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/kern/subr_pcpu.c

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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 
   31 /*
   32  * This module provides MI support for per-cpu data.
   33  *
   34  * Each architecture determines the mapping of logical CPU IDs to physical
   35  * CPUs.  The requirements of this mapping are as follows:
   36  *  - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1.
   37  *  - The mapping is not required to be dense.  That is, there may be
   38  *    gaps in the mappings.
   39  *  - The platform sets the value of MAXCPU in <machine/param.h>.
   40  *  - It is suggested, but not required, that in the non-SMP case, the
   41  *    platform define MAXCPU to be 1 and define the logical ID of the
   42  *    sole CPU as 0.
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD: releng/5.4/sys/kern/subr_pcpu.c 145335 2005-04-20 19:11:07Z cvs2svn $");
   47 
   48 #include "opt_ddb.h"
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/linker_set.h>
   53 #include <sys/lock.h>
   54 #include <sys/pcpu.h>
   55 #include <sys/proc.h>
   56 #include <ddb/ddb.h>
   57 
   58 static struct pcpu *cpuid_to_pcpu[MAXCPU];
   59 struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
   60 
   61 /*
   62  * Initialize the MI portions of a struct pcpu.
   63  */
   64 void
   65 pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
   66 {
   67 
   68         bzero(pcpu, size);
   69         KASSERT(cpuid >= 0 && cpuid < MAXCPU,
   70             ("pcpu_init: invalid cpuid %d", cpuid));
   71         pcpu->pc_cpuid = cpuid;
   72         pcpu->pc_cpumask = 1 << cpuid;
   73         cpuid_to_pcpu[cpuid] = pcpu;
   74         SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu);
   75         cpu_pcpu_init(pcpu, cpuid, size);
   76 }
   77 
   78 /*
   79  * Destroy a struct pcpu.
   80  */
   81 void
   82 pcpu_destroy(struct pcpu *pcpu)
   83 {
   84 
   85         SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu);
   86         cpuid_to_pcpu[pcpu->pc_cpuid] = NULL;
   87 }
   88 
   89 /*
   90  * Locate a struct pcpu by cpu id.
   91  */
   92 struct pcpu *
   93 pcpu_find(u_int cpuid)
   94 {
   95 
   96         return (cpuid_to_pcpu[cpuid]);
   97 }
   98 
   99 #ifdef DDB
  100 DB_SHOW_COMMAND(pcpu, db_show_pcpu)
  101 {
  102         struct pcpu *pc;
  103         struct thread *td;
  104         int id;
  105 
  106         if (have_addr)
  107                 id = ((addr >> 4) % 16) * 10 + (addr % 16);
  108         else
  109                 id = PCPU_GET(cpuid);
  110         pc = pcpu_find(id);
  111         if (pc == NULL) {
  112                 db_printf("CPU %d not found\n", id);
  113                 return;
  114         }
  115         db_printf("cpuid        = %d\n", pc->pc_cpuid);
  116         db_printf("curthread    = ");
  117         td = pc->pc_curthread;
  118         if (td != NULL)
  119                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  120                     td->td_proc->p_comm);
  121         else
  122                 db_printf("none\n");
  123         db_printf("curpcb       = %p\n", pc->pc_curpcb);
  124         db_printf("fpcurthread  = ");
  125         td = pc->pc_fpcurthread;
  126         if (td != NULL)
  127                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  128                     td->td_proc->p_comm);
  129         else
  130                 db_printf("none\n");
  131         db_printf("idlethread   = ");
  132         td = pc->pc_idlethread;
  133         if (td != NULL)
  134                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  135                     td->td_proc->p_comm);
  136         else
  137                 db_printf("none\n");
  138         db_show_mdpcpu(pc);
  139                 
  140 #ifdef WITNESS
  141         db_printf("spin locks held:\n");
  142         witness_list_locks(&pc->pc_spinlocks);
  143 #endif
  144 }
  145 #endif

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