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() 1U 94 #define num_possible_cpus() 1U 95 #define num_present_cpus() 1U 96 #define num_active_cpus() 1U 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_not(cpu, mask) \ 147 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 148 #define for_each_cpu_and(cpu, mask, and) \ 149 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) 150 #else 151 /** 152 * cpumask_first - get the first cpu in a cpumask 153 * @srcp: the cpumask pointer 154 * 155 * Returns >= nr_cpu_ids if no cpus set. 156 */ 157 static inline unsigned int cpumask_first(const struct cpumask *srcp) 158 { 159 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); 160 } 161 162 /** 163 * cpumask_next - get the next cpu in a cpumask 164 * @n: the cpu prior to the place to search (ie. return will be > @n) 165 * @srcp: the cpumask pointer 166 * 167 * Returns >= nr_cpu_ids if no further cpus set. 168 */ 169 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 170 { 171 /* -1 is a legal arg here. */ 172 if (n != -1) 173 cpumask_check(n); 174 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 175 } 176 177 /** 178 * cpumask_next_zero - get the next unset cpu in a cpumask 179 * @n: the cpu prior to the place to search (ie. return will be > @n) 180 * @srcp: the cpumask pointer 181 * 182 * Returns >= nr_cpu_ids if no further cpus unset. 183 */ 184 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 185 { 186 /* -1 is a legal arg here. */ 187 if (n != -1) 188 cpumask_check(n); 189 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 190 } 191 192 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); 193 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); 194 195 /** 196 * for_each_cpu - iterate over every cpu in a mask 197 * @cpu: the (optionally unsigned) integer iterator 198 * @mask: the cpumask pointer 199 * 200 * After the loop, cpu is >= nr_cpu_ids. 201 */ 202 #define for_each_cpu(cpu, mask) \ 203 for ((cpu) = -1; \ 204 (cpu) = cpumask_next((cpu), (mask)), \ 205 (cpu) < nr_cpu_ids;) 206 207 /** 208 * for_each_cpu_not - iterate over every cpu in a complemented mask 209 * @cpu: the (optionally unsigned) integer iterator 210 * @mask: the cpumask pointer 211 * 212 * After the loop, cpu is >= nr_cpu_ids. 213 */ 214 #define for_each_cpu_not(cpu, mask) \ 215 for ((cpu) = -1; \ 216 (cpu) = cpumask_next_zero((cpu), (mask)), \ 217 (cpu) < nr_cpu_ids;) 218 219 /** 220 * for_each_cpu_and - iterate over every cpu in both masks 221 * @cpu: the (optionally unsigned) integer iterator 222 * @mask: the first cpumask pointer 223 * @and: the second cpumask pointer 224 * 225 * This saves a temporary CPU mask in many places. It is equivalent to: 226 * struct cpumask tmp; 227 * cpumask_and(&tmp, &mask, &and); 228 * for_each_cpu(cpu, &tmp) 229 * ... 230 * 231 * After the loop, cpu is >= nr_cpu_ids. 232 */ 233 #define for_each_cpu_and(cpu, mask, and) \ 234 for ((cpu) = -1; \ 235 (cpu) = cpumask_next_and((cpu), (mask), (and)), \ 236 (cpu) < nr_cpu_ids;) 237 #endif /* SMP */ 238 239 #define CPU_BITS_NONE \ 240 { \ 241 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 242 } 243 244 #define CPU_BITS_CPU0 \ 245 { \ 246 [0] = 1UL \ 247 } 248 249 /** 250 * cpumask_set_cpu - set a cpu in a cpumask 251 * @cpu: cpu number (< nr_cpu_ids) 252 * @dstp: the cpumask pointer 253 */ 254 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 255 { 256 set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 257 } 258 259 /** 260 * cpumask_clear_cpu - clear a cpu in a cpumask 261 * @cpu: cpu number (< nr_cpu_ids) 262 * @dstp: the cpumask pointer 263 */ 264 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) 265 { 266 clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 267 } 268 269 /** 270 * cpumask_test_cpu - test for a cpu in a cpumask 271 * @cpu: cpu number (< nr_cpu_ids) 272 * @cpumask: the cpumask pointer 273 * 274 * No static inline type checking - see Subtlety (1) above. 275 */ 276 #define cpumask_test_cpu(cpu, cpumask) \ 277 test_bit(cpumask_check(cpu), cpumask_bits((cpumask))) 278 279 /** 280 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 281 * @cpu: cpu number (< nr_cpu_ids) 282 * @cpumask: the cpumask pointer 283 * 284 * test_and_set_bit wrapper for cpumasks. 285 */ 286 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 287 { 288 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 289 } 290 291 /** 292 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 293 * @cpu: cpu number (< nr_cpu_ids) 294 * @cpumask: the cpumask pointer 295 * 296 * test_and_clear_bit wrapper for cpumasks. 297 */ 298 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 299 { 300 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 301 } 302 303 /** 304 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 305 * @dstp: the cpumask pointer 306 */ 307 static inline void cpumask_setall(struct cpumask *dstp) 308 { 309 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 310 } 311 312 /** 313 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 314 * @dstp: the cpumask pointer 315 */ 316 static inline void cpumask_clear(struct cpumask *dstp) 317 { 318 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); 319 } 320 321 /** 322 * cpumask_and - *dstp = *src1p & *src2p 323 * @dstp: the cpumask result 324 * @src1p: the first input 325 * @src2p: the second input 326 */ 327 static inline int cpumask_and(struct cpumask *dstp, 328 const struct cpumask *src1p, 329 const struct cpumask *src2p) 330 { 331 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 332 cpumask_bits(src2p), nr_cpumask_bits); 333 } 334 335 /** 336 * cpumask_or - *dstp = *src1p | *src2p 337 * @dstp: the cpumask result 338 * @src1p: the first input 339 * @src2p: the second input 340 */ 341 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 342 const struct cpumask *src2p) 343 { 344 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 345 cpumask_bits(src2p), nr_cpumask_bits); 346 } 347 348 /** 349 * cpumask_xor - *dstp = *src1p ^ *src2p 350 * @dstp: the cpumask result 351 * @src1p: the first input 352 * @src2p: the second input 353 */ 354 static inline void cpumask_xor(struct cpumask *dstp, 355 const struct cpumask *src1p, 356 const struct cpumask *src2p) 357 { 358 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 359 cpumask_bits(src2p), nr_cpumask_bits); 360 } 361 362 /** 363 * cpumask_andnot - *dstp = *src1p & ~*src2p 364 * @dstp: the cpumask result 365 * @src1p: the first input 366 * @src2p: the second input 367 */ 368 static inline int cpumask_andnot(struct cpumask *dstp, 369 const struct cpumask *src1p, 370 const struct cpumask *src2p) 371 { 372 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 373 cpumask_bits(src2p), nr_cpumask_bits); 374 } 375 376 /** 377 * cpumask_complement - *dstp = ~*srcp 378 * @dstp: the cpumask result 379 * @srcp: the input to invert 380 */ 381 static inline void cpumask_complement(struct cpumask *dstp, 382 const struct cpumask *srcp) 383 { 384 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), 385 nr_cpumask_bits); 386 } 387 388 /** 389 * cpumask_equal - *src1p == *src2p 390 * @src1p: the first input 391 * @src2p: the second input 392 */ 393 static inline bool cpumask_equal(const struct cpumask *src1p, 394 const struct cpumask *src2p) 395 { 396 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 397 nr_cpumask_bits); 398 } 399 400 /** 401 * cpumask_intersects - (*src1p & *src2p) != 0 402 * @src1p: the first input 403 * @src2p: the second input 404 */ 405 static inline bool cpumask_intersects(const struct cpumask *src1p, 406 const struct cpumask *src2p) 407 { 408 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 409 nr_cpumask_bits); 410 } 411 412 /** 413 * cpumask_subset - (*src1p & ~*src2p) == 0 414 * @src1p: the first input 415 * @src2p: the second input 416 */ 417 static inline int cpumask_subset(const struct cpumask *src1p, 418 const struct cpumask *src2p) 419 { 420 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 421 nr_cpumask_bits); 422 } 423 424 /** 425 * cpumask_empty - *srcp == 0 426 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 427 */ 428 static inline bool cpumask_empty(const struct cpumask *srcp) 429 { 430 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); 431 } 432 433 /** 434 * cpumask_full - *srcp == 0xFFFFFFFF... 435 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 436 */ 437 static inline bool cpumask_full(const struct cpumask *srcp) 438 { 439 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 440 } 441 442 /** 443 * cpumask_weight - Count of bits in *srcp 444 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 445 */ 446 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 447 { 448 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); 449 } 450 451 /** 452 * cpumask_shift_right - *dstp = *srcp >> n 453 * @dstp: the cpumask result 454 * @srcp: the input to shift 455 * @n: the number of bits to shift by 456 */ 457 static inline void cpumask_shift_right(struct cpumask *dstp, 458 const struct cpumask *srcp, int n) 459 { 460 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 461 nr_cpumask_bits); 462 } 463 464 /** 465 * cpumask_shift_left - *dstp = *srcp << n 466 * @dstp: the cpumask result 467 * @srcp: the input to shift 468 * @n: the number of bits to shift by 469 */ 470 static inline void cpumask_shift_left(struct cpumask *dstp, 471 const struct cpumask *srcp, int n) 472 { 473 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 474 nr_cpumask_bits); 475 } 476 477 /** 478 * cpumask_copy - *dstp = *srcp 479 * @dstp: the result 480 * @srcp: the input cpumask 481 */ 482 static inline void cpumask_copy(struct cpumask *dstp, 483 const struct cpumask *srcp) 484 { 485 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); 486 } 487 488 /** 489 * cpumask_any - pick a "random" cpu from *srcp 490 * @srcp: the input cpumask 491 * 492 * Returns >= nr_cpu_ids if no cpus set. 493 */ 494 #define cpumask_any(srcp) cpumask_first(srcp) 495 496 /** 497 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 498 * @src1p: the first input 499 * @src2p: the second input 500 * 501 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 502 */ 503 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) 504 505 /** 506 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 507 * @mask1: the first input cpumask 508 * @mask2: the second input cpumask 509 * 510 * Returns >= nr_cpu_ids if no cpus set. 511 */ 512 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 513 514 /** 515 * cpumask_of - the cpumask containing just a given cpu 516 * @cpu: the cpu (<= nr_cpu_ids) 517 */ 518 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 519 520 /** 521 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex 522 * @buf: the buffer to sprintf into 523 * @len: the length of the buffer 524 * @srcp: the cpumask to print 525 * 526 * If len is zero, returns zero. Otherwise returns the length of the 527 * (nul-terminated) @buf string. 528 */ 529 static inline int cpumask_scnprintf(char *buf, int len, 530 const struct cpumask *srcp) 531 { 532 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits); 533 } 534 535 /** 536 * cpumask_parse_user - extract a cpumask from a user string 537 * @buf: the buffer to extract from 538 * @len: the length of the buffer 539 * @dstp: the cpumask to set. 540 * 541 * Returns -errno, or 0 for success. 542 */ 543 static inline int cpumask_parse_user(const char __user *buf, int len, 544 struct cpumask *dstp) 545 { 546 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); 547 } 548 549 /** 550 * cpulist_scnprintf - print a cpumask into a string as comma-separated list 551 * @buf: the buffer to sprintf into 552 * @len: the length of the buffer 553 * @srcp: the cpumask to print 554 * 555 * If len is zero, returns zero. Otherwise returns the length of the 556 * (nul-terminated) @buf string. 557 */ 558 static inline int cpulist_scnprintf(char *buf, int len, 559 const struct cpumask *srcp) 560 { 561 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp), 562 nr_cpumask_bits); 563 } 564 565 /** 566 * cpulist_parse_user - extract a cpumask from a user string of ranges 567 * @buf: the buffer to extract from 568 * @len: the length of the buffer 569 * @dstp: the cpumask to set. 570 * 571 * Returns -errno, or 0 for success. 572 */ 573 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 574 { 575 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); 576 } 577 578 /** 579 * cpumask_size - size to allocate for a 'struct cpumask' in bytes 580 * 581 * This will eventually be a runtime variable, depending on nr_cpu_ids. 582 */ 583 static inline size_t cpumask_size(void) 584 { 585 /* FIXME: Once all cpumask assignments are eliminated, this 586 * can be nr_cpumask_bits */ 587 return BITS_TO_LONGS(NR_CPUS) * sizeof(long); 588 } 589 590 /* 591 * cpumask_var_t: struct cpumask for stack usage. 592 * 593 * Oh, the wicked games we play! In order to make kernel coding a 594 * little more difficult, we typedef cpumask_var_t to an array or a 595 * pointer: doing &mask on an array is a noop, so it still works. 596 * 597 * ie. 598 * cpumask_var_t tmpmask; 599 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 600 * return -ENOMEM; 601 * 602 * ... use 'tmpmask' like a normal struct cpumask * ... 603 * 604 * free_cpumask_var(tmpmask); 605 */ 606 #ifdef CONFIG_CPUMASK_OFFSTACK 607 typedef struct cpumask *cpumask_var_t; 608 609 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 610 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 611 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 612 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 613 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 614 void free_cpumask_var(cpumask_var_t mask); 615 void free_bootmem_cpumask_var(cpumask_var_t mask); 616 617 #else 618 typedef struct cpumask cpumask_var_t[1]; 619 620 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 621 { 622 return true; 623 } 624 625 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 626 int node) 627 { 628 return true; 629 } 630 631 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 632 { 633 cpumask_clear(*mask); 634 return true; 635 } 636 637 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 638 int node) 639 { 640 cpumask_clear(*mask); 641 return true; 642 } 643 644 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 645 { 646 } 647 648 static inline void free_cpumask_var(cpumask_var_t mask) 649 { 650 } 651 652 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 653 { 654 } 655 #endif /* CONFIG_CPUMASK_OFFSTACK */ 656 657 /* It's common to want to use cpu_all_mask in struct member initializers, 658 * so it has to refer to an address rather than a pointer. */ 659 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 660 #define cpu_all_mask to_cpumask(cpu_all_bits) 661 662 /* First bits of cpu_bit_bitmap are in fact unset. */ 663 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 664 665 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 666 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 667 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 668 669 /* Wrappers for arch boot code to manipulate normally-constant masks */ 670 void set_cpu_possible(unsigned int cpu, bool possible); 671 void set_cpu_present(unsigned int cpu, bool present); 672 void set_cpu_online(unsigned int cpu, bool online); 673 void set_cpu_active(unsigned int cpu, bool active); 674 void init_cpu_present(const struct cpumask *src); 675 void init_cpu_possible(const struct cpumask *src); 676 void init_cpu_online(const struct cpumask *src); 677 678 /** 679 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * 680 * @bitmap: the bitmap 681 * 682 * There are a few places where cpumask_var_t isn't appropriate and 683 * static cpumasks must be used (eg. very early boot), yet we don't 684 * expose the definition of 'struct cpumask'. 685 * 686 * This does the conversion, and can be used as a constant initializer. 687 */ 688 #define to_cpumask(bitmap) \ 689 ((struct cpumask *)(1 ? (bitmap) \ 690 : (void *)sizeof(__check_is_bitmap(bitmap)))) 691 692 static inline int __check_is_bitmap(const unsigned long *bitmap) 693 { 694 return 1; 695 } 696 697 /* 698 * Special-case data structure for "single bit set only" constant CPU masks. 699 * 700 * We pre-generate all the 64 (or 32) possible bit positions, with enough 701 * padding to the left and the right, and return the constant pointer 702 * appropriately offset. 703 */ 704 extern const unsigned long 705 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 706 707 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 708 { 709 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 710 p -= cpu / BITS_PER_LONG; 711 return to_cpumask(p); 712 } 713 714 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 715 716 #if NR_CPUS <= BITS_PER_LONG 717 #define CPU_BITS_ALL \ 718 { \ 719 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 720 } 721 722 #else /* NR_CPUS > BITS_PER_LONG */ 723 724 #define CPU_BITS_ALL \ 725 { \ 726 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 727 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 728 } 729 #endif /* NR_CPUS > BITS_PER_LONG */ 730 731 /* 732 * 733 * From here down, all obsolete. Use cpumask_ variants! 734 * 735 */ 736 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 737 /* These strip const, as traditionally they weren't const. */ 738 #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask) 739 #define cpu_online_map (*(cpumask_t *)cpu_online_mask) 740 #define cpu_present_map (*(cpumask_t *)cpu_present_mask) 741 #define cpu_active_map (*(cpumask_t *)cpu_active_mask) 742 743 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu)) 744 745 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS) 746 747 #if NR_CPUS <= BITS_PER_LONG 748 749 #define CPU_MASK_ALL \ 750 (cpumask_t) { { \ 751 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 752 } } 753 754 #else 755 756 #define CPU_MASK_ALL \ 757 (cpumask_t) { { \ 758 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 759 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 760 } } 761 762 #endif 763 764 #define CPU_MASK_NONE \ 765 (cpumask_t) { { \ 766 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 767 } } 768 769 #define CPU_MASK_CPU0 \ 770 (cpumask_t) { { \ 771 [0] = 1UL \ 772 } } 773 774 #if NR_CPUS == 1 775 #define first_cpu(src) ({ (void)(src); 0; }) 776 #define next_cpu(n, src) ({ (void)(src); 1; }) 777 #define any_online_cpu(mask) 0 778 #define for_each_cpu_mask(cpu, mask) \ 779 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 780 #else /* NR_CPUS > 1 */ 781 int __first_cpu(const cpumask_t *srcp); 782 int __next_cpu(int n, const cpumask_t *srcp); 783 int __any_online_cpu(const cpumask_t *mask); 784 785 #define first_cpu(src) __first_cpu(&(src)) 786 #define next_cpu(n, src) __next_cpu((n), &(src)) 787 #define any_online_cpu(mask) __any_online_cpu(&(mask)) 788 #define for_each_cpu_mask(cpu, mask) \ 789 for ((cpu) = -1; \ 790 (cpu) = next_cpu((cpu), (mask)), \ 791 (cpu) < NR_CPUS; ) 792 #endif /* SMP */ 793 794 #if NR_CPUS <= 64 795 796 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask) 797 798 #else /* NR_CPUS > 64 */ 799 800 int __next_cpu_nr(int n, const cpumask_t *srcp); 801 #define for_each_cpu_mask_nr(cpu, mask) \ 802 for ((cpu) = -1; \ 803 (cpu) = __next_cpu_nr((cpu), &(mask)), \ 804 (cpu) < nr_cpu_ids; ) 805 806 #endif /* NR_CPUS > 64 */ 807 808 #define cpus_addr(src) ((src).bits) 809 810 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) 811 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) 812 { 813 set_bit(cpu, dstp->bits); 814 } 815 816 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) 817 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) 818 { 819 clear_bit(cpu, dstp->bits); 820 } 821 822 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) 823 static inline void __cpus_setall(cpumask_t *dstp, int nbits) 824 { 825 bitmap_fill(dstp->bits, nbits); 826 } 827 828 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) 829 static inline void __cpus_clear(cpumask_t *dstp, int nbits) 830 { 831 bitmap_zero(dstp->bits, nbits); 832 } 833 834 /* No static inline type checking - see Subtlety (1) above. */ 835 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits) 836 837 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) 838 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) 839 { 840 return test_and_set_bit(cpu, addr->bits); 841 } 842 843 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) 844 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p, 845 const cpumask_t *src2p, int nbits) 846 { 847 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); 848 } 849 850 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) 851 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p, 852 const cpumask_t *src2p, int nbits) 853 { 854 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); 855 } 856 857 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) 858 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p, 859 const cpumask_t *src2p, int nbits) 860 { 861 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); 862 } 863 864 #define cpus_andnot(dst, src1, src2) \ 865 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) 866 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p, 867 const cpumask_t *src2p, int nbits) 868 { 869 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); 870 } 871 872 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) 873 static inline int __cpus_equal(const cpumask_t *src1p, 874 const cpumask_t *src2p, int nbits) 875 { 876 return bitmap_equal(src1p->bits, src2p->bits, nbits); 877 } 878 879 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) 880 static inline int __cpus_intersects(const cpumask_t *src1p, 881 const cpumask_t *src2p, int nbits) 882 { 883 return bitmap_intersects(src1p->bits, src2p->bits, nbits); 884 } 885 886 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) 887 static inline int __cpus_subset(const cpumask_t *src1p, 888 const cpumask_t *src2p, int nbits) 889 { 890 return bitmap_subset(src1p->bits, src2p->bits, nbits); 891 } 892 893 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) 894 static inline int __cpus_empty(const cpumask_t *srcp, int nbits) 895 { 896 return bitmap_empty(srcp->bits, nbits); 897 } 898 899 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) 900 static inline int __cpus_weight(const cpumask_t *srcp, int nbits) 901 { 902 return bitmap_weight(srcp->bits, nbits); 903 } 904 905 #define cpus_shift_left(dst, src, n) \ 906 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) 907 static inline void __cpus_shift_left(cpumask_t *dstp, 908 const cpumask_t *srcp, int n, int nbits) 909 { 910 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); 911 } 912 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ 913 914 #endif /* __LINUX_CPUMASK_H */ 915