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1da177e4 LT |
1 | #ifndef __LINUX_CPUMASK_H |
2 | #define __LINUX_CPUMASK_H | |
3 | ||
4 | /* | |
5 | * Cpumasks provide a bitmap suitable for representing the | |
6ba2ef7b RR |
6 | * set of CPU's in a system, one bit position per CPU number. In general, |
7 | * only nr_cpu_ids (<= NR_CPUS) bits are valid. | |
1da177e4 | 8 | */ |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/threads.h> | |
11 | #include <linux/bitmap.h> | |
187f1882 | 12 | #include <linux/bug.h> |
1da177e4 | 13 | |
cdfdef75 | 14 | /* Don't assign or return these: may not be this big! */ |
2d3854a3 | 15 | typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; |
1da177e4 | 16 | |
ae7a47e7 | 17 | /** |
6ba2ef7b RR |
18 | * cpumask_bits - get the bits in a cpumask |
19 | * @maskp: the struct cpumask * | |
ae7a47e7 | 20 | * |
6ba2ef7b RR |
21 | * You should only assume nr_cpu_ids bits of this mask are valid. This is |
22 | * a macro so it's const-correct. | |
ae7a47e7 | 23 | */ |
6ba2ef7b | 24 | #define cpumask_bits(maskp) ((maskp)->bits) |
7ea931c9 | 25 | |
f1bbc032 TH |
26 | /** |
27 | * cpumask_pr_args - printf args to output a cpumask | |
28 | * @maskp: cpumask to be printed | |
29 | * | |
30 | * Can be used to provide arguments for '%*pb[l]' when printing a cpumask. | |
31 | */ | |
32 | #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp) | |
33 | ||
41df0d61 | 34 | #if NR_CPUS == 1 |
41df0d61 | 35 | #define nr_cpu_ids 1 |
6ba2ef7b | 36 | #else |
41df0d61 | 37 | extern int nr_cpu_ids; |
41df0d61 MT |
38 | #endif |
39 | ||
6ba2ef7b RR |
40 | #ifdef CONFIG_CPUMASK_OFFSTACK |
41 | /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also, | |
42 | * not all bits may be allocated. */ | |
43 | #define nr_cpumask_bits nr_cpu_ids | |
44 | #else | |
45 | #define nr_cpumask_bits NR_CPUS | |
46 | #endif | |
1da177e4 LT |
47 | |
48 | /* | |
49 | * The following particular system cpumasks and operations manage | |
b3199c02 | 50 | * possible, present, active and online cpus. |
1da177e4 | 51 | * |
b3199c02 RR |
52 | * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable |
53 | * cpu_present_mask - has bit 'cpu' set iff cpu is populated | |
54 | * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler | |
55 | * cpu_active_mask - has bit 'cpu' set iff cpu available to migration | |
1da177e4 | 56 | * |
b3199c02 | 57 | * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. |
1da177e4 | 58 | * |
b3199c02 RR |
59 | * The cpu_possible_mask is fixed at boot time, as the set of CPU id's |
60 | * that it is possible might ever be plugged in at anytime during the | |
61 | * life of that system boot. The cpu_present_mask is dynamic(*), | |
62 | * representing which CPUs are currently plugged in. And | |
63 | * cpu_online_mask is the dynamic subset of cpu_present_mask, | |
64 | * indicating those CPUs available for scheduling. | |
65 | * | |
66 | * If HOTPLUG is enabled, then cpu_possible_mask is forced to have | |
1da177e4 LT |
67 | * all NR_CPUS bits set, otherwise it is just the set of CPUs that |
68 | * ACPI reports present at boot. | |
69 | * | |
b3199c02 | 70 | * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, |
1da177e4 | 71 | * depending on what ACPI reports as currently plugged in, otherwise |
b3199c02 | 72 | * cpu_present_mask is just a copy of cpu_possible_mask. |
1da177e4 | 73 | * |
b3199c02 RR |
74 | * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not |
75 | * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. | |
1da177e4 LT |
76 | * |
77 | * Subtleties: | |
78 | * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode | |
79 | * assumption that their single CPU is online. The UP | |
b3199c02 | 80 | * cpu_{online,possible,present}_masks are placebos. Changing them |
1da177e4 LT |
81 | * will have no useful affect on the following num_*_cpus() |
82 | * and cpu_*() macros in the UP case. This ugliness is a UP | |
83 | * optimization - don't waste any instructions or memory references | |
84 | * asking if you're online or how many CPUs there are if there is | |
85 | * only one CPU. | |
1da177e4 LT |
86 | */ |
87 | ||
4b804c85 RV |
88 | extern struct cpumask __cpu_possible_mask; |
89 | extern struct cpumask __cpu_online_mask; | |
90 | extern struct cpumask __cpu_present_mask; | |
91 | extern struct cpumask __cpu_active_mask; | |
5aec01b8 RV |
92 | #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask) |
93 | #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask) | |
94 | #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask) | |
95 | #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask) | |
b3199c02 | 96 | |
1da177e4 | 97 | #if NR_CPUS > 1 |
ae7a47e7 RR |
98 | #define num_online_cpus() cpumask_weight(cpu_online_mask) |
99 | #define num_possible_cpus() cpumask_weight(cpu_possible_mask) | |
100 | #define num_present_cpus() cpumask_weight(cpu_present_mask) | |
6ad4c188 | 101 | #define num_active_cpus() cpumask_weight(cpu_active_mask) |
ae7a47e7 RR |
102 | #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) |
103 | #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) | |
104 | #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) | |
105 | #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) | |
1da177e4 | 106 | #else |
221e3ebf HC |
107 | #define num_online_cpus() 1U |
108 | #define num_possible_cpus() 1U | |
109 | #define num_present_cpus() 1U | |
110 | #define num_active_cpus() 1U | |
1da177e4 LT |
111 | #define cpu_online(cpu) ((cpu) == 0) |
112 | #define cpu_possible(cpu) ((cpu) == 0) | |
113 | #define cpu_present(cpu) ((cpu) == 0) | |
e761b772 | 114 | #define cpu_active(cpu) ((cpu) == 0) |
1da177e4 LT |
115 | #endif |
116 | ||
2d3854a3 RR |
117 | /* verify cpu argument to cpumask_* operators */ |
118 | static inline unsigned int cpumask_check(unsigned int cpu) | |
119 | { | |
120 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
121 | WARN_ON_ONCE(cpu >= nr_cpumask_bits); | |
122 | #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ | |
123 | return cpu; | |
124 | } | |
125 | ||
126 | #if NR_CPUS == 1 | |
984f2f37 RR |
127 | /* Uniprocessor. Assume all masks are "1". */ |
128 | static inline unsigned int cpumask_first(const struct cpumask *srcp) | |
129 | { | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* Valid inputs for n are -1 and 0. */ | |
134 | static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) | |
135 | { | |
136 | return n+1; | |
137 | } | |
138 | ||
139 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) | |
140 | { | |
141 | return n+1; | |
142 | } | |
143 | ||
144 | static inline unsigned int cpumask_next_and(int n, | |
145 | const struct cpumask *srcp, | |
146 | const struct cpumask *andp) | |
147 | { | |
148 | return n+1; | |
149 | } | |
150 | ||
151 | /* cpu must be a valid cpu, ie 0, so there's no other choice. */ | |
152 | static inline unsigned int cpumask_any_but(const struct cpumask *mask, | |
153 | unsigned int cpu) | |
154 | { | |
155 | return 1; | |
156 | } | |
2d3854a3 | 157 | |
f36963c9 | 158 | static inline unsigned int cpumask_local_spread(unsigned int i, int node) |
da91309e | 159 | { |
da91309e AV |
160 | return 0; |
161 | } | |
162 | ||
2d3854a3 RR |
163 | #define for_each_cpu(cpu, mask) \ |
164 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) | |
8bd93a2c PM |
165 | #define for_each_cpu_not(cpu, mask) \ |
166 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) | |
2d3854a3 RR |
167 | #define for_each_cpu_and(cpu, mask, and) \ |
168 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) | |
169 | #else | |
170 | /** | |
171 | * cpumask_first - get the first cpu in a cpumask | |
172 | * @srcp: the cpumask pointer | |
173 | * | |
174 | * Returns >= nr_cpu_ids if no cpus set. | |
175 | */ | |
176 | static inline unsigned int cpumask_first(const struct cpumask *srcp) | |
177 | { | |
178 | return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); | |
179 | } | |
180 | ||
181 | /** | |
182 | * cpumask_next - get the next cpu in a cpumask | |
183 | * @n: the cpu prior to the place to search (ie. return will be > @n) | |
184 | * @srcp: the cpumask pointer | |
185 | * | |
186 | * Returns >= nr_cpu_ids if no further cpus set. | |
187 | */ | |
188 | static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) | |
189 | { | |
190 | /* -1 is a legal arg here. */ | |
191 | if (n != -1) | |
192 | cpumask_check(n); | |
193 | return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); | |
194 | } | |
195 | ||
196 | /** | |
197 | * cpumask_next_zero - get the next unset cpu in a cpumask | |
198 | * @n: the cpu prior to the place to search (ie. return will be > @n) | |
199 | * @srcp: the cpumask pointer | |
200 | * | |
201 | * Returns >= nr_cpu_ids if no further cpus unset. | |
202 | */ | |
203 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) | |
204 | { | |
205 | /* -1 is a legal arg here. */ | |
206 | if (n != -1) | |
207 | cpumask_check(n); | |
208 | return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); | |
209 | } | |
210 | ||
211 | int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); | |
212 | int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); | |
f36963c9 | 213 | unsigned int cpumask_local_spread(unsigned int i, int node); |
2d3854a3 | 214 | |
984f2f37 RR |
215 | /** |
216 | * for_each_cpu - iterate over every cpu in a mask | |
217 | * @cpu: the (optionally unsigned) integer iterator | |
218 | * @mask: the cpumask pointer | |
219 | * | |
220 | * After the loop, cpu is >= nr_cpu_ids. | |
221 | */ | |
2d3854a3 RR |
222 | #define for_each_cpu(cpu, mask) \ |
223 | for ((cpu) = -1; \ | |
224 | (cpu) = cpumask_next((cpu), (mask)), \ | |
225 | (cpu) < nr_cpu_ids;) | |
984f2f37 | 226 | |
8bd93a2c PM |
227 | /** |
228 | * for_each_cpu_not - iterate over every cpu in a complemented mask | |
229 | * @cpu: the (optionally unsigned) integer iterator | |
230 | * @mask: the cpumask pointer | |
231 | * | |
232 | * After the loop, cpu is >= nr_cpu_ids. | |
233 | */ | |
234 | #define for_each_cpu_not(cpu, mask) \ | |
235 | for ((cpu) = -1; \ | |
236 | (cpu) = cpumask_next_zero((cpu), (mask)), \ | |
237 | (cpu) < nr_cpu_ids;) | |
238 | ||
984f2f37 RR |
239 | /** |
240 | * for_each_cpu_and - iterate over every cpu in both masks | |
241 | * @cpu: the (optionally unsigned) integer iterator | |
242 | * @mask: the first cpumask pointer | |
243 | * @and: the second cpumask pointer | |
244 | * | |
245 | * This saves a temporary CPU mask in many places. It is equivalent to: | |
246 | * struct cpumask tmp; | |
247 | * cpumask_and(&tmp, &mask, &and); | |
248 | * for_each_cpu(cpu, &tmp) | |
249 | * ... | |
250 | * | |
251 | * After the loop, cpu is >= nr_cpu_ids. | |
252 | */ | |
2d3854a3 RR |
253 | #define for_each_cpu_and(cpu, mask, and) \ |
254 | for ((cpu) = -1; \ | |
255 | (cpu) = cpumask_next_and((cpu), (mask), (and)), \ | |
256 | (cpu) < nr_cpu_ids;) | |
257 | #endif /* SMP */ | |
258 | ||
259 | #define CPU_BITS_NONE \ | |
260 | { \ | |
261 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ | |
262 | } | |
263 | ||
264 | #define CPU_BITS_CPU0 \ | |
265 | { \ | |
266 | [0] = 1UL \ | |
267 | } | |
268 | ||
269 | /** | |
270 | * cpumask_set_cpu - set a cpu in a cpumask | |
271 | * @cpu: cpu number (< nr_cpu_ids) | |
272 | * @dstp: the cpumask pointer | |
273 | */ | |
274 | static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) | |
275 | { | |
276 | set_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
277 | } | |
278 | ||
279 | /** | |
280 | * cpumask_clear_cpu - clear a cpu in a cpumask | |
281 | * @cpu: cpu number (< nr_cpu_ids) | |
282 | * @dstp: the cpumask pointer | |
283 | */ | |
284 | static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) | |
285 | { | |
286 | clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
287 | } | |
288 | ||
289 | /** | |
290 | * cpumask_test_cpu - test for a cpu in a cpumask | |
291 | * @cpu: cpu number (< nr_cpu_ids) | |
292 | * @cpumask: the cpumask pointer | |
293 | * | |
c777ad69 | 294 | * Returns 1 if @cpu is set in @cpumask, else returns 0 |
2d3854a3 | 295 | */ |
3bbf7f46 RV |
296 | static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask) |
297 | { | |
298 | return test_bit(cpumask_check(cpu), cpumask_bits((cpumask))); | |
299 | } | |
2d3854a3 RR |
300 | |
301 | /** | |
302 | * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask | |
303 | * @cpu: cpu number (< nr_cpu_ids) | |
304 | * @cpumask: the cpumask pointer | |
305 | * | |
c777ad69 AS |
306 | * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 |
307 | * | |
2d3854a3 RR |
308 | * test_and_set_bit wrapper for cpumasks. |
309 | */ | |
310 | static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) | |
311 | { | |
312 | return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); | |
313 | } | |
314 | ||
54fdade1 XG |
315 | /** |
316 | * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask | |
317 | * @cpu: cpu number (< nr_cpu_ids) | |
318 | * @cpumask: the cpumask pointer | |
319 | * | |
c777ad69 AS |
320 | * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 |
321 | * | |
54fdade1 XG |
322 | * test_and_clear_bit wrapper for cpumasks. |
323 | */ | |
324 | static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) | |
325 | { | |
326 | return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); | |
327 | } | |
328 | ||
2d3854a3 RR |
329 | /** |
330 | * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask | |
331 | * @dstp: the cpumask pointer | |
332 | */ | |
333 | static inline void cpumask_setall(struct cpumask *dstp) | |
334 | { | |
335 | bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); | |
336 | } | |
337 | ||
338 | /** | |
339 | * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask | |
340 | * @dstp: the cpumask pointer | |
341 | */ | |
342 | static inline void cpumask_clear(struct cpumask *dstp) | |
343 | { | |
344 | bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); | |
345 | } | |
346 | ||
347 | /** | |
348 | * cpumask_and - *dstp = *src1p & *src2p | |
349 | * @dstp: the cpumask result | |
350 | * @src1p: the first input | |
351 | * @src2p: the second input | |
c777ad69 AS |
352 | * |
353 | * If *@dstp is empty, returns 0, else returns 1 | |
2d3854a3 | 354 | */ |
f4b0373b | 355 | static inline int cpumask_and(struct cpumask *dstp, |
2d3854a3 RR |
356 | const struct cpumask *src1p, |
357 | const struct cpumask *src2p) | |
358 | { | |
f4b0373b | 359 | return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), |
2d3854a3 RR |
360 | cpumask_bits(src2p), nr_cpumask_bits); |
361 | } | |
362 | ||
363 | /** | |
364 | * cpumask_or - *dstp = *src1p | *src2p | |
365 | * @dstp: the cpumask result | |
366 | * @src1p: the first input | |
367 | * @src2p: the second input | |
368 | */ | |
369 | static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, | |
370 | const struct cpumask *src2p) | |
371 | { | |
372 | bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), | |
373 | cpumask_bits(src2p), nr_cpumask_bits); | |
374 | } | |
375 | ||
376 | /** | |
377 | * cpumask_xor - *dstp = *src1p ^ *src2p | |
378 | * @dstp: the cpumask result | |
379 | * @src1p: the first input | |
380 | * @src2p: the second input | |
381 | */ | |
382 | static inline void cpumask_xor(struct cpumask *dstp, | |
383 | const struct cpumask *src1p, | |
384 | const struct cpumask *src2p) | |
385 | { | |
386 | bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), | |
387 | cpumask_bits(src2p), nr_cpumask_bits); | |
388 | } | |
389 | ||
390 | /** | |
391 | * cpumask_andnot - *dstp = *src1p & ~*src2p | |
392 | * @dstp: the cpumask result | |
393 | * @src1p: the first input | |
394 | * @src2p: the second input | |
c777ad69 AS |
395 | * |
396 | * If *@dstp is empty, returns 0, else returns 1 | |
2d3854a3 | 397 | */ |
f4b0373b | 398 | static inline int cpumask_andnot(struct cpumask *dstp, |
2d3854a3 RR |
399 | const struct cpumask *src1p, |
400 | const struct cpumask *src2p) | |
401 | { | |
f4b0373b | 402 | return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), |
2d3854a3 RR |
403 | cpumask_bits(src2p), nr_cpumask_bits); |
404 | } | |
405 | ||
406 | /** | |
407 | * cpumask_complement - *dstp = ~*srcp | |
408 | * @dstp: the cpumask result | |
409 | * @srcp: the input to invert | |
410 | */ | |
411 | static inline void cpumask_complement(struct cpumask *dstp, | |
412 | const struct cpumask *srcp) | |
413 | { | |
414 | bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), | |
415 | nr_cpumask_bits); | |
416 | } | |
417 | ||
418 | /** | |
419 | * cpumask_equal - *src1p == *src2p | |
420 | * @src1p: the first input | |
421 | * @src2p: the second input | |
422 | */ | |
423 | static inline bool cpumask_equal(const struct cpumask *src1p, | |
424 | const struct cpumask *src2p) | |
425 | { | |
426 | return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), | |
427 | nr_cpumask_bits); | |
428 | } | |
429 | ||
430 | /** | |
431 | * cpumask_intersects - (*src1p & *src2p) != 0 | |
432 | * @src1p: the first input | |
433 | * @src2p: the second input | |
434 | */ | |
435 | static inline bool cpumask_intersects(const struct cpumask *src1p, | |
436 | const struct cpumask *src2p) | |
437 | { | |
438 | return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), | |
439 | nr_cpumask_bits); | |
440 | } | |
441 | ||
442 | /** | |
443 | * cpumask_subset - (*src1p & ~*src2p) == 0 | |
444 | * @src1p: the first input | |
445 | * @src2p: the second input | |
c777ad69 AS |
446 | * |
447 | * Returns 1 if *@src1p is a subset of *@src2p, else returns 0 | |
2d3854a3 RR |
448 | */ |
449 | static inline int cpumask_subset(const struct cpumask *src1p, | |
450 | const struct cpumask *src2p) | |
451 | { | |
452 | return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), | |
453 | nr_cpumask_bits); | |
454 | } | |
455 | ||
456 | /** | |
457 | * cpumask_empty - *srcp == 0 | |
458 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. | |
459 | */ | |
460 | static inline bool cpumask_empty(const struct cpumask *srcp) | |
461 | { | |
462 | return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); | |
463 | } | |
464 | ||
465 | /** | |
466 | * cpumask_full - *srcp == 0xFFFFFFFF... | |
467 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. | |
468 | */ | |
469 | static inline bool cpumask_full(const struct cpumask *srcp) | |
470 | { | |
471 | return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); | |
472 | } | |
473 | ||
474 | /** | |
475 | * cpumask_weight - Count of bits in *srcp | |
476 | * @srcp: the cpumask to count bits (< nr_cpu_ids) in. | |
477 | */ | |
478 | static inline unsigned int cpumask_weight(const struct cpumask *srcp) | |
479 | { | |
480 | return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); | |
481 | } | |
482 | ||
483 | /** | |
484 | * cpumask_shift_right - *dstp = *srcp >> n | |
485 | * @dstp: the cpumask result | |
486 | * @srcp: the input to shift | |
487 | * @n: the number of bits to shift by | |
488 | */ | |
489 | static inline void cpumask_shift_right(struct cpumask *dstp, | |
490 | const struct cpumask *srcp, int n) | |
491 | { | |
492 | bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, | |
493 | nr_cpumask_bits); | |
494 | } | |
495 | ||
496 | /** | |
497 | * cpumask_shift_left - *dstp = *srcp << n | |
498 | * @dstp: the cpumask result | |
499 | * @srcp: the input to shift | |
500 | * @n: the number of bits to shift by | |
501 | */ | |
502 | static inline void cpumask_shift_left(struct cpumask *dstp, | |
503 | const struct cpumask *srcp, int n) | |
504 | { | |
505 | bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, | |
506 | nr_cpumask_bits); | |
507 | } | |
508 | ||
509 | /** | |
510 | * cpumask_copy - *dstp = *srcp | |
511 | * @dstp: the result | |
512 | * @srcp: the input cpumask | |
513 | */ | |
514 | static inline void cpumask_copy(struct cpumask *dstp, | |
515 | const struct cpumask *srcp) | |
516 | { | |
517 | bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); | |
518 | } | |
519 | ||
520 | /** | |
521 | * cpumask_any - pick a "random" cpu from *srcp | |
522 | * @srcp: the input cpumask | |
523 | * | |
524 | * Returns >= nr_cpu_ids if no cpus set. | |
525 | */ | |
526 | #define cpumask_any(srcp) cpumask_first(srcp) | |
527 | ||
528 | /** | |
529 | * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 | |
530 | * @src1p: the first input | |
531 | * @src2p: the second input | |
532 | * | |
533 | * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). | |
534 | */ | |
535 | #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) | |
536 | ||
537 | /** | |
538 | * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 | |
539 | * @mask1: the first input cpumask | |
540 | * @mask2: the second input cpumask | |
541 | * | |
542 | * Returns >= nr_cpu_ids if no cpus set. | |
543 | */ | |
544 | #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) | |
545 | ||
cd83e42c RR |
546 | /** |
547 | * cpumask_of - the cpumask containing just a given cpu | |
548 | * @cpu: the cpu (<= nr_cpu_ids) | |
549 | */ | |
550 | #define cpumask_of(cpu) (get_cpu_mask(cpu)) | |
551 | ||
29c0177e RR |
552 | /** |
553 | * cpumask_parse_user - extract a cpumask from a user string | |
554 | * @buf: the buffer to extract from | |
555 | * @len: the length of the buffer | |
556 | * @dstp: the cpumask to set. | |
557 | * | |
558 | * Returns -errno, or 0 for success. | |
559 | */ | |
560 | static inline int cpumask_parse_user(const char __user *buf, int len, | |
561 | struct cpumask *dstp) | |
562 | { | |
513e3d2d | 563 | return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpu_ids); |
29c0177e RR |
564 | } |
565 | ||
4b060420 MT |
566 | /** |
567 | * cpumask_parselist_user - extract a cpumask from a user string | |
568 | * @buf: the buffer to extract from | |
569 | * @len: the length of the buffer | |
570 | * @dstp: the cpumask to set. | |
571 | * | |
572 | * Returns -errno, or 0 for success. | |
573 | */ | |
574 | static inline int cpumask_parselist_user(const char __user *buf, int len, | |
575 | struct cpumask *dstp) | |
576 | { | |
577 | return bitmap_parselist_user(buf, len, cpumask_bits(dstp), | |
513e3d2d | 578 | nr_cpu_ids); |
4b060420 MT |
579 | } |
580 | ||
ba630e49 TH |
581 | /** |
582 | * cpumask_parse - extract a cpumask from from a string | |
583 | * @buf: the buffer to extract from | |
584 | * @dstp: the cpumask to set. | |
585 | * | |
586 | * Returns -errno, or 0 for success. | |
587 | */ | |
588 | static inline int cpumask_parse(const char *buf, struct cpumask *dstp) | |
589 | { | |
590 | char *nl = strchr(buf, '\n'); | |
cea092c9 | 591 | unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf); |
ba630e49 | 592 | |
513e3d2d | 593 | return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpu_ids); |
ba630e49 TH |
594 | } |
595 | ||
29c0177e | 596 | /** |
231daf07 | 597 | * cpulist_parse - extract a cpumask from a user string of ranges |
29c0177e | 598 | * @buf: the buffer to extract from |
29c0177e RR |
599 | * @dstp: the cpumask to set. |
600 | * | |
601 | * Returns -errno, or 0 for success. | |
602 | */ | |
603 | static inline int cpulist_parse(const char *buf, struct cpumask *dstp) | |
604 | { | |
513e3d2d | 605 | return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpu_ids); |
2d3854a3 RR |
606 | } |
607 | ||
608 | /** | |
609 | * cpumask_size - size to allocate for a 'struct cpumask' in bytes | |
610 | * | |
611 | * This will eventually be a runtime variable, depending on nr_cpu_ids. | |
612 | */ | |
613 | static inline size_t cpumask_size(void) | |
614 | { | |
cdfdef75 | 615 | return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); |
2d3854a3 RR |
616 | } |
617 | ||
618 | /* | |
619 | * cpumask_var_t: struct cpumask for stack usage. | |
620 | * | |
621 | * Oh, the wicked games we play! In order to make kernel coding a | |
622 | * little more difficult, we typedef cpumask_var_t to an array or a | |
623 | * pointer: doing &mask on an array is a noop, so it still works. | |
624 | * | |
625 | * ie. | |
626 | * cpumask_var_t tmpmask; | |
627 | * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
628 | * return -ENOMEM; | |
629 | * | |
630 | * ... use 'tmpmask' like a normal struct cpumask * ... | |
631 | * | |
632 | * free_cpumask_var(tmpmask); | |
a64a26e8 KM |
633 | * |
634 | * | |
635 | * However, one notable exception is there. alloc_cpumask_var() allocates | |
636 | * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has | |
637 | * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t. | |
638 | * | |
639 | * cpumask_var_t tmpmask; | |
640 | * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
641 | * return -ENOMEM; | |
642 | * | |
643 | * var = *tmpmask; | |
644 | * | |
645 | * This code makes NR_CPUS length memcopy and brings to a memory corruption. | |
646 | * cpumask_copy() provide safe copy functionality. | |
4ba29684 CL |
647 | * |
648 | * Note that there is another evil here: If you define a cpumask_var_t | |
649 | * as a percpu variable then the way to obtain the address of the cpumask | |
650 | * structure differently influences what this_cpu_* operation needs to be | |
651 | * used. Please use this_cpu_cpumask_var_t in those cases. The direct use | |
652 | * of this_cpu_ptr() or this_cpu_read() will lead to failures when the | |
653 | * other type of cpumask_var_t implementation is configured. | |
2d3854a3 RR |
654 | */ |
655 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
656 | typedef struct cpumask *cpumask_var_t; | |
657 | ||
4ba29684 CL |
658 | #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) |
659 | ||
7b4967c5 | 660 | bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
2d3854a3 | 661 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); |
0281b5dc YL |
662 | bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
663 | bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); | |
2d3854a3 RR |
664 | void alloc_bootmem_cpumask_var(cpumask_var_t *mask); |
665 | void free_cpumask_var(cpumask_var_t mask); | |
cd83e42c | 666 | void free_bootmem_cpumask_var(cpumask_var_t mask); |
2d3854a3 RR |
667 | |
668 | #else | |
669 | typedef struct cpumask cpumask_var_t[1]; | |
670 | ||
4ba29684 CL |
671 | #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) |
672 | ||
2d3854a3 RR |
673 | static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
674 | { | |
675 | return true; | |
676 | } | |
677 | ||
7b4967c5 MT |
678 | static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, |
679 | int node) | |
680 | { | |
681 | return true; | |
682 | } | |
683 | ||
0281b5dc YL |
684 | static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
685 | { | |
686 | cpumask_clear(*mask); | |
687 | return true; | |
688 | } | |
689 | ||
690 | static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, | |
691 | int node) | |
692 | { | |
693 | cpumask_clear(*mask); | |
694 | return true; | |
695 | } | |
696 | ||
2d3854a3 RR |
697 | static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
698 | { | |
699 | } | |
700 | ||
701 | static inline void free_cpumask_var(cpumask_var_t mask) | |
702 | { | |
703 | } | |
cd83e42c RR |
704 | |
705 | static inline void free_bootmem_cpumask_var(cpumask_var_t mask) | |
706 | { | |
707 | } | |
2d3854a3 RR |
708 | #endif /* CONFIG_CPUMASK_OFFSTACK */ |
709 | ||
2d3854a3 RR |
710 | /* It's common to want to use cpu_all_mask in struct member initializers, |
711 | * so it has to refer to an address rather than a pointer. */ | |
712 | extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); | |
713 | #define cpu_all_mask to_cpumask(cpu_all_bits) | |
714 | ||
715 | /* First bits of cpu_bit_bitmap are in fact unset. */ | |
716 | #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) | |
717 | ||
ae7a47e7 RR |
718 | #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) |
719 | #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) | |
720 | #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) | |
721 | ||
2d3854a3 | 722 | /* Wrappers for arch boot code to manipulate normally-constant masks */ |
3fa41520 RR |
723 | void init_cpu_present(const struct cpumask *src); |
724 | void init_cpu_possible(const struct cpumask *src); | |
725 | void init_cpu_online(const struct cpumask *src); | |
6ba2ef7b | 726 | |
9425676a RV |
727 | static inline void |
728 | set_cpu_possible(unsigned int cpu, bool possible) | |
729 | { | |
730 | if (possible) | |
731 | cpumask_set_cpu(cpu, &__cpu_possible_mask); | |
732 | else | |
733 | cpumask_clear_cpu(cpu, &__cpu_possible_mask); | |
734 | } | |
735 | ||
736 | static inline void | |
737 | set_cpu_present(unsigned int cpu, bool present) | |
738 | { | |
739 | if (present) | |
740 | cpumask_set_cpu(cpu, &__cpu_present_mask); | |
741 | else | |
742 | cpumask_clear_cpu(cpu, &__cpu_present_mask); | |
743 | } | |
744 | ||
745 | static inline void | |
746 | set_cpu_online(unsigned int cpu, bool online) | |
747 | { | |
748 | if (online) { | |
749 | cpumask_set_cpu(cpu, &__cpu_online_mask); | |
750 | cpumask_set_cpu(cpu, &__cpu_active_mask); | |
751 | } else { | |
752 | cpumask_clear_cpu(cpu, &__cpu_online_mask); | |
753 | } | |
754 | } | |
755 | ||
756 | static inline void | |
757 | set_cpu_active(unsigned int cpu, bool active) | |
758 | { | |
759 | if (active) | |
760 | cpumask_set_cpu(cpu, &__cpu_active_mask); | |
761 | else | |
762 | cpumask_clear_cpu(cpu, &__cpu_active_mask); | |
763 | } | |
764 | ||
765 | ||
6ba2ef7b RR |
766 | /** |
767 | * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * | |
768 | * @bitmap: the bitmap | |
769 | * | |
770 | * There are a few places where cpumask_var_t isn't appropriate and | |
771 | * static cpumasks must be used (eg. very early boot), yet we don't | |
772 | * expose the definition of 'struct cpumask'. | |
773 | * | |
774 | * This does the conversion, and can be used as a constant initializer. | |
775 | */ | |
776 | #define to_cpumask(bitmap) \ | |
777 | ((struct cpumask *)(1 ? (bitmap) \ | |
778 | : (void *)sizeof(__check_is_bitmap(bitmap)))) | |
779 | ||
780 | static inline int __check_is_bitmap(const unsigned long *bitmap) | |
781 | { | |
782 | return 1; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Special-case data structure for "single bit set only" constant CPU masks. | |
787 | * | |
788 | * We pre-generate all the 64 (or 32) possible bit positions, with enough | |
789 | * padding to the left and the right, and return the constant pointer | |
790 | * appropriately offset. | |
791 | */ | |
792 | extern const unsigned long | |
793 | cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; | |
794 | ||
795 | static inline const struct cpumask *get_cpu_mask(unsigned int cpu) | |
796 | { | |
797 | const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; | |
798 | p -= cpu / BITS_PER_LONG; | |
799 | return to_cpumask(p); | |
800 | } | |
801 | ||
802 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) | |
803 | ||
804 | #if NR_CPUS <= BITS_PER_LONG | |
805 | #define CPU_BITS_ALL \ | |
806 | { \ | |
9941a383 | 807 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b RR |
808 | } |
809 | ||
810 | #else /* NR_CPUS > BITS_PER_LONG */ | |
811 | ||
812 | #define CPU_BITS_ALL \ | |
813 | { \ | |
814 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ | |
9941a383 | 815 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b RR |
816 | } |
817 | #endif /* NR_CPUS > BITS_PER_LONG */ | |
818 | ||
5aaba363 SH |
819 | /** |
820 | * cpumap_print_to_pagebuf - copies the cpumask into the buffer either | |
821 | * as comma-separated list of cpus or hex values of cpumask | |
822 | * @list: indicates whether the cpumap must be list | |
823 | * @mask: the cpumask to copy | |
824 | * @buf: the buffer to copy into | |
825 | * | |
826 | * Returns the length of the (null-terminated) @buf string, zero if | |
827 | * nothing is copied. | |
828 | */ | |
829 | static inline ssize_t | |
830 | cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) | |
831 | { | |
832 | return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask), | |
513e3d2d | 833 | nr_cpu_ids); |
5aaba363 SH |
834 | } |
835 | ||
6ba2ef7b | 836 | #if NR_CPUS <= BITS_PER_LONG |
6ba2ef7b RR |
837 | #define CPU_MASK_ALL \ |
838 | (cpumask_t) { { \ | |
9941a383 | 839 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b | 840 | } } |
6ba2ef7b | 841 | #else |
6ba2ef7b RR |
842 | #define CPU_MASK_ALL \ |
843 | (cpumask_t) { { \ | |
844 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ | |
9941a383 | 845 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b | 846 | } } |
9941a383 | 847 | #endif /* NR_CPUS > BITS_PER_LONG */ |
6ba2ef7b RR |
848 | |
849 | #define CPU_MASK_NONE \ | |
850 | (cpumask_t) { { \ | |
851 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ | |
852 | } } | |
853 | ||
1527781d RR |
854 | #define CPU_MASK_CPU0 \ |
855 | (cpumask_t) { { \ | |
856 | [0] = 1UL \ | |
857 | } } | |
858 | ||
1da177e4 | 859 | #endif /* __LINUX_CPUMASK_H */ |