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 "sysemu.h"
  30 #include "pc.h"
  31 #include "monitor.h"
  32 #include "block_int.h"
  33 #include "scsi.h"
  34 #include "virtio-blk.h"
  35 #include "qemu-config.h"
  36 #include "qemu-objects.h"
  37
  38 #if defined(TARGET_I386)
  39 static PCIDevice *qemu_pci_hot_add_nic(Monitor *mon,
  40                                        const char *devaddr,
  41                                        const char *opts_str)
  42 {
  43     QemuOpts *opts;
  44     PCIBus *bus;
  45     int ret, devfn;
  46
  47     bus = pci_get_bus_devfn(&devfn, devaddr);
  48     if (!bus) {
  49         monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
  50         return NULL;
  51     }
  52     if (!((BusState*)bus)->allow_hotplug) {
  53         monitor_printf(mon, "PCI bus doesn't support hotplug\n");
  54         return NULL;
  55     }
  56
  57     opts = qemu_opts_parse(&qemu_net_opts, opts_str ? opts_str : "", 0);
  58     if (!opts) {
  59         return NULL;
  60     }
  61
  62     qemu_opt_set(opts, "type", "nic");
  63
  64     ret = net_client_init(mon, opts, 0);
  65     if (ret < 0)
  66         return NULL;
  67     if (nd_table[ret].devaddr) {
  68         monitor_printf(mon, "Parameter addr not supported\n");
  69         return NULL;
  70     }
  71     return pci_nic_init(&nd_table[ret], "rtl8139", devaddr);
  72 }
  73
  74 static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
  75                         DriveInfo *dinfo, int printinfo)
  76 {
  77     SCSIBus *scsibus;
  78     SCSIDevice *scsidev;
  79
  80     scsibus = DO_UPCAST(SCSIBus, qbus, QLIST_FIRST(&adapter->child_bus));
  81     if (!scsibus || strcmp(scsibus->qbus.info->name, "SCSI") != 0) {
  82         error_report("Device is not a SCSI adapter");
  83         return -1;
  84     }
  85
  86     /*
  87      * drive_init() tries to find a default for dinfo->unit.  Doesn't
  88      * work at all for hotplug though as we assign the device to a
  89      * specific bus instead of the first bus with spare scsi ids.
  90      *
  91      * Ditch the calculated value and reload from option string (if
  92      * specified).
  93      */
  94     dinfo->unit = qemu_opt_get_number(dinfo->opts, "unit", -1);
  95     scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo, dinfo->unit);
  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
 104 void drive_hot_add(Monitor *mon, const QDict *qdict)
 105 {
 106     int dom, pci_bus;
 107     unsigned slot;
 108     int type, bus;
 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     bus = drive_get_max_bus (type);
 123
 124     switch (type) {
 125     case IF_SCSI:
 126         if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
 127             goto err;
 128         }
 129         dev = pci_find_device(pci_find_root_bus(0), pci_bus, slot, 0);
 130         if (!dev) {
 131             monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 132             goto err;
 133         }
 134         if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 135             goto err;
 136         }
 137         break;
 138     case IF_NONE:
 139         monitor_printf(mon, "OK\n");
 140         break;
 141     default:
 142         monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
 143         goto err;
 144     }
 145     return;
 146
 147 err:
 148     if (dinfo)
 149         drive_uninit(dinfo);
 150     return;
 151 }
 152
 153 static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 154                                            const char *devaddr,
 155                                            const char *opts)
 156 {
 157     PCIDevice *dev;
 158     DriveInfo *dinfo = NULL;
 159     int type = -1;
 160     char buf[128];
 161     PCIBus *bus;
 162     int devfn;
 163
 164     if (get_param_value(buf, sizeof(buf), "if", opts)) {
 165         if (!strcmp(buf, "scsi"))
 166             type = IF_SCSI;
 167         else if (!strcmp(buf, "virtio")) {
 168             type = IF_VIRTIO;
 169         } else {
 170             monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 171             return NULL;
 172         }
 173     } else {
 174         monitor_printf(mon, "no if= specified\n");
 175         return NULL;
 176     }
 177
 178     if (get_param_value(buf, sizeof(buf), "file", opts)) {
 179         dinfo = add_init_drive(opts);
 180         if (!dinfo)
 181             return NULL;
 182         if (dinfo->devaddr) {
 183             monitor_printf(mon, "Parameter addr not supported\n");
 184             return NULL;
 185         }
 186     } else {
 187         dinfo = NULL;
 188     }
 189
 190     bus = pci_get_bus_devfn(&devfn, devaddr);
 191     if (!bus) {
 192         monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 193         return NULL;
 194     }
 195     if (!((BusState*)bus)->allow_hotplug) {
 196         monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 197         return NULL;
 198     }
 199
 200     switch (type) {
 201     case IF_SCSI:
 202         dev = pci_create(bus, devfn, "lsi53c895a");
 203         if (qdev_init(&dev->qdev) < 0)
 204             dev = NULL;
 205         if (dev && dinfo) {
 206             if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 207                 qdev_unplug(&dev->qdev);
 208                 dev = NULL;
 209             }
 210         }
 211         break;
 212     case IF_VIRTIO:
 213         if (!dinfo) {
 214             monitor_printf(mon, "virtio requires a backing file/device.\n");
 215             return NULL;
 216         }
 217         dev = pci_create(bus, devfn, "virtio-blk-pci");
 218         qdev_prop_set_drive(&dev->qdev, "drive", dinfo);
 219         if (qdev_init(&dev->qdev) < 0)
 220             dev = NULL;
 221         break;
 222     default:
 223         dev = NULL;
 224     }
 225     return dev;
 226 }
 227
 228 void pci_device_hot_add_print(Monitor *mon, const QObject *data)
 229 {
 230     QDict *qdict;
 231
 232     assert(qobject_type(data) == QTYPE_QDICT);
 233     qdict = qobject_to_qdict(data);
 234
 235     monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 236                    (int) qdict_get_int(qdict, "domain"),
 237                    (int) qdict_get_int(qdict, "bus"),
 238                    (int) qdict_get_int(qdict, "slot"),
 239                    (int) qdict_get_int(qdict, "function"));
 240
 241 }
 242
 243 /**
 244  * pci_device_hot_add(): Hot add a PCI device
 245  *
 246  * Return a QDict with the following device information:
 247  *
 248  * - "domain": domain number
 249  * - "bus": bus number
 250  * - "slot": slot number
 251  * - "function": function number
 252  *
 253  * Example:
 254  *
 255  * { "domain": 0, "bus": 0, "slot": 5, "function": 0 }
 256  */
 257 int pci_device_hot_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
 258 {
 259     PCIDevice *dev = NULL;
 260     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 261     const char *type = qdict_get_str(qdict, "type");
 262     const char *opts = qdict_get_try_str(qdict, "opts");
 263
 264     /* strip legacy tag */
 265     if (!strncmp(pci_addr, "pci_addr=", 9)) {
 266         pci_addr += 9;
 267     }
 268
 269     if (!opts) {
 270         opts = "";
 271     }
 272
 273     if (!strcmp(pci_addr, "auto"))
 274         pci_addr = NULL;
 275
 276     if (strcmp(type, "nic") == 0) {
 277         dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 278     } else if (strcmp(type, "storage") == 0) {
 279         dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 280     } else {
 281         monitor_printf(mon, "invalid type: %s\n", type);
 282         return -1;
 283     }
 284
 285     if (dev) {
 286         *ret_data =
 287         qobject_from_jsonf("{ 'domain': 0, 'bus': %d, 'slot': %d, "
 288                            "'function': %d }", pci_bus_num(dev->bus),
 289                            PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 290     } else {
 291         monitor_printf(mon, "failed to add %s\n", opts);
 292         return -1;
 293     }
 294
 295     return 0;
 296 }
 297 #endif
 298
 299 int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 300 {
 301     PCIDevice *d;
 302     int dom, bus;
 303     unsigned slot;
 304
 305     if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 306         return -1;
 307     }
 308
 309     d = pci_find_device(pci_find_root_bus(0), bus, slot, 0);
 310     if (!d) {
 311         monitor_printf(mon, "slot %d empty\n", slot);
 312         return -1;
 313     }
 314     return qdev_unplug(&d->qdev);
 315 }
 316
 317 int do_pci_device_hot_remove(Monitor *mon, const QDict *qdict,
 318                              QObject **ret_data)
 319 {
 320     return pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 321 }