hw/pci/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/hw.h"
  26 #include "hw/boards.h"
  27 #include "hw/pci/pci.h"
  28 #include "net/net.h"
  29 #include "hw/i386/pc.h"
  30 #include "monitor/monitor.h"
  31 #include "hw/scsi/scsi.h"
  32 #include "hw/virtio/virtio-blk.h"
  33 #include "qemu/config-file.h"
  34 #include "sysemu/blockdev.h"
  35 #include "qapi/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, NULL);
 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, DriveInfo *dinfo)
 115 {
 116     int dom, pci_bus;
 117     unsigned slot;
 118     PCIDevice *dev;
 119     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 120
 121     switch (dinfo->type) {
 122     case IF_SCSI:
 123         if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
 124             goto err;
 125         }
 126         dev = pci_find_device(pci_find_root_bus(dom), pci_bus,
 127                               PCI_DEVFN(slot, 0));
 128         if (!dev) {
 129             monitor_printf(mon, "no pci device with address %s\n", pci_addr);
 130             goto err;
 131         }
 132         if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {
 133             goto err;
 134         }
 135         break;
 136     default:
 137         monitor_printf(mon, "Can't hot-add drive to type %d\n", dinfo->type);
 138         goto err;
 139     }
 140
 141     return 0;
 142 err:
 143     return -1;
 144 }
 145
 146 static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 147                                            const char *devaddr,
 148                                            const char *opts)
 149 {
 150     PCIDevice *dev;
 151     DriveInfo *dinfo = NULL;
 152     int type = -1;
 153     char buf[128];
 154     PCIBus *bus;
 155     int devfn;
 156
 157     if (get_param_value(buf, sizeof(buf), "if", opts)) {
 158         if (!strcmp(buf, "scsi"))
 159             type = IF_SCSI;
 160         else if (!strcmp(buf, "virtio")) {
 161             type = IF_VIRTIO;
 162         } else {
 163             monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);
 164             return NULL;
 165         }
 166     } else {
 167         monitor_printf(mon, "no if= specified\n");
 168         return NULL;
 169     }
 170
 171     if (get_param_value(buf, sizeof(buf), "file", opts)) {
 172         dinfo = add_init_drive(opts);
 173         if (!dinfo)
 174             return NULL;
 175         if (dinfo->devaddr) {
 176             monitor_printf(mon, "Parameter addr not supported\n");
 177             return NULL;
 178         }
 179     } else {
 180         dinfo = NULL;
 181     }
 182
 183     bus = pci_get_bus_devfn(&devfn, devaddr);
 184     if (!bus) {
 185         monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);
 186         return NULL;
 187     }
 188     if (!((BusState*)bus)->allow_hotplug) {
 189         monitor_printf(mon, "PCI bus doesn't support hotplug\n");
 190         return NULL;
 191     }
 192
 193     switch (type) {
 194     case IF_SCSI:
 195         dev = pci_create(bus, devfn, "lsi53c895a");
 196         if (qdev_init(&dev->qdev) < 0)
 197             dev = NULL;
 198         if (dev && dinfo) {
 199             if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {
 200                 qdev_unplug(&dev->qdev, NULL);
 201                 dev = NULL;
 202             }
 203         }
 204         break;
 205     case IF_VIRTIO:
 206         if (!dinfo) {
 207             monitor_printf(mon, "virtio requires a backing file/device.\n");
 208             return NULL;
 209         }
 210         dev = pci_create(bus, devfn, "virtio-blk-pci");
 211         if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 212             qdev_free(&dev->qdev);
 213             dev = NULL;
 214             break;
 215         }
 216         if (qdev_init(&dev->qdev) < 0)
 217             dev = NULL;
 218         break;
 219     default:
 220         dev = NULL;
 221     }
 222     return dev;
 223 }
 224
 225 void pci_device_hot_add(Monitor *mon, const QDict *qdict)
 226 {
 227     PCIDevice *dev = NULL;
 228     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
 229     const char *type = qdict_get_str(qdict, "type");
 230     const char *opts = qdict_get_try_str(qdict, "opts");
 231
 232     /* strip legacy tag */
 233     if (!strncmp(pci_addr, "pci_addr=", 9)) {
 234         pci_addr += 9;
 235     }
 236
 237     if (!opts) {
 238         opts = "";
 239     }
 240
 241     if (!strcmp(pci_addr, "auto"))
 242         pci_addr = NULL;
 243
 244     if (strcmp(type, "nic") == 0) {
 245         dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);
 246     } else if (strcmp(type, "storage") == 0) {
 247         dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);
 248     } else {
 249         monitor_printf(mon, "invalid type: %s\n", type);
 250     }
 251
 252     if (dev) {
 253         monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
 254                        pci_find_domain(dev->bus),
 255                        pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
 256                        PCI_FUNC(dev->devfn));
 257     } else
 258         monitor_printf(mon, "failed to add %s\n", opts);
 259 }
 260 #endif
 261
 262 static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
 263 {
 264     PCIDevice *d;
 265     int dom, bus;
 266     unsigned slot;
 267     Error *local_err = NULL;
 268
 269     if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {
 270         return -1;
 271     }
 272
 273     d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));
 274     if (!d) {
 275         monitor_printf(mon, "slot %d empty\n", slot);
 276         return -1;
 277     }
 278
 279     qdev_unplug(&d->qdev, &local_err);
 280     if (error_is_set(&local_err)) {
 281         monitor_printf(mon, "%s\n", error_get_pretty(local_err));
 282         error_free(local_err);
 283         return -1;
 284     }
 285
 286     return 0;
 287 }
 288
 289 void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)
 290 {
 291     pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));
 292 }