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