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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
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
19 #ifdef CONFIG_X86
20 #include <asm/cpufeature.h> /* for boot_cpu_has below */
21 #endif
22
23 #define TEST(bit, op, c_op, val) \
24 do { \
25 atomic##bit##_set(&v, v0); \
26 r = v0; \
27 atomic##bit##_##op(val, &v); \
28 r c_op val; \
29 WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n", \
30 (unsigned long long)atomic##bit##_read(&v), \
31 (unsigned long long)r); \
32 } while (0)
33
34 /*
35 * Test for a atomic operation family,
36 * @test should be a macro accepting parameters (bit, op, ...)
37 */
38
39 #define FAMILY_TEST(test, bit, op, args...) \
40 do { \
41 test(bit, op, ##args); \
42 test(bit, op##_acquire, ##args); \
43 test(bit, op##_release, ##args); \
44 test(bit, op##_relaxed, ##args); \
45 } while (0)
46
47 #define TEST_RETURN(bit, op, c_op, val) \
48 do { \
49 atomic##bit##_set(&v, v0); \
50 r = v0; \
51 r c_op val; \
52 BUG_ON(atomic##bit##_##op(val, &v) != r); \
53 BUG_ON(atomic##bit##_read(&v) != r); \
54 } while (0)
55
56 #define TEST_FETCH(bit, op, c_op, val) \
57 do { \
58 atomic##bit##_set(&v, v0); \
59 r = v0; \
60 r c_op val; \
61 BUG_ON(atomic##bit##_##op(val, &v) != v0); \
62 BUG_ON(atomic##bit##_read(&v) != r); \
63 } while (0)
64
65 #define RETURN_FAMILY_TEST(bit, op, c_op, val) \
66 do { \
67 FAMILY_TEST(TEST_RETURN, bit, op, c_op, val); \
68 } while (0)
69
70 #define FETCH_FAMILY_TEST(bit, op, c_op, val) \
71 do { \
72 FAMILY_TEST(TEST_FETCH, bit, op, c_op, val); \
73 } while (0)
74
75 #define TEST_ARGS(bit, op, init, ret, expect, args...) \
76 do { \
77 atomic##bit##_set(&v, init); \
78 BUG_ON(atomic##bit##_##op(&v, ##args) != ret); \
79 BUG_ON(atomic##bit##_read(&v) != expect); \
80 } while (0)
81
82 #define XCHG_FAMILY_TEST(bit, init, new) \
83 do { \
84 FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new); \
85 } while (0)
86
87 #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong) \
88 do { \
89 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
90 init, init, new, init, new); \
91 FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
92 init, init, init, wrong, new); \
93 } while (0)
94
95 #define INC_RETURN_FAMILY_TEST(bit, i) \
96 do { \
97 FAMILY_TEST(TEST_ARGS, bit, inc_return, \
98 i, (i) + one, (i) + one); \
99 } while (0)
100
101 #define DEC_RETURN_FAMILY_TEST(bit, i) \
102 do { \
103 FAMILY_TEST(TEST_ARGS, bit, dec_return, \
104 i, (i) - one, (i) - one); \
105 } while (0)
106
107 static __init void test_atomic(void)
108 {
109 int v0 = 0xaaa31337;
110 int v1 = 0xdeadbeef;
111 int onestwos = 0x11112222;
112 int one = 1;
113
114 atomic_t v;
115 int r;
116
117 TEST(, add, +=, onestwos);
118 TEST(, add, +=, -one);
119 TEST(, sub, -=, onestwos);
120 TEST(, sub, -=, -one);
121 TEST(, or, |=, v1);
122 TEST(, and, &=, v1);
123 TEST(, xor, ^=, v1);
124 TEST(, andnot, &= ~, v1);
125
126 RETURN_FAMILY_TEST(, add_return, +=, onestwos);
127 RETURN_FAMILY_TEST(, add_return, +=, -one);
128 RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
129 RETURN_FAMILY_TEST(, sub_return, -=, -one);
130
131 FETCH_FAMILY_TEST(, fetch_add, +=, onestwos);
132 FETCH_FAMILY_TEST(, fetch_add, +=, -one);
133 FETCH_FAMILY_TEST(, fetch_sub, -=, onestwos);
134 FETCH_FAMILY_TEST(, fetch_sub, -=, -one);
135
136 FETCH_FAMILY_TEST(, fetch_or, |=, v1);
137 FETCH_FAMILY_TEST(, fetch_and, &=, v1);
138 FETCH_FAMILY_TEST(, fetch_andnot, &= ~, v1);
139 FETCH_FAMILY_TEST(, fetch_xor, ^=, v1);
140
141 INC_RETURN_FAMILY_TEST(, v0);
142 DEC_RETURN_FAMILY_TEST(, v0);
143
144 XCHG_FAMILY_TEST(, v0, v1);
145 CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
146
147 }
148
149 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
150 static __init void test_atomic64(void)
151 {
152 long long v0 = 0xaaa31337c001d00dLL;
153 long long v1 = 0xdeadbeefdeafcafeLL;
154 long long v2 = 0xfaceabadf00df001LL;
155 long long onestwos = 0x1111111122222222LL;
156 long long one = 1LL;
157
158 atomic64_t v = ATOMIC64_INIT(v0);
159 long long r = v0;
160 BUG_ON(v.counter != r);
161
162 atomic64_set(&v, v1);
163 r = v1;
164 BUG_ON(v.counter != r);
165 BUG_ON(atomic64_read(&v) != r);
166
167 TEST(64, add, +=, onestwos);
168 TEST(64, add, +=, -one);
169 TEST(64, sub, -=, onestwos);
170 TEST(64, sub, -=, -one);
171 TEST(64, or, |=, v1);
172 TEST(64, and, &=, v1);
173 TEST(64, xor, ^=, v1);
174 TEST(64, andnot, &= ~, v1);
175
176 RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
177 RETURN_FAMILY_TEST(64, add_return, +=, -one);
178 RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
179 RETURN_FAMILY_TEST(64, sub_return, -=, -one);
180
181 FETCH_FAMILY_TEST(64, fetch_add, +=, onestwos);
182 FETCH_FAMILY_TEST(64, fetch_add, +=, -one);
183 FETCH_FAMILY_TEST(64, fetch_sub, -=, onestwos);
184 FETCH_FAMILY_TEST(64, fetch_sub, -=, -one);
185
186 FETCH_FAMILY_TEST(64, fetch_or, |=, v1);
187 FETCH_FAMILY_TEST(64, fetch_and, &=, v1);
188 FETCH_FAMILY_TEST(64, fetch_andnot, &= ~, v1);
189 FETCH_FAMILY_TEST(64, fetch_xor, ^=, v1);
190
191 INIT(v0);
192 atomic64_inc(&v);
193 r += one;
194 BUG_ON(v.counter != r);
195
196 INIT(v0);
197 atomic64_dec(&v);
198 r -= one;
199 BUG_ON(v.counter != r);
200
201 INC_RETURN_FAMILY_TEST(64, v0);
202 DEC_RETURN_FAMILY_TEST(64, v0);
203
204 XCHG_FAMILY_TEST(64, v0, v1);
205 CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
206
207 INIT(v0);
208 BUG_ON(atomic64_add_unless(&v, one, v0));
209 BUG_ON(v.counter != r);
210
211 INIT(v0);
212 BUG_ON(!atomic64_add_unless(&v, one, v1));
213 r += one;
214 BUG_ON(v.counter != r);
215
216 #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
217 INIT(onestwos);
218 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
219 r -= one;
220 BUG_ON(v.counter != r);
221
222 INIT(0);
223 BUG_ON(atomic64_dec_if_positive(&v) != -one);
224 BUG_ON(v.counter != r);
225
226 INIT(-one);
227 BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
228 BUG_ON(v.counter != r);
229 #else
230 #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
231 #endif
232
233 INIT(onestwos);
234 BUG_ON(!atomic64_inc_not_zero(&v));
235 r += one;
236 BUG_ON(v.counter != r);
237
238 INIT(0);
239 BUG_ON(atomic64_inc_not_zero(&v));
240 BUG_ON(v.counter != r);
241
242 INIT(-one);
243 BUG_ON(!atomic64_inc_not_zero(&v));
244 r += one;
245 BUG_ON(v.counter != r);
246 }
247
248 static __init int test_atomics(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
271 core_initcall(test_atomics);