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1da177e4 LT |
1 | #ifndef __LINUX_PERCPU_H |
2 | #define __LINUX_PERCPU_H | |
7ff6f082 | 3 | |
0a3021f4 | 4 | #include <linux/preempt.h> |
1da177e4 LT |
5 | #include <linux/slab.h> /* For kmalloc() */ |
6 | #include <linux/smp.h> | |
7ff6f082 | 7 | #include <linux/cpumask.h> |
6a242909 | 8 | #include <linux/pfn.h> |
7ff6f082 | 9 | |
1da177e4 LT |
10 | #include <asm/percpu.h> |
11 | ||
6a242909 | 12 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
b00742d3 | 13 | #ifdef CONFIG_MODULES |
6a242909 | 14 | #define PERCPU_MODULE_RESERVE (8 << 10) |
b00742d3 | 15 | #else |
6a242909 | 16 | #define PERCPU_MODULE_RESERVE 0 |
1da177e4 LT |
17 | #endif |
18 | ||
6a242909 | 19 | #ifndef PERCPU_ENOUGH_ROOM |
b00742d3 | 20 | #define PERCPU_ENOUGH_ROOM \ |
6a242909 TH |
21 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
22 | PERCPU_MODULE_RESERVE) | |
23 | #endif | |
b00742d3 | 24 | |
632bbfee JB |
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) (*({ \ | |
a666ecfb | 30 | extern int simple_identifier_##var(void); \ |
632bbfee JB |
31 | preempt_disable(); \ |
32 | &__get_cpu_var(var); })) | |
1da177e4 LT |
33 | #define put_cpu_var(var) preempt_enable() |
34 | ||
35 | #ifdef CONFIG_SMP | |
36 | ||
8d408b4b | 37 | /* minimum unit size, also is the maximum supported allocation size */ |
6a242909 | 38 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10) |
8d408b4b TH |
39 | |
40 | /* | |
41 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
42 | * back on the first chunk for dynamic percpu allocation if arch is |
43 | * manually allocating and mapping it for faster access (as a part of | |
44 | * large page mapping for example). | |
8d408b4b | 45 | * |
6b19b0c2 TH |
46 | * The following values give between one and two pages of free space |
47 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
48 | * both defconfig and a distro config on x86_64 and 32. More | |
49 | * intelligent way to determine this would be nice. | |
8d408b4b | 50 | */ |
6b19b0c2 TH |
51 | #if BITS_PER_LONG > 32 |
52 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
53 | #else | |
54 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
55 | #endif | |
8d408b4b | 56 | |
fbf59bc9 | 57 | extern void *pcpu_base_addr; |
fb435d52 | 58 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 59 | |
fd1e8a1f TH |
60 | struct pcpu_group_info { |
61 | int nr_units; /* aligned # of units */ | |
62 | unsigned long base_offset; /* base address offset */ | |
63 | unsigned int *cpu_map; /* unit->cpu map, empty | |
64 | * entries contain NR_CPUS */ | |
65 | }; | |
66 | ||
67 | struct pcpu_alloc_info { | |
68 | size_t static_size; | |
69 | size_t reserved_size; | |
70 | size_t dyn_size; | |
71 | size_t unit_size; | |
72 | size_t atom_size; | |
73 | size_t alloc_size; | |
74 | size_t __ai_size; /* internal, don't use */ | |
75 | int nr_groups; /* 0 if grouping unnecessary */ | |
76 | struct pcpu_group_info groups[]; | |
77 | }; | |
78 | ||
f58dc01b TH |
79 | enum pcpu_fc { |
80 | PCPU_FC_AUTO, | |
81 | PCPU_FC_EMBED, | |
82 | PCPU_FC_PAGE, | |
f58dc01b TH |
83 | |
84 | PCPU_FC_NR, | |
85 | }; | |
86 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
87 | ||
88 | extern enum pcpu_fc pcpu_chosen_fc; | |
89 | ||
3cbc8565 TH |
90 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
91 | size_t align); | |
d4b95f80 TH |
92 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
93 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 94 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 95 | |
fd1e8a1f TH |
96 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
97 | int nr_units); | |
98 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
99 | ||
100 | extern struct pcpu_alloc_info * __init pcpu_build_alloc_info( | |
101 | size_t reserved_size, ssize_t dyn_size, | |
102 | size_t atom_size, | |
033e48fb | 103 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn); |
033e48fb | 104 | |
fb435d52 TH |
105 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
106 | void *base_addr); | |
8d408b4b | 107 | |
08fc4580 | 108 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
c8826dd5 TH |
109 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size, |
110 | size_t atom_size, | |
111 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, | |
112 | pcpu_fc_alloc_fn_t alloc_fn, | |
113 | pcpu_fc_free_fn_t free_fn); | |
08fc4580 | 114 | #endif |
66c3a757 | 115 | |
08fc4580 | 116 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 117 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
118 | pcpu_fc_alloc_fn_t alloc_fn, |
119 | pcpu_fc_free_fn_t free_fn, | |
120 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
08fc4580 | 121 | #endif |
d4b95f80 | 122 | |
f2a8205c TH |
123 | /* |
124 | * Use this to get to a cpu's version of the per-cpu object | |
125 | * dynamically allocated. Non-atomic access to the current CPU's | |
126 | * version should probably be combined with get_cpu()/put_cpu(). | |
127 | */ | |
fbf59bc9 TH |
128 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
129 | ||
edcb4639 | 130 | extern void *__alloc_reserved_percpu(size_t size, size_t align); |
f2a8205c TH |
131 | extern void *__alloc_percpu(size_t size, size_t align); |
132 | extern void free_percpu(void *__pdata); | |
1da177e4 | 133 | |
e74e3962 TH |
134 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
135 | extern void __init setup_per_cpu_areas(void); | |
136 | #endif | |
137 | ||
1da177e4 LT |
138 | #else /* CONFIG_SMP */ |
139 | ||
b36128c8 | 140 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) |
7ff6f082 | 141 | |
f2a8205c | 142 | static inline void *__alloc_percpu(size_t size, size_t align) |
7ff6f082 | 143 | { |
f2a8205c TH |
144 | /* |
145 | * Can't easily make larger alignment work with kmalloc. WARN | |
146 | * on it. Larger alignment should only be used for module | |
147 | * percpu sections on SMP for which this path isn't used. | |
148 | */ | |
e3176036 | 149 | WARN_ON_ONCE(align > SMP_CACHE_BYTES); |
d2b02615 | 150 | return kzalloc(size, GFP_KERNEL); |
7ff6f082 MP |
151 | } |
152 | ||
f2a8205c | 153 | static inline void free_percpu(void *p) |
7ff6f082 | 154 | { |
f2a8205c | 155 | kfree(p); |
1da177e4 LT |
156 | } |
157 | ||
e74e3962 TH |
158 | static inline void __init setup_per_cpu_areas(void) { } |
159 | ||
a76761b6 TH |
160 | static inline void *pcpu_lpage_remapped(void *kaddr) |
161 | { | |
162 | return NULL; | |
163 | } | |
164 | ||
1da177e4 LT |
165 | #endif /* CONFIG_SMP */ |
166 | ||
313e458f RR |
167 | #define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type), \ |
168 | __alignof__(type)) | |
1da177e4 | 169 | |
066123a5 TH |
170 | /* |
171 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
172 | * | |
173 | * @var can be a percpu variable or a field of it and its size should | |
174 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
175 | * all others to void. | |
176 | * | |
177 | * These operations are guaranteed to be atomic w.r.t. preemption. | |
178 | * The generic versions use plain get/put_cpu_var(). Archs are | |
179 | * encouraged to implement single-instruction alternatives which don't | |
180 | * require preemption protection. | |
181 | */ | |
182 | #ifndef percpu_read | |
183 | # define percpu_read(var) \ | |
184 | ({ \ | |
185 | typeof(per_cpu_var(var)) __tmp_var__; \ | |
186 | __tmp_var__ = get_cpu_var(var); \ | |
187 | put_cpu_var(var); \ | |
188 | __tmp_var__; \ | |
189 | }) | |
190 | #endif | |
191 | ||
192 | #define __percpu_generic_to_op(var, val, op) \ | |
193 | do { \ | |
194 | get_cpu_var(var) op val; \ | |
195 | put_cpu_var(var); \ | |
196 | } while (0) | |
197 | ||
198 | #ifndef percpu_write | |
199 | # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) | |
200 | #endif | |
201 | ||
202 | #ifndef percpu_add | |
203 | # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) | |
204 | #endif | |
205 | ||
206 | #ifndef percpu_sub | |
207 | # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) | |
208 | #endif | |
209 | ||
210 | #ifndef percpu_and | |
211 | # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) | |
212 | #endif | |
213 | ||
214 | #ifndef percpu_or | |
215 | # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) | |
216 | #endif | |
217 | ||
218 | #ifndef percpu_xor | |
219 | # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) | |
220 | #endif | |
221 | ||
7340a0b1 CL |
222 | /* |
223 | * Branching function to split up a function into a set of functions that | |
224 | * are called for different scalar sizes of the objects handled. | |
225 | */ | |
226 | ||
227 | extern void __bad_size_call_parameter(void); | |
228 | ||
229 | #define __size_call_return(stem, variable) \ | |
230 | ({ typeof(variable) ret__; \ | |
231 | switch(sizeof(variable)) { \ | |
232 | case 1: ret__ = stem##1(variable);break; \ | |
233 | case 2: ret__ = stem##2(variable);break; \ | |
234 | case 4: ret__ = stem##4(variable);break; \ | |
235 | case 8: ret__ = stem##8(variable);break; \ | |
236 | default: \ | |
237 | __bad_size_call_parameter();break; \ | |
238 | } \ | |
239 | ret__; \ | |
240 | }) | |
241 | ||
242 | #define __size_call(stem, variable, ...) \ | |
243 | do { \ | |
244 | switch(sizeof(variable)) { \ | |
245 | case 1: stem##1(variable, __VA_ARGS__);break; \ | |
246 | case 2: stem##2(variable, __VA_ARGS__);break; \ | |
247 | case 4: stem##4(variable, __VA_ARGS__);break; \ | |
248 | case 8: stem##8(variable, __VA_ARGS__);break; \ | |
249 | default: \ | |
250 | __bad_size_call_parameter();break; \ | |
251 | } \ | |
252 | } while (0) | |
253 | ||
254 | /* | |
255 | * Optimized manipulation for memory allocated through the per cpu | |
256 | * allocator or for addresses of per cpu variables (can be determined | |
257 | * using per_cpu_var(xx). | |
258 | * | |
259 | * These operation guarantee exclusivity of access for other operations | |
260 | * on the *same* processor. The assumption is that per cpu data is only | |
261 | * accessed by a single processor instance (the current one). | |
262 | * | |
263 | * The first group is used for accesses that must be done in a | |
264 | * preemption safe way since we know that the context is not preempt | |
265 | * safe. Interrupts may occur. If the interrupt modifies the variable | |
266 | * too then RMW actions will not be reliable. | |
267 | * | |
268 | * The arch code can provide optimized functions in two ways: | |
269 | * | |
270 | * 1. Override the function completely. F.e. define this_cpu_add(). | |
271 | * The arch must then ensure that the various scalar format passed | |
272 | * are handled correctly. | |
273 | * | |
274 | * 2. Provide functions for certain scalar sizes. F.e. provide | |
275 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte | |
276 | * sized RMW actions. If arch code does not provide operations for | |
277 | * a scalar size then the fallback in the generic code will be | |
278 | * used. | |
279 | */ | |
280 | ||
281 | #define _this_cpu_generic_read(pcp) \ | |
282 | ({ typeof(pcp) ret__; \ | |
283 | preempt_disable(); \ | |
284 | ret__ = *this_cpu_ptr(&(pcp)); \ | |
285 | preempt_enable(); \ | |
286 | ret__; \ | |
287 | }) | |
288 | ||
289 | #ifndef this_cpu_read | |
290 | # ifndef this_cpu_read_1 | |
291 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) | |
292 | # endif | |
293 | # ifndef this_cpu_read_2 | |
294 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) | |
295 | # endif | |
296 | # ifndef this_cpu_read_4 | |
297 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) | |
298 | # endif | |
299 | # ifndef this_cpu_read_8 | |
300 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) | |
301 | # endif | |
302 | # define this_cpu_read(pcp) __size_call_return(this_cpu_read_, (pcp)) | |
303 | #endif | |
304 | ||
305 | #define _this_cpu_generic_to_op(pcp, val, op) \ | |
306 | do { \ | |
307 | preempt_disable(); \ | |
308 | *__this_cpu_ptr(&pcp) op val; \ | |
309 | preempt_enable(); \ | |
310 | } while (0) | |
311 | ||
312 | #ifndef this_cpu_write | |
313 | # ifndef this_cpu_write_1 | |
314 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
315 | # endif | |
316 | # ifndef this_cpu_write_2 | |
317 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
318 | # endif | |
319 | # ifndef this_cpu_write_4 | |
320 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
321 | # endif | |
322 | # ifndef this_cpu_write_8 | |
323 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
324 | # endif | |
325 | # define this_cpu_write(pcp, val) __size_call(this_cpu_write_, (pcp), (val)) | |
326 | #endif | |
327 | ||
328 | #ifndef this_cpu_add | |
329 | # ifndef this_cpu_add_1 | |
330 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
331 | # endif | |
332 | # ifndef this_cpu_add_2 | |
333 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
334 | # endif | |
335 | # ifndef this_cpu_add_4 | |
336 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
337 | # endif | |
338 | # ifndef this_cpu_add_8 | |
339 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
340 | # endif | |
341 | # define this_cpu_add(pcp, val) __size_call(this_cpu_add_, (pcp), (val)) | |
342 | #endif | |
343 | ||
344 | #ifndef this_cpu_sub | |
345 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) | |
346 | #endif | |
347 | ||
348 | #ifndef this_cpu_inc | |
349 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) | |
350 | #endif | |
351 | ||
352 | #ifndef this_cpu_dec | |
353 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) | |
354 | #endif | |
355 | ||
356 | #ifndef this_cpu_and | |
357 | # ifndef this_cpu_and_1 | |
358 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
359 | # endif | |
360 | # ifndef this_cpu_and_2 | |
361 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
362 | # endif | |
363 | # ifndef this_cpu_and_4 | |
364 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
365 | # endif | |
366 | # ifndef this_cpu_and_8 | |
367 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
368 | # endif | |
369 | # define this_cpu_and(pcp, val) __size_call(this_cpu_and_, (pcp), (val)) | |
370 | #endif | |
371 | ||
372 | #ifndef this_cpu_or | |
373 | # ifndef this_cpu_or_1 | |
374 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
375 | # endif | |
376 | # ifndef this_cpu_or_2 | |
377 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
378 | # endif | |
379 | # ifndef this_cpu_or_4 | |
380 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
381 | # endif | |
382 | # ifndef this_cpu_or_8 | |
383 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
384 | # endif | |
385 | # define this_cpu_or(pcp, val) __size_call(this_cpu_or_, (pcp), (val)) | |
386 | #endif | |
387 | ||
388 | #ifndef this_cpu_xor | |
389 | # ifndef this_cpu_xor_1 | |
390 | # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
391 | # endif | |
392 | # ifndef this_cpu_xor_2 | |
393 | # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
394 | # endif | |
395 | # ifndef this_cpu_xor_4 | |
396 | # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
397 | # endif | |
398 | # ifndef this_cpu_xor_8 | |
399 | # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
400 | # endif | |
401 | # define this_cpu_xor(pcp, val) __size_call(this_cpu_or_, (pcp), (val)) | |
402 | #endif | |
403 | ||
404 | /* | |
405 | * Generic percpu operations that do not require preemption handling. | |
406 | * Either we do not care about races or the caller has the | |
407 | * responsibility of handling preemptions issues. Arch code can still | |
408 | * override these instructions since the arch per cpu code may be more | |
409 | * efficient and may actually get race freeness for free (that is the | |
410 | * case for x86 for example). | |
411 | * | |
412 | * If there is no other protection through preempt disable and/or | |
413 | * disabling interupts then one of these RMW operations can show unexpected | |
414 | * behavior because the execution thread was rescheduled on another processor | |
415 | * or an interrupt occurred and the same percpu variable was modified from | |
416 | * the interrupt context. | |
417 | */ | |
418 | #ifndef __this_cpu_read | |
419 | # ifndef __this_cpu_read_1 | |
420 | # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) | |
421 | # endif | |
422 | # ifndef __this_cpu_read_2 | |
423 | # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) | |
424 | # endif | |
425 | # ifndef __this_cpu_read_4 | |
426 | # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) | |
427 | # endif | |
428 | # ifndef __this_cpu_read_8 | |
429 | # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) | |
430 | # endif | |
431 | # define __this_cpu_read(pcp) __size_call_return(__this_cpu_read_, (pcp)) | |
432 | #endif | |
433 | ||
434 | #define __this_cpu_generic_to_op(pcp, val, op) \ | |
435 | do { \ | |
436 | *__this_cpu_ptr(&(pcp)) op val; \ | |
437 | } while (0) | |
438 | ||
439 | #ifndef __this_cpu_write | |
440 | # ifndef __this_cpu_write_1 | |
441 | # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
442 | # endif | |
443 | # ifndef __this_cpu_write_2 | |
444 | # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
445 | # endif | |
446 | # ifndef __this_cpu_write_4 | |
447 | # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
448 | # endif | |
449 | # ifndef __this_cpu_write_8 | |
450 | # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
451 | # endif | |
452 | # define __this_cpu_write(pcp, val) __size_call(__this_cpu_write_, (pcp), (val)) | |
453 | #endif | |
454 | ||
455 | #ifndef __this_cpu_add | |
456 | # ifndef __this_cpu_add_1 | |
457 | # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
458 | # endif | |
459 | # ifndef __this_cpu_add_2 | |
460 | # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
461 | # endif | |
462 | # ifndef __this_cpu_add_4 | |
463 | # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
464 | # endif | |
465 | # ifndef __this_cpu_add_8 | |
466 | # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
467 | # endif | |
468 | # define __this_cpu_add(pcp, val) __size_call(__this_cpu_add_, (pcp), (val)) | |
469 | #endif | |
470 | ||
471 | #ifndef __this_cpu_sub | |
472 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) | |
473 | #endif | |
474 | ||
475 | #ifndef __this_cpu_inc | |
476 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) | |
477 | #endif | |
478 | ||
479 | #ifndef __this_cpu_dec | |
480 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) | |
481 | #endif | |
482 | ||
483 | #ifndef __this_cpu_and | |
484 | # ifndef __this_cpu_and_1 | |
485 | # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
486 | # endif | |
487 | # ifndef __this_cpu_and_2 | |
488 | # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
489 | # endif | |
490 | # ifndef __this_cpu_and_4 | |
491 | # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
492 | # endif | |
493 | # ifndef __this_cpu_and_8 | |
494 | # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
495 | # endif | |
496 | # define __this_cpu_and(pcp, val) __size_call(__this_cpu_and_, (pcp), (val)) | |
497 | #endif | |
498 | ||
499 | #ifndef __this_cpu_or | |
500 | # ifndef __this_cpu_or_1 | |
501 | # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
502 | # endif | |
503 | # ifndef __this_cpu_or_2 | |
504 | # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
505 | # endif | |
506 | # ifndef __this_cpu_or_4 | |
507 | # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
508 | # endif | |
509 | # ifndef __this_cpu_or_8 | |
510 | # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
511 | # endif | |
512 | # define __this_cpu_or(pcp, val) __size_call(__this_cpu_or_, (pcp), (val)) | |
513 | #endif | |
514 | ||
515 | #ifndef __this_cpu_xor | |
516 | # ifndef __this_cpu_xor_1 | |
517 | # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
518 | # endif | |
519 | # ifndef __this_cpu_xor_2 | |
520 | # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
521 | # endif | |
522 | # ifndef __this_cpu_xor_4 | |
523 | # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
524 | # endif | |
525 | # ifndef __this_cpu_xor_8 | |
526 | # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
527 | # endif | |
528 | # define __this_cpu_xor(pcp, val) __size_call(__this_cpu_xor_, (pcp), (val)) | |
529 | #endif | |
530 | ||
531 | /* | |
532 | * IRQ safe versions of the per cpu RMW operations. Note that these operations | |
533 | * are *not* safe against modification of the same variable from another | |
534 | * processors (which one gets when using regular atomic operations) | |
535 | . They are guaranteed to be atomic vs. local interrupts and | |
536 | * preemption only. | |
537 | */ | |
538 | #define irqsafe_cpu_generic_to_op(pcp, val, op) \ | |
539 | do { \ | |
540 | unsigned long flags; \ | |
541 | local_irq_save(flags); \ | |
542 | *__this_cpu_ptr(&(pcp)) op val; \ | |
543 | local_irq_restore(flags); \ | |
544 | } while (0) | |
545 | ||
546 | #ifndef irqsafe_cpu_add | |
547 | # ifndef irqsafe_cpu_add_1 | |
548 | # define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
549 | # endif | |
550 | # ifndef irqsafe_cpu_add_2 | |
551 | # define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
552 | # endif | |
553 | # ifndef irqsafe_cpu_add_4 | |
554 | # define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
555 | # endif | |
556 | # ifndef irqsafe_cpu_add_8 | |
557 | # define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
558 | # endif | |
559 | # define irqsafe_cpu_add(pcp, val) __size_call(irqsafe_cpu_add_, (pcp), (val)) | |
560 | #endif | |
561 | ||
562 | #ifndef irqsafe_cpu_sub | |
563 | # define irqsafe_cpu_sub(pcp, val) irqsafe_cpu_add((pcp), -(val)) | |
564 | #endif | |
565 | ||
566 | #ifndef irqsafe_cpu_inc | |
567 | # define irqsafe_cpu_inc(pcp) irqsafe_cpu_add((pcp), 1) | |
568 | #endif | |
569 | ||
570 | #ifndef irqsafe_cpu_dec | |
571 | # define irqsafe_cpu_dec(pcp) irqsafe_cpu_sub((pcp), 1) | |
572 | #endif | |
573 | ||
574 | #ifndef irqsafe_cpu_and | |
575 | # ifndef irqsafe_cpu_and_1 | |
576 | # define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
577 | # endif | |
578 | # ifndef irqsafe_cpu_and_2 | |
579 | # define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
580 | # endif | |
581 | # ifndef irqsafe_cpu_and_4 | |
582 | # define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
583 | # endif | |
584 | # ifndef irqsafe_cpu_and_8 | |
585 | # define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
586 | # endif | |
587 | # define irqsafe_cpu_and(pcp, val) __size_call(irqsafe_cpu_and_, (val)) | |
588 | #endif | |
589 | ||
590 | #ifndef irqsafe_cpu_or | |
591 | # ifndef irqsafe_cpu_or_1 | |
592 | # define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
593 | # endif | |
594 | # ifndef irqsafe_cpu_or_2 | |
595 | # define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
596 | # endif | |
597 | # ifndef irqsafe_cpu_or_4 | |
598 | # define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
599 | # endif | |
600 | # ifndef irqsafe_cpu_or_8 | |
601 | # define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
602 | # endif | |
603 | # define irqsafe_cpu_or(pcp, val) __size_call(irqsafe_cpu_or_, (val)) | |
604 | #endif | |
605 | ||
606 | #ifndef irqsafe_cpu_xor | |
607 | # ifndef irqsafe_cpu_xor_1 | |
608 | # define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
609 | # endif | |
610 | # ifndef irqsafe_cpu_xor_2 | |
611 | # define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
612 | # endif | |
613 | # ifndef irqsafe_cpu_xor_4 | |
614 | # define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
615 | # endif | |
616 | # ifndef irqsafe_cpu_xor_8 | |
617 | # define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
618 | # endif | |
619 | # define irqsafe_cpu_xor(pcp, val) __size_call(irqsafe_cpu_xor_, (val)) | |
620 | #endif | |
621 | ||
1da177e4 | 622 | #endif /* __LINUX_PERCPU_H */ |