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#include <linux/init.h>
12#include <linux/kernel.h>
13#include <asm/atomic.h>
14
15#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
16static __init int test_atomic64(void)
17{
18	long long v0 = 0xaaa31337c001d00dLL;
19	long long v1 = 0xdeadbeefdeafcafeLL;
20	long long v2 = 0xfaceabadf00df001LL;
21	long long onestwos = 0x1111111122222222LL;
22	long long one = 1LL;
23
24	atomic64_t v = ATOMIC64_INIT(v0);
25	long long r = v0;
26	BUG_ON(v.counter != r);
27
28	atomic64_set(&v, v1);
29	r = v1;
30	BUG_ON(v.counter != r);
31	BUG_ON(atomic64_read(&v) != r);
32
33	INIT(v0);
34	atomic64_add(onestwos, &v);
35	r += onestwos;
36	BUG_ON(v.counter != r);
37
38	INIT(v0);
39	atomic64_add(-one, &v);
40	r += -one;
41	BUG_ON(v.counter != r);
42
43	INIT(v0);
44	r += onestwos;
45	BUG_ON(atomic64_add_return(onestwos, &v) != r);
46	BUG_ON(v.counter != r);
47
48	INIT(v0);
49	r += -one;
50	BUG_ON(atomic64_add_return(-one, &v) != r);
51	BUG_ON(v.counter != r);
52
53	INIT(v0);
54	atomic64_sub(onestwos, &v);
55	r -= onestwos;
56	BUG_ON(v.counter != r);
57
58	INIT(v0);
59	atomic64_sub(-one, &v);
60	r -= -one;
61	BUG_ON(v.counter != r);
62
63	INIT(v0);
64	r -= onestwos;
65	BUG_ON(atomic64_sub_return(onestwos, &v) != r);
66	BUG_ON(v.counter != r);
67
68	INIT(v0);
69	r -= -one;
70	BUG_ON(atomic64_sub_return(-one, &v) != r);
71	BUG_ON(v.counter != r);
72
73	INIT(v0);
74	atomic64_inc(&v);
75	r += one;
76	BUG_ON(v.counter != r);
77
78	INIT(v0);
79	r += one;
80	BUG_ON(atomic64_inc_return(&v) != r);
81	BUG_ON(v.counter != r);
82
83	INIT(v0);
84	atomic64_dec(&v);
85	r -= one;
86	BUG_ON(v.counter != r);
87
88	INIT(v0);
89	r -= one;
90	BUG_ON(atomic64_dec_return(&v) != r);
91	BUG_ON(v.counter != r);
92
93	INIT(v0);
94	BUG_ON(atomic64_xchg(&v, v1) != v0);
95	r = v1;
96	BUG_ON(v.counter != r);
97
98	INIT(v0);
99	BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
100	r = v1;
101	BUG_ON(v.counter != r);
102
103	INIT(v0);
104	BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
105	BUG_ON(v.counter != r);
106
107	INIT(v0);
108	BUG_ON(atomic64_add_unless(&v, one, v0));
109	BUG_ON(v.counter != r);
110
111	INIT(v0);
112	BUG_ON(!atomic64_add_unless(&v, one, v1));
113	r += one;
114	BUG_ON(v.counter != r);
115
116#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
117	defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
118	INIT(onestwos);
119	BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
120	r -= one;
121	BUG_ON(v.counter != r);
122
123	INIT(0);
124	BUG_ON(atomic64_dec_if_positive(&v) != -one);
125	BUG_ON(v.counter != r);
126
127	INIT(-one);
128	BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
129	BUG_ON(v.counter != r);
130#else
131#warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above
132#endif
133
134	INIT(onestwos);
135	BUG_ON(!atomic64_inc_not_zero(&v));
136	r += one;
137	BUG_ON(v.counter != r);
138
139	INIT(0);
140	BUG_ON(atomic64_inc_not_zero(&v));
141	BUG_ON(v.counter != r);
142
143	INIT(-one);
144	BUG_ON(!atomic64_inc_not_zero(&v));
145	r += one;
146	BUG_ON(v.counter != r);
147
148#ifdef CONFIG_X86
149	printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE\n",
150#ifdef CONFIG_X86_64
151	       "x86-64",
152#elif defined(CONFIG_X86_CMPXCHG64)
153	       "i586+",
154#else
155	       "i386+",
156#endif
157	       boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
158	       boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
159#else
160	printk(KERN_INFO "atomic64 test passed\n");
161#endif
162
163	return 0;
164}
165
166core_initcall(test_atomic64);
167