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, 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
 106 void 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
 149 err:
 150     if (dinfo)
 151         drive_put_ref(dinfo);
 152     return;
 153 }
 154
 155 static 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
 234 void 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
 271 static 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
 289 void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)
 290 {
 291     pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 292 }