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