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Linux/lib/atomic64_test.c

  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         INIT(onestwos);
217         BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
218         r -= one;
219         BUG_ON(v.counter != r);
220 
221         INIT(0);
222         BUG_ON(atomic64_dec_if_positive(&v) != -one);
223         BUG_ON(v.counter != r);
224 
225         INIT(-one);
226         BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
227         BUG_ON(v.counter != r);
228 
229         INIT(onestwos);
230         BUG_ON(!atomic64_inc_not_zero(&v));
231         r += one;
232         BUG_ON(v.counter != r);
233 
234         INIT(0);
235         BUG_ON(atomic64_inc_not_zero(&v));
236         BUG_ON(v.counter != r);
237 
238         INIT(-one);
239         BUG_ON(!atomic64_inc_not_zero(&v));
240         r += one;
241         BUG_ON(v.counter != r);
242 }
243 
244 static __init int test_atomics(void)
245 {
246         test_atomic();
247         test_atomic64();
248 
249 #ifdef CONFIG_X86
250         pr_info("passed for %s platform %s CX8 and %s SSE\n",
251 #ifdef CONFIG_X86_64
252                 "x86-64",
253 #elif defined(CONFIG_X86_CMPXCHG64)
254                 "i586+",
255 #else
256                 "i386+",
257 #endif
258                boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
259                boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
260 #else
261         pr_info("passed\n");
262 #endif
263 
264         return 0;
265 }
266 
267 core_initcall(test_atomics);
268 

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