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 RETURN_FAMILY_TEST(bit, op, c_op, val)                  \
  57 do {                                                            \
  58         FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);           \
  59 } while (0)
  60
  61 #define TEST_ARGS(bit, op, init, ret, expect, args...)          \
  62 do {                                                            \
  63         atomic##bit##_set(&v, init);                            \
  64         BUG_ON(atomic##bit##_##op(&v, ##args) != ret);          \
  65         BUG_ON(atomic##bit##_read(&v) != expect);               \
  66 } while (0)
  67
  68 #define XCHG_FAMILY_TEST(bit, init, new)                                \
  69 do {                                                                    \
  70         FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new);        \
  71 } while (0)
  72
  73 #define CMPXCHG_FAMILY_TEST(bit, init, new, wrong)                      \
  74 do {                                                                    \
  75         FAMILY_TEST(TEST_ARGS, bit, cmpxchg,                            \
  76                         init, init, new, init, new);                    \
  77         FAMILY_TEST(TEST_ARGS, bit, cmpxchg,                            \
  78                         init, init, init, wrong, new);                  \
  79 } while (0)
  80
  81 #define INC_RETURN_FAMILY_TEST(bit, i)                  \
  82 do {                                                    \
  83         FAMILY_TEST(TEST_ARGS, bit, inc_return,         \
  84                         i, (i) + one, (i) + one);       \
  85 } while (0)
  86
  87 #define DEC_RETURN_FAMILY_TEST(bit, i)                  \
  88 do {                                                    \
  89         FAMILY_TEST(TEST_ARGS, bit, dec_return,         \
  90                         i, (i) - one, (i) - one);       \
  91 } while (0)
  92
  93 static __init void test_atomic(void)
  94 {
  95         int v0 = 0xaaa31337;
  96         int v1 = 0xdeadbeef;
  97         int onestwos = 0x11112222;
  98         int one = 1;
  99
 100         atomic_t v;
 101         int r;
 102
 103         TEST(, add, +=, onestwos);
 104         TEST(, add, +=, -one);
 105         TEST(, sub, -=, onestwos);
 106         TEST(, sub, -=, -one);
 107         TEST(, or, |=, v1);
 108         TEST(, and, &=, v1);
 109         TEST(, xor, ^=, v1);
 110         TEST(, andnot, &= ~, v1);
 111
 112         RETURN_FAMILY_TEST(, add_return, +=, onestwos);
 113         RETURN_FAMILY_TEST(, add_return, +=, -one);
 114         RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
 115         RETURN_FAMILY_TEST(, sub_return, -=, -one);
 116
 117         INC_RETURN_FAMILY_TEST(, v0);
 118         DEC_RETURN_FAMILY_TEST(, v0);
 119
 120         XCHG_FAMILY_TEST(, v0, v1);
 121         CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
 122
 123 }
 124
 125 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
 126 static __init void test_atomic64(void)
 127 {
 128         long long v0 = 0xaaa31337c001d00dLL;
 129         long long v1 = 0xdeadbeefdeafcafeLL;
 130         long long v2 = 0xfaceabadf00df001LL;
 131         long long onestwos = 0x1111111122222222LL;
 132         long long one = 1LL;
 133
 134         atomic64_t v = ATOMIC64_INIT(v0);
 135         long long r = v0;
 136         BUG_ON(v.counter != r);
 137
 138         atomic64_set(&v, v1);
 139         r = v1;
 140         BUG_ON(v.counter != r);
 141         BUG_ON(atomic64_read(&v) != r);
 142
 143         TEST(64, add, +=, onestwos);
 144         TEST(64, add, +=, -one);
 145         TEST(64, sub, -=, onestwos);
 146         TEST(64, sub, -=, -one);
 147         TEST(64, or, |=, v1);
 148         TEST(64, and, &=, v1);
 149         TEST(64, xor, ^=, v1);
 150         TEST(64, andnot, &= ~, v1);
 151
 152         RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
 153         RETURN_FAMILY_TEST(64, add_return, +=, -one);
 154         RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
 155         RETURN_FAMILY_TEST(64, sub_return, -=, -one);
 156
 157         INIT(v0);
 158         atomic64_inc(&v);
 159         r += one;
 160         BUG_ON(v.counter != r);
 161
 162         INIT(v0);
 163         atomic64_dec(&v);
 164         r -= one;
 165         BUG_ON(v.counter != r);
 166
 167         INC_RETURN_FAMILY_TEST(64, v0);
 168         DEC_RETURN_FAMILY_TEST(64, v0);
 169
 170         XCHG_FAMILY_TEST(64, v0, v1);
 171         CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
 172
 173         INIT(v0);
 174         BUG_ON(atomic64_add_unless(&v, one, v0));
 175         BUG_ON(v.counter != r);
 176
 177         INIT(v0);
 178         BUG_ON(!atomic64_add_unless(&v, one, v1));
 179         r += one;
 180         BUG_ON(v.counter != r);
 181
 182 #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 183         INIT(onestwos);
 184         BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
 185         r -= one;
 186         BUG_ON(v.counter != r);
 187
 188         INIT(0);
 189         BUG_ON(atomic64_dec_if_positive(&v) != -one);
 190         BUG_ON(v.counter != r);
 191
 192         INIT(-one);
 193         BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
 194         BUG_ON(v.counter != r);
 195 #else
 196 #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
 197 #endif
 198
 199         INIT(onestwos);
 200         BUG_ON(!atomic64_inc_not_zero(&v));
 201         r += one;
 202         BUG_ON(v.counter != r);
 203
 204         INIT(0);
 205         BUG_ON(atomic64_inc_not_zero(&v));
 206         BUG_ON(v.counter != r);
 207
 208         INIT(-one);
 209         BUG_ON(!atomic64_inc_not_zero(&v));
 210         r += one;
 211         BUG_ON(v.counter != r);
 212 }
 213
 214 static __init int test_atomics(void)
 215 {
 216         test_atomic();
 217         test_atomic64();
 218
 219 #ifdef CONFIG_X86
 220         pr_info("passed for %s platform %s CX8 and %s SSE\n",
 221 #ifdef CONFIG_X86_64
 222                 "x86-64",
 223 #elif defined(CONFIG_X86_CMPXCHG64)
 224                 "i586+",
 225 #else
 226                 "i386+",
 227 #endif
 228                boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
 229                boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
 230 #else
 231         pr_info("passed\n");
 232 #endif
 233
 234         return 0;
 235 }
 236
 237 core_initcall(test_atomics);