libvirt/src/conf/device_conf.c

/*
 * device_conf.c: device XML handling
 *
 * Copyright (C) 2006-2012 Red Hat, Inc.
 *
 * 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, see
 * <http://www.gnu.org/licenses/>.
 *
 * Author: Daniel P. Berrange <berrange@redhat.com>
 */

#include <config.h>
#include "virterror_internal.h"
#include "datatypes.h"
#include "memory.h"
#include "xml.h"
#include "uuid.h"
#include "util.h"
#include "virbuffer.h"
#include "device_conf.h"

#define VIR_FROM_THIS VIR_FROM_DEVICE

VIR_ENUM_IMPL(virDeviceAddressPciMulti,
              VIR_DEVICE_ADDRESS_PCI_MULTI_LAST,
              "default",
              "on",
              "off")

int virDevicePCIAddressIsValid(virDevicePCIAddressPtr addr)
{
    /* PCI bus has 32 slots and 8 functions per slot */
    if (addr->slot >= 32 || addr->function >= 8)
        return 0;
    return addr->domain || addr->bus || addr->slot;
}


int
virDevicePCIAddressParseXML(xmlNodePtr node,
                            virDevicePCIAddressPtr addr)
{
    char *domain, *slot, *bus, *function, *multi;
    int ret = -1;

    memset(addr, 0, sizeof(*addr));

    domain   = virXMLPropString(node, "domain");
    bus      = virXMLPropString(node, "bus");
    slot     = virXMLPropString(node, "slot");
    function = virXMLPropString(node, "function");
    multi    = virXMLPropString(node, "multifunction");

    if (domain &&
        virStrToLong_ui(domain, NULL, 0, &addr->domain) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot parse <address> 'domain' attribute"));
        goto cleanup;
    }

    if (bus &&
        virStrToLong_ui(bus, NULL, 0, &addr->bus) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot parse <address> 'bus' attribute"));
        goto cleanup;
    }

    if (slot &&
        virStrToLong_ui(slot, NULL, 0, &addr->slot) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot parse <address> 'slot' attribute"));
        goto cleanup;
    }

    if (function &&
        virStrToLong_ui(function, NULL, 0, &addr->function) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot parse <address> 'function' attribute"));
        goto cleanup;
    }

    if (multi &&
        ((addr->multi = virDeviceAddressPciMultiTypeFromString(multi)) <= 0)) {
        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                       _("Unknown value '%s' for <address> 'multifunction' attribute"),
                       multi);
        goto cleanup;

    }
    if (!virDevicePCIAddressIsValid(addr)) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Insufficient specification for PCI address"));
        goto cleanup;
    }

    ret = 0;

cleanup:
    VIR_FREE(domain);
    VIR_FREE(bus);
    VIR_FREE(slot);
    VIR_FREE(function);
    VIR_FREE(multi);
    return ret;
}

int
virDevicePCIAddressFormat(virBufferPtr buf,
                          virDevicePCIAddress addr,
                          bool includeTypeInAddr)
{
    virBufferAsprintf(buf, "<address %sdomain='0x%.4x' bus='0x%.2x' "
                      "slot='0x%.2x' function='0x%.1x'/>\n",
                      includeTypeInAddr ? "type='pci' " : "",
                      addr.domain,
                      addr.bus,
                      addr.slot,
                      addr.function);
    return 0;
}

bool
virDevicePCIAddressEqual(virDevicePCIAddress *addr1,
                         virDevicePCIAddress *addr2)
{
    if (addr1->domain == addr2->domain &&
        addr1->bus == addr2->bus &&
        addr1->slot == addr2->slot &&
        addr1->function == addr2->function) {
        return true;
    }
    return false;
}