Archipelago » qemu

/*

 * qdev property parsing and global properties

 * (parts specific for qemu-system-*)

 *

 * This file is based on code from hw/qdev-properties.c from

 * commit 074a86fccd185616469dfcdc0e157f438aebba18,

 * Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 */

#include "net/net.h"

#include "hw/qdev.h"

#include "qapi/qmp/qerror.h"

#include "sysemu/blockdev.h"

#include "hw/block/block.h"

#include "net/hub.h"

#include "qapi/visitor.h"

#include "sysemu/char.h"

static void get_pointer(Object *obj, Visitor *v, Property *prop,

                        const char *(*print)(void *ptr),

                        const char *name, Error **errp)

{

    DeviceState *dev = DEVICE(obj);

    void **ptr = qdev_get_prop_ptr(dev, prop);

    char *p;

    p = (char *) (*ptr ? print(*ptr) : "");

    visit_type_str(v, &p, name, errp);

}

static void set_pointer(Object *obj, Visitor *v, Property *prop,

                        int (*parse)(DeviceState *dev, const char *str,

                                     void **ptr),

                        const char *name, Error **errp)

{

    DeviceState *dev = DEVICE(obj);

    Error *local_err = NULL;

    void **ptr = qdev_get_prop_ptr(dev, prop);

    char *str;

    int ret;

    if (dev->realized) {

        qdev_prop_set_after_realize(dev, name, errp);

        return;

    }

    visit_type_str(v, &str, name, &local_err);

    if (local_err) {

        error_propagate(errp, local_err);

        return;

    }

    if (!*str) {

        g_free(str);

        *ptr = NULL;

        return;

    }

    ret = parse(dev, str, ptr);

    error_set_from_qdev_prop_error(errp, ret, dev, prop, str);

    g_free(str);

}

/* --- drive --- */

static int parse_drive(DeviceState *dev, const char *str, void **ptr)

{

    BlockDriverState *bs;

    bs = bdrv_find(str);

    if (bs == NULL) {

        return -ENOENT;

    }

    if (bdrv_attach_dev(bs, dev) < 0) {

        return -EEXIST;

    }

    *ptr = bs;

    return 0;

}

static void release_drive(Object *obj, const char *name, void *opaque)

{

    DeviceState *dev = DEVICE(obj);

    Property *prop = opaque;

    BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);

    if (*ptr) {

        bdrv_detach_dev(*ptr, dev);

        blockdev_auto_del(*ptr);

    }

}

static const char *print_drive(void *ptr)

{

    return bdrv_get_device_name(ptr);

}

static void get_drive(Object *obj, Visitor *v, void *opaque,

                      const char *name, Error **errp)

{

    get_pointer(obj, v, opaque, print_drive, name, errp);

}

static void set_drive(Object *obj, Visitor *v, void *opaque,

                      const char *name, Error **errp)

{

    set_pointer(obj, v, opaque, parse_drive, name, errp);

}

PropertyInfo qdev_prop_drive = {

    .name  = "drive",

    .get   = get_drive,

    .set   = set_drive,

    .release = release_drive,

};

/* --- character device --- */

static int parse_chr(DeviceState *dev, const char *str, void **ptr)

{

    CharDriverState *chr = qemu_chr_find(str);

    if (chr == NULL) {

        return -ENOENT;

    }

    if (qemu_chr_fe_claim(chr) != 0) {

        return -EEXIST;

    }

    *ptr = chr;

    return 0;

}

static void release_chr(Object *obj, const char *name, void *opaque)

{

    DeviceState *dev = DEVICE(obj);

    Property *prop = opaque;

    CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);

    CharDriverState *chr = *ptr;

    if (chr) {

        qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);

        qemu_chr_fe_release(chr);

    }

}

static const char *print_chr(void *ptr)

{

    CharDriverState *chr = ptr;

    return chr->label ? chr->label : "";

}

static void get_chr(Object *obj, Visitor *v, void *opaque,

                    const char *name, Error **errp)

{

    get_pointer(obj, v, opaque, print_chr, name, errp);

}

static void set_chr(Object *obj, Visitor *v, void *opaque,

                    const char *name, Error **errp)

{

    set_pointer(obj, v, opaque, parse_chr, name, errp);

}

PropertyInfo qdev_prop_chr = {

    .name  = "chr",

    .get   = get_chr,

    .set   = set_chr,

    .release = release_chr,

};

/* --- netdev device --- */

static int parse_netdev(DeviceState *dev, const char *str, void **ptr)

{

    NICPeers *peers_ptr = (NICPeers *)ptr;

    NICConf *conf = container_of(peers_ptr, NICConf, peers);

    NetClientState **ncs = peers_ptr->ncs;

    NetClientState *peers[MAX_QUEUE_NUM];

    int queues, i = 0;

    int ret;

    queues = qemu_find_net_clients_except(str, peers,

                                          NET_CLIENT_OPTIONS_KIND_NIC,

                                          MAX_QUEUE_NUM);

    if (queues == 0) {

        ret = -ENOENT;

        goto err;

    }

    if (queues > MAX_QUEUE_NUM) {

        ret = -E2BIG;

        goto err;

    }

    for (i = 0; i < queues; i++) {

        if (peers[i] == NULL) {

            ret = -ENOENT;

            goto err;

        }

        if (peers[i]->peer) {

            ret = -EEXIST;

            goto err;

        }

        ncs[i] = peers[i];

        ncs[i]->queue_index = i;

    }

    conf->queues = queues;

    return 0;

err:

    return ret;

}

static const char *print_netdev(void *ptr)

{

    NetClientState *netdev = ptr;

    return netdev->name ? netdev->name : "";

}

static void get_netdev(Object *obj, Visitor *v, void *opaque,

                       const char *name, Error **errp)

{

    get_pointer(obj, v, opaque, print_netdev, name, errp);

}

static void set_netdev(Object *obj, Visitor *v, void *opaque,

                       const char *name, Error **errp)

{

    set_pointer(obj, v, opaque, parse_netdev, name, errp);

}

PropertyInfo qdev_prop_netdev = {

    .name  = "netdev",

    .get   = get_netdev,

    .set   = set_netdev,

};

/* --- vlan --- */

static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)

{

    NetClientState **ptr = qdev_get_prop_ptr(dev, prop);

    if (*ptr) {

        int id;

        if (!net_hub_id_for_client(*ptr, &id)) {

            return snprintf(dest, len, "%d", id);

        }

    }

    return snprintf(dest, len, "<null>");

}

static void get_vlan(Object *obj, Visitor *v, void *opaque,

                     const char *name, Error **errp)

{

    DeviceState *dev = DEVICE(obj);

    Property *prop = opaque;

    NetClientState **ptr = qdev_get_prop_ptr(dev, prop);

    int32_t id = -1;

    if (*ptr) {

        int hub_id;

        if (!net_hub_id_for_client(*ptr, &hub_id)) {

            id = hub_id;

        }

    }

    visit_type_int32(v, &id, name, errp);

}

static void set_vlan(Object *obj, Visitor *v, void *opaque,

                     const char *name, Error **errp)

{

    DeviceState *dev = DEVICE(obj);

    Property *prop = opaque;

    NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);

    NetClientState **ptr = &peers_ptr->ncs[0];

    Error *local_err = NULL;

    int32_t id;

    NetClientState *hubport;

    if (dev->realized) {

        qdev_prop_set_after_realize(dev, name, errp);

        return;

    }

    visit_type_int32(v, &id, name, &local_err);

    if (local_err) {

        error_propagate(errp, local_err);

        return;

    }

    if (id == -1) {

        *ptr = NULL;

        return;

    }

    hubport = net_hub_port_find(id);

    if (!hubport) {

        error_set(errp, QERR_INVALID_PARAMETER_VALUE,

                  name, prop->info->name);

        return;

    }

    *ptr = hubport;

}

PropertyInfo qdev_prop_vlan = {

    .name  = "vlan",

    .print = print_vlan,

    .get   = get_vlan,

    .set   = set_vlan,

};

int qdev_prop_set_drive(DeviceState *dev, const char *name,

                        BlockDriverState *value)

{

    Error *errp = NULL;

    const char *bdrv_name = value ? bdrv_get_device_name(value) : "";

    object_property_set_str(OBJECT(dev), bdrv_name,

                            name, &errp);

    if (errp) {

        qerror_report_err(errp);

        error_free(errp);

        return -1;

    }

    return 0;

}

void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name,

                                BlockDriverState *value)

{

    if (qdev_prop_set_drive(dev, name, value) < 0) {

        exit(1);

    }

}

void qdev_prop_set_chr(DeviceState *dev, const char *name,

                       CharDriverState *value)

{

    Error *errp = NULL;

    assert(!value || value->label);

    object_property_set_str(OBJECT(dev),

                            value ? value->label : "", name, &errp);

    assert_no_error(errp);

}

void qdev_prop_set_netdev(DeviceState *dev, const char *name,

                          NetClientState *value)

{

    Error *errp = NULL;

    assert(!value || value->name);

    object_property_set_str(OBJECT(dev),

                            value ? value->name : "", name, &errp);

    assert_no_error(errp);

}

void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)

{

    qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);

    if (nd->netdev) {

        qdev_prop_set_netdev(dev, "netdev", nd->netdev);

    }

    if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&

        object_property_find(OBJECT(dev), "vectors", NULL)) {

        qdev_prop_set_uint32(dev, "vectors", nd->nvectors);

    }

    nd->instantiated = 1;

}

static int qdev_add_one_global(QemuOpts *opts, void *opaque)

{

    GlobalProperty *g;

    g = g_malloc0(sizeof(*g));

    g->driver   = qemu_opt_get(opts, "driver");

    g->property = qemu_opt_get(opts, "property");

    g->value    = qemu_opt_get(opts, "value");

    qdev_prop_register_global(g);

    return 0;

}

void qemu_add_globals(void)

{

    qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);

}