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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) (*({ \ | |
632bbfee JB |
30 | preempt_disable(); \ |
31 | &__get_cpu_var(var); })) | |
f7b64fe8 | 32 | |
e0fdb0e0 RR |
33 | /* |
34 | * The weird & is necessary because sparse considers (void)(var) to be | |
35 | * a direct dereference of percpu variable (var). | |
36 | */ | |
f7b64fe8 | 37 | #define put_cpu_var(var) do { \ |
e0fdb0e0 | 38 | (void)&(var); \ |
f7b64fe8 TH |
39 | preempt_enable(); \ |
40 | } while (0) | |
1da177e4 LT |
41 | |
42 | #ifdef CONFIG_SMP | |
43 | ||
8d408b4b | 44 | /* minimum unit size, also is the maximum supported allocation size */ |
6a242909 | 45 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10) |
8d408b4b TH |
46 | |
47 | /* | |
48 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
49 | * back on the first chunk for dynamic percpu allocation if arch is |
50 | * manually allocating and mapping it for faster access (as a part of | |
51 | * large page mapping for example). | |
8d408b4b | 52 | * |
6b19b0c2 TH |
53 | * The following values give between one and two pages of free space |
54 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
55 | * both defconfig and a distro config on x86_64 and 32. More | |
56 | * intelligent way to determine this would be nice. | |
8d408b4b | 57 | */ |
6b19b0c2 TH |
58 | #if BITS_PER_LONG > 32 |
59 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
60 | #else | |
61 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
62 | #endif | |
8d408b4b | 63 | |
fbf59bc9 | 64 | extern void *pcpu_base_addr; |
fb435d52 | 65 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 66 | |
fd1e8a1f TH |
67 | struct pcpu_group_info { |
68 | int nr_units; /* aligned # of units */ | |
69 | unsigned long base_offset; /* base address offset */ | |
70 | unsigned int *cpu_map; /* unit->cpu map, empty | |
71 | * entries contain NR_CPUS */ | |
72 | }; | |
73 | ||
74 | struct pcpu_alloc_info { | |
75 | size_t static_size; | |
76 | size_t reserved_size; | |
77 | size_t dyn_size; | |
78 | size_t unit_size; | |
79 | size_t atom_size; | |
80 | size_t alloc_size; | |
81 | size_t __ai_size; /* internal, don't use */ | |
82 | int nr_groups; /* 0 if grouping unnecessary */ | |
83 | struct pcpu_group_info groups[]; | |
84 | }; | |
85 | ||
f58dc01b TH |
86 | enum pcpu_fc { |
87 | PCPU_FC_AUTO, | |
88 | PCPU_FC_EMBED, | |
89 | PCPU_FC_PAGE, | |
f58dc01b TH |
90 | |
91 | PCPU_FC_NR, | |
92 | }; | |
93 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
94 | ||
95 | extern enum pcpu_fc pcpu_chosen_fc; | |
96 | ||
3cbc8565 TH |
97 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
98 | size_t align); | |
d4b95f80 TH |
99 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
100 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 101 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 102 | |
fd1e8a1f TH |
103 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
104 | int nr_units); | |
105 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
106 | ||
107 | extern struct pcpu_alloc_info * __init pcpu_build_alloc_info( | |
108 | size_t reserved_size, ssize_t dyn_size, | |
109 | size_t atom_size, | |
033e48fb | 110 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn); |
033e48fb | 111 | |
fb435d52 TH |
112 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
113 | void *base_addr); | |
8d408b4b | 114 | |
08fc4580 | 115 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
c8826dd5 TH |
116 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size, |
117 | size_t atom_size, | |
118 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, | |
119 | pcpu_fc_alloc_fn_t alloc_fn, | |
120 | pcpu_fc_free_fn_t free_fn); | |
08fc4580 | 121 | #endif |
66c3a757 | 122 | |
08fc4580 | 123 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 124 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
125 | pcpu_fc_alloc_fn_t alloc_fn, |
126 | pcpu_fc_free_fn_t free_fn, | |
127 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
08fc4580 | 128 | #endif |
d4b95f80 | 129 | |
f2a8205c TH |
130 | /* |
131 | * Use this to get to a cpu's version of the per-cpu object | |
132 | * dynamically allocated. Non-atomic access to the current CPU's | |
133 | * version should probably be combined with get_cpu()/put_cpu(). | |
134 | */ | |
fbf59bc9 TH |
135 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
136 | ||
e0fdb0e0 RR |
137 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
138 | extern void __percpu *__alloc_percpu(size_t size, size_t align); | |
139 | extern void free_percpu(void __percpu *__pdata); | |
1da177e4 | 140 | |
e74e3962 TH |
141 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
142 | extern void __init setup_per_cpu_areas(void); | |
143 | #endif | |
144 | ||
1da177e4 LT |
145 | #else /* CONFIG_SMP */ |
146 | ||
b36128c8 | 147 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) |
7ff6f082 | 148 | |
e0fdb0e0 | 149 | static inline void __percpu *__alloc_percpu(size_t size, size_t align) |
7ff6f082 | 150 | { |
f2a8205c TH |
151 | /* |
152 | * Can't easily make larger alignment work with kmalloc. WARN | |
153 | * on it. Larger alignment should only be used for module | |
154 | * percpu sections on SMP for which this path isn't used. | |
155 | */ | |
e3176036 | 156 | WARN_ON_ONCE(align > SMP_CACHE_BYTES); |
d2b02615 | 157 | return kzalloc(size, GFP_KERNEL); |
7ff6f082 MP |
158 | } |
159 | ||
e0fdb0e0 | 160 | static inline void free_percpu(void __percpu *p) |
7ff6f082 | 161 | { |
f2a8205c | 162 | kfree(p); |
1da177e4 LT |
163 | } |
164 | ||
e74e3962 TH |
165 | static inline void __init setup_per_cpu_areas(void) { } |
166 | ||
a76761b6 TH |
167 | static inline void *pcpu_lpage_remapped(void *kaddr) |
168 | { | |
169 | return NULL; | |
170 | } | |
171 | ||
1da177e4 LT |
172 | #endif /* CONFIG_SMP */ |
173 | ||
64ef291f | 174 | #define alloc_percpu(type) \ |
e0fdb0e0 | 175 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
1da177e4 | 176 | |
066123a5 TH |
177 | /* |
178 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
179 | * | |
180 | * @var can be a percpu variable or a field of it and its size should | |
181 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
182 | * all others to void. | |
183 | * | |
184 | * These operations are guaranteed to be atomic w.r.t. preemption. | |
185 | * The generic versions use plain get/put_cpu_var(). Archs are | |
186 | * encouraged to implement single-instruction alternatives which don't | |
187 | * require preemption protection. | |
188 | */ | |
189 | #ifndef percpu_read | |
190 | # define percpu_read(var) \ | |
191 | ({ \ | |
f7b64fe8 TH |
192 | typeof(var) *pr_ptr__ = &(var); \ |
193 | typeof(var) pr_ret__; \ | |
194 | pr_ret__ = get_cpu_var(*pr_ptr__); \ | |
195 | put_cpu_var(*pr_ptr__); \ | |
196 | pr_ret__; \ | |
066123a5 TH |
197 | }) |
198 | #endif | |
199 | ||
200 | #define __percpu_generic_to_op(var, val, op) \ | |
201 | do { \ | |
f7b64fe8 TH |
202 | typeof(var) *pgto_ptr__ = &(var); \ |
203 | get_cpu_var(*pgto_ptr__) op val; \ | |
204 | put_cpu_var(*pgto_ptr__); \ | |
066123a5 TH |
205 | } while (0) |
206 | ||
207 | #ifndef percpu_write | |
208 | # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) | |
209 | #endif | |
210 | ||
211 | #ifndef percpu_add | |
212 | # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) | |
213 | #endif | |
214 | ||
215 | #ifndef percpu_sub | |
216 | # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) | |
217 | #endif | |
218 | ||
219 | #ifndef percpu_and | |
220 | # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) | |
221 | #endif | |
222 | ||
223 | #ifndef percpu_or | |
224 | # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) | |
225 | #endif | |
226 | ||
227 | #ifndef percpu_xor | |
228 | # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) | |
229 | #endif | |
230 | ||
7340a0b1 CL |
231 | /* |
232 | * Branching function to split up a function into a set of functions that | |
233 | * are called for different scalar sizes of the objects handled. | |
234 | */ | |
235 | ||
236 | extern void __bad_size_call_parameter(void); | |
237 | ||
0f5e4816 TH |
238 | #define __pcpu_size_call_return(stem, variable) \ |
239 | ({ typeof(variable) pscr_ret__; \ | |
7340a0b1 | 240 | switch(sizeof(variable)) { \ |
0f5e4816 TH |
241 | case 1: pscr_ret__ = stem##1(variable);break; \ |
242 | case 2: pscr_ret__ = stem##2(variable);break; \ | |
243 | case 4: pscr_ret__ = stem##4(variable);break; \ | |
244 | case 8: pscr_ret__ = stem##8(variable);break; \ | |
7340a0b1 CL |
245 | default: \ |
246 | __bad_size_call_parameter();break; \ | |
247 | } \ | |
0f5e4816 | 248 | pscr_ret__; \ |
7340a0b1 CL |
249 | }) |
250 | ||
0f5e4816 | 251 | #define __pcpu_size_call(stem, variable, ...) \ |
7340a0b1 CL |
252 | do { \ |
253 | switch(sizeof(variable)) { \ | |
254 | case 1: stem##1(variable, __VA_ARGS__);break; \ | |
255 | case 2: stem##2(variable, __VA_ARGS__);break; \ | |
256 | case 4: stem##4(variable, __VA_ARGS__);break; \ | |
257 | case 8: stem##8(variable, __VA_ARGS__);break; \ | |
258 | default: \ | |
259 | __bad_size_call_parameter();break; \ | |
260 | } \ | |
261 | } while (0) | |
262 | ||
263 | /* | |
264 | * Optimized manipulation for memory allocated through the per cpu | |
dd17c8f7 | 265 | * allocator or for addresses of per cpu variables. |
7340a0b1 CL |
266 | * |
267 | * These operation guarantee exclusivity of access for other operations | |
268 | * on the *same* processor. The assumption is that per cpu data is only | |
269 | * accessed by a single processor instance (the current one). | |
270 | * | |
271 | * The first group is used for accesses that must be done in a | |
272 | * preemption safe way since we know that the context is not preempt | |
273 | * safe. Interrupts may occur. If the interrupt modifies the variable | |
274 | * too then RMW actions will not be reliable. | |
275 | * | |
276 | * The arch code can provide optimized functions in two ways: | |
277 | * | |
278 | * 1. Override the function completely. F.e. define this_cpu_add(). | |
279 | * The arch must then ensure that the various scalar format passed | |
280 | * are handled correctly. | |
281 | * | |
282 | * 2. Provide functions for certain scalar sizes. F.e. provide | |
283 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte | |
284 | * sized RMW actions. If arch code does not provide operations for | |
285 | * a scalar size then the fallback in the generic code will be | |
286 | * used. | |
287 | */ | |
288 | ||
289 | #define _this_cpu_generic_read(pcp) \ | |
290 | ({ typeof(pcp) ret__; \ | |
291 | preempt_disable(); \ | |
292 | ret__ = *this_cpu_ptr(&(pcp)); \ | |
293 | preempt_enable(); \ | |
294 | ret__; \ | |
295 | }) | |
296 | ||
297 | #ifndef this_cpu_read | |
298 | # ifndef this_cpu_read_1 | |
299 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) | |
300 | # endif | |
301 | # ifndef this_cpu_read_2 | |
302 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) | |
303 | # endif | |
304 | # ifndef this_cpu_read_4 | |
305 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) | |
306 | # endif | |
307 | # ifndef this_cpu_read_8 | |
308 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) | |
309 | # endif | |
0f5e4816 | 310 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
7340a0b1 CL |
311 | #endif |
312 | ||
313 | #define _this_cpu_generic_to_op(pcp, val, op) \ | |
314 | do { \ | |
315 | preempt_disable(); \ | |
f7b64fe8 | 316 | *__this_cpu_ptr(&(pcp)) op val; \ |
7340a0b1 CL |
317 | preempt_enable(); \ |
318 | } while (0) | |
319 | ||
320 | #ifndef this_cpu_write | |
321 | # ifndef this_cpu_write_1 | |
322 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
323 | # endif | |
324 | # ifndef this_cpu_write_2 | |
325 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
326 | # endif | |
327 | # ifndef this_cpu_write_4 | |
328 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
329 | # endif | |
330 | # ifndef this_cpu_write_8 | |
331 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
332 | # endif | |
0f5e4816 | 333 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
7340a0b1 CL |
334 | #endif |
335 | ||
336 | #ifndef this_cpu_add | |
337 | # ifndef this_cpu_add_1 | |
338 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
339 | # endif | |
340 | # ifndef this_cpu_add_2 | |
341 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
342 | # endif | |
343 | # ifndef this_cpu_add_4 | |
344 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
345 | # endif | |
346 | # ifndef this_cpu_add_8 | |
347 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
348 | # endif | |
0f5e4816 | 349 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
7340a0b1 CL |
350 | #endif |
351 | ||
352 | #ifndef this_cpu_sub | |
353 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) | |
354 | #endif | |
355 | ||
356 | #ifndef this_cpu_inc | |
357 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) | |
358 | #endif | |
359 | ||
360 | #ifndef this_cpu_dec | |
361 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) | |
362 | #endif | |
363 | ||
364 | #ifndef this_cpu_and | |
365 | # ifndef this_cpu_and_1 | |
366 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
367 | # endif | |
368 | # ifndef this_cpu_and_2 | |
369 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
370 | # endif | |
371 | # ifndef this_cpu_and_4 | |
372 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
373 | # endif | |
374 | # ifndef this_cpu_and_8 | |
375 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
376 | # endif | |
0f5e4816 | 377 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
7340a0b1 CL |
378 | #endif |
379 | ||
380 | #ifndef this_cpu_or | |
381 | # ifndef this_cpu_or_1 | |
382 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
383 | # endif | |
384 | # ifndef this_cpu_or_2 | |
385 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
386 | # endif | |
387 | # ifndef this_cpu_or_4 | |
388 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
389 | # endif | |
390 | # ifndef this_cpu_or_8 | |
391 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
392 | # endif | |
0f5e4816 | 393 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
394 | #endif |
395 | ||
396 | #ifndef this_cpu_xor | |
397 | # ifndef this_cpu_xor_1 | |
398 | # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
399 | # endif | |
400 | # ifndef this_cpu_xor_2 | |
401 | # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
402 | # endif | |
403 | # ifndef this_cpu_xor_4 | |
404 | # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
405 | # endif | |
406 | # ifndef this_cpu_xor_8 | |
407 | # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
408 | # endif | |
0f5e4816 | 409 | # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
410 | #endif |
411 | ||
412 | /* | |
413 | * Generic percpu operations that do not require preemption handling. | |
414 | * Either we do not care about races or the caller has the | |
415 | * responsibility of handling preemptions issues. Arch code can still | |
416 | * override these instructions since the arch per cpu code may be more | |
417 | * efficient and may actually get race freeness for free (that is the | |
418 | * case for x86 for example). | |
419 | * | |
420 | * If there is no other protection through preempt disable and/or | |
421 | * disabling interupts then one of these RMW operations can show unexpected | |
422 | * behavior because the execution thread was rescheduled on another processor | |
423 | * or an interrupt occurred and the same percpu variable was modified from | |
424 | * the interrupt context. | |
425 | */ | |
426 | #ifndef __this_cpu_read | |
427 | # ifndef __this_cpu_read_1 | |
428 | # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) | |
429 | # endif | |
430 | # ifndef __this_cpu_read_2 | |
431 | # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) | |
432 | # endif | |
433 | # ifndef __this_cpu_read_4 | |
434 | # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) | |
435 | # endif | |
436 | # ifndef __this_cpu_read_8 | |
437 | # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) | |
438 | # endif | |
0f5e4816 | 439 | # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) |
7340a0b1 CL |
440 | #endif |
441 | ||
442 | #define __this_cpu_generic_to_op(pcp, val, op) \ | |
443 | do { \ | |
444 | *__this_cpu_ptr(&(pcp)) op val; \ | |
445 | } while (0) | |
446 | ||
447 | #ifndef __this_cpu_write | |
448 | # ifndef __this_cpu_write_1 | |
449 | # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
450 | # endif | |
451 | # ifndef __this_cpu_write_2 | |
452 | # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
453 | # endif | |
454 | # ifndef __this_cpu_write_4 | |
455 | # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
456 | # endif | |
457 | # ifndef __this_cpu_write_8 | |
458 | # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
459 | # endif | |
0f5e4816 | 460 | # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) |
7340a0b1 CL |
461 | #endif |
462 | ||
463 | #ifndef __this_cpu_add | |
464 | # ifndef __this_cpu_add_1 | |
465 | # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
466 | # endif | |
467 | # ifndef __this_cpu_add_2 | |
468 | # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
469 | # endif | |
470 | # ifndef __this_cpu_add_4 | |
471 | # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
472 | # endif | |
473 | # ifndef __this_cpu_add_8 | |
474 | # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
475 | # endif | |
0f5e4816 | 476 | # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) |
7340a0b1 CL |
477 | #endif |
478 | ||
479 | #ifndef __this_cpu_sub | |
480 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) | |
481 | #endif | |
482 | ||
483 | #ifndef __this_cpu_inc | |
484 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) | |
485 | #endif | |
486 | ||
487 | #ifndef __this_cpu_dec | |
488 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) | |
489 | #endif | |
490 | ||
491 | #ifndef __this_cpu_and | |
492 | # ifndef __this_cpu_and_1 | |
493 | # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
494 | # endif | |
495 | # ifndef __this_cpu_and_2 | |
496 | # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
497 | # endif | |
498 | # ifndef __this_cpu_and_4 | |
499 | # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
500 | # endif | |
501 | # ifndef __this_cpu_and_8 | |
502 | # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
503 | # endif | |
0f5e4816 | 504 | # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) |
7340a0b1 CL |
505 | #endif |
506 | ||
507 | #ifndef __this_cpu_or | |
508 | # ifndef __this_cpu_or_1 | |
509 | # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
510 | # endif | |
511 | # ifndef __this_cpu_or_2 | |
512 | # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
513 | # endif | |
514 | # ifndef __this_cpu_or_4 | |
515 | # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
516 | # endif | |
517 | # ifndef __this_cpu_or_8 | |
518 | # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
519 | # endif | |
0f5e4816 | 520 | # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
521 | #endif |
522 | ||
523 | #ifndef __this_cpu_xor | |
524 | # ifndef __this_cpu_xor_1 | |
525 | # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
526 | # endif | |
527 | # ifndef __this_cpu_xor_2 | |
528 | # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
529 | # endif | |
530 | # ifndef __this_cpu_xor_4 | |
531 | # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
532 | # endif | |
533 | # ifndef __this_cpu_xor_8 | |
534 | # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
535 | # endif | |
0f5e4816 | 536 | # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) |
7340a0b1 CL |
537 | #endif |
538 | ||
539 | /* | |
540 | * IRQ safe versions of the per cpu RMW operations. Note that these operations | |
541 | * are *not* safe against modification of the same variable from another | |
542 | * processors (which one gets when using regular atomic operations) | |
543 | . They are guaranteed to be atomic vs. local interrupts and | |
544 | * preemption only. | |
545 | */ | |
546 | #define irqsafe_cpu_generic_to_op(pcp, val, op) \ | |
547 | do { \ | |
548 | unsigned long flags; \ | |
549 | local_irq_save(flags); \ | |
550 | *__this_cpu_ptr(&(pcp)) op val; \ | |
551 | local_irq_restore(flags); \ | |
552 | } while (0) | |
553 | ||
554 | #ifndef irqsafe_cpu_add | |
555 | # ifndef irqsafe_cpu_add_1 | |
556 | # define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
557 | # endif | |
558 | # ifndef irqsafe_cpu_add_2 | |
559 | # define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
560 | # endif | |
561 | # ifndef irqsafe_cpu_add_4 | |
562 | # define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
563 | # endif | |
564 | # ifndef irqsafe_cpu_add_8 | |
565 | # define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) | |
566 | # endif | |
0f5e4816 | 567 | # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val)) |
7340a0b1 CL |
568 | #endif |
569 | ||
570 | #ifndef irqsafe_cpu_sub | |
571 | # define irqsafe_cpu_sub(pcp, val) irqsafe_cpu_add((pcp), -(val)) | |
572 | #endif | |
573 | ||
574 | #ifndef irqsafe_cpu_inc | |
575 | # define irqsafe_cpu_inc(pcp) irqsafe_cpu_add((pcp), 1) | |
576 | #endif | |
577 | ||
578 | #ifndef irqsafe_cpu_dec | |
579 | # define irqsafe_cpu_dec(pcp) irqsafe_cpu_sub((pcp), 1) | |
580 | #endif | |
581 | ||
582 | #ifndef irqsafe_cpu_and | |
583 | # ifndef irqsafe_cpu_and_1 | |
584 | # define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
585 | # endif | |
586 | # ifndef irqsafe_cpu_and_2 | |
587 | # define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
588 | # endif | |
589 | # ifndef irqsafe_cpu_and_4 | |
590 | # define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
591 | # endif | |
592 | # ifndef irqsafe_cpu_and_8 | |
593 | # define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) | |
594 | # endif | |
0f5e4816 | 595 | # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val)) |
7340a0b1 CL |
596 | #endif |
597 | ||
598 | #ifndef irqsafe_cpu_or | |
599 | # ifndef irqsafe_cpu_or_1 | |
600 | # define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
601 | # endif | |
602 | # ifndef irqsafe_cpu_or_2 | |
603 | # define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
604 | # endif | |
605 | # ifndef irqsafe_cpu_or_4 | |
606 | # define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
607 | # endif | |
608 | # ifndef irqsafe_cpu_or_8 | |
609 | # define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) | |
610 | # endif | |
0f5e4816 | 611 | # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val)) |
7340a0b1 CL |
612 | #endif |
613 | ||
614 | #ifndef irqsafe_cpu_xor | |
615 | # ifndef irqsafe_cpu_xor_1 | |
616 | # define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
617 | # endif | |
618 | # ifndef irqsafe_cpu_xor_2 | |
619 | # define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
620 | # endif | |
621 | # ifndef irqsafe_cpu_xor_4 | |
622 | # define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
623 | # endif | |
624 | # ifndef irqsafe_cpu_xor_8 | |
625 | # define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) | |
626 | # endif | |
0f5e4816 | 627 | # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val)) |
7340a0b1 CL |
628 | #endif |
629 | ||
1da177e4 | 630 | #endif /* __LINUX_PERCPU_H */ |