153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/*-
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* Copyright (c) 2008 Yahoo!, 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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* 3. 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/pcpu.h>
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#include <sys/sysctl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdlib.h>
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#include "kvm_private.h"
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static struct nlist kvm_pcpu_nl[] = {
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{ "_cpuid_to_pcpu" },
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{ "_mp_maxcpus" },
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{ NULL },
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};
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/*
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* Kernel per-CPU data state. We cache this stuff on the first
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* access.
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*/
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static void **pcpu_data;
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static int maxcpu;
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#define NL_CPUID_TO_PCPU 0
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#define NL_MP_MAXCPUS 1
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static int
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_kvm_pcpu_init(kvm_t *kd)
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{
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size_t len;
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int max;
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void *data;
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if (kvm_nlist(kd, kvm_pcpu_nl) < 0)
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return (-1);
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if (kvm_pcpu_nl[NL_CPUID_TO_PCPU].n_value == 0) {
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_kvm_err(kd, kd->program, "unable to find cpuid_to_pcpu");
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return (-1);
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}
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if (kvm_pcpu_nl[NL_MP_MAXCPUS].n_value == 0) {
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_kvm_err(kd, kd->program, "unable to find mp_maxcpus");
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return (-1);
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}
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if (kvm_read(kd, kvm_pcpu_nl[NL_MP_MAXCPUS].n_value, &max,
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sizeof(max)) != sizeof(max)) {
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_kvm_err(kd, kd->program, "cannot read mp_maxcpus");
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return (-1);
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}
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len = max * sizeof(void *);
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data = malloc(len);
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if (data == NULL) {
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_kvm_err(kd, kd->program, "out of memory");
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return (-1);
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}
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if (kvm_read(kd, kvm_pcpu_nl[NL_CPUID_TO_PCPU].n_value, data, len) !=
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len) {
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_kvm_err(kd, kd->program, "cannot read cpuid_to_pcpu array");
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free(data);
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return (-1);
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}
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pcpu_data = data;
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maxcpu = max;
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return (0);
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}
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static void
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_kvm_pcpu_clear(void)
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{
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maxcpu = 0;
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free(pcpu_data);
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pcpu_data = NULL;
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}
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void *
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kvm_getpcpu(kvm_t *kd, int cpu)
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{
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char *buf;
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int i;
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if (kd == NULL) {
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_kvm_pcpu_clear();
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return (NULL);
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}
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if (maxcpu == 0)
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if (_kvm_pcpu_init(kd) < 0)
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return ((void *)-1);
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if (cpu >= maxcpu || pcpu_data[cpu] == NULL)
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return (NULL);
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buf = malloc(sizeof(struct pcpu));
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if (buf == NULL) {
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_kvm_err(kd, kd->program, "out of memory");
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return ((void *)-1);
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}
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if (kvm_read(kd, (uintptr_t)pcpu_data[cpu], buf, sizeof(struct pcpu)) !=
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sizeof(struct pcpu)) {
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_kvm_err(kd, kd->program, "unable to read per-CPU data");
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free(buf);
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return ((void *)-1);
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}
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return (buf);
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}
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int
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kvm_getmaxcpu(kvm_t *kd)
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{
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if (kd == NULL) {
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_kvm_pcpu_clear();
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return (0);
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}
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if (maxcpu == 0)
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if (_kvm_pcpu_init(kd) < 0)
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return (-1);
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return (maxcpu);
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}
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