1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_NODEMASK_H 3 #define __LINUX_NODEMASK_H 4 5 /* 6 * Nodemasks provide a bitmap suitable for representing the 7 * set of Node's in a system, one bit position per Node number. 8 * 9 * See detailed comments in the file linux/bitmap.h describing the 10 * data type on which these nodemasks are based. 11 * 12 * For details of nodemask_parse_user(), see bitmap_parse_user() in 13 * lib/bitmap.c. For details of nodelist_parse(), see bitmap_parselist(), 14 * also in bitmap.c. For details of node_remap(), see bitmap_bitremap in 15 * lib/bitmap.c. For details of nodes_remap(), see bitmap_remap in 16 * lib/bitmap.c. For details of nodes_onto(), see bitmap_onto in 17 * lib/bitmap.c. For details of nodes_fold(), see bitmap_fold in 18 * lib/bitmap.c. 19 * 20 * The available nodemask operations are: 21 * 22 * void node_set(node, mask) turn on bit 'node' in mask 23 * void node_clear(node, mask) turn off bit 'node' in mask 24 * void nodes_setall(mask) set all bits 25 * void nodes_clear(mask) clear all bits 26 * int node_isset(node, mask) true iff bit 'node' set in mask 27 * int node_test_and_set(node, mask) test and set bit 'node' in mask 28 * 29 * void nodes_and(dst, src1, src2) dst = src1 & src2 [intersection] 30 * void nodes_or(dst, src1, src2) dst = src1 | src2 [union] 31 * void nodes_xor(dst, src1, src2) dst = src1 ^ src2 32 * void nodes_andnot(dst, src1, src2) dst = src1 & ~src2 33 * void nodes_complement(dst, src) dst = ~src 34 * 35 * int nodes_equal(mask1, mask2) Does mask1 == mask2? 36 * int nodes_intersects(mask1, mask2) Do mask1 and mask2 intersect? 37 * int nodes_subset(mask1, mask2) Is mask1 a subset of mask2? 38 * int nodes_empty(mask) Is mask empty (no bits sets)? 39 * int nodes_full(mask) Is mask full (all bits sets)? 40 * int nodes_weight(mask) Hamming weight - number of set bits 41 * 42 * void nodes_shift_right(dst, src, n) Shift right 43 * void nodes_shift_left(dst, src, n) Shift left 44 * 45 * int first_node(mask) Number lowest set bit, or MAX_NUMNODES 46 * int next_node(node, mask) Next node past 'node', or MAX_NUMNODES 47 * int next_node_in(node, mask) Next node past 'node', or wrap to first, 48 * or MAX_NUMNODES 49 * int first_unset_node(mask) First node not set in mask, or 50 * MAX_NUMNODES 51 * 52 * nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set 53 * NODE_MASK_ALL Initializer - all bits set 54 * NODE_MASK_NONE Initializer - no bits set 55 * unsigned long *nodes_addr(mask) Array of unsigned long's in mask 56 * 57 * int nodemask_parse_user(ubuf, ulen, mask) Parse ascii string as nodemask 58 * int nodelist_parse(buf, map) Parse ascii string as nodelist 59 * int node_remap(oldbit, old, new) newbit = map(old, new)(oldbit) 60 * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src) 61 * void nodes_onto(dst, orig, relmap) *dst = orig relative to relmap 62 * void nodes_fold(dst, orig, sz) dst bits = orig bits mod sz 63 * 64 * for_each_node_mask(node, mask) for-loop node over mask 65 * 66 * int num_online_nodes() Number of online Nodes 67 * int num_possible_nodes() Number of all possible Nodes 68 * 69 * int node_random(mask) Random node with set bit in mask 70 * 71 * int node_online(node) Is some node online? 72 * int node_possible(node) Is some node possible? 73 * 74 * node_set_online(node) set bit 'node' in node_online_map 75 * node_set_offline(node) clear bit 'node' in node_online_map 76 * 77 * for_each_node(node) for-loop node over node_possible_map 78 * for_each_online_node(node) for-loop node over node_online_map 79 * 80 * Subtlety: 81 * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway) 82 * to generate slightly worse code. So use a simple one-line #define 83 * for node_isset(), instead of wrapping an inline inside a macro, the 84 * way we do the other calls. 85 * 86 * NODEMASK_SCRATCH 87 * When doing above logical AND, OR, XOR, Remap operations the callers tend to 88 * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large, 89 * nodemask_t's consume too much stack space. NODEMASK_SCRATCH is a helper 90 * for such situations. See below and CPUMASK_ALLOC also. 91 */ 92 93 #include <linux/kernel.h> 94 #include <linux/threads.h> 95 #include <linux/bitmap.h> 96 #include <linux/numa.h> 97 98 typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t; 99 extern nodemask_t _unused_nodemask_arg_; 100 101 /** 102 * nodemask_pr_args - printf args to output a nodemask 103 * @maskp: nodemask to be printed 104 * 105 * Can be used to provide arguments for '%*pb[l]' when printing a nodemask. 106 */ 107 #define nodemask_pr_args(maskp) __nodemask_pr_numnodes(maskp), \ 108 __nodemask_pr_bits(maskp) 109 static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m) 110 { 111 return m ? MAX_NUMNODES : 0; 112 } 113 static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m) 114 { 115 return m ? m->bits : NULL; 116 } 117 118 /* 119 * The inline keyword gives the compiler room to decide to inline, or 120 * not inline a function as it sees best. However, as these functions 121 * are called in both __init and non-__init functions, if they are not 122 * inlined we will end up with a section mis-match error (of the type of 123 * freeable items not being freed). So we must use __always_inline here 124 * to fix the problem. If other functions in the future also end up in 125 * this situation they will also need to be annotated as __always_inline 126 */ 127 #define node_set(node, dst) __node_set((node), &(dst)) 128 static __always_inline void __node_set(int node, volatile nodemask_t *dstp) 129 { 130 set_bit(node, dstp->bits); 131 } 132 133 #define node_clear(node, dst) __node_clear((node), &(dst)) 134 static inline void __node_clear(int node, volatile nodemask_t *dstp) 135 { 136 clear_bit(node, dstp->bits); 137 } 138 139 #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES) 140 static inline void __nodes_setall(nodemask_t *dstp, unsigned int nbits) 141 { 142 bitmap_fill(dstp->bits, nbits); 143 } 144 145 #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES) 146 static inline void __nodes_clear(nodemask_t *dstp, unsigned int nbits) 147 { 148 bitmap_zero(dstp->bits, nbits); 149 } 150 151 /* No static inline type checking - see Subtlety (1) above. */ 152 #define node_isset(node, nodemask) test_bit((node), (nodemask).bits) 153 154 #define node_test_and_set(node, nodemask) \ 155 __node_test_and_set((node), &(nodemask)) 156 static inline int __node_test_and_set(int node, nodemask_t *addr) 157 { 158 return test_and_set_bit(node, addr->bits); 159 } 160 161 #define nodes_and(dst, src1, src2) \ 162 __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES) 163 static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p, 164 const nodemask_t *src2p, unsigned int nbits) 165 { 166 bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); 167 } 168 169 #define nodes_or(dst, src1, src2) \ 170 __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES) 171 static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p, 172 const nodemask_t *src2p, unsigned int nbits) 173 { 174 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); 175 } 176 177 #define nodes_xor(dst, src1, src2) \ 178 __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES) 179 static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p, 180 const nodemask_t *src2p, unsigned int nbits) 181 { 182 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); 183 } 184 185 #define nodes_andnot(dst, src1, src2) \ 186 __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES) 187 static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p, 188 const nodemask_t *src2p, unsigned int nbits) 189 { 190 bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); 191 } 192 193 #define nodes_complement(dst, src) \ 194 __nodes_complement(&(dst), &(src), MAX_NUMNODES) 195 static inline void __nodes_complement(nodemask_t *dstp, 196 const nodemask_t *srcp, unsigned int nbits) 197 { 198 bitmap_complement(dstp->bits, srcp->bits, nbits); 199 } 200 201 #define nodes_equal(src1, src2) \ 202 __nodes_equal(&(src1), &(src2), MAX_NUMNODES) 203 static inline int __nodes_equal(const nodemask_t *src1p, 204 const nodemask_t *src2p, unsigned int nbits) 205 { 206 return bitmap_equal(src1p->bits, src2p->bits, nbits); 207 } 208 209 #define nodes_intersects(src1, src2) \ 210 __nodes_intersects(&(src1), &(src2), MAX_NUMNODES) 211 static inline int __nodes_intersects(const nodemask_t *src1p, 212 const nodemask_t *src2p, unsigned int nbits) 213 { 214 return bitmap_intersects(src1p->bits, src2p->bits, nbits); 215 } 216 217 #define nodes_subset(src1, src2) \ 218 __nodes_subset(&(src1), &(src2), MAX_NUMNODES) 219 static inline int __nodes_subset(const nodemask_t *src1p, 220 const nodemask_t *src2p, unsigned int nbits) 221 { 222 return bitmap_subset(src1p->bits, src2p->bits, nbits); 223 } 224 225 #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES) 226 static inline int __nodes_empty(const nodemask_t *srcp, unsigned int nbits) 227 { 228 return bitmap_empty(srcp->bits, nbits); 229 } 230 231 #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES) 232 static inline int __nodes_full(const nodemask_t *srcp, unsigned int nbits) 233 { 234 return bitmap_full(srcp->bits, nbits); 235 } 236 237 #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES) 238 static inline int __nodes_weight(const nodemask_t *srcp, unsigned int nbits) 239 { 240 return bitmap_weight(srcp->bits, nbits); 241 } 242 243 #define nodes_shift_right(dst, src, n) \ 244 __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES) 245 static inline void __nodes_shift_right(nodemask_t *dstp, 246 const nodemask_t *srcp, int n, int nbits) 247 { 248 bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); 249 } 250 251 #define nodes_shift_left(dst, src, n) \ 252 __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES) 253 static inline void __nodes_shift_left(nodemask_t *dstp, 254 const nodemask_t *srcp, int n, int nbits) 255 { 256 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); 257 } 258 259 /* FIXME: better would be to fix all architectures to never return 260 > MAX_NUMNODES, then the silly min_ts could be dropped. */ 261 262 #define first_node(src) __first_node(&(src)) 263 static inline int __first_node(const nodemask_t *srcp) 264 { 265 return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES)); 266 } 267 268 #define next_node(n, src) __next_node((n), &(src)) 269 static inline int __next_node(int n, const nodemask_t *srcp) 270 { 271 return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1)); 272 } 273 274 /* 275 * Find the next present node in src, starting after node n, wrapping around to 276 * the first node in src if needed. Returns MAX_NUMNODES if src is empty. 277 */ 278 #define next_node_in(n, src) __next_node_in((n), &(src)) 279 int __next_node_in(int node, const nodemask_t *srcp); 280 281 static inline void init_nodemask_of_node(nodemask_t *mask, int node) 282 { 283 nodes_clear(*mask); 284 node_set(node, *mask); 285 } 286 287 #define nodemask_of_node(node) \ 288 ({ \ 289 typeof(_unused_nodemask_arg_) m; \ 290 if (sizeof(m) == sizeof(unsigned long)) { \ 291 m.bits[0] = 1UL << (node); \ 292 } else { \ 293 init_nodemask_of_node(&m, (node)); \ 294 } \ 295 m; \ 296 }) 297 298 #define first_unset_node(mask) __first_unset_node(&(mask)) 299 static inline int __first_unset_node(const nodemask_t *maskp) 300 { 301 return min_t(int,MAX_NUMNODES, 302 find_first_zero_bit(maskp->bits, MAX_NUMNODES)); 303 } 304 305 #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES) 306 307 #if MAX_NUMNODES <= BITS_PER_LONG 308 309 #define NODE_MASK_ALL \ 310 ((nodemask_t) { { \ 311 [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ 312 } }) 313 314 #else 315 316 #define NODE_MASK_ALL \ 317 ((nodemask_t) { { \ 318 [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL, \ 319 [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ 320 } }) 321 322 #endif 323 324 #define NODE_MASK_NONE \ 325 ((nodemask_t) { { \ 326 [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] = 0UL \ 327 } }) 328 329 #define nodes_addr(src) ((src).bits) 330 331 #define nodemask_parse_user(ubuf, ulen, dst) \ 332 __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES) 333 static inline int __nodemask_parse_user(const char __user *buf, int len, 334 nodemask_t *dstp, int nbits) 335 { 336 return bitmap_parse_user(buf, len, dstp->bits, nbits); 337 } 338 339 #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES) 340 static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits) 341 { 342 return bitmap_parselist(buf, dstp->bits, nbits); 343 } 344 345 #define node_remap(oldbit, old, new) \ 346 __node_remap((oldbit), &(old), &(new), MAX_NUMNODES) 347 static inline int __node_remap(int oldbit, 348 const nodemask_t *oldp, const nodemask_t *newp, int nbits) 349 { 350 return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits); 351 } 352 353 #define nodes_remap(dst, src, old, new) \ 354 __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES) 355 static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp, 356 const nodemask_t *oldp, const nodemask_t *newp, int nbits) 357 { 358 bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits); 359 } 360 361 #define nodes_onto(dst, orig, relmap) \ 362 __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES) 363 static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp, 364 const nodemask_t *relmapp, int nbits) 365 { 366 bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits); 367 } 368 369 #define nodes_fold(dst, orig, sz) \ 370 __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES) 371 static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp, 372 int sz, int nbits) 373 { 374 bitmap_fold(dstp->bits, origp->bits, sz, nbits); 375 } 376 377 #if MAX_NUMNODES > 1 378 #define for_each_node_mask(node, mask) \ 379 for ((node) = first_node(mask); \ 380 (node) < MAX_NUMNODES; \ 381 (node) = next_node((node), (mask))) 382 #else /* MAX_NUMNODES == 1 */ 383 #define for_each_node_mask(node, mask) \ 384 if (!nodes_empty(mask)) \ 385 for ((node) = 0; (node) < 1; (node)++) 386 #endif /* MAX_NUMNODES */ 387 388 /* 389 * Bitmasks that are kept for all the nodes. 390 */ 391 enum node_states { 392 N_POSSIBLE, /* The node could become online at some point */ 393 N_ONLINE, /* The node is online */ 394 N_NORMAL_MEMORY, /* The node has regular memory */ 395 #ifdef CONFIG_HIGHMEM 396 N_HIGH_MEMORY, /* The node has regular or high memory */ 397 #else 398 N_HIGH_MEMORY = N_NORMAL_MEMORY, 399 #endif 400 N_MEMORY, /* The node has memory(regular, high, movable) */ 401 N_CPU, /* The node has one or more cpus */ 402 NR_NODE_STATES 403 }; 404 405 /* 406 * The following particular system nodemasks and operations 407 * on them manage all possible and online nodes. 408 */ 409 410 extern nodemask_t node_states[NR_NODE_STATES]; 411 412 #if MAX_NUMNODES > 1 413 static inline int node_state(int node, enum node_states state) 414 { 415 return node_isset(node, node_states[state]); 416 } 417 418 static inline void node_set_state(int node, enum node_states state) 419 { 420 __node_set(node, &node_states[state]); 421 } 422 423 static inline void node_clear_state(int node, enum node_states state) 424 { 425 __node_clear(node, &node_states[state]); 426 } 427 428 static inline int num_node_state(enum node_states state) 429 { 430 return nodes_weight(node_states[state]); 431 } 432 433 #define for_each_node_state(__node, __state) \ 434 for_each_node_mask((__node), node_states[__state]) 435 436 #define first_online_node first_node(node_states[N_ONLINE]) 437 #define first_memory_node first_node(node_states[N_MEMORY]) 438 static inline int next_online_node(int nid) 439 { 440 return next_node(nid, node_states[N_ONLINE]); 441 } 442 static inline int next_memory_node(int nid) 443 { 444 return next_node(nid, node_states[N_MEMORY]); 445 } 446 447 extern unsigned int nr_node_ids; 448 extern unsigned int nr_online_nodes; 449 450 static inline void node_set_online(int nid) 451 { 452 node_set_state(nid, N_ONLINE); 453 nr_online_nodes = num_node_state(N_ONLINE); 454 } 455 456 static inline void node_set_offline(int nid) 457 { 458 node_clear_state(nid, N_ONLINE); 459 nr_online_nodes = num_node_state(N_ONLINE); 460 } 461 462 #else 463 464 static inline int node_state(int node, enum node_states state) 465 { 466 return node == 0; 467 } 468 469 static inline void node_set_state(int node, enum node_states state) 470 { 471 } 472 473 static inline void node_clear_state(int node, enum node_states state) 474 { 475 } 476 477 static inline int num_node_state(enum node_states state) 478 { 479 return 1; 480 } 481 482 #define for_each_node_state(node, __state) \ 483 for ( (node) = 0; (node) == 0; (node) = 1) 484 485 #define first_online_node 0 486 #define first_memory_node 0 487 #define next_online_node(nid) (MAX_NUMNODES) 488 #define nr_node_ids 1U 489 #define nr_online_nodes 1U 490 491 #define node_set_online(node) node_set_state((node), N_ONLINE) 492 #define node_set_offline(node) node_clear_state((node), N_ONLINE) 493 494 #endif 495 496 #if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1) 497 extern int node_random(const nodemask_t *maskp); 498 #else 499 static inline int node_random(const nodemask_t *mask) 500 { 501 return 0; 502 } 503 #endif 504 505 #define node_online_map node_states[N_ONLINE] 506 #define node_possible_map node_states[N_POSSIBLE] 507 508 #define num_online_nodes() num_node_state(N_ONLINE) 509 #define num_possible_nodes() num_node_state(N_POSSIBLE) 510 #define node_online(node) node_state((node), N_ONLINE) 511 #define node_possible(node) node_state((node), N_POSSIBLE) 512 513 #define for_each_node(node) for_each_node_state(node, N_POSSIBLE) 514 #define for_each_online_node(node) for_each_node_state(node, N_ONLINE) 515 516 /* 517 * For nodemask scrach area. 518 * NODEMASK_ALLOC(type, name) allocates an object with a specified type and 519 * name. 520 */ 521 #if NODES_SHIFT > 8 /* nodemask_t > 32 bytes */ 522 #define NODEMASK_ALLOC(type, name, gfp_flags) \ 523 type *name = kmalloc(sizeof(*name), gfp_flags) 524 #define NODEMASK_FREE(m) kfree(m) 525 #else 526 #define NODEMASK_ALLOC(type, name, gfp_flags) type _##name, *name = &_##name 527 #define NODEMASK_FREE(m) do {} while (0) 528 #endif 529 530 /* A example struture for using NODEMASK_ALLOC, used in mempolicy. */ 531 struct nodemask_scratch { 532 nodemask_t mask1; 533 nodemask_t mask2; 534 }; 535 536 #define NODEMASK_SCRATCH(x) \ 537 NODEMASK_ALLOC(struct nodemask_scratch, x, \ 538 GFP_KERNEL | __GFP_NORETRY) 539 #define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x) 540 541 542 #endif /* __LINUX_NODEMASK_H */ 543