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 static __init void test_atomic(void)
  31 {
  32         int v0 = 0xaaa31337;
  33         int v1 = 0xdeadbeef;
  34         int onestwos = 0x11112222;
  35         int one = 1;
  36
  37         atomic_t v;
  38         int r;
  39
  40         TEST(, add, +=, onestwos);
  41         TEST(, add, +=, -one);
  42         TEST(, sub, -=, onestwos);
  43         TEST(, sub, -=, -one);
  44         TEST(, or, |=, v1);
  45         TEST(, and, &=, v1);
  46         TEST(, xor, ^=, v1);
  47         TEST(, andnot, &= ~, v1);
  48 }
  49
  50 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
  51 static __init void test_atomic64(void)
  52 {
  53         long long v0 = 0xaaa31337c001d00dLL;
  54         long long v1 = 0xdeadbeefdeafcafeLL;
  55         long long v2 = 0xfaceabadf00df001LL;
  56         long long onestwos = 0x1111111122222222LL;
  57         long long one = 1LL;
  58
  59         atomic64_t v = ATOMIC64_INIT(v0);
  60         long long r = v0;
  61         BUG_ON(v.counter != r);
  62
  63         atomic64_set(&v, v1);
  64         r = v1;
  65         BUG_ON(v.counter != r);
  66         BUG_ON(atomic64_read(&v) != r);
  67
  68         TEST(64, add, +=, onestwos);
  69         TEST(64, add, +=, -one);
  70         TEST(64, sub, -=, onestwos);
  71         TEST(64, sub, -=, -one);
  72         TEST(64, or, |=, v1);
  73         TEST(64, and, &=, v1);
  74         TEST(64, xor, ^=, v1);
  75         TEST(64, andnot, &= ~, v1);
  76
  77         INIT(v0);
  78         r += onestwos;
  79         BUG_ON(atomic64_add_return(onestwos, &v) != r);
  80         BUG_ON(v.counter != r);
  81
  82         INIT(v0);
  83         r += -one;
  84         BUG_ON(atomic64_add_return(-one, &v) != r);
  85         BUG_ON(v.counter != r);
  86
  87         INIT(v0);
  88         r -= onestwos;
  89         BUG_ON(atomic64_sub_return(onestwos, &v) != r);
  90         BUG_ON(v.counter != r);
  91
  92         INIT(v0);
  93         r -= -one;
  94         BUG_ON(atomic64_sub_return(-one, &v) != r);
  95         BUG_ON(v.counter != r);
  96
  97         INIT(v0);
  98         atomic64_inc(&v);
  99         r += one;
 100         BUG_ON(v.counter != r);
 101
 102         INIT(v0);
 103         r += one;
 104         BUG_ON(atomic64_inc_return(&v) != r);
 105         BUG_ON(v.counter != r);
 106
 107         INIT(v0);
 108         atomic64_dec(&v);
 109         r -= one;
 110         BUG_ON(v.counter != r);
 111
 112         INIT(v0);
 113         r -= one;
 114         BUG_ON(atomic64_dec_return(&v) != r);
 115         BUG_ON(v.counter != r);
 116
 117         INIT(v0);
 118         BUG_ON(atomic64_xchg(&v, v1) != v0);
 119         r = v1;
 120         BUG_ON(v.counter != r);
 121
 122         INIT(v0);
 123         BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
 124         r = v1;
 125         BUG_ON(v.counter != r);
 126
 127         INIT(v0);
 128         BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
 129         BUG_ON(v.counter != r);
 130
 131         INIT(v0);
 132         BUG_ON(atomic64_add_unless(&v, one, v0));
 133         BUG_ON(v.counter != r);
 134
 135         INIT(v0);
 136         BUG_ON(!atomic64_add_unless(&v, one, v1));
 137         r += one;
 138         BUG_ON(v.counter != r);
 139
 140 #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 141         INIT(onestwos);
 142         BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
 143         r -= one;
 144         BUG_ON(v.counter != r);
 145
 146         INIT(0);
 147         BUG_ON(atomic64_dec_if_positive(&v) != -one);
 148         BUG_ON(v.counter != r);
 149
 150         INIT(-one);
 151         BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
 152         BUG_ON(v.counter != r);
 153 #else
 154 #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
 155 #endif
 156
 157         INIT(onestwos);
 158         BUG_ON(!atomic64_inc_not_zero(&v));
 159         r += one;
 160         BUG_ON(v.counter != r);
 161
 162         INIT(0);
 163         BUG_ON(atomic64_inc_not_zero(&v));
 164         BUG_ON(v.counter != r);
 165
 166         INIT(-one);
 167         BUG_ON(!atomic64_inc_not_zero(&v));
 168         r += one;
 169         BUG_ON(v.counter != r);
 170 }
 171
 172 static __init int test_atomics(void)
 173 {
 174         test_atomic();
 175         test_atomic64();
 176
 177 #ifdef CONFIG_X86
 178         pr_info("passed for %s platform %s CX8 and %s SSE\n",
 179 #ifdef CONFIG_X86_64
 180                 "x86-64",
 181 #elif defined(CONFIG_X86_CMPXCHG64)
 182                 "i586+",
 183 #else
 184                 "i386+",
 185 #endif
 186                boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
 187                boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
 188 #else
 189         pr_info("passed\n");
 190 #endif
 191
 192         return 0;
 193 }
 194
 195 core_initcall(test_atomics);