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)
  37 static 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
  72 static 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,
  95                                         false, -1);
  96     if (!scsidev) {
  97         return -1;
  98     }
  99     dinfo->unit = scsidev->id;
 100
 101     if (printinfo)
 102         monitor_printf(mon, "OK bus %d, unit %d\n",
 103                        scsibus->busnr, scsidev->id);
 104     return 0;
 105 }
 106
 107 int pci_drive_hot_add(Monitor *mon, const QDict *qdict,
 108                       DriveInfo *dinfo, int type)
 109 {
 110     int dom, pci_bus;
 111     unsigned slot;
 112     PCIDevice *dev;
 113     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 114
 115     switch (type) {
 116     case IF_SCSI:
 117         if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
 118             goto err;
 119         }
 120         dev = pci_find_device(pci_find_root_bus(dom), pci_bus,
 121                               PCI_DEVFN(slot, 0));
 122         if (!dev) {
 123             monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 124             goto err;
 125         }
 126         if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 127             goto err;
 128         }
 129         break;
 130     default:
 131         monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
 132         goto err;
 133     }
 134
 135     return 0;
 136 err:
 137     return -1;
 138 }
 139
 140 static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 141                                            const char *devaddr,
 142                                            const char *opts)
 143 {
 144     PCIDevice *dev;
 145     DriveInfo *dinfo = NULL;
 146     int type = -1;
 147     char buf[128];
 148     PCIBus *bus;
 149     int devfn;
 150
 151     if (get_param_value(buf, sizeof(buf), "if", opts)) {
 152         if (!strcmp(buf, "scsi"))
 153             type = IF_SCSI;
 154         else if (!strcmp(buf, "virtio")) {
 155             type = IF_VIRTIO;
 156         } else {
 157             monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 158             return NULL;
 159         }
 160     } else {
 161         monitor_printf(mon, "no if= specified\n");
 162         return NULL;
 163     }
 164
 165     if (get_param_value(buf, sizeof(buf), "file", opts)) {
 166         dinfo = add_init_drive(opts);
 167         if (!dinfo)
 168             return NULL;
 169         if (dinfo->devaddr) {
 170             monitor_printf(mon, "Parameter addr not supported\n");
 171             return NULL;
 172         }
 173     } else {
 174         dinfo = NULL;
 175     }
 176
 177     bus = pci_get_bus_devfn(&devfn, devaddr);
 178     if (!bus) {
 179         monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 180         return NULL;
 181     }
 182     if (!((BusState*)bus)->allow_hotplug) {
 183         monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 184         return NULL;
 185     }
 186
 187     switch (type) {
 188     case IF_SCSI:
 189         dev = pci_create(bus, devfn, "lsi53c895a");
 190         if (qdev_init(&dev->qdev) < 0)
 191             dev = NULL;
 192         if (dev && dinfo) {
 193             if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 194                 qdev_unplug(&dev->qdev);
 195                 dev = NULL;
 196             }
 197         }
 198         break;
 199     case IF_VIRTIO:
 200         if (!dinfo) {
 201             monitor_printf(mon, "virtio requires a backing file/device.\n");
 202             return NULL;
 203         }
 204         dev = pci_create(bus, devfn, "virtio-blk-pci");
 205         if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 206             qdev_free(&dev->qdev);
 207             dev = NULL;
 208             break;
 209         }
 210         if (qdev_init(&dev->qdev) < 0)
 211             dev = NULL;
 212         break;
 213     default:
 214         dev = NULL;
 215     }
 216     return dev;
 217 }
 218
 219 void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 220 {
 221     PCIDevice *dev = NULL;
 222     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 223     const char *type = qdict_get_str(qdict, "type");
 224     const char *opts = qdict_get_try_str(qdict, "opts");
 225
 226     /* strip legacy tag */
 227     if (!strncmp(pci_addr, "pci_addr=", 9)) {
 228         pci_addr += 9;
 229     }
 230
 231     if (!opts) {
 232         opts = "";
 233     }
 234
 235     if (!strcmp(pci_addr, "auto"))
 236         pci_addr = NULL;
 237
 238     if (strcmp(type, "nic") == 0) {
 239         dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 240     } else if (strcmp(type, "storage") == 0) {
 241         dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 242     } else {
 243         monitor_printf(mon, "invalid type: %s\n", type);
 244     }
 245
 246     if (dev) {
 247         monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 248                        pci_find_domain(dev->bus),
 249                        pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
 250                        PCI_FUNC(dev->devfn));
 251     } else
 252         monitor_printf(mon, "failed to add %s\n", opts);
 253 }
 254 #endif
 255
 256 static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 257 {
 258     PCIDevice *d;
 259     int dom, bus;
 260     unsigned slot;
 261
 262     if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 263         return -1;
 264     }
 265
 266     d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));
 267     if (!d) {
 268         monitor_printf(mon, "slot %d empty\n", slot);
 269         return -1;
 270     }
 271     return qdev_unplug(&d->qdev);
 272 }
 273
 274 void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)
 275 {
 276     pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 277 }