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 #define TEST(bit, op, c_op, val)                                \
  20 do {                                                            \
  21         atomic##bit##_set(&v, v0);                              \
  22         r = v0;                                                 \
  23         atomic##bit##_##op(val, &v);                            \
  24         r c_op val;                                             \
  25         WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n",       \
  26                 (unsigned long long)atomic##bit##_read(&v),     \
  27                 (unsigned long long)r);                         \
  28 } while (0)
  29
  30 /*
  31  * Test for a atomic operation family,
  32  * @test should be a macro accepting parameters (bit, op, ...)
  33  */
  34
  35 #define FAMILY_TEST(test, bit, op, args...)     \
  36 do {                                            \
  37         test(bit, op, ##args);          \
  38         test(bit, op##_acquire, ##args);        \
  39         test(bit, op##_release, ##args);        \
  40         test(bit, op##_relaxed, ##args);        \
  41 } while (0)
  42
  43 #define TEST_RETURN(bit, op, c_op, val)                         \
  44 do {                                                            \
  45         atomic##bit##_set(&v, v0);                              \
  46         r = v0;                                                 \
  47         r c_op val;                                             \
  48         BUG_ON(atomic##bit##_##op(val, &v) != r);               \
  49         BUG_ON(atomic##bit##_read(&v) != r);                    \
  50 } while (0)
  51
  52 #define RETURN_FAMILY_TEST(bit, op, c_op, val)                  \
  53 do {                                                            \
  54         FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);           \
  55 } while (0)
  56
  57 #define TEST_ARGS(bit, op, init, ret, expect, args...)          \
  58 do {                                                            \
  59         atomic##bit##_set(&v, init);                            \
  60         BUG_ON(atomic##bit##_##op(&v, ##args) != ret);          \
  61         BUG_ON(atomic##bit##_read(&v) != expect);               \
  62 } while (0)
  63
  64 #define XCHG_FAMILY_TEST(bit, init, new)                                \
  65 do {                                                                    \
  66         FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new);        \
  67 } while (0)
  68
  69 #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong)                      \
  70 do {                                                                    \
  71         FAMILY_TEST(TEST_ARGS, bit, cmpxchg,                            \
  72                         init, init, new, init, new);                    \
  73         FAMILY_TEST(TEST_ARGS, bit, cmpxchg,                            \
  74                         init, init, init, wrong, new);                  \
  75 } while (0)
  76
  77 #define INC_RETURN_FAMILY_TEST(bit, i)                  \
  78 do {                                                    \
  79         FAMILY_TEST(TEST_ARGS, bit, inc_return,         \
  80                         i, (i) + one, (i) + one);       \
  81 } while (0)
  82
  83 #define DEC_RETURN_FAMILY_TEST(bit, i)                  \
  84 do {                                                    \
  85         FAMILY_TEST(TEST_ARGS, bit, dec_return,         \
  86                         i, (i) - one, (i) - one);       \
  87 } while (0)
  88
  89 static __init void test_atomic(void)
  90 {
  91         int v0 = 0xaaa31337;
  92         int v1 = 0xdeadbeef;
  93         int onestwos = 0x11112222;
  94         int one = 1;
  95
  96         atomic_t v;
  97         int r;
  98
  99         TEST(, add, +=, onestwos);
 100         TEST(, add, +=, -one);
 101         TEST(, sub, -=, onestwos);
 102         TEST(, sub, -=, -one);
 103         TEST(, or, |=, v1);
 104         TEST(, and, &=, v1);
 105         TEST(, xor, ^=, v1);
 106         TEST(, andnot, &= ~, v1);
 107
 108         RETURN_FAMILY_TEST(, add_return, +=, onestwos);
 109         RETURN_FAMILY_TEST(, add_return, +=, -one);
 110         RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
 111         RETURN_FAMILY_TEST(, sub_return, -=, -one);
 112
 113         INC_RETURN_FAMILY_TEST(, v0);
 114         DEC_RETURN_FAMILY_TEST(, v0);
 115
 116         XCHG_FAMILY_TEST(, v0, v1);
 117         CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
 118
 119 }
 120
 121 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
 122 static __init void test_atomic64(void)
 123 {
 124         long long v0 = 0xaaa31337c001d00dLL;
 125         long long v1 = 0xdeadbeefdeafcafeLL;
 126         long long v2 = 0xfaceabadf00df001LL;
 127         long long onestwos = 0x1111111122222222LL;
 128         long long one = 1LL;
 129
 130         atomic64_t v = ATOMIC64_INIT(v0);
 131         long long r = v0;
 132         BUG_ON(v.counter != r);
 133
 134         atomic64_set(&v, v1);
 135         r = v1;
 136         BUG_ON(v.counter != r);
 137         BUG_ON(atomic64_read(&v) != r);
 138
 139         TEST(64, add, +=, onestwos);
 140         TEST(64, add, +=, -one);
 141         TEST(64, sub, -=, onestwos);
 142         TEST(64, sub, -=, -one);
 143         TEST(64, or, |=, v1);
 144         TEST(64, and, &=, v1);
 145         TEST(64, xor, ^=, v1);
 146         TEST(64, andnot, &= ~, v1);
 147
 148         RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
 149         RETURN_FAMILY_TEST(64, add_return, +=, -one);
 150         RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
 151         RETURN_FAMILY_TEST(64, sub_return, -=, -one);
 152
 153         INIT(v0);
 154         atomic64_inc(&v);
 155         r += one;
 156         BUG_ON(v.counter != r);
 157
 158         INIT(v0);
 159         atomic64_dec(&v);
 160         r -= one;
 161         BUG_ON(v.counter != r);
 162
 163         INC_RETURN_FAMILY_TEST(64, v0);
 164         DEC_RETURN_FAMILY_TEST(64, v0);
 165
 166         XCHG_FAMILY_TEST(64, v0, v1);
 167         CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
 168
 169         INIT(v0);
 170         BUG_ON(atomic64_add_unless(&v, one, v0));
 171         BUG_ON(v.counter != r);
 172
 173         INIT(v0);
 174         BUG_ON(!atomic64_add_unless(&v, one, v1));
 175         r += one;
 176         BUG_ON(v.counter != r);
 177
 178 #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 179         INIT(onestwos);
 180         BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
 181         r -= one;
 182         BUG_ON(v.counter != r);
 183
 184         INIT(0);
 185         BUG_ON(atomic64_dec_if_positive(&v) != -one);
 186         BUG_ON(v.counter != r);
 187
 188         INIT(-one);
 189         BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
 190         BUG_ON(v.counter != r);
 191 #else
 192 #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
 193 #endif
 194
 195         INIT(onestwos);
 196         BUG_ON(!atomic64_inc_not_zero(&v));
 197         r += one;
 198         BUG_ON(v.counter != r);
 199
 200         INIT(0);
 201         BUG_ON(atomic64_inc_not_zero(&v));
 202         BUG_ON(v.counter != r);
 203
 204         INIT(-one);
 205         BUG_ON(!atomic64_inc_not_zero(&v));
 206         r += one;
 207         BUG_ON(v.counter != r);
 208 }
 209
 210 static __init int test_atomics(void)
 211 {
 212         test_atomic();
 213         test_atomic64();
 214
 215 #ifdef CONFIG_X86
 216         pr_info("passed for %s platform %s CX8 and %s SSE\n",
 217 #ifdef CONFIG_X86_64
 218                 "x86-64",
 219 #elif defined(CONFIG_X86_CMPXCHG64)
 220                 "i586+",
 221 #else
 222                 "i386+",
 223 #endif
 224                boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
 225                boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
 226 #else
 227         pr_info("passed\n");
 228 #endif
 229
 230         return 0;
 231 }
 232
 233 core_initcall(test_atomics);