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 get_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__ */
186
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