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