The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2001 Wind River Systems, Inc.
    3  * All rights reserved.
    4  * Written by: John Baldwin <jhb@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the author nor the names of any co-contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_PCPU_H_
   34 #define _SYS_PCPU_H_
   35 
   36 #ifdef LOCORE
   37 #error "no assembler-serviceable parts inside"
   38 #endif
   39 
   40 #include <sys/queue.h>
   41 #include <sys/vmmeter.h>
   42 #include <sys/resource.h>
   43 #include <machine/pcpu.h>
   44 
   45 #ifdef _KERNEL
   46 
   47 /*
   48  * Define a set for pcpu data.
   49  */
   50 extern uintptr_t *__start_set_pcpu;
   51 __GLOBL(__start_set_pcpu);
   52 extern uintptr_t *__stop_set_pcpu;
   53 __GLOBL(__stop_set_pcpu);
   54 
   55 /*
   56  * Array of dynamic pcpu base offsets.  Indexed by id.
   57  */
   58 extern uintptr_t dpcpu_off[];
   59 
   60 /*
   61  * Convenience defines.
   62  */
   63 #define DPCPU_START             ((uintptr_t)&__start_set_pcpu)
   64 #define DPCPU_STOP              ((uintptr_t)&__stop_set_pcpu)
   65 #define DPCPU_BYTES             (DPCPU_STOP - DPCPU_START)
   66 #define DPCPU_MODMIN            2048
   67 #define DPCPU_SIZE              roundup2(DPCPU_BYTES, PAGE_SIZE)
   68 #define DPCPU_MODSIZE           (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN))
   69 
   70 /*
   71  * Declaration and definition.
   72  */
   73 #define DPCPU_NAME(n)           pcpu_entry_##n
   74 #define DPCPU_DECLARE(t, n)     extern t DPCPU_NAME(n)
   75 #define DPCPU_DEFINE(t, n)      t DPCPU_NAME(n) __section("set_pcpu") __used
   76 
   77 /*
   78  * Accessors with a given base.
   79  */
   80 #define _DPCPU_PTR(b, n)                                                \
   81     (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
   82 #define _DPCPU_GET(b, n)        (*_DPCPU_PTR(b, n))
   83 #define _DPCPU_SET(b, n, v)     (*_DPCPU_PTR(b, n) = v)
   84 
   85 /*
   86  * Accessors for the current cpu.
   87  */
   88 #define DPCPU_PTR(n)            _DPCPU_PTR(PCPU_GET(dynamic), n)
   89 #define DPCPU_GET(n)            (*DPCPU_PTR(n))
   90 #define DPCPU_SET(n, v)         (*DPCPU_PTR(n) = v)
   91 
   92 /*
   93  * Accessors for remote cpus.
   94  */
   95 #define DPCPU_ID_PTR(i, n)      _DPCPU_PTR(dpcpu_off[(i)], n)
   96 #define DPCPU_ID_GET(i, n)      (*DPCPU_ID_PTR(i, n))
   97 #define DPCPU_ID_SET(i, n, v)   (*DPCPU_ID_PTR(i, n) = v)
   98 
   99 /*
  100  * Utility macros.
  101  */
  102 #define DPCPU_SUM(n) __extension__                                      \
  103 ({                                                                      \
  104         u_int _i;                                                       \
  105         __typeof(*DPCPU_PTR(n)) sum;                                    \
  106                                                                         \
  107         sum = 0;                                                        \
  108         CPU_FOREACH(_i) {                                               \
  109                 sum += *DPCPU_ID_PTR(_i, n);                            \
  110         }                                                               \
  111         sum;                                                            \
  112 })
  113 
  114 #define DPCPU_VARSUM(n, var) __extension__                              \
  115 ({                                                                      \
  116         u_int _i;                                                       \
  117         __typeof((DPCPU_PTR(n))->var) sum;                              \
  118                                                                         \
  119         sum = 0;                                                        \
  120         CPU_FOREACH(_i) {                                               \
  121                 sum += (DPCPU_ID_PTR(_i, n))->var;                      \
  122         }                                                               \
  123         sum;                                                            \
  124 })
  125 
  126 #define DPCPU_ZERO(n) do {                                              \
  127         u_int _i;                                                       \
  128                                                                         \
  129         CPU_FOREACH(_i) {                                               \
  130                 bzero(DPCPU_ID_PTR(_i, n), sizeof(*DPCPU_PTR(n)));      \
  131         }                                                               \
  132 } while(0)
  133 
  134 #endif /* _KERNEL */
  135 
  136 /* 
  137  * XXXUPS remove as soon as we have per cpu variable
  138  * linker sets and can define rm_queue in _rm_lock.h
  139  */
  140 struct rm_queue {
  141         struct rm_queue* volatile rmq_next;
  142         struct rm_queue* volatile rmq_prev;
  143 };
  144 
  145 #define PCPU_NAME_LEN (sizeof("CPU ") + sizeof(__XSTRING(MAXCPU) + 1))
  146 
  147 /*
  148  * This structure maps out the global data that needs to be kept on a
  149  * per-cpu basis.  The members are accessed via the PCPU_GET/SET/PTR
  150  * macros defined in <machine/pcpu.h>.  Machine dependent fields are
  151  * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
  152  */
  153 struct pcpu {
  154         struct thread   *pc_curthread;          /* Current thread */
  155         struct thread   *pc_idlethread;         /* Idle thread */
  156         struct thread   *pc_fpcurthread;        /* Fp state owner */
  157         struct thread   *pc_deadthread;         /* Zombie thread or NULL */
  158         struct pcb      *pc_curpcb;             /* Current pcb */
  159         uint64_t        pc_switchtime;          /* cpu_ticks() at last csw */
  160         int             pc_switchticks;         /* `ticks' at last csw */
  161         u_int           pc_cpuid;               /* This cpu number */
  162         cpumask_t       pc_cpumask;             /* This cpu mask */
  163         cpumask_t       pc_other_cpus;          /* Mask of all other cpus */
  164         SLIST_ENTRY(pcpu) pc_allcpu;
  165         struct lock_list_entry *pc_spinlocks;
  166 #ifdef KTR
  167         char            pc_name[PCPU_NAME_LEN]; /* String name for KTR */
  168 #endif
  169         struct vmmeter  pc_cnt;                 /* VM stats counters */
  170         long            pc_cp_time[CPUSTATES];  /* statclock ticks */
  171         struct device   *pc_device;
  172         void            *pc_netisr;             /* netisr SWI cookie */
  173 
  174         /*
  175          * Stuff for read mostly lock
  176          *
  177          * XXXUPS remove as soon as we have per cpu variable
  178          * linker sets.
  179          */
  180         struct rm_queue pc_rm_queue;
  181 
  182         uintptr_t       pc_dynamic;             /* Dynamic per-cpu data area */
  183 
  184         /*
  185          * Keep MD fields last, so that CPU-specific variations on a
  186          * single architecture don't result in offset variations of
  187          * the machine-independent fields of the pcpu.  Even though
  188          * the pcpu structure is private to the kernel, some ports
  189          * (e.g., lsof, part of gtop) define _KERNEL and include this
  190          * header.  While strictly speaking this is wrong, there's no
  191          * reason not to keep the offsets of the MI fields constant
  192          * if only to make kernel debugging easier.
  193          */
  194         PCPU_MD_FIELDS;
  195 } __aligned(128);
  196 
  197 #ifdef _KERNEL
  198 
  199 SLIST_HEAD(cpuhead, pcpu);
  200 
  201 extern struct cpuhead cpuhead;
  202 extern struct pcpu *cpuid_to_pcpu[MAXCPU];
  203 
  204 #define curcpu          PCPU_GET(cpuid)
  205 #define curproc         (curthread->td_proc)
  206 #ifndef curthread
  207 #define curthread       PCPU_GET(curthread)
  208 #endif
  209 #define curvidata       PCPU_GET(vidata)
  210 
  211 /*
  212  * Machine dependent callouts.  cpu_pcpu_init() is responsible for
  213  * initializing machine dependent fields of struct pcpu, and
  214  * db_show_mdpcpu() is responsible for handling machine dependent
  215  * fields for the DDB 'show pcpu' command.
  216  */
  217 void    cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
  218 void    db_show_mdpcpu(struct pcpu *pcpu);
  219 
  220 void    *dpcpu_alloc(int size);
  221 void    dpcpu_copy(void *s, int size);
  222 void    dpcpu_free(void *s, int size);
  223 void    dpcpu_init(void *dpcpu, int cpuid);
  224 void    pcpu_destroy(struct pcpu *pcpu);
  225 struct  pcpu *pcpu_find(u_int cpuid);
  226 void    pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
  227 
  228 #endif /* _KERNEL */
  229 
  230 #endif /* !_SYS_PCPU_H_ */

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