Archipelago » qemu

/*

 * QEMU PCI hotplug support

 *

 * Copyright (c) 2004 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "boards.h"

#include "pci.h"

#include "net.h"

#include "pc.h"

#include "monitor.h"

#include "scsi.h"

#include "virtio-blk.h"

#include "qemu-config.h"

#include "blockdev.h"

#if defined(TARGET_I386)

static PCIDevice *qemu_pci_hot_add_nic(Monitor *mon,

                                       const char *devaddr,

                                       const char *opts_str)

{

    QemuOpts *opts;

    PCIBus *bus;

    int ret, devfn;

    bus = pci_get_bus_devfn(&devfn, devaddr);

    if (!bus) {

        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);

        return NULL;

    }

    if (!((BusState*)bus)->allow_hotplug) {

        monitor_printf(mon, "PCI bus doesn't support hotplug\n");

        return NULL;

    }

    opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);

    if (!opts) {

        return NULL;

    }

    qemu_opt_set(opts, "type", "nic");

    ret = net_client_init(mon, opts, 0);

    if (ret < 0)

        return NULL;

    if (nd_table[ret].devaddr) {

        monitor_printf(mon, "Parameter addr not supported\n");

        return NULL;

    }

    return pci_nic_init(&nd_table[ret], "rtl8139", devaddr);

}

static int scsi_hot_add(Monitor *mon, DeviceState *adapter,

                        DriveInfo *dinfo, int printinfo)

{

    SCSIBus *scsibus;

    SCSIDevice *scsidev;

    scsibus = DO_UPCAST(SCSIBus, qbus, QLIST_FIRST(&adapter->child_bus));

    if (!scsibus || strcmp(scsibus->qbus.info->name, "SCSI") != 0) {

        error_report("Device is not a SCSI adapter");

        return -1;

    }

    /*

     * drive_init() tries to find a default for dinfo->unit.  Doesn't

     * work at all for hotplug though as we assign the device to a

     * specific bus instead of the first bus with spare scsi ids.

     *

     * Ditch the calculated value and reload from option string (if

     * specified).

     */

    dinfo->unit = qemu_opt_get_number(dinfo->opts, "unit", -1);

    dinfo->bus = scsibus->busnr;

    scsidev = scsi_bus_legacy_add_drive(scsibus, dinfo->bdrv, dinfo->unit, false);

    if (!scsidev) {

        return -1;

    }

    dinfo->unit = scsidev->id;

    if (printinfo)

        monitor_printf(mon, "OK bus %d, unit %d\n",

                       scsibus->busnr, scsidev->id);

    return 0;

}

void drive_hot_add(Monitor *mon, const QDict *qdict)

{

    int dom, pci_bus;

    unsigned slot;

    int type;

    PCIDevice *dev;

    DriveInfo *dinfo = NULL;

    const char *pci_addr = qdict_get_str(qdict, "pci_addr");

    const char *opts = qdict_get_str(qdict, "opts");

    dinfo = add_init_drive(opts);

    if (!dinfo)

        goto err;

    if (dinfo->devaddr) {

        monitor_printf(mon, "Parameter addr not supported\n");

        goto err;

    }

    type = dinfo->type;

    switch (type) {

    case IF_SCSI:

        if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {

            goto err;

        }

        dev = pci_find_device(pci_find_root_bus(dom), pci_bus,

                              PCI_DEVFN(slot, 0));

        if (!dev) {

            monitor_printf(mon, "no pci device with address %s\n", pci_addr);

            goto err;

        }

        if (scsi_hot_add(mon, &dev->qdev, dinfo, 1) != 0) {

            goto err;

        }

        break;

    case IF_NONE:

        monitor_printf(mon, "OK\n");

        break;

    default:

        monitor_printf(mon, "Can't hot-add drive to type %d\n", type);

        goto err;

    }

    return;

err:

    if (dinfo)

        drive_put_ref(dinfo);

    return;

}

static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,

                                           const char *devaddr,

                                           const char *opts)

{

    PCIDevice *dev;

    DriveInfo *dinfo = NULL;

    int type = -1;

    char buf[128];

    PCIBus *bus;

    int devfn;

    if (get_param_value(buf, sizeof(buf), "if", opts)) {

        if (!strcmp(buf, "scsi"))

            type = IF_SCSI;

        else if (!strcmp(buf, "virtio")) {

            type = IF_VIRTIO;

        } else {

            monitor_printf(mon, "type %s not a hotpluggable PCI device.\n", buf);

            return NULL;

        }

    } else {

        monitor_printf(mon, "no if= specified\n");

        return NULL;

    }

    if (get_param_value(buf, sizeof(buf), "file", opts)) {

        dinfo = add_init_drive(opts);

        if (!dinfo)

            return NULL;

        if (dinfo->devaddr) {

            monitor_printf(mon, "Parameter addr not supported\n");

            return NULL;

        }

    } else {

        dinfo = NULL;

    }

    bus = pci_get_bus_devfn(&devfn, devaddr);

    if (!bus) {

        monitor_printf(mon, "Invalid PCI device address %s\n", devaddr);

        return NULL;

    }

    if (!((BusState*)bus)->allow_hotplug) {

        monitor_printf(mon, "PCI bus doesn't support hotplug\n");

        return NULL;

    }

    switch (type) {

    case IF_SCSI:

        dev = pci_create(bus, devfn, "lsi53c895a");

        if (qdev_init(&dev->qdev) < 0)

            dev = NULL;

        if (dev && dinfo) {

            if (scsi_hot_add(mon, &dev->qdev, dinfo, 0) != 0) {

                qdev_unplug(&dev->qdev);

                dev = NULL;

            }

        }

        break;

    case IF_VIRTIO:

        if (!dinfo) {

            monitor_printf(mon, "virtio requires a backing file/device.\n");

            return NULL;

        }

        dev = pci_create(bus, devfn, "virtio-blk-pci");

        if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {

            qdev_free(&dev->qdev);

            dev = NULL;

            break;

        }

        if (qdev_init(&dev->qdev) < 0)

            dev = NULL;

        break;

    default:

        dev = NULL;

    }

    return dev;

}

void pci_device_hot_add(Monitor *mon, const QDict *qdict)

{

    PCIDevice *dev = NULL;

    const char *pci_addr = qdict_get_str(qdict, "pci_addr");

    const char *type = qdict_get_str(qdict, "type");

    const char *opts = qdict_get_try_str(qdict, "opts");

    /* strip legacy tag */

    if (!strncmp(pci_addr, "pci_addr=", 9)) {

        pci_addr += 9;

    }

    if (!opts) {

        opts = "";

    }

    if (!strcmp(pci_addr, "auto"))

        pci_addr = NULL;

    if (strcmp(type, "nic") == 0) {

        dev = qemu_pci_hot_add_nic(mon, pci_addr, opts);

    } else if (strcmp(type, "storage") == 0) {

        dev = qemu_pci_hot_add_storage(mon, pci_addr, opts);

    } else {

        monitor_printf(mon, "invalid type: %s\n", type);

    }

    if (dev) {

        monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",

                       pci_find_domain(dev->bus),

                       pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),

                       PCI_FUNC(dev->devfn));

    } else

        monitor_printf(mon, "failed to add %s\n", opts);

}

#endif

static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)

{

    PCIDevice *d;

    int dom, bus;

    unsigned slot;

    if (pci_read_devaddr(mon, pci_addr, &dom, &bus, &slot)) {

        return -1;

    }

    d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));

    if (!d) {

        monitor_printf(mon, "slot %d empty\n", slot);

        return -1;

    }

    return qdev_unplug(&d->qdev);

}

void do_pci_device_hot_remove(Monitor *mon, const QDict *qdict)

{

    pci_device_hot_remove(mon, qdict_get_str(qdict, "pci_addr"));

}