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. In general, 7 * only nr_cpu_ids (<= NR_CPUS) bits are valid. 8 */ 9 #include <linux/kernel.h> 10 #include <linux/threads.h> 11 #include <linux/bitmap.h> 12 13 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; 14 15 /** 16 * cpumask_bits - get the bits in a cpumask 17 * @maskp: the struct cpumask * 18 * 19 * You should only assume nr_cpu_ids bits of this mask are valid. This is 20 * a macro so it's const-correct. 21 */ 22 #define cpumask_bits(maskp) ((maskp)->bits) 23 24 #if NR_CPUS == 1 25 #define nr_cpu_ids 1 26 #else 27 extern int nr_cpu_ids; 28 #endif 29 30 #ifdef CONFIG_CPUMASK_OFFSTACK 31 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also, 32 * not all bits may be allocated. */ 33 #define nr_cpumask_bits nr_cpu_ids 34 #else 35 #define nr_cpumask_bits NR_CPUS 36 #endif 37 38 /* 39 * The following particular system cpumasks and operations manage 40 * possible, present, active and online cpus. 41 * 42 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable 43 * cpu_present_mask - has bit 'cpu' set iff cpu is populated 44 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler 45 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration 46 * 47 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. 48 * 49 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's 50 * that it is possible might ever be plugged in at anytime during the 51 * life of that system boot. The cpu_present_mask is dynamic(*), 52 * representing which CPUs are currently plugged in. And 53 * cpu_online_mask is the dynamic subset of cpu_present_mask, 54 * indicating those CPUs available for scheduling. 55 * 56 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have 57 * all NR_CPUS bits set, otherwise it is just the set of CPUs that 58 * ACPI reports present at boot. 59 * 60 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, 61 * depending on what ACPI reports as currently plugged in, otherwise 62 * cpu_present_mask is just a copy of cpu_possible_mask. 63 * 64 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not 65 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. 66 * 67 * Subtleties: 68 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode 69 * assumption that their single CPU is online. The UP 70 * cpu_{online,possible,present}_masks are placebos. Changing them 71 * will have no useful affect on the following num_*_cpus() 72 * and cpu_*() macros in the UP case. This ugliness is a UP 73 * optimization - don't waste any instructions or memory references 74 * asking if you're online or how many CPUs there are if there is 75 * only one CPU. 76 */ 77 78 extern const struct cpumask *const cpu_possible_mask; 79 extern const struct cpumask *const cpu_online_mask; 80 extern const struct cpumask *const cpu_present_mask; 81 extern const struct cpumask *const cpu_active_mask; 82 83 #if NR_CPUS > 1 84 #define num_online_cpus() cpumask_weight(cpu_online_mask) 85 #define num_possible_cpus() cpumask_weight(cpu_possible_mask) 86 #define num_present_cpus() cpumask_weight(cpu_present_mask) 87 #define num_active_cpus() cpumask_weight(cpu_active_mask) 88 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) 89 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) 90 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) 91 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) 92 #else 93 #define num_online_cpus() 1 94 #define num_possible_cpus() 1 95 #define num_present_cpus() 1 96 #define num_active_cpus() 1 97 #define cpu_online(cpu) ((cpu) == 0) 98 #define cpu_possible(cpu) ((cpu) == 0) 99 #define cpu_present(cpu) ((cpu) == 0) 100 #define cpu_active(cpu) ((cpu) == 0) 101 #endif 102 103 /* verify cpu argument to cpumask_* operators */ 104 static inline unsigned int cpumask_check(unsigned int cpu) 105 { 106 #ifdef CONFIG_DEBUG_PER_CPU_MAPS 107 WARN_ON_ONCE(cpu >= nr_cpumask_bits); 108 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ 109 return cpu; 110 } 111 112 #if NR_CPUS == 1 113 /* Uniprocessor. Assume all masks are "1". */ 114 static inline unsigned int cpumask_first(const struct cpumask *srcp) 115 { 116 return 0; 117 } 118 119 /* Valid inputs for n are -1 and 0. */ 120 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 121 { 122 return n+1; 123 } 124 125 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 126 { 127 return n+1; 128 } 129 130 static inline unsigned int cpumask_next_and(int n, 131 const struct cpumask *srcp, 132 const struct cpumask *andp) 133 { 134 return n+1; 135 } 136 137 /* cpu must be a valid cpu, ie 0, so there's no other choice. */ 138 static inline unsigned int cpumask_any_but(const struct cpumask *mask, 139 unsigned int cpu) 140 { 141 return 1; 142 } 143 144 #define for_each_cpu(cpu, mask) \ 145 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 146 #define for_each_cpu_and(cpu, mask, and) \ 147 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) 148 #else 149 /** 150 * cpumask_first - get the first cpu in a cpumask 151 * @srcp: the cpumask pointer 152 * 153 * Returns >= nr_cpu_ids if no cpus set. 154 */ 155 static inline unsigned int cpumask_first(const struct cpumask *srcp) 156 { 157 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); 158 } 159 160 /** 161 * cpumask_next - get the next cpu in a cpumask 162 * @n: the cpu prior to the place to search (ie. return will be > @n) 163 * @srcp: the cpumask pointer 164 * 165 * Returns >= nr_cpu_ids if no further cpus set. 166 */ 167 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 168 { 169 /* -1 is a legal arg here. */ 170 if (n != -1) 171 cpumask_check(n); 172 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 173 } 174 175 /** 176 * cpumask_next_zero - get the next unset cpu in a cpumask 177 * @n: the cpu prior to the place to search (ie. return will be > @n) 178 * @srcp: the cpumask pointer 179 * 180 * Returns >= nr_cpu_ids if no further cpus unset. 181 */ 182 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 183 { 184 /* -1 is a legal arg here. */ 185 if (n != -1) 186 cpumask_check(n); 187 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 188 } 189 190 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); 191 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); 192 193 /** 194 * for_each_cpu - iterate over every cpu in a mask 195 * @cpu: the (optionally unsigned) integer iterator 196 * @mask: the cpumask pointer 197 * 198 * After the loop, cpu is >= nr_cpu_ids. 199 */ 200 #define for_each_cpu(cpu, mask) \ 201 for ((cpu) = -1; \ 202 (cpu) = cpumask_next((cpu), (mask)), \ 203 (cpu) < nr_cpu_ids;) 204 205 /** 206 * for_each_cpu_and - iterate over every cpu in both masks 207 * @cpu: the (optionally unsigned) integer iterator 208 * @mask: the first cpumask pointer 209 * @and: the second cpumask pointer 210 * 211 * This saves a temporary CPU mask in many places. It is equivalent to: 212 * struct cpumask tmp; 213 * cpumask_and(&tmp, &mask, &and); 214 * for_each_cpu(cpu, &tmp) 215 * ... 216 * 217 * After the loop, cpu is >= nr_cpu_ids. 218 */ 219 #define for_each_cpu_and(cpu, mask, and) \ 220 for ((cpu) = -1; \ 221 (cpu) = cpumask_next_and((cpu), (mask), (and)), \ 222 (cpu) < nr_cpu_ids;) 223 #endif /* SMP */ 224 225 #define CPU_BITS_NONE \ 226 { \ 227 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 228 } 229 230 #define CPU_BITS_CPU0 \ 231 { \ 232 [0] = 1UL \ 233 } 234 235 /** 236 * cpumask_set_cpu - set a cpu in a cpumask 237 * @cpu: cpu number (< nr_cpu_ids) 238 * @dstp: the cpumask pointer 239 */ 240 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 241 { 242 set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 243 } 244 245 /** 246 * cpumask_clear_cpu - clear a cpu in a cpumask 247 * @cpu: cpu number (< nr_cpu_ids) 248 * @dstp: the cpumask pointer 249 */ 250 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) 251 { 252 clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 253 } 254 255 /** 256 * cpumask_test_cpu - test for a cpu in a cpumask 257 * @cpu: cpu number (< nr_cpu_ids) 258 * @cpumask: the cpumask pointer 259 * 260 * No static inline type checking - see Subtlety (1) above. 261 */ 262 #define cpumask_test_cpu(cpu, cpumask) \ 263 test_bit(cpumask_check(cpu), cpumask_bits((cpumask))) 264 265 /** 266 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 267 * @cpu: cpu number (< nr_cpu_ids) 268 * @cpumask: the cpumask pointer 269 * 270 * test_and_set_bit wrapper for cpumasks. 271 */ 272 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 273 { 274 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 275 } 276 277 /** 278 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 279 * @cpu: cpu number (< nr_cpu_ids) 280 * @cpumask: the cpumask pointer 281 * 282 * test_and_clear_bit wrapper for cpumasks. 283 */ 284 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 285 { 286 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 287 } 288 289 /** 290 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 291 * @dstp: the cpumask pointer 292 */ 293 static inline void cpumask_setall(struct cpumask *dstp) 294 { 295 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 296 } 297 298 /** 299 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 300 * @dstp: the cpumask pointer 301 */ 302 static inline void cpumask_clear(struct cpumask *dstp) 303 { 304 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); 305 } 306 307 /** 308 * cpumask_and - *dstp = *src1p & *src2p 309 * @dstp: the cpumask result 310 * @src1p: the first input 311 * @src2p: the second input 312 */ 313 static inline int cpumask_and(struct cpumask *dstp, 314 const struct cpumask *src1p, 315 const struct cpumask *src2p) 316 { 317 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 318 cpumask_bits(src2p), nr_cpumask_bits); 319 } 320 321 /** 322 * cpumask_or - *dstp = *src1p | *src2p 323 * @dstp: the cpumask result 324 * @src1p: the first input 325 * @src2p: the second input 326 */ 327 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 328 const struct cpumask *src2p) 329 { 330 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 331 cpumask_bits(src2p), nr_cpumask_bits); 332 } 333 334 /** 335 * cpumask_xor - *dstp = *src1p ^ *src2p 336 * @dstp: the cpumask result 337 * @src1p: the first input 338 * @src2p: the second input 339 */ 340 static inline void cpumask_xor(struct cpumask *dstp, 341 const struct cpumask *src1p, 342 const struct cpumask *src2p) 343 { 344 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 345 cpumask_bits(src2p), nr_cpumask_bits); 346 } 347 348 /** 349 * cpumask_andnot - *dstp = *src1p & ~*src2p 350 * @dstp: the cpumask result 351 * @src1p: the first input 352 * @src2p: the second input 353 */ 354 static inline int cpumask_andnot(struct cpumask *dstp, 355 const struct cpumask *src1p, 356 const struct cpumask *src2p) 357 { 358 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 359 cpumask_bits(src2p), nr_cpumask_bits); 360 } 361 362 /** 363 * cpumask_complement - *dstp = ~*srcp 364 * @dstp: the cpumask result 365 * @srcp: the input to invert 366 */ 367 static inline void cpumask_complement(struct cpumask *dstp, 368 const struct cpumask *srcp) 369 { 370 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), 371 nr_cpumask_bits); 372 } 373 374 /** 375 * cpumask_equal - *src1p == *src2p 376 * @src1p: the first input 377 * @src2p: the second input 378 */ 379 static inline bool cpumask_equal(const struct cpumask *src1p, 380 const struct cpumask *src2p) 381 { 382 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 383 nr_cpumask_bits); 384 } 385 386 /** 387 * cpumask_intersects - (*src1p & *src2p) != 0 388 * @src1p: the first input 389 * @src2p: the second input 390 */ 391 static inline bool cpumask_intersects(const struct cpumask *src1p, 392 const struct cpumask *src2p) 393 { 394 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 395 nr_cpumask_bits); 396 } 397 398 /** 399 * cpumask_subset - (*src1p & ~*src2p) == 0 400 * @src1p: the first input 401 * @src2p: the second input 402 */ 403 static inline int cpumask_subset(const struct cpumask *src1p, 404 const struct cpumask *src2p) 405 { 406 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 407 nr_cpumask_bits); 408 } 409 410 /** 411 * cpumask_empty - *srcp == 0 412 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 413 */ 414 static inline bool cpumask_empty(const struct cpumask *srcp) 415 { 416 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); 417 } 418 419 /** 420 * cpumask_full - *srcp == 0xFFFFFFFF... 421 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 422 */ 423 static inline bool cpumask_full(const struct cpumask *srcp) 424 { 425 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 426 } 427 428 /** 429 * cpumask_weight - Count of bits in *srcp 430 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 431 */ 432 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 433 { 434 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); 435 } 436 437 /** 438 * cpumask_shift_right - *dstp = *srcp >> n 439 * @dstp: the cpumask result 440 * @srcp: the input to shift 441 * @n: the number of bits to shift by 442 */ 443 static inline void cpumask_shift_right(struct cpumask *dstp, 444 const struct cpumask *srcp, int n) 445 { 446 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 447 nr_cpumask_bits); 448 } 449 450 /** 451 * cpumask_shift_left - *dstp = *srcp << n 452 * @dstp: the cpumask result 453 * @srcp: the input to shift 454 * @n: the number of bits to shift by 455 */ 456 static inline void cpumask_shift_left(struct cpumask *dstp, 457 const struct cpumask *srcp, int n) 458 { 459 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 460 nr_cpumask_bits); 461 } 462 463 /** 464 * cpumask_copy - *dstp = *srcp 465 * @dstp: the result 466 * @srcp: the input cpumask 467 */ 468 static inline void cpumask_copy(struct cpumask *dstp, 469 const struct cpumask *srcp) 470 { 471 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); 472 } 473 474 /** 475 * cpumask_any - pick a "random" cpu from *srcp 476 * @srcp: the input cpumask 477 * 478 * Returns >= nr_cpu_ids if no cpus set. 479 */ 480 #define cpumask_any(srcp) cpumask_first(srcp) 481 482 /** 483 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 484 * @src1p: the first input 485 * @src2p: the second input 486 * 487 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 488 */ 489 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) 490 491 /** 492 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 493 * @mask1: the first input cpumask 494 * @mask2: the second input cpumask 495 * 496 * Returns >= nr_cpu_ids if no cpus set. 497 */ 498 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 499 500 /** 501 * cpumask_of - the cpumask containing just a given cpu 502 * @cpu: the cpu (<= nr_cpu_ids) 503 */ 504 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 505 506 /** 507 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex 508 * @buf: the buffer to sprintf into 509 * @len: the length of the buffer 510 * @srcp: the cpumask to print 511 * 512 * If len is zero, returns zero. Otherwise returns the length of the 513 * (nul-terminated) @buf string. 514 */ 515 static inline int cpumask_scnprintf(char *buf, int len, 516 const struct cpumask *srcp) 517 { 518 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits); 519 } 520 521 /** 522 * cpumask_parse_user - extract a cpumask from a user string 523 * @buf: the buffer to extract from 524 * @len: the length of the buffer 525 * @dstp: the cpumask to set. 526 * 527 * Returns -errno, or 0 for success. 528 */ 529 static inline int cpumask_parse_user(const char __user *buf, int len, 530 struct cpumask *dstp) 531 { 532 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); 533 } 534 535 /** 536 * cpulist_scnprintf - print a cpumask into a string as comma-separated list 537 * @buf: the buffer to sprintf into 538 * @len: the length of the buffer 539 * @srcp: the cpumask to print 540 * 541 * If len is zero, returns zero. Otherwise returns the length of the 542 * (nul-terminated) @buf string. 543 */ 544 static inline int cpulist_scnprintf(char *buf, int len, 545 const struct cpumask *srcp) 546 { 547 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp), 548 nr_cpumask_bits); 549 } 550 551 /** 552 * cpulist_parse_user - extract a cpumask from a user string of ranges 553 * @buf: the buffer to extract from 554 * @len: the length of the buffer 555 * @dstp: the cpumask to set. 556 * 557 * Returns -errno, or 0 for success. 558 */ 559 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 560 { 561 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); 562 } 563 564 /** 565 * cpumask_size - size to allocate for a 'struct cpumask' in bytes 566 * 567 * This will eventually be a runtime variable, depending on nr_cpu_ids. 568 */ 569 static inline size_t cpumask_size(void) 570 { 571 /* FIXME: Once all cpumask assignments are eliminated, this 572 * can be nr_cpumask_bits */ 573 return BITS_TO_LONGS(NR_CPUS) * sizeof(long); 574 } 575 576 /* 577 * cpumask_var_t: struct cpumask for stack usage. 578 * 579 * Oh, the wicked games we play! In order to make kernel coding a 580 * little more difficult, we typedef cpumask_var_t to an array or a 581 * pointer: doing &mask on an array is a noop, so it still works. 582 * 583 * ie. 584 * cpumask_var_t tmpmask; 585 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 586 * return -ENOMEM; 587 * 588 * ... use 'tmpmask' like a normal struct cpumask * ... 589 * 590 * free_cpumask_var(tmpmask); 591 */ 592 #ifdef CONFIG_CPUMASK_OFFSTACK 593 typedef struct cpumask *cpumask_var_t; 594 595 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 596 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 597 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 598 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 599 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 600 void free_cpumask_var(cpumask_var_t mask); 601 void free_bootmem_cpumask_var(cpumask_var_t mask); 602 603 #else 604 typedef struct cpumask cpumask_var_t[1]; 605 606 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 607 { 608 return true; 609 } 610 611 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 612 int node) 613 { 614 return true; 615 } 616 617 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 618 { 619 cpumask_clear(*mask); 620 return true; 621 } 622 623 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 624 int node) 625 { 626 cpumask_clear(*mask); 627 return true; 628 } 629 630 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 631 { 632 } 633 634 static inline void free_cpumask_var(cpumask_var_t mask) 635 { 636 } 637 638 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 639 { 640 } 641 #endif /* CONFIG_CPUMASK_OFFSTACK */ 642 643 /* It's common to want to use cpu_all_mask in struct member initializers, 644 * so it has to refer to an address rather than a pointer. */ 645 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 646 #define cpu_all_mask to_cpumask(cpu_all_bits) 647 648 /* First bits of cpu_bit_bitmap are in fact unset. */ 649 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 650 651 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 652 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 653 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 654 655 /* Wrappers for arch boot code to manipulate normally-constant masks */ 656 void set_cpu_possible(unsigned int cpu, bool possible); 657 void set_cpu_present(unsigned int cpu, bool present); 658 void set_cpu_online(unsigned int cpu, bool online); 659 void set_cpu_active(unsigned int cpu, bool active); 660 void init_cpu_present(const struct cpumask *src); 661 void init_cpu_possible(const struct cpumask *src); 662 void init_cpu_online(const struct cpumask *src); 663 664 /** 665 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * 666 * @bitmap: the bitmap 667 * 668 * There are a few places where cpumask_var_t isn't appropriate and 669 * static cpumasks must be used (eg. very early boot), yet we don't 670 * expose the definition of 'struct cpumask'. 671 * 672 * This does the conversion, and can be used as a constant initializer. 673 */ 674 #define to_cpumask(bitmap) \ 675 ((struct cpumask *)(1 ? (bitmap) \ 676 : (void *)sizeof(__check_is_bitmap(bitmap)))) 677 678 static inline int __check_is_bitmap(const unsigned long *bitmap) 679 { 680 return 1; 681 } 682 683 /* 684 * Special-case data structure for "single bit set only" constant CPU masks. 685 * 686 * We pre-generate all the 64 (or 32) possible bit positions, with enough 687 * padding to the left and the right, and return the constant pointer 688 * appropriately offset. 689 */ 690 extern const unsigned long 691 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 692 693 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 694 { 695 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 696 p -= cpu / BITS_PER_LONG; 697 return to_cpumask(p); 698 } 699 700 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 701 702 #if NR_CPUS <= BITS_PER_LONG 703 #define CPU_BITS_ALL \ 704 { \ 705 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 706 } 707 708 #else /* NR_CPUS > BITS_PER_LONG */ 709 710 #define CPU_BITS_ALL \ 711 { \ 712 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 713 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 714 } 715 #endif /* NR_CPUS > BITS_PER_LONG */ 716 717 /* 718 * 719 * From here down, all obsolete. Use cpumask_ variants! 720 * 721 */ 722 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 723 /* These strip const, as traditionally they weren't const. */ 724 #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask) 725 #define cpu_online_map (*(cpumask_t *)cpu_online_mask) 726 #define cpu_present_map (*(cpumask_t *)cpu_present_mask) 727 #define cpu_active_map (*(cpumask_t *)cpu_active_mask) 728 729 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu)) 730 731 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS) 732 733 #if NR_CPUS <= BITS_PER_LONG 734 735 #define CPU_MASK_ALL \ 736 (cpumask_t) { { \ 737 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 738 } } 739 740 #else 741 742 #define CPU_MASK_ALL \ 743 (cpumask_t) { { \ 744 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 745 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 746 } } 747 748 #endif 749 750 #define CPU_MASK_NONE \ 751 (cpumask_t) { { \ 752 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 753 } } 754 755 #define CPU_MASK_CPU0 \ 756 (cpumask_t) { { \ 757 [0] = 1UL \ 758 } } 759 760 #if NR_CPUS == 1 761 #define first_cpu(src) ({ (void)(src); 0; }) 762 #define next_cpu(n, src) ({ (void)(src); 1; }) 763 #define any_online_cpu(mask) 0 764 #define for_each_cpu_mask(cpu, mask) \ 765 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 766 #else /* NR_CPUS > 1 */ 767 int __first_cpu(const cpumask_t *srcp); 768 int __next_cpu(int n, const cpumask_t *srcp); 769 int __any_online_cpu(const cpumask_t *mask); 770 771 #define first_cpu(src) __first_cpu(&(src)) 772 #define next_cpu(n, src) __next_cpu((n), &(src)) 773 #define any_online_cpu(mask) __any_online_cpu(&(mask)) 774 #define for_each_cpu_mask(cpu, mask) \ 775 for ((cpu) = -1; \ 776 (cpu) = next_cpu((cpu), (mask)), \ 777 (cpu) < NR_CPUS; ) 778 #endif /* SMP */ 779 780 #if NR_CPUS <= 64 781 782 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask) 783 784 #else /* NR_CPUS > 64 */ 785 786 int __next_cpu_nr(int n, const cpumask_t *srcp); 787 #define for_each_cpu_mask_nr(cpu, mask) \ 788 for ((cpu) = -1; \ 789 (cpu) = __next_cpu_nr((cpu), &(mask)), \ 790 (cpu) < nr_cpu_ids; ) 791 792 #endif /* NR_CPUS > 64 */ 793 794 #define cpus_addr(src) ((src).bits) 795 796 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) 797 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) 798 { 799 set_bit(cpu, dstp->bits); 800 } 801 802 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) 803 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) 804 { 805 clear_bit(cpu, dstp->bits); 806 } 807 808 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) 809 static inline void __cpus_setall(cpumask_t *dstp, int nbits) 810 { 811 bitmap_fill(dstp->bits, nbits); 812 } 813 814 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) 815 static inline void __cpus_clear(cpumask_t *dstp, int nbits) 816 { 817 bitmap_zero(dstp->bits, nbits); 818 } 819 820 /* No static inline type checking - see Subtlety (1) above. */ 821 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits) 822 823 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) 824 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) 825 { 826 return test_and_set_bit(cpu, addr->bits); 827 } 828 829 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) 830 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p, 831 const cpumask_t *src2p, int nbits) 832 { 833 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); 834 } 835 836 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) 837 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p, 838 const cpumask_t *src2p, int nbits) 839 { 840 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); 841 } 842 843 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) 844 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p, 845 const cpumask_t *src2p, int nbits) 846 { 847 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); 848 } 849 850 #define cpus_andnot(dst, src1, src2) \ 851 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) 852 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p, 853 const cpumask_t *src2p, int nbits) 854 { 855 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); 856 } 857 858 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) 859 static inline int __cpus_equal(const cpumask_t *src1p, 860 const cpumask_t *src2p, int nbits) 861 { 862 return bitmap_equal(src1p->bits, src2p->bits, nbits); 863 } 864 865 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) 866 static inline int __cpus_intersects(const cpumask_t *src1p, 867 const cpumask_t *src2p, int nbits) 868 { 869 return bitmap_intersects(src1p->bits, src2p->bits, nbits); 870 } 871 872 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) 873 static inline int __cpus_subset(const cpumask_t *src1p, 874 const cpumask_t *src2p, int nbits) 875 { 876 return bitmap_subset(src1p->bits, src2p->bits, nbits); 877 } 878 879 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) 880 static inline int __cpus_empty(const cpumask_t *srcp, int nbits) 881 { 882 return bitmap_empty(srcp->bits, nbits); 883 } 884 885 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) 886 static inline int __cpus_weight(const cpumask_t *srcp, int nbits) 887 { 888 return bitmap_weight(srcp->bits, nbits); 889 } 890 891 #define cpus_shift_left(dst, src, n) \ 892 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) 893 static inline void __cpus_shift_left(cpumask_t *dstp, 894 const cpumask_t *srcp, int n, int nbits) 895 { 896 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); 897 } 898 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ 899 900 #endif /* __LINUX_CPUMASK_H */ 901