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9b7915859d
the per-cpu data for all CPUs. This is easier to ask users to do than "figure out how many CPUs you have, now run show pcpu, then run it once for each CPU you have". MFC after: 3 days
170 lines
4.5 KiB
C
170 lines
4.5 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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/*
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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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/smp.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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static void
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show_pcpu(struct pcpu *pc)
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{
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struct thread *td;
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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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DB_SHOW_COMMAND(pcpu, db_show_pcpu)
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{
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struct pcpu *pc;
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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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show_pcpu(pc);
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}
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DB_SHOW_COMMAND(allpcpu, db_show_cpu_all)
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{
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struct pcpu *pc;
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int id;
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db_printf("Current CPU: %d\n\n", PCPU_GET(cpuid));
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for (id = 0; id < mp_maxid; id++) {
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pc = pcpu_find(id);
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if (pc != NULL) {
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show_pcpu(pc);
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db_printf("\n");
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}
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}
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}
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#endif
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