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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_PERCPU_H_
3#define _ASM_GENERIC_PERCPU_H_
4
5#include <linux/compiler.h>
6#include <linux/threads.h>
7#include <linux/percpu-defs.h>
8
9#ifdef CONFIG_SMP
10
11/*
12 * per_cpu_offset() is the offset that has to be added to a
13 * percpu variable to get to the instance for a certain processor.
14 *
15 * Most arches use the __per_cpu_offset array for those offsets but
16 * some arches have their own ways of determining the offset (x86_64, s390).
17 */
18#ifndef __per_cpu_offset
19extern unsigned long __per_cpu_offset[NR_CPUS];
20
21#define per_cpu_offset(x) (__per_cpu_offset[x])
22#endif
23
24/*
25 * Determine the offset for the currently active processor.
26 * An arch may define __my_cpu_offset to provide a more effective
27 * means of obtaining the offset to the per cpu variables of the
28 * current processor.
29 */
30#ifndef __my_cpu_offset
31#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
32#endif
33#ifdef CONFIG_DEBUG_PREEMPT
34#define my_cpu_offset per_cpu_offset(smp_processor_id())
35#else
36#define my_cpu_offset __my_cpu_offset
37#endif
38
39/*
40 * Arch may define arch_raw_cpu_ptr() to provide more efficient address
41 * translations for raw_cpu_ptr().
42 */
43#ifndef arch_raw_cpu_ptr
44#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
45#endif
46
47#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
48extern void setup_per_cpu_areas(void);
49#endif
50
51#endif /* SMP */
52
53#ifndef PER_CPU_BASE_SECTION
54#ifdef CONFIG_SMP
55#define PER_CPU_BASE_SECTION ".data..percpu"
56#else
57#define PER_CPU_BASE_SECTION ".data"
58#endif
59#endif
60
61#ifndef PER_CPU_ATTRIBUTES
62#define PER_CPU_ATTRIBUTES
63#endif
64
65#define raw_cpu_generic_read(pcp) \
66({ \
67 *raw_cpu_ptr(&(pcp)); \
68})
69
70#define raw_cpu_generic_to_op(pcp, val, op) \
71do { \
72 *raw_cpu_ptr(&(pcp)) op val; \
73} while (0)
74
75#define raw_cpu_generic_add_return(pcp, val) \
76({ \
77 typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
78 \
79 *__p += val; \
80 *__p; \
81})
82
83#define raw_cpu_generic_xchg(pcp, nval) \
84({ \
85 typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
86 typeof(pcp) __ret; \
87 __ret = *__p; \
88 *__p = nval; \
89 __ret; \
90})
91
92#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
93({ \
94 typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
95 typeof(pcp) __ret; \
96 __ret = *__p; \
97 if (__ret == (oval)) \
98 *__p = nval; \
99 __ret; \
100})
101
102#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
103({ \
104 typeof(&(pcp1)) __p1 = raw_cpu_ptr(&(pcp1)); \
105 typeof(&(pcp2)) __p2 = raw_cpu_ptr(&(pcp2)); \
106 int __ret = 0; \
107 if (*__p1 == (oval1) && *__p2 == (oval2)) { \
108 *__p1 = nval1; \
109 *__p2 = nval2; \
110 __ret = 1; \
111 } \
112 (__ret); \
113})
114
115#define __this_cpu_generic_read_nopreempt(pcp) \
116({ \
117 typeof(pcp) __ret; \
118 preempt_disable_notrace(); \
119 __ret = READ_ONCE(*raw_cpu_ptr(&(pcp))); \
120 preempt_enable_notrace(); \
121 __ret; \
122})
123
124#define __this_cpu_generic_read_noirq(pcp) \
125({ \
126 typeof(pcp) __ret; \
127 unsigned long __flags; \
128 raw_local_irq_save(__flags); \
129 __ret = raw_cpu_generic_read(pcp); \
130 raw_local_irq_restore(__flags); \
131 __ret; \
132})
133
134#define this_cpu_generic_read(pcp) \
135({ \
136 typeof(pcp) __ret; \
137 if (__native_word(pcp)) \
138 __ret = __this_cpu_generic_read_nopreempt(pcp); \
139 else \
140 __ret = __this_cpu_generic_read_noirq(pcp); \
141 __ret; \
142})
143
144#define this_cpu_generic_to_op(pcp, val, op) \
145do { \
146 unsigned long __flags; \
147 raw_local_irq_save(__flags); \
148 raw_cpu_generic_to_op(pcp, val, op); \
149 raw_local_irq_restore(__flags); \
150} while (0)
151
152
153#define this_cpu_generic_add_return(pcp, val) \
154({ \
155 typeof(pcp) __ret; \
156 unsigned long __flags; \
157 raw_local_irq_save(__flags); \
158 __ret = raw_cpu_generic_add_return(pcp, val); \
159 raw_local_irq_restore(__flags); \
160 __ret; \
161})
162
163#define this_cpu_generic_xchg(pcp, nval) \
164({ \
165 typeof(pcp) __ret; \
166 unsigned long __flags; \
167 raw_local_irq_save(__flags); \
168 __ret = raw_cpu_generic_xchg(pcp, nval); \
169 raw_local_irq_restore(__flags); \
170 __ret; \
171})
172
173#define this_cpu_generic_cmpxchg(pcp, oval, nval) \
174({ \
175 typeof(pcp) __ret; \
176 unsigned long __flags; \
177 raw_local_irq_save(__flags); \
178 __ret = raw_cpu_generic_cmpxchg(pcp, oval, nval); \
179 raw_local_irq_restore(__flags); \
180 __ret; \
181})
182
183#define this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
184({ \
185 int __ret; \
186 unsigned long __flags; \
187 raw_local_irq_save(__flags); \
188 __ret = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
189 oval1, oval2, nval1, nval2); \
190 raw_local_irq_restore(__flags); \
191 __ret; \
192})
193
194#ifndef raw_cpu_read_1
195#define raw_cpu_read_1(pcp) raw_cpu_generic_read(pcp)
196#endif
197#ifndef raw_cpu_read_2
198#define raw_cpu_read_2(pcp) raw_cpu_generic_read(pcp)
199#endif
200#ifndef raw_cpu_read_4
201#define raw_cpu_read_4(pcp) raw_cpu_generic_read(pcp)
202#endif
203#ifndef raw_cpu_read_8
204#define raw_cpu_read_8(pcp) raw_cpu_generic_read(pcp)
205#endif
206
207#ifndef raw_cpu_write_1
208#define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
209#endif
210#ifndef raw_cpu_write_2
211#define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
212#endif
213#ifndef raw_cpu_write_4
214#define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
215#endif
216#ifndef raw_cpu_write_8
217#define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
218#endif
219
220#ifndef raw_cpu_add_1
221#define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
222#endif
223#ifndef raw_cpu_add_2
224#define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
225#endif
226#ifndef raw_cpu_add_4
227#define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
228#endif
229#ifndef raw_cpu_add_8
230#define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
231#endif
232
233#ifndef raw_cpu_and_1
234#define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
235#endif
236#ifndef raw_cpu_and_2
237#define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
238#endif
239#ifndef raw_cpu_and_4
240#define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
241#endif
242#ifndef raw_cpu_and_8
243#define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
244#endif
245
246#ifndef raw_cpu_or_1
247#define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
248#endif
249#ifndef raw_cpu_or_2
250#define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
251#endif
252#ifndef raw_cpu_or_4
253#define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
254#endif
255#ifndef raw_cpu_or_8
256#define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
257#endif
258
259#ifndef raw_cpu_add_return_1
260#define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
261#endif
262#ifndef raw_cpu_add_return_2
263#define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val)
264#endif
265#ifndef raw_cpu_add_return_4
266#define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val)
267#endif
268#ifndef raw_cpu_add_return_8
269#define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
270#endif
271
272#ifndef raw_cpu_xchg_1
273#define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
274#endif
275#ifndef raw_cpu_xchg_2
276#define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
277#endif
278#ifndef raw_cpu_xchg_4
279#define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
280#endif
281#ifndef raw_cpu_xchg_8
282#define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
283#endif
284
285#ifndef raw_cpu_cmpxchg_1
286#define raw_cpu_cmpxchg_1(pcp, oval, nval) \
287 raw_cpu_generic_cmpxchg(pcp, oval, nval)
288#endif
289#ifndef raw_cpu_cmpxchg_2
290#define raw_cpu_cmpxchg_2(pcp, oval, nval) \
291 raw_cpu_generic_cmpxchg(pcp, oval, nval)
292#endif
293#ifndef raw_cpu_cmpxchg_4
294#define raw_cpu_cmpxchg_4(pcp, oval, nval) \
295 raw_cpu_generic_cmpxchg(pcp, oval, nval)
296#endif
297#ifndef raw_cpu_cmpxchg_8
298#define raw_cpu_cmpxchg_8(pcp, oval, nval) \
299 raw_cpu_generic_cmpxchg(pcp, oval, nval)
300#endif
301
302#ifndef raw_cpu_cmpxchg_double_1
303#define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
304 raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
305#endif
306#ifndef raw_cpu_cmpxchg_double_2
307#define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
308 raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
309#endif
310#ifndef raw_cpu_cmpxchg_double_4
311#define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
312 raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
313#endif
314#ifndef raw_cpu_cmpxchg_double_8
315#define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
316 raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
317#endif
318
319#ifndef this_cpu_read_1
320#define this_cpu_read_1(pcp) this_cpu_generic_read(pcp)
321#endif
322#ifndef this_cpu_read_2
323#define this_cpu_read_2(pcp) this_cpu_generic_read(pcp)
324#endif
325#ifndef this_cpu_read_4
326#define this_cpu_read_4(pcp) this_cpu_generic_read(pcp)
327#endif
328#ifndef this_cpu_read_8
329#define this_cpu_read_8(pcp) this_cpu_generic_read(pcp)
330#endif
331
332#ifndef this_cpu_write_1
333#define this_cpu_write_1(pcp, val) this_cpu_generic_to_op(pcp, val, =)
334#endif
335#ifndef this_cpu_write_2
336#define this_cpu_write_2(pcp, val) this_cpu_generic_to_op(pcp, val, =)
337#endif
338#ifndef this_cpu_write_4
339#define this_cpu_write_4(pcp, val) this_cpu_generic_to_op(pcp, val, =)
340#endif
341#ifndef this_cpu_write_8
342#define this_cpu_write_8(pcp, val) this_cpu_generic_to_op(pcp, val, =)
343#endif
344
345#ifndef this_cpu_add_1
346#define this_cpu_add_1(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
347#endif
348#ifndef this_cpu_add_2
349#define this_cpu_add_2(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
350#endif
351#ifndef this_cpu_add_4
352#define this_cpu_add_4(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
353#endif
354#ifndef this_cpu_add_8
355#define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
356#endif
357
358#ifndef this_cpu_and_1
359#define this_cpu_and_1(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
360#endif
361#ifndef this_cpu_and_2
362#define this_cpu_and_2(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
363#endif
364#ifndef this_cpu_and_4
365#define this_cpu_and_4(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
366#endif
367#ifndef this_cpu_and_8
368#define this_cpu_and_8(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
369#endif
370
371#ifndef this_cpu_or_1
372#define this_cpu_or_1(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
373#endif
374#ifndef this_cpu_or_2
375#define this_cpu_or_2(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
376#endif
377#ifndef this_cpu_or_4
378#define this_cpu_or_4(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
379#endif
380#ifndef this_cpu_or_8
381#define this_cpu_or_8(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
382#endif
383
384#ifndef this_cpu_add_return_1
385#define this_cpu_add_return_1(pcp, val) this_cpu_generic_add_return(pcp, val)
386#endif
387#ifndef this_cpu_add_return_2
388#define this_cpu_add_return_2(pcp, val) this_cpu_generic_add_return(pcp, val)
389#endif
390#ifndef this_cpu_add_return_4
391#define this_cpu_add_return_4(pcp, val) this_cpu_generic_add_return(pcp, val)
392#endif
393#ifndef this_cpu_add_return_8
394#define this_cpu_add_return_8(pcp, val) this_cpu_generic_add_return(pcp, val)
395#endif
396
397#ifndef this_cpu_xchg_1
398#define this_cpu_xchg_1(pcp, nval) this_cpu_generic_xchg(pcp, nval)
399#endif
400#ifndef this_cpu_xchg_2
401#define this_cpu_xchg_2(pcp, nval) this_cpu_generic_xchg(pcp, nval)
402#endif
403#ifndef this_cpu_xchg_4
404#define this_cpu_xchg_4(pcp, nval) this_cpu_generic_xchg(pcp, nval)
405#endif
406#ifndef this_cpu_xchg_8
407#define this_cpu_xchg_8(pcp, nval) this_cpu_generic_xchg(pcp, nval)
408#endif
409
410#ifndef this_cpu_cmpxchg_1
411#define this_cpu_cmpxchg_1(pcp, oval, nval) \
412 this_cpu_generic_cmpxchg(pcp, oval, nval)
413#endif
414#ifndef this_cpu_cmpxchg_2
415#define this_cpu_cmpxchg_2(pcp, oval, nval) \
416 this_cpu_generic_cmpxchg(pcp, oval, nval)
417#endif
418#ifndef this_cpu_cmpxchg_4
419#define this_cpu_cmpxchg_4(pcp, oval, nval) \
420 this_cpu_generic_cmpxchg(pcp, oval, nval)
421#endif
422#ifndef this_cpu_cmpxchg_8
423#define this_cpu_cmpxchg_8(pcp, oval, nval) \
424 this_cpu_generic_cmpxchg(pcp, oval, nval)
425#endif
426
427#ifndef this_cpu_cmpxchg_double_1
428#define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
429 this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
430#endif
431#ifndef this_cpu_cmpxchg_double_2
432#define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
433 this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
434#endif
435#ifndef this_cpu_cmpxchg_double_4
436#define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
437 this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
438#endif
439#ifndef this_cpu_cmpxchg_double_8
440#define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
441 this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
442#endif
443
444#endif /* _ASM_GENERIC_PERCPU_H_ */
1#ifndef _ASM_GENERIC_PERCPU_H_
2#define _ASM_GENERIC_PERCPU_H_
3
4#include <linux/compiler.h>
5#include <linux/threads.h>
6#include <linux/percpu-defs.h>
7
8#ifdef CONFIG_SMP
9
10/*
11 * per_cpu_offset() is the offset that has to be added to a
12 * percpu variable to get to the instance for a certain processor.
13 *
14 * Most arches use the __per_cpu_offset array for those offsets but
15 * some arches have their own ways of determining the offset (x86_64, s390).
16 */
17#ifndef __per_cpu_offset
18extern unsigned long __per_cpu_offset[NR_CPUS];
19
20#define per_cpu_offset(x) (__per_cpu_offset[x])
21#endif
22
23/*
24 * Determine the offset for the currently active processor.
25 * An arch may define __my_cpu_offset to provide a more effective
26 * means of obtaining the offset to the per cpu variables of the
27 * current processor.
28 */
29#ifndef __my_cpu_offset
30#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
31#endif
32#ifdef CONFIG_DEBUG_PREEMPT
33#define my_cpu_offset per_cpu_offset(smp_processor_id())
34#else
35#define my_cpu_offset __my_cpu_offset
36#endif
37
38/*
39 * Add a offset to a pointer but keep the pointer as is.
40 *
41 * Only S390 provides its own means of moving the pointer.
42 */
43#ifndef SHIFT_PERCPU_PTR
44/* Weird cast keeps both GCC and sparse happy. */
45#define SHIFT_PERCPU_PTR(__p, __offset) ({ \
46 __verify_pcpu_ptr((__p)); \
47 RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
48})
49#endif
50
51/*
52 * A percpu variable may point to a discarded regions. The following are
53 * established ways to produce a usable pointer from the percpu variable
54 * offset.
55 */
56#define per_cpu(var, cpu) \
57 (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
58
59#ifndef __this_cpu_ptr
60#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
61#endif
62#ifdef CONFIG_DEBUG_PREEMPT
63#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)
64#else
65#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr)
66#endif
67
68#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
69#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var)))
70
71#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
72extern void setup_per_cpu_areas(void);
73#endif
74
75#else /* ! SMP */
76
77#define VERIFY_PERCPU_PTR(__p) ({ \
78 __verify_pcpu_ptr((__p)); \
79 (typeof(*(__p)) __kernel __force *)(__p); \
80})
81
82#define per_cpu(var, cpu) (*((void)(cpu), VERIFY_PERCPU_PTR(&(var))))
83#define __get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
84#define __raw_get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
85#define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
86#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)
87
88#endif /* SMP */
89
90#ifndef PER_CPU_BASE_SECTION
91#ifdef CONFIG_SMP
92#define PER_CPU_BASE_SECTION ".data..percpu"
93#else
94#define PER_CPU_BASE_SECTION ".data"
95#endif
96#endif
97
98#ifdef CONFIG_SMP
99
100#ifdef MODULE
101#define PER_CPU_SHARED_ALIGNED_SECTION ""
102#define PER_CPU_ALIGNED_SECTION ""
103#else
104#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
105#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
106#endif
107#define PER_CPU_FIRST_SECTION "..first"
108
109#else
110
111#define PER_CPU_SHARED_ALIGNED_SECTION ""
112#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
113#define PER_CPU_FIRST_SECTION ""
114
115#endif
116
117#ifndef PER_CPU_ATTRIBUTES
118#define PER_CPU_ATTRIBUTES
119#endif
120
121#ifndef PER_CPU_DEF_ATTRIBUTES
122#define PER_CPU_DEF_ATTRIBUTES
123#endif
124
125#endif /* _ASM_GENERIC_PERCPU_H_ */