kernel/arch/s390/numa/toptree.h

   1 /*
   2  * NUMA support for s390
   3  *
   4  * A tree structure used for machine topology mangling
   5  *
   6  * Copyright IBM Corp. 2015
   7  */
   8 #ifndef S390_TOPTREE_H
   9 #define S390_TOPTREE_H
  10
  11 #include <linux/cpumask.h>
  12 #include <linux/list.h>
  13
  14 struct toptree {
  15         int level;
  16         int id;
  17         cpumask_t mask;
  18         struct toptree *parent;
  19         struct list_head sibling;
  20         struct list_head children;
  21 };
  22
  23 struct toptree *toptree_alloc(int level, int id);
  24 void toptree_free(struct toptree *cand);
  25 void toptree_update_mask(struct toptree *cand);
  26 void toptree_unify(struct toptree *cand);
  27 struct toptree *toptree_get_child(struct toptree *cand, int id);
  28 void toptree_move(struct toptree *cand, struct toptree *target);
  29 int toptree_count(struct toptree *context, int level);
  30
  31 struct toptree *toptree_first(struct toptree *context, int level);
  32 struct toptree *toptree_next(struct toptree *cur, struct toptree *context,
  33                              int level);
  34
  35 #define toptree_for_each_child(child, ptree)                            \
  36         list_for_each_entry(child,  &ptree->children, sibling)
  37
  38 #define toptree_for_each_child_safe(child, ptmp, ptree)                 \
  39         list_for_each_entry_safe(child, ptmp, &ptree->children, sibling)
  40
  41 #define toptree_is_last(ptree)                                  \
  42         ((ptree->parent == NULL) ||                             \
  43          (ptree->parent->children.prev == &ptree->sibling))
  44
  45 #define toptree_for_each(ptree, cont, ttype)            \
  46         for (ptree = toptree_first(cont, ttype);        \
  47              ptree != NULL;                             \
  48              ptree = toptree_next(ptree, cont, ttype))
  49
  50 #define toptree_for_each_safe(ptree, tmp, cont, ttype)          \
  51         for (ptree = toptree_first(cont, ttype),                \
  52                      tmp = toptree_next(ptree, cont, ttype);    \
  53              ptree != NULL;                                     \
  54              ptree = tmp,                                       \
  55                      tmp = toptree_next(ptree, cont, ttype))
  56
  57 #define toptree_for_each_sibling(ptree, start)                  \
  58         toptree_for_each(ptree, start->parent, start->level)
  59
  60 #endif /* S390_TOPTREE_H */