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