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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
6 * set of CPU's in a system, one bit position per CPU number.
7 *
8 * See detailed comments in the file linux/bitmap.h describing the
9 * data type on which these cpumasks are based.
10 *
Reinette Chatre01a3ee22006-10-11 01:21:55 -070011 * For details of cpumask_scnprintf() and cpumask_parse_user(),
12 * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * For details of cpulist_scnprintf() and cpulist_parse(), see
14 * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
Paul Jacksonfb5eeee2005-10-30 15:02:33 -080015 * For details of cpu_remap(), see bitmap_bitremap in lib/bitmap.c
16 * For details of cpus_remap(), see bitmap_remap in lib/bitmap.c.
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
18 * The available cpumask operations are:
19 *
20 * void cpu_set(cpu, mask) turn on bit 'cpu' in mask
21 * void cpu_clear(cpu, mask) turn off bit 'cpu' in mask
22 * void cpus_setall(mask) set all bits
23 * void cpus_clear(mask) clear all bits
24 * int cpu_isset(cpu, mask) true iff bit 'cpu' set in mask
25 * int cpu_test_and_set(cpu, mask) test and set bit 'cpu' in mask
26 *
27 * void cpus_and(dst, src1, src2) dst = src1 & src2 [intersection]
28 * void cpus_or(dst, src1, src2) dst = src1 | src2 [union]
29 * void cpus_xor(dst, src1, src2) dst = src1 ^ src2
30 * void cpus_andnot(dst, src1, src2) dst = src1 & ~src2
31 * void cpus_complement(dst, src) dst = ~src
32 *
33 * int cpus_equal(mask1, mask2) Does mask1 == mask2?
34 * int cpus_intersects(mask1, mask2) Do mask1 and mask2 intersect?
35 * int cpus_subset(mask1, mask2) Is mask1 a subset of mask2?
36 * int cpus_empty(mask) Is mask empty (no bits sets)?
37 * int cpus_full(mask) Is mask full (all bits sets)?
38 * int cpus_weight(mask) Hamming weigh - number of set bits
39 *
40 * void cpus_shift_right(dst, src, n) Shift right
41 * void cpus_shift_left(dst, src, n) Shift left
42 *
43 * int first_cpu(mask) Number lowest set bit, or NR_CPUS
44 * int next_cpu(cpu, mask) Next cpu past 'cpu', or NR_CPUS
45 *
46 * cpumask_t cpumask_of_cpu(cpu) Return cpumask with bit 'cpu' set
47 * CPU_MASK_ALL Initializer - all bits set
48 * CPU_MASK_NONE Initializer - no bits set
49 * unsigned long *cpus_addr(mask) Array of unsigned long's in mask
50 *
51 * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing
Reinette Chatre01a3ee22006-10-11 01:21:55 -070052 * int cpumask_parse_user(ubuf, ulen, mask) Parse ascii string as cpumask
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 * int cpulist_scnprintf(buf, len, mask) Format cpumask as list for printing
54 * int cpulist_parse(buf, map) Parse ascii string as cpulist
Paul Jacksonfb5eeee2005-10-30 15:02:33 -080055 * int cpu_remap(oldbit, old, new) newbit = map(old, new)(oldbit)
56 * int cpus_remap(dst, src, old, new) *dst = map(old, new)(src)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * for_each_cpu_mask(cpu, mask) for-loop cpu over mask
59 *
60 * int num_online_cpus() Number of online CPUs
61 * int num_possible_cpus() Number of all possible CPUs
62 * int num_present_cpus() Number of present CPUs
63 *
64 * int cpu_online(cpu) Is some cpu online?
65 * int cpu_possible(cpu) Is some cpu possible?
66 * int cpu_present(cpu) Is some cpu present (can schedule)?
67 *
68 * int any_online_cpu(mask) First online cpu in mask
69 *
KAMEZAWA Hiroyuki631d6742006-03-28 01:56:36 -080070 * for_each_possible_cpu(cpu) for-loop cpu over cpu_possible_map
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * for_each_online_cpu(cpu) for-loop cpu over cpu_online_map
72 * for_each_present_cpu(cpu) for-loop cpu over cpu_present_map
73 *
74 * Subtlety:
75 * 1) The 'type-checked' form of cpu_isset() causes gcc (3.3.2, anyway)
76 * to generate slightly worse code. Note for example the additional
77 * 40 lines of assembly code compiling the "for each possible cpu"
78 * loops buried in the disk_stat_read() macros calls when compiling
79 * drivers/block/genhd.c (arch i386, CONFIG_SMP=y). So use a simple
80 * one-line #define for cpu_isset(), instead of wrapping an inline
81 * inside a macro, the way we do the other calls.
82 */
83
84#include <linux/kernel.h>
85#include <linux/threads.h>
86#include <linux/bitmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88typedef struct { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
89extern cpumask_t _unused_cpumask_arg_;
90
91#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
92static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
93{
94 set_bit(cpu, dstp->bits);
95}
96
97#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
98static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
99{
100 clear_bit(cpu, dstp->bits);
101}
102
103#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
104static inline void __cpus_setall(cpumask_t *dstp, int nbits)
105{
106 bitmap_fill(dstp->bits, nbits);
107}
108
109#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
110static inline void __cpus_clear(cpumask_t *dstp, int nbits)
111{
112 bitmap_zero(dstp->bits, nbits);
113}
114
115/* No static inline type checking - see Subtlety (1) above. */
116#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
117
118#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
119static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
120{
121 return test_and_set_bit(cpu, addr->bits);
122}
123
124#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
125static inline void __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
126 const cpumask_t *src2p, int nbits)
127{
128 bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
129}
130
131#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
132static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
133 const cpumask_t *src2p, int nbits)
134{
135 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
136}
137
138#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
139static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
140 const cpumask_t *src2p, int nbits)
141{
142 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
143}
144
145#define cpus_andnot(dst, src1, src2) \
146 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
147static inline void __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
148 const cpumask_t *src2p, int nbits)
149{
150 bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
151}
152
153#define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS)
154static inline void __cpus_complement(cpumask_t *dstp,
155 const cpumask_t *srcp, int nbits)
156{
157 bitmap_complement(dstp->bits, srcp->bits, nbits);
158}
159
160#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
161static inline int __cpus_equal(const cpumask_t *src1p,
162 const cpumask_t *src2p, int nbits)
163{
164 return bitmap_equal(src1p->bits, src2p->bits, nbits);
165}
166
167#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
168static inline int __cpus_intersects(const cpumask_t *src1p,
169 const cpumask_t *src2p, int nbits)
170{
171 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
172}
173
174#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
175static inline int __cpus_subset(const cpumask_t *src1p,
176 const cpumask_t *src2p, int nbits)
177{
178 return bitmap_subset(src1p->bits, src2p->bits, nbits);
179}
180
181#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
182static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
183{
184 return bitmap_empty(srcp->bits, nbits);
185}
186
187#define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS)
188static inline int __cpus_full(const cpumask_t *srcp, int nbits)
189{
190 return bitmap_full(srcp->bits, nbits);
191}
192
193#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
194static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
195{
196 return bitmap_weight(srcp->bits, nbits);
197}
198
199#define cpus_shift_right(dst, src, n) \
200 __cpus_shift_right(&(dst), &(src), (n), NR_CPUS)
201static inline void __cpus_shift_right(cpumask_t *dstp,
202 const cpumask_t *srcp, int n, int nbits)
203{
204 bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
205}
206
207#define cpus_shift_left(dst, src, n) \
208 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
209static inline void __cpus_shift_left(cpumask_t *dstp,
210 const cpumask_t *srcp, int n, int nbits)
211{
212 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
213}
214
Andrew Mortonccb46002006-03-25 03:08:08 -0800215#ifdef CONFIG_SMP
216int __first_cpu(const cpumask_t *srcp);
217#define first_cpu(src) __first_cpu(&(src))
Andrew Morton3d18bd72006-03-25 03:08:09 -0800218int __next_cpu(int n, const cpumask_t *srcp);
219#define next_cpu(n, src) __next_cpu((n), &(src))
Andrew Mortonccb46002006-03-25 03:08:08 -0800220#else
Andrew Morton3d18bd72006-03-25 03:08:09 -0800221#define first_cpu(src) 0
222#define next_cpu(n, src) 1
Andrew Mortonccb46002006-03-25 03:08:08 -0800223#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225#define cpumask_of_cpu(cpu) \
226({ \
227 typeof(_unused_cpumask_arg_) m; \
228 if (sizeof(m) == sizeof(unsigned long)) { \
229 m.bits[0] = 1UL<<(cpu); \
230 } else { \
231 cpus_clear(m); \
232 cpu_set((cpu), m); \
233 } \
234 m; \
235})
236
237#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
238
239#if NR_CPUS <= BITS_PER_LONG
240
241#define CPU_MASK_ALL \
242(cpumask_t) { { \
243 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
244} }
245
246#else
247
248#define CPU_MASK_ALL \
249(cpumask_t) { { \
250 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
251 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
252} }
253
254#endif
255
256#define CPU_MASK_NONE \
257(cpumask_t) { { \
258 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
259} }
260
261#define CPU_MASK_CPU0 \
262(cpumask_t) { { \
263 [0] = 1UL \
264} }
265
266#define cpus_addr(src) ((src).bits)
267
268#define cpumask_scnprintf(buf, len, src) \
269 __cpumask_scnprintf((buf), (len), &(src), NR_CPUS)
270static inline int __cpumask_scnprintf(char *buf, int len,
271 const cpumask_t *srcp, int nbits)
272{
273 return bitmap_scnprintf(buf, len, srcp->bits, nbits);
274}
275
Reinette Chatre01a3ee22006-10-11 01:21:55 -0700276#define cpumask_parse_user(ubuf, ulen, dst) \
277 __cpumask_parse_user((ubuf), (ulen), &(dst), NR_CPUS)
278static inline int __cpumask_parse_user(const char __user *buf, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 cpumask_t *dstp, int nbits)
280{
Reinette Chatre01a3ee22006-10-11 01:21:55 -0700281 return bitmap_parse_user(buf, len, dstp->bits, nbits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
284#define cpulist_scnprintf(buf, len, src) \
285 __cpulist_scnprintf((buf), (len), &(src), NR_CPUS)
286static inline int __cpulist_scnprintf(char *buf, int len,
287 const cpumask_t *srcp, int nbits)
288{
289 return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
290}
291
292#define cpulist_parse(buf, dst) __cpulist_parse((buf), &(dst), NR_CPUS)
293static inline int __cpulist_parse(const char *buf, cpumask_t *dstp, int nbits)
294{
295 return bitmap_parselist(buf, dstp->bits, nbits);
296}
297
Paul Jacksonfb5eeee2005-10-30 15:02:33 -0800298#define cpu_remap(oldbit, old, new) \
299 __cpu_remap((oldbit), &(old), &(new), NR_CPUS)
300static inline int __cpu_remap(int oldbit,
301 const cpumask_t *oldp, const cpumask_t *newp, int nbits)
302{
303 return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
304}
305
306#define cpus_remap(dst, src, old, new) \
307 __cpus_remap(&(dst), &(src), &(old), &(new), NR_CPUS)
308static inline void __cpus_remap(cpumask_t *dstp, const cpumask_t *srcp,
309 const cpumask_t *oldp, const cpumask_t *newp, int nbits)
310{
311 bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
312}
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314#if NR_CPUS > 1
315#define for_each_cpu_mask(cpu, mask) \
316 for ((cpu) = first_cpu(mask); \
317 (cpu) < NR_CPUS; \
318 (cpu) = next_cpu((cpu), (mask)))
319#else /* NR_CPUS == 1 */
Andrew Morton9de9adb2006-06-25 05:48:10 -0700320#define for_each_cpu_mask(cpu, mask) \
321 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322#endif /* NR_CPUS */
323
324/*
325 * The following particular system cpumasks and operations manage
326 * possible, present and online cpus. Each of them is a fixed size
327 * bitmap of size NR_CPUS.
328 *
329 * #ifdef CONFIG_HOTPLUG_CPU
Andrew Morton7a8ef1c2006-02-10 01:51:08 -0800330 * cpu_possible_map - has bit 'cpu' set iff cpu is populatable
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 * cpu_present_map - has bit 'cpu' set iff cpu is populated
332 * cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
333 * #else
334 * cpu_possible_map - has bit 'cpu' set iff cpu is populated
335 * cpu_present_map - copy of cpu_possible_map
336 * cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
337 * #endif
338 *
339 * In either case, NR_CPUS is fixed at compile time, as the static
340 * size of these bitmaps. The cpu_possible_map is fixed at boot
341 * time, as the set of CPU id's that it is possible might ever
342 * be plugged in at anytime during the life of that system boot.
343 * The cpu_present_map is dynamic(*), representing which CPUs
344 * are currently plugged in. And cpu_online_map is the dynamic
345 * subset of cpu_present_map, indicating those CPUs available
346 * for scheduling.
347 *
348 * If HOTPLUG is enabled, then cpu_possible_map is forced to have
349 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
350 * ACPI reports present at boot.
351 *
352 * If HOTPLUG is enabled, then cpu_present_map varies dynamically,
353 * depending on what ACPI reports as currently plugged in, otherwise
354 * cpu_present_map is just a copy of cpu_possible_map.
355 *
356 * (*) Well, cpu_present_map is dynamic in the hotplug case. If not
357 * hotplug, it's a copy of cpu_possible_map, hence fixed at boot.
358 *
359 * Subtleties:
360 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
361 * assumption that their single CPU is online. The UP
362 * cpu_{online,possible,present}_maps are placebos. Changing them
363 * will have no useful affect on the following num_*_cpus()
364 * and cpu_*() macros in the UP case. This ugliness is a UP
365 * optimization - don't waste any instructions or memory references
366 * asking if you're online or how many CPUs there are if there is
367 * only one CPU.
368 * 2) Most SMP arch's #define some of these maps to be some
369 * other map specific to that arch. Therefore, the following
370 * must be #define macros, not inlines. To see why, examine
371 * the assembly code produced by the following. Note that
372 * set1() writes phys_x_map, but set2() writes x_map:
373 * int x_map, phys_x_map;
374 * #define set1(a) x_map = a
375 * inline void set2(int a) { x_map = a; }
376 * #define x_map phys_x_map
377 * main(){ set1(3); set2(5); }
378 */
379
380extern cpumask_t cpu_possible_map;
381extern cpumask_t cpu_online_map;
382extern cpumask_t cpu_present_map;
383
384#if NR_CPUS > 1
385#define num_online_cpus() cpus_weight(cpu_online_map)
386#define num_possible_cpus() cpus_weight(cpu_possible_map)
387#define num_present_cpus() cpus_weight(cpu_present_map)
388#define cpu_online(cpu) cpu_isset((cpu), cpu_online_map)
389#define cpu_possible(cpu) cpu_isset((cpu), cpu_possible_map)
390#define cpu_present(cpu) cpu_isset((cpu), cpu_present_map)
391#else
392#define num_online_cpus() 1
393#define num_possible_cpus() 1
394#define num_present_cpus() 1
395#define cpu_online(cpu) ((cpu) == 0)
396#define cpu_possible(cpu) ((cpu) == 0)
397#define cpu_present(cpu) ((cpu) == 0)
398#endif
399
Andrew Morton86302822006-03-25 03:08:09 -0800400#ifdef CONFIG_SMP
Christoph Lameter53b8a312007-02-20 13:57:51 -0800401extern int nr_cpu_ids;
Andrew Morton96a9b4d2006-03-25 03:08:10 -0800402#define any_online_cpu(mask) __any_online_cpu(&(mask))
403int __any_online_cpu(const cpumask_t *mask);
Andrew Morton86302822006-03-25 03:08:09 -0800404#else
Christoph Lameter53b8a312007-02-20 13:57:51 -0800405#define nr_cpu_ids 1
Andrew Morton96a9b4d2006-03-25 03:08:10 -0800406#define any_online_cpu(mask) 0
Andrew Morton86302822006-03-25 03:08:09 -0800407#endif
408
KAMEZAWA Hiroyuki631d6742006-03-28 01:56:36 -0800409#define for_each_possible_cpu(cpu) for_each_cpu_mask((cpu), cpu_possible_map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410#define for_each_online_cpu(cpu) for_each_cpu_mask((cpu), cpu_online_map)
411#define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413#endif /* __LINUX_CPUMASK_H */