root/include/linux/cpumask.h

/* [<][>][^][v][top][bottom][index][help] */

INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. num_online_cpus
  2. cpu_max_bits_warn
  3. cpumask_check
  4. cpumask_first
  5. cpumask_last
  6. cpumask_next
  7. cpumask_next_zero
  8. cpumask_next_and
  9. cpumask_next_wrap
  10. cpumask_any_but
  11. cpumask_local_spread
  12. cpumask_first
  13. cpumask_last
  14. cpumask_next_zero
  15. cpumask_set_cpu
  16. __cpumask_set_cpu
  17. cpumask_clear_cpu
  18. __cpumask_clear_cpu
  19. cpumask_test_cpu
  20. cpumask_test_and_set_cpu
  21. cpumask_test_and_clear_cpu
  22. cpumask_setall
  23. cpumask_clear
  24. cpumask_and
  25. cpumask_or
  26. cpumask_xor
  27. cpumask_andnot
  28. cpumask_complement
  29. cpumask_equal
  30. cpumask_or_equal
  31. cpumask_intersects
  32. cpumask_subset
  33. cpumask_empty
  34. cpumask_full
  35. cpumask_weight
  36. cpumask_shift_right
  37. cpumask_shift_left
  38. cpumask_copy
  39. cpumask_parse_user
  40. cpumask_parselist_user
  41. cpumask_parse
  42. cpulist_parse
  43. cpumask_size
  44. cpumask_available
  45. alloc_cpumask_var
  46. alloc_cpumask_var_node
  47. zalloc_cpumask_var
  48. zalloc_cpumask_var_node
  49. alloc_bootmem_cpumask_var
  50. free_cpumask_var
  51. free_bootmem_cpumask_var
  52. cpumask_available
  53. reset_cpu_possible_mask
  54. set_cpu_possible
  55. set_cpu_present
  56. set_cpu_active
  57. __check_is_bitmap
  58. get_cpu_mask
  59. cpumap_print_to_pagebuf
   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_CPUMASK_H
   3 #define __LINUX_CPUMASK_H
   4 
   5 /*
   6  * Cpumasks provide a bitmap suitable for representing the
   7  * set of CPU's in a system, one bit position per CPU number.  In general,
   8  * only nr_cpu_ids (<= NR_CPUS) bits are valid.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/threads.h>
  12 #include <linux/bitmap.h>
  13 #include <linux/atomic.h>
  14 #include <linux/bug.h>
  15 
  16 /* Don't assign or return these: may not be this big! */
  17 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
  18 
  19 /**
  20  * cpumask_bits - get the bits in a cpumask
  21  * @maskp: the struct cpumask *
  22  *
  23  * You should only assume nr_cpu_ids bits of this mask are valid.  This is
  24  * a macro so it's const-correct.
  25  */
  26 #define cpumask_bits(maskp) ((maskp)->bits)
  27 
  28 /**
  29  * cpumask_pr_args - printf args to output a cpumask
  30  * @maskp: cpumask to be printed
  31  *
  32  * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
  33  */
  34 #define cpumask_pr_args(maskp)          nr_cpu_ids, cpumask_bits(maskp)
  35 
  36 #if NR_CPUS == 1
  37 #define nr_cpu_ids              1U
  38 #else
  39 extern unsigned int nr_cpu_ids;
  40 #endif
  41 
  42 #ifdef CONFIG_CPUMASK_OFFSTACK
  43 /* Assuming NR_CPUS is huge, a runtime limit is more efficient.  Also,
  44  * not all bits may be allocated. */
  45 #define nr_cpumask_bits nr_cpu_ids
  46 #else
  47 #define nr_cpumask_bits ((unsigned int)NR_CPUS)
  48 #endif
  49 
  50 /*
  51  * The following particular system cpumasks and operations manage
  52  * possible, present, active and online cpus.
  53  *
  54  *     cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
  55  *     cpu_present_mask - has bit 'cpu' set iff cpu is populated
  56  *     cpu_online_mask  - has bit 'cpu' set iff cpu available to scheduler
  57  *     cpu_active_mask  - has bit 'cpu' set iff cpu available to migration
  58  *
  59  *  If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
  60  *
  61  *  The cpu_possible_mask is fixed at boot time, as the set of CPU id's
  62  *  that it is possible might ever be plugged in at anytime during the
  63  *  life of that system boot.  The cpu_present_mask is dynamic(*),
  64  *  representing which CPUs are currently plugged in.  And
  65  *  cpu_online_mask is the dynamic subset of cpu_present_mask,
  66  *  indicating those CPUs available for scheduling.
  67  *
  68  *  If HOTPLUG is enabled, then cpu_possible_mask is forced to have
  69  *  all NR_CPUS bits set, otherwise it is just the set of CPUs that
  70  *  ACPI reports present at boot.
  71  *
  72  *  If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
  73  *  depending on what ACPI reports as currently plugged in, otherwise
  74  *  cpu_present_mask is just a copy of cpu_possible_mask.
  75  *
  76  *  (*) Well, cpu_present_mask is dynamic in the hotplug case.  If not
  77  *      hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
  78  *
  79  * Subtleties:
  80  * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
  81  *    assumption that their single CPU is online.  The UP
  82  *    cpu_{online,possible,present}_masks are placebos.  Changing them
  83  *    will have no useful affect on the following num_*_cpus()
  84  *    and cpu_*() macros in the UP case.  This ugliness is a UP
  85  *    optimization - don't waste any instructions or memory references
  86  *    asking if you're online or how many CPUs there are if there is
  87  *    only one CPU.
  88  */
  89 
  90 extern struct cpumask __cpu_possible_mask;
  91 extern struct cpumask __cpu_online_mask;
  92 extern struct cpumask __cpu_present_mask;
  93 extern struct cpumask __cpu_active_mask;
  94 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
  95 #define cpu_online_mask   ((const struct cpumask *)&__cpu_online_mask)
  96 #define cpu_present_mask  ((const struct cpumask *)&__cpu_present_mask)
  97 #define cpu_active_mask   ((const struct cpumask *)&__cpu_active_mask)
  98 
  99 extern atomic_t __num_online_cpus;
 100 
 101 #if NR_CPUS > 1
 102 /**
 103  * num_online_cpus() - Read the number of online CPUs
 104  *
 105  * Despite the fact that __num_online_cpus is of type atomic_t, this
 106  * interface gives only a momentary snapshot and is not protected against
 107  * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
 108  * region.
 109  */
 110 static inline unsigned int num_online_cpus(void)
 111 {
 112         return atomic_read(&__num_online_cpus);
 113 }
 114 #define num_possible_cpus()     cpumask_weight(cpu_possible_mask)
 115 #define num_present_cpus()      cpumask_weight(cpu_present_mask)
 116 #define num_active_cpus()       cpumask_weight(cpu_active_mask)
 117 #define cpu_online(cpu)         cpumask_test_cpu((cpu), cpu_online_mask)
 118 #define cpu_possible(cpu)       cpumask_test_cpu((cpu), cpu_possible_mask)
 119 #define cpu_present(cpu)        cpumask_test_cpu((cpu), cpu_present_mask)
 120 #define cpu_active(cpu)         cpumask_test_cpu((cpu), cpu_active_mask)
 121 #else
 122 #define num_online_cpus()       1U
 123 #define num_possible_cpus()     1U
 124 #define num_present_cpus()      1U
 125 #define num_active_cpus()       1U
 126 #define cpu_online(cpu)         ((cpu) == 0)
 127 #define cpu_possible(cpu)       ((cpu) == 0)
 128 #define cpu_present(cpu)        ((cpu) == 0)
 129 #define cpu_active(cpu)         ((cpu) == 0)
 130 #endif
 131 
 132 extern cpumask_t cpus_booted_once_mask;
 133 
 134 static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
 135 {
 136 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 137         WARN_ON_ONCE(cpu >= bits);
 138 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
 139 }
 140 
 141 /* verify cpu argument to cpumask_* operators */
 142 static inline unsigned int cpumask_check(unsigned int cpu)
 143 {
 144         cpu_max_bits_warn(cpu, nr_cpumask_bits);
 145         return cpu;
 146 }
 147 
 148 #if NR_CPUS == 1
 149 /* Uniprocessor.  Assume all masks are "1". */
 150 static inline unsigned int cpumask_first(const struct cpumask *srcp)
 151 {
 152         return 0;
 153 }
 154 
 155 static inline unsigned int cpumask_last(const struct cpumask *srcp)
 156 {
 157         return 0;
 158 }
 159 
 160 /* Valid inputs for n are -1 and 0. */
 161 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
 162 {
 163         return n+1;
 164 }
 165 
 166 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 167 {
 168         return n+1;
 169 }
 170 
 171 static inline unsigned int cpumask_next_and(int n,
 172                                             const struct cpumask *srcp,
 173                                             const struct cpumask *andp)
 174 {
 175         return n+1;
 176 }
 177 
 178 static inline unsigned int cpumask_next_wrap(int n, const struct cpumask *mask,
 179                                              int start, bool wrap)
 180 {
 181         /* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
 182         return (wrap && n == 0);
 183 }
 184 
 185 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
 186 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
 187                                            unsigned int cpu)
 188 {
 189         return 1;
 190 }
 191 
 192 static inline unsigned int cpumask_local_spread(unsigned int i, int node)
 193 {
 194         return 0;
 195 }
 196 
 197 #define for_each_cpu(cpu, mask)                 \
 198         for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
 199 #define for_each_cpu_not(cpu, mask)             \
 200         for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
 201 #define for_each_cpu_wrap(cpu, mask, start)     \
 202         for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
 203 #define for_each_cpu_and(cpu, mask1, mask2)     \
 204         for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
 205 #else
 206 /**
 207  * cpumask_first - get the first cpu in a cpumask
 208  * @srcp: the cpumask pointer
 209  *
 210  * Returns >= nr_cpu_ids if no cpus set.
 211  */
 212 static inline unsigned int cpumask_first(const struct cpumask *srcp)
 213 {
 214         return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
 215 }
 216 
 217 /**
 218  * cpumask_last - get the last CPU in a cpumask
 219  * @srcp:       - the cpumask pointer
 220  *
 221  * Returns      >= nr_cpumask_bits if no CPUs set.
 222  */
 223 static inline unsigned int cpumask_last(const struct cpumask *srcp)
 224 {
 225         return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
 226 }
 227 
 228 unsigned int cpumask_next(int n, const struct cpumask *srcp);
 229 
 230 /**
 231  * cpumask_next_zero - get the next unset cpu in a cpumask
 232  * @n: the cpu prior to the place to search (ie. return will be > @n)
 233  * @srcp: the cpumask pointer
 234  *
 235  * Returns >= nr_cpu_ids if no further cpus unset.
 236  */
 237 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 238 {
 239         /* -1 is a legal arg here. */
 240         if (n != -1)
 241                 cpumask_check(n);
 242         return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
 243 }
 244 
 245 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
 246 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
 247 unsigned int cpumask_local_spread(unsigned int i, int node);
 248 
 249 /**
 250  * for_each_cpu - iterate over every cpu in a mask
 251  * @cpu: the (optionally unsigned) integer iterator
 252  * @mask: the cpumask pointer
 253  *
 254  * After the loop, cpu is >= nr_cpu_ids.
 255  */
 256 #define for_each_cpu(cpu, mask)                         \
 257         for ((cpu) = -1;                                \
 258                 (cpu) = cpumask_next((cpu), (mask)),    \
 259                 (cpu) < nr_cpu_ids;)
 260 
 261 /**
 262  * for_each_cpu_not - iterate over every cpu in a complemented mask
 263  * @cpu: the (optionally unsigned) integer iterator
 264  * @mask: the cpumask pointer
 265  *
 266  * After the loop, cpu is >= nr_cpu_ids.
 267  */
 268 #define for_each_cpu_not(cpu, mask)                             \
 269         for ((cpu) = -1;                                        \
 270                 (cpu) = cpumask_next_zero((cpu), (mask)),       \
 271                 (cpu) < nr_cpu_ids;)
 272 
 273 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
 274 
 275 /**
 276  * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
 277  * @cpu: the (optionally unsigned) integer iterator
 278  * @mask: the cpumask poiter
 279  * @start: the start location
 280  *
 281  * The implementation does not assume any bit in @mask is set (including @start).
 282  *
 283  * After the loop, cpu is >= nr_cpu_ids.
 284  */
 285 #define for_each_cpu_wrap(cpu, mask, start)                                     \
 286         for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false);      \
 287              (cpu) < nr_cpumask_bits;                                           \
 288              (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
 289 
 290 /**
 291  * for_each_cpu_and - iterate over every cpu in both masks
 292  * @cpu: the (optionally unsigned) integer iterator
 293  * @mask1: the first cpumask pointer
 294  * @mask2: the second cpumask pointer
 295  *
 296  * This saves a temporary CPU mask in many places.  It is equivalent to:
 297  *      struct cpumask tmp;
 298  *      cpumask_and(&tmp, &mask1, &mask2);
 299  *      for_each_cpu(cpu, &tmp)
 300  *              ...
 301  *
 302  * After the loop, cpu is >= nr_cpu_ids.
 303  */
 304 #define for_each_cpu_and(cpu, mask1, mask2)                             \
 305         for ((cpu) = -1;                                                \
 306                 (cpu) = cpumask_next_and((cpu), (mask1), (mask2)),      \
 307                 (cpu) < nr_cpu_ids;)
 308 #endif /* SMP */
 309 
 310 #define CPU_BITS_NONE                                           \
 311 {                                                               \
 312         [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL                  \
 313 }
 314 
 315 #define CPU_BITS_CPU0                                           \
 316 {                                                               \
 317         [0] =  1UL                                              \
 318 }
 319 
 320 /**
 321  * cpumask_set_cpu - set a cpu in a cpumask
 322  * @cpu: cpu number (< nr_cpu_ids)
 323  * @dstp: the cpumask pointer
 324  */
 325 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
 326 {
 327         set_bit(cpumask_check(cpu), cpumask_bits(dstp));
 328 }
 329 
 330 static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
 331 {
 332         __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
 333 }
 334 
 335 
 336 /**
 337  * cpumask_clear_cpu - clear a cpu in a cpumask
 338  * @cpu: cpu number (< nr_cpu_ids)
 339  * @dstp: the cpumask pointer
 340  */
 341 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
 342 {
 343         clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
 344 }
 345 
 346 static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
 347 {
 348         __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
 349 }
 350 
 351 /**
 352  * cpumask_test_cpu - test for a cpu in a cpumask
 353  * @cpu: cpu number (< nr_cpu_ids)
 354  * @cpumask: the cpumask pointer
 355  *
 356  * Returns 1 if @cpu is set in @cpumask, else returns 0
 357  */
 358 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
 359 {
 360         return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
 361 }
 362 
 363 /**
 364  * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
 365  * @cpu: cpu number (< nr_cpu_ids)
 366  * @cpumask: the cpumask pointer
 367  *
 368  * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
 369  *
 370  * test_and_set_bit wrapper for cpumasks.
 371  */
 372 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
 373 {
 374         return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
 375 }
 376 
 377 /**
 378  * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
 379  * @cpu: cpu number (< nr_cpu_ids)
 380  * @cpumask: the cpumask pointer
 381  *
 382  * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
 383  *
 384  * test_and_clear_bit wrapper for cpumasks.
 385  */
 386 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
 387 {
 388         return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
 389 }
 390 
 391 /**
 392  * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
 393  * @dstp: the cpumask pointer
 394  */
 395 static inline void cpumask_setall(struct cpumask *dstp)
 396 {
 397         bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
 398 }
 399 
 400 /**
 401  * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
 402  * @dstp: the cpumask pointer
 403  */
 404 static inline void cpumask_clear(struct cpumask *dstp)
 405 {
 406         bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
 407 }
 408 
 409 /**
 410  * cpumask_and - *dstp = *src1p & *src2p
 411  * @dstp: the cpumask result
 412  * @src1p: the first input
 413  * @src2p: the second input
 414  *
 415  * If *@dstp is empty, returns 0, else returns 1
 416  */
 417 static inline int cpumask_and(struct cpumask *dstp,
 418                                const struct cpumask *src1p,
 419                                const struct cpumask *src2p)
 420 {
 421         return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
 422                                        cpumask_bits(src2p), nr_cpumask_bits);
 423 }
 424 
 425 /**
 426  * cpumask_or - *dstp = *src1p | *src2p
 427  * @dstp: the cpumask result
 428  * @src1p: the first input
 429  * @src2p: the second input
 430  */
 431 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
 432                               const struct cpumask *src2p)
 433 {
 434         bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
 435                                       cpumask_bits(src2p), nr_cpumask_bits);
 436 }
 437 
 438 /**
 439  * cpumask_xor - *dstp = *src1p ^ *src2p
 440  * @dstp: the cpumask result
 441  * @src1p: the first input
 442  * @src2p: the second input
 443  */
 444 static inline void cpumask_xor(struct cpumask *dstp,
 445                                const struct cpumask *src1p,
 446                                const struct cpumask *src2p)
 447 {
 448         bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
 449                                        cpumask_bits(src2p), nr_cpumask_bits);
 450 }
 451 
 452 /**
 453  * cpumask_andnot - *dstp = *src1p & ~*src2p
 454  * @dstp: the cpumask result
 455  * @src1p: the first input
 456  * @src2p: the second input
 457  *
 458  * If *@dstp is empty, returns 0, else returns 1
 459  */
 460 static inline int cpumask_andnot(struct cpumask *dstp,
 461                                   const struct cpumask *src1p,
 462                                   const struct cpumask *src2p)
 463 {
 464         return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
 465                                           cpumask_bits(src2p), nr_cpumask_bits);
 466 }
 467 
 468 /**
 469  * cpumask_complement - *dstp = ~*srcp
 470  * @dstp: the cpumask result
 471  * @srcp: the input to invert
 472  */
 473 static inline void cpumask_complement(struct cpumask *dstp,
 474                                       const struct cpumask *srcp)
 475 {
 476         bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
 477                                               nr_cpumask_bits);
 478 }
 479 
 480 /**
 481  * cpumask_equal - *src1p == *src2p
 482  * @src1p: the first input
 483  * @src2p: the second input
 484  */
 485 static inline bool cpumask_equal(const struct cpumask *src1p,
 486                                 const struct cpumask *src2p)
 487 {
 488         return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
 489                                                  nr_cpumask_bits);
 490 }
 491 
 492 /**
 493  * cpumask_or_equal - *src1p | *src2p == *src3p
 494  * @src1p: the first input
 495  * @src2p: the second input
 496  * @src3p: the third input
 497  */
 498 static inline bool cpumask_or_equal(const struct cpumask *src1p,
 499                                     const struct cpumask *src2p,
 500                                     const struct cpumask *src3p)
 501 {
 502         return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p),
 503                                cpumask_bits(src3p), nr_cpumask_bits);
 504 }
 505 
 506 /**
 507  * cpumask_intersects - (*src1p & *src2p) != 0
 508  * @src1p: the first input
 509  * @src2p: the second input
 510  */
 511 static inline bool cpumask_intersects(const struct cpumask *src1p,
 512                                      const struct cpumask *src2p)
 513 {
 514         return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
 515                                                       nr_cpumask_bits);
 516 }
 517 
 518 /**
 519  * cpumask_subset - (*src1p & ~*src2p) == 0
 520  * @src1p: the first input
 521  * @src2p: the second input
 522  *
 523  * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
 524  */
 525 static inline int cpumask_subset(const struct cpumask *src1p,
 526                                  const struct cpumask *src2p)
 527 {
 528         return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
 529                                                   nr_cpumask_bits);
 530 }
 531 
 532 /**
 533  * cpumask_empty - *srcp == 0
 534  * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
 535  */
 536 static inline bool cpumask_empty(const struct cpumask *srcp)
 537 {
 538         return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
 539 }
 540 
 541 /**
 542  * cpumask_full - *srcp == 0xFFFFFFFF...
 543  * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
 544  */
 545 static inline bool cpumask_full(const struct cpumask *srcp)
 546 {
 547         return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
 548 }
 549 
 550 /**
 551  * cpumask_weight - Count of bits in *srcp
 552  * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
 553  */
 554 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
 555 {
 556         return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
 557 }
 558 
 559 /**
 560  * cpumask_shift_right - *dstp = *srcp >> n
 561  * @dstp: the cpumask result
 562  * @srcp: the input to shift
 563  * @n: the number of bits to shift by
 564  */
 565 static inline void cpumask_shift_right(struct cpumask *dstp,
 566                                        const struct cpumask *srcp, int n)
 567 {
 568         bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
 569                                                nr_cpumask_bits);
 570 }
 571 
 572 /**
 573  * cpumask_shift_left - *dstp = *srcp << n
 574  * @dstp: the cpumask result
 575  * @srcp: the input to shift
 576  * @n: the number of bits to shift by
 577  */
 578 static inline void cpumask_shift_left(struct cpumask *dstp,
 579                                       const struct cpumask *srcp, int n)
 580 {
 581         bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
 582                                               nr_cpumask_bits);
 583 }
 584 
 585 /**
 586  * cpumask_copy - *dstp = *srcp
 587  * @dstp: the result
 588  * @srcp: the input cpumask
 589  */
 590 static inline void cpumask_copy(struct cpumask *dstp,
 591                                 const struct cpumask *srcp)
 592 {
 593         bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
 594 }
 595 
 596 /**
 597  * cpumask_any - pick a "random" cpu from *srcp
 598  * @srcp: the input cpumask
 599  *
 600  * Returns >= nr_cpu_ids if no cpus set.
 601  */
 602 #define cpumask_any(srcp) cpumask_first(srcp)
 603 
 604 /**
 605  * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
 606  * @src1p: the first input
 607  * @src2p: the second input
 608  *
 609  * Returns >= nr_cpu_ids if no cpus set in both.  See also cpumask_next_and().
 610  */
 611 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
 612 
 613 /**
 614  * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
 615  * @mask1: the first input cpumask
 616  * @mask2: the second input cpumask
 617  *
 618  * Returns >= nr_cpu_ids if no cpus set.
 619  */
 620 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
 621 
 622 /**
 623  * cpumask_of - the cpumask containing just a given cpu
 624  * @cpu: the cpu (<= nr_cpu_ids)
 625  */
 626 #define cpumask_of(cpu) (get_cpu_mask(cpu))
 627 
 628 /**
 629  * cpumask_parse_user - extract a cpumask from a user string
 630  * @buf: the buffer to extract from
 631  * @len: the length of the buffer
 632  * @dstp: the cpumask to set.
 633  *
 634  * Returns -errno, or 0 for success.
 635  */
 636 static inline int cpumask_parse_user(const char __user *buf, int len,
 637                                      struct cpumask *dstp)
 638 {
 639         return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
 640 }
 641 
 642 /**
 643  * cpumask_parselist_user - extract a cpumask from a user string
 644  * @buf: the buffer to extract from
 645  * @len: the length of the buffer
 646  * @dstp: the cpumask to set.
 647  *
 648  * Returns -errno, or 0 for success.
 649  */
 650 static inline int cpumask_parselist_user(const char __user *buf, int len,
 651                                      struct cpumask *dstp)
 652 {
 653         return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
 654                                      nr_cpumask_bits);
 655 }
 656 
 657 /**
 658  * cpumask_parse - extract a cpumask from a string
 659  * @buf: the buffer to extract from
 660  * @dstp: the cpumask to set.
 661  *
 662  * Returns -errno, or 0 for success.
 663  */
 664 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
 665 {
 666         unsigned int len = strchrnul(buf, '\n') - buf;
 667 
 668         return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
 669 }
 670 
 671 /**
 672  * cpulist_parse - extract a cpumask from a user string of ranges
 673  * @buf: the buffer to extract from
 674  * @dstp: the cpumask to set.
 675  *
 676  * Returns -errno, or 0 for success.
 677  */
 678 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
 679 {
 680         return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
 681 }
 682 
 683 /**
 684  * cpumask_size - size to allocate for a 'struct cpumask' in bytes
 685  */
 686 static inline unsigned int cpumask_size(void)
 687 {
 688         return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
 689 }
 690 
 691 /*
 692  * cpumask_var_t: struct cpumask for stack usage.
 693  *
 694  * Oh, the wicked games we play!  In order to make kernel coding a
 695  * little more difficult, we typedef cpumask_var_t to an array or a
 696  * pointer: doing &mask on an array is a noop, so it still works.
 697  *
 698  * ie.
 699  *      cpumask_var_t tmpmask;
 700  *      if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
 701  *              return -ENOMEM;
 702  *
 703  *        ... use 'tmpmask' like a normal struct cpumask * ...
 704  *
 705  *      free_cpumask_var(tmpmask);
 706  *
 707  *
 708  * However, one notable exception is there. alloc_cpumask_var() allocates
 709  * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
 710  * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
 711  *
 712  *      cpumask_var_t tmpmask;
 713  *      if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
 714  *              return -ENOMEM;
 715  *
 716  *      var = *tmpmask;
 717  *
 718  * This code makes NR_CPUS length memcopy and brings to a memory corruption.
 719  * cpumask_copy() provide safe copy functionality.
 720  *
 721  * Note that there is another evil here: If you define a cpumask_var_t
 722  * as a percpu variable then the way to obtain the address of the cpumask
 723  * structure differently influences what this_cpu_* operation needs to be
 724  * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
 725  * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
 726  * other type of cpumask_var_t implementation is configured.
 727  *
 728  * Please also note that __cpumask_var_read_mostly can be used to declare
 729  * a cpumask_var_t variable itself (not its content) as read mostly.
 730  */
 731 #ifdef CONFIG_CPUMASK_OFFSTACK
 732 typedef struct cpumask *cpumask_var_t;
 733 
 734 #define this_cpu_cpumask_var_ptr(x)     this_cpu_read(x)
 735 #define __cpumask_var_read_mostly       __read_mostly
 736 
 737 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
 738 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
 739 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
 740 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
 741 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
 742 void free_cpumask_var(cpumask_var_t mask);
 743 void free_bootmem_cpumask_var(cpumask_var_t mask);
 744 
 745 static inline bool cpumask_available(cpumask_var_t mask)
 746 {
 747         return mask != NULL;
 748 }
 749 
 750 #else
 751 typedef struct cpumask cpumask_var_t[1];
 752 
 753 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
 754 #define __cpumask_var_read_mostly
 755 
 756 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 757 {
 758         return true;
 759 }
 760 
 761 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
 762                                           int node)
 763 {
 764         return true;
 765 }
 766 
 767 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 768 {
 769         cpumask_clear(*mask);
 770         return true;
 771 }
 772 
 773 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
 774                                           int node)
 775 {
 776         cpumask_clear(*mask);
 777         return true;
 778 }
 779 
 780 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
 781 {
 782 }
 783 
 784 static inline void free_cpumask_var(cpumask_var_t mask)
 785 {
 786 }
 787 
 788 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
 789 {
 790 }
 791 
 792 static inline bool cpumask_available(cpumask_var_t mask)
 793 {
 794         return true;
 795 }
 796 #endif /* CONFIG_CPUMASK_OFFSTACK */
 797 
 798 /* It's common to want to use cpu_all_mask in struct member initializers,
 799  * so it has to refer to an address rather than a pointer. */
 800 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
 801 #define cpu_all_mask to_cpumask(cpu_all_bits)
 802 
 803 /* First bits of cpu_bit_bitmap are in fact unset. */
 804 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
 805 
 806 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
 807 #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
 808 #define for_each_present_cpu(cpu)  for_each_cpu((cpu), cpu_present_mask)
 809 
 810 /* Wrappers for arch boot code to manipulate normally-constant masks */
 811 void init_cpu_present(const struct cpumask *src);
 812 void init_cpu_possible(const struct cpumask *src);
 813 void init_cpu_online(const struct cpumask *src);
 814 
 815 static inline void reset_cpu_possible_mask(void)
 816 {
 817         bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
 818 }
 819 
 820 static inline void
 821 set_cpu_possible(unsigned int cpu, bool possible)
 822 {
 823         if (possible)
 824                 cpumask_set_cpu(cpu, &__cpu_possible_mask);
 825         else
 826                 cpumask_clear_cpu(cpu, &__cpu_possible_mask);
 827 }
 828 
 829 static inline void
 830 set_cpu_present(unsigned int cpu, bool present)
 831 {
 832         if (present)
 833                 cpumask_set_cpu(cpu, &__cpu_present_mask);
 834         else
 835                 cpumask_clear_cpu(cpu, &__cpu_present_mask);
 836 }
 837 
 838 void set_cpu_online(unsigned int cpu, bool online);
 839 
 840 static inline void
 841 set_cpu_active(unsigned int cpu, bool active)
 842 {
 843         if (active)
 844                 cpumask_set_cpu(cpu, &__cpu_active_mask);
 845         else
 846                 cpumask_clear_cpu(cpu, &__cpu_active_mask);
 847 }
 848 
 849 
 850 /**
 851  * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
 852  * @bitmap: the bitmap
 853  *
 854  * There are a few places where cpumask_var_t isn't appropriate and
 855  * static cpumasks must be used (eg. very early boot), yet we don't
 856  * expose the definition of 'struct cpumask'.
 857  *
 858  * This does the conversion, and can be used as a constant initializer.
 859  */
 860 #define to_cpumask(bitmap)                                              \
 861         ((struct cpumask *)(1 ? (bitmap)                                \
 862                             : (void *)sizeof(__check_is_bitmap(bitmap))))
 863 
 864 static inline int __check_is_bitmap(const unsigned long *bitmap)
 865 {
 866         return 1;
 867 }
 868 
 869 /*
 870  * Special-case data structure for "single bit set only" constant CPU masks.
 871  *
 872  * We pre-generate all the 64 (or 32) possible bit positions, with enough
 873  * padding to the left and the right, and return the constant pointer
 874  * appropriately offset.
 875  */
 876 extern const unsigned long
 877         cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
 878 
 879 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
 880 {
 881         const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
 882         p -= cpu / BITS_PER_LONG;
 883         return to_cpumask(p);
 884 }
 885 
 886 #define cpu_is_offline(cpu)     unlikely(!cpu_online(cpu))
 887 
 888 #if NR_CPUS <= BITS_PER_LONG
 889 #define CPU_BITS_ALL                                            \
 890 {                                                               \
 891         [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS)     \
 892 }
 893 
 894 #else /* NR_CPUS > BITS_PER_LONG */
 895 
 896 #define CPU_BITS_ALL                                            \
 897 {                                                               \
 898         [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,                \
 899         [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS)     \
 900 }
 901 #endif /* NR_CPUS > BITS_PER_LONG */
 902 
 903 /**
 904  * cpumap_print_to_pagebuf  - copies the cpumask into the buffer either
 905  *      as comma-separated list of cpus or hex values of cpumask
 906  * @list: indicates whether the cpumap must be list
 907  * @mask: the cpumask to copy
 908  * @buf: the buffer to copy into
 909  *
 910  * Returns the length of the (null-terminated) @buf string, zero if
 911  * nothing is copied.
 912  */
 913 static inline ssize_t
 914 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
 915 {
 916         return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
 917                                       nr_cpu_ids);
 918 }
 919 
 920 #if NR_CPUS <= BITS_PER_LONG
 921 #define CPU_MASK_ALL                                                    \
 922 (cpumask_t) { {                                                         \
 923         [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS)     \
 924 } }
 925 #else
 926 #define CPU_MASK_ALL                                                    \
 927 (cpumask_t) { {                                                         \
 928         [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,                        \
 929         [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS)     \
 930 } }
 931 #endif /* NR_CPUS > BITS_PER_LONG */
 932 
 933 #define CPU_MASK_NONE                                                   \
 934 (cpumask_t) { {                                                         \
 935         [0 ... BITS_TO_LONGS(NR_CPUS)-1] =  0UL                         \
 936 } }
 937 
 938 #define CPU_MASK_CPU0                                                   \
 939 (cpumask_t) { {                                                         \
 940         [0] =  1UL                                                      \
 941 } }
 942 
 943 #endif /* __LINUX_CPUMASK_H */
/* [<][>][^][v][top][bottom][index][help] */