cpuset.h

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    1 /*-
    2  * Copyright (c) 2008,  Jeffrey Roberson <jeff@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Copyright (c) 2008 Nokia Corporation
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/9.1/sys/sys/cpuset.h 233598 2012-03-28 10:15:42Z mav $
   30  */
   31 
   32 #ifndef _SYS_CPUSET_H_
   33 #define _SYS_CPUSET_H_
   34 
   35 #include <sys/_cpuset.h>
   36 
   37 #define CPUSETBUFSIZ    ((2 + sizeof(long) * 2) * _NCPUWORDS)
   38 
   39 /*
   40  * Macros addressing word and bit within it, tuned to make compiler
   41  * optimize cases when CPU_SETSIZE fits into single machine word.
   42  */
   43 #define __cpuset_mask(n)                                \
   44         ((long)1 << ((_NCPUWORDS == 1) ? (__size_t)(n) : ((n) % _NCPUBITS)))
   45 #define __cpuset_word(n)        ((_NCPUWORDS == 1) ? 0 : ((n) / _NCPUBITS))
   46 
   47 #define CPU_CLR(n, p)   ((p)->__bits[__cpuset_word(n)] &= ~__cpuset_mask(n))
   48 #define CPU_COPY(f, t)  (void)(*(t) = *(f))
   49 #define CPU_ISSET(n, p) (((p)->__bits[__cpuset_word(n)] & __cpuset_mask(n)) != 0)
   50 #define CPU_SET(n, p)   ((p)->__bits[__cpuset_word(n)] |= __cpuset_mask(n))
   51 #define CPU_ZERO(p) do {                                \
   52         __size_t __i;                                   \
   53         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   54                 (p)->__bits[__i] = 0;                   \
   55 } while (0)
   56 
   57 #define CPU_FILL(p) do {                                \
   58         __size_t __i;                                   \
   59         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   60                 (p)->__bits[__i] = -1;                  \
   61 } while (0)
   62 
   63 #define CPU_SETOF(n, p) do {                                    \
   64         CPU_ZERO(p);                                            \
   65         ((p)->__bits[__cpuset_word(n)] = __cpuset_mask(n));     \
   66 } while (0)
   67 
   68 /* Is p empty. */
   69 #define CPU_EMPTY(p) __extension__ ({                   \
   70         __size_t __i;                                   \
   71         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   72                 if ((p)->__bits[__i])                   \
   73                         break;                          \
   74         __i == _NCPUWORDS;                              \
   75 })
   76 
   77 /* Is p full set. */
   78 #define CPU_ISFULLSET(p) __extension__ ({               \
   79         __size_t __i;                                   \
   80         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   81                 if ((p)->__bits[__i] != (long)-1)       \
   82                         break;                          \
   83         __i == _NCPUWORDS;                              \
   84 })
   85 
   86 /* Is c a subset of p. */
   87 #define CPU_SUBSET(p, c) __extension__ ({               \
   88         __size_t __i;                                   \
   89         for (__i = 0; __i < _NCPUWORDS; __i++)          \
   90                 if (((c)->__bits[__i] &                 \
   91                     (p)->__bits[__i]) !=                \
   92                     (c)->__bits[__i])                   \
   93                         break;                          \
   94         __i == _NCPUWORDS;                              \
   95 })
   96 
   97 /* Are there any common bits between b & c? */
   98 #define CPU_OVERLAP(p, c) __extension__ ({              \
   99         __size_t __i;                                   \
  100         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  101                 if (((c)->__bits[__i] &                 \
  102                     (p)->__bits[__i]) != 0)             \
  103                         break;                          \
  104         __i != _NCPUWORDS;                              \
  105 })
  106 
  107 /* Compare two sets, returns 0 if equal 1 otherwise. */
  108 #define CPU_CMP(p, c) __extension__ ({                  \
  109         __size_t __i;                                   \
  110         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  111                 if (((c)->__bits[__i] !=                \
  112                     (p)->__bits[__i]))                  \
  113                         break;                          \
  114         __i != _NCPUWORDS;                              \
  115 })
  116 
  117 #define CPU_OR(d, s) do {                               \
  118         __size_t __i;                                   \
  119         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  120                 (d)->__bits[__i] |= (s)->__bits[__i];   \
  121 } while (0)
  122 
  123 #define CPU_AND(d, s) do {                              \
  124         __size_t __i;                                   \
  125         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  126                 (d)->__bits[__i] &= (s)->__bits[__i];   \
  127 } while (0)
  128 
  129 #define CPU_NAND(d, s) do {                             \
  130         __size_t __i;                                   \
  131         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  132                 (d)->__bits[__i] &= ~(s)->__bits[__i];  \
  133 } while (0)
  134 
  135 #define CPU_CLR_ATOMIC(n, p)                                            \
  136         atomic_clear_long(&(p)->__bits[__cpuset_word(n)], __cpuset_mask(n))
  137 
  138 #define CPU_SET_ATOMIC(n, p)                                            \
  139         atomic_set_long(&(p)->__bits[__cpuset_word(n)], __cpuset_mask(n))
  140 
  141 /* Convenience functions catering special cases. */ 
  142 #define CPU_OR_ATOMIC(d, s) do {                        \
  143         __size_t __i;                                   \
  144         for (__i = 0; __i < _NCPUWORDS; __i++)          \
  145                 atomic_set_long(&(d)->__bits[__i],      \
  146                     (s)->__bits[__i]);                  \
  147 } while (0)
  148 
  149 #define CPU_COPY_STORE_REL(f, t) do {                           \
  150         __size_t __i;                                           \
  151         for (__i = 0; __i < _NCPUWORDS; __i++)                  \
  152                 atomic_store_rel_long(&(t)->__bits[__i],        \
  153                     (f)->__bits[__i]);                          \
  154 } while (0)
  155 
  156 /*
  157  * Valid cpulevel_t values.
  158  */
  159 #define CPU_LEVEL_ROOT          1       /* All system cpus. */
  160 #define CPU_LEVEL_CPUSET        2       /* Available cpus for which. */
  161 #define CPU_LEVEL_WHICH         3       /* Actual mask/id for which. */
  162 
  163 /*
  164  * Valid cpuwhich_t values.
  165  */
  166 #define CPU_WHICH_TID           1       /* Specifies a thread id. */
  167 #define CPU_WHICH_PID           2       /* Specifies a process id. */
  168 #define CPU_WHICH_CPUSET        3       /* Specifies a set id. */
  169 #define CPU_WHICH_IRQ           4       /* Specifies an irq #. */
  170 #define CPU_WHICH_JAIL          5       /* Specifies a jail id. */
  171 
  172 /*
  173  * Reserved cpuset identifiers.
  174  */
  175 #define CPUSET_INVALID  -1
  176 #define CPUSET_DEFAULT  0
  177 
  178 #ifdef _KERNEL
  179 LIST_HEAD(setlist, cpuset);
  180 
  181 /*
  182  * cpusets encapsulate cpu binding information for one or more threads.
  183  *
  184  *      a - Accessed with atomics.
  185  *      s - Set at creation, never modified.  Only a ref required to read.
  186  *      c - Locked internally by a cpuset lock.
  187  *
  188  * The bitmask is only modified while holding the cpuset lock.  It may be
  189  * read while only a reference is held but the consumer must be prepared
  190  * to deal with inconsistent results.
  191  */
  192 struct cpuset {
  193         cpuset_t                cs_mask;        /* bitmask of valid cpus. */
  194         volatile u_int          cs_ref;         /* (a) Reference count. */
  195         int                     cs_flags;       /* (s) Flags from below. */
  196         cpusetid_t              cs_id;          /* (s) Id or INVALID. */
  197         struct cpuset           *cs_parent;     /* (s) Pointer to our parent. */
  198         LIST_ENTRY(cpuset)      cs_link;        /* (c) All identified sets. */
  199         LIST_ENTRY(cpuset)      cs_siblings;    /* (c) Sibling set link. */
  200         struct setlist          cs_children;    /* (c) List of children. */
  201 };
  202 
  203 #define CPU_SET_ROOT    0x0001  /* Set is a root set. */
  204 #define CPU_SET_RDONLY  0x0002  /* No modification allowed. */
  205 
  206 extern cpuset_t *cpuset_root;
  207 struct prison;
  208 struct proc;
  209 
  210 struct cpuset *cpuset_thread0(void);
  211 struct cpuset *cpuset_ref(struct cpuset *);
  212 void    cpuset_rel(struct cpuset *);
  213 int     cpuset_setthread(lwpid_t id, cpuset_t *);
  214 int     cpuset_create_root(struct prison *, struct cpuset **);
  215 int     cpuset_setproc_update_set(struct proc *, struct cpuset *);
  216 int     cpusetobj_ffs(const cpuset_t *);
  217 char    *cpusetobj_strprint(char *, const cpuset_t *);
  218 int     cpusetobj_strscan(cpuset_t *, const char *);
  219 
  220 #else
  221 __BEGIN_DECLS
  222 int     cpuset(cpusetid_t *);
  223 int     cpuset_setid(cpuwhich_t, id_t, cpusetid_t);
  224 int     cpuset_getid(cpulevel_t, cpuwhich_t, id_t, cpusetid_t *);
  225 int     cpuset_getaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, cpuset_t *);
  226 int     cpuset_setaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, const cpuset_t *);
  227 __END_DECLS
  228 #endif
  229 #endif /* !_SYS_CPUSET_H_ */
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FreeBSD/Linux Kernel Cross Reference sys/sys/cpuset.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/cpuset.h
