Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #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 | * |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 8 | * The new cpumask_ ops take a "struct cpumask *"; the old ones |
| 9 | * use cpumask_t. |
| 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * See detailed comments in the file linux/bitmap.h describing the |
| 12 | * data type on which these cpumasks are based. |
| 13 | * |
Reinette Chatre | 01a3ee2 | 2006-10-11 01:21:55 -0700 | [diff] [blame] | 14 | * For details of cpumask_scnprintf() and cpumask_parse_user(), |
| 15 | * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * For details of cpulist_scnprintf() and cpulist_parse(), see |
| 17 | * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c. |
Paul Jackson | fb5eeee | 2005-10-30 15:02:33 -0800 | [diff] [blame] | 18 | * For details of cpu_remap(), see bitmap_bitremap in lib/bitmap.c |
| 19 | * For details of cpus_remap(), see bitmap_remap in lib/bitmap.c. |
Paul Jackson | 7ea931c | 2008-04-28 02:12:29 -0700 | [diff] [blame] | 20 | * For details of cpus_onto(), see bitmap_onto in lib/bitmap.c. |
| 21 | * For details of cpus_fold(), see bitmap_fold in lib/bitmap.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 23 | * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
| 24 | * Note: The alternate operations with the suffix "_nr" are used |
| 25 | * to limit the range of the loop to nr_cpu_ids instead of |
| 26 | * NR_CPUS when NR_CPUS > 64 for performance reasons. |
| 27 | * If NR_CPUS is <= 64 then most assembler bitmask |
| 28 | * operators execute faster with a constant range, so |
| 29 | * the operator will continue to use NR_CPUS. |
| 30 | * |
| 31 | * Another consideration is that nr_cpu_ids is initialized |
| 32 | * to NR_CPUS and isn't lowered until the possible cpus are |
| 33 | * discovered (including any disabled cpus). So early uses |
| 34 | * will span the entire range of NR_CPUS. |
| 35 | * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
| 36 | * |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 37 | * The obsolescent cpumask operations are: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * |
| 39 | * void cpu_set(cpu, mask) turn on bit 'cpu' in mask |
| 40 | * void cpu_clear(cpu, mask) turn off bit 'cpu' in mask |
| 41 | * void cpus_setall(mask) set all bits |
| 42 | * void cpus_clear(mask) clear all bits |
| 43 | * int cpu_isset(cpu, mask) true iff bit 'cpu' set in mask |
| 44 | * int cpu_test_and_set(cpu, mask) test and set bit 'cpu' in mask |
| 45 | * |
| 46 | * void cpus_and(dst, src1, src2) dst = src1 & src2 [intersection] |
| 47 | * void cpus_or(dst, src1, src2) dst = src1 | src2 [union] |
| 48 | * void cpus_xor(dst, src1, src2) dst = src1 ^ src2 |
| 49 | * void cpus_andnot(dst, src1, src2) dst = src1 & ~src2 |
| 50 | * void cpus_complement(dst, src) dst = ~src |
| 51 | * |
| 52 | * int cpus_equal(mask1, mask2) Does mask1 == mask2? |
| 53 | * int cpus_intersects(mask1, mask2) Do mask1 and mask2 intersect? |
| 54 | * int cpus_subset(mask1, mask2) Is mask1 a subset of mask2? |
| 55 | * int cpus_empty(mask) Is mask empty (no bits sets)? |
| 56 | * int cpus_full(mask) Is mask full (all bits sets)? |
| 57 | * int cpus_weight(mask) Hamming weigh - number of set bits |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 58 | * int cpus_weight_nr(mask) Same using nr_cpu_ids instead of NR_CPUS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * |
| 60 | * void cpus_shift_right(dst, src, n) Shift right |
| 61 | * void cpus_shift_left(dst, src, n) Shift left |
| 62 | * |
| 63 | * int first_cpu(mask) Number lowest set bit, or NR_CPUS |
| 64 | * int next_cpu(cpu, mask) Next cpu past 'cpu', or NR_CPUS |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 65 | * int next_cpu_nr(cpu, mask) Next cpu past 'cpu', or nr_cpu_ids |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * |
| 67 | * cpumask_t cpumask_of_cpu(cpu) Return cpumask with bit 'cpu' set |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 68 | * (can be used as an lvalue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * CPU_MASK_ALL Initializer - all bits set |
| 70 | * CPU_MASK_NONE Initializer - no bits set |
| 71 | * unsigned long *cpus_addr(mask) Array of unsigned long's in mask |
| 72 | * |
Mike Travis | 80422d3 | 2008-07-18 18:11:33 -0700 | [diff] [blame] | 73 | * CPUMASK_ALLOC kmalloc's a structure that is a composite of many cpumask_t |
| 74 | * variables, and CPUMASK_PTR provides pointers to each field. |
| 75 | * |
| 76 | * The structure should be defined something like this: |
| 77 | * struct my_cpumasks { |
| 78 | * cpumask_t mask1; |
| 79 | * cpumask_t mask2; |
| 80 | * }; |
| 81 | * |
| 82 | * Usage is then: |
| 83 | * CPUMASK_ALLOC(my_cpumasks); |
| 84 | * CPUMASK_PTR(mask1, my_cpumasks); |
| 85 | * CPUMASK_PTR(mask2, my_cpumasks); |
| 86 | * |
| 87 | * --- DO NOT reference cpumask_t pointers until this check --- |
| 88 | * if (my_cpumasks == NULL) |
| 89 | * "kmalloc failed"... |
| 90 | * |
| 91 | * References are now pointers to the cpumask_t variables (*mask1, ...) |
| 92 | * |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 93 | *if NR_CPUS > BITS_PER_LONG |
| 94 | * CPUMASK_ALLOC(m) Declares and allocates struct m *m = |
Mike Travis | 80422d3 | 2008-07-18 18:11:33 -0700 | [diff] [blame] | 95 | * kmalloc(sizeof(*m), GFP_KERNEL) |
| 96 | * CPUMASK_FREE(m) Macro for kfree(m) |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 97 | *else |
| 98 | * CPUMASK_ALLOC(m) Declares struct m _m, *m = &_m |
| 99 | * CPUMASK_FREE(m) Nop |
| 100 | *endif |
Mike Travis | 80422d3 | 2008-07-18 18:11:33 -0700 | [diff] [blame] | 101 | * CPUMASK_PTR(v, m) Declares cpumask_t *v = &(m->v) |
| 102 | * ------------------------------------------------------------------------ |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 103 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing |
Reinette Chatre | 01a3ee2 | 2006-10-11 01:21:55 -0700 | [diff] [blame] | 105 | * int cpumask_parse_user(ubuf, ulen, mask) Parse ascii string as cpumask |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | * int cpulist_scnprintf(buf, len, mask) Format cpumask as list for printing |
| 107 | * int cpulist_parse(buf, map) Parse ascii string as cpulist |
Paul Jackson | fb5eeee | 2005-10-30 15:02:33 -0800 | [diff] [blame] | 108 | * int cpu_remap(oldbit, old, new) newbit = map(old, new)(oldbit) |
Paul Jackson | 7ea931c | 2008-04-28 02:12:29 -0700 | [diff] [blame] | 109 | * void cpus_remap(dst, src, old, new) *dst = map(old, new)(src) |
| 110 | * void cpus_onto(dst, orig, relmap) *dst = orig relative to relmap |
| 111 | * void cpus_fold(dst, orig, sz) dst bits = orig bits mod sz |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | * |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 113 | * for_each_cpu_mask(cpu, mask) for-loop cpu over mask using NR_CPUS |
| 114 | * for_each_cpu_mask_nr(cpu, mask) for-loop cpu over mask using nr_cpu_ids |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | * |
| 116 | * int num_online_cpus() Number of online CPUs |
| 117 | * int num_possible_cpus() Number of all possible CPUs |
| 118 | * int num_present_cpus() Number of present CPUs |
| 119 | * |
| 120 | * int cpu_online(cpu) Is some cpu online? |
| 121 | * int cpu_possible(cpu) Is some cpu possible? |
| 122 | * int cpu_present(cpu) Is some cpu present (can schedule)? |
| 123 | * |
| 124 | * int any_online_cpu(mask) First online cpu in mask |
| 125 | * |
KAMEZAWA Hiroyuki | 631d674 | 2006-03-28 01:56:36 -0800 | [diff] [blame] | 126 | * for_each_possible_cpu(cpu) for-loop cpu over cpu_possible_map |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | * for_each_online_cpu(cpu) for-loop cpu over cpu_online_map |
| 128 | * for_each_present_cpu(cpu) for-loop cpu over cpu_present_map |
| 129 | * |
| 130 | * Subtlety: |
| 131 | * 1) The 'type-checked' form of cpu_isset() causes gcc (3.3.2, anyway) |
| 132 | * to generate slightly worse code. Note for example the additional |
| 133 | * 40 lines of assembly code compiling the "for each possible cpu" |
| 134 | * loops buried in the disk_stat_read() macros calls when compiling |
| 135 | * drivers/block/genhd.c (arch i386, CONFIG_SMP=y). So use a simple |
| 136 | * one-line #define for cpu_isset(), instead of wrapping an inline |
| 137 | * inside a macro, the way we do the other calls. |
| 138 | */ |
| 139 | |
| 140 | #include <linux/kernel.h> |
| 141 | #include <linux/threads.h> |
| 142 | #include <linux/bitmap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 144 | typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | extern cpumask_t _unused_cpumask_arg_; |
| 146 | |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 147 | #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) |
| 149 | static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) |
| 150 | { |
| 151 | set_bit(cpu, dstp->bits); |
| 152 | } |
| 153 | |
| 154 | #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) |
| 155 | static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) |
| 156 | { |
| 157 | clear_bit(cpu, dstp->bits); |
| 158 | } |
| 159 | |
| 160 | #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) |
| 161 | static inline void __cpus_setall(cpumask_t *dstp, int nbits) |
| 162 | { |
| 163 | bitmap_fill(dstp->bits, nbits); |
| 164 | } |
| 165 | |
| 166 | #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) |
| 167 | static inline void __cpus_clear(cpumask_t *dstp, int nbits) |
| 168 | { |
| 169 | bitmap_zero(dstp->bits, nbits); |
| 170 | } |
| 171 | |
| 172 | /* No static inline type checking - see Subtlety (1) above. */ |
| 173 | #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits) |
| 174 | |
| 175 | #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) |
| 176 | static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) |
| 177 | { |
| 178 | return test_and_set_bit(cpu, addr->bits); |
| 179 | } |
| 180 | |
| 181 | #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) |
| 182 | static inline void __cpus_and(cpumask_t *dstp, const cpumask_t *src1p, |
| 183 | const cpumask_t *src2p, int nbits) |
| 184 | { |
| 185 | bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); |
| 186 | } |
| 187 | |
| 188 | #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) |
| 189 | static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p, |
| 190 | const cpumask_t *src2p, int nbits) |
| 191 | { |
| 192 | bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); |
| 193 | } |
| 194 | |
| 195 | #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) |
| 196 | static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p, |
| 197 | const cpumask_t *src2p, int nbits) |
| 198 | { |
| 199 | bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); |
| 200 | } |
| 201 | |
| 202 | #define cpus_andnot(dst, src1, src2) \ |
| 203 | __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) |
| 204 | static inline void __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p, |
| 205 | const cpumask_t *src2p, int nbits) |
| 206 | { |
| 207 | bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); |
| 208 | } |
| 209 | |
| 210 | #define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS) |
| 211 | static inline void __cpus_complement(cpumask_t *dstp, |
| 212 | const cpumask_t *srcp, int nbits) |
| 213 | { |
| 214 | bitmap_complement(dstp->bits, srcp->bits, nbits); |
| 215 | } |
| 216 | |
| 217 | #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) |
| 218 | static inline int __cpus_equal(const cpumask_t *src1p, |
| 219 | const cpumask_t *src2p, int nbits) |
| 220 | { |
| 221 | return bitmap_equal(src1p->bits, src2p->bits, nbits); |
| 222 | } |
| 223 | |
| 224 | #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) |
| 225 | static inline int __cpus_intersects(const cpumask_t *src1p, |
| 226 | const cpumask_t *src2p, int nbits) |
| 227 | { |
| 228 | return bitmap_intersects(src1p->bits, src2p->bits, nbits); |
| 229 | } |
| 230 | |
| 231 | #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) |
| 232 | static inline int __cpus_subset(const cpumask_t *src1p, |
| 233 | const cpumask_t *src2p, int nbits) |
| 234 | { |
| 235 | return bitmap_subset(src1p->bits, src2p->bits, nbits); |
| 236 | } |
| 237 | |
| 238 | #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) |
| 239 | static inline int __cpus_empty(const cpumask_t *srcp, int nbits) |
| 240 | { |
| 241 | return bitmap_empty(srcp->bits, nbits); |
| 242 | } |
| 243 | |
| 244 | #define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS) |
| 245 | static inline int __cpus_full(const cpumask_t *srcp, int nbits) |
| 246 | { |
| 247 | return bitmap_full(srcp->bits, nbits); |
| 248 | } |
| 249 | |
| 250 | #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) |
| 251 | static inline int __cpus_weight(const cpumask_t *srcp, int nbits) |
| 252 | { |
| 253 | return bitmap_weight(srcp->bits, nbits); |
| 254 | } |
| 255 | |
| 256 | #define cpus_shift_right(dst, src, n) \ |
| 257 | __cpus_shift_right(&(dst), &(src), (n), NR_CPUS) |
| 258 | static inline void __cpus_shift_right(cpumask_t *dstp, |
| 259 | const cpumask_t *srcp, int n, int nbits) |
| 260 | { |
| 261 | bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); |
| 262 | } |
| 263 | |
| 264 | #define cpus_shift_left(dst, src, n) \ |
| 265 | __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) |
| 266 | static inline void __cpus_shift_left(cpumask_t *dstp, |
| 267 | const cpumask_t *srcp, int n, int nbits) |
| 268 | { |
| 269 | bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); |
| 270 | } |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 271 | #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 273 | /** |
| 274 | * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * |
| 275 | * @bitmap: the bitmap |
| 276 | * |
| 277 | * There are a few places where cpumask_var_t isn't appropriate and |
| 278 | * static cpumasks must be used (eg. very early boot), yet we don't |
| 279 | * expose the definition of 'struct cpumask'. |
| 280 | * |
| 281 | * This does the conversion, and can be used as a constant initializer. |
| 282 | */ |
| 283 | #define to_cpumask(bitmap) \ |
| 284 | ((struct cpumask *)(1 ? (bitmap) \ |
| 285 | : (void *)sizeof(__check_is_bitmap(bitmap)))) |
| 286 | |
| 287 | static inline int __check_is_bitmap(const unsigned long *bitmap) |
| 288 | { |
| 289 | return 1; |
| 290 | } |
| 291 | |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 292 | /* |
| 293 | * Special-case data structure for "single bit set only" constant CPU masks. |
| 294 | * |
| 295 | * We pre-generate all the 64 (or 32) possible bit positions, with enough |
| 296 | * padding to the left and the right, and return the constant pointer |
| 297 | * appropriately offset. |
| 298 | */ |
| 299 | extern const unsigned long |
| 300 | cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 302 | static inline const struct cpumask *get_cpu_mask(unsigned int cpu) |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 303 | { |
| 304 | const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; |
| 305 | p -= cpu / BITS_PER_LONG; |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 306 | return to_cpumask(p); |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 307 | } |
| 308 | |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 309 | #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 310 | /* |
| 311 | * In cases where we take the address of the cpumask immediately, |
| 312 | * gcc optimizes it out (it's a constant) and there's no huge stack |
| 313 | * variable created: |
| 314 | */ |
Stephen Rothwell | 3dd730f | 2008-07-29 16:07:37 +1000 | [diff] [blame] | 315 | #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu)) |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS) |
| 319 | |
| 320 | #if NR_CPUS <= BITS_PER_LONG |
| 321 | |
| 322 | #define CPU_MASK_ALL \ |
| 323 | (cpumask_t) { { \ |
| 324 | [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ |
| 325 | } } |
| 326 | |
Mike Travis | 321a8e9 | 2008-04-04 18:11:02 -0700 | [diff] [blame] | 327 | #define CPU_MASK_ALL_PTR (&CPU_MASK_ALL) |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | #else |
| 330 | |
| 331 | #define CPU_MASK_ALL \ |
| 332 | (cpumask_t) { { \ |
| 333 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ |
| 334 | [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ |
| 335 | } } |
| 336 | |
Mike Travis | 321a8e9 | 2008-04-04 18:11:02 -0700 | [diff] [blame] | 337 | /* cpu_mask_all is in init/main.c */ |
| 338 | extern cpumask_t cpu_mask_all; |
| 339 | #define CPU_MASK_ALL_PTR (&cpu_mask_all) |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | #endif |
| 342 | |
| 343 | #define CPU_MASK_NONE \ |
| 344 | (cpumask_t) { { \ |
| 345 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ |
| 346 | } } |
| 347 | |
| 348 | #define CPU_MASK_CPU0 \ |
| 349 | (cpumask_t) { { \ |
| 350 | [0] = 1UL \ |
| 351 | } } |
| 352 | |
| 353 | #define cpus_addr(src) ((src).bits) |
| 354 | |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 355 | #if NR_CPUS > BITS_PER_LONG |
| 356 | #define CPUMASK_ALLOC(m) struct m *m = kmalloc(sizeof(*m), GFP_KERNEL) |
| 357 | #define CPUMASK_FREE(m) kfree(m) |
| 358 | #else |
Mike Travis | 80422d3 | 2008-07-18 18:11:33 -0700 | [diff] [blame] | 359 | #define CPUMASK_ALLOC(m) struct m _m, *m = &_m |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 360 | #define CPUMASK_FREE(m) |
| 361 | #endif |
Mike Travis | 80422d3 | 2008-07-18 18:11:33 -0700 | [diff] [blame] | 362 | #define CPUMASK_PTR(v, m) cpumask_t *v = &(m->v) |
Mike Travis | 77586c2 | 2008-07-15 14:14:36 -0700 | [diff] [blame] | 363 | |
Paul Jackson | fb5eeee | 2005-10-30 15:02:33 -0800 | [diff] [blame] | 364 | #define cpu_remap(oldbit, old, new) \ |
| 365 | __cpu_remap((oldbit), &(old), &(new), NR_CPUS) |
| 366 | static inline int __cpu_remap(int oldbit, |
| 367 | const cpumask_t *oldp, const cpumask_t *newp, int nbits) |
| 368 | { |
| 369 | return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits); |
| 370 | } |
| 371 | |
| 372 | #define cpus_remap(dst, src, old, new) \ |
| 373 | __cpus_remap(&(dst), &(src), &(old), &(new), NR_CPUS) |
| 374 | static inline void __cpus_remap(cpumask_t *dstp, const cpumask_t *srcp, |
| 375 | const cpumask_t *oldp, const cpumask_t *newp, int nbits) |
| 376 | { |
| 377 | bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits); |
| 378 | } |
| 379 | |
Paul Jackson | 7ea931c | 2008-04-28 02:12:29 -0700 | [diff] [blame] | 380 | #define cpus_onto(dst, orig, relmap) \ |
| 381 | __cpus_onto(&(dst), &(orig), &(relmap), NR_CPUS) |
| 382 | static inline void __cpus_onto(cpumask_t *dstp, const cpumask_t *origp, |
| 383 | const cpumask_t *relmapp, int nbits) |
| 384 | { |
| 385 | bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits); |
| 386 | } |
| 387 | |
| 388 | #define cpus_fold(dst, orig, sz) \ |
| 389 | __cpus_fold(&(dst), &(orig), sz, NR_CPUS) |
| 390 | static inline void __cpus_fold(cpumask_t *dstp, const cpumask_t *origp, |
| 391 | int sz, int nbits) |
| 392 | { |
| 393 | bitmap_fold(dstp->bits, origp->bits, sz, nbits); |
| 394 | } |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 395 | #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ |
Paul Jackson | 7ea931c | 2008-04-28 02:12:29 -0700 | [diff] [blame] | 396 | |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 397 | #if NR_CPUS == 1 |
| 398 | |
| 399 | #define nr_cpu_ids 1 |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 400 | #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 401 | #define first_cpu(src) ({ (void)(src); 0; }) |
| 402 | #define next_cpu(n, src) ({ (void)(src); 1; }) |
| 403 | #define any_online_cpu(mask) 0 |
| 404 | #define for_each_cpu_mask(cpu, mask) \ |
| 405 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 406 | #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 407 | #else /* NR_CPUS > 1 */ |
| 408 | |
| 409 | extern int nr_cpu_ids; |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 410 | #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 411 | int __first_cpu(const cpumask_t *srcp); |
| 412 | int __next_cpu(int n, const cpumask_t *srcp); |
| 413 | int __any_online_cpu(const cpumask_t *mask); |
| 414 | |
| 415 | #define first_cpu(src) __first_cpu(&(src)) |
| 416 | #define next_cpu(n, src) __next_cpu((n), &(src)) |
| 417 | #define any_online_cpu(mask) __any_online_cpu(&(mask)) |
Alexander van Heukelum | 7baac8b | 2008-05-13 11:28:21 +0200 | [diff] [blame] | 418 | #define for_each_cpu_mask(cpu, mask) \ |
| 419 | for ((cpu) = -1; \ |
| 420 | (cpu) = next_cpu((cpu), (mask)), \ |
| 421 | (cpu) < NR_CPUS; ) |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 422 | #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 423 | #endif |
| 424 | |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 425 | #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 426 | #if NR_CPUS <= 64 |
| 427 | |
| 428 | #define next_cpu_nr(n, src) next_cpu(n, src) |
| 429 | #define cpus_weight_nr(cpumask) cpus_weight(cpumask) |
| 430 | #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask) |
| 431 | |
| 432 | #else /* NR_CPUS > 64 */ |
| 433 | |
| 434 | int __next_cpu_nr(int n, const cpumask_t *srcp); |
| 435 | #define next_cpu_nr(n, src) __next_cpu_nr((n), &(src)) |
| 436 | #define cpus_weight_nr(cpumask) __cpus_weight(&(cpumask), nr_cpu_ids) |
Alexander van Heukelum | 7baac8b | 2008-05-13 11:28:21 +0200 | [diff] [blame] | 437 | #define for_each_cpu_mask_nr(cpu, mask) \ |
| 438 | for ((cpu) = -1; \ |
| 439 | (cpu) = next_cpu_nr((cpu), (mask)), \ |
| 440 | (cpu) < nr_cpu_ids; ) |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 441 | |
| 442 | #endif /* NR_CPUS > 64 */ |
Rusty Russell | 8c384cd | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 443 | #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | /* |
| 446 | * The following particular system cpumasks and operations manage |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 447 | * possible, present, active and online cpus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | * |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 449 | * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable |
| 450 | * cpu_present_mask - has bit 'cpu' set iff cpu is populated |
| 451 | * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler |
| 452 | * cpu_active_mask - has bit 'cpu' set iff cpu available to migration |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | * |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 454 | * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | * |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 456 | * The cpu_possible_mask is fixed at boot time, as the set of CPU id's |
| 457 | * that it is possible might ever be plugged in at anytime during the |
| 458 | * life of that system boot. The cpu_present_mask is dynamic(*), |
| 459 | * representing which CPUs are currently plugged in. And |
| 460 | * cpu_online_mask is the dynamic subset of cpu_present_mask, |
| 461 | * indicating those CPUs available for scheduling. |
| 462 | * |
| 463 | * If HOTPLUG is enabled, then cpu_possible_mask is forced to have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | * all NR_CPUS bits set, otherwise it is just the set of CPUs that |
| 465 | * ACPI reports present at boot. |
| 466 | * |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 467 | * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | * depending on what ACPI reports as currently plugged in, otherwise |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 469 | * cpu_present_mask is just a copy of cpu_possible_mask. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | * |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 471 | * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not |
| 472 | * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | * |
| 474 | * Subtleties: |
| 475 | * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode |
| 476 | * assumption that their single CPU is online. The UP |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 477 | * cpu_{online,possible,present}_masks are placebos. Changing them |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | * will have no useful affect on the following num_*_cpus() |
| 479 | * and cpu_*() macros in the UP case. This ugliness is a UP |
| 480 | * optimization - don't waste any instructions or memory references |
| 481 | * asking if you're online or how many CPUs there are if there is |
| 482 | * only one CPU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | */ |
| 484 | |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 485 | extern const struct cpumask *const cpu_possible_mask; |
| 486 | extern const struct cpumask *const cpu_online_mask; |
| 487 | extern const struct cpumask *const cpu_present_mask; |
| 488 | extern const struct cpumask *const cpu_active_mask; |
| 489 | |
| 490 | /* These strip const, as traditionally they weren't const. */ |
| 491 | #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask) |
| 492 | #define cpu_online_map (*(cpumask_t *)cpu_online_mask) |
| 493 | #define cpu_present_map (*(cpumask_t *)cpu_present_mask) |
| 494 | #define cpu_active_map (*(cpumask_t *)cpu_active_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
| 496 | #if NR_CPUS > 1 |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 497 | #define num_online_cpus() cpumask_weight(cpu_online_mask) |
| 498 | #define num_possible_cpus() cpumask_weight(cpu_possible_mask) |
| 499 | #define num_present_cpus() cpumask_weight(cpu_present_mask) |
| 500 | #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) |
| 501 | #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) |
| 502 | #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) |
| 503 | #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | #else |
| 505 | #define num_online_cpus() 1 |
| 506 | #define num_possible_cpus() 1 |
| 507 | #define num_present_cpus() 1 |
| 508 | #define cpu_online(cpu) ((cpu) == 0) |
| 509 | #define cpu_possible(cpu) ((cpu) == 0) |
| 510 | #define cpu_present(cpu) ((cpu) == 0) |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 511 | #define cpu_active(cpu) ((cpu) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | #endif |
| 513 | |
Ingo Molnar | a263898 | 2007-12-30 11:58:17 +0100 | [diff] [blame] | 514 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) |
| 515 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 516 | /* These are the new versions of the cpumask operators: passed by pointer. |
| 517 | * The older versions will be implemented in terms of these, then deleted. */ |
| 518 | #define cpumask_bits(maskp) ((maskp)->bits) |
| 519 | |
| 520 | #if NR_CPUS <= BITS_PER_LONG |
| 521 | #define CPU_BITS_ALL \ |
| 522 | { \ |
| 523 | [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ |
| 524 | } |
| 525 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 526 | #else /* NR_CPUS > BITS_PER_LONG */ |
| 527 | |
| 528 | #define CPU_BITS_ALL \ |
| 529 | { \ |
| 530 | [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ |
| 531 | [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ |
| 532 | } |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 533 | #endif /* NR_CPUS > BITS_PER_LONG */ |
| 534 | |
Rusty Russell | 7be7585 | 2008-12-13 21:20:28 +1030 | [diff] [blame] | 535 | #ifdef CONFIG_CPUMASK_OFFSTACK |
| 536 | /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also, |
| 537 | * not all bits may be allocated. */ |
| 538 | #define nr_cpumask_bits nr_cpu_ids |
| 539 | #else |
| 540 | #define nr_cpumask_bits NR_CPUS |
| 541 | #endif |
| 542 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 543 | /* verify cpu argument to cpumask_* operators */ |
| 544 | static inline unsigned int cpumask_check(unsigned int cpu) |
| 545 | { |
| 546 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| 547 | WARN_ON_ONCE(cpu >= nr_cpumask_bits); |
| 548 | #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ |
| 549 | return cpu; |
| 550 | } |
| 551 | |
| 552 | #if NR_CPUS == 1 |
Rusty Russell | 984f2f3 | 2008-11-08 20:24:19 +1100 | [diff] [blame] | 553 | /* Uniprocessor. Assume all masks are "1". */ |
| 554 | static inline unsigned int cpumask_first(const struct cpumask *srcp) |
| 555 | { |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | /* Valid inputs for n are -1 and 0. */ |
| 560 | static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) |
| 561 | { |
| 562 | return n+1; |
| 563 | } |
| 564 | |
| 565 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) |
| 566 | { |
| 567 | return n+1; |
| 568 | } |
| 569 | |
| 570 | static inline unsigned int cpumask_next_and(int n, |
| 571 | const struct cpumask *srcp, |
| 572 | const struct cpumask *andp) |
| 573 | { |
| 574 | return n+1; |
| 575 | } |
| 576 | |
| 577 | /* cpu must be a valid cpu, ie 0, so there's no other choice. */ |
| 578 | static inline unsigned int cpumask_any_but(const struct cpumask *mask, |
| 579 | unsigned int cpu) |
| 580 | { |
| 581 | return 1; |
| 582 | } |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 583 | |
| 584 | #define for_each_cpu(cpu, mask) \ |
| 585 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) |
| 586 | #define for_each_cpu_and(cpu, mask, and) \ |
| 587 | for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) |
| 588 | #else |
| 589 | /** |
| 590 | * cpumask_first - get the first cpu in a cpumask |
| 591 | * @srcp: the cpumask pointer |
| 592 | * |
| 593 | * Returns >= nr_cpu_ids if no cpus set. |
| 594 | */ |
| 595 | static inline unsigned int cpumask_first(const struct cpumask *srcp) |
| 596 | { |
| 597 | return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * cpumask_next - get the next cpu in a cpumask |
| 602 | * @n: the cpu prior to the place to search (ie. return will be > @n) |
| 603 | * @srcp: the cpumask pointer |
| 604 | * |
| 605 | * Returns >= nr_cpu_ids if no further cpus set. |
| 606 | */ |
| 607 | static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) |
| 608 | { |
| 609 | /* -1 is a legal arg here. */ |
| 610 | if (n != -1) |
| 611 | cpumask_check(n); |
| 612 | return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); |
| 613 | } |
| 614 | |
| 615 | /** |
| 616 | * cpumask_next_zero - get the next unset cpu in a cpumask |
| 617 | * @n: the cpu prior to the place to search (ie. return will be > @n) |
| 618 | * @srcp: the cpumask pointer |
| 619 | * |
| 620 | * Returns >= nr_cpu_ids if no further cpus unset. |
| 621 | */ |
| 622 | static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) |
| 623 | { |
| 624 | /* -1 is a legal arg here. */ |
| 625 | if (n != -1) |
| 626 | cpumask_check(n); |
| 627 | return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); |
| 628 | } |
| 629 | |
| 630 | int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); |
| 631 | int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); |
| 632 | |
Rusty Russell | 984f2f3 | 2008-11-08 20:24:19 +1100 | [diff] [blame] | 633 | /** |
| 634 | * for_each_cpu - iterate over every cpu in a mask |
| 635 | * @cpu: the (optionally unsigned) integer iterator |
| 636 | * @mask: the cpumask pointer |
| 637 | * |
| 638 | * After the loop, cpu is >= nr_cpu_ids. |
| 639 | */ |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 640 | #define for_each_cpu(cpu, mask) \ |
| 641 | for ((cpu) = -1; \ |
| 642 | (cpu) = cpumask_next((cpu), (mask)), \ |
| 643 | (cpu) < nr_cpu_ids;) |
Rusty Russell | 984f2f3 | 2008-11-08 20:24:19 +1100 | [diff] [blame] | 644 | |
| 645 | /** |
| 646 | * for_each_cpu_and - iterate over every cpu in both masks |
| 647 | * @cpu: the (optionally unsigned) integer iterator |
| 648 | * @mask: the first cpumask pointer |
| 649 | * @and: the second cpumask pointer |
| 650 | * |
| 651 | * This saves a temporary CPU mask in many places. It is equivalent to: |
| 652 | * struct cpumask tmp; |
| 653 | * cpumask_and(&tmp, &mask, &and); |
| 654 | * for_each_cpu(cpu, &tmp) |
| 655 | * ... |
| 656 | * |
| 657 | * After the loop, cpu is >= nr_cpu_ids. |
| 658 | */ |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 659 | #define for_each_cpu_and(cpu, mask, and) \ |
| 660 | for ((cpu) = -1; \ |
| 661 | (cpu) = cpumask_next_and((cpu), (mask), (and)), \ |
| 662 | (cpu) < nr_cpu_ids;) |
| 663 | #endif /* SMP */ |
| 664 | |
| 665 | #define CPU_BITS_NONE \ |
| 666 | { \ |
| 667 | [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ |
| 668 | } |
| 669 | |
| 670 | #define CPU_BITS_CPU0 \ |
| 671 | { \ |
| 672 | [0] = 1UL \ |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * cpumask_set_cpu - set a cpu in a cpumask |
| 677 | * @cpu: cpu number (< nr_cpu_ids) |
| 678 | * @dstp: the cpumask pointer |
| 679 | */ |
| 680 | static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) |
| 681 | { |
| 682 | set_bit(cpumask_check(cpu), cpumask_bits(dstp)); |
| 683 | } |
| 684 | |
| 685 | /** |
| 686 | * cpumask_clear_cpu - clear a cpu in a cpumask |
| 687 | * @cpu: cpu number (< nr_cpu_ids) |
| 688 | * @dstp: the cpumask pointer |
| 689 | */ |
| 690 | static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) |
| 691 | { |
| 692 | clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); |
| 693 | } |
| 694 | |
| 695 | /** |
| 696 | * cpumask_test_cpu - test for a cpu in a cpumask |
| 697 | * @cpu: cpu number (< nr_cpu_ids) |
| 698 | * @cpumask: the cpumask pointer |
| 699 | * |
| 700 | * No static inline type checking - see Subtlety (1) above. |
| 701 | */ |
| 702 | #define cpumask_test_cpu(cpu, cpumask) \ |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 703 | test_bit(cpumask_check(cpu), cpumask_bits((cpumask))) |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 704 | |
| 705 | /** |
| 706 | * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask |
| 707 | * @cpu: cpu number (< nr_cpu_ids) |
| 708 | * @cpumask: the cpumask pointer |
| 709 | * |
| 710 | * test_and_set_bit wrapper for cpumasks. |
| 711 | */ |
| 712 | static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) |
| 713 | { |
| 714 | return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); |
| 715 | } |
| 716 | |
| 717 | /** |
| 718 | * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask |
| 719 | * @dstp: the cpumask pointer |
| 720 | */ |
| 721 | static inline void cpumask_setall(struct cpumask *dstp) |
| 722 | { |
| 723 | bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); |
| 724 | } |
| 725 | |
| 726 | /** |
| 727 | * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask |
| 728 | * @dstp: the cpumask pointer |
| 729 | */ |
| 730 | static inline void cpumask_clear(struct cpumask *dstp) |
| 731 | { |
| 732 | bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); |
| 733 | } |
| 734 | |
| 735 | /** |
| 736 | * cpumask_and - *dstp = *src1p & *src2p |
| 737 | * @dstp: the cpumask result |
| 738 | * @src1p: the first input |
| 739 | * @src2p: the second input |
| 740 | */ |
| 741 | static inline void cpumask_and(struct cpumask *dstp, |
| 742 | const struct cpumask *src1p, |
| 743 | const struct cpumask *src2p) |
| 744 | { |
| 745 | bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), |
| 746 | cpumask_bits(src2p), nr_cpumask_bits); |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * cpumask_or - *dstp = *src1p | *src2p |
| 751 | * @dstp: the cpumask result |
| 752 | * @src1p: the first input |
| 753 | * @src2p: the second input |
| 754 | */ |
| 755 | static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, |
| 756 | const struct cpumask *src2p) |
| 757 | { |
| 758 | bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), |
| 759 | cpumask_bits(src2p), nr_cpumask_bits); |
| 760 | } |
| 761 | |
| 762 | /** |
| 763 | * cpumask_xor - *dstp = *src1p ^ *src2p |
| 764 | * @dstp: the cpumask result |
| 765 | * @src1p: the first input |
| 766 | * @src2p: the second input |
| 767 | */ |
| 768 | static inline void cpumask_xor(struct cpumask *dstp, |
| 769 | const struct cpumask *src1p, |
| 770 | const struct cpumask *src2p) |
| 771 | { |
| 772 | bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), |
| 773 | cpumask_bits(src2p), nr_cpumask_bits); |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * cpumask_andnot - *dstp = *src1p & ~*src2p |
| 778 | * @dstp: the cpumask result |
| 779 | * @src1p: the first input |
| 780 | * @src2p: the second input |
| 781 | */ |
| 782 | static inline void cpumask_andnot(struct cpumask *dstp, |
| 783 | const struct cpumask *src1p, |
| 784 | const struct cpumask *src2p) |
| 785 | { |
| 786 | bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), |
| 787 | cpumask_bits(src2p), nr_cpumask_bits); |
| 788 | } |
| 789 | |
| 790 | /** |
| 791 | * cpumask_complement - *dstp = ~*srcp |
| 792 | * @dstp: the cpumask result |
| 793 | * @srcp: the input to invert |
| 794 | */ |
| 795 | static inline void cpumask_complement(struct cpumask *dstp, |
| 796 | const struct cpumask *srcp) |
| 797 | { |
| 798 | bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), |
| 799 | nr_cpumask_bits); |
| 800 | } |
| 801 | |
| 802 | /** |
| 803 | * cpumask_equal - *src1p == *src2p |
| 804 | * @src1p: the first input |
| 805 | * @src2p: the second input |
| 806 | */ |
| 807 | static inline bool cpumask_equal(const struct cpumask *src1p, |
| 808 | const struct cpumask *src2p) |
| 809 | { |
| 810 | return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), |
| 811 | nr_cpumask_bits); |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * cpumask_intersects - (*src1p & *src2p) != 0 |
| 816 | * @src1p: the first input |
| 817 | * @src2p: the second input |
| 818 | */ |
| 819 | static inline bool cpumask_intersects(const struct cpumask *src1p, |
| 820 | const struct cpumask *src2p) |
| 821 | { |
| 822 | return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), |
| 823 | nr_cpumask_bits); |
| 824 | } |
| 825 | |
| 826 | /** |
| 827 | * cpumask_subset - (*src1p & ~*src2p) == 0 |
| 828 | * @src1p: the first input |
| 829 | * @src2p: the second input |
| 830 | */ |
| 831 | static inline int cpumask_subset(const struct cpumask *src1p, |
| 832 | const struct cpumask *src2p) |
| 833 | { |
| 834 | return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), |
| 835 | nr_cpumask_bits); |
| 836 | } |
| 837 | |
| 838 | /** |
| 839 | * cpumask_empty - *srcp == 0 |
| 840 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. |
| 841 | */ |
| 842 | static inline bool cpumask_empty(const struct cpumask *srcp) |
| 843 | { |
| 844 | return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * cpumask_full - *srcp == 0xFFFFFFFF... |
| 849 | * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. |
| 850 | */ |
| 851 | static inline bool cpumask_full(const struct cpumask *srcp) |
| 852 | { |
| 853 | return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); |
| 854 | } |
| 855 | |
| 856 | /** |
| 857 | * cpumask_weight - Count of bits in *srcp |
| 858 | * @srcp: the cpumask to count bits (< nr_cpu_ids) in. |
| 859 | */ |
| 860 | static inline unsigned int cpumask_weight(const struct cpumask *srcp) |
| 861 | { |
| 862 | return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); |
| 863 | } |
| 864 | |
| 865 | /** |
| 866 | * cpumask_shift_right - *dstp = *srcp >> n |
| 867 | * @dstp: the cpumask result |
| 868 | * @srcp: the input to shift |
| 869 | * @n: the number of bits to shift by |
| 870 | */ |
| 871 | static inline void cpumask_shift_right(struct cpumask *dstp, |
| 872 | const struct cpumask *srcp, int n) |
| 873 | { |
| 874 | bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, |
| 875 | nr_cpumask_bits); |
| 876 | } |
| 877 | |
| 878 | /** |
| 879 | * cpumask_shift_left - *dstp = *srcp << n |
| 880 | * @dstp: the cpumask result |
| 881 | * @srcp: the input to shift |
| 882 | * @n: the number of bits to shift by |
| 883 | */ |
| 884 | static inline void cpumask_shift_left(struct cpumask *dstp, |
| 885 | const struct cpumask *srcp, int n) |
| 886 | { |
| 887 | bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, |
| 888 | nr_cpumask_bits); |
| 889 | } |
| 890 | |
| 891 | /** |
| 892 | * cpumask_copy - *dstp = *srcp |
| 893 | * @dstp: the result |
| 894 | * @srcp: the input cpumask |
| 895 | */ |
| 896 | static inline void cpumask_copy(struct cpumask *dstp, |
| 897 | const struct cpumask *srcp) |
| 898 | { |
| 899 | bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); |
| 900 | } |
| 901 | |
| 902 | /** |
| 903 | * cpumask_any - pick a "random" cpu from *srcp |
| 904 | * @srcp: the input cpumask |
| 905 | * |
| 906 | * Returns >= nr_cpu_ids if no cpus set. |
| 907 | */ |
| 908 | #define cpumask_any(srcp) cpumask_first(srcp) |
| 909 | |
| 910 | /** |
| 911 | * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 |
| 912 | * @src1p: the first input |
| 913 | * @src2p: the second input |
| 914 | * |
| 915 | * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). |
| 916 | */ |
| 917 | #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) |
| 918 | |
| 919 | /** |
| 920 | * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 |
| 921 | * @mask1: the first input cpumask |
| 922 | * @mask2: the second input cpumask |
| 923 | * |
| 924 | * Returns >= nr_cpu_ids if no cpus set. |
| 925 | */ |
| 926 | #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) |
| 927 | |
| 928 | /** |
Rusty Russell | cd83e42 | 2008-11-07 11:12:29 +1100 | [diff] [blame] | 929 | * cpumask_of - the cpumask containing just a given cpu |
| 930 | * @cpu: the cpu (<= nr_cpu_ids) |
| 931 | */ |
| 932 | #define cpumask_of(cpu) (get_cpu_mask(cpu)) |
| 933 | |
| 934 | /** |
Rusty Russell | 29c0177 | 2008-12-13 21:20:25 +1030 | [diff] [blame] | 935 | * cpumask_scnprintf - print a cpumask into a string as comma-separated hex |
| 936 | * @buf: the buffer to sprintf into |
| 937 | * @len: the length of the buffer |
| 938 | * @srcp: the cpumask to print |
| 939 | * |
| 940 | * If len is zero, returns zero. Otherwise returns the length of the |
| 941 | * (nul-terminated) @buf string. |
| 942 | */ |
| 943 | static inline int cpumask_scnprintf(char *buf, int len, |
| 944 | const struct cpumask *srcp) |
| 945 | { |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 946 | return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits); |
Rusty Russell | 29c0177 | 2008-12-13 21:20:25 +1030 | [diff] [blame] | 947 | } |
| 948 | |
| 949 | /** |
| 950 | * cpumask_parse_user - extract a cpumask from a user string |
| 951 | * @buf: the buffer to extract from |
| 952 | * @len: the length of the buffer |
| 953 | * @dstp: the cpumask to set. |
| 954 | * |
| 955 | * Returns -errno, or 0 for success. |
| 956 | */ |
| 957 | static inline int cpumask_parse_user(const char __user *buf, int len, |
| 958 | struct cpumask *dstp) |
| 959 | { |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 960 | return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); |
Rusty Russell | 29c0177 | 2008-12-13 21:20:25 +1030 | [diff] [blame] | 961 | } |
| 962 | |
| 963 | /** |
| 964 | * cpulist_scnprintf - print a cpumask into a string as comma-separated list |
| 965 | * @buf: the buffer to sprintf into |
| 966 | * @len: the length of the buffer |
| 967 | * @srcp: the cpumask to print |
| 968 | * |
| 969 | * If len is zero, returns zero. Otherwise returns the length of the |
| 970 | * (nul-terminated) @buf string. |
| 971 | */ |
| 972 | static inline int cpulist_scnprintf(char *buf, int len, |
| 973 | const struct cpumask *srcp) |
| 974 | { |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 975 | return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp), |
| 976 | nr_cpumask_bits); |
Rusty Russell | 29c0177 | 2008-12-13 21:20:25 +1030 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | /** |
| 980 | * cpulist_parse_user - extract a cpumask from a user string of ranges |
| 981 | * @buf: the buffer to extract from |
| 982 | * @len: the length of the buffer |
| 983 | * @dstp: the cpumask to set. |
| 984 | * |
| 985 | * Returns -errno, or 0 for success. |
| 986 | */ |
| 987 | static inline int cpulist_parse(const char *buf, struct cpumask *dstp) |
| 988 | { |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 989 | return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | /** |
| 993 | * cpumask_size - size to allocate for a 'struct cpumask' in bytes |
| 994 | * |
| 995 | * This will eventually be a runtime variable, depending on nr_cpu_ids. |
| 996 | */ |
| 997 | static inline size_t cpumask_size(void) |
| 998 | { |
| 999 | /* FIXME: Once all cpumask assignments are eliminated, this |
| 1000 | * can be nr_cpumask_bits */ |
| 1001 | return BITS_TO_LONGS(NR_CPUS) * sizeof(long); |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * cpumask_var_t: struct cpumask for stack usage. |
| 1006 | * |
| 1007 | * Oh, the wicked games we play! In order to make kernel coding a |
| 1008 | * little more difficult, we typedef cpumask_var_t to an array or a |
| 1009 | * pointer: doing &mask on an array is a noop, so it still works. |
| 1010 | * |
| 1011 | * ie. |
| 1012 | * cpumask_var_t tmpmask; |
| 1013 | * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) |
| 1014 | * return -ENOMEM; |
| 1015 | * |
| 1016 | * ... use 'tmpmask' like a normal struct cpumask * ... |
| 1017 | * |
| 1018 | * free_cpumask_var(tmpmask); |
| 1019 | */ |
| 1020 | #ifdef CONFIG_CPUMASK_OFFSTACK |
| 1021 | typedef struct cpumask *cpumask_var_t; |
| 1022 | |
Mike Travis | 7b4967c | 2008-12-19 16:56:37 +1030 | [diff] [blame] | 1023 | bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1024 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); |
Yinghai Lu | 0281b5d | 2009-06-06 14:50:36 -0700 | [diff] [blame^] | 1025 | bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); |
| 1026 | bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1027 | void alloc_bootmem_cpumask_var(cpumask_var_t *mask); |
| 1028 | void free_cpumask_var(cpumask_var_t mask); |
Rusty Russell | cd83e42 | 2008-11-07 11:12:29 +1100 | [diff] [blame] | 1029 | void free_bootmem_cpumask_var(cpumask_var_t mask); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1030 | |
| 1031 | #else |
| 1032 | typedef struct cpumask cpumask_var_t[1]; |
| 1033 | |
| 1034 | static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
| 1035 | { |
| 1036 | return true; |
| 1037 | } |
| 1038 | |
Mike Travis | 7b4967c | 2008-12-19 16:56:37 +1030 | [diff] [blame] | 1039 | static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, |
| 1040 | int node) |
| 1041 | { |
| 1042 | return true; |
| 1043 | } |
| 1044 | |
Yinghai Lu | 0281b5d | 2009-06-06 14:50:36 -0700 | [diff] [blame^] | 1045 | static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
| 1046 | { |
| 1047 | cpumask_clear(*mask); |
| 1048 | return true; |
| 1049 | } |
| 1050 | |
| 1051 | static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, |
| 1052 | int node) |
| 1053 | { |
| 1054 | cpumask_clear(*mask); |
| 1055 | return true; |
| 1056 | } |
| 1057 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1058 | static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
| 1059 | { |
| 1060 | } |
| 1061 | |
| 1062 | static inline void free_cpumask_var(cpumask_var_t mask) |
| 1063 | { |
| 1064 | } |
Rusty Russell | cd83e42 | 2008-11-07 11:12:29 +1100 | [diff] [blame] | 1065 | |
| 1066 | static inline void free_bootmem_cpumask_var(cpumask_var_t mask) |
| 1067 | { |
| 1068 | } |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1069 | #endif /* CONFIG_CPUMASK_OFFSTACK */ |
| 1070 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1071 | /* It's common to want to use cpu_all_mask in struct member initializers, |
| 1072 | * so it has to refer to an address rather than a pointer. */ |
| 1073 | extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); |
| 1074 | #define cpu_all_mask to_cpumask(cpu_all_bits) |
| 1075 | |
| 1076 | /* First bits of cpu_bit_bitmap are in fact unset. */ |
| 1077 | #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) |
| 1078 | |
Rusty Russell | ae7a47e | 2008-12-30 09:05:15 +1030 | [diff] [blame] | 1079 | #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) |
| 1080 | #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) |
| 1081 | #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) |
| 1082 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 1083 | /* Wrappers for arch boot code to manipulate normally-constant masks */ |
Rusty Russell | 3fa4152 | 2008-12-30 09:05:16 +1030 | [diff] [blame] | 1084 | void set_cpu_possible(unsigned int cpu, bool possible); |
| 1085 | void set_cpu_present(unsigned int cpu, bool present); |
| 1086 | void set_cpu_online(unsigned int cpu, bool online); |
| 1087 | void set_cpu_active(unsigned int cpu, bool active); |
| 1088 | void init_cpu_present(const struct cpumask *src); |
| 1089 | void init_cpu_possible(const struct cpumask *src); |
| 1090 | void init_cpu_online(const struct cpumask *src); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | #endif /* __LINUX_CPUMASK_H */ |