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 #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)                                \
  25 do {                                                            \
  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...)     \
  41 do {                                            \
  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)                         \
  49 do {                                                            \
  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)                          \
  58 do {                                                            \
  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)                  \
  67 do {                                                            \
  68         FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);           \
  69 } while (0)
  70
  71 #define FETCH_FAMILY_TEST(bit, op, c_op, val)                   \
  72 do {                                                            \
  73         FAMILY_TEST(TEST_FETCH, bit, op, c_op, val);            \
  74 } while (0)
  75
  76 #define TEST_ARGS(bit, op, init, ret, expect, args...)          \
  77 do {                                                            \
  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)                                \
  84 do {                                                                    \
  85         FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new);        \
  86 } while (0)
  87
  88 #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong)                      \
  89 do {                                                                    \
  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)                  \
  97 do {                                                    \
  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)                  \
 103 do {                                                    \
 104         FAMILY_TEST(TEST_ARGS, bit, dec_return,         \
 105                         i, (i) - one, (i) - one);       \
 106 } while (0)
 107
 108 static __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)
 151 static __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
 252 static __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
 275 static __exit void test_atomics_exit(void) {}
 276
 277 module_init(test_atomics_init);
 278 module_exit(test_atomics_exit);
 279
 280 MODULE_LICENSE("GPL");