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| Current File : //sys/sys/cpuset.h |
/*-
* Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
* All rights reserved.
*
* Copyright (c) 2008 Nokia Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/sys/cpuset.h 233598 2012-03-28 10:15:42Z mav $
*/
#ifndef _SYS_CPUSET_H_
#define _SYS_CPUSET_H_
#include <sys/_cpuset.h>
#define CPUSETBUFSIZ ((2 + sizeof(long) * 2) * _NCPUWORDS)
/*
* Macros addressing word and bit within it, tuned to make compiler
* optimize cases when CPU_SETSIZE fits into single machine word.
*/
#define __cpuset_mask(n) \
((long)1 << ((_NCPUWORDS == 1) ? (__size_t)(n) : ((n) % _NCPUBITS)))
#define __cpuset_word(n) ((_NCPUWORDS == 1) ? 0 : ((n) / _NCPUBITS))
#define CPU_CLR(n, p) ((p)->__bits[__cpuset_word(n)] &= ~__cpuset_mask(n))
#define CPU_COPY(f, t) (void)(*(t) = *(f))
#define CPU_ISSET(n, p) (((p)->__bits[__cpuset_word(n)] & __cpuset_mask(n)) != 0)
#define CPU_SET(n, p) ((p)->__bits[__cpuset_word(n)] |= __cpuset_mask(n))
#define CPU_ZERO(p) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
(p)->__bits[__i] = 0; \
} while (0)
#define CPU_FILL(p) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
(p)->__bits[__i] = -1; \
} while (0)
#define CPU_SETOF(n, p) do { \
CPU_ZERO(p); \
((p)->__bits[__cpuset_word(n)] = __cpuset_mask(n)); \
} while (0)
/* Is p empty. */
#define CPU_EMPTY(p) __extension__ ({ \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
if ((p)->__bits[__i]) \
break; \
__i == _NCPUWORDS; \
})
/* Is p full set. */
#define CPU_ISFULLSET(p) __extension__ ({ \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
if ((p)->__bits[__i] != (long)-1) \
break; \
__i == _NCPUWORDS; \
})
/* Is c a subset of p. */
#define CPU_SUBSET(p, c) __extension__ ({ \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
if (((c)->__bits[__i] & \
(p)->__bits[__i]) != \
(c)->__bits[__i]) \
break; \
__i == _NCPUWORDS; \
})
/* Are there any common bits between b & c? */
#define CPU_OVERLAP(p, c) __extension__ ({ \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
if (((c)->__bits[__i] & \
(p)->__bits[__i]) != 0) \
break; \
__i != _NCPUWORDS; \
})
/* Compare two sets, returns 0 if equal 1 otherwise. */
#define CPU_CMP(p, c) __extension__ ({ \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
if (((c)->__bits[__i] != \
(p)->__bits[__i])) \
break; \
__i != _NCPUWORDS; \
})
#define CPU_OR(d, s) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
(d)->__bits[__i] |= (s)->__bits[__i]; \
} while (0)
#define CPU_AND(d, s) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
(d)->__bits[__i] &= (s)->__bits[__i]; \
} while (0)
#define CPU_NAND(d, s) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
(d)->__bits[__i] &= ~(s)->__bits[__i]; \
} while (0)
#define CPU_CLR_ATOMIC(n, p) \
atomic_clear_long(&(p)->__bits[__cpuset_word(n)], __cpuset_mask(n))
#define CPU_SET_ATOMIC(n, p) \
atomic_set_long(&(p)->__bits[__cpuset_word(n)], __cpuset_mask(n))
/* Convenience functions catering special cases. */
#define CPU_OR_ATOMIC(d, s) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
atomic_set_long(&(d)->__bits[__i], \
(s)->__bits[__i]); \
} while (0)
#define CPU_COPY_STORE_REL(f, t) do { \
__size_t __i; \
for (__i = 0; __i < _NCPUWORDS; __i++) \
atomic_store_rel_long(&(t)->__bits[__i], \
(f)->__bits[__i]); \
} while (0)
/*
* Valid cpulevel_t values.
*/
#define CPU_LEVEL_ROOT 1 /* All system cpus. */
#define CPU_LEVEL_CPUSET 2 /* Available cpus for which. */
#define CPU_LEVEL_WHICH 3 /* Actual mask/id for which. */
/*
* Valid cpuwhich_t values.
*/
#define CPU_WHICH_TID 1 /* Specifies a thread id. */
#define CPU_WHICH_PID 2 /* Specifies a process id. */
#define CPU_WHICH_CPUSET 3 /* Specifies a set id. */
#define CPU_WHICH_IRQ 4 /* Specifies an irq #. */
#define CPU_WHICH_JAIL 5 /* Specifies a jail id. */
/*
* Reserved cpuset identifiers.
*/
#define CPUSET_INVALID -1
#define CPUSET_DEFAULT 0
#ifdef _KERNEL
LIST_HEAD(setlist, cpuset);
/*
* cpusets encapsulate cpu binding information for one or more threads.
*
* a - Accessed with atomics.
* s - Set at creation, never modified. Only a ref required to read.
* c - Locked internally by a cpuset lock.
*
* The bitmask is only modified while holding the cpuset lock. It may be
* read while only a reference is held but the consumer must be prepared
* to deal with inconsistent results.
*/
struct cpuset {
cpuset_t cs_mask; /* bitmask of valid cpus. */
volatile u_int cs_ref; /* (a) Reference count. */
int cs_flags; /* (s) Flags from below. */
cpusetid_t cs_id; /* (s) Id or INVALID. */
struct cpuset *cs_parent; /* (s) Pointer to our parent. */
LIST_ENTRY(cpuset) cs_link; /* (c) All identified sets. */
LIST_ENTRY(cpuset) cs_siblings; /* (c) Sibling set link. */
struct setlist cs_children; /* (c) List of children. */
};
#define CPU_SET_ROOT 0x0001 /* Set is a root set. */
#define CPU_SET_RDONLY 0x0002 /* No modification allowed. */
extern cpuset_t *cpuset_root;
struct prison;
struct proc;
struct cpuset *cpuset_thread0(void);
struct cpuset *cpuset_ref(struct cpuset *);
void cpuset_rel(struct cpuset *);
int cpuset_setthread(lwpid_t id, cpuset_t *);
int cpuset_create_root(struct prison *, struct cpuset **);
int cpuset_setproc_update_set(struct proc *, struct cpuset *);
int cpusetobj_ffs(const cpuset_t *);
char *cpusetobj_strprint(char *, const cpuset_t *);
int cpusetobj_strscan(cpuset_t *, const char *);
#else
__BEGIN_DECLS
int cpuset(cpusetid_t *);
int cpuset_setid(cpuwhich_t, id_t, cpusetid_t);
int cpuset_getid(cpulevel_t, cpuwhich_t, id_t, cpusetid_t *);
int cpuset_getaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, cpuset_t *);
int cpuset_setaffinity(cpulevel_t, cpuwhich_t, id_t, size_t, const cpuset_t *);
__END_DECLS
#endif
#endif /* !_SYS_CPUSET_H_ */