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, slot, 0);
 131         if (!dev) {
 132             monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 133             goto err;
 134         }
 135         if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 136             goto err;
 137         }
 138         break;
 139     case IF_NONE:
 140         monitor_printf(mon, "OK\n");
 141         break;
 142     default:
 143         monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
 144         goto err;
 145     }
 146     return;
 147
 148 err:
 149     if (dinfo)
 150         drive_put_ref(dinfo);
 151     return;
 152 }
 153
 154 static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 155                                            const char *devaddr,
 156                                            const char *opts)
 157 {
 158     PCIDevice *dev;
 159     DriveInfo *dinfo = NULL;
 160     int type = -1;
 161     char buf[128];
 162     PCIBus *bus;
 163     int devfn;
 164
 165     if (get_param_value(buf, sizeof(buf), "if", opts)) {
 166         if (!strcmp(buf, "scsi"))
 167             type = IF_SCSI;
 168         else if (!strcmp(buf, "virtio")) {
 169             type = IF_VIRTIO;
 170         } else {
 171             monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 172             return NULL;
 173         }
 174     } else {
 175         monitor_printf(mon, "no if= specified\n");
 176         return NULL;
 177     }
 178
 179     if (get_param_value(buf, sizeof(buf), "file", opts)) {
 180         dinfo = add_init_drive(opts);
 181         if (!dinfo)
 182             return NULL;
 183         if (dinfo->devaddr) {
 184             monitor_printf(mon, "Parameter addr not supported\n");
 185             return NULL;
 186         }
 187     } else {
 188         dinfo = NULL;
 189     }
 190
 191     bus = pci_get_bus_devfn(&devfn, devaddr);
 192     if (!bus) {
 193         monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 194         return NULL;
 195     }
 196     if (!((BusState*)bus)->allow_hotplug) {
 197         monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 198         return NULL;
 199     }
 200
 201     switch (type) {
 202     case IF_SCSI:
 203         dev = pci_create(bus, devfn, "lsi53c895a");
 204         if (qdev_init(&dev->qdev) < 0)
 205             dev = NULL;
 206         if (dev && dinfo) {
 207             if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 208                 qdev_unplug(&dev->qdev);
 209                 dev = NULL;
 210             }
 211         }
 212         break;
 213     case IF_VIRTIO:
 214         if (!dinfo) {
 215             monitor_printf(mon, "virtio requires a backing file/device.\n");
 216             return NULL;
 217         }
 218         dev = pci_create(bus, devfn, "virtio-blk-pci");
 219         if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 220             qdev_free(&dev->qdev);
 221             dev = NULL;
 222             break;
 223         }
 224         if (qdev_init(&dev->qdev) < 0)
 225             dev = NULL;
 226         break;
 227     default:
 228         dev = NULL;
 229     }
 230     return dev;
 231 }
 232
 233 void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 234 {
 235     PCIDevice *dev = NULL;
 236     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 237     const char *type = qdict_get_str(qdict, "type");
 238     const char *opts = qdict_get_try_str(qdict, "opts");
 239
 240     /* strip legacy tag */
 241     if (!strncmp(pci_addr, "pci_addr=", 9)) {
 242         pci_addr += 9;
 243     }
 244
 245     if (!opts) {
 246         opts = "";
 247     }
 248
 249     if (!strcmp(pci_addr, "auto"))
 250         pci_addr = NULL;
 251
 252     if (strcmp(type, "nic") == 0) {
 253         dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 254     } else if (strcmp(type, "storage") == 0) {
 255         dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 256     } else {
 257         monitor_printf(mon, "invalid type: %s\n", type);
 258     }
 259
 260     if (dev) {
 261         monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 262                        pci_find_domain(dev->bus),
 263                        pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
 264                        PCI_FUNC(dev->devfn));
 265     } else
 266         monitor_printf(mon, "failed to add %s\n", opts);
 267 }
 268 #endif
 269
 270 static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 271 {
 272     PCIDevice *d;
 273     int dom, bus;
 274     unsigned slot;
 275
 276     if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 277         return -1;
 278     }
 279
 280     d = pci_find_device(pci_find_root_bus(dom), bus, slot, 0);
 281     if (!d) {
 282         monitor_printf(mon, "slot %d empty\n", slot);
 283         return -1;
 284     }
 285     return qdev_unplug(&d->qdev);
 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 }