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 #include <linux/bug.h> 13 14 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; 15 16 /** 17 * cpumask_bits - get the bits in a cpumask 18 * @maskp: the struct cpumask * 19 * 20 * You should only assume nr_cpu_ids bits of this mask are valid. This is 21 * a macro so it's const-correct. 22 */ 23 #define cpumask_bits(maskp) ((maskp)->bits) 24 25 /** 26 * cpumask_pr_args - printf args to output a cpumask 27 * @maskp: cpumask to be printed 28 * 29 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask. 30 */ 31 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp) 32 33 #if NR_CPUS == 1 34 #define nr_cpu_ids 1 35 #else 36 extern int nr_cpu_ids; 37 #endif 38 39 #ifdef CONFIG_CPUMASK_OFFSTACK 40 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also, 41 * not all bits may be allocated. */ 42 #define nr_cpumask_bits nr_cpu_ids 43 #else 44 #define nr_cpumask_bits NR_CPUS 45 #endif 46 47 /* 48 * The following particular system cpumasks and operations manage 49 * possible, present, active and online cpus. 50 * 51 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable 52 * cpu_present_mask - has bit 'cpu' set iff cpu is populated 53 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler 54 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration 55 * 56 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. 57 * 58 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's 59 * that it is possible might ever be plugged in at anytime during the 60 * life of that system boot. The cpu_present_mask is dynamic(*), 61 * representing which CPUs are currently plugged in. And 62 * cpu_online_mask is the dynamic subset of cpu_present_mask, 63 * indicating those CPUs available for scheduling. 64 * 65 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have 66 * all NR_CPUS bits set, otherwise it is just the set of CPUs that 67 * ACPI reports present at boot. 68 * 69 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, 70 * depending on what ACPI reports as currently plugged in, otherwise 71 * cpu_present_mask is just a copy of cpu_possible_mask. 72 * 73 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not 74 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. 75 * 76 * Subtleties: 77 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode 78 * assumption that their single CPU is online. The UP 79 * cpu_{online,possible,present}_masks are placebos. Changing them 80 * will have no useful affect on the following num_*_cpus() 81 * and cpu_*() macros in the UP case. This ugliness is a UP 82 * optimization - don't waste any instructions or memory references 83 * asking if you're online or how many CPUs there are if there is 84 * only one CPU. 85 */ 86 87 extern const struct cpumask *const cpu_possible_mask; 88 extern const struct cpumask *const cpu_online_mask; 89 extern const struct cpumask *const cpu_present_mask; 90 extern const struct cpumask *const cpu_active_mask; 91 92 #if NR_CPUS > 1 93 #define num_online_cpus() cpumask_weight(cpu_online_mask) 94 #define num_possible_cpus() cpumask_weight(cpu_possible_mask) 95 #define num_present_cpus() cpumask_weight(cpu_present_mask) 96 #define num_active_cpus() cpumask_weight(cpu_active_mask) 97 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) 98 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) 99 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) 100 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) 101 #else 102 #define num_online_cpus() 1U 103 #define num_possible_cpus() 1U 104 #define num_present_cpus() 1U 105 #define num_active_cpus() 1U 106 #define cpu_online(cpu) ((cpu) == 0) 107 #define cpu_possible(cpu) ((cpu) == 0) 108 #define cpu_present(cpu) ((cpu) == 0) 109 #define cpu_active(cpu) ((cpu) == 0) 110 #endif 111 112 /* verify cpu argument to cpumask_* operators */ 113 static inline unsigned int cpumask_check(unsigned int cpu) 114 { 115 #ifdef CONFIG_DEBUG_PER_CPU_MAPS 116 WARN_ON_ONCE(cpu >= nr_cpumask_bits); 117 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ 118 return cpu; 119 } 120 121 #if NR_CPUS == 1 122 /* Uniprocessor. Assume all masks are "1". */ 123 static inline unsigned int cpumask_first(const struct cpumask *srcp) 124 { 125 return 0; 126 } 127 128 /* Valid inputs for n are -1 and 0. */ 129 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 130 { 131 return n+1; 132 } 133 134 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 135 { 136 return n+1; 137 } 138 139 static inline unsigned int cpumask_next_and(int n, 140 const struct cpumask *srcp, 141 const struct cpumask *andp) 142 { 143 return n+1; 144 } 145 146 /* cpu must be a valid cpu, ie 0, so there's no other choice. */ 147 static inline unsigned int cpumask_any_but(const struct cpumask *mask, 148 unsigned int cpu) 149 { 150 return 1; 151 } 152 153 static inline int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp) 154 { 155 set_bit(0, cpumask_bits(dstp)); 156 157 return 0; 158 } 159 160 #define for_each_cpu(cpu, mask) \ 161 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 162 #define for_each_cpu_not(cpu, mask) \ 163 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 164 #define for_each_cpu_and(cpu, mask, and) \ 165 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) 166 #else 167 /** 168 * cpumask_first - get the first cpu in a cpumask 169 * @srcp: the cpumask pointer 170 * 171 * Returns >= nr_cpu_ids if no cpus set. 172 */ 173 static inline unsigned int cpumask_first(const struct cpumask *srcp) 174 { 175 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); 176 } 177 178 /** 179 * cpumask_next - get the next cpu in a cpumask 180 * @n: the cpu prior to the place to search (ie. return will be > @n) 181 * @srcp: the cpumask pointer 182 * 183 * Returns >= nr_cpu_ids if no further cpus set. 184 */ 185 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 186 { 187 /* -1 is a legal arg here. */ 188 if (n != -1) 189 cpumask_check(n); 190 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 191 } 192 193 /** 194 * cpumask_next_zero - get the next unset cpu in a cpumask 195 * @n: the cpu prior to the place to search (ie. return will be > @n) 196 * @srcp: the cpumask pointer 197 * 198 * Returns >= nr_cpu_ids if no further cpus unset. 199 */ 200 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 201 { 202 /* -1 is a legal arg here. */ 203 if (n != -1) 204 cpumask_check(n); 205 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 206 } 207 208 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); 209 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); 210 int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp); 211 212 /** 213 * for_each_cpu - iterate over every cpu in a mask 214 * @cpu: the (optionally unsigned) integer iterator 215 * @mask: the cpumask pointer 216 * 217 * After the loop, cpu is >= nr_cpu_ids. 218 */ 219 #define for_each_cpu(cpu, mask) \ 220 for ((cpu) = -1; \ 221 (cpu) = cpumask_next((cpu), (mask)), \ 222 (cpu) < nr_cpu_ids;) 223 224 /** 225 * for_each_cpu_not - iterate over every cpu in a complemented mask 226 * @cpu: the (optionally unsigned) integer iterator 227 * @mask: the cpumask pointer 228 * 229 * After the loop, cpu is >= nr_cpu_ids. 230 */ 231 #define for_each_cpu_not(cpu, mask) \ 232 for ((cpu) = -1; \ 233 (cpu) = cpumask_next_zero((cpu), (mask)), \ 234 (cpu) < nr_cpu_ids;) 235 236 /** 237 * for_each_cpu_and - iterate over every cpu in both masks 238 * @cpu: the (optionally unsigned) integer iterator 239 * @mask: the first cpumask pointer 240 * @and: the second cpumask pointer 241 * 242 * This saves a temporary CPU mask in many places. It is equivalent to: 243 * struct cpumask tmp; 244 * cpumask_and(&tmp, &mask, &and); 245 * for_each_cpu(cpu, &tmp) 246 * ... 247 * 248 * After the loop, cpu is >= nr_cpu_ids. 249 */ 250 #define for_each_cpu_and(cpu, mask, and) \ 251 for ((cpu) = -1; \ 252 (cpu) = cpumask_next_and((cpu), (mask), (and)), \ 253 (cpu) < nr_cpu_ids;) 254 #endif /* SMP */ 255 256 #define CPU_BITS_NONE \ 257 { \ 258 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 259 } 260 261 #define CPU_BITS_CPU0 \ 262 { \ 263 [0] = 1UL \ 264 } 265 266 /** 267 * cpumask_set_cpu - set a cpu in a cpumask 268 * @cpu: cpu number (< nr_cpu_ids) 269 * @dstp: the cpumask pointer 270 */ 271 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 272 { 273 set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 274 } 275 276 /** 277 * cpumask_clear_cpu - clear a cpu in a cpumask 278 * @cpu: cpu number (< nr_cpu_ids) 279 * @dstp: the cpumask pointer 280 */ 281 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) 282 { 283 clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 284 } 285 286 /** 287 * cpumask_test_cpu - test for a cpu in a cpumask 288 * @cpu: cpu number (< nr_cpu_ids) 289 * @cpumask: the cpumask pointer 290 * 291 * Returns 1 if @cpu is set in @cpumask, else returns 0 292 * 293 * No static inline type checking - see Subtlety (1) above. 294 */ 295 #define cpumask_test_cpu(cpu, cpumask) \ 296 test_bit(cpumask_check(cpu), cpumask_bits((cpumask))) 297 298 /** 299 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 300 * @cpu: cpu number (< nr_cpu_ids) 301 * @cpumask: the cpumask pointer 302 * 303 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 304 * 305 * test_and_set_bit wrapper for cpumasks. 306 */ 307 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 308 { 309 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 310 } 311 312 /** 313 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 314 * @cpu: cpu number (< nr_cpu_ids) 315 * @cpumask: the cpumask pointer 316 * 317 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 318 * 319 * test_and_clear_bit wrapper for cpumasks. 320 */ 321 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 322 { 323 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 324 } 325 326 /** 327 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 328 * @dstp: the cpumask pointer 329 */ 330 static inline void cpumask_setall(struct cpumask *dstp) 331 { 332 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 333 } 334 335 /** 336 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 337 * @dstp: the cpumask pointer 338 */ 339 static inline void cpumask_clear(struct cpumask *dstp) 340 { 341 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); 342 } 343 344 /** 345 * cpumask_and - *dstp = *src1p & *src2p 346 * @dstp: the cpumask result 347 * @src1p: the first input 348 * @src2p: the second input 349 * 350 * If *@dstp is empty, returns 0, else returns 1 351 */ 352 static inline int cpumask_and(struct cpumask *dstp, 353 const struct cpumask *src1p, 354 const struct cpumask *src2p) 355 { 356 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 357 cpumask_bits(src2p), nr_cpumask_bits); 358 } 359 360 /** 361 * cpumask_or - *dstp = *src1p | *src2p 362 * @dstp: the cpumask result 363 * @src1p: the first input 364 * @src2p: the second input 365 */ 366 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 367 const struct cpumask *src2p) 368 { 369 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 370 cpumask_bits(src2p), nr_cpumask_bits); 371 } 372 373 /** 374 * cpumask_xor - *dstp = *src1p ^ *src2p 375 * @dstp: the cpumask result 376 * @src1p: the first input 377 * @src2p: the second input 378 */ 379 static inline void cpumask_xor(struct cpumask *dstp, 380 const struct cpumask *src1p, 381 const struct cpumask *src2p) 382 { 383 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 384 cpumask_bits(src2p), nr_cpumask_bits); 385 } 386 387 /** 388 * cpumask_andnot - *dstp = *src1p & ~*src2p 389 * @dstp: the cpumask result 390 * @src1p: the first input 391 * @src2p: the second input 392 * 393 * If *@dstp is empty, returns 0, else returns 1 394 */ 395 static inline int cpumask_andnot(struct cpumask *dstp, 396 const struct cpumask *src1p, 397 const struct cpumask *src2p) 398 { 399 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 400 cpumask_bits(src2p), nr_cpumask_bits); 401 } 402 403 /** 404 * cpumask_complement - *dstp = ~*srcp 405 * @dstp: the cpumask result 406 * @srcp: the input to invert 407 */ 408 static inline void cpumask_complement(struct cpumask *dstp, 409 const struct cpumask *srcp) 410 { 411 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), 412 nr_cpumask_bits); 413 } 414 415 /** 416 * cpumask_equal - *src1p == *src2p 417 * @src1p: the first input 418 * @src2p: the second input 419 */ 420 static inline bool cpumask_equal(const struct cpumask *src1p, 421 const struct cpumask *src2p) 422 { 423 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 424 nr_cpumask_bits); 425 } 426 427 /** 428 * cpumask_intersects - (*src1p & *src2p) != 0 429 * @src1p: the first input 430 * @src2p: the second input 431 */ 432 static inline bool cpumask_intersects(const struct cpumask *src1p, 433 const struct cpumask *src2p) 434 { 435 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 436 nr_cpumask_bits); 437 } 438 439 /** 440 * cpumask_subset - (*src1p & ~*src2p) == 0 441 * @src1p: the first input 442 * @src2p: the second input 443 * 444 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0 445 */ 446 static inline int cpumask_subset(const struct cpumask *src1p, 447 const struct cpumask *src2p) 448 { 449 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 450 nr_cpumask_bits); 451 } 452 453 /** 454 * cpumask_empty - *srcp == 0 455 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 456 */ 457 static inline bool cpumask_empty(const struct cpumask *srcp) 458 { 459 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); 460 } 461 462 /** 463 * cpumask_full - *srcp == 0xFFFFFFFF... 464 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 465 */ 466 static inline bool cpumask_full(const struct cpumask *srcp) 467 { 468 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 469 } 470 471 /** 472 * cpumask_weight - Count of bits in *srcp 473 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 474 */ 475 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 476 { 477 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); 478 } 479 480 /** 481 * cpumask_shift_right - *dstp = *srcp >> n 482 * @dstp: the cpumask result 483 * @srcp: the input to shift 484 * @n: the number of bits to shift by 485 */ 486 static inline void cpumask_shift_right(struct cpumask *dstp, 487 const struct cpumask *srcp, int n) 488 { 489 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 490 nr_cpumask_bits); 491 } 492 493 /** 494 * cpumask_shift_left - *dstp = *srcp << n 495 * @dstp: the cpumask result 496 * @srcp: the input to shift 497 * @n: the number of bits to shift by 498 */ 499 static inline void cpumask_shift_left(struct cpumask *dstp, 500 const struct cpumask *srcp, int n) 501 { 502 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 503 nr_cpumask_bits); 504 } 505 506 /** 507 * cpumask_copy - *dstp = *srcp 508 * @dstp: the result 509 * @srcp: the input cpumask 510 */ 511 static inline void cpumask_copy(struct cpumask *dstp, 512 const struct cpumask *srcp) 513 { 514 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); 515 } 516 517 /** 518 * cpumask_any - pick a "random" cpu from *srcp 519 * @srcp: the input cpumask 520 * 521 * Returns >= nr_cpu_ids if no cpus set. 522 */ 523 #define cpumask_any(srcp) cpumask_first(srcp) 524 525 /** 526 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 527 * @src1p: the first input 528 * @src2p: the second input 529 * 530 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 531 */ 532 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) 533 534 /** 535 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 536 * @mask1: the first input cpumask 537 * @mask2: the second input cpumask 538 * 539 * Returns >= nr_cpu_ids if no cpus set. 540 */ 541 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 542 543 /** 544 * cpumask_of - the cpumask containing just a given cpu 545 * @cpu: the cpu (<= nr_cpu_ids) 546 */ 547 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 548 549 /** 550 * cpumask_parse_user - extract a cpumask from a user string 551 * @buf: the buffer to extract from 552 * @len: the length of the buffer 553 * @dstp: the cpumask to set. 554 * 555 * Returns -errno, or 0 for success. 556 */ 557 static inline int cpumask_parse_user(const char __user *buf, int len, 558 struct cpumask *dstp) 559 { 560 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpu_ids); 561 } 562 563 /** 564 * cpumask_parselist_user - extract a cpumask from a user string 565 * @buf: the buffer to extract from 566 * @len: the length of the buffer 567 * @dstp: the cpumask to set. 568 * 569 * Returns -errno, or 0 for success. 570 */ 571 static inline int cpumask_parselist_user(const char __user *buf, int len, 572 struct cpumask *dstp) 573 { 574 return bitmap_parselist_user(buf, len, cpumask_bits(dstp), 575 nr_cpu_ids); 576 } 577 578 /** 579 * cpumask_parse - extract a cpumask from from a string 580 * @buf: the buffer to extract from 581 * @dstp: the cpumask to set. 582 * 583 * Returns -errno, or 0 for success. 584 */ 585 static inline int cpumask_parse(const char *buf, struct cpumask *dstp) 586 { 587 char *nl = strchr(buf, '\n'); 588 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf); 589 590 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpu_ids); 591 } 592 593 /** 594 * cpulist_parse - extract a cpumask from a user string of ranges 595 * @buf: the buffer to extract from 596 * @dstp: the cpumask to set. 597 * 598 * Returns -errno, or 0 for success. 599 */ 600 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 601 { 602 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpu_ids); 603 } 604 605 /** 606 * cpumask_size - size to allocate for a 'struct cpumask' in bytes 607 * 608 * This will eventually be a runtime variable, depending on nr_cpu_ids. 609 */ 610 static inline size_t cpumask_size(void) 611 { 612 /* FIXME: Once all cpumask assignments are eliminated, this 613 * can be nr_cpumask_bits */ 614 return BITS_TO_LONGS(NR_CPUS) * sizeof(long); 615 } 616 617 /* 618 * cpumask_var_t: struct cpumask for stack usage. 619 * 620 * Oh, the wicked games we play! In order to make kernel coding a 621 * little more difficult, we typedef cpumask_var_t to an array or a 622 * pointer: doing &mask on an array is a noop, so it still works. 623 * 624 * ie. 625 * cpumask_var_t tmpmask; 626 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 627 * return -ENOMEM; 628 * 629 * ... use 'tmpmask' like a normal struct cpumask * ... 630 * 631 * free_cpumask_var(tmpmask); 632 * 633 * 634 * However, one notable exception is there. alloc_cpumask_var() allocates 635 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has 636 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t. 637 * 638 * cpumask_var_t tmpmask; 639 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 640 * return -ENOMEM; 641 * 642 * var = *tmpmask; 643 * 644 * This code makes NR_CPUS length memcopy and brings to a memory corruption. 645 * cpumask_copy() provide safe copy functionality. 646 * 647 * Note that there is another evil here: If you define a cpumask_var_t 648 * as a percpu variable then the way to obtain the address of the cpumask 649 * structure differently influences what this_cpu_* operation needs to be 650 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use 651 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the 652 * other type of cpumask_var_t implementation is configured. 653 */ 654 #ifdef CONFIG_CPUMASK_OFFSTACK 655 typedef struct cpumask *cpumask_var_t; 656 657 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) 658 659 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 660 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 661 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 662 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 663 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 664 void free_cpumask_var(cpumask_var_t mask); 665 void free_bootmem_cpumask_var(cpumask_var_t mask); 666 667 #else 668 typedef struct cpumask cpumask_var_t[1]; 669 670 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) 671 672 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 673 { 674 return true; 675 } 676 677 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 678 int node) 679 { 680 return true; 681 } 682 683 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 684 { 685 cpumask_clear(*mask); 686 return true; 687 } 688 689 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 690 int node) 691 { 692 cpumask_clear(*mask); 693 return true; 694 } 695 696 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 697 { 698 } 699 700 static inline void free_cpumask_var(cpumask_var_t mask) 701 { 702 } 703 704 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 705 { 706 } 707 #endif /* CONFIG_CPUMASK_OFFSTACK */ 708 709 /* It's common to want to use cpu_all_mask in struct member initializers, 710 * so it has to refer to an address rather than a pointer. */ 711 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 712 #define cpu_all_mask to_cpumask(cpu_all_bits) 713 714 /* First bits of cpu_bit_bitmap are in fact unset. */ 715 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 716 717 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 718 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 719 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 720 721 /* Wrappers for arch boot code to manipulate normally-constant masks */ 722 void set_cpu_possible(unsigned int cpu, bool possible); 723 void set_cpu_present(unsigned int cpu, bool present); 724 void set_cpu_online(unsigned int cpu, bool online); 725 void set_cpu_active(unsigned int cpu, bool active); 726 void init_cpu_present(const struct cpumask *src); 727 void init_cpu_possible(const struct cpumask *src); 728 void init_cpu_online(const struct cpumask *src); 729 730 /** 731 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * 732 * @bitmap: the bitmap 733 * 734 * There are a few places where cpumask_var_t isn't appropriate and 735 * static cpumasks must be used (eg. very early boot), yet we don't 736 * expose the definition of 'struct cpumask'. 737 * 738 * This does the conversion, and can be used as a constant initializer. 739 */ 740 #define to_cpumask(bitmap) \ 741 ((struct cpumask *)(1 ? (bitmap) \ 742 : (void *)sizeof(__check_is_bitmap(bitmap)))) 743 744 static inline int __check_is_bitmap(const unsigned long *bitmap) 745 { 746 return 1; 747 } 748 749 /* 750 * Special-case data structure for "single bit set only" constant CPU masks. 751 * 752 * We pre-generate all the 64 (or 32) possible bit positions, with enough 753 * padding to the left and the right, and return the constant pointer 754 * appropriately offset. 755 */ 756 extern const unsigned long 757 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 758 759 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 760 { 761 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 762 p -= cpu / BITS_PER_LONG; 763 return to_cpumask(p); 764 } 765 766 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 767 768 #if NR_CPUS <= BITS_PER_LONG 769 #define CPU_BITS_ALL \ 770 { \ 771 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 772 } 773 774 #else /* NR_CPUS > BITS_PER_LONG */ 775 776 #define CPU_BITS_ALL \ 777 { \ 778 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 779 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 780 } 781 #endif /* NR_CPUS > BITS_PER_LONG */ 782 783 /** 784 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either 785 * as comma-separated list of cpus or hex values of cpumask 786 * @list: indicates whether the cpumap must be list 787 * @mask: the cpumask to copy 788 * @buf: the buffer to copy into 789 * 790 * Returns the length of the (null-terminated) @buf string, zero if 791 * nothing is copied. 792 */ 793 static inline ssize_t 794 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) 795 { 796 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask), 797 nr_cpu_ids); 798 } 799 800 /* 801 * 802 * From here down, all obsolete. Use cpumask_ variants! 803 * 804 */ 805 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 806 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu)) 807 808 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS) 809 810 #if NR_CPUS <= BITS_PER_LONG 811 812 #define CPU_MASK_ALL \ 813 (cpumask_t) { { \ 814 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 815 } } 816 817 #else 818 819 #define CPU_MASK_ALL \ 820 (cpumask_t) { { \ 821 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 822 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 823 } } 824 825 #endif 826 827 #define CPU_MASK_NONE \ 828 (cpumask_t) { { \ 829 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 830 } } 831 832 #define CPU_MASK_CPU0 \ 833 (cpumask_t) { { \ 834 [0] = 1UL \ 835 } } 836 837 #if NR_CPUS == 1 838 #define first_cpu(src) ({ (void)(src); 0; }) 839 #define next_cpu(n, src) ({ (void)(src); 1; }) 840 #define any_online_cpu(mask) 0 841 #define for_each_cpu_mask(cpu, mask) \ 842 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 843 #else /* NR_CPUS > 1 */ 844 int __first_cpu(const cpumask_t *srcp); 845 int __next_cpu(int n, const cpumask_t *srcp); 846 847 #define first_cpu(src) __first_cpu(&(src)) 848 #define next_cpu(n, src) __next_cpu((n), &(src)) 849 #define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask) 850 #define for_each_cpu_mask(cpu, mask) \ 851 for ((cpu) = -1; \ 852 (cpu) = next_cpu((cpu), (mask)), \ 853 (cpu) < NR_CPUS; ) 854 #endif /* SMP */ 855 856 #if NR_CPUS <= 64 857 858 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask) 859 860 #else /* NR_CPUS > 64 */ 861 862 int __next_cpu_nr(int n, const cpumask_t *srcp); 863 #define for_each_cpu_mask_nr(cpu, mask) \ 864 for ((cpu) = -1; \ 865 (cpu) = __next_cpu_nr((cpu), &(mask)), \ 866 (cpu) < nr_cpu_ids; ) 867 868 #endif /* NR_CPUS > 64 */ 869 870 #define cpus_addr(src) ((src).bits) 871 872 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) 873 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) 874 { 875 set_bit(cpu, dstp->bits); 876 } 877 878 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) 879 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) 880 { 881 clear_bit(cpu, dstp->bits); 882 } 883 884 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) 885 static inline void __cpus_setall(cpumask_t *dstp, unsigned int nbits) 886 { 887 bitmap_fill(dstp->bits, nbits); 888 } 889 890 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) 891 static inline void __cpus_clear(cpumask_t *dstp, unsigned int nbits) 892 { 893 bitmap_zero(dstp->bits, nbits); 894 } 895 896 /* No static inline type checking - see Subtlety (1) above. */ 897 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits) 898 899 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) 900 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) 901 { 902 return test_and_set_bit(cpu, addr->bits); 903 } 904 905 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) 906 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p, 907 const cpumask_t *src2p, unsigned int nbits) 908 { 909 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); 910 } 911 912 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) 913 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p, 914 const cpumask_t *src2p, unsigned int nbits) 915 { 916 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); 917 } 918 919 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) 920 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p, 921 const cpumask_t *src2p, unsigned int nbits) 922 { 923 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); 924 } 925 926 #define cpus_andnot(dst, src1, src2) \ 927 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) 928 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p, 929 const cpumask_t *src2p, unsigned int nbits) 930 { 931 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); 932 } 933 934 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) 935 static inline int __cpus_equal(const cpumask_t *src1p, 936 const cpumask_t *src2p, unsigned int nbits) 937 { 938 return bitmap_equal(src1p->bits, src2p->bits, nbits); 939 } 940 941 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) 942 static inline int __cpus_intersects(const cpumask_t *src1p, 943 const cpumask_t *src2p, unsigned int nbits) 944 { 945 return bitmap_intersects(src1p->bits, src2p->bits, nbits); 946 } 947 948 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) 949 static inline int __cpus_subset(const cpumask_t *src1p, 950 const cpumask_t *src2p, unsigned int nbits) 951 { 952 return bitmap_subset(src1p->bits, src2p->bits, nbits); 953 } 954 955 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) 956 static inline int __cpus_empty(const cpumask_t *srcp, unsigned int nbits) 957 { 958 return bitmap_empty(srcp->bits, nbits); 959 } 960 961 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) 962 static inline int __cpus_weight(const cpumask_t *srcp, unsigned int nbits) 963 { 964 return bitmap_weight(srcp->bits, nbits); 965 } 966 967 #define cpus_shift_left(dst, src, n) \ 968 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) 969 static inline void __cpus_shift_left(cpumask_t *dstp, 970 const cpumask_t *srcp, int n, int nbits) 971 { 972 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); 973 } 974 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ 975 976 #endif /* __LINUX_CPUMASK_H */ 977