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#include "blockdev.h"
  35
  36#if defined(TARGET_I386)
  37static PCIDevice *qemu_pci_hot_add_nic(Monitor *mon,
  38                                       const char *devaddr,
  39                                       const char *opts_str)
  40{
  41    QemuOpts *opts;
  42    PCIBus *bus;
  43    int ret, devfn;
  44
  45    bus = pci_get_bus_devfn(&devfn, devaddr);
  46    if (!bus) {
  47        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
  48        return NULL;
  49    }
  50    if (!((BusState*)bus)->allow_hotplug) {
  51        monitor_printf(mon, "PCI bus doesn't support hotplug\n");
  52        return NULL;
  53    }
  54
  55    opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
  56    if (!opts) {
  57        return NULL;
  58    }
  59
  60    qemu_opt_set(opts, "type", "nic");
  61
  62    ret = net_client_init(mon, opts, 0);
  63    if (ret < 0)
  64        return NULL;
  65    if (nd_table[ret].devaddr) {
  66        monitor_printf(mon, "Parameter addr not supported\n");
  67        return NULL;
  68    }
  69    return pci_nic_init(&nd_table[ret], "rtl8139", devaddr);
  70}
  71
  72static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
  73                        DriveInfo *dinfo, int printinfo)
  74{
  75    SCSIBus *scsibus;
  76    SCSIDevice *scsidev;
  77
  78    scsibus = DO_UPCAST(SCSIBus, qbus, QLIST_FIRST(&adapter->child_bus));
  79    if (!scsibus || strcmp(scsibus->qbus.info->name, "SCSI") != 0) {
  80        error_report("Device is not a SCSI adapter");
  81        return -1;
  82    }
  83
  84    /*
  85     * drive_init() tries to find a default for dinfo->unit.  Doesn't
  86     * work at all for hotplug though as we assign the device to a
  87     * specific bus instead of the first bus with spare scsi ids.
  88     *
  89     * Ditch the calculated value and reload from option string (if
  90     * specified).
  91     */
  92    dinfo->unit = qemu_opt_get_number(dinfo->opts, "unit", -1);
  93    dinfo->bus = scsibus->busnr;
  94    scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo->bdrv, dinfo->unit, false);
  95    if (!scsidev) {
  96        return -1;
  97    }
  98    dinfo->unit = scsidev->id;
  99
 100    if (printinfo)
 101        monitor_printf(mon, "OK bus %d, unit %d\n",
 102                       scsibus->busnr, scsidev->id);
 103    return 0;
 104}
 105
 106void drive_hot_add(Monitor *mon, const QDict *qdict)
 107{
 108    int dom, pci_bus;
 109    unsigned slot;
 110    int type;
 111    PCIDevice *dev;
 112    DriveInfo *dinfo = NULL;
 113    const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 114    const char *opts = qdict_get_str(qdict, "opts");
 115
 116    dinfo = add_init_drive(opts);
 117    if (!dinfo)
 118        goto err;
 119    if (dinfo->devaddr) {
 120        monitor_printf(mon, "Parameter addr not supported\n");
 121        goto err;
 122    }
 123    type = dinfo->type;
 124
 125    switch (type) {
 126    case IF_SCSI:
 127        if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
 128            goto err;
 129        }
 130        dev = pci_find_device(pci_find_root_bus(dom), pci_bus,
 131                              PCI_DEVFN(slot, 0));
 132        if (!dev) {
 133            monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 134            goto err;
 135        }
 136        if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 137            goto err;
 138        }
 139        break;
 140    case IF_NONE:
 141        monitor_printf(mon, "OK\n");
 142        break;
 143    default:
 144        monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
 145        goto err;
 146    }
 147    return;
 148
 149err:
 150    if (dinfo)
 151        drive_put_ref(dinfo);
 152    return;
 153}
 154
 155static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 156                                           const char *devaddr,
 157                                           const char *opts)
 158{
 159    PCIDevice *dev;
 160    DriveInfo *dinfo = NULL;
 161    int type = -1;
 162    char buf[128];
 163    PCIBus *bus;
 164    int devfn;
 165
 166    if (get_param_value(buf, sizeof(buf), "if", opts)) {
 167        if (!strcmp(buf, "scsi"))
 168            type = IF_SCSI;
 169        else if (!strcmp(buf, "virtio")) {
 170            type = IF_VIRTIO;
 171        } else {
 172            monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 173            return NULL;
 174        }
 175    } else {
 176        monitor_printf(mon, "no if= specified\n");
 177        return NULL;
 178    }
 179
 180    if (get_param_value(buf, sizeof(buf), "file", opts)) {
 181        dinfo = add_init_drive(opts);
 182        if (!dinfo)
 183            return NULL;
 184        if (dinfo->devaddr) {
 185            monitor_printf(mon, "Parameter addr not supported\n");
 186            return NULL;
 187        }
 188    } else {
 189        dinfo = NULL;
 190    }
 191
 192    bus = pci_get_bus_devfn(&devfn, devaddr);
 193    if (!bus) {
 194        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 195        return NULL;
 196    }
 197    if (!((BusState*)bus)->allow_hotplug) {
 198        monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 199        return NULL;
 200    }
 201
 202    switch (type) {
 203    case IF_SCSI:
 204        dev = pci_create(bus, devfn, "lsi53c895a");
 205        if (qdev_init(&dev->qdev) < 0)
 206            dev = NULL;
 207        if (dev && dinfo) {
 208            if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 209                qdev_unplug(&dev->qdev);
 210                dev = NULL;
 211            }
 212        }
 213        break;
 214    case IF_VIRTIO:
 215        if (!dinfo) {
 216            monitor_printf(mon, "virtio requires a backing file/device.\n");
 217            return NULL;
 218        }
 219        dev = pci_create(bus, devfn, "virtio-blk-pci");
 220        if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 221            qdev_free(&dev->qdev);
 222            dev = NULL;
 223            break;
 224        }
 225        if (qdev_init(&dev->qdev) < 0)
 226            dev = NULL;
 227        break;
 228    default:
 229        dev = NULL;
 230    }
 231    return dev;
 232}
 233
 234void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 235{
 236    PCIDevice *dev = NULL;
 237    const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 238    const char *type = qdict_get_str(qdict, "type");
 239    const char *opts = qdict_get_try_str(qdict, "opts");
 240
 241    /* strip legacy tag */
 242    if (!strncmp(pci_addr, "pci_addr=", 9)) {
 243        pci_addr += 9;
 244    }
 245
 246    if (!opts) {
 247        opts = "";
 248    }
 249
 250    if (!strcmp(pci_addr, "auto"))
 251        pci_addr = NULL;
 252
 253    if (strcmp(type, "nic") == 0) {
 254        dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 255    } else if (strcmp(type, "storage") == 0) {
 256        dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 257    } else {
 258        monitor_printf(mon, "invalid type: %s\n", type);
 259    }
 260
 261    if (dev) {
 262        monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 263                       pci_find_domain(dev->bus),
 264                       pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
 265                       PCI_FUNC(dev->devfn));
 266    } else
 267        monitor_printf(mon, "failed to add %s\n", opts);
 268}
 269#endif
 270
 271static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 272{
 273    PCIDevice *d;
 274    int dom, bus;
 275    unsigned slot;
 276
 277    if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 278        return -1;
 279    }
 280
 281    d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));
 282    if (!d) {
 283        monitor_printf(mon, "slot %d empty\n", slot);
 284        return -1;
 285    }
 286    return qdev_unplug(&d->qdev);
 287}
 288
 289void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)
 290{
 291    pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 292}
 293