libvirt/src/nodeinfo.c

/*
 * nodeinfo.c: Helper routines for OS specific node information
 *
 * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
 * Copyright (C) 2006 Daniel P. Berrange
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 * Author: Daniel P. Berrange <berrange@redhat.com>
 */

#include <config.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>

#if HAVE_NUMACTL
# define NUMA_VERSION1_COMPATIBILITY 1
# include <numa.h>
#endif

#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif

#include "c-ctype.h"
#include "memory.h"
#include "nodeinfo.h"
#include "physmem.h"
#include "util.h"
#include "virterror_internal.h"


#define VIR_FROM_THIS VIR_FROM_NONE

#ifdef __linux__
#define CPUINFO_PATH "/proc/cpuinfo"

/* NB, these are not static as we need to call them from testsuite */
int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo,
                             virNodeInfoPtr nodeinfo);

int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo, virNodeInfoPtr nodeinfo) {
    char line[1024];

    nodeinfo->cpus = 0;
    nodeinfo->mhz = 0;
    nodeinfo->nodes = nodeinfo->sockets = nodeinfo->cores = nodeinfo->threads = 1;

    /* NB: It is impossible to fill our nodes, since cpuinfo
     * has not knowledge of NUMA nodes */

    /* XXX hyperthreads */
    while (fgets(line, sizeof(line), cpuinfo) != NULL) {
        char *buf = line;
        if (STRPREFIX(buf, "processor")) { /* aka a single logical CPU */
            buf += 9;
            while (*buf && c_isspace(*buf))
                buf++;
            if (*buf != ':') {
                virRaiseError(conn, NULL, NULL, 0, VIR_ERR_INTERNAL_ERROR,
                                VIR_ERR_ERROR, NULL, NULL, NULL, 0, 0,
                                "parsing cpuinfo processor");
                return -1;
            }
            nodeinfo->cpus++;
        } else if (STRPREFIX(buf, "cpu MHz")) {
            char *p;
            unsigned int ui;
            buf += 9;
            while (*buf && c_isspace(*buf))
                buf++;
            if (*buf != ':' || !buf[1]) {
                virRaiseError(conn, NULL, NULL, 0, VIR_ERR_INTERNAL_ERROR,
                                VIR_ERR_ERROR, NULL, NULL, NULL, 0, 0,
                                "parsing cpuinfo cpu MHz");
                return -1;
            }
            if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0
                /* Accept trailing fractional part.  */
                && (*p == '\0' || *p == '.' || c_isspace(*p)))
                nodeinfo->mhz = ui;
        } else if (STRPREFIX(buf, "cpu cores")) { /* aka cores */
            char *p;
            unsigned int id;
            buf += 9;
            while (*buf && c_isspace(*buf))
                buf++;
            if (*buf != ':' || !buf[1]) {
                virRaiseError(conn, NULL, NULL, 0, VIR_ERR_INTERNAL_ERROR,
                                VIR_ERR_ERROR, NULL, NULL, NULL, 0, 0,
                                "parsing cpuinfo cpu cores %c", *buf);
                return -1;
            }
            if (virStrToLong_ui(buf+1, &p, 10, &id) == 0
                && (*p == '\0' || c_isspace(*p))
                && id > nodeinfo->cores)
                nodeinfo->cores = id;
        }
    }

    if (!nodeinfo->cpus) {
        virRaiseError(conn, NULL, NULL, 0, VIR_ERR_INTERNAL_ERROR,
                        VIR_ERR_ERROR, NULL, NULL, NULL, 0, 0,
                        "no cpus found");
        return -1;
    }

    /*
     * Can't reliably count sockets from proc metadata, so
     * infer it based on total CPUs vs cores.
     * XXX hyperthreads
     */
    nodeinfo->sockets = nodeinfo->cpus / nodeinfo->cores;

    return 0;
}

#endif

int virNodeInfoPopulate(virConnectPtr conn,
                        virNodeInfoPtr nodeinfo) {
#ifdef HAVE_UNAME
    struct utsname info;

    uname(&info);

    strncpy(nodeinfo->model, info.machine, sizeof(nodeinfo->model)-1);
    nodeinfo->model[sizeof(nodeinfo->model)-1] = '\0';

#else /* !HAVE_UNAME */

    nodeinfo->model[0] = '\0';

#endif /* !HAVE_UNAME */

#ifdef __linux__
    {
    int ret;
    FILE *cpuinfo = fopen(CPUINFO_PATH, "r");
    if (!cpuinfo) {
        virReportSystemError(conn, errno,
                             _("cannot open %s"), CPUINFO_PATH);
        return -1;
    }
    ret = linuxNodeInfoCPUPopulate(conn, cpuinfo, nodeinfo);
    fclose(cpuinfo);
    if (ret < 0)
        return -1;

    /* Convert to KB. */
    nodeinfo->memory = physmem_total () / 1024;

    return ret;
    }
#else
    /* XXX Solaris will need an impl later if they port QEMU driver */
    virRaiseError(conn, NULL, NULL, 0, VIR_ERR_INTERNAL_ERROR,
                    VIR_ERR_ERROR, NULL, NULL, NULL, 0, 0,
                    "%s:%s not implemented on this platform\n", __FILE__, __FUNCTION__);
    return -1;
#endif
}

#if HAVE_NUMACTL
# if LIBNUMA_API_VERSION <= 1
#  define NUMA_MAX_N_CPUS 4096
# else
#  define NUMA_MAX_N_CPUS (numa_all_cpus_ptr->size)
# endif

# define n_bits(var) (8 * sizeof(var))
# define MASK_CPU_ISSET(mask, cpu) \
  (((mask)[((cpu) / n_bits(*(mask)))] >> ((cpu) % n_bits(*(mask)))) & 1)

int
virCapsInitNUMA(virCapsPtr caps)
{
    int n;
    unsigned long *mask = NULL;
    int *cpus = NULL;
    int ret = -1;
    int max_n_cpus = NUMA_MAX_N_CPUS;

    if (numa_available() < 0)
        return 0;

    int mask_n_bytes = max_n_cpus / 8;
    if (VIR_ALLOC_N(mask, mask_n_bytes / sizeof *mask) < 0)
        goto cleanup;

    for (n = 0 ; n <= numa_max_node() ; n++) {
        int i;
        int ncpus;
        if (numa_node_to_cpus(n, mask, mask_n_bytes) < 0)
            goto cleanup;

        for (ncpus = 0, i = 0 ; i < max_n_cpus ; i++)
            if (MASK_CPU_ISSET(mask, i))
                ncpus++;

        if (VIR_ALLOC_N(cpus, ncpus) < 0)
            goto cleanup;

        for (ncpus = 0, i = 0 ; i < max_n_cpus ; i++)
            if (MASK_CPU_ISSET(mask, i))
                cpus[ncpus++] = i;

        if (virCapabilitiesAddHostNUMACell(caps,
                                           n,
                                           ncpus,
                                           cpus) < 0)
            goto cleanup;

        VIR_FREE(cpus);
    }

    ret = 0;

cleanup:
    VIR_FREE(cpus);
    VIR_FREE(mask);
    return ret;
}
#else
int virCapsInitNUMA(virCapsPtr caps ATTRIBUTE_UNUSED) { return 0; }
#endif