Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PERCPU_H
3#define _ASM_X86_PERCPU_H
4
5#ifdef CONFIG_X86_64
6# define __percpu_seg gs
7# define __percpu_rel (%rip)
8#else
9# define __percpu_seg fs
10# define __percpu_rel
11#endif
12
13#ifdef __ASSEMBLY__
14
15#ifdef CONFIG_SMP
16# define __percpu %__percpu_seg:
17#else
18# define __percpu
19#endif
20
21#define PER_CPU_VAR(var) __percpu(var)__percpu_rel
22
23#ifdef CONFIG_X86_64_SMP
24# define INIT_PER_CPU_VAR(var) init_per_cpu__##var
25#else
26# define INIT_PER_CPU_VAR(var) var
27#endif
28
29#else /* !__ASSEMBLY__: */
30
31#include <linux/build_bug.h>
32#include <linux/stringify.h>
33#include <asm/asm.h>
34
35#ifdef CONFIG_SMP
36
37#ifdef CONFIG_CC_HAS_NAMED_AS
38
39#ifdef __CHECKER__
40# define __seg_gs __attribute__((address_space(__seg_gs)))
41# define __seg_fs __attribute__((address_space(__seg_fs)))
42#endif
43
44#ifdef CONFIG_X86_64
45# define __percpu_seg_override __seg_gs
46#else
47# define __percpu_seg_override __seg_fs
48#endif
49
50#define __percpu_prefix ""
51
52#else /* !CONFIG_CC_HAS_NAMED_AS: */
53
54#define __percpu_seg_override
55#define __percpu_prefix "%%"__stringify(__percpu_seg)":"
56
57#endif /* CONFIG_CC_HAS_NAMED_AS */
58
59#define __force_percpu_prefix "%%"__stringify(__percpu_seg)":"
60#define __my_cpu_offset this_cpu_read(this_cpu_off)
61
62/*
63 * Compared to the generic __my_cpu_offset version, the following
64 * saves one instruction and avoids clobbering a temp register.
65 *
66 * arch_raw_cpu_ptr should not be used in 32-bit VDSO for a 64-bit
67 * kernel, because games are played with CONFIG_X86_64 there and
68 * sizeof(this_cpu_off) becames 4.
69 */
70#ifndef BUILD_VDSO32_64
71#define arch_raw_cpu_ptr(_ptr) \
72({ \
73 unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \
74 \
75 tcp_ptr__ += (__force unsigned long)(_ptr); \
76 (typeof(*(_ptr)) __kernel __force *)tcp_ptr__; \
77})
78#else
79#define arch_raw_cpu_ptr(_ptr) ({ BUILD_BUG(); (typeof(_ptr))0; })
80#endif
81
82#define PER_CPU_VAR(var) %__percpu_seg:(var)__percpu_rel
83
84#else /* !CONFIG_SMP: */
85
86#define __percpu_seg_override
87#define __percpu_prefix ""
88#define __force_percpu_prefix ""
89
90#define PER_CPU_VAR(var) (var)__percpu_rel
91
92#endif /* CONFIG_SMP */
93
94#define __my_cpu_type(var) typeof(var) __percpu_seg_override
95#define __my_cpu_ptr(ptr) (__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr)
96#define __my_cpu_var(var) (*__my_cpu_ptr(&(var)))
97#define __percpu_arg(x) __percpu_prefix "%" #x
98#define __force_percpu_arg(x) __force_percpu_prefix "%" #x
99
100/*
101 * Initialized pointers to per-CPU variables needed for the boot
102 * processor need to use these macros to get the proper address
103 * offset from __per_cpu_load on SMP.
104 *
105 * There also must be an entry in vmlinux_64.lds.S
106 */
107#define DECLARE_INIT_PER_CPU(var) \
108 extern typeof(var) init_per_cpu_var(var)
109
110#ifdef CONFIG_X86_64_SMP
111# define init_per_cpu_var(var) init_per_cpu__##var
112#else
113# define init_per_cpu_var(var) var
114#endif
115
116/*
117 * For arch-specific code, we can use direct single-insn ops (they
118 * don't give an lvalue though).
119 */
120
121#define __pcpu_type_1 u8
122#define __pcpu_type_2 u16
123#define __pcpu_type_4 u32
124#define __pcpu_type_8 u64
125
126#define __pcpu_cast_1(val) ((u8)(((unsigned long) val) & 0xff))
127#define __pcpu_cast_2(val) ((u16)(((unsigned long) val) & 0xffff))
128#define __pcpu_cast_4(val) ((u32)(((unsigned long) val) & 0xffffffff))
129#define __pcpu_cast_8(val) ((u64)(val))
130
131#define __pcpu_op1_1(op, dst) op "b " dst
132#define __pcpu_op1_2(op, dst) op "w " dst
133#define __pcpu_op1_4(op, dst) op "l " dst
134#define __pcpu_op1_8(op, dst) op "q " dst
135
136#define __pcpu_op2_1(op, src, dst) op "b " src ", " dst
137#define __pcpu_op2_2(op, src, dst) op "w " src ", " dst
138#define __pcpu_op2_4(op, src, dst) op "l " src ", " dst
139#define __pcpu_op2_8(op, src, dst) op "q " src ", " dst
140
141#define __pcpu_reg_1(mod, x) mod "q" (x)
142#define __pcpu_reg_2(mod, x) mod "r" (x)
143#define __pcpu_reg_4(mod, x) mod "r" (x)
144#define __pcpu_reg_8(mod, x) mod "r" (x)
145
146#define __pcpu_reg_imm_1(x) "qi" (x)
147#define __pcpu_reg_imm_2(x) "ri" (x)
148#define __pcpu_reg_imm_4(x) "ri" (x)
149#define __pcpu_reg_imm_8(x) "re" (x)
150
151#ifdef CONFIG_USE_X86_SEG_SUPPORT
152
153#define __raw_cpu_read(size, qual, pcp) \
154({ \
155 *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)); \
156})
157
158#define __raw_cpu_write(size, qual, pcp, val) \
159do { \
160 *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \
161} while (0)
162
163#define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp)
164
165#else /* !CONFIG_USE_X86_SEG_SUPPORT: */
166
167#define __raw_cpu_read(size, qual, _var) \
168({ \
169 __pcpu_type_##size pfo_val__; \
170 \
171 asm qual (__pcpu_op2_##size("mov", __percpu_arg([var]), "%[val]") \
172 : [val] __pcpu_reg_##size("=", pfo_val__) \
173 : [var] "m" (__my_cpu_var(_var))); \
174 \
175 (typeof(_var))(unsigned long) pfo_val__; \
176})
177
178#define __raw_cpu_write(size, qual, _var, _val) \
179do { \
180 __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \
181 \
182 if (0) { \
183 typeof(_var) pto_tmp__; \
184 pto_tmp__ = (_val); \
185 (void)pto_tmp__; \
186 } \
187 asm qual(__pcpu_op2_##size("mov", "%[val]", __percpu_arg([var])) \
188 : [var] "=m" (__my_cpu_var(_var)) \
189 : [val] __pcpu_reg_imm_##size(pto_val__)); \
190} while (0)
191
192/*
193 * The generic per-CPU infrastrucutre is not suitable for
194 * reading const-qualified variables.
195 */
196#define __raw_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
197
198#endif /* CONFIG_USE_X86_SEG_SUPPORT */
199
200#define __raw_cpu_read_stable(size, _var) \
201({ \
202 __pcpu_type_##size pfo_val__; \
203 \
204 asm(__pcpu_op2_##size("mov", __force_percpu_arg(a[var]), "%[val]") \
205 : [val] __pcpu_reg_##size("=", pfo_val__) \
206 : [var] "i" (&(_var))); \
207 \
208 (typeof(_var))(unsigned long) pfo_val__; \
209})
210
211#define percpu_unary_op(size, qual, op, _var) \
212({ \
213 asm qual (__pcpu_op1_##size(op, __percpu_arg([var])) \
214 : [var] "+m" (__my_cpu_var(_var))); \
215})
216
217#define percpu_binary_op(size, qual, op, _var, _val) \
218do { \
219 __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \
220 \
221 if (0) { \
222 typeof(_var) pto_tmp__; \
223 pto_tmp__ = (_val); \
224 (void)pto_tmp__; \
225 } \
226 asm qual(__pcpu_op2_##size(op, "%[val]", __percpu_arg([var])) \
227 : [var] "+m" (__my_cpu_var(_var)) \
228 : [val] __pcpu_reg_imm_##size(pto_val__)); \
229} while (0)
230
231/*
232 * Generate a per-CPU add to memory instruction and optimize code
233 * if one is added or subtracted.
234 */
235#define percpu_add_op(size, qual, var, val) \
236do { \
237 const int pao_ID__ = (__builtin_constant_p(val) && \
238 ((val) == 1 || (val) == -1)) ? \
239 (int)(val) : 0; \
240 \
241 if (0) { \
242 typeof(var) pao_tmp__; \
243 pao_tmp__ = (val); \
244 (void)pao_tmp__; \
245 } \
246 if (pao_ID__ == 1) \
247 percpu_unary_op(size, qual, "inc", var); \
248 else if (pao_ID__ == -1) \
249 percpu_unary_op(size, qual, "dec", var); \
250 else \
251 percpu_binary_op(size, qual, "add", var, val); \
252} while (0)
253
254/*
255 * Add return operation
256 */
257#define percpu_add_return_op(size, qual, _var, _val) \
258({ \
259 __pcpu_type_##size paro_tmp__ = __pcpu_cast_##size(_val); \
260 \
261 asm qual (__pcpu_op2_##size("xadd", "%[tmp]", \
262 __percpu_arg([var])) \
263 : [tmp] __pcpu_reg_##size("+", paro_tmp__), \
264 [var] "+m" (__my_cpu_var(_var)) \
265 : : "memory"); \
266 (typeof(_var))(unsigned long) (paro_tmp__ + _val); \
267})
268
269/*
270 * raw_cpu_xchg() can use a load-store since
271 * it is not required to be IRQ-safe.
272 */
273#define raw_percpu_xchg_op(_var, _nval) \
274({ \
275 typeof(_var) pxo_old__ = raw_cpu_read(_var); \
276 \
277 raw_cpu_write(_var, _nval); \
278 \
279 pxo_old__; \
280})
281
282/*
283 * this_cpu_xchg() is implemented using CMPXCHG without a LOCK prefix.
284 * XCHG is expensive due to the implied LOCK prefix. The processor
285 * cannot prefetch cachelines if XCHG is used.
286 */
287#define this_percpu_xchg_op(_var, _nval) \
288({ \
289 typeof(_var) pxo_old__ = this_cpu_read(_var); \
290 \
291 do { } while (!this_cpu_try_cmpxchg(_var, &pxo_old__, _nval)); \
292 \
293 pxo_old__; \
294})
295
296/*
297 * CMPXCHG has no such implied lock semantics as a result it is much
298 * more efficient for CPU-local operations.
299 */
300#define percpu_cmpxchg_op(size, qual, _var, _oval, _nval) \
301({ \
302 __pcpu_type_##size pco_old__ = __pcpu_cast_##size(_oval); \
303 __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \
304 \
305 asm qual (__pcpu_op2_##size("cmpxchg", "%[nval]", \
306 __percpu_arg([var])) \
307 : [oval] "+a" (pco_old__), \
308 [var] "+m" (__my_cpu_var(_var)) \
309 : [nval] __pcpu_reg_##size(, pco_new__) \
310 : "memory"); \
311 \
312 (typeof(_var))(unsigned long) pco_old__; \
313})
314
315#define percpu_try_cmpxchg_op(size, qual, _var, _ovalp, _nval) \
316({ \
317 bool success; \
318 __pcpu_type_##size *pco_oval__ = (__pcpu_type_##size *)(_ovalp); \
319 __pcpu_type_##size pco_old__ = *pco_oval__; \
320 __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \
321 \
322 asm qual (__pcpu_op2_##size("cmpxchg", "%[nval]", \
323 __percpu_arg([var])) \
324 CC_SET(z) \
325 : CC_OUT(z) (success), \
326 [oval] "+a" (pco_old__), \
327 [var] "+m" (__my_cpu_var(_var)) \
328 : [nval] __pcpu_reg_##size(, pco_new__) \
329 : "memory"); \
330 if (unlikely(!success)) \
331 *pco_oval__ = pco_old__; \
332 \
333 likely(success); \
334})
335
336#if defined(CONFIG_X86_32) && !defined(CONFIG_UML)
337
338#define percpu_cmpxchg64_op(size, qual, _var, _oval, _nval) \
339({ \
340 union { \
341 u64 var; \
342 struct { \
343 u32 low, high; \
344 }; \
345 } old__, new__; \
346 \
347 old__.var = _oval; \
348 new__.var = _nval; \
349 \
350 asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \
351 "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
352 : [var] "+m" (__my_cpu_var(_var)), \
353 "+a" (old__.low), \
354 "+d" (old__.high) \
355 : "b" (new__.low), \
356 "c" (new__.high), \
357 "S" (&(_var)) \
358 : "memory"); \
359 \
360 old__.var; \
361})
362
363#define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, , pcp, oval, nval)
364#define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, volatile, pcp, oval, nval)
365
366#define percpu_try_cmpxchg64_op(size, qual, _var, _ovalp, _nval) \
367({ \
368 bool success; \
369 u64 *_oval = (u64 *)(_ovalp); \
370 union { \
371 u64 var; \
372 struct { \
373 u32 low, high; \
374 }; \
375 } old__, new__; \
376 \
377 old__.var = *_oval; \
378 new__.var = _nval; \
379 \
380 asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \
381 "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
382 CC_SET(z) \
383 : CC_OUT(z) (success), \
384 [var] "+m" (__my_cpu_var(_var)), \
385 "+a" (old__.low), \
386 "+d" (old__.high) \
387 : "b" (new__.low), \
388 "c" (new__.high), \
389 "S" (&(_var)) \
390 : "memory"); \
391 if (unlikely(!success)) \
392 *_oval = old__.var; \
393 \
394 likely(success); \
395})
396
397#define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, , pcp, ovalp, nval)
398#define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, volatile, pcp, ovalp, nval)
399
400#endif /* defined(CONFIG_X86_32) && !defined(CONFIG_UML) */
401
402#ifdef CONFIG_X86_64
403#define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval);
404#define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval);
405
406#define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval);
407#define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval);
408
409#define percpu_cmpxchg128_op(size, qual, _var, _oval, _nval) \
410({ \
411 union { \
412 u128 var; \
413 struct { \
414 u64 low, high; \
415 }; \
416 } old__, new__; \
417 \
418 old__.var = _oval; \
419 new__.var = _nval; \
420 \
421 asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \
422 "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
423 : [var] "+m" (__my_cpu_var(_var)), \
424 "+a" (old__.low), \
425 "+d" (old__.high) \
426 : "b" (new__.low), \
427 "c" (new__.high), \
428 "S" (&(_var)) \
429 : "memory"); \
430 \
431 old__.var; \
432})
433
434#define raw_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, , pcp, oval, nval)
435#define this_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, volatile, pcp, oval, nval)
436
437#define percpu_try_cmpxchg128_op(size, qual, _var, _ovalp, _nval) \
438({ \
439 bool success; \
440 u128 *_oval = (u128 *)(_ovalp); \
441 union { \
442 u128 var; \
443 struct { \
444 u64 low, high; \
445 }; \
446 } old__, new__; \
447 \
448 old__.var = *_oval; \
449 new__.var = _nval; \
450 \
451 asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \
452 "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
453 CC_SET(z) \
454 : CC_OUT(z) (success), \
455 [var] "+m" (__my_cpu_var(_var)), \
456 "+a" (old__.low), \
457 "+d" (old__.high) \
458 : "b" (new__.low), \
459 "c" (new__.high), \
460 "S" (&(_var)) \
461 : "memory"); \
462 if (unlikely(!success)) \
463 *_oval = old__.var; \
464 likely(success); \
465})
466
467#define raw_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, , pcp, ovalp, nval)
468#define this_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval)
469
470#endif /* CONFIG_X86_64 */
471
472#define raw_cpu_read_1(pcp) __raw_cpu_read(1, , pcp)
473#define raw_cpu_read_2(pcp) __raw_cpu_read(2, , pcp)
474#define raw_cpu_read_4(pcp) __raw_cpu_read(4, , pcp)
475#define raw_cpu_write_1(pcp, val) __raw_cpu_write(1, , pcp, val)
476#define raw_cpu_write_2(pcp, val) __raw_cpu_write(2, , pcp, val)
477#define raw_cpu_write_4(pcp, val) __raw_cpu_write(4, , pcp, val)
478
479#define this_cpu_read_1(pcp) __raw_cpu_read(1, volatile, pcp)
480#define this_cpu_read_2(pcp) __raw_cpu_read(2, volatile, pcp)
481#define this_cpu_read_4(pcp) __raw_cpu_read(4, volatile, pcp)
482#define this_cpu_write_1(pcp, val) __raw_cpu_write(1, volatile, pcp, val)
483#define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val)
484#define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val)
485
486#define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp)
487#define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp)
488#define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp)
489
490#define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val)
491#define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val)
492#define raw_cpu_add_4(pcp, val) percpu_add_op(4, , (pcp), val)
493#define raw_cpu_and_1(pcp, val) percpu_binary_op(1, , "and", (pcp), val)
494#define raw_cpu_and_2(pcp, val) percpu_binary_op(2, , "and", (pcp), val)
495#define raw_cpu_and_4(pcp, val) percpu_binary_op(4, , "and", (pcp), val)
496#define raw_cpu_or_1(pcp, val) percpu_binary_op(1, , "or", (pcp), val)
497#define raw_cpu_or_2(pcp, val) percpu_binary_op(2, , "or", (pcp), val)
498#define raw_cpu_or_4(pcp, val) percpu_binary_op(4, , "or", (pcp), val)
499#define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val)
500#define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val)
501#define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val)
502
503#define this_cpu_add_1(pcp, val) percpu_add_op(1, volatile, (pcp), val)
504#define this_cpu_add_2(pcp, val) percpu_add_op(2, volatile, (pcp), val)
505#define this_cpu_add_4(pcp, val) percpu_add_op(4, volatile, (pcp), val)
506#define this_cpu_and_1(pcp, val) percpu_binary_op(1, volatile, "and", (pcp), val)
507#define this_cpu_and_2(pcp, val) percpu_binary_op(2, volatile, "and", (pcp), val)
508#define this_cpu_and_4(pcp, val) percpu_binary_op(4, volatile, "and", (pcp), val)
509#define this_cpu_or_1(pcp, val) percpu_binary_op(1, volatile, "or", (pcp), val)
510#define this_cpu_or_2(pcp, val) percpu_binary_op(2, volatile, "or", (pcp), val)
511#define this_cpu_or_4(pcp, val) percpu_binary_op(4, volatile, "or", (pcp), val)
512#define this_cpu_xchg_1(pcp, nval) this_percpu_xchg_op(pcp, nval)
513#define this_cpu_xchg_2(pcp, nval) this_percpu_xchg_op(pcp, nval)
514#define this_cpu_xchg_4(pcp, nval) this_percpu_xchg_op(pcp, nval)
515
516#define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(1, , pcp, val)
517#define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(2, , pcp, val)
518#define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(4, , pcp, val)
519#define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, , pcp, oval, nval)
520#define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, , pcp, oval, nval)
521#define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, , pcp, oval, nval)
522#define raw_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, , pcp, ovalp, nval)
523#define raw_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, , pcp, ovalp, nval)
524#define raw_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, , pcp, ovalp, nval)
525
526#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(1, volatile, pcp, val)
527#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(2, volatile, pcp, val)
528#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(4, volatile, pcp, val)
529#define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, volatile, pcp, oval, nval)
530#define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, volatile, pcp, oval, nval)
531#define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, volatile, pcp, oval, nval)
532#define this_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, volatile, pcp, ovalp, nval)
533#define this_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, volatile, pcp, ovalp, nval)
534#define this_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, volatile, pcp, ovalp, nval)
535
536/*
537 * Per-CPU atomic 64-bit operations are only available under 64-bit kernels.
538 * 32-bit kernels must fall back to generic operations.
539 */
540#ifdef CONFIG_X86_64
541
542#define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp)
543#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
544
545#define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp)
546#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
547
548#define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp)
549
550#define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val)
551#define raw_cpu_and_8(pcp, val) percpu_binary_op(8, , "and", (pcp), val)
552#define raw_cpu_or_8(pcp, val) percpu_binary_op(8, , "or", (pcp), val)
553#define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(8, , pcp, val)
554#define raw_cpu_xchg_8(pcp, nval) raw_percpu_xchg_op(pcp, nval)
555#define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval)
556#define raw_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval)
557
558#define this_cpu_add_8(pcp, val) percpu_add_op(8, volatile, (pcp), val)
559#define this_cpu_and_8(pcp, val) percpu_binary_op(8, volatile, "and", (pcp), val)
560#define this_cpu_or_8(pcp, val) percpu_binary_op(8, volatile, "or", (pcp), val)
561#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(8, volatile, pcp, val)
562#define this_cpu_xchg_8(pcp, nval) this_percpu_xchg_op(pcp, nval)
563#define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval)
564#define this_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval)
565
566#define raw_cpu_read_long(pcp) raw_cpu_read_8(pcp)
567
568#else /* !CONFIG_X86_64: */
569
570/* There is no generic 64-bit read stable operation for 32-bit targets. */
571#define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
572
573#define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp)
574
575#endif /* CONFIG_X86_64 */
576
577#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
578
579/*
580 * this_cpu_read() makes the compiler load the per-CPU variable every time
581 * it is accessed while this_cpu_read_stable() allows the value to be cached.
582 * this_cpu_read_stable() is more efficient and can be used if its value
583 * is guaranteed to be valid across CPUs. The current users include
584 * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are
585 * actually per-thread variables implemented as per-CPU variables and
586 * thus stable for the duration of the respective task.
587 */
588#define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp)
589
590#define x86_this_cpu_constant_test_bit(_nr, _var) \
591({ \
592 unsigned long __percpu *addr__ = \
593 (unsigned long __percpu *)&(_var) + ((_nr) / BITS_PER_LONG); \
594 \
595 !!((1UL << ((_nr) % BITS_PER_LONG)) & raw_cpu_read(*addr__)); \
596})
597
598#define x86_this_cpu_variable_test_bit(_nr, _var) \
599({ \
600 bool oldbit; \
601 \
602 asm volatile("btl %[nr], " __percpu_arg([var]) \
603 CC_SET(c) \
604 : CC_OUT(c) (oldbit) \
605 : [var] "m" (__my_cpu_var(_var)), \
606 [nr] "rI" (_nr)); \
607 oldbit; \
608})
609
610#define x86_this_cpu_test_bit(_nr, _var) \
611 (__builtin_constant_p(_nr) \
612 ? x86_this_cpu_constant_test_bit(_nr, _var) \
613 : x86_this_cpu_variable_test_bit(_nr, _var))
614
615
616#include <asm-generic/percpu.h>
617
618/* We can use this directly for local CPU (faster). */
619DECLARE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off);
620
621#endif /* !__ASSEMBLY__ */
622
623#ifdef CONFIG_SMP
624
625/*
626 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu
627 * variables that are initialized and accessed before there are per_cpu
628 * areas allocated.
629 */
630
631#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
632 DEFINE_PER_CPU(_type, _name) = _initvalue; \
633 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
634 { [0 ... NR_CPUS-1] = _initvalue }; \
635 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
636
637#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
638 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \
639 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
640 { [0 ... NR_CPUS-1] = _initvalue }; \
641 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
642
643#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
644 EXPORT_PER_CPU_SYMBOL(_name)
645
646#define DECLARE_EARLY_PER_CPU(_type, _name) \
647 DECLARE_PER_CPU(_type, _name); \
648 extern __typeof__(_type) *_name##_early_ptr; \
649 extern __typeof__(_type) _name##_early_map[]
650
651#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
652 DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \
653 extern __typeof__(_type) *_name##_early_ptr; \
654 extern __typeof__(_type) _name##_early_map[]
655
656#define early_per_cpu_ptr(_name) (_name##_early_ptr)
657#define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
658
659#define early_per_cpu(_name, _cpu) \
660 *(early_per_cpu_ptr(_name) ? \
661 &early_per_cpu_ptr(_name)[_cpu] : \
662 &per_cpu(_name, _cpu))
663
664#else /* !CONFIG_SMP: */
665#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
666 DEFINE_PER_CPU(_type, _name) = _initvalue
667
668#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
669 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue
670
671#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
672 EXPORT_PER_CPU_SYMBOL(_name)
673
674#define DECLARE_EARLY_PER_CPU(_type, _name) \
675 DECLARE_PER_CPU(_type, _name)
676
677#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
678 DECLARE_PER_CPU_READ_MOSTLY(_type, _name)
679
680#define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
681#define early_per_cpu_ptr(_name) NULL
682/* no early_per_cpu_map() */
683
684#endif /* !CONFIG_SMP */
685
686#endif /* _ASM_X86_PERCPU_H */