LXR qemu/hw/pci-hotplug.c

   1/*
   2 * QEMU PCI hotplug support
   3 *
   4 * Copyright (c) 2004 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "hw.h"
  26#include "boards.h"
  27#include "pci.h"
  28#include "net.h"
  29#include "pc.h"
  30#include "monitor.h"
  31#include "scsi.h"
  32#include "virtio-blk.h"
  33#include "qemu-config.h"
  34
  35#if defined(TARGET_I386)
  36static PCIDevice *qemu_pci_hot_add_nic(Monitor *mon,
  37                                       const char *devaddr,
  38                                       const char *opts_str)
  39{
  40    QemuOpts *opts;
  41    PCIBus *bus;
  42    int ret, devfn;
  43
  44    bus = pci_get_bus_devfn(&devfn, devaddr);
  45    if (!bus) {
  46        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
  47        return NULL;
  48    }
  49    if (!((BusState*)bus)->allow_hotplug) {
  50        monitor_printf(mon, "PCI bus doesn't support hotplug\n");
  51        return NULL;
  52    }
  53
  54    opts = qemu_opts_parse(&qemu_net_opts, opts_str ? opts_str : "", 0);
  55    if (!opts) {
  56        return NULL;
  57    }
  58
  59    qemu_opt_set(opts, "type", "nic");
  60
  61    ret = net_client_init(mon, opts, 0);
  62    if (ret < 0)
  63        return NULL;
  64    if (nd_table[ret].devaddr) {
  65        monitor_printf(mon, "Parameter addr not supported\n");
  66        return NULL;
  67    }
  68    return pci_nic_init(&nd_table[ret], "rtl8139", devaddr);
  69}
  70
  71static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
  72                        DriveInfo *dinfo, int printinfo)
  73{
  74    SCSIBus *scsibus;
  75    SCSIDevice *scsidev;
  76
  77    scsibus = DO_UPCAST(SCSIBus, qbus, QLIST_FIRST(&adapter->child_bus));
  78    if (!scsibus || strcmp(scsibus->qbus.info->name, "SCSI") != 0) {
  79        error_report("Device is not a SCSI adapter");
  80        return -1;
  81    }
  82
  83    /*
  84     * drive_init() tries to find a default for dinfo->unit.  Doesn't
  85     * work at all for hotplug though as we assign the device to a
  86     * specific bus instead of the first bus with spare scsi ids.
  87     *
  88     * Ditch the calculated value and reload from option string (if
  89     * specified).
  90     */
  91    dinfo->unit = qemu_opt_get_number(dinfo->opts, "unit", -1);
  92    scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo->bdrv, dinfo->unit);
  93    if (!scsidev) {
  94        return -1;
  95    }
  96    dinfo->unit = scsidev->id;
  97
  98    if (printinfo)
  99        monitor_printf(mon, "OK bus %d, unit %d\n",
 100                       scsibus->busnr, scsidev->id);
 101    return 0;
 102}
 103
 104void drive_hot_add(Monitor *mon, const QDict *qdict)
 105{
 106    int dom, pci_bus;
 107    unsigned slot;
 108    int type;
 109    PCIDevice *dev;
 110    DriveInfo *dinfo = NULL;
 111    const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 112    const char *opts = qdict_get_str(qdict, "opts");
 113
 114    dinfo = add_init_drive(opts);
 115    if (!dinfo)
 116        goto err;
 117    if (dinfo->devaddr) {
 118        monitor_printf(mon, "Parameter addr not supported\n");
 119        goto err;
 120    }
 121    type = dinfo->type;
 122
 123    switch (type) {
 124    case IF_SCSI:
 125        if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
 126            goto err;
 127        }
 128        dev = pci_find_device(pci_find_root_bus(dom), pci_bus, slot, 0);
 129        if (!dev) {
 130            monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 131            goto err;
 132        }
 133        if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 134            goto err;
 135        }
 136        break;
 137    case IF_NONE:
 138        monitor_printf(mon, "OK\n");
 139        break;
 140    default:
 141        monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
 142        goto err;
 143    }
 144    return;
 145
 146err:
 147    if (dinfo)
 148        drive_uninit(dinfo);
 149    return;
 150}
 151
 152static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 153                                           const char *devaddr,
 154                                           const char *opts)
 155{
 156    PCIDevice *dev;
 157    DriveInfo *dinfo = NULL;
 158    int type = -1;
 159    char buf[128];
 160    PCIBus *bus;
 161    int devfn;
 162
 163    if (get_param_value(buf, sizeof(buf), "if", opts)) {
 164        if (!strcmp(buf, "scsi"))
 165            type = IF_SCSI;
 166        else if (!strcmp(buf, "virtio")) {
 167            type = IF_VIRTIO;
 168        } else {
 169            monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 170            return NULL;
 171        }
 172    } else {
 173        monitor_printf(mon, "no if= specified\n");
 174        return NULL;
 175    }
 176
 177    if (get_param_value(buf, sizeof(buf), "file", opts)) {
 178        dinfo = add_init_drive(opts);
 179        if (!dinfo)
 180            return NULL;
 181        if (dinfo->devaddr) {
 182            monitor_printf(mon, "Parameter addr not supported\n");
 183            return NULL;
 184        }
 185    } else {
 186        dinfo = NULL;
 187    }
 188
 189    bus = pci_get_bus_devfn(&devfn, devaddr);
 190    if (!bus) {
 191        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 192        return NULL;
 193    }
 194    if (!((BusState*)bus)->allow_hotplug) {
 195        monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 196        return NULL;
 197    }
 198
 199    switch (type) {
 200    case IF_SCSI:
 201        dev = pci_create(bus, devfn, "lsi53c895a");
 202        if (qdev_init(&dev->qdev) < 0)
 203            dev = NULL;
 204        if (dev && dinfo) {
 205            if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 206                qdev_unplug(&dev->qdev);
 207                dev = NULL;
 208            }
 209        }
 210        break;
 211    case IF_VIRTIO:
 212        if (!dinfo) {
 213            monitor_printf(mon, "virtio requires a backing file/device.\n");
 214            return NULL;
 215        }
 216        dev = pci_create(bus, devfn, "virtio-blk-pci");
 217        if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 218            qdev_free(&dev->qdev);
 219            dev = NULL;
 220            break;
 221        }
 222        if (qdev_init(&dev->qdev) < 0)
 223            dev = NULL;
 224        break;
 225    default:
 226        dev = NULL;
 227    }
 228    return dev;
 229}
 230
 231void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 232{
 233    PCIDevice *dev = NULL;
 234    const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 235    const char *type = qdict_get_str(qdict, "type");
 236    const char *opts = qdict_get_try_str(qdict, "opts");
 237
 238    /* strip legacy tag */
 239    if (!strncmp(pci_addr, "pci_addr=", 9)) {
 240        pci_addr += 9;
 241    }
 242
 243    if (!opts) {
 244        opts = "";
 245    }
 246
 247    if (!strcmp(pci_addr, "auto"))
 248        pci_addr = NULL;
 249
 250    if (strcmp(type, "nic") == 0) {
 251        dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 252    } else if (strcmp(type, "storage") == 0) {
 253        dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 254    } else {
 255        monitor_printf(mon, "invalid type: %s\n", type);
 256    }
 257
 258    if (dev) {
 259        monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 260                       pci_find_domain(dev->bus),
 261                       pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
 262                       PCI_FUNC(dev->devfn));
 263    } else
 264        monitor_printf(mon, "failed to add %s\n", opts);
 265}
 266#endif
 267
 268static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 269{
 270    PCIDevice *d;
 271    int dom, bus;
 272    unsigned slot;
 273
 274    if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 275        return -1;
 276    }
 277
 278    d = pci_find_device(pci_find_root_bus(dom), bus, slot, 0);
 279    if (!d) {
 280        monitor_printf(mon, "slot %d empty\n", slot);
 281        return -1;
 282    }
 283    return qdev_unplug(&d->qdev);
 284}
 285
 286void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)
 287{
 288    pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 289}
 290