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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_CPUMASK_H |
3 | #define __LINUX_CPUMASK_H | |
4 | ||
5 | /* | |
6 | * Cpumasks provide a bitmap suitable for representing the | |
6ba2ef7b RR |
7 | * set of CPU's in a system, one bit position per CPU number. In general, |
8 | * only nr_cpu_ids (<= NR_CPUS) bits are valid. | |
1da177e4 | 9 | */ |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/threads.h> | |
12 | #include <linux/bitmap.h> | |
187f1882 | 13 | #include <linux/bug.h> |
1da177e4 | 14 | |
cdfdef75 | 15 | /* Don't assign or return these: may not be this big! */ |
2d3854a3 | 16 | typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; |
1da177e4 | 17 | |
ae7a47e7 | 18 | /** |
6ba2ef7b RR |
19 | * cpumask_bits - get the bits in a cpumask |
20 | * @maskp: the struct cpumask * | |
ae7a47e7 | 21 | * |
6ba2ef7b RR |
22 | * You should only assume nr_cpu_ids bits of this mask are valid. This is |
23 | * a macro so it's const-correct. | |
ae7a47e7 | 24 | */ |
6ba2ef7b | 25 | #define cpumask_bits(maskp) ((maskp)->bits) |
7ea931c9 | 26 | |
f1bbc032 TH |
27 | /** |
28 | * cpumask_pr_args - printf args to output a cpumask | |
29 | * @maskp: cpumask to be printed | |
30 | * | |
31 | * Can be used to provide arguments for '%*pb[l]' when printing a cpumask. | |
32 | */ | |
33 | #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp) | |
34 | ||
41df0d61 | 35 | #if NR_CPUS == 1 |
9b130ad5 | 36 | #define nr_cpu_ids 1U |
6ba2ef7b | 37 | #else |
9b130ad5 | 38 | extern unsigned int nr_cpu_ids; |
41df0d61 MT |
39 | #endif |
40 | ||
6ba2ef7b RR |
41 | #ifdef CONFIG_CPUMASK_OFFSTACK |
42 | /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also, | |
43 | * not all bits may be allocated. */ | |
9b130ad5 | 44 | #define nr_cpumask_bits nr_cpu_ids |
6ba2ef7b | 45 | #else |
c311c797 | 46 | #define nr_cpumask_bits ((unsigned int)NR_CPUS) |
6ba2ef7b | 47 | #endif |
1da177e4 LT |
48 | |
49 | /* | |
50 | * The following particular system cpumasks and operations manage | |
b3199c02 | 51 | * possible, present, active and online cpus. |
1da177e4 | 52 | * |
b3199c02 RR |
53 | * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable |
54 | * cpu_present_mask - has bit 'cpu' set iff cpu is populated | |
55 | * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler | |
56 | * cpu_active_mask - has bit 'cpu' set iff cpu available to migration | |
1da177e4 | 57 | * |
b3199c02 | 58 | * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. |
1da177e4 | 59 | * |
b3199c02 RR |
60 | * The cpu_possible_mask is fixed at boot time, as the set of CPU id's |
61 | * that it is possible might ever be plugged in at anytime during the | |
62 | * life of that system boot. The cpu_present_mask is dynamic(*), | |
63 | * representing which CPUs are currently plugged in. And | |
64 | * cpu_online_mask is the dynamic subset of cpu_present_mask, | |
65 | * indicating those CPUs available for scheduling. | |
66 | * | |
67 | * If HOTPLUG is enabled, then cpu_possible_mask is forced to have | |
1da177e4 LT |
68 | * all NR_CPUS bits set, otherwise it is just the set of CPUs that |
69 | * ACPI reports present at boot. | |
70 | * | |
b3199c02 | 71 | * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, |
1da177e4 | 72 | * depending on what ACPI reports as currently plugged in, otherwise |
b3199c02 | 73 | * cpu_present_mask is just a copy of cpu_possible_mask. |
1da177e4 | 74 | * |
b3199c02 RR |
75 | * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not |
76 | * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. | |
1da177e4 LT |
77 | * |
78 | * Subtleties: | |
79 | * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode | |
80 | * assumption that their single CPU is online. The UP | |
b3199c02 | 81 | * cpu_{online,possible,present}_masks are placebos. Changing them |
1da177e4 LT |
82 | * will have no useful affect on the following num_*_cpus() |
83 | * and cpu_*() macros in the UP case. This ugliness is a UP | |
84 | * optimization - don't waste any instructions or memory references | |
85 | * asking if you're online or how many CPUs there are if there is | |
86 | * only one CPU. | |
1da177e4 LT |
87 | */ |
88 | ||
4b804c85 RV |
89 | extern struct cpumask __cpu_possible_mask; |
90 | extern struct cpumask __cpu_online_mask; | |
91 | extern struct cpumask __cpu_present_mask; | |
92 | extern struct cpumask __cpu_active_mask; | |
5aec01b8 RV |
93 | #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask) |
94 | #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask) | |
95 | #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask) | |
96 | #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask) | |
b3199c02 | 97 | |
1da177e4 | 98 | #if NR_CPUS > 1 |
ae7a47e7 RR |
99 | #define num_online_cpus() cpumask_weight(cpu_online_mask) |
100 | #define num_possible_cpus() cpumask_weight(cpu_possible_mask) | |
101 | #define num_present_cpus() cpumask_weight(cpu_present_mask) | |
6ad4c188 | 102 | #define num_active_cpus() cpumask_weight(cpu_active_mask) |
ae7a47e7 RR |
103 | #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) |
104 | #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) | |
105 | #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) | |
106 | #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) | |
1da177e4 | 107 | #else |
221e3ebf HC |
108 | #define num_online_cpus() 1U |
109 | #define num_possible_cpus() 1U | |
110 | #define num_present_cpus() 1U | |
111 | #define num_active_cpus() 1U | |
1da177e4 LT |
112 | #define cpu_online(cpu) ((cpu) == 0) |
113 | #define cpu_possible(cpu) ((cpu) == 0) | |
114 | #define cpu_present(cpu) ((cpu) == 0) | |
e761b772 | 115 | #define cpu_active(cpu) ((cpu) == 0) |
1da177e4 LT |
116 | #endif |
117 | ||
2d3854a3 RR |
118 | /* verify cpu argument to cpumask_* operators */ |
119 | static inline unsigned int cpumask_check(unsigned int cpu) | |
120 | { | |
121 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
122 | WARN_ON_ONCE(cpu >= nr_cpumask_bits); | |
123 | #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ | |
124 | return cpu; | |
125 | } | |
126 | ||
127 | #if NR_CPUS == 1 | |
984f2f37 RR |
128 | /* Uniprocessor. Assume all masks are "1". */ |
129 | static inline unsigned int cpumask_first(const struct cpumask *srcp) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* Valid inputs for n are -1 and 0. */ | |
135 | static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) | |
136 | { | |
137 | return n+1; | |
138 | } | |
139 | ||
140 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) | |
141 | { | |
142 | return n+1; | |
143 | } | |
144 | ||
145 | static inline unsigned int cpumask_next_and(int n, | |
146 | const struct cpumask *srcp, | |
147 | const struct cpumask *andp) | |
148 | { | |
149 | return n+1; | |
150 | } | |
151 | ||
152 | /* cpu must be a valid cpu, ie 0, so there's no other choice. */ | |
153 | static inline unsigned int cpumask_any_but(const struct cpumask *mask, | |
154 | unsigned int cpu) | |
155 | { | |
156 | return 1; | |
157 | } | |
2d3854a3 | 158 | |
f36963c9 | 159 | static inline unsigned int cpumask_local_spread(unsigned int i, int node) |
da91309e | 160 | { |
da91309e AV |
161 | return 0; |
162 | } | |
163 | ||
2d3854a3 RR |
164 | #define for_each_cpu(cpu, mask) \ |
165 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) | |
8bd93a2c PM |
166 | #define for_each_cpu_not(cpu, mask) \ |
167 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) | |
2d3854a3 RR |
168 | #define for_each_cpu_and(cpu, mask, and) \ |
169 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) | |
170 | #else | |
171 | /** | |
172 | * cpumask_first - get the first cpu in a cpumask | |
173 | * @srcp: the cpumask pointer | |
174 | * | |
175 | * Returns >= nr_cpu_ids if no cpus set. | |
176 | */ | |
177 | static inline unsigned int cpumask_first(const struct cpumask *srcp) | |
178 | { | |
179 | return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); | |
180 | } | |
181 | ||
f22ef333 | 182 | unsigned int cpumask_next(int n, const struct cpumask *srcp); |
2d3854a3 RR |
183 | |
184 | /** | |
185 | * cpumask_next_zero - get the next unset cpu in a cpumask | |
186 | * @n: the cpu prior to the place to search (ie. return will be > @n) | |
187 | * @srcp: the cpumask pointer | |
188 | * | |
189 | * Returns >= nr_cpu_ids if no further cpus unset. | |
190 | */ | |
191 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) | |
192 | { | |
193 | /* -1 is a legal arg here. */ | |
194 | if (n != -1) | |
195 | cpumask_check(n); | |
196 | return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); | |
197 | } | |
198 | ||
199 | int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); | |
200 | int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); | |
f36963c9 | 201 | unsigned int cpumask_local_spread(unsigned int i, int node); |
2d3854a3 | 202 | |
984f2f37 RR |
203 | /** |
204 | * for_each_cpu - iterate over every cpu in a mask | |
205 | * @cpu: the (optionally unsigned) integer iterator | |
206 | * @mask: the cpumask pointer | |
207 | * | |
208 | * After the loop, cpu is >= nr_cpu_ids. | |
209 | */ | |
2d3854a3 RR |
210 | #define for_each_cpu(cpu, mask) \ |
211 | for ((cpu) = -1; \ | |
212 | (cpu) = cpumask_next((cpu), (mask)), \ | |
213 | (cpu) < nr_cpu_ids;) | |
984f2f37 | 214 | |
8bd93a2c PM |
215 | /** |
216 | * for_each_cpu_not - iterate over every cpu in a complemented mask | |
217 | * @cpu: the (optionally unsigned) integer iterator | |
218 | * @mask: the cpumask pointer | |
219 | * | |
220 | * After the loop, cpu is >= nr_cpu_ids. | |
221 | */ | |
222 | #define for_each_cpu_not(cpu, mask) \ | |
223 | for ((cpu) = -1; \ | |
224 | (cpu) = cpumask_next_zero((cpu), (mask)), \ | |
225 | (cpu) < nr_cpu_ids;) | |
226 | ||
c743f0a5 PZ |
227 | extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap); |
228 | ||
229 | /** | |
230 | * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location | |
231 | * @cpu: the (optionally unsigned) integer iterator | |
232 | * @mask: the cpumask poiter | |
233 | * @start: the start location | |
234 | * | |
235 | * The implementation does not assume any bit in @mask is set (including @start). | |
236 | * | |
237 | * After the loop, cpu is >= nr_cpu_ids. | |
238 | */ | |
239 | #define for_each_cpu_wrap(cpu, mask, start) \ | |
240 | for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \ | |
241 | (cpu) < nr_cpumask_bits; \ | |
242 | (cpu) = cpumask_next_wrap((cpu), (mask), (start), true)) | |
243 | ||
984f2f37 RR |
244 | /** |
245 | * for_each_cpu_and - iterate over every cpu in both masks | |
246 | * @cpu: the (optionally unsigned) integer iterator | |
247 | * @mask: the first cpumask pointer | |
248 | * @and: the second cpumask pointer | |
249 | * | |
250 | * This saves a temporary CPU mask in many places. It is equivalent to: | |
251 | * struct cpumask tmp; | |
252 | * cpumask_and(&tmp, &mask, &and); | |
253 | * for_each_cpu(cpu, &tmp) | |
254 | * ... | |
255 | * | |
256 | * After the loop, cpu is >= nr_cpu_ids. | |
257 | */ | |
2d3854a3 RR |
258 | #define for_each_cpu_and(cpu, mask, and) \ |
259 | for ((cpu) = -1; \ | |
260 | (cpu) = cpumask_next_and((cpu), (mask), (and)), \ | |
261 | (cpu) < nr_cpu_ids;) | |
262 | #endif /* SMP */ | |
263 | ||
264 | #define CPU_BITS_NONE \ | |
265 | { \ | |
266 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ | |
267 | } | |
268 | ||
269 | #define CPU_BITS_CPU0 \ | |
270 | { \ | |
271 | [0] = 1UL \ | |
272 | } | |
273 | ||
274 | /** | |
275 | * cpumask_set_cpu - set a cpu in a cpumask | |
276 | * @cpu: cpu number (< nr_cpu_ids) | |
277 | * @dstp: the cpumask pointer | |
278 | */ | |
279 | static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) | |
280 | { | |
281 | set_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
282 | } | |
283 | ||
6c8557bd PZ |
284 | static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) |
285 | { | |
286 | __set_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
287 | } | |
288 | ||
289 | ||
2d3854a3 RR |
290 | /** |
291 | * cpumask_clear_cpu - clear a cpu in a cpumask | |
292 | * @cpu: cpu number (< nr_cpu_ids) | |
293 | * @dstp: the cpumask pointer | |
294 | */ | |
295 | static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) | |
296 | { | |
297 | clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
298 | } | |
299 | ||
6c8557bd PZ |
300 | static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp) |
301 | { | |
302 | __clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); | |
303 | } | |
304 | ||
2d3854a3 RR |
305 | /** |
306 | * cpumask_test_cpu - test for a cpu in a cpumask | |
307 | * @cpu: cpu number (< nr_cpu_ids) | |
308 | * @cpumask: the cpumask pointer | |
309 | * | |
c777ad69 | 310 | * Returns 1 if @cpu is set in @cpumask, else returns 0 |
2d3854a3 | 311 | */ |
3bbf7f46 RV |
312 | static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask) |
313 | { | |
314 | return test_bit(cpumask_check(cpu), cpumask_bits((cpumask))); | |
315 | } | |
2d3854a3 RR |
316 | |
317 | /** | |
318 | * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask | |
319 | * @cpu: cpu number (< nr_cpu_ids) | |
320 | * @cpumask: the cpumask pointer | |
321 | * | |
c777ad69 AS |
322 | * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 |
323 | * | |
2d3854a3 RR |
324 | * test_and_set_bit wrapper for cpumasks. |
325 | */ | |
326 | static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) | |
327 | { | |
328 | return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); | |
329 | } | |
330 | ||
54fdade1 XG |
331 | /** |
332 | * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask | |
333 | * @cpu: cpu number (< nr_cpu_ids) | |
334 | * @cpumask: the cpumask pointer | |
335 | * | |
c777ad69 AS |
336 | * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 |
337 | * | |
54fdade1 XG |
338 | * test_and_clear_bit wrapper for cpumasks. |
339 | */ | |
340 | static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) | |
341 | { | |
342 | return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); | |
343 | } | |
344 | ||
2d3854a3 RR |
345 | /** |
346 | * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask | |
347 | * @dstp: the cpumask pointer | |
348 | */ | |
349 | static inline void cpumask_setall(struct cpumask *dstp) | |
350 | { | |
351 | bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); | |
352 | } | |
353 | ||
354 | /** | |
355 | * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask | |
356 | * @dstp: the cpumask pointer | |
357 | */ | |
358 | static inline void cpumask_clear(struct cpumask *dstp) | |
359 | { | |
360 | bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); | |
361 | } | |
362 | ||
363 | /** | |
364 | * cpumask_and - *dstp = *src1p & *src2p | |
365 | * @dstp: the cpumask result | |
366 | * @src1p: the first input | |
367 | * @src2p: the second input | |
c777ad69 AS |
368 | * |
369 | * If *@dstp is empty, returns 0, else returns 1 | |
2d3854a3 | 370 | */ |
f4b0373b | 371 | static inline int cpumask_and(struct cpumask *dstp, |
2d3854a3 RR |
372 | const struct cpumask *src1p, |
373 | const struct cpumask *src2p) | |
374 | { | |
f4b0373b | 375 | return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), |
2d3854a3 RR |
376 | cpumask_bits(src2p), nr_cpumask_bits); |
377 | } | |
378 | ||
379 | /** | |
380 | * cpumask_or - *dstp = *src1p | *src2p | |
381 | * @dstp: the cpumask result | |
382 | * @src1p: the first input | |
383 | * @src2p: the second input | |
384 | */ | |
385 | static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, | |
386 | const struct cpumask *src2p) | |
387 | { | |
388 | bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), | |
389 | cpumask_bits(src2p), nr_cpumask_bits); | |
390 | } | |
391 | ||
392 | /** | |
393 | * cpumask_xor - *dstp = *src1p ^ *src2p | |
394 | * @dstp: the cpumask result | |
395 | * @src1p: the first input | |
396 | * @src2p: the second input | |
397 | */ | |
398 | static inline void cpumask_xor(struct cpumask *dstp, | |
399 | const struct cpumask *src1p, | |
400 | const struct cpumask *src2p) | |
401 | { | |
402 | bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), | |
403 | cpumask_bits(src2p), nr_cpumask_bits); | |
404 | } | |
405 | ||
406 | /** | |
407 | * cpumask_andnot - *dstp = *src1p & ~*src2p | |
408 | * @dstp: the cpumask result | |
409 | * @src1p: the first input | |
410 | * @src2p: the second input | |
c777ad69 AS |
411 | * |
412 | * If *@dstp is empty, returns 0, else returns 1 | |
2d3854a3 | 413 | */ |
f4b0373b | 414 | static inline int cpumask_andnot(struct cpumask *dstp, |
2d3854a3 RR |
415 | const struct cpumask *src1p, |
416 | const struct cpumask *src2p) | |
417 | { | |
f4b0373b | 418 | return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), |
2d3854a3 RR |
419 | cpumask_bits(src2p), nr_cpumask_bits); |
420 | } | |
421 | ||
422 | /** | |
423 | * cpumask_complement - *dstp = ~*srcp | |
424 | * @dstp: the cpumask result | |
425 | * @srcp: the input to invert | |
426 | */ | |
427 | static inline void cpumask_complement(struct cpumask *dstp, | |
428 | const struct cpumask *srcp) | |
429 | { | |
430 | bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), | |
431 | nr_cpumask_bits); | |
432 | } | |
433 | ||
434 | /** | |
435 | * cpumask_equal - *src1p == *src2p | |
436 | * @src1p: the first input | |
437 | * @src2p: the second input | |
438 | */ | |
439 | static inline bool cpumask_equal(const struct cpumask *src1p, | |
440 | const struct cpumask *src2p) | |
441 | { | |
442 | return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), | |
443 | nr_cpumask_bits); | |
444 | } | |
445 | ||
446 | /** | |
447 | * cpumask_intersects - (*src1p & *src2p) != 0 | |
448 | * @src1p: the first input | |
449 | * @src2p: the second input | |
450 | */ | |
451 | static inline bool cpumask_intersects(const struct cpumask *src1p, | |
452 | const struct cpumask *src2p) | |
453 | { | |
454 | return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), | |
455 | nr_cpumask_bits); | |
456 | } | |
457 | ||
458 | /** | |
459 | * cpumask_subset - (*src1p & ~*src2p) == 0 | |
460 | * @src1p: the first input | |
461 | * @src2p: the second input | |
c777ad69 AS |
462 | * |
463 | * Returns 1 if *@src1p is a subset of *@src2p, else returns 0 | |
2d3854a3 RR |
464 | */ |
465 | static inline int cpumask_subset(const struct cpumask *src1p, | |
466 | const struct cpumask *src2p) | |
467 | { | |
468 | return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), | |
469 | nr_cpumask_bits); | |
470 | } | |
471 | ||
472 | /** | |
473 | * cpumask_empty - *srcp == 0 | |
474 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. | |
475 | */ | |
476 | static inline bool cpumask_empty(const struct cpumask *srcp) | |
477 | { | |
478 | return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); | |
479 | } | |
480 | ||
481 | /** | |
482 | * cpumask_full - *srcp == 0xFFFFFFFF... | |
483 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. | |
484 | */ | |
485 | static inline bool cpumask_full(const struct cpumask *srcp) | |
486 | { | |
487 | return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); | |
488 | } | |
489 | ||
490 | /** | |
491 | * cpumask_weight - Count of bits in *srcp | |
492 | * @srcp: the cpumask to count bits (< nr_cpu_ids) in. | |
493 | */ | |
494 | static inline unsigned int cpumask_weight(const struct cpumask *srcp) | |
495 | { | |
496 | return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); | |
497 | } | |
498 | ||
499 | /** | |
500 | * cpumask_shift_right - *dstp = *srcp >> n | |
501 | * @dstp: the cpumask result | |
502 | * @srcp: the input to shift | |
503 | * @n: the number of bits to shift by | |
504 | */ | |
505 | static inline void cpumask_shift_right(struct cpumask *dstp, | |
506 | const struct cpumask *srcp, int n) | |
507 | { | |
508 | bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, | |
509 | nr_cpumask_bits); | |
510 | } | |
511 | ||
512 | /** | |
513 | * cpumask_shift_left - *dstp = *srcp << n | |
514 | * @dstp: the cpumask result | |
515 | * @srcp: the input to shift | |
516 | * @n: the number of bits to shift by | |
517 | */ | |
518 | static inline void cpumask_shift_left(struct cpumask *dstp, | |
519 | const struct cpumask *srcp, int n) | |
520 | { | |
521 | bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, | |
522 | nr_cpumask_bits); | |
523 | } | |
524 | ||
525 | /** | |
526 | * cpumask_copy - *dstp = *srcp | |
527 | * @dstp: the result | |
528 | * @srcp: the input cpumask | |
529 | */ | |
530 | static inline void cpumask_copy(struct cpumask *dstp, | |
531 | const struct cpumask *srcp) | |
532 | { | |
533 | bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); | |
534 | } | |
535 | ||
536 | /** | |
537 | * cpumask_any - pick a "random" cpu from *srcp | |
538 | * @srcp: the input cpumask | |
539 | * | |
540 | * Returns >= nr_cpu_ids if no cpus set. | |
541 | */ | |
542 | #define cpumask_any(srcp) cpumask_first(srcp) | |
543 | ||
544 | /** | |
545 | * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 | |
546 | * @src1p: the first input | |
547 | * @src2p: the second input | |
548 | * | |
549 | * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). | |
550 | */ | |
551 | #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) | |
552 | ||
553 | /** | |
554 | * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 | |
555 | * @mask1: the first input cpumask | |
556 | * @mask2: the second input cpumask | |
557 | * | |
558 | * Returns >= nr_cpu_ids if no cpus set. | |
559 | */ | |
560 | #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) | |
561 | ||
cd83e42c RR |
562 | /** |
563 | * cpumask_of - the cpumask containing just a given cpu | |
564 | * @cpu: the cpu (<= nr_cpu_ids) | |
565 | */ | |
566 | #define cpumask_of(cpu) (get_cpu_mask(cpu)) | |
567 | ||
29c0177e RR |
568 | /** |
569 | * cpumask_parse_user - extract a cpumask from a user string | |
570 | * @buf: the buffer to extract from | |
571 | * @len: the length of the buffer | |
572 | * @dstp: the cpumask to set. | |
573 | * | |
574 | * Returns -errno, or 0 for success. | |
575 | */ | |
576 | static inline int cpumask_parse_user(const char __user *buf, int len, | |
577 | struct cpumask *dstp) | |
578 | { | |
4d59b6cc | 579 | return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); |
29c0177e RR |
580 | } |
581 | ||
4b060420 MT |
582 | /** |
583 | * cpumask_parselist_user - extract a cpumask from a user string | |
584 | * @buf: the buffer to extract from | |
585 | * @len: the length of the buffer | |
586 | * @dstp: the cpumask to set. | |
587 | * | |
588 | * Returns -errno, or 0 for success. | |
589 | */ | |
590 | static inline int cpumask_parselist_user(const char __user *buf, int len, | |
591 | struct cpumask *dstp) | |
592 | { | |
593 | return bitmap_parselist_user(buf, len, cpumask_bits(dstp), | |
4d59b6cc | 594 | nr_cpumask_bits); |
4b060420 MT |
595 | } |
596 | ||
ba630e49 | 597 | /** |
b06fb415 | 598 | * cpumask_parse - extract a cpumask from a string |
ba630e49 TH |
599 | * @buf: the buffer to extract from |
600 | * @dstp: the cpumask to set. | |
601 | * | |
602 | * Returns -errno, or 0 for success. | |
603 | */ | |
604 | static inline int cpumask_parse(const char *buf, struct cpumask *dstp) | |
605 | { | |
606 | char *nl = strchr(buf, '\n'); | |
cea092c9 | 607 | unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf); |
ba630e49 | 608 | |
4d59b6cc | 609 | return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits); |
ba630e49 TH |
610 | } |
611 | ||
29c0177e | 612 | /** |
231daf07 | 613 | * cpulist_parse - extract a cpumask from a user string of ranges |
29c0177e | 614 | * @buf: the buffer to extract from |
29c0177e RR |
615 | * @dstp: the cpumask to set. |
616 | * | |
617 | * Returns -errno, or 0 for success. | |
618 | */ | |
619 | static inline int cpulist_parse(const char *buf, struct cpumask *dstp) | |
620 | { | |
4d59b6cc | 621 | return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); |
2d3854a3 RR |
622 | } |
623 | ||
624 | /** | |
625 | * cpumask_size - size to allocate for a 'struct cpumask' in bytes | |
2d3854a3 RR |
626 | */ |
627 | static inline size_t cpumask_size(void) | |
628 | { | |
cdfdef75 | 629 | return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); |
2d3854a3 RR |
630 | } |
631 | ||
632 | /* | |
633 | * cpumask_var_t: struct cpumask for stack usage. | |
634 | * | |
635 | * Oh, the wicked games we play! In order to make kernel coding a | |
636 | * little more difficult, we typedef cpumask_var_t to an array or a | |
637 | * pointer: doing &mask on an array is a noop, so it still works. | |
638 | * | |
639 | * ie. | |
640 | * cpumask_var_t tmpmask; | |
641 | * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
642 | * return -ENOMEM; | |
643 | * | |
644 | * ... use 'tmpmask' like a normal struct cpumask * ... | |
645 | * | |
646 | * free_cpumask_var(tmpmask); | |
a64a26e8 KM |
647 | * |
648 | * | |
649 | * However, one notable exception is there. alloc_cpumask_var() allocates | |
650 | * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has | |
651 | * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t. | |
652 | * | |
653 | * cpumask_var_t tmpmask; | |
654 | * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
655 | * return -ENOMEM; | |
656 | * | |
657 | * var = *tmpmask; | |
658 | * | |
659 | * This code makes NR_CPUS length memcopy and brings to a memory corruption. | |
660 | * cpumask_copy() provide safe copy functionality. | |
4ba29684 CL |
661 | * |
662 | * Note that there is another evil here: If you define a cpumask_var_t | |
663 | * as a percpu variable then the way to obtain the address of the cpumask | |
664 | * structure differently influences what this_cpu_* operation needs to be | |
665 | * used. Please use this_cpu_cpumask_var_t in those cases. The direct use | |
666 | * of this_cpu_ptr() or this_cpu_read() will lead to failures when the | |
667 | * other type of cpumask_var_t implementation is configured. | |
668802c2 WL |
668 | * |
669 | * Please also note that __cpumask_var_read_mostly can be used to declare | |
670 | * a cpumask_var_t variable itself (not its content) as read mostly. | |
2d3854a3 RR |
671 | */ |
672 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
673 | typedef struct cpumask *cpumask_var_t; | |
674 | ||
668802c2 WL |
675 | #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) |
676 | #define __cpumask_var_read_mostly __read_mostly | |
4ba29684 | 677 | |
7b4967c5 | 678 | bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
2d3854a3 | 679 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); |
0281b5dc YL |
680 | bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
681 | bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); | |
2d3854a3 RR |
682 | void alloc_bootmem_cpumask_var(cpumask_var_t *mask); |
683 | void free_cpumask_var(cpumask_var_t mask); | |
cd83e42c | 684 | void free_bootmem_cpumask_var(cpumask_var_t mask); |
2d3854a3 | 685 | |
f7e30f01 MK |
686 | static inline bool cpumask_available(cpumask_var_t mask) |
687 | { | |
688 | return mask != NULL; | |
689 | } | |
690 | ||
2d3854a3 RR |
691 | #else |
692 | typedef struct cpumask cpumask_var_t[1]; | |
693 | ||
4ba29684 | 694 | #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) |
668802c2 | 695 | #define __cpumask_var_read_mostly |
4ba29684 | 696 | |
2d3854a3 RR |
697 | static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
698 | { | |
699 | return true; | |
700 | } | |
701 | ||
7b4967c5 MT |
702 | static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, |
703 | int node) | |
704 | { | |
705 | return true; | |
706 | } | |
707 | ||
0281b5dc YL |
708 | static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
709 | { | |
710 | cpumask_clear(*mask); | |
711 | return true; | |
712 | } | |
713 | ||
714 | static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, | |
715 | int node) | |
716 | { | |
717 | cpumask_clear(*mask); | |
718 | return true; | |
719 | } | |
720 | ||
2d3854a3 RR |
721 | static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
722 | { | |
723 | } | |
724 | ||
725 | static inline void free_cpumask_var(cpumask_var_t mask) | |
726 | { | |
727 | } | |
cd83e42c RR |
728 | |
729 | static inline void free_bootmem_cpumask_var(cpumask_var_t mask) | |
730 | { | |
731 | } | |
f7e30f01 MK |
732 | |
733 | static inline bool cpumask_available(cpumask_var_t mask) | |
734 | { | |
735 | return true; | |
736 | } | |
2d3854a3 RR |
737 | #endif /* CONFIG_CPUMASK_OFFSTACK */ |
738 | ||
2d3854a3 RR |
739 | /* It's common to want to use cpu_all_mask in struct member initializers, |
740 | * so it has to refer to an address rather than a pointer. */ | |
741 | extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); | |
742 | #define cpu_all_mask to_cpumask(cpu_all_bits) | |
743 | ||
744 | /* First bits of cpu_bit_bitmap are in fact unset. */ | |
745 | #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) | |
746 | ||
ae7a47e7 RR |
747 | #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) |
748 | #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) | |
749 | #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) | |
750 | ||
2d3854a3 | 751 | /* Wrappers for arch boot code to manipulate normally-constant masks */ |
3fa41520 RR |
752 | void init_cpu_present(const struct cpumask *src); |
753 | void init_cpu_possible(const struct cpumask *src); | |
754 | void init_cpu_online(const struct cpumask *src); | |
6ba2ef7b | 755 | |
427d77a3 TG |
756 | static inline void reset_cpu_possible_mask(void) |
757 | { | |
758 | bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS); | |
759 | } | |
760 | ||
9425676a RV |
761 | static inline void |
762 | set_cpu_possible(unsigned int cpu, bool possible) | |
763 | { | |
764 | if (possible) | |
765 | cpumask_set_cpu(cpu, &__cpu_possible_mask); | |
766 | else | |
767 | cpumask_clear_cpu(cpu, &__cpu_possible_mask); | |
768 | } | |
769 | ||
770 | static inline void | |
771 | set_cpu_present(unsigned int cpu, bool present) | |
772 | { | |
773 | if (present) | |
774 | cpumask_set_cpu(cpu, &__cpu_present_mask); | |
775 | else | |
776 | cpumask_clear_cpu(cpu, &__cpu_present_mask); | |
777 | } | |
778 | ||
779 | static inline void | |
780 | set_cpu_online(unsigned int cpu, bool online) | |
781 | { | |
e9d867a6 | 782 | if (online) |
9425676a | 783 | cpumask_set_cpu(cpu, &__cpu_online_mask); |
e9d867a6 | 784 | else |
9425676a | 785 | cpumask_clear_cpu(cpu, &__cpu_online_mask); |
9425676a RV |
786 | } |
787 | ||
788 | static inline void | |
789 | set_cpu_active(unsigned int cpu, bool active) | |
790 | { | |
791 | if (active) | |
792 | cpumask_set_cpu(cpu, &__cpu_active_mask); | |
793 | else | |
794 | cpumask_clear_cpu(cpu, &__cpu_active_mask); | |
795 | } | |
796 | ||
797 | ||
6ba2ef7b RR |
798 | /** |
799 | * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * | |
800 | * @bitmap: the bitmap | |
801 | * | |
802 | * There are a few places where cpumask_var_t isn't appropriate and | |
803 | * static cpumasks must be used (eg. very early boot), yet we don't | |
804 | * expose the definition of 'struct cpumask'. | |
805 | * | |
806 | * This does the conversion, and can be used as a constant initializer. | |
807 | */ | |
808 | #define to_cpumask(bitmap) \ | |
809 | ((struct cpumask *)(1 ? (bitmap) \ | |
810 | : (void *)sizeof(__check_is_bitmap(bitmap)))) | |
811 | ||
812 | static inline int __check_is_bitmap(const unsigned long *bitmap) | |
813 | { | |
814 | return 1; | |
815 | } | |
816 | ||
817 | /* | |
818 | * Special-case data structure for "single bit set only" constant CPU masks. | |
819 | * | |
820 | * We pre-generate all the 64 (or 32) possible bit positions, with enough | |
821 | * padding to the left and the right, and return the constant pointer | |
822 | * appropriately offset. | |
823 | */ | |
824 | extern const unsigned long | |
825 | cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; | |
826 | ||
827 | static inline const struct cpumask *get_cpu_mask(unsigned int cpu) | |
828 | { | |
829 | const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; | |
830 | p -= cpu / BITS_PER_LONG; | |
831 | return to_cpumask(p); | |
832 | } | |
833 | ||
834 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) | |
835 | ||
836 | #if NR_CPUS <= BITS_PER_LONG | |
837 | #define CPU_BITS_ALL \ | |
838 | { \ | |
9941a383 | 839 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b RR |
840 | } |
841 | ||
842 | #else /* NR_CPUS > BITS_PER_LONG */ | |
843 | ||
844 | #define CPU_BITS_ALL \ | |
845 | { \ | |
846 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ | |
9941a383 | 847 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b RR |
848 | } |
849 | #endif /* NR_CPUS > BITS_PER_LONG */ | |
850 | ||
5aaba363 SH |
851 | /** |
852 | * cpumap_print_to_pagebuf - copies the cpumask into the buffer either | |
853 | * as comma-separated list of cpus or hex values of cpumask | |
854 | * @list: indicates whether the cpumap must be list | |
855 | * @mask: the cpumask to copy | |
856 | * @buf: the buffer to copy into | |
857 | * | |
858 | * Returns the length of the (null-terminated) @buf string, zero if | |
859 | * nothing is copied. | |
860 | */ | |
861 | static inline ssize_t | |
862 | cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) | |
863 | { | |
864 | return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask), | |
513e3d2d | 865 | nr_cpu_ids); |
5aaba363 SH |
866 | } |
867 | ||
6ba2ef7b | 868 | #if NR_CPUS <= BITS_PER_LONG |
6ba2ef7b RR |
869 | #define CPU_MASK_ALL \ |
870 | (cpumask_t) { { \ | |
9941a383 | 871 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b | 872 | } } |
6ba2ef7b | 873 | #else |
6ba2ef7b RR |
874 | #define CPU_MASK_ALL \ |
875 | (cpumask_t) { { \ | |
876 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ | |
9941a383 | 877 | [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ |
6ba2ef7b | 878 | } } |
9941a383 | 879 | #endif /* NR_CPUS > BITS_PER_LONG */ |
6ba2ef7b RR |
880 | |
881 | #define CPU_MASK_NONE \ | |
882 | (cpumask_t) { { \ | |
883 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ | |
884 | } } | |
885 | ||
1527781d RR |
886 | #define CPU_MASK_CPU0 \ |
887 | (cpumask_t) { { \ | |
888 | [0] = 1UL \ | |
889 | } } | |
890 | ||
1da177e4 | 891 | #endif /* __LINUX_CPUMASK_H */ |