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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ARCH_S390_PERCPU__
3#define __ARCH_S390_PERCPU__
4
5#include <linux/preempt.h>
6#include <asm/cmpxchg.h>
7
8/*
9 * s390 uses its own implementation for per cpu data, the offset of
10 * the cpu local data area is cached in the cpu's lowcore memory.
11 */
12#define __my_cpu_offset S390_lowcore.percpu_offset
13
14/*
15 * For 64 bit module code, the module may be more than 4G above the
16 * per cpu area, use weak definitions to force the compiler to
17 * generate external references.
18 */
19#if defined(MODULE)
20#define ARCH_NEEDS_WEAK_PER_CPU
21#endif
22
23/*
24 * We use a compare-and-swap loop since that uses less cpu cycles than
25 * disabling and enabling interrupts like the generic variant would do.
26 */
27#define arch_this_cpu_to_op_simple(pcp, val, op) \
28({ \
29 typedef typeof(pcp) pcp_op_T__; \
30 pcp_op_T__ old__, new__, prev__; \
31 pcp_op_T__ *ptr__; \
32 preempt_disable_notrace(); \
33 ptr__ = raw_cpu_ptr(&(pcp)); \
34 prev__ = READ_ONCE(*ptr__); \
35 do { \
36 old__ = prev__; \
37 new__ = old__ op (val); \
38 prev__ = cmpxchg(ptr__, old__, new__); \
39 } while (prev__ != old__); \
40 preempt_enable_notrace(); \
41 new__; \
42})
43
44#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
45#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
46#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
47#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
48#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
49#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
50#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
51#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
52
53#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
54
55#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
56#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
57#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
58#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
59#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
60#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
61#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
62#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
63
64#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
65
66#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
67{ \
68 typedef typeof(pcp) pcp_op_T__; \
69 pcp_op_T__ val__ = (val); \
70 pcp_op_T__ old__, *ptr__; \
71 preempt_disable_notrace(); \
72 ptr__ = raw_cpu_ptr(&(pcp)); \
73 if (__builtin_constant_p(val__) && \
74 ((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
75 asm volatile( \
76 op2 " %[ptr__],%[val__]\n" \
77 : [ptr__] "+Q" (*ptr__) \
78 : [val__] "i" ((szcast)val__) \
79 : "cc"); \
80 } else { \
81 asm volatile( \
82 op1 " %[old__],%[val__],%[ptr__]\n" \
83 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
84 : [val__] "d" (val__) \
85 : "cc"); \
86 } \
87 preempt_enable_notrace(); \
88}
89
90#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
91#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
92
93#define arch_this_cpu_add_return(pcp, val, op) \
94({ \
95 typedef typeof(pcp) pcp_op_T__; \
96 pcp_op_T__ val__ = (val); \
97 pcp_op_T__ old__, *ptr__; \
98 preempt_disable_notrace(); \
99 ptr__ = raw_cpu_ptr(&(pcp)); \
100 asm volatile( \
101 op " %[old__],%[val__],%[ptr__]\n" \
102 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
103 : [val__] "d" (val__) \
104 : "cc"); \
105 preempt_enable_notrace(); \
106 old__ + val__; \
107})
108
109#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
110#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
111
112#define arch_this_cpu_to_op(pcp, val, op) \
113{ \
114 typedef typeof(pcp) pcp_op_T__; \
115 pcp_op_T__ val__ = (val); \
116 pcp_op_T__ old__, *ptr__; \
117 preempt_disable_notrace(); \
118 ptr__ = raw_cpu_ptr(&(pcp)); \
119 asm volatile( \
120 op " %[old__],%[val__],%[ptr__]\n" \
121 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
122 : [val__] "d" (val__) \
123 : "cc"); \
124 preempt_enable_notrace(); \
125}
126
127#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
128#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
129#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
130#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
131
132#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
133
134#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
135({ \
136 typedef typeof(pcp) pcp_op_T__; \
137 pcp_op_T__ ret__; \
138 pcp_op_T__ *ptr__; \
139 preempt_disable_notrace(); \
140 ptr__ = raw_cpu_ptr(&(pcp)); \
141 ret__ = cmpxchg(ptr__, oval, nval); \
142 preempt_enable_notrace(); \
143 ret__; \
144})
145
146#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
147#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
148#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
149#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
150
151#define arch_this_cpu_xchg(pcp, nval) \
152({ \
153 typeof(pcp) *ptr__; \
154 typeof(pcp) ret__; \
155 preempt_disable_notrace(); \
156 ptr__ = raw_cpu_ptr(&(pcp)); \
157 ret__ = xchg(ptr__, nval); \
158 preempt_enable_notrace(); \
159 ret__; \
160})
161
162#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
163#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
164#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
165#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
166
167#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
168({ \
169 typeof(pcp1) *p1__; \
170 typeof(pcp2) *p2__; \
171 int ret__; \
172 \
173 preempt_disable_notrace(); \
174 p1__ = raw_cpu_ptr(&(pcp1)); \
175 p2__ = raw_cpu_ptr(&(pcp2)); \
176 ret__ = __cmpxchg_double((unsigned long)p1__, (unsigned long)p2__, \
177 (unsigned long)(o1), (unsigned long)(o2), \
178 (unsigned long)(n1), (unsigned long)(n2)); \
179 preempt_enable_notrace(); \
180 ret__; \
181})
182
183#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
184
185#include <asm-generic/percpu.h>
186
187#endif /* __ARCH_S390_PERCPU__ */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ARCH_S390_PERCPU__
3#define __ARCH_S390_PERCPU__
4
5#include <linux/preempt.h>
6#include <asm/cmpxchg.h>
7
8/*
9 * s390 uses its own implementation for per cpu data, the offset of
10 * the cpu local data area is cached in the cpu's lowcore memory.
11 */
12#define __my_cpu_offset S390_lowcore.percpu_offset
13
14/*
15 * For 64 bit module code, the module may be more than 4G above the
16 * per cpu area, use weak definitions to force the compiler to
17 * generate external references.
18 */
19#if defined(MODULE)
20#define ARCH_NEEDS_WEAK_PER_CPU
21#endif
22
23/*
24 * We use a compare-and-swap loop since that uses less cpu cycles than
25 * disabling and enabling interrupts like the generic variant would do.
26 */
27#define arch_this_cpu_to_op_simple(pcp, val, op) \
28({ \
29 typedef typeof(pcp) pcp_op_T__; \
30 pcp_op_T__ old__, new__, prev__; \
31 pcp_op_T__ *ptr__; \
32 preempt_disable_notrace(); \
33 ptr__ = raw_cpu_ptr(&(pcp)); \
34 prev__ = READ_ONCE(*ptr__); \
35 do { \
36 old__ = prev__; \
37 new__ = old__ op (val); \
38 prev__ = cmpxchg(ptr__, old__, new__); \
39 } while (prev__ != old__); \
40 preempt_enable_notrace(); \
41 new__; \
42})
43
44#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
45#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
46#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
47#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
48#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
49#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
50#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
51#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
52
53#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
54
55#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
56#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
57#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
58#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
59#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
60#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
61#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
62#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
63
64#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
65
66#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
67{ \
68 typedef typeof(pcp) pcp_op_T__; \
69 pcp_op_T__ val__ = (val); \
70 pcp_op_T__ old__, *ptr__; \
71 preempt_disable_notrace(); \
72 ptr__ = raw_cpu_ptr(&(pcp)); \
73 if (__builtin_constant_p(val__) && \
74 ((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
75 asm volatile( \
76 op2 " %[ptr__],%[val__]\n" \
77 : [ptr__] "+Q" (*ptr__) \
78 : [val__] "i" ((szcast)val__) \
79 : "cc"); \
80 } else { \
81 asm volatile( \
82 op1 " %[old__],%[val__],%[ptr__]\n" \
83 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
84 : [val__] "d" (val__) \
85 : "cc"); \
86 } \
87 preempt_enable_notrace(); \
88}
89
90#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
91#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
92
93#define arch_this_cpu_add_return(pcp, val, op) \
94({ \
95 typedef typeof(pcp) pcp_op_T__; \
96 pcp_op_T__ val__ = (val); \
97 pcp_op_T__ old__, *ptr__; \
98 preempt_disable_notrace(); \
99 ptr__ = raw_cpu_ptr(&(pcp)); \
100 asm volatile( \
101 op " %[old__],%[val__],%[ptr__]\n" \
102 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
103 : [val__] "d" (val__) \
104 : "cc"); \
105 preempt_enable_notrace(); \
106 old__ + val__; \
107})
108
109#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
110#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
111
112#define arch_this_cpu_to_op(pcp, val, op) \
113{ \
114 typedef typeof(pcp) pcp_op_T__; \
115 pcp_op_T__ val__ = (val); \
116 pcp_op_T__ old__, *ptr__; \
117 preempt_disable_notrace(); \
118 ptr__ = raw_cpu_ptr(&(pcp)); \
119 asm volatile( \
120 op " %[old__],%[val__],%[ptr__]\n" \
121 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
122 : [val__] "d" (val__) \
123 : "cc"); \
124 preempt_enable_notrace(); \
125}
126
127#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
128#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
129#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
130#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
131
132#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
133
134#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
135({ \
136 typedef typeof(pcp) pcp_op_T__; \
137 pcp_op_T__ ret__; \
138 pcp_op_T__ *ptr__; \
139 preempt_disable_notrace(); \
140 ptr__ = raw_cpu_ptr(&(pcp)); \
141 ret__ = cmpxchg(ptr__, oval, nval); \
142 preempt_enable_notrace(); \
143 ret__; \
144})
145
146#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
147#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
148#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
149#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
150
151#define this_cpu_cmpxchg64(pcp, o, n) this_cpu_cmpxchg_8(pcp, o, n)
152
153#define this_cpu_cmpxchg128(pcp, oval, nval) \
154({ \
155 typedef typeof(pcp) pcp_op_T__; \
156 u128 old__, new__, ret__; \
157 pcp_op_T__ *ptr__; \
158 old__ = oval; \
159 new__ = nval; \
160 preempt_disable_notrace(); \
161 ptr__ = raw_cpu_ptr(&(pcp)); \
162 ret__ = cmpxchg128((void *)ptr__, old__, new__); \
163 preempt_enable_notrace(); \
164 ret__; \
165})
166
167#define arch_this_cpu_xchg(pcp, nval) \
168({ \
169 typeof(pcp) *ptr__; \
170 typeof(pcp) ret__; \
171 preempt_disable_notrace(); \
172 ptr__ = raw_cpu_ptr(&(pcp)); \
173 ret__ = xchg(ptr__, nval); \
174 preempt_enable_notrace(); \
175 ret__; \
176})
177
178#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
179#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
180#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
181#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
182
183#include <asm-generic/percpu.h>
184
185#endif /* __ARCH_S390_PERCPU__ */