include/linux/nodemask.h

   1 #ifndef __LINUX_NODEMASK_H
   2 #define __LINUX_NODEMASK_H
   3
   4 /*
   5  * Nodemasks provide a bitmap suitable for representing the
   6  * set of Node's in a system, one bit position per Node number.
   7  *
   8  * See detailed comments in the file linux/bitmap.h describing the
   9  * data type on which these nodemasks are based.
  10  *
  11  * For details of nodemask_scnprintf() and nodemask_parse_user(),
  12  * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.
  13  * For details of nodelist_scnprintf() and nodelist_parse(), see
  14  * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
  15  * For details of node_remap(), see bitmap_bitremap in lib/bitmap.c.
  16  * For details of nodes_remap(), see bitmap_remap in lib/bitmap.c.
  17  * For details of nodes_onto(), see bitmap_onto in lib/bitmap.c.
  18  * For details of nodes_fold(), see bitmap_fold in 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 first_unset_node(mask)           First node not set in mask, or
  48  *                                      MAX_NUMNODES.
  49  *
  50  * nodemask_t nodemask_of_node(node)    Return nodemask with bit 'node' set
  51  * NODE_MASK_ALL                        Initializer - all bits set
  52  * NODE_MASK_NONE                       Initializer - no bits set
  53  * unsigned long *nodes_addr(mask)      Array of unsigned long's in mask
  54  *
  55  * int nodemask_scnprintf(buf, len, mask) Format nodemask for printing
  56  * int nodemask_parse_user(ubuf, ulen, mask)    Parse ascii string as nodemask
  57  * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
  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_online(node)                Is some node online?
  70  * int node_possible(node)              Is some node possible?
  71  *
  72  * int any_online_node(mask)            First online node in mask
  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
  87 #include <linux/kernel.h>
  88 #include <linux/threads.h>
  89 #include <linux/bitmap.h>
  90 #include <linux/numa.h>
  91
  92 typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
  93 extern nodemask_t _unused_nodemask_arg_;
  94
  95 #define node_set(node, dst) __node_set((node), &(dst))
  96 static inline void __node_set(int node, volatile nodemask_t *dstp)
  97 {
  98         set_bit(node, dstp->bits);
  99 }
 100
 101 #define node_clear(node, dst) __node_clear((node), &(dst))
 102 static inline void __node_clear(int node, volatile nodemask_t *dstp)
 103 {
 104         clear_bit(node, dstp->bits);
 105 }
 106
 107 #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
 108 static inline void __nodes_setall(nodemask_t *dstp, int nbits)
 109 {
 110         bitmap_fill(dstp->bits, nbits);
 111 }
 112
 113 #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
 114 static inline void __nodes_clear(nodemask_t *dstp, int nbits)
 115 {
 116         bitmap_zero(dstp->bits, nbits);
 117 }
 118
 119 /* No static inline type checking - see Subtlety (1) above. */
 120 #define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
 121
 122 #define node_test_and_set(node, nodemask) \
 123                         __node_test_and_set((node), &(nodemask))
 124 static inline int __node_test_and_set(int node, nodemask_t *addr)
 125 {
 126         return test_and_set_bit(node, addr->bits);
 127 }
 128
 129 #define nodes_and(dst, src1, src2) \
 130                         __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
 131 static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
 132                                         const nodemask_t *src2p, int nbits)
 133 {
 134         bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
 135 }
 136
 137 #define nodes_or(dst, src1, src2) \
 138                         __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
 139 static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
 140                                         const nodemask_t *src2p, int nbits)
 141 {
 142         bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
 143 }
 144
 145 #define nodes_xor(dst, src1, src2) \
 146                         __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
 147 static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
 148                                         const nodemask_t *src2p, int nbits)
 149 {
 150         bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
 151 }
 152
 153 #define nodes_andnot(dst, src1, src2) \
 154                         __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
 155 static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
 156                                         const nodemask_t *src2p, int nbits)
 157 {
 158         bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
 159 }
 160
 161 #define nodes_complement(dst, src) \
 162                         __nodes_complement(&(dst), &(src), MAX_NUMNODES)
 163 static inline void __nodes_complement(nodemask_t *dstp,
 164                                         const nodemask_t *srcp, int nbits)
 165 {
 166         bitmap_complement(dstp->bits, srcp->bits, nbits);
 167 }
 168
 169 #define nodes_equal(src1, src2) \
 170                         __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
 171 static inline int __nodes_equal(const nodemask_t *src1p,
 172                                         const nodemask_t *src2p, int nbits)
 173 {
 174         return bitmap_equal(src1p->bits, src2p->bits, nbits);
 175 }
 176
 177 #define nodes_intersects(src1, src2) \
 178                         __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
 179 static inline int __nodes_intersects(const nodemask_t *src1p,
 180                                         const nodemask_t *src2p, int nbits)
 181 {
 182         return bitmap_intersects(src1p->bits, src2p->bits, nbits);
 183 }
 184
 185 #define nodes_subset(src1, src2) \
 186                         __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
 187 static inline int __nodes_subset(const nodemask_t *src1p,
 188                                         const nodemask_t *src2p, int nbits)
 189 {
 190         return bitmap_subset(src1p->bits, src2p->bits, nbits);
 191 }
 192
 193 #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
 194 static inline int __nodes_empty(const nodemask_t *srcp, int nbits)
 195 {
 196         return bitmap_empty(srcp->bits, nbits);
 197 }
 198
 199 #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
 200 static inline int __nodes_full(const nodemask_t *srcp, int nbits)
 201 {
 202         return bitmap_full(srcp->bits, nbits);
 203 }
 204
 205 #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
 206 static inline int __nodes_weight(const nodemask_t *srcp, int nbits)
 207 {
 208         return bitmap_weight(srcp->bits, nbits);
 209 }
 210
 211 #define nodes_shift_right(dst, src, n) \
 212                         __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
 213 static inline void __nodes_shift_right(nodemask_t *dstp,
 214                                         const nodemask_t *srcp, int n, int nbits)
 215 {
 216         bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
 217 }
 218
 219 #define nodes_shift_left(dst, src, n) \
 220                         __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
 221 static inline void __nodes_shift_left(nodemask_t *dstp,
 222                                         const nodemask_t *srcp, int n, int nbits)
 223 {
 224         bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
 225 }
 226
 227 /* FIXME: better would be to fix all architectures to never return
 228           > MAX_NUMNODES, then the silly min_ts could be dropped. */
 229
 230 #define first_node(src) __first_node(&(src))
 231 static inline int __first_node(const nodemask_t *srcp)
 232 {
 233         return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
 234 }
 235
 236 #define next_node(n, src) __next_node((n), &(src))
 237 static inline int __next_node(int n, const nodemask_t *srcp)
 238 {
 239         return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
 240 }
 241
 242 #define nodemask_of_node(node)                                          \
 243 ({                                                                      \
 244         typeof(_unused_nodemask_arg_) m;                                \
 245         if (sizeof(m) == sizeof(unsigned long)) {                       \
 246                 m.bits[0] = 1UL<<(node);                                \
 247         } else {                                                        \
 248                 nodes_clear(m);                                         \
 249                 node_set((node), m);                                    \
 250         }                                                               \
 251         m;                                                              \
 252 })
 253
 254 #define first_unset_node(mask) __first_unset_node(&(mask))
 255 static inline int __first_unset_node(const nodemask_t *maskp)
 256 {
 257         return min_t(int,MAX_NUMNODES,
 258                         find_first_zero_bit(maskp->bits, MAX_NUMNODES));
 259 }
 260
 261 #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
 262
 263 #if MAX_NUMNODES <= BITS_PER_LONG
 264
 265 #define NODE_MASK_ALL                                                   \
 266 ((nodemask_t) { {                                                       \
 267         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
 268 } })
 269
 270 #else
 271
 272 #define NODE_MASK_ALL                                                   \
 273 ((nodemask_t) { {                                                       \
 274         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL,                   \
 275         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
 276 } })
 277
 278 #endif
 279
 280 #define NODE_MASK_NONE                                                  \
 281 ((nodemask_t) { {                                                       \
 282         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] =  0UL                    \
 283 } })
 284
 285 #define nodes_addr(src) ((src).bits)
 286
 287 #define nodemask_scnprintf(buf, len, src) \
 288                         __nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES)
 289 static inline int __nodemask_scnprintf(char *buf, int len,
 290                                         const nodemask_t *srcp, int nbits)
 291 {
 292         return bitmap_scnprintf(buf, len, srcp->bits, nbits);
 293 }
 294
 295 #define nodemask_parse_user(ubuf, ulen, dst) \
 296                 __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
 297 static inline int __nodemask_parse_user(const char __user *buf, int len,
 298                                         nodemask_t *dstp, int nbits)
 299 {
 300         return bitmap_parse_user(buf, len, dstp->bits, nbits);
 301 }
 302
 303 #define nodelist_scnprintf(buf, len, src) \
 304                         __nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES)
 305 static inline int __nodelist_scnprintf(char *buf, int len,
 306                                         const nodemask_t *srcp, int nbits)
 307 {
 308         return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
 309 }
 310
 311 #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
 312 static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
 313 {
 314         return bitmap_parselist(buf, dstp->bits, nbits);
 315 }
 316
 317 #define node_remap(oldbit, old, new) \
 318                 __node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
 319 static inline int __node_remap(int oldbit,
 320                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
 321 {
 322         return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
 323 }
 324
 325 #define nodes_remap(dst, src, old, new) \
 326                 __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
 327 static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
 328                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
 329 {
 330         bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
 331 }
 332
 333 #define nodes_onto(dst, orig, relmap) \
 334                 __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
 335 static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp,
 336                 const nodemask_t *relmapp, int nbits)
 337 {
 338         bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
 339 }
 340
 341 #define nodes_fold(dst, orig, sz) \
 342                 __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
 343 static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
 344                 int sz, int nbits)
 345 {
 346         bitmap_fold(dstp->bits, origp->bits, sz, nbits);
 347 }
 348
 349 #if MAX_NUMNODES > 1
 350 #define for_each_node_mask(node, mask)                  \
 351         for ((node) = first_node(mask);                 \
 352                 (node) < MAX_NUMNODES;                  \
 353                 (node) = next_node((node), (mask)))
 354 #else /* MAX_NUMNODES == 1 */
 355 #define for_each_node_mask(node, mask)                  \
 356         if (!nodes_empty(mask))                         \
 357                 for ((node) = 0; (node) < 1; (node)++)
 358 #endif /* MAX_NUMNODES */
 359
 360 /*
 361  * Bitmasks that are kept for all the nodes.
 362  */
 363 enum node_states {
 364         N_POSSIBLE,             /* The node could become online at some point */
 365         N_ONLINE,               /* The node is online */
 366         N_NORMAL_MEMORY,        /* The node has regular memory */
 367 #ifdef CONFIG_HIGHMEM
 368         N_HIGH_MEMORY,          /* The node has regular or high memory */
 369 #else
 370         N_HIGH_MEMORY = N_NORMAL_MEMORY,
 371 #endif
 372         N_CPU,          /* The node has one or more cpus */
 373         NR_NODE_STATES
 374 };
 375
 376 /*
 377  * The following particular system nodemasks and operations
 378  * on them manage all possible and online nodes.
 379  */
 380
 381 extern nodemask_t node_states[NR_NODE_STATES];
 382
 383 #if MAX_NUMNODES > 1
 384 static inline int node_state(int node, enum node_states state)
 385 {
 386         return node_isset(node, node_states[state]);
 387 }
 388
 389 static inline void node_set_state(int node, enum node_states state)
 390 {
 391         __node_set(node, &node_states[state]);
 392 }
 393
 394 static inline void node_clear_state(int node, enum node_states state)
 395 {
 396         __node_clear(node, &node_states[state]);
 397 }
 398
 399 static inline int num_node_state(enum node_states state)
 400 {
 401         return nodes_weight(node_states[state]);
 402 }
 403
 404 #define for_each_node_state(__node, __state) \
 405         for_each_node_mask((__node), node_states[__state])
 406
 407 #define first_online_node       first_node(node_states[N_ONLINE])
 408 #define next_online_node(nid)   next_node((nid), node_states[N_ONLINE])
 409
 410 extern int nr_node_ids;
 411 extern int nr_online_nodes;
 412
 413 static inline void node_set_online(int nid)
 414 {
 415         node_set_state(nid, N_ONLINE);
 416         nr_online_nodes = num_node_state(N_ONLINE);
 417 }
 418
 419 static inline void node_set_offline(int nid)
 420 {
 421         node_clear_state(nid, N_ONLINE);
 422         nr_online_nodes = num_node_state(N_ONLINE);
 423 }
 424 #else
 425
 426 static inline int node_state(int node, enum node_states state)
 427 {
 428         return node == 0;
 429 }
 430
 431 static inline void node_set_state(int node, enum node_states state)
 432 {
 433 }
 434
 435 static inline void node_clear_state(int node, enum node_states state)
 436 {
 437 }
 438
 439 static inline int num_node_state(enum node_states state)
 440 {
 441         return 1;
 442 }
 443
 444 #define for_each_node_state(node, __state) \
 445         for ( (node) = 0; (node) == 0; (node) = 1)
 446
 447 #define first_online_node       0
 448 #define next_online_node(nid)   (MAX_NUMNODES)
 449 #define nr_node_ids             1
 450 #define nr_online_nodes         1
 451
 452 #define node_set_online(node)      node_set_state((node), N_ONLINE)
 453 #define node_set_offline(node)     node_clear_state((node), N_ONLINE)
 454 #endif
 455
 456 #define node_online_map         node_states[N_ONLINE]
 457 #define node_possible_map       node_states[N_POSSIBLE]
 458
 459 #define any_online_node(mask)                   \
 460 ({                                              \
 461         int node;                               \
 462         for_each_node_mask(node, (mask))        \
 463                 if (node_online(node))          \
 464                         break;                  \
 465         node;                                   \
 466 })
 467
 468 #define num_online_nodes()      num_node_state(N_ONLINE)
 469 #define num_possible_nodes()    num_node_state(N_POSSIBLE)
 470 #define node_online(node)       node_state((node), N_ONLINE)
 471 #define node_possible(node)     node_state((node), N_POSSIBLE)
 472
 473 #define for_each_node(node)        for_each_node_state(node, N_POSSIBLE)
 474 #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
 475
 476 #endif /* __LINUX_NODEMASK_H */