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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 | 5 | #include <linux/smp.h> |
7ff6f082 | 6 | #include <linux/cpumask.h> |
6a242909 | 7 | #include <linux/pfn.h> |
de380b55 | 8 | #include <linux/init.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 | 41 | |
8b8e2ec1 PZ |
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 | ||
8d408b4b | 51 | /* minimum unit size, also is the maximum supported allocation size */ |
6abad5ac | 52 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
8d408b4b | 53 | |
099a19d9 TH |
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 | ||
8d408b4b TH |
64 | /* |
65 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
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). | |
8d408b4b | 69 | * |
6b19b0c2 TH |
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. | |
8d408b4b | 74 | */ |
6b19b0c2 TH |
75 | #if BITS_PER_LONG > 32 |
76 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
77 | #else | |
78 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
79 | #endif | |
8d408b4b | 80 | |
fbf59bc9 | 81 | extern void *pcpu_base_addr; |
fb435d52 | 82 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 83 | |
fd1e8a1f TH |
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 | ||
f58dc01b TH |
103 | enum pcpu_fc { |
104 | PCPU_FC_AUTO, | |
105 | PCPU_FC_EMBED, | |
106 | PCPU_FC_PAGE, | |
f58dc01b TH |
107 | |
108 | PCPU_FC_NR, | |
109 | }; | |
110 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
111 | ||
112 | extern enum pcpu_fc pcpu_chosen_fc; | |
113 | ||
3cbc8565 TH |
114 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
115 | size_t align); | |
d4b95f80 TH |
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); | |
a530b795 | 118 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 119 | |
fd1e8a1f TH |
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 | ||
fb435d52 TH |
124 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
125 | void *base_addr); | |
8d408b4b | 126 | |
08fc4580 | 127 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
4ba6ce25 | 128 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
c8826dd5 TH |
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); | |
08fc4580 | 133 | #endif |
66c3a757 | 134 | |
08fc4580 | 135 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 136 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
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); | |
08fc4580 | 140 | #endif |
d4b95f80 | 141 | |
f2a8205c TH |
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 | */ | |
bbddff05 | 147 | #ifdef CONFIG_SMP |
fbf59bc9 | 148 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
bbddff05 TH |
149 | #else |
150 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) | |
151 | #endif | |
fbf59bc9 | 152 | |
e0fdb0e0 | 153 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
10fad5e4 | 154 | extern bool is_kernel_percpu_address(unsigned long addr); |
1da177e4 | 155 | |
bbddff05 | 156 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
e74e3962 TH |
157 | extern void __init setup_per_cpu_areas(void); |
158 | #endif | |
099a19d9 | 159 | extern void __init percpu_init_late(void); |
e74e3962 | 160 | |
de380b55 TH |
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 | ||
64ef291f | 165 | #define alloc_percpu(type) \ |
e0fdb0e0 | 166 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
1da177e4 | 167 | |
066123a5 TH |
168 | /* |
169 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
170 | * | |
171 | * @var can be a percpu variable or a field of it and its size should | |
172 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
173 | * all others to void. | |
174 | * | |
933393f5 CL |
175 | * These operations are guaranteed to be atomic. |
176 | * The generic versions disable interrupts. Archs are | |
066123a5 | 177 | * encouraged to implement single-instruction alternatives which don't |
933393f5 | 178 | * require protection. |
066123a5 TH |
179 | */ |
180 | #ifndef percpu_read | |
181 | # define percpu_read(var) \ | |
182 | ({ \ | |
f7b64fe8 TH |
183 | typeof(var) *pr_ptr__ = &(var); \ |
184 | typeof(var) pr_ret__; \ | |
185 | pr_ret__ = get_cpu_var(*pr_ptr__); \ | |
186 | put_cpu_var(*pr_ptr__); \ | |
187 | pr_ret__; \ | |
066123a5 TH |
188 | }) |
189 | #endif | |
190 | ||
191 | #define __percpu_generic_to_op(var, val, op) \ | |
192 | do { \ | |
f7b64fe8 TH |
193 | typeof(var) *pgto_ptr__ = &(var); \ |
194 | get_cpu_var(*pgto_ptr__) op val; \ | |
195 | put_cpu_var(*pgto_ptr__); \ | |
066123a5 TH |
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 | ||
0f5e4816 TH |
229 | #define __pcpu_size_call_return(stem, variable) \ |
230 | ({ typeof(variable) pscr_ret__; \ | |
545695fb | 231 | __verify_pcpu_ptr(&(variable)); \ |
7340a0b1 | 232 | switch(sizeof(variable)) { \ |
0f5e4816 TH |
233 | case 1: pscr_ret__ = stem##1(variable);break; \ |
234 | case 2: pscr_ret__ = stem##2(variable);break; \ | |
235 | case 4: pscr_ret__ = stem##4(variable);break; \ | |
236 | case 8: pscr_ret__ = stem##8(variable);break; \ | |
7340a0b1 CL |
237 | default: \ |
238 | __bad_size_call_parameter();break; \ | |
239 | } \ | |
0f5e4816 | 240 | pscr_ret__; \ |
7340a0b1 CL |
241 | }) |
242 | ||
a663ffff CL |
243 | #define __pcpu_size_call_return2(stem, variable, ...) \ |
244 | ({ \ | |
245 | typeof(variable) pscr2_ret__; \ | |
246 | __verify_pcpu_ptr(&(variable)); \ | |
247 | switch(sizeof(variable)) { \ | |
248 | case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ | |
249 | case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ | |
250 | case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ | |
251 | case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ | |
252 | default: \ | |
253 | __bad_size_call_parameter(); break; \ | |
254 | } \ | |
255 | pscr2_ret__; \ | |
256 | }) | |
257 | ||
7c334339 CL |
258 | /* |
259 | * Special handling for cmpxchg_double. cmpxchg_double is passed two | |
260 | * percpu variables. The first has to be aligned to a double word | |
261 | * boundary and the second has to follow directly thereafter. | |
d4d84fef CM |
262 | * We enforce this on all architectures even if they don't support |
263 | * a double cmpxchg instruction, since it's a cheap requirement, and it | |
264 | * avoids breaking the requirement for architectures with the instruction. | |
7c334339 CL |
265 | */ |
266 | #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ | |
267 | ({ \ | |
268 | bool pdcrb_ret__; \ | |
269 | __verify_pcpu_ptr(&pcp1); \ | |
270 | BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ | |
271 | VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1))); \ | |
272 | VM_BUG_ON((unsigned long)(&pcp2) != \ | |
273 | (unsigned long)(&pcp1) + sizeof(pcp1)); \ | |
274 | switch(sizeof(pcp1)) { \ | |
275 | case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ | |
276 | case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ | |
277 | case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ | |
278 | case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ | |
279 | default: \ | |
280 | __bad_size_call_parameter(); break; \ | |
281 | } \ | |
282 | pdcrb_ret__; \ | |
283 | }) | |
284 | ||
0f5e4816 | 285 | #define __pcpu_size_call(stem, variable, ...) \ |
7340a0b1 | 286 | do { \ |
545695fb | 287 | __verify_pcpu_ptr(&(variable)); \ |
7340a0b1 CL |
288 | switch(sizeof(variable)) { \ |
289 | case 1: stem##1(variable, __VA_ARGS__);break; \ | |
290 | case 2: stem##2(variable, __VA_ARGS__);break; \ | |
291 | case 4: stem##4(variable, __VA_ARGS__);break; \ | |
292 | case 8: stem##8(variable, __VA_ARGS__);break; \ | |
293 | default: \ | |
294 | __bad_size_call_parameter();break; \ | |
295 | } \ | |
296 | } while (0) | |
297 | ||
298 | /* | |
299 | * Optimized manipulation for memory allocated through the per cpu | |
dd17c8f7 | 300 | * allocator or for addresses of per cpu variables. |
7340a0b1 CL |
301 | * |
302 | * These operation guarantee exclusivity of access for other operations | |
303 | * on the *same* processor. The assumption is that per cpu data is only | |
304 | * accessed by a single processor instance (the current one). | |
305 | * | |
306 | * The first group is used for accesses that must be done in a | |
307 | * preemption safe way since we know that the context is not preempt | |
308 | * safe. Interrupts may occur. If the interrupt modifies the variable | |
309 | * too then RMW actions will not be reliable. | |
310 | * | |
311 | * The arch code can provide optimized functions in two ways: | |
312 | * | |
313 | * 1. Override the function completely. F.e. define this_cpu_add(). | |
314 | * The arch must then ensure that the various scalar format passed | |
315 | * are handled correctly. | |
316 | * | |
317 | * 2. Provide functions for certain scalar sizes. F.e. provide | |
318 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte | |
319 | * sized RMW actions. If arch code does not provide operations for | |
320 | * a scalar size then the fallback in the generic code will be | |
321 | * used. | |
322 | */ | |
323 | ||
324 | #define _this_cpu_generic_read(pcp) \ | |
325 | ({ typeof(pcp) ret__; \ | |
326 | preempt_disable(); \ | |
327 | ret__ = *this_cpu_ptr(&(pcp)); \ | |
328 | preempt_enable(); \ | |
329 | ret__; \ | |
330 | }) | |
331 | ||
332 | #ifndef this_cpu_read | |
333 | # ifndef this_cpu_read_1 | |
334 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) | |
335 | # endif | |
336 | # ifndef this_cpu_read_2 | |
337 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) | |
338 | # endif | |
339 | # ifndef this_cpu_read_4 | |
340 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) | |
341 | # endif | |
342 | # ifndef this_cpu_read_8 | |
343 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) | |
344 | # endif | |
0f5e4816 | 345 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
7340a0b1 CL |
346 | #endif |
347 | ||
348 | #define _this_cpu_generic_to_op(pcp, val, op) \ | |
349 | do { \ | |
933393f5 CL |
350 | unsigned long flags; \ |
351 | local_irq_save(flags); \ | |
f7b64fe8 | 352 | *__this_cpu_ptr(&(pcp)) op val; \ |
933393f5 | 353 | local_irq_restore(flags); \ |
7340a0b1 CL |
354 | } while (0) |
355 | ||
356 | #ifndef this_cpu_write | |
357 | # ifndef this_cpu_write_1 | |
358 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
359 | # endif | |
360 | # ifndef this_cpu_write_2 | |
361 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
362 | # endif | |
363 | # ifndef this_cpu_write_4 | |
364 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
365 | # endif | |
366 | # ifndef this_cpu_write_8 | |
367 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
368 | # endif | |
0f5e4816 | 369 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
7340a0b1 CL |
370 | #endif |
371 | ||
372 | #ifndef this_cpu_add | |
373 | # ifndef this_cpu_add_1 | |
374 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
375 | # endif | |
376 | # ifndef this_cpu_add_2 | |
377 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
378 | # endif | |
379 | # ifndef this_cpu_add_4 | |
380 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
381 | # endif | |
382 | # ifndef this_cpu_add_8 | |
383 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
384 | # endif | |
0f5e4816 | 385 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
7340a0b1 CL |
386 | #endif |
387 | ||
388 | #ifndef this_cpu_sub | |
389 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) | |
390 | #endif | |
391 | ||
392 | #ifndef this_cpu_inc | |
393 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) | |
394 | #endif | |
395 | ||
396 | #ifndef this_cpu_dec | |
397 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) | |
398 | #endif | |
399 | ||
400 | #ifndef this_cpu_and | |
401 | # ifndef this_cpu_and_1 | |
402 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
403 | # endif | |
404 | # ifndef this_cpu_and_2 | |
405 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
406 | # endif | |
407 | # ifndef this_cpu_and_4 | |
408 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
409 | # endif | |
410 | # ifndef this_cpu_and_8 | |
411 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
412 | # endif | |
0f5e4816 | 413 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
7340a0b1 CL |
414 | #endif |
415 | ||
416 | #ifndef this_cpu_or | |
417 | # ifndef this_cpu_or_1 | |
418 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
419 | # endif | |
420 | # ifndef this_cpu_or_2 | |
421 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
422 | # endif | |
423 | # ifndef this_cpu_or_4 | |
424 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
425 | # endif | |
426 | # ifndef this_cpu_or_8 | |
427 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
428 | # endif | |
0f5e4816 | 429 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
430 | #endif |
431 | ||
432 | #ifndef this_cpu_xor | |
433 | # ifndef this_cpu_xor_1 | |
434 | # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
435 | # endif | |
436 | # ifndef this_cpu_xor_2 | |
437 | # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
438 | # endif | |
439 | # ifndef this_cpu_xor_4 | |
440 | # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
441 | # endif | |
442 | # ifndef this_cpu_xor_8 | |
443 | # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) | |
444 | # endif | |
0f5e4816 | 445 | # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
446 | #endif |
447 | ||
40304775 TH |
448 | #define _this_cpu_generic_add_return(pcp, val) \ |
449 | ({ \ | |
450 | typeof(pcp) ret__; \ | |
933393f5 CL |
451 | unsigned long flags; \ |
452 | local_irq_save(flags); \ | |
40304775 TH |
453 | __this_cpu_add(pcp, val); \ |
454 | ret__ = __this_cpu_read(pcp); \ | |
933393f5 | 455 | local_irq_restore(flags); \ |
40304775 TH |
456 | ret__; \ |
457 | }) | |
458 | ||
459 | #ifndef this_cpu_add_return | |
460 | # ifndef this_cpu_add_return_1 | |
461 | # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
462 | # endif | |
463 | # ifndef this_cpu_add_return_2 | |
464 | # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
465 | # endif | |
466 | # ifndef this_cpu_add_return_4 | |
467 | # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
468 | # endif | |
469 | # ifndef this_cpu_add_return_8 | |
470 | # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
471 | # endif | |
472 | # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) | |
473 | #endif | |
474 | ||
475 | #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) | |
476 | #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) | |
477 | #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) | |
478 | ||
2b712442 CL |
479 | #define _this_cpu_generic_xchg(pcp, nval) \ |
480 | ({ typeof(pcp) ret__; \ | |
933393f5 CL |
481 | unsigned long flags; \ |
482 | local_irq_save(flags); \ | |
2b712442 CL |
483 | ret__ = __this_cpu_read(pcp); \ |
484 | __this_cpu_write(pcp, nval); \ | |
933393f5 | 485 | local_irq_restore(flags); \ |
2b712442 CL |
486 | ret__; \ |
487 | }) | |
488 | ||
489 | #ifndef this_cpu_xchg | |
490 | # ifndef this_cpu_xchg_1 | |
491 | # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
492 | # endif | |
493 | # ifndef this_cpu_xchg_2 | |
494 | # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
495 | # endif | |
496 | # ifndef this_cpu_xchg_4 | |
497 | # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
498 | # endif | |
499 | # ifndef this_cpu_xchg_8 | |
500 | # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
501 | # endif | |
502 | # define this_cpu_xchg(pcp, nval) \ | |
503 | __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) | |
504 | #endif | |
505 | ||
506 | #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ | |
933393f5 CL |
507 | ({ \ |
508 | typeof(pcp) ret__; \ | |
509 | unsigned long flags; \ | |
510 | local_irq_save(flags); \ | |
2b712442 CL |
511 | ret__ = __this_cpu_read(pcp); \ |
512 | if (ret__ == (oval)) \ | |
513 | __this_cpu_write(pcp, nval); \ | |
933393f5 | 514 | local_irq_restore(flags); \ |
2b712442 CL |
515 | ret__; \ |
516 | }) | |
517 | ||
518 | #ifndef this_cpu_cmpxchg | |
519 | # ifndef this_cpu_cmpxchg_1 | |
520 | # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
521 | # endif | |
522 | # ifndef this_cpu_cmpxchg_2 | |
523 | # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
524 | # endif | |
525 | # ifndef this_cpu_cmpxchg_4 | |
526 | # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
527 | # endif | |
528 | # ifndef this_cpu_cmpxchg_8 | |
529 | # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
530 | # endif | |
531 | # define this_cpu_cmpxchg(pcp, oval, nval) \ | |
532 | __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) | |
533 | #endif | |
534 | ||
7c334339 CL |
535 | /* |
536 | * cmpxchg_double replaces two adjacent scalars at once. The first | |
537 | * two parameters are per cpu variables which have to be of the same | |
538 | * size. A truth value is returned to indicate success or failure | |
539 | * (since a double register result is difficult to handle). There is | |
540 | * very limited hardware support for these operations, so only certain | |
541 | * sizes may work. | |
542 | */ | |
543 | #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
544 | ({ \ | |
545 | int ret__; \ | |
933393f5 CL |
546 | unsigned long flags; \ |
547 | local_irq_save(flags); \ | |
7c334339 CL |
548 | ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ |
549 | oval1, oval2, nval1, nval2); \ | |
933393f5 | 550 | local_irq_restore(flags); \ |
7c334339 CL |
551 | ret__; \ |
552 | }) | |
553 | ||
554 | #ifndef this_cpu_cmpxchg_double | |
555 | # ifndef this_cpu_cmpxchg_double_1 | |
556 | # define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
557 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
558 | # endif | |
559 | # ifndef this_cpu_cmpxchg_double_2 | |
560 | # define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
561 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
562 | # endif | |
563 | # ifndef this_cpu_cmpxchg_double_4 | |
564 | # define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
565 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
566 | # endif | |
567 | # ifndef this_cpu_cmpxchg_double_8 | |
568 | # define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
569 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
570 | # endif | |
571 | # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
572 | __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) | |
573 | #endif | |
574 | ||
7340a0b1 | 575 | /* |
933393f5 | 576 | * Generic percpu operations for context that are safe from preemption/interrupts. |
7340a0b1 | 577 | * Either we do not care about races or the caller has the |
933393f5 | 578 | * responsibility of handling preemption/interrupt issues. Arch code can still |
7340a0b1 CL |
579 | * override these instructions since the arch per cpu code may be more |
580 | * efficient and may actually get race freeness for free (that is the | |
581 | * case for x86 for example). | |
582 | * | |
583 | * If there is no other protection through preempt disable and/or | |
584 | * disabling interupts then one of these RMW operations can show unexpected | |
585 | * behavior because the execution thread was rescheduled on another processor | |
586 | * or an interrupt occurred and the same percpu variable was modified from | |
587 | * the interrupt context. | |
588 | */ | |
589 | #ifndef __this_cpu_read | |
590 | # ifndef __this_cpu_read_1 | |
591 | # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) | |
592 | # endif | |
593 | # ifndef __this_cpu_read_2 | |
594 | # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) | |
595 | # endif | |
596 | # ifndef __this_cpu_read_4 | |
597 | # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) | |
598 | # endif | |
599 | # ifndef __this_cpu_read_8 | |
600 | # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) | |
601 | # endif | |
0f5e4816 | 602 | # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) |
7340a0b1 CL |
603 | #endif |
604 | ||
605 | #define __this_cpu_generic_to_op(pcp, val, op) \ | |
606 | do { \ | |
607 | *__this_cpu_ptr(&(pcp)) op val; \ | |
608 | } while (0) | |
609 | ||
610 | #ifndef __this_cpu_write | |
611 | # ifndef __this_cpu_write_1 | |
612 | # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
613 | # endif | |
614 | # ifndef __this_cpu_write_2 | |
615 | # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
616 | # endif | |
617 | # ifndef __this_cpu_write_4 | |
618 | # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
619 | # endif | |
620 | # ifndef __this_cpu_write_8 | |
621 | # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
622 | # endif | |
0f5e4816 | 623 | # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) |
7340a0b1 CL |
624 | #endif |
625 | ||
626 | #ifndef __this_cpu_add | |
627 | # ifndef __this_cpu_add_1 | |
628 | # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
629 | # endif | |
630 | # ifndef __this_cpu_add_2 | |
631 | # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
632 | # endif | |
633 | # ifndef __this_cpu_add_4 | |
634 | # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
635 | # endif | |
636 | # ifndef __this_cpu_add_8 | |
637 | # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
638 | # endif | |
0f5e4816 | 639 | # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) |
7340a0b1 CL |
640 | #endif |
641 | ||
642 | #ifndef __this_cpu_sub | |
643 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) | |
644 | #endif | |
645 | ||
646 | #ifndef __this_cpu_inc | |
647 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) | |
648 | #endif | |
649 | ||
650 | #ifndef __this_cpu_dec | |
651 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) | |
652 | #endif | |
653 | ||
654 | #ifndef __this_cpu_and | |
655 | # ifndef __this_cpu_and_1 | |
656 | # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
657 | # endif | |
658 | # ifndef __this_cpu_and_2 | |
659 | # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
660 | # endif | |
661 | # ifndef __this_cpu_and_4 | |
662 | # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
663 | # endif | |
664 | # ifndef __this_cpu_and_8 | |
665 | # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
666 | # endif | |
0f5e4816 | 667 | # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) |
7340a0b1 CL |
668 | #endif |
669 | ||
670 | #ifndef __this_cpu_or | |
671 | # ifndef __this_cpu_or_1 | |
672 | # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
673 | # endif | |
674 | # ifndef __this_cpu_or_2 | |
675 | # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
676 | # endif | |
677 | # ifndef __this_cpu_or_4 | |
678 | # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
679 | # endif | |
680 | # ifndef __this_cpu_or_8 | |
681 | # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
682 | # endif | |
0f5e4816 | 683 | # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) |
7340a0b1 CL |
684 | #endif |
685 | ||
686 | #ifndef __this_cpu_xor | |
687 | # ifndef __this_cpu_xor_1 | |
688 | # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
689 | # endif | |
690 | # ifndef __this_cpu_xor_2 | |
691 | # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
692 | # endif | |
693 | # ifndef __this_cpu_xor_4 | |
694 | # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
695 | # endif | |
696 | # ifndef __this_cpu_xor_8 | |
697 | # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) | |
698 | # endif | |
0f5e4816 | 699 | # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) |
7340a0b1 CL |
700 | #endif |
701 | ||
a663ffff CL |
702 | #define __this_cpu_generic_add_return(pcp, val) \ |
703 | ({ \ | |
704 | __this_cpu_add(pcp, val); \ | |
705 | __this_cpu_read(pcp); \ | |
706 | }) | |
707 | ||
708 | #ifndef __this_cpu_add_return | |
709 | # ifndef __this_cpu_add_return_1 | |
710 | # define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
711 | # endif | |
712 | # ifndef __this_cpu_add_return_2 | |
713 | # define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
714 | # endif | |
715 | # ifndef __this_cpu_add_return_4 | |
716 | # define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
717 | # endif | |
718 | # ifndef __this_cpu_add_return_8 | |
719 | # define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
720 | # endif | |
721 | # define __this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) | |
722 | #endif | |
723 | ||
724 | #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) | |
725 | #define __this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) | |
726 | #define __this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) | |
727 | ||
2b712442 CL |
728 | #define __this_cpu_generic_xchg(pcp, nval) \ |
729 | ({ typeof(pcp) ret__; \ | |
730 | ret__ = __this_cpu_read(pcp); \ | |
731 | __this_cpu_write(pcp, nval); \ | |
732 | ret__; \ | |
733 | }) | |
734 | ||
735 | #ifndef __this_cpu_xchg | |
736 | # ifndef __this_cpu_xchg_1 | |
737 | # define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
738 | # endif | |
739 | # ifndef __this_cpu_xchg_2 | |
740 | # define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
741 | # endif | |
742 | # ifndef __this_cpu_xchg_4 | |
743 | # define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
744 | # endif | |
745 | # ifndef __this_cpu_xchg_8 | |
746 | # define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
747 | # endif | |
748 | # define __this_cpu_xchg(pcp, nval) \ | |
749 | __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) | |
750 | #endif | |
751 | ||
752 | #define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ | |
753 | ({ \ | |
754 | typeof(pcp) ret__; \ | |
755 | ret__ = __this_cpu_read(pcp); \ | |
756 | if (ret__ == (oval)) \ | |
757 | __this_cpu_write(pcp, nval); \ | |
758 | ret__; \ | |
759 | }) | |
760 | ||
761 | #ifndef __this_cpu_cmpxchg | |
762 | # ifndef __this_cpu_cmpxchg_1 | |
763 | # define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
764 | # endif | |
765 | # ifndef __this_cpu_cmpxchg_2 | |
766 | # define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
767 | # endif | |
768 | # ifndef __this_cpu_cmpxchg_4 | |
769 | # define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
770 | # endif | |
771 | # ifndef __this_cpu_cmpxchg_8 | |
772 | # define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
773 | # endif | |
774 | # define __this_cpu_cmpxchg(pcp, oval, nval) \ | |
775 | __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) | |
776 | #endif | |
777 | ||
7c334339 CL |
778 | #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
779 | ({ \ | |
780 | int __ret = 0; \ | |
781 | if (__this_cpu_read(pcp1) == (oval1) && \ | |
782 | __this_cpu_read(pcp2) == (oval2)) { \ | |
783 | __this_cpu_write(pcp1, (nval1)); \ | |
784 | __this_cpu_write(pcp2, (nval2)); \ | |
785 | __ret = 1; \ | |
786 | } \ | |
787 | (__ret); \ | |
788 | }) | |
789 | ||
790 | #ifndef __this_cpu_cmpxchg_double | |
791 | # ifndef __this_cpu_cmpxchg_double_1 | |
792 | # define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
793 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
794 | # endif | |
795 | # ifndef __this_cpu_cmpxchg_double_2 | |
796 | # define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
797 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
798 | # endif | |
799 | # ifndef __this_cpu_cmpxchg_double_4 | |
800 | # define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
801 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
802 | # endif | |
803 | # ifndef __this_cpu_cmpxchg_double_8 | |
804 | # define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
805 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
806 | # endif | |
807 | # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
808 | __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) | |
809 | #endif | |
810 | ||
1da177e4 | 811 | #endif /* __LINUX_PERCPU_H */ |