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145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
/*
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* Copyright (c) 2001 Wind River Systems, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This module provides MI support for per-cpu data.
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*
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* Each architecture determines the mapping of logical CPU IDs to physical
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* CPUs. The requirements of this mapping are as follows:
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* - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1.
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* - The mapping is not required to be dense. That is, there may be
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* gaps in the mappings.
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* - The platform sets the value of MAXCPU in <machine/param.h>.
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* - It is suggested, but not required, that in the non-SMP case, the
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* platform define MAXCPU to be 1 and define the logical ID of the
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* sole CPU as 0.
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/linker_set.h>
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#include <sys/lock.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <ddb/ddb.h>
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static struct pcpu *cpuid_to_pcpu[MAXCPU];
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struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
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/*
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* Initialize the MI portions of a struct pcpu.
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*/
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void
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pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
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{
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bzero(pcpu, size);
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KASSERT(cpuid >= 0 && cpuid < MAXCPU,
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("pcpu_init: invalid cpuid %d", cpuid));
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pcpu->pc_cpuid = cpuid;
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pcpu->pc_cpumask = 1 << cpuid;
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cpuid_to_pcpu[cpuid] = pcpu;
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SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu);
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cpu_pcpu_init(pcpu, cpuid, size);
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}
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/*
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* Destroy a struct pcpu.
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*/
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void
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pcpu_destroy(struct pcpu *pcpu)
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{
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SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu);
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cpuid_to_pcpu[pcpu->pc_cpuid] = NULL;
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}
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/*
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* Locate a struct pcpu by cpu id.
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*/
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struct pcpu *
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pcpu_find(u_int cpuid)
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{
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return (cpuid_to_pcpu[cpuid]);
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}
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#ifdef DDB
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DB_SHOW_COMMAND(pcpu, db_show_pcpu)
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{
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struct pcpu *pc;
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struct thread *td;
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int id;
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if (have_addr)
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id = ((addr >> 4) % 16) * 10 + (addr % 16);
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else
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id = PCPU_GET(cpuid);
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pc = pcpu_find(id);
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if (pc == NULL) {
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db_printf("CPU %d not found\n", id);
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return;
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}
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db_printf("cpuid = %d\n", pc->pc_cpuid);
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db_printf("curthread = ");
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td = pc->pc_curthread;
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if (td != NULL)
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db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
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td->td_proc->p_comm);
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else
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db_printf("none\n");
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db_printf("curpcb = %p\n", pc->pc_curpcb);
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db_printf("fpcurthread = ");
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td = pc->pc_fpcurthread;
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if (td != NULL)
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db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
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td->td_proc->p_comm);
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else
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db_printf("none\n");
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db_printf("idlethread = ");
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td = pc->pc_idlethread;
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if (td != NULL)
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db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
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td->td_proc->p_comm);
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else
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db_printf("none\n");
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db_show_mdpcpu(pc);
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#ifdef WITNESS
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db_printf("spin locks held:\n");
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witness_list_locks(&pc->pc_spinlocks);
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#endif
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}
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#endif
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