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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_CPUMASK_H
2#define __LINUX_CPUMASK_H
3
4/*
5 * Cpumasks provide a bitmap suitable for representing the
Rusty Russell6ba2ef72009-09-24 09:34:53 -06006 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/kernel.h>
10#include <linux/threads.h>
11#include <linux/bitmap.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050012#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Rusty Russell2d3854a2008-11-05 13:39:10 +110014typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Rusty Russellae7a47e2008-12-30 09:05:15 +103016/**
Rusty Russell6ba2ef72009-09-24 09:34:53 -060017 * cpumask_bits - get the bits in a cpumask
18 * @maskp: the struct cpumask *
Rusty Russellae7a47e2008-12-30 09:05:15 +103019 *
Rusty Russell6ba2ef72009-09-24 09:34:53 -060020 * You should only assume nr_cpu_ids bits of this mask are valid. This is
21 * a macro so it's const-correct.
Rusty Russellae7a47e2008-12-30 09:05:15 +103022 */
Rusty Russell6ba2ef72009-09-24 09:34:53 -060023#define cpumask_bits(maskp) ((maskp)->bits)
Paul Jackson7ea931c2008-04-28 02:12:29 -070024
Mike Travis41df0d612008-05-12 21:21:13 +020025#if NR_CPUS == 1
Mike Travis41df0d612008-05-12 21:21:13 +020026#define nr_cpu_ids 1
Rusty Russell6ba2ef72009-09-24 09:34:53 -060027#else
Mike Travis41df0d612008-05-12 21:21:13 +020028extern int nr_cpu_ids;
Mike Travis41df0d612008-05-12 21:21:13 +020029#endif
30
Rusty Russell6ba2ef72009-09-24 09:34:53 -060031#ifdef CONFIG_CPUMASK_OFFSTACK
32/* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
33 * not all bits may be allocated. */
34#define nr_cpumask_bits nr_cpu_ids
35#else
36#define nr_cpumask_bits NR_CPUS
37#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/*
40 * The following particular system cpumasks and operations manage
Rusty Russellb3199c02008-12-30 09:05:14 +103041 * possible, present, active and online cpus.
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 *
Rusty Russellb3199c02008-12-30 09:05:14 +103043 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
44 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
45 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
46 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 *
Rusty Russellb3199c02008-12-30 09:05:14 +103048 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 *
Rusty Russellb3199c02008-12-30 09:05:14 +103050 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
51 * that it is possible might ever be plugged in at anytime during the
52 * life of that system boot. The cpu_present_mask is dynamic(*),
53 * representing which CPUs are currently plugged in. And
54 * cpu_online_mask is the dynamic subset of cpu_present_mask,
55 * indicating those CPUs available for scheduling.
56 *
57 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
59 * ACPI reports present at boot.
60 *
Rusty Russellb3199c02008-12-30 09:05:14 +103061 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * depending on what ACPI reports as currently plugged in, otherwise
Rusty Russellb3199c02008-12-30 09:05:14 +103063 * cpu_present_mask is just a copy of cpu_possible_mask.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 *
Rusty Russellb3199c02008-12-30 09:05:14 +103065 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
66 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 *
68 * Subtleties:
69 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
70 * assumption that their single CPU is online. The UP
Rusty Russellb3199c02008-12-30 09:05:14 +103071 * cpu_{online,possible,present}_masks are placebos. Changing them
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 * will have no useful affect on the following num_*_cpus()
73 * and cpu_*() macros in the UP case. This ugliness is a UP
74 * optimization - don't waste any instructions or memory references
75 * asking if you're online or how many CPUs there are if there is
76 * only one CPU.
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 */
78
Rusty Russellb3199c02008-12-30 09:05:14 +103079extern const struct cpumask *const cpu_possible_mask;
80extern const struct cpumask *const cpu_online_mask;
81extern const struct cpumask *const cpu_present_mask;
82extern const struct cpumask *const cpu_active_mask;
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#if NR_CPUS > 1
Rusty Russellae7a47e2008-12-30 09:05:15 +103085#define num_online_cpus() cpumask_weight(cpu_online_mask)
86#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
87#define num_present_cpus() cpumask_weight(cpu_present_mask)
Peter Zijlstra6ad4c182009-11-25 13:31:39 +010088#define num_active_cpus() cpumask_weight(cpu_active_mask)
Rusty Russellae7a47e2008-12-30 09:05:15 +103089#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
90#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
91#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
92#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#else
Heiko Carstens221e3eb2010-03-05 13:42:41 -080094#define num_online_cpus() 1U
95#define num_possible_cpus() 1U
96#define num_present_cpus() 1U
97#define num_active_cpus() 1U
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#define cpu_online(cpu) ((cpu) == 0)
99#define cpu_possible(cpu) ((cpu) == 0)
100#define cpu_present(cpu) ((cpu) == 0)
Max Krasnyanskye761b772008-07-15 04:43:49 -0700101#define cpu_active(cpu) ((cpu) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#endif
103
Rusty Russell2d3854a2008-11-05 13:39:10 +1100104/* verify cpu argument to cpumask_* operators */
105static inline unsigned int cpumask_check(unsigned int cpu)
106{
107#ifdef CONFIG_DEBUG_PER_CPU_MAPS
108 WARN_ON_ONCE(cpu >= nr_cpumask_bits);
109#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
110 return cpu;
111}
112
113#if NR_CPUS == 1
Rusty Russell984f2f32008-11-08 20:24:19 +1100114/* Uniprocessor. Assume all masks are "1". */
115static inline unsigned int cpumask_first(const struct cpumask *srcp)
116{
117 return 0;
118}
119
120/* Valid inputs for n are -1 and 0. */
121static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
122{
123 return n+1;
124}
125
126static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
127{
128 return n+1;
129}
130
131static inline unsigned int cpumask_next_and(int n,
132 const struct cpumask *srcp,
133 const struct cpumask *andp)
134{
135 return n+1;
136}
137
138/* cpu must be a valid cpu, ie 0, so there's no other choice. */
139static inline unsigned int cpumask_any_but(const struct cpumask *mask,
140 unsigned int cpu)
141{
142 return 1;
143}
Rusty Russell2d3854a2008-11-05 13:39:10 +1100144
Amir Vadaida913092014-06-09 10:24:38 +0300145static inline int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp)
146{
147 set_bit(0, cpumask_bits(dstp));
148
149 return 0;
150}
151
Rusty Russell2d3854a2008-11-05 13:39:10 +1100152#define for_each_cpu(cpu, mask) \
153 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
Paul E. McKenney8bd93a22010-02-22 17:04:59 -0800154#define for_each_cpu_not(cpu, mask) \
155 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
Rusty Russell2d3854a2008-11-05 13:39:10 +1100156#define for_each_cpu_and(cpu, mask, and) \
157 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
158#else
159/**
160 * cpumask_first - get the first cpu in a cpumask
161 * @srcp: the cpumask pointer
162 *
163 * Returns >= nr_cpu_ids if no cpus set.
164 */
165static inline unsigned int cpumask_first(const struct cpumask *srcp)
166{
167 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
168}
169
170/**
171 * cpumask_next - get the next cpu in a cpumask
172 * @n: the cpu prior to the place to search (ie. return will be > @n)
173 * @srcp: the cpumask pointer
174 *
175 * Returns >= nr_cpu_ids if no further cpus set.
176 */
177static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
178{
179 /* -1 is a legal arg here. */
180 if (n != -1)
181 cpumask_check(n);
182 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
183}
184
185/**
186 * cpumask_next_zero - get the next unset cpu in a cpumask
187 * @n: the cpu prior to the place to search (ie. return will be > @n)
188 * @srcp: the cpumask pointer
189 *
190 * Returns >= nr_cpu_ids if no further cpus unset.
191 */
192static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
193{
194 /* -1 is a legal arg here. */
195 if (n != -1)
196 cpumask_check(n);
197 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
198}
199
200int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
201int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
Amir Vadaida913092014-06-09 10:24:38 +0300202int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100203
Rusty Russell984f2f32008-11-08 20:24:19 +1100204/**
205 * for_each_cpu - iterate over every cpu in a mask
206 * @cpu: the (optionally unsigned) integer iterator
207 * @mask: the cpumask pointer
208 *
209 * After the loop, cpu is >= nr_cpu_ids.
210 */
Rusty Russell2d3854a2008-11-05 13:39:10 +1100211#define for_each_cpu(cpu, mask) \
212 for ((cpu) = -1; \
213 (cpu) = cpumask_next((cpu), (mask)), \
214 (cpu) < nr_cpu_ids;)
Rusty Russell984f2f32008-11-08 20:24:19 +1100215
216/**
Paul E. McKenney8bd93a22010-02-22 17:04:59 -0800217 * for_each_cpu_not - iterate over every cpu in a complemented mask
218 * @cpu: the (optionally unsigned) integer iterator
219 * @mask: the cpumask pointer
220 *
221 * After the loop, cpu is >= nr_cpu_ids.
222 */
223#define for_each_cpu_not(cpu, mask) \
224 for ((cpu) = -1; \
225 (cpu) = cpumask_next_zero((cpu), (mask)), \
226 (cpu) < nr_cpu_ids;)
227
228/**
Rusty Russell984f2f32008-11-08 20:24:19 +1100229 * for_each_cpu_and - iterate over every cpu in both masks
230 * @cpu: the (optionally unsigned) integer iterator
231 * @mask: the first cpumask pointer
232 * @and: the second cpumask pointer
233 *
234 * This saves a temporary CPU mask in many places. It is equivalent to:
235 * struct cpumask tmp;
236 * cpumask_and(&tmp, &mask, &and);
237 * for_each_cpu(cpu, &tmp)
238 * ...
239 *
240 * After the loop, cpu is >= nr_cpu_ids.
241 */
Rusty Russell2d3854a2008-11-05 13:39:10 +1100242#define for_each_cpu_and(cpu, mask, and) \
243 for ((cpu) = -1; \
244 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
245 (cpu) < nr_cpu_ids;)
246#endif /* SMP */
247
248#define CPU_BITS_NONE \
249{ \
250 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
251}
252
253#define CPU_BITS_CPU0 \
254{ \
255 [0] = 1UL \
256}
257
258/**
259 * cpumask_set_cpu - set a cpu in a cpumask
260 * @cpu: cpu number (< nr_cpu_ids)
261 * @dstp: the cpumask pointer
262 */
263static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
264{
265 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
266}
267
268/**
269 * cpumask_clear_cpu - clear a cpu in a cpumask
270 * @cpu: cpu number (< nr_cpu_ids)
271 * @dstp: the cpumask pointer
272 */
273static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
274{
275 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
276}
277
278/**
279 * cpumask_test_cpu - test for a cpu in a cpumask
280 * @cpu: cpu number (< nr_cpu_ids)
281 * @cpumask: the cpumask pointer
282 *
Alex Shic777ad62012-05-28 22:23:51 +0800283 * Returns 1 if @cpu is set in @cpumask, else returns 0
284 *
Rusty Russell2d3854a2008-11-05 13:39:10 +1100285 * No static inline type checking - see Subtlety (1) above.
286 */
287#define cpumask_test_cpu(cpu, cpumask) \
Rusty Russellae7a47e2008-12-30 09:05:15 +1030288 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
Rusty Russell2d3854a2008-11-05 13:39:10 +1100289
290/**
291 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
292 * @cpu: cpu number (< nr_cpu_ids)
293 * @cpumask: the cpumask pointer
294 *
Alex Shic777ad62012-05-28 22:23:51 +0800295 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
296 *
Rusty Russell2d3854a2008-11-05 13:39:10 +1100297 * test_and_set_bit wrapper for cpumasks.
298 */
299static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
300{
301 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
302}
303
304/**
Xiao Guangrong54fdade2009-09-22 16:43:39 -0700305 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
306 * @cpu: cpu number (< nr_cpu_ids)
307 * @cpumask: the cpumask pointer
308 *
Alex Shic777ad62012-05-28 22:23:51 +0800309 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
310 *
Xiao Guangrong54fdade2009-09-22 16:43:39 -0700311 * test_and_clear_bit wrapper for cpumasks.
312 */
313static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
314{
315 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
316}
317
318/**
Rusty Russell2d3854a2008-11-05 13:39:10 +1100319 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
320 * @dstp: the cpumask pointer
321 */
322static inline void cpumask_setall(struct cpumask *dstp)
323{
324 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
325}
326
327/**
328 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
329 * @dstp: the cpumask pointer
330 */
331static inline void cpumask_clear(struct cpumask *dstp)
332{
333 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
334}
335
336/**
337 * cpumask_and - *dstp = *src1p & *src2p
338 * @dstp: the cpumask result
339 * @src1p: the first input
340 * @src2p: the second input
Alex Shic777ad62012-05-28 22:23:51 +0800341 *
342 * If *@dstp is empty, returns 0, else returns 1
Rusty Russell2d3854a2008-11-05 13:39:10 +1100343 */
Linus Torvaldsf4b03732009-08-21 09:26:15 -0700344static inline int cpumask_and(struct cpumask *dstp,
Rusty Russell2d3854a2008-11-05 13:39:10 +1100345 const struct cpumask *src1p,
346 const struct cpumask *src2p)
347{
Linus Torvaldsf4b03732009-08-21 09:26:15 -0700348 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
Rusty Russell2d3854a2008-11-05 13:39:10 +1100349 cpumask_bits(src2p), nr_cpumask_bits);
350}
351
352/**
353 * cpumask_or - *dstp = *src1p | *src2p
354 * @dstp: the cpumask result
355 * @src1p: the first input
356 * @src2p: the second input
357 */
358static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
359 const struct cpumask *src2p)
360{
361 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
362 cpumask_bits(src2p), nr_cpumask_bits);
363}
364
365/**
366 * cpumask_xor - *dstp = *src1p ^ *src2p
367 * @dstp: the cpumask result
368 * @src1p: the first input
369 * @src2p: the second input
370 */
371static inline void cpumask_xor(struct cpumask *dstp,
372 const struct cpumask *src1p,
373 const struct cpumask *src2p)
374{
375 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
376 cpumask_bits(src2p), nr_cpumask_bits);
377}
378
379/**
380 * cpumask_andnot - *dstp = *src1p & ~*src2p
381 * @dstp: the cpumask result
382 * @src1p: the first input
383 * @src2p: the second input
Alex Shic777ad62012-05-28 22:23:51 +0800384 *
385 * If *@dstp is empty, returns 0, else returns 1
Rusty Russell2d3854a2008-11-05 13:39:10 +1100386 */
Linus Torvaldsf4b03732009-08-21 09:26:15 -0700387static inline int cpumask_andnot(struct cpumask *dstp,
Rusty Russell2d3854a2008-11-05 13:39:10 +1100388 const struct cpumask *src1p,
389 const struct cpumask *src2p)
390{
Linus Torvaldsf4b03732009-08-21 09:26:15 -0700391 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
Rusty Russell2d3854a2008-11-05 13:39:10 +1100392 cpumask_bits(src2p), nr_cpumask_bits);
393}
394
395/**
396 * cpumask_complement - *dstp = ~*srcp
397 * @dstp: the cpumask result
398 * @srcp: the input to invert
399 */
400static inline void cpumask_complement(struct cpumask *dstp,
401 const struct cpumask *srcp)
402{
403 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
404 nr_cpumask_bits);
405}
406
407/**
408 * cpumask_equal - *src1p == *src2p
409 * @src1p: the first input
410 * @src2p: the second input
411 */
412static inline bool cpumask_equal(const struct cpumask *src1p,
413 const struct cpumask *src2p)
414{
415 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
416 nr_cpumask_bits);
417}
418
419/**
420 * cpumask_intersects - (*src1p & *src2p) != 0
421 * @src1p: the first input
422 * @src2p: the second input
423 */
424static inline bool cpumask_intersects(const struct cpumask *src1p,
425 const struct cpumask *src2p)
426{
427 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
428 nr_cpumask_bits);
429}
430
431/**
432 * cpumask_subset - (*src1p & ~*src2p) == 0
433 * @src1p: the first input
434 * @src2p: the second input
Alex Shic777ad62012-05-28 22:23:51 +0800435 *
436 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
Rusty Russell2d3854a2008-11-05 13:39:10 +1100437 */
438static inline int cpumask_subset(const struct cpumask *src1p,
439 const struct cpumask *src2p)
440{
441 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
442 nr_cpumask_bits);
443}
444
445/**
446 * cpumask_empty - *srcp == 0
447 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
448 */
449static inline bool cpumask_empty(const struct cpumask *srcp)
450{
451 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
452}
453
454/**
455 * cpumask_full - *srcp == 0xFFFFFFFF...
456 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
457 */
458static inline bool cpumask_full(const struct cpumask *srcp)
459{
460 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
461}
462
463/**
464 * cpumask_weight - Count of bits in *srcp
465 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
466 */
467static inline unsigned int cpumask_weight(const struct cpumask *srcp)
468{
469 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
470}
471
472/**
473 * cpumask_shift_right - *dstp = *srcp >> n
474 * @dstp: the cpumask result
475 * @srcp: the input to shift
476 * @n: the number of bits to shift by
477 */
478static inline void cpumask_shift_right(struct cpumask *dstp,
479 const struct cpumask *srcp, int n)
480{
481 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
482 nr_cpumask_bits);
483}
484
485/**
486 * cpumask_shift_left - *dstp = *srcp << n
487 * @dstp: the cpumask result
488 * @srcp: the input to shift
489 * @n: the number of bits to shift by
490 */
491static inline void cpumask_shift_left(struct cpumask *dstp,
492 const struct cpumask *srcp, int n)
493{
494 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
495 nr_cpumask_bits);
496}
497
498/**
499 * cpumask_copy - *dstp = *srcp
500 * @dstp: the result
501 * @srcp: the input cpumask
502 */
503static inline void cpumask_copy(struct cpumask *dstp,
504 const struct cpumask *srcp)
505{
506 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
507}
508
509/**
510 * cpumask_any - pick a "random" cpu from *srcp
511 * @srcp: the input cpumask
512 *
513 * Returns >= nr_cpu_ids if no cpus set.
514 */
515#define cpumask_any(srcp) cpumask_first(srcp)
516
517/**
518 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
519 * @src1p: the first input
520 * @src2p: the second input
521 *
522 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
523 */
524#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
525
526/**
527 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
528 * @mask1: the first input cpumask
529 * @mask2: the second input cpumask
530 *
531 * Returns >= nr_cpu_ids if no cpus set.
532 */
533#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
534
535/**
Rusty Russellcd83e422008-11-07 11:12:29 +1100536 * cpumask_of - the cpumask containing just a given cpu
537 * @cpu: the cpu (<= nr_cpu_ids)
538 */
539#define cpumask_of(cpu) (get_cpu_mask(cpu))
540
541/**
Rusty Russell29c01772008-12-13 21:20:25 +1030542 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
543 * @buf: the buffer to sprintf into
544 * @len: the length of the buffer
545 * @srcp: the cpumask to print
546 *
547 * If len is zero, returns zero. Otherwise returns the length of the
548 * (nul-terminated) @buf string.
549 */
550static inline int cpumask_scnprintf(char *buf, int len,
551 const struct cpumask *srcp)
552{
Rusty Russellae7a47e2008-12-30 09:05:15 +1030553 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
Rusty Russell29c01772008-12-13 21:20:25 +1030554}
555
556/**
557 * cpumask_parse_user - extract a cpumask from a user string
558 * @buf: the buffer to extract from
559 * @len: the length of the buffer
560 * @dstp: the cpumask to set.
561 *
562 * Returns -errno, or 0 for success.
563 */
564static inline int cpumask_parse_user(const char __user *buf, int len,
565 struct cpumask *dstp)
566{
Rusty Russellae7a47e2008-12-30 09:05:15 +1030567 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
Rusty Russell29c01772008-12-13 21:20:25 +1030568}
569
570/**
Mike Travis4b060422011-05-24 17:13:12 -0700571 * cpumask_parselist_user - extract a cpumask from a user string
572 * @buf: the buffer to extract from
573 * @len: the length of the buffer
574 * @dstp: the cpumask to set.
575 *
576 * Returns -errno, or 0 for success.
577 */
578static inline int cpumask_parselist_user(const char __user *buf, int len,
579 struct cpumask *dstp)
580{
581 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
582 nr_cpumask_bits);
583}
584
585/**
Rusty Russell29c01772008-12-13 21:20:25 +1030586 * cpulist_scnprintf - print a cpumask into a string as comma-separated list
587 * @buf: the buffer to sprintf into
588 * @len: the length of the buffer
589 * @srcp: the cpumask to print
590 *
591 * If len is zero, returns zero. Otherwise returns the length of the
592 * (nul-terminated) @buf string.
593 */
594static inline int cpulist_scnprintf(char *buf, int len,
595 const struct cpumask *srcp)
596{
Rusty Russellae7a47e2008-12-30 09:05:15 +1030597 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
598 nr_cpumask_bits);
Rusty Russell29c01772008-12-13 21:20:25 +1030599}
600
601/**
Tejun Heoba630e42013-03-12 11:30:04 -0700602 * cpumask_parse - extract a cpumask from from a string
603 * @buf: the buffer to extract from
604 * @dstp: the cpumask to set.
605 *
606 * Returns -errno, or 0 for success.
607 */
608static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
609{
610 char *nl = strchr(buf, '\n');
Brian W Hartcea092c2014-05-14 10:33:45 +0930611 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf);
Tejun Heoba630e42013-03-12 11:30:04 -0700612
613 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
614}
615
616/**
Alex Shi231daf02012-07-27 09:29:42 +0930617 * cpulist_parse - extract a cpumask from a user string of ranges
Rusty Russell29c01772008-12-13 21:20:25 +1030618 * @buf: the buffer to extract from
Rusty Russell29c01772008-12-13 21:20:25 +1030619 * @dstp: the cpumask to set.
620 *
621 * Returns -errno, or 0 for success.
622 */
623static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
624{
Rusty Russellae7a47e2008-12-30 09:05:15 +1030625 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100626}
627
628/**
629 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
630 *
631 * This will eventually be a runtime variable, depending on nr_cpu_ids.
632 */
633static inline size_t cpumask_size(void)
634{
635 /* FIXME: Once all cpumask assignments are eliminated, this
636 * can be nr_cpumask_bits */
637 return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
638}
639
640/*
641 * cpumask_var_t: struct cpumask for stack usage.
642 *
643 * Oh, the wicked games we play! In order to make kernel coding a
644 * little more difficult, we typedef cpumask_var_t to an array or a
645 * pointer: doing &mask on an array is a noop, so it still works.
646 *
647 * ie.
648 * cpumask_var_t tmpmask;
649 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
650 * return -ENOMEM;
651 *
652 * ... use 'tmpmask' like a normal struct cpumask * ...
653 *
654 * free_cpumask_var(tmpmask);
KOSAKI Motohiroa64a26e2011-07-26 16:08:45 -0700655 *
656 *
657 * However, one notable exception is there. alloc_cpumask_var() allocates
658 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
659 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
660 *
661 * cpumask_var_t tmpmask;
662 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
663 * return -ENOMEM;
664 *
665 * var = *tmpmask;
666 *
667 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
668 * cpumask_copy() provide safe copy functionality.
Christoph Lameter4ba29682014-08-26 19:12:21 -0500669 *
670 * Note that there is another evil here: If you define a cpumask_var_t
671 * as a percpu variable then the way to obtain the address of the cpumask
672 * structure differently influences what this_cpu_* operation needs to be
673 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
674 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
675 * other type of cpumask_var_t implementation is configured.
Rusty Russell2d3854a2008-11-05 13:39:10 +1100676 */
677#ifdef CONFIG_CPUMASK_OFFSTACK
678typedef struct cpumask *cpumask_var_t;
679
Christoph Lameter4ba29682014-08-26 19:12:21 -0500680#define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
681
Mike Travis7b4967c2008-12-19 16:56:37 +1030682bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100683bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
Yinghai Lu0281b5d2009-06-06 14:50:36 -0700684bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
685bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100686void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
687void free_cpumask_var(cpumask_var_t mask);
Rusty Russellcd83e422008-11-07 11:12:29 +1100688void free_bootmem_cpumask_var(cpumask_var_t mask);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100689
690#else
691typedef struct cpumask cpumask_var_t[1];
692
Christoph Lameter4ba29682014-08-26 19:12:21 -0500693#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
694
Rusty Russell2d3854a2008-11-05 13:39:10 +1100695static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
696{
697 return true;
698}
699
Mike Travis7b4967c2008-12-19 16:56:37 +1030700static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
701 int node)
702{
703 return true;
704}
705
Yinghai Lu0281b5d2009-06-06 14:50:36 -0700706static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
707{
708 cpumask_clear(*mask);
709 return true;
710}
711
712static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
713 int node)
714{
715 cpumask_clear(*mask);
716 return true;
717}
718
Rusty Russell2d3854a2008-11-05 13:39:10 +1100719static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
720{
721}
722
723static inline void free_cpumask_var(cpumask_var_t mask)
724{
725}
Rusty Russellcd83e422008-11-07 11:12:29 +1100726
727static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
728{
729}
Rusty Russell2d3854a2008-11-05 13:39:10 +1100730#endif /* CONFIG_CPUMASK_OFFSTACK */
731
Rusty Russell2d3854a2008-11-05 13:39:10 +1100732/* It's common to want to use cpu_all_mask in struct member initializers,
733 * so it has to refer to an address rather than a pointer. */
734extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
735#define cpu_all_mask to_cpumask(cpu_all_bits)
736
737/* First bits of cpu_bit_bitmap are in fact unset. */
738#define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
739
Rusty Russellae7a47e2008-12-30 09:05:15 +1030740#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
741#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
742#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
743
Rusty Russell2d3854a2008-11-05 13:39:10 +1100744/* Wrappers for arch boot code to manipulate normally-constant masks */
Rusty Russell3fa41522008-12-30 09:05:16 +1030745void set_cpu_possible(unsigned int cpu, bool possible);
746void set_cpu_present(unsigned int cpu, bool present);
747void set_cpu_online(unsigned int cpu, bool online);
748void set_cpu_active(unsigned int cpu, bool active);
749void init_cpu_present(const struct cpumask *src);
750void init_cpu_possible(const struct cpumask *src);
751void init_cpu_online(const struct cpumask *src);
Rusty Russell6ba2ef72009-09-24 09:34:53 -0600752
753/**
754 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
755 * @bitmap: the bitmap
756 *
757 * There are a few places where cpumask_var_t isn't appropriate and
758 * static cpumasks must be used (eg. very early boot), yet we don't
759 * expose the definition of 'struct cpumask'.
760 *
761 * This does the conversion, and can be used as a constant initializer.
762 */
763#define to_cpumask(bitmap) \
764 ((struct cpumask *)(1 ? (bitmap) \
765 : (void *)sizeof(__check_is_bitmap(bitmap))))
766
767static inline int __check_is_bitmap(const unsigned long *bitmap)
768{
769 return 1;
770}
771
772/*
773 * Special-case data structure for "single bit set only" constant CPU masks.
774 *
775 * We pre-generate all the 64 (or 32) possible bit positions, with enough
776 * padding to the left and the right, and return the constant pointer
777 * appropriately offset.
778 */
779extern const unsigned long
780 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
781
782static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
783{
784 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
785 p -= cpu / BITS_PER_LONG;
786 return to_cpumask(p);
787}
788
789#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
790
791#if NR_CPUS <= BITS_PER_LONG
792#define CPU_BITS_ALL \
793{ \
794 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
795}
796
797#else /* NR_CPUS > BITS_PER_LONG */
798
799#define CPU_BITS_ALL \
800{ \
801 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
802 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
803}
804#endif /* NR_CPUS > BITS_PER_LONG */
805
Sudeep Holla5aaba362014-09-30 14:48:22 +0100806/**
807 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
808 * as comma-separated list of cpus or hex values of cpumask
809 * @list: indicates whether the cpumap must be list
810 * @mask: the cpumask to copy
811 * @buf: the buffer to copy into
812 *
813 * Returns the length of the (null-terminated) @buf string, zero if
814 * nothing is copied.
815 */
816static inline ssize_t
817cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
818{
819 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
820 nr_cpumask_bits);
821}
822
Rusty Russell6ba2ef72009-09-24 09:34:53 -0600823/*
824 *
825 * From here down, all obsolete. Use cpumask_ variants!
826 *
827 */
828#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
Rusty Russell6ba2ef72009-09-24 09:34:53 -0600829#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
830
831#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
832
833#if NR_CPUS <= BITS_PER_LONG
834
835#define CPU_MASK_ALL \
836(cpumask_t) { { \
837 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
838} }
839
840#else
841
842#define CPU_MASK_ALL \
843(cpumask_t) { { \
844 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
845 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
846} }
847
848#endif
849
850#define CPU_MASK_NONE \
851(cpumask_t) { { \
852 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
853} }
854
855#define CPU_MASK_CPU0 \
856(cpumask_t) { { \
857 [0] = 1UL \
858} }
859
860#if NR_CPUS == 1
861#define first_cpu(src) ({ (void)(src); 0; })
862#define next_cpu(n, src) ({ (void)(src); 1; })
863#define any_online_cpu(mask) 0
864#define for_each_cpu_mask(cpu, mask) \
865 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
866#else /* NR_CPUS > 1 */
867int __first_cpu(const cpumask_t *srcp);
868int __next_cpu(int n, const cpumask_t *srcp);
Rusty Russell6ba2ef72009-09-24 09:34:53 -0600869
870#define first_cpu(src) __first_cpu(&(src))
871#define next_cpu(n, src) __next_cpu((n), &(src))
Srivatsa S. Bhat38b93782012-03-28 14:42:46 -0700872#define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask)
Rusty Russell6ba2ef72009-09-24 09:34:53 -0600873#define for_each_cpu_mask(cpu, mask) \
874 for ((cpu) = -1; \
875 (cpu) = next_cpu((cpu), (mask)), \
876 (cpu) < NR_CPUS; )
877#endif /* SMP */
878
879#if NR_CPUS <= 64
880
881#define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
882
883#else /* NR_CPUS > 64 */
884
885int __next_cpu_nr(int n, const cpumask_t *srcp);
886#define for_each_cpu_mask_nr(cpu, mask) \
887 for ((cpu) = -1; \
888 (cpu) = __next_cpu_nr((cpu), &(mask)), \
889 (cpu) < nr_cpu_ids; )
890
891#endif /* NR_CPUS > 64 */
892
893#define cpus_addr(src) ((src).bits)
894
895#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
896static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
897{
898 set_bit(cpu, dstp->bits);
899}
900
901#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
902static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
903{
904 clear_bit(cpu, dstp->bits);
905}
906
907#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
908static inline void __cpus_setall(cpumask_t *dstp, int nbits)
909{
910 bitmap_fill(dstp->bits, nbits);
911}
912
913#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
914static inline void __cpus_clear(cpumask_t *dstp, int nbits)
915{
916 bitmap_zero(dstp->bits, nbits);
917}
918
919/* No static inline type checking - see Subtlety (1) above. */
920#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
921
922#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
923static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
924{
925 return test_and_set_bit(cpu, addr->bits);
926}
927
928#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
929static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
930 const cpumask_t *src2p, int nbits)
931{
932 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
933}
934
935#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
936static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
937 const cpumask_t *src2p, int nbits)
938{
939 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
940}
941
942#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
943static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
944 const cpumask_t *src2p, int nbits)
945{
946 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
947}
948
949#define cpus_andnot(dst, src1, src2) \
950 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
951static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
952 const cpumask_t *src2p, int nbits)
953{
954 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
955}
956
957#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
958static inline int __cpus_equal(const cpumask_t *src1p,
959 const cpumask_t *src2p, int nbits)
960{
961 return bitmap_equal(src1p->bits, src2p->bits, nbits);
962}
963
964#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
965static inline int __cpus_intersects(const cpumask_t *src1p,
966 const cpumask_t *src2p, int nbits)
967{
968 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
969}
970
971#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
972static inline int __cpus_subset(const cpumask_t *src1p,
973 const cpumask_t *src2p, int nbits)
974{
975 return bitmap_subset(src1p->bits, src2p->bits, nbits);
976}
977
978#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
979static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
980{
981 return bitmap_empty(srcp->bits, nbits);
982}
983
984#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
985static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
986{
987 return bitmap_weight(srcp->bits, nbits);
988}
989
990#define cpus_shift_left(dst, src, n) \
991 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
992static inline void __cpus_shift_left(cpumask_t *dstp,
993 const cpumask_t *srcp, int n, int nbits)
994{
995 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
996}
997#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999#endif /* __LINUX_CPUMASK_H */