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1 | #ifndef __LINUX_PERCPU_H |
2 | #define __LINUX_PERCPU_H |
3 | |
4 | #include <linux/preempt.h> |
5 | #include <linux/smp.h> |
6 | #include <linux/cpumask.h> |
7 | #include <linux/pfn.h> |
8 | #include <linux/init.h> |
9 | |
10 | #include <asm/percpu.h> |
11 | |
12 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
13 | #ifdef CONFIG_MODULES |
14 | #define PERCPU_MODULE_RESERVE (8 << 10) |
15 | #else |
16 | #define PERCPU_MODULE_RESERVE 0 |
17 | #endif |
18 | |
19 | #ifndef PERCPU_ENOUGH_ROOM |
20 | #define PERCPU_ENOUGH_ROOM \ |
21 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
22 | PERCPU_MODULE_RESERVE) |
23 | #endif |
24 | |
25 | /* |
26 | * Must be an lvalue. Since @var must be a simple identifier, |
27 | * we force a syntax error here if it isn't. |
28 | */ |
29 | #define get_cpu_var(var) (*({ \ |
30 | preempt_disable(); \ |
31 | &__get_cpu_var(var); })) |
32 | |
33 | /* |
34 | * The weird & is necessary because sparse considers (void)(var) to be |
35 | * a direct dereference of percpu variable (var). |
36 | */ |
37 | #define put_cpu_var(var) do { \ |
38 | (void)&(var); \ |
39 | preempt_enable(); \ |
40 | } while (0) |
41 | |
42 | #define get_cpu_ptr(var) ({ \ |
43 | preempt_disable(); \ |
44 | this_cpu_ptr(var); }) |
45 | |
46 | #define put_cpu_ptr(var) do { \ |
47 | (void)(var); \ |
48 | preempt_enable(); \ |
49 | } while (0) |
50 | |
51 | /* minimum unit size, also is the maximum supported allocation size */ |
52 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
53 | |
54 | /* |
55 | * Percpu allocator can serve percpu allocations before slab is |
56 | * initialized which allows slab to depend on the percpu allocator. |
57 | * The following two parameters decide how much resource to |
58 | * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or |
59 | * larger than PERCPU_DYNAMIC_EARLY_SIZE. |
60 | */ |
61 | #define PERCPU_DYNAMIC_EARLY_SLOTS 128 |
62 | #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) |
63 | |
64 | /* |
65 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy |
66 | * back on the first chunk for dynamic percpu allocation if arch is |
67 | * manually allocating and mapping it for faster access (as a part of |
68 | * large page mapping for example). |
69 | * |
70 | * The following values give between one and two pages of free space |
71 | * after typical minimal boot (2-way SMP, single disk and NIC) with |
72 | * both defconfig and a distro config on x86_64 and 32. More |
73 | * intelligent way to determine this would be nice. |
74 | */ |
75 | #if BITS_PER_LONG > 32 |
76 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) |
77 | #else |
78 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) |
79 | #endif |
80 | |
81 | extern void *pcpu_base_addr; |
82 | extern const unsigned long *pcpu_unit_offsets; |
83 | |
84 | struct pcpu_group_info { |
85 | int nr_units; /* aligned # of units */ |
86 | unsigned long base_offset; /* base address offset */ |
87 | unsigned int *cpu_map; /* unit->cpu map, empty |
88 | * entries contain NR_CPUS */ |
89 | }; |
90 | |
91 | struct pcpu_alloc_info { |
92 | size_t static_size; |
93 | size_t reserved_size; |
94 | size_t dyn_size; |
95 | size_t unit_size; |
96 | size_t atom_size; |
97 | size_t alloc_size; |
98 | size_t __ai_size; /* internal, don't use */ |
99 | int nr_groups; /* 0 if grouping unnecessary */ |
100 | struct pcpu_group_info groups[]; |
101 | }; |
102 | |
103 | enum pcpu_fc { |
104 | PCPU_FC_AUTO, |
105 | PCPU_FC_EMBED, |
106 | PCPU_FC_PAGE, |
107 | |
108 | PCPU_FC_NR, |
109 | }; |
110 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
111 | |
112 | extern enum pcpu_fc pcpu_chosen_fc; |
113 | |
114 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
115 | size_t align); |
116 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
117 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); |
118 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
119 | |
120 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
121 | int nr_units); |
122 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); |
123 | |
124 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
125 | void *base_addr); |
126 | |
127 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
128 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
129 | size_t atom_size, |
130 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, |
131 | pcpu_fc_alloc_fn_t alloc_fn, |
132 | pcpu_fc_free_fn_t free_fn); |
133 | #endif |
134 | |
135 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
136 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
137 | pcpu_fc_alloc_fn_t alloc_fn, |
138 | pcpu_fc_free_fn_t free_fn, |
139 | pcpu_fc_populate_pte_fn_t populate_pte_fn); |
140 | #endif |
141 | |
142 | /* |
143 | * Use this to get to a cpu's version of the per-cpu object |
144 | * dynamically allocated. Non-atomic access to the current CPU's |
145 | * version should probably be combined with get_cpu()/put_cpu(). |
146 | */ |
147 | #ifdef CONFIG_SMP |
148 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
149 | #else |
150 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) |
151 | #endif |
152 | |
153 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
154 | extern bool is_kernel_percpu_address(unsigned long addr); |
155 | |
156 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
157 | extern void __init setup_per_cpu_areas(void); |
158 | #endif |
159 | extern void __init percpu_init_late(void); |
160 | |
161 | extern void __percpu *__alloc_percpu(size_t size, size_t align); |
162 | extern void free_percpu(void __percpu *__pdata); |
163 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); |
164 | |
165 | #define alloc_percpu(type) \ |
166 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
167 | |
168 | /* |
169 | * Branching function to split up a function into a set of functions that |
170 | * are called for different scalar sizes of the objects handled. |
171 | */ |
172 | |
173 | extern void __bad_size_call_parameter(void); |
174 | |
175 | #define __pcpu_size_call_return(stem, variable) \ |
176 | ({ typeof(variable) pscr_ret__; \ |
177 | __verify_pcpu_ptr(&(variable)); \ |
178 | switch(sizeof(variable)) { \ |
179 | case 1: pscr_ret__ = stem##1(variable);break; \ |
180 | case 2: pscr_ret__ = stem##2(variable);break; \ |
181 | case 4: pscr_ret__ = stem##4(variable);break; \ |
182 | case 8: pscr_ret__ = stem##8(variable);break; \ |
183 | default: \ |
184 | __bad_size_call_parameter();break; \ |
185 | } \ |
186 | pscr_ret__; \ |
187 | }) |
188 | |
189 | #define __pcpu_size_call_return2(stem, variable, ...) \ |
190 | ({ \ |
191 | typeof(variable) pscr2_ret__; \ |
192 | __verify_pcpu_ptr(&(variable)); \ |
193 | switch(sizeof(variable)) { \ |
194 | case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ |
195 | case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ |
196 | case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ |
197 | case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ |
198 | default: \ |
199 | __bad_size_call_parameter(); break; \ |
200 | } \ |
201 | pscr2_ret__; \ |
202 | }) |
203 | |
204 | /* |
205 | * Special handling for cmpxchg_double. cmpxchg_double is passed two |
206 | * percpu variables. The first has to be aligned to a double word |
207 | * boundary and the second has to follow directly thereafter. |
208 | * We enforce this on all architectures even if they don't support |
209 | * a double cmpxchg instruction, since it's a cheap requirement, and it |
210 | * avoids breaking the requirement for architectures with the instruction. |
211 | */ |
212 | #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ |
213 | ({ \ |
214 | bool pdcrb_ret__; \ |
215 | __verify_pcpu_ptr(&pcp1); \ |
216 | BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ |
217 | VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1))); \ |
218 | VM_BUG_ON((unsigned long)(&pcp2) != \ |
219 | (unsigned long)(&pcp1) + sizeof(pcp1)); \ |
220 | switch(sizeof(pcp1)) { \ |
221 | case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ |
222 | case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ |
223 | case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ |
224 | case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ |
225 | default: \ |
226 | __bad_size_call_parameter(); break; \ |
227 | } \ |
228 | pdcrb_ret__; \ |
229 | }) |
230 | |
231 | #define __pcpu_size_call(stem, variable, ...) \ |
232 | do { \ |
233 | __verify_pcpu_ptr(&(variable)); \ |
234 | switch(sizeof(variable)) { \ |
235 | case 1: stem##1(variable, __VA_ARGS__);break; \ |
236 | case 2: stem##2(variable, __VA_ARGS__);break; \ |
237 | case 4: stem##4(variable, __VA_ARGS__);break; \ |
238 | case 8: stem##8(variable, __VA_ARGS__);break; \ |
239 | default: \ |
240 | __bad_size_call_parameter();break; \ |
241 | } \ |
242 | } while (0) |
243 | |
244 | /* |
245 | * Optimized manipulation for memory allocated through the per cpu |
246 | * allocator or for addresses of per cpu variables. |
247 | * |
248 | * These operation guarantee exclusivity of access for other operations |
249 | * on the *same* processor. The assumption is that per cpu data is only |
250 | * accessed by a single processor instance (the current one). |
251 | * |
252 | * The first group is used for accesses that must be done in a |
253 | * preemption safe way since we know that the context is not preempt |
254 | * safe. Interrupts may occur. If the interrupt modifies the variable |
255 | * too then RMW actions will not be reliable. |
256 | * |
257 | * The arch code can provide optimized functions in two ways: |
258 | * |
259 | * 1. Override the function completely. F.e. define this_cpu_add(). |
260 | * The arch must then ensure that the various scalar format passed |
261 | * are handled correctly. |
262 | * |
263 | * 2. Provide functions for certain scalar sizes. F.e. provide |
264 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte |
265 | * sized RMW actions. If arch code does not provide operations for |
266 | * a scalar size then the fallback in the generic code will be |
267 | * used. |
268 | */ |
269 | |
270 | #define _this_cpu_generic_read(pcp) \ |
271 | ({ typeof(pcp) ret__; \ |
272 | preempt_disable(); \ |
273 | ret__ = *this_cpu_ptr(&(pcp)); \ |
274 | preempt_enable(); \ |
275 | ret__; \ |
276 | }) |
277 | |
278 | #ifndef this_cpu_read |
279 | # ifndef this_cpu_read_1 |
280 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) |
281 | # endif |
282 | # ifndef this_cpu_read_2 |
283 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) |
284 | # endif |
285 | # ifndef this_cpu_read_4 |
286 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) |
287 | # endif |
288 | # ifndef this_cpu_read_8 |
289 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) |
290 | # endif |
291 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
292 | #endif |
293 | |
294 | #define _this_cpu_generic_to_op(pcp, val, op) \ |
295 | do { \ |
296 | unsigned long flags; \ |
297 | raw_local_irq_save(flags); \ |
298 | *__this_cpu_ptr(&(pcp)) op val; \ |
299 | raw_local_irq_restore(flags); \ |
300 | } while (0) |
301 | |
302 | #ifndef this_cpu_write |
303 | # ifndef this_cpu_write_1 |
304 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
305 | # endif |
306 | # ifndef this_cpu_write_2 |
307 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
308 | # endif |
309 | # ifndef this_cpu_write_4 |
310 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
311 | # endif |
312 | # ifndef this_cpu_write_8 |
313 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
314 | # endif |
315 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
316 | #endif |
317 | |
318 | #ifndef this_cpu_add |
319 | # ifndef this_cpu_add_1 |
320 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
321 | # endif |
322 | # ifndef this_cpu_add_2 |
323 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
324 | # endif |
325 | # ifndef this_cpu_add_4 |
326 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
327 | # endif |
328 | # ifndef this_cpu_add_8 |
329 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
330 | # endif |
331 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
332 | #endif |
333 | |
334 | #ifndef this_cpu_sub |
335 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) |
336 | #endif |
337 | |
338 | #ifndef this_cpu_inc |
339 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) |
340 | #endif |
341 | |
342 | #ifndef this_cpu_dec |
343 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) |
344 | #endif |
345 | |
346 | #ifndef this_cpu_and |
347 | # ifndef this_cpu_and_1 |
348 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
349 | # endif |
350 | # ifndef this_cpu_and_2 |
351 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
352 | # endif |
353 | # ifndef this_cpu_and_4 |
354 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
355 | # endif |
356 | # ifndef this_cpu_and_8 |
357 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
358 | # endif |
359 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
360 | #endif |
361 | |
362 | #ifndef this_cpu_or |
363 | # ifndef this_cpu_or_1 |
364 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
365 | # endif |
366 | # ifndef this_cpu_or_2 |
367 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
368 | # endif |
369 | # ifndef this_cpu_or_4 |
370 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
371 | # endif |
372 | # ifndef this_cpu_or_8 |
373 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
374 | # endif |
375 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
376 | #endif |
377 | |
378 | #ifndef this_cpu_xor |
379 | # ifndef this_cpu_xor_1 |
380 | # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) |
381 | # endif |
382 | # ifndef this_cpu_xor_2 |
383 | # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) |
384 | # endif |
385 | # ifndef this_cpu_xor_4 |
386 | # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) |
387 | # endif |
388 | # ifndef this_cpu_xor_8 |
389 | # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) |
390 | # endif |
391 | # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
392 | #endif |
393 | |
394 | #define _this_cpu_generic_add_return(pcp, val) \ |
395 | ({ \ |
396 | typeof(pcp) ret__; \ |
397 | unsigned long flags; \ |
398 | raw_local_irq_save(flags); \ |
399 | __this_cpu_add(pcp, val); \ |
400 | ret__ = __this_cpu_read(pcp); \ |
401 | raw_local_irq_restore(flags); \ |
402 | ret__; \ |
403 | }) |
404 | |
405 | #ifndef this_cpu_add_return |
406 | # ifndef this_cpu_add_return_1 |
407 | # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) |
408 | # endif |
409 | # ifndef this_cpu_add_return_2 |
410 | # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) |
411 | # endif |
412 | # ifndef this_cpu_add_return_4 |
413 | # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) |
414 | # endif |
415 | # ifndef this_cpu_add_return_8 |
416 | # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) |
417 | # endif |
418 | # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) |
419 | #endif |
420 | |
421 | #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) |
422 | #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) |
423 | #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) |
424 | |
425 | #define _this_cpu_generic_xchg(pcp, nval) \ |
426 | ({ typeof(pcp) ret__; \ |
427 | unsigned long flags; \ |
428 | raw_local_irq_save(flags); \ |
429 | ret__ = __this_cpu_read(pcp); \ |
430 | __this_cpu_write(pcp, nval); \ |
431 | raw_local_irq_restore(flags); \ |
432 | ret__; \ |
433 | }) |
434 | |
435 | #ifndef this_cpu_xchg |
436 | # ifndef this_cpu_xchg_1 |
437 | # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
438 | # endif |
439 | # ifndef this_cpu_xchg_2 |
440 | # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
441 | # endif |
442 | # ifndef this_cpu_xchg_4 |
443 | # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
444 | # endif |
445 | # ifndef this_cpu_xchg_8 |
446 | # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
447 | # endif |
448 | # define this_cpu_xchg(pcp, nval) \ |
449 | __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) |
450 | #endif |
451 | |
452 | #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ |
453 | ({ \ |
454 | typeof(pcp) ret__; \ |
455 | unsigned long flags; \ |
456 | raw_local_irq_save(flags); \ |
457 | ret__ = __this_cpu_read(pcp); \ |
458 | if (ret__ == (oval)) \ |
459 | __this_cpu_write(pcp, nval); \ |
460 | raw_local_irq_restore(flags); \ |
461 | ret__; \ |
462 | }) |
463 | |
464 | #ifndef this_cpu_cmpxchg |
465 | # ifndef this_cpu_cmpxchg_1 |
466 | # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
467 | # endif |
468 | # ifndef this_cpu_cmpxchg_2 |
469 | # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
470 | # endif |
471 | # ifndef this_cpu_cmpxchg_4 |
472 | # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
473 | # endif |
474 | # ifndef this_cpu_cmpxchg_8 |
475 | # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
476 | # endif |
477 | # define this_cpu_cmpxchg(pcp, oval, nval) \ |
478 | __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) |
479 | #endif |
480 | |
481 | /* |
482 | * cmpxchg_double replaces two adjacent scalars at once. The first |
483 | * two parameters are per cpu variables which have to be of the same |
484 | * size. A truth value is returned to indicate success or failure |
485 | * (since a double register result is difficult to handle). There is |
486 | * very limited hardware support for these operations, so only certain |
487 | * sizes may work. |
488 | */ |
489 | #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
490 | ({ \ |
491 | int ret__; \ |
492 | unsigned long flags; \ |
493 | raw_local_irq_save(flags); \ |
494 | ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ |
495 | oval1, oval2, nval1, nval2); \ |
496 | raw_local_irq_restore(flags); \ |
497 | ret__; \ |
498 | }) |
499 | |
500 | #ifndef this_cpu_cmpxchg_double |
501 | # ifndef this_cpu_cmpxchg_double_1 |
502 | # define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
503 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
504 | # endif |
505 | # ifndef this_cpu_cmpxchg_double_2 |
506 | # define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
507 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
508 | # endif |
509 | # ifndef this_cpu_cmpxchg_double_4 |
510 | # define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
511 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
512 | # endif |
513 | # ifndef this_cpu_cmpxchg_double_8 |
514 | # define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
515 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
516 | # endif |
517 | # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
518 | __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) |
519 | #endif |
520 | |
521 | /* |
522 | * Generic percpu operations for context that are safe from preemption/interrupts. |
523 | * Either we do not care about races or the caller has the |
524 | * responsibility of handling preemption/interrupt issues. Arch code can still |
525 | * override these instructions since the arch per cpu code may be more |
526 | * efficient and may actually get race freeness for free (that is the |
527 | * case for x86 for example). |
528 | * |
529 | * If there is no other protection through preempt disable and/or |
530 | * disabling interupts then one of these RMW operations can show unexpected |
531 | * behavior because the execution thread was rescheduled on another processor |
532 | * or an interrupt occurred and the same percpu variable was modified from |
533 | * the interrupt context. |
534 | */ |
535 | #ifndef __this_cpu_read |
536 | # ifndef __this_cpu_read_1 |
537 | # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) |
538 | # endif |
539 | # ifndef __this_cpu_read_2 |
540 | # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) |
541 | # endif |
542 | # ifndef __this_cpu_read_4 |
543 | # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) |
544 | # endif |
545 | # ifndef __this_cpu_read_8 |
546 | # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) |
547 | # endif |
548 | # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) |
549 | #endif |
550 | |
551 | #define __this_cpu_generic_to_op(pcp, val, op) \ |
552 | do { \ |
553 | *__this_cpu_ptr(&(pcp)) op val; \ |
554 | } while (0) |
555 | |
556 | #ifndef __this_cpu_write |
557 | # ifndef __this_cpu_write_1 |
558 | # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) |
559 | # endif |
560 | # ifndef __this_cpu_write_2 |
561 | # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) |
562 | # endif |
563 | # ifndef __this_cpu_write_4 |
564 | # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) |
565 | # endif |
566 | # ifndef __this_cpu_write_8 |
567 | # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) |
568 | # endif |
569 | # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) |
570 | #endif |
571 | |
572 | #ifndef __this_cpu_add |
573 | # ifndef __this_cpu_add_1 |
574 | # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) |
575 | # endif |
576 | # ifndef __this_cpu_add_2 |
577 | # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) |
578 | # endif |
579 | # ifndef __this_cpu_add_4 |
580 | # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) |
581 | # endif |
582 | # ifndef __this_cpu_add_8 |
583 | # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) |
584 | # endif |
585 | # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) |
586 | #endif |
587 | |
588 | #ifndef __this_cpu_sub |
589 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) |
590 | #endif |
591 | |
592 | #ifndef __this_cpu_inc |
593 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) |
594 | #endif |
595 | |
596 | #ifndef __this_cpu_dec |
597 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) |
598 | #endif |
599 | |
600 | #ifndef __this_cpu_and |
601 | # ifndef __this_cpu_and_1 |
602 | # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) |
603 | # endif |
604 | # ifndef __this_cpu_and_2 |
605 | # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) |
606 | # endif |
607 | # ifndef __this_cpu_and_4 |
608 | # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) |
609 | # endif |
610 | # ifndef __this_cpu_and_8 |
611 | # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) |
612 | # endif |
613 | # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) |
614 | #endif |
615 | |
616 | #ifndef __this_cpu_or |
617 | # ifndef __this_cpu_or_1 |
618 | # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) |
619 | # endif |
620 | # ifndef __this_cpu_or_2 |
621 | # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) |
622 | # endif |
623 | # ifndef __this_cpu_or_4 |
624 | # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) |
625 | # endif |
626 | # ifndef __this_cpu_or_8 |
627 | # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) |
628 | # endif |
629 | # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) |
630 | #endif |
631 | |
632 | #ifndef __this_cpu_xor |
633 | # ifndef __this_cpu_xor_1 |
634 | # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) |
635 | # endif |
636 | # ifndef __this_cpu_xor_2 |
637 | # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) |
638 | # endif |
639 | # ifndef __this_cpu_xor_4 |
640 | # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) |
641 | # endif |
642 | # ifndef __this_cpu_xor_8 |
643 | # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) |
644 | # endif |
645 | # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) |
646 | #endif |
647 | |
648 | #define __this_cpu_generic_add_return(pcp, val) \ |
649 | ({ \ |
650 | __this_cpu_add(pcp, val); \ |
651 | __this_cpu_read(pcp); \ |
652 | }) |
653 | |
654 | #ifndef __this_cpu_add_return |
655 | # ifndef __this_cpu_add_return_1 |
656 | # define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) |
657 | # endif |
658 | # ifndef __this_cpu_add_return_2 |
659 | # define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) |
660 | # endif |
661 | # ifndef __this_cpu_add_return_4 |
662 | # define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) |
663 | # endif |
664 | # ifndef __this_cpu_add_return_8 |
665 | # define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) |
666 | # endif |
667 | # define __this_cpu_add_return(pcp, val) \ |
668 | __pcpu_size_call_return2(__this_cpu_add_return_, pcp, val) |
669 | #endif |
670 | |
671 | #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(val)) |
672 | #define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1) |
673 | #define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1) |
674 | |
675 | #define __this_cpu_generic_xchg(pcp, nval) \ |
676 | ({ typeof(pcp) ret__; \ |
677 | ret__ = __this_cpu_read(pcp); \ |
678 | __this_cpu_write(pcp, nval); \ |
679 | ret__; \ |
680 | }) |
681 | |
682 | #ifndef __this_cpu_xchg |
683 | # ifndef __this_cpu_xchg_1 |
684 | # define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) |
685 | # endif |
686 | # ifndef __this_cpu_xchg_2 |
687 | # define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) |
688 | # endif |
689 | # ifndef __this_cpu_xchg_4 |
690 | # define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) |
691 | # endif |
692 | # ifndef __this_cpu_xchg_8 |
693 | # define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) |
694 | # endif |
695 | # define __this_cpu_xchg(pcp, nval) \ |
696 | __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) |
697 | #endif |
698 | |
699 | #define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ |
700 | ({ \ |
701 | typeof(pcp) ret__; \ |
702 | ret__ = __this_cpu_read(pcp); \ |
703 | if (ret__ == (oval)) \ |
704 | __this_cpu_write(pcp, nval); \ |
705 | ret__; \ |
706 | }) |
707 | |
708 | #ifndef __this_cpu_cmpxchg |
709 | # ifndef __this_cpu_cmpxchg_1 |
710 | # define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) |
711 | # endif |
712 | # ifndef __this_cpu_cmpxchg_2 |
713 | # define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) |
714 | # endif |
715 | # ifndef __this_cpu_cmpxchg_4 |
716 | # define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) |
717 | # endif |
718 | # ifndef __this_cpu_cmpxchg_8 |
719 | # define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) |
720 | # endif |
721 | # define __this_cpu_cmpxchg(pcp, oval, nval) \ |
722 | __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) |
723 | #endif |
724 | |
725 | #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
726 | ({ \ |
727 | int __ret = 0; \ |
728 | if (__this_cpu_read(pcp1) == (oval1) && \ |
729 | __this_cpu_read(pcp2) == (oval2)) { \ |
730 | __this_cpu_write(pcp1, (nval1)); \ |
731 | __this_cpu_write(pcp2, (nval2)); \ |
732 | __ret = 1; \ |
733 | } \ |
734 | (__ret); \ |
735 | }) |
736 | |
737 | #ifndef __this_cpu_cmpxchg_double |
738 | # ifndef __this_cpu_cmpxchg_double_1 |
739 | # define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
740 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
741 | # endif |
742 | # ifndef __this_cpu_cmpxchg_double_2 |
743 | # define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
744 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
745 | # endif |
746 | # ifndef __this_cpu_cmpxchg_double_4 |
747 | # define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
748 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
749 | # endif |
750 | # ifndef __this_cpu_cmpxchg_double_8 |
751 | # define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
752 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
753 | # endif |
754 | # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
755 | __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) |
756 | #endif |
757 | |
758 | #endif /* __LINUX_PERCPU_H */ |
759 |
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