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 #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);