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  *
  18  * The available nodemask operations are:
  19  *
  20  * void node_set(node, mask)            turn on bit 'node' in mask
  21  * void node_clear(node, mask)          turn off bit 'node' in mask
  22  * void nodes_setall(mask)              set all bits
  23  * void nodes_clear(mask)               clear all bits
  24  * int node_isset(node, mask)           true iff bit 'node' set in mask
  25  * int node_test_and_set(node, mask)    test and set bit 'node' in mask
  26  *
  27  * void nodes_and(dst, src1, src2)      dst = src1 & src2  [intersection]
  28  * void nodes_or(dst, src1, src2)       dst = src1 | src2  [union]
  29  * void nodes_xor(dst, src1, src2)      dst = src1 ^ src2
  30  * void nodes_andnot(dst, src1, src2)   dst = src1 & ~src2
  31  * void nodes_complement(dst, src)      dst = ~src
  32  *
  33  * int nodes_equal(mask1, mask2)        Does mask1 == mask2?
  34  * int nodes_intersects(mask1, mask2)   Do mask1 and mask2 intersect?
  35  * int nodes_subset(mask1, mask2)       Is mask1 a subset of mask2?
  36  * int nodes_empty(mask)                Is mask empty (no bits sets)?
  37  * int nodes_full(mask)                 Is mask full (all bits sets)?
  38  * int nodes_weight(mask)               Hamming weight - number of set bits
  39  *
  40  * void nodes_shift_right(dst, src, n)  Shift right
  41  * void nodes_shift_left(dst, src, n)   Shift left
  42  *
  43  * int first_node(mask)                 Number lowest set bit, or MAX_NUMNODES
  44  * int next_node(node, mask)            Next node past 'node', or MAX_NUMNODES
  45  * int first_unset_node(mask)           First node not set in mask, or
  46  *                                      MAX_NUMNODES.
  47  *
  48  * nodemask_t nodemask_of_node(node)    Return nodemask with bit 'node' set
  49  * NODE_MASK_ALL                        Initializer - all bits set
  50  * NODE_MASK_NONE                       Initializer - no bits set
  51  * unsigned long *nodes_addr(mask)      Array of unsigned long's in mask
  52  *
  53  * int nodemask_scnprintf(buf, len, mask) Format nodemask for printing
  54  * int nodemask_parse_user(ubuf, ulen, mask)    Parse ascii string as nodemask
  55  * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
  56  * int nodelist_parse(buf, map)         Parse ascii string as nodelist
  57  * int node_remap(oldbit, old, new)     newbit = map(old, new)(oldbit)
  58  * int nodes_remap(dst, src, old, new)  *dst = map(old, new)(dst)
  59  *
  60  * for_each_node_mask(node, mask)       for-loop node over mask
  61  *
  62  * int num_online_nodes()               Number of online Nodes
  63  * int num_possible_nodes()             Number of all possible Nodes
  64  *
  65  * int node_online(node)                Is some node online?
  66  * int node_possible(node)              Is some node possible?
  67  *
  68  * int any_online_node(mask)            First online node in mask
  69  *
  70  * node_set_online(node)                set bit 'node' in node_online_map
  71  * node_set_offline(node)               clear bit 'node' in node_online_map
  72  *
  73  * for_each_node(node)                  for-loop node over node_possible_map
  74  * for_each_online_node(node)           for-loop node over node_online_map
  75  *
  76  * Subtlety:
  77  * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
  78  *    to generate slightly worse code.  So use a simple one-line #define
  79  *    for node_isset(), instead of wrapping an inline inside a macro, the
  80  *    way we do the other calls.
  81  */
  82
  83 #include <linux/kernel.h>
  84 #include <linux/threads.h>
  85 #include <linux/bitmap.h>
  86 #include <linux/numa.h>
  87
  88 typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
  89 extern nodemask_t _unused_nodemask_arg_;
  90
  91 #define node_set(node, dst) __node_set((node), &(dst))
  92 static inline void __node_set(int node, volatile nodemask_t *dstp)
  93 {
  94         set_bit(node, dstp->bits);
  95 }
  96
  97 #define node_clear(node, dst) __node_clear((node), &(dst))
  98 static inline void __node_clear(int node, volatile nodemask_t *dstp)
  99 {
 100         clear_bit(node, dstp->bits);
 101 }
 102
 103 #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
 104 static inline void __nodes_setall(nodemask_t *dstp, int nbits)
 105 {
 106         bitmap_fill(dstp->bits, nbits);
 107 }
 108
 109 #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
 110 static inline void __nodes_clear(nodemask_t *dstp, int nbits)
 111 {
 112         bitmap_zero(dstp->bits, nbits);
 113 }
 114
 115 /* No static inline type checking - see Subtlety (1) above. */
 116 #define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
 117
 118 #define node_test_and_set(node, nodemask) \
 119                         __node_test_and_set((node), &(nodemask))
 120 static inline int __node_test_and_set(int node, nodemask_t *addr)
 121 {
 122         return test_and_set_bit(node, addr->bits);
 123 }
 124
 125 #define nodes_and(dst, src1, src2) \
 126                         __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
 127 static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
 128                                         const nodemask_t *src2p, int nbits)
 129 {
 130         bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
 131 }
 132
 133 #define nodes_or(dst, src1, src2) \
 134                         __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
 135 static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
 136                                         const nodemask_t *src2p, int nbits)
 137 {
 138         bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
 139 }
 140
 141 #define nodes_xor(dst, src1, src2) \
 142                         __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
 143 static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
 144                                         const nodemask_t *src2p, int nbits)
 145 {
 146         bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
 147 }
 148
 149 #define nodes_andnot(dst, src1, src2) \
 150                         __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
 151 static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
 152                                         const nodemask_t *src2p, int nbits)
 153 {
 154         bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
 155 }
 156
 157 #define nodes_complement(dst, src) \
 158                         __nodes_complement(&(dst), &(src), MAX_NUMNODES)
 159 static inline void __nodes_complement(nodemask_t *dstp,
 160                                         const nodemask_t *srcp, int nbits)
 161 {
 162         bitmap_complement(dstp->bits, srcp->bits, nbits);
 163 }
 164
 165 #define nodes_equal(src1, src2) \
 166                         __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
 167 static inline int __nodes_equal(const nodemask_t *src1p,
 168                                         const nodemask_t *src2p, int nbits)
 169 {
 170         return bitmap_equal(src1p->bits, src2p->bits, nbits);
 171 }
 172
 173 #define nodes_intersects(src1, src2) \
 174                         __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
 175 static inline int __nodes_intersects(const nodemask_t *src1p,
 176                                         const nodemask_t *src2p, int nbits)
 177 {
 178         return bitmap_intersects(src1p->bits, src2p->bits, nbits);
 179 }
 180
 181 #define nodes_subset(src1, src2) \
 182                         __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
 183 static inline int __nodes_subset(const nodemask_t *src1p,
 184                                         const nodemask_t *src2p, int nbits)
 185 {
 186         return bitmap_subset(src1p->bits, src2p->bits, nbits);
 187 }
 188
 189 #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
 190 static inline int __nodes_empty(const nodemask_t *srcp, int nbits)
 191 {
 192         return bitmap_empty(srcp->bits, nbits);
 193 }
 194
 195 #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
 196 static inline int __nodes_full(const nodemask_t *srcp, int nbits)
 197 {
 198         return bitmap_full(srcp->bits, nbits);
 199 }
 200
 201 #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
 202 static inline int __nodes_weight(const nodemask_t *srcp, int nbits)
 203 {
 204         return bitmap_weight(srcp->bits, nbits);
 205 }
 206
 207 #define nodes_shift_right(dst, src, n) \
 208                         __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
 209 static inline void __nodes_shift_right(nodemask_t *dstp,
 210                                         const nodemask_t *srcp, int n, int nbits)
 211 {
 212         bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
 213 }
 214
 215 #define nodes_shift_left(dst, src, n) \
 216                         __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
 217 static inline void __nodes_shift_left(nodemask_t *dstp,
 218                                         const nodemask_t *srcp, int n, int nbits)
 219 {
 220         bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
 221 }
 222
 223 /* FIXME: better would be to fix all architectures to never return
 224           > MAX_NUMNODES, then the silly min_ts could be dropped. */
 225
 226 #define first_node(src) __first_node(&(src))
 227 static inline int __first_node(const nodemask_t *srcp)
 228 {
 229         return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
 230 }
 231
 232 #define next_node(n, src) __next_node((n), &(src))
 233 static inline int __next_node(int n, const nodemask_t *srcp)
 234 {
 235         return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
 236 }
 237
 238 #define nodemask_of_node(node)                                          \
 239 ({                                                                      \
 240         typeof(_unused_nodemask_arg_) m;                                \
 241         if (sizeof(m) == sizeof(unsigned long)) {                       \
 242                 m.bits[0] = 1UL<<(node);                                \
 243         } else {                                                        \
 244                 nodes_clear(m);                                         \
 245                 node_set((node), m);                                    \
 246         }                                                               \
 247         m;                                                              \
 248 })
 249
 250 #define first_unset_node(mask) __first_unset_node(&(mask))
 251 static inline int __first_unset_node(const nodemask_t *maskp)
 252 {
 253         return min_t(int,MAX_NUMNODES,
 254                         find_first_zero_bit(maskp->bits, MAX_NUMNODES));
 255 }
 256
 257 #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
 258
 259 #if MAX_NUMNODES <= BITS_PER_LONG
 260
 261 #define NODE_MASK_ALL                                                   \
 262 ((nodemask_t) { {                                                       \
 263         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
 264 } })
 265
 266 #else
 267
 268 #define NODE_MASK_ALL                                                   \
 269 ((nodemask_t) { {                                                       \
 270         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL,                   \
 271         [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
 272 } })
 273
 274 #endif
 275
 276 #define NODE_MASK_NONE                                                  \
 277 ((nodemask_t) { {                                                       \
 278         [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] =  0UL                    \
 279 } })
 280
 281 #define nodes_addr(src) ((src).bits)
 282
 283 #define nodemask_scnprintf(buf, len, src) \
 284                         __nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES)
 285 static inline int __nodemask_scnprintf(char *buf, int len,
 286                                         const nodemask_t *srcp, int nbits)
 287 {
 288         return bitmap_scnprintf(buf, len, srcp->bits, nbits);
 289 }
 290
 291 #define nodemask_parse_user(ubuf, ulen, dst) \
 292                 __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
 293 static inline int __nodemask_parse_user(const char __user *buf, int len,
 294                                         nodemask_t *dstp, int nbits)
 295 {
 296         return bitmap_parse_user(buf, len, dstp->bits, nbits);
 297 }
 298
 299 #define nodelist_scnprintf(buf, len, src) \
 300                         __nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES)
 301 static inline int __nodelist_scnprintf(char *buf, int len,
 302                                         const nodemask_t *srcp, int nbits)
 303 {
 304         return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
 305 }
 306
 307 #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
 308 static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
 309 {
 310         return bitmap_parselist(buf, dstp->bits, nbits);
 311 }
 312
 313 #define node_remap(oldbit, old, new) \
 314                 __node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
 315 static inline int __node_remap(int oldbit,
 316                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
 317 {
 318         return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
 319 }
 320
 321 #define nodes_remap(dst, src, old, new) \
 322                 __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
 323 static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
 324                 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
 325 {
 326         bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
 327 }
 328
 329 #if MAX_NUMNODES > 1
 330 #define for_each_node_mask(node, mask)                  \
 331         for ((node) = first_node(mask);                 \
 332                 (node) < MAX_NUMNODES;                  \
 333                 (node) = next_node((node), (mask)))
 334 #else /* MAX_NUMNODES == 1 */
 335 #define for_each_node_mask(node, mask)                  \
 336         if (!nodes_empty(mask))                         \
 337                 for ((node) = 0; (node) < 1; (node)++)
 338 #endif /* MAX_NUMNODES */
 339
 340 /*
 341  * Bitmasks that are kept for all the nodes.
 342  */
 343 enum node_states {
 344         N_POSSIBLE,             /* The node could become online at some point */
 345         N_ONLINE,               /* The node is online */
 346         N_NORMAL_MEMORY,        /* The node has regular memory */
 347 #ifdef CONFIG_HIGHMEM
 348         N_HIGH_MEMORY,          /* The node has regular or high memory */
 349 #else
 350         N_HIGH_MEMORY = N_NORMAL_MEMORY,
 351 #endif
 352         N_CPU,          /* The node has one or more cpus */
 353         NR_NODE_STATES
 354 };
 355
 356 /*
 357  * The following particular system nodemasks and operations
 358  * on them manage all possible and online nodes.
 359  */
 360
 361 extern nodemask_t node_states[NR_NODE_STATES];
 362
 363 #if MAX_NUMNODES > 1
 364 static inline int node_state(int node, enum node_states state)
 365 {
 366         return node_isset(node, node_states[state]);
 367 }
 368
 369 static inline void node_set_state(int node, enum node_states state)
 370 {
 371         __node_set(node, &node_states[state]);
 372 }
 373
 374 static inline void node_clear_state(int node, enum node_states state)
 375 {
 376         __node_clear(node, &node_states[state]);
 377 }
 378
 379 static inline int num_node_state(enum node_states state)
 380 {
 381         return nodes_weight(node_states[state]);
 382 }
 383
 384 #define for_each_node_state(__node, __state) \
 385         for_each_node_mask((__node), node_states[__state])
 386
 387 #define first_online_node       first_node(node_states[N_ONLINE])
 388 #define next_online_node(nid)   next_node((nid), node_states[N_ONLINE])
 389
 390 extern int nr_node_ids;
 391 #else
 392
 393 static inline int node_state(int node, enum node_states state)
 394 {
 395         return node == 0;
 396 }
 397
 398 static inline void node_set_state(int node, enum node_states state)
 399 {
 400 }
 401
 402 static inline void node_clear_state(int node, enum node_states state)
 403 {
 404 }
 405
 406 static inline int num_node_state(enum node_states state)
 407 {
 408         return 1;
 409 }
 410
 411 #define for_each_node_state(node, __state) \
 412         for ( (node) = 0; (node) == 0; (node) = 1)
 413
 414 #define first_online_node       0
 415 #define next_online_node(nid)   (MAX_NUMNODES)
 416 #define nr_node_ids             1
 417
 418 #endif
 419
 420 #define node_online_map         node_states[N_ONLINE]
 421 #define node_possible_map       node_states[N_POSSIBLE]
 422
 423 #define any_online_node(mask)                   \
 424 ({                                              \
 425         int node;                               \
 426         for_each_node_mask(node, (mask))        \
 427                 if (node_online(node))          \
 428                         break;                  \
 429         node;                                   \
 430 })
 431
 432 #define num_online_nodes()      num_node_state(N_ONLINE)
 433 #define num_possible_nodes()    num_node_state(N_POSSIBLE)
 434 #define node_online(node)       node_state((node), N_ONLINE)
 435 #define node_possible(node)     node_state((node), N_POSSIBLE)
 436
 437 #define node_set_online(node)      node_set_state((node), N_ONLINE)
 438 #define node_set_offline(node)     node_clear_state((node), N_ONLINE)
 439
 440 #define for_each_node(node)        for_each_node_state(node, N_POSSIBLE)
 441 #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
 442
 443 #endif /* __LINUX_NODEMASK_H */