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  * $FreeBSD: releng/5.0/sys/kern/subr_pcpu.c 88901 2002-01-05 09:35:50Z peter $
   31  */
   32 
   33 /*
   34  * This module provides MI support for per-cpu data.
   35  *
   36  * Each architecture determines the mapping of logical CPU IDs to physical
   37  * CPUs.  The requirements of this mapping are as follows:
   38  *  - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1.
   39  *  - The mapping is not required to be dense.  That is, there may be
   40  *    gaps in the mappings.
   41  *  - The platform sets the value of MAXCPU in <machine/param.h>.
   42  *  - It is suggested, but not required, that in the non-SMP case, the
   43  *    platform define MAXCPU to be 1 and define the logical ID of the
   44  *    sole CPU as 0.
   45  */
   46 
   47 #include "opt_ddb.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/linker_set.h>
   52 #include <sys/lock.h>
   53 #include <sys/pcpu.h>
   54 #include <sys/proc.h>
   55 #include <ddb/ddb.h>
   56 
   57 static struct pcpu *cpuid_to_pcpu[MAXCPU];
   58 struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
   59 
   60 /*
   61  * Initialize the MI portions of a struct pcpu.
   62  */
   63 void
   64 pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
   65 {
   66 
   67         bzero(pcpu, size);
   68         KASSERT(cpuid >= 0 && cpuid < MAXCPU,
   69             ("pcpu_init: invalid cpuid %d", cpuid));
   70         pcpu->pc_cpuid = cpuid;
   71         pcpu->pc_cpumask = 1 << cpuid;
   72         cpuid_to_pcpu[cpuid] = pcpu;
   73         SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu);
   74         cpu_pcpu_init(pcpu, cpuid, size);
   75 }
   76 
   77 /*
   78  * Destroy a struct pcpu.
   79  */
   80 void
   81 pcpu_destroy(struct pcpu *pcpu)
   82 {
   83 
   84         SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu);
   85         cpuid_to_pcpu[pcpu->pc_cpuid] = NULL;
   86 }
   87 
   88 /*
   89  * Locate a struct pcpu by cpu id.
   90  */
   91 struct pcpu *
   92 pcpu_find(u_int cpuid)
   93 {
   94 
   95         return (cpuid_to_pcpu[cpuid]);
   96 }
   97 
   98 #ifdef DDB
   99 DB_SHOW_COMMAND(pcpu, db_show_pcpu)
  100 {
  101         struct pcpu *pc;
  102         struct thread *td;
  103         int id;
  104 
  105         if (have_addr)
  106                 id = ((addr >> 4) % 16) * 10 + (addr % 16);
  107         else
  108                 id = PCPU_GET(cpuid);
  109         pc = pcpu_find(id);
  110         if (pc == NULL) {
  111                 db_printf("CPU %d not found\n", id);
  112                 return;
  113         }
  114         db_printf("cpuid        = %d\n", pc->pc_cpuid);
  115         db_printf("curthread    = ");
  116         td = pc->pc_curthread;
  117         if (td != NULL)
  118                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  119                     td->td_proc->p_comm);
  120         else
  121                 db_printf("none\n");
  122         db_printf("curpcb       = %p\n", pc->pc_curpcb);
  123         db_printf("fpcurthread  = ");
  124         td = pc->pc_fpcurthread;
  125         if (td != NULL)
  126                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  127                     td->td_proc->p_comm);
  128         else
  129                 db_printf("none\n");
  130         db_printf("idlethread   = ");
  131         td = pc->pc_idlethread;
  132         if (td != NULL)
  133                 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
  134                     td->td_proc->p_comm);
  135         else
  136                 db_printf("none\n");
  137         db_show_mdpcpu(pc);
  138                 
  139 #ifdef WITNESS
  140         db_printf("spin locks held:\n");
  141         witness_list_locks(&pc->pc_spinlocks);
  142 #endif
  143 }
  144 #endif

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