FAMILY_TEST(, add_return, +=, onestwos);
128 RETURN_FAMILY_TEST(, add_return, +=, -one);
129 RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
130 RETURN_FAMILY_TEST(, sub_return, -=, -one);
131
132 FETCH_FAMILY_TEST(, fetch_add, +=, onestwos);
133 FETCH_FAMILY_TEST(, fetch_add, +=, -one);
134 FETCH_FAMILY_TEST(, fetch_sub, -=, onestwos);
135 FETCH_FAMILY_TEST(, fetch_sub, -=, -one);
136
137 FETCH_FAMILY_TEST(, fetch_or, |=, v1);
138 FETCH_FAMILY_TEST(, fetch_and, &=, v1);
139 FETCH_FAMILY_TEST(, fetch_andnot, &= ~, v1);
140 FETCH_FAMILY_TEST(, fetch_xor, ^=, v1);
141
142 INC_RETURN_FAMILY_TEST(, v0);
143 DEC_RETURN_FAMILY_TEST(, v0);
144
145 XCHG_FAMILY_TEST(, v0, v1);
146 CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
147
148}
149
150#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
151static __init void test_atomic64(void)
152{
153 long long v0 = 0xaaa31337c001d00dLL;
154 long long v1 = 0xdeadbeefdeafcafeLL;
155 long long v2 = 0xfaceabadf00df001LL;
156 long long v3 = 0x8000000000000000LL;
157 long long onestwos = 0x1111111122222222LL;
158 long long one = 1LL;
159 int r_int;
160
161 atomic64_t v = ATOMIC64_INIT(v0);
162 long long r = v0;
163 BUG_ON(v.counter != r);
164
165 atomic64_set(&v, v1);
166 r = v1;
167 BUG_ON(v.counter != r);
168 BUG_ON(atomic64_read(&v) != r);
169
170 TEST(64, add, +=, onestwos);
171 TEST(64, add, +=, -one);
172 TEST(64, sub, -=, onestwos);
173 TEST(64, sub, -=, -one);
174 TEST(64, or, |=, v1);
175 TEST(64, and, &=, v1);
176 TEST(64, xor, ^=, v1);
177 TEST(64, andnot, &= ~, v1);
178
179 RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
180 RETURN_FAMILY_TEST(64, add_return, +=, -one);
181 RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
182 RETURN_FAMILY_TEST(64, sub_return, -=, -one);
183
184 FETCH_FAMILY_TEST(64, fetch_add, +=, onestwos);
185 FETCH_FAMILY_TEST(64, fetch_add, +=, -one);
186 FETCH_FAMILY_TEST(64, fetch_sub, -=, onestwos);
187 FETCH_FAMILY_TEST(64, fetch_sub, -=, -one);
188
189 FETCH_FAMILY_TEST(64, fetch_or, |=, v1);
190 FETCH_FAMILY_TEST(64, fetch_and, &=, v1);
191 FETCH_FAMILY_TEST(64, fetch_andnot, &= ~, v1);
192 FETCH_FAMILY_TEST(64, fetch_xor, ^=, v1);
193
194 INIT(v0);
195 atomic64_inc(&v);
196 r += one;
197 BUG_ON(v.counter != r);
198
199 INIT(v0);
200 atomic64_dec(&v);
201 r -= one;
202 BUG_ON(v.counter != r);
203
204 INC_RETURN_FAMILY_TEST(64, v0);
205 DEC_RETURN_FAMILY_TEST(64, v0);
206
207 XCHG_FAMILY_TEST(64, v0, v1);
208 CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
209
210 INIT(v0);
211 BUG_ON(atomic64_add_unless(&v, one, v0));
212 BUG_ON(v.counter != r);
213
214 INIT(v0);
215 BUG_ON(!atomic64_add_unless(&v, one, v1));
216 r += one;
217 BUG_ON(v.counter != r);
218
219 INIT(onestwos);
220 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
221 r -= one;
222 BUG_ON(v.counter != r);
223
224 INIT(0);
225 BUG_ON(atomic64_dec_if_positive(&v) != -one);
226 BUG_ON(v.counter != r);
227
228 INIT(-one);
229 BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
230 BUG_ON(v.counter != r);
231
232 INIT(onestwos);
233 BUG_ON(!atomic64_inc_not_zero(&v));
234 r += one;
235 BUG_ON(v.counter != r);
236
237 INIT(0);
238 BUG_ON(atomic64_inc_not_zero(&v));
239 BUG_ON(v.counter != r);
240
241 INIT(-one);
242 BUG_ON(!atomic64_inc_not_zero(&v));
243 r += one;
244 BUG_ON(v.counter != r);
245
246 /* Confirm the return value fits in an int, even if the value doesn't */
247 INIT(v3);
248 r_int = atomic64_inc_not_zero(&v);
249 BUG_ON(!r_int);
250}
251
252static __init int test_atomics_init(void)
253{
254 test_atomic();
255 test_atomic64();
256
257#ifdef CONFIG_X86
258 pr_info("passed for %s platform %s CX8 and %s SSE\n",
259#ifdef CONFIG_X86_64
260 "x86-64",
261#elif defined(CONFIG_X86_CMPXCHG64)
262 "i586+",
263#else
264 "i386+",
265#endif
266 boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
267 boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
268#else
269 pr_info("passed\n");
270#endif
271
272 return 0;
273}
274
275static __exit void test_atomics_exit(void) {}
276
277module_init(test_atomics_init);
278module_exit(test_atomics_exit);
279
280MODULE_LICENSE("GPL");