summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/percpu.h
blob: 86fe0ee2cee5945beacca37f563d6d118fae0a12 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__

#include <linux/preempt.h>
#include <asm/cmpxchg.h>

/*
 * s390 uses its own implementation for per cpu data, the offset of
 * the cpu local data area is cached in the cpu's lowcore memory.
 */
#define __my_cpu_offset S390_lowcore.percpu_offset

/*
 * For 64 bit module code, the module may be more than 4G above the
 * per cpu area, use weak definitions to force the compiler to
 * generate external references.
 */
#if defined(CONFIG_SMP) && defined(CONFIG_64BIT) && defined(MODULE)
#define ARCH_NEEDS_WEAK_PER_CPU
#endif

#define arch_this_cpu_to_op(pcp, val, op)				\
({									\
	typedef typeof(pcp) pcp_op_T__;					\
	pcp_op_T__ old__, new__, prev__;				\
	pcp_op_T__ *ptr__;						\
	preempt_disable();						\
	ptr__ = __this_cpu_ptr(&(pcp));					\
	prev__ = *ptr__;						\
	do {								\
		old__ = prev__;						\
		new__ = old__ op (val);					\
		switch (sizeof(*ptr__)) {				\
		case 8:							\
			prev__ = cmpxchg64(ptr__, old__, new__);	\
			break;						\
		default:						\
			prev__ = cmpxchg(ptr__, old__, new__);		\
		}							\
	} while (prev__ != old__);					\
	preempt_enable();						\
	new__;								\
})

#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op(pcp, val, +)

#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op(pcp, val, +)
#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op(pcp, val, +)

#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op(pcp, val, &)
#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op(pcp, val, &)
#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, &)
#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, &)

#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op(pcp, val, |)
#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op(pcp, val, |)
#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, |)
#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, |)

#define this_cpu_xor_1(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
#define this_cpu_xor_2(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
#define this_cpu_xor_4(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
#define this_cpu_xor_8(pcp, val) arch_this_cpu_to_op(pcp, val, ^)

#define arch_this_cpu_cmpxchg(pcp, oval, nval)				\
({									\
	typedef typeof(pcp) pcp_op_T__;					\
	pcp_op_T__ ret__;						\
	pcp_op_T__ *ptr__;						\
	preempt_disable();						\
	ptr__ = __this_cpu_ptr(&(pcp));					\
	switch (sizeof(*ptr__)) {					\
	case 8:								\
		ret__ = cmpxchg64(ptr__, oval, nval);			\
		break;							\
	default:							\
		ret__ = cmpxchg(ptr__, oval, nval);			\
	}								\
	preempt_enable();						\
	ret__;								\
})

#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)

#define arch_this_cpu_xchg(pcp, nval)					\
({									\
	typeof(pcp) *ptr__;						\
	typeof(pcp) ret__;						\
	preempt_disable();						\
	ptr__ = __this_cpu_ptr(&(pcp));					\
	ret__ = xchg(ptr__, nval);					\
	preempt_enable();						\
	ret__;								\
})

#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#ifdef CONFIG_64BIT
#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#endif

#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2)	\
({									\
	typeof(pcp1) o1__ = (o1), n1__ = (n1);				\
	typeof(pcp2) o2__ = (o2), n2__ = (n2);				\
	typeof(pcp1) *p1__;						\
	typeof(pcp2) *p2__;						\
	int ret__;							\
	preempt_disable();						\
	p1__ = __this_cpu_ptr(&(pcp1));					\
	p2__ = __this_cpu_ptr(&(pcp2));					\
	ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__);	\
	preempt_enable();						\
	ret__;								\
})

#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
#ifdef CONFIG_64BIT
#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
#endif

#include <asm-generic/percpu.h>

#endif /* __ARCH_S390_PERCPU__ */