Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __ARCH_S390_PERCPU__
2#define __ARCH_S390_PERCPU__
3
4#include <linux/preempt.h>
5#include <asm/cmpxchg.h>
6
7/*
8 * s390 uses its own implementation for per cpu data, the offset of
9 * the cpu local data area is cached in the cpu's lowcore memory.
10 */
11#define __my_cpu_offset S390_lowcore.percpu_offset
12
13#ifdef CONFIG_64BIT
14
15/*
16 * For 64 bit module code, the module may be more than 4G above the
17 * per cpu area, use weak definitions to force the compiler to
18 * generate external references.
19 */
20#if defined(CONFIG_SMP) && defined(MODULE)
21#define ARCH_NEEDS_WEAK_PER_CPU
22#endif
23
24/*
25 * We use a compare-and-swap loop since that uses less cpu cycles than
26 * disabling and enabling interrupts like the generic variant would do.
27 */
28#define arch_this_cpu_to_op_simple(pcp, val, op) \
29({ \
30 typedef typeof(pcp) pcp_op_T__; \
31 pcp_op_T__ old__, new__, prev__; \
32 pcp_op_T__ *ptr__; \
33 preempt_disable(); \
34 ptr__ = raw_cpu_ptr(&(pcp)); \
35 prev__ = *ptr__; \
36 do { \
37 old__ = prev__; \
38 new__ = old__ op (val); \
39 prev__ = cmpxchg(ptr__, old__, new__); \
40 } while (prev__ != old__); \
41 preempt_enable(); \
42 new__; \
43})
44
45#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
46#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
47#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
48#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
49#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
50#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
51#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
52#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
53
54#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
55
56#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
57#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
58#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
59#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
60#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
61#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
62#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
63#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
64
65#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
66
67#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
68{ \
69 typedef typeof(pcp) pcp_op_T__; \
70 pcp_op_T__ val__ = (val); \
71 pcp_op_T__ old__, *ptr__; \
72 preempt_disable(); \
73 ptr__ = raw_cpu_ptr(&(pcp)); \
74 if (__builtin_constant_p(val__) && \
75 ((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
76 asm volatile( \
77 op2 " %[ptr__],%[val__]\n" \
78 : [ptr__] "+Q" (*ptr__) \
79 : [val__] "i" ((szcast)val__) \
80 : "cc"); \
81 } else { \
82 asm volatile( \
83 op1 " %[old__],%[val__],%[ptr__]\n" \
84 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
85 : [val__] "d" (val__) \
86 : "cc"); \
87 } \
88 preempt_enable(); \
89}
90
91#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
92#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
93
94#define arch_this_cpu_add_return(pcp, val, op) \
95({ \
96 typedef typeof(pcp) pcp_op_T__; \
97 pcp_op_T__ val__ = (val); \
98 pcp_op_T__ old__, *ptr__; \
99 preempt_disable(); \
100 ptr__ = raw_cpu_ptr(&(pcp)); \
101 asm volatile( \
102 op " %[old__],%[val__],%[ptr__]\n" \
103 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
104 : [val__] "d" (val__) \
105 : "cc"); \
106 preempt_enable(); \
107 old__ + val__; \
108})
109
110#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
111#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
112
113#define arch_this_cpu_to_op(pcp, val, op) \
114{ \
115 typedef typeof(pcp) pcp_op_T__; \
116 pcp_op_T__ val__ = (val); \
117 pcp_op_T__ old__, *ptr__; \
118 preempt_disable(); \
119 ptr__ = raw_cpu_ptr(&(pcp)); \
120 asm volatile( \
121 op " %[old__],%[val__],%[ptr__]\n" \
122 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
123 : [val__] "d" (val__) \
124 : "cc"); \
125 preempt_enable(); \
126}
127
128#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
129#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
130#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
131#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
132
133#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
134
135#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
136({ \
137 typedef typeof(pcp) pcp_op_T__; \
138 pcp_op_T__ ret__; \
139 pcp_op_T__ *ptr__; \
140 preempt_disable(); \
141 ptr__ = raw_cpu_ptr(&(pcp)); \
142 ret__ = cmpxchg(ptr__, oval, nval); \
143 preempt_enable(); \
144 ret__; \
145})
146
147#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
148#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
149#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
150#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
151
152#define arch_this_cpu_xchg(pcp, nval) \
153({ \
154 typeof(pcp) *ptr__; \
155 typeof(pcp) ret__; \
156 preempt_disable(); \
157 ptr__ = raw_cpu_ptr(&(pcp)); \
158 ret__ = xchg(ptr__, nval); \
159 preempt_enable(); \
160 ret__; \
161})
162
163#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
164#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
165#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
166#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
167
168#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
169({ \
170 typeof(pcp1) o1__ = (o1), n1__ = (n1); \
171 typeof(pcp2) o2__ = (o2), n2__ = (n2); \
172 typeof(pcp1) *p1__; \
173 typeof(pcp2) *p2__; \
174 int ret__; \
175 preempt_disable(); \
176 p1__ = raw_cpu_ptr(&(pcp1)); \
177 p2__ = raw_cpu_ptr(&(pcp2)); \
178 ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
179 preempt_enable(); \
180 ret__; \
181})
182
183#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
184#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
185
186#endif /* CONFIG_64BIT */
187
188#include <asm-generic/percpu.h>
189
190#endif /* __ARCH_S390_PERCPU__ */