Archipelago » qemu

/*

 *  Dynamic device configuration and creation.

 *

 *  Copyright (c) 2009 CodeSourcery

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "qdev.h"

#include "monitor.h"

#include "qmp-commands.h"

/*

 * Aliases were a bad idea from the start.  Let's keep them

 * from spreading further.

 */

typedef struct QDevAlias

{

    const char *typename;

    const char *alias;

} QDevAlias;

static const QDevAlias qdev_alias_table[] = {

    { "virtio-blk-pci", "virtio-blk" },

    { "virtio-net-pci", "virtio-net" },

    { "virtio-serial-pci", "virtio-serial" },

    { "virtio-balloon-pci", "virtio-balloon" },

    { "virtio-blk-s390", "virtio-blk" },

    { "virtio-net-s390", "virtio-net" },

    { "virtio-serial-s390", "virtio-serial" },

    { "lsi53c895a", "lsi" },

    { "ich9-ahci", "ahci" },

    { }

};

static const char *qdev_class_get_alias(DeviceClass *dc)

{

    const char *typename = object_class_get_name(OBJECT_CLASS(dc));

    int i;

    for (i = 0; qdev_alias_table[i].typename; i++) {

        if (strcmp(qdev_alias_table[i].typename, typename) == 0) {

            return qdev_alias_table[i].alias;

        }

    }

    return NULL;

}

static bool qdev_class_has_alias(DeviceClass *dc)

{

    return (qdev_class_get_alias(dc) != NULL);

}

static void qdev_print_devinfo(ObjectClass *klass, void *opaque)

{

    DeviceClass *dc;

    bool *show_no_user = opaque;

    dc = (DeviceClass *)object_class_dynamic_cast(klass, TYPE_DEVICE);

    if (!dc || (show_no_user && !*show_no_user && dc->no_user)) {

        return;

    }

    error_printf("name \"%s\"", object_class_get_name(klass));

    if (dc->bus_info) {

        error_printf(", bus %s", dc->bus_info->name);

    }

    if (qdev_class_has_alias(dc)) {

        error_printf(", alias \"%s\"", qdev_class_get_alias(dc));

    }

    if (dc->desc) {

        error_printf(", desc \"%s\"", dc->desc);

    }

    if (dc->no_user) {

        error_printf(", no-user");

    }

    error_printf("\n");

}

static int set_property(const char *name, const char *value, void *opaque)

{

    DeviceState *dev = opaque;

    if (strcmp(name, "driver") == 0)

        return 0;

    if (strcmp(name, "bus") == 0)

        return 0;

    if (qdev_prop_parse(dev, name, value) == -1) {

        return -1;

    }

    return 0;

}

static const char *find_typename_by_alias(const char *alias)

{

    int i;

    for (i = 0; qdev_alias_table[i].alias; i++) {

        if (strcmp(qdev_alias_table[i].alias, alias) == 0) {

            return qdev_alias_table[i].typename;

        }

    }

    return NULL;

}

int qdev_device_help(QemuOpts *opts)

{

    const char *driver;

    Property *prop;

    ObjectClass *klass;

    DeviceClass *info;

    driver = qemu_opt_get(opts, "driver");

    if (driver && !strcmp(driver, "?")) {

        bool show_no_user = false;

        object_class_foreach(qdev_print_devinfo, TYPE_DEVICE, false, &show_no_user);

        return 1;

    }

    if (!driver || !qemu_opt_get(opts, "?")) {

        return 0;

    }

    klass = object_class_by_name(driver);

    if (!klass) {

        const char *typename = find_typename_by_alias(driver);

        if (typename) {

            driver = typename;

            klass = object_class_by_name(driver);

        }

    }

    if (!klass) {

        return 0;

    }

    info = DEVICE_CLASS(klass);

    for (prop = info->props; prop && prop->name; prop++) {

        /*

         * TODO Properties without a parser are just for dirty hacks.

         * qdev_prop_ptr is the only such PropertyInfo.  It's marked

         * for removal.  This conditional should be removed along with

         * it.

         */

        if (!prop->info->set) {

            continue;           /* no way to set it, don't show */

        }

        error_printf("%s.%s=%s\n", driver, prop->name,

                     prop->info->legacy_name ?: prop->info->name);

    }

    if (info->bus_info) {

        for (prop = info->bus_info->props; prop && prop->name; prop++) {

            if (!prop->info->set) {

                continue;           /* no way to set it, don't show */

            }

            error_printf("%s.%s=%s\n", driver, prop->name,

                         prop->info->legacy_name ?: prop->info->name);

        }

    }

    return 1;

}

static Object *qdev_get_peripheral(void)

{

    static Object *dev;

    if (dev == NULL) {

        dev = container_get(qdev_get_machine(), "/peripheral");

    }

    return dev;

}

static Object *qdev_get_peripheral_anon(void)

{

    static Object *dev;

    if (dev == NULL) {

        dev = container_get(qdev_get_machine(), "/peripheral-anon");

    }

    return dev;

}

static void qbus_list_bus(DeviceState *dev)

{

    BusState *child;

    const char *sep = " ";

    error_printf("child busses at \"%s\":",

                 dev->id ? dev->id : object_get_typename(OBJECT(dev)));

    QLIST_FOREACH(child, &dev->child_bus, sibling) {

        error_printf("%s\"%s\"", sep, child->name);

        sep = ", ";

    }

    error_printf("\n");

}

static void qbus_list_dev(BusState *bus)

{

    DeviceState *dev;

    const char *sep = " ";

    error_printf("devices at \"%s\":", bus->name);

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        error_printf("%s\"%s\"", sep, object_get_typename(OBJECT(dev)));

        if (dev->id)

            error_printf("/\"%s\"", dev->id);

        sep = ", ";

    }

    error_printf("\n");

}

static BusState *qbus_find_bus(DeviceState *dev, char *elem)

{

    BusState *child;

    QLIST_FOREACH(child, &dev->child_bus, sibling) {

        if (strcmp(child->name, elem) == 0) {

            return child;

        }

    }

    return NULL;

}

static DeviceState *qbus_find_dev(BusState *bus, char *elem)

{

    DeviceState *dev;

    /*

     * try to match in order:

     *   (1) instance id, if present

     *   (2) driver name

     *   (3) driver alias, if present

     */

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        if (dev->id  &&  strcmp(dev->id, elem) == 0) {

            return dev;

        }

    }

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {

            return dev;

        }

    }

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        DeviceClass *dc = DEVICE_GET_CLASS(dev);

        if (qdev_class_has_alias(dc) &&

            strcmp(qdev_class_get_alias(dc), elem) == 0) {

            return dev;

        }

    }

    return NULL;

}

static BusState *qbus_find_recursive(BusState *bus, const char *name,

                                     const BusInfo *info)

{

    DeviceState *dev;

    BusState *child, *ret;

    int match = 1;

    if (name && (strcmp(bus->name, name) != 0)) {

        match = 0;

    }

    if (info && (bus->info != info)) {

        match = 0;

    }

    if (match) {

        return bus;

    }

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        QLIST_FOREACH(child, &dev->child_bus, sibling) {

            ret = qbus_find_recursive(child, name, info);

            if (ret) {

                return ret;

            }

        }

    }

    return NULL;

}

static BusState *qbus_find(const char *path)

{

    DeviceState *dev;

    BusState *bus;

    char elem[128];

    int pos, len;

    /* find start element */

    if (path[0] == '/') {

        bus = sysbus_get_default();

        pos = 0;

    } else {

        if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {

            assert(!path[0]);

            elem[0] = len = 0;

        }

        bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);

        if (!bus) {

            qerror_report(QERR_BUS_NOT_FOUND, elem);

            return NULL;

        }

        pos = len;

    }

    for (;;) {

        assert(path[pos] == '/' || !path[pos]);

        while (path[pos] == '/') {

            pos++;

        }

        if (path[pos] == '\0') {

            return bus;

        }

        /* find device */

        if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {

            assert(0);

            elem[0] = len = 0;

        }

        pos += len;

        dev = qbus_find_dev(bus, elem);

        if (!dev) {

            qerror_report(QERR_DEVICE_NOT_FOUND, elem);

            if (!monitor_cur_is_qmp()) {

                qbus_list_dev(bus);

            }

            return NULL;

        }

        assert(path[pos] == '/' || !path[pos]);

        while (path[pos] == '/') {

            pos++;

        }

        if (path[pos] == '\0') {

            /* last specified element is a device.  If it has exactly

             * one child bus accept it nevertheless */

            switch (dev->num_child_bus) {

            case 0:

                qerror_report(QERR_DEVICE_NO_BUS, elem);

                return NULL;

            case 1:

                return QLIST_FIRST(&dev->child_bus);

            default:

                qerror_report(QERR_DEVICE_MULTIPLE_BUSSES, elem);

                if (!monitor_cur_is_qmp()) {

                    qbus_list_bus(dev);

                }

                return NULL;

            }

        }

        /* find bus */

        if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {

            assert(0);

            elem[0] = len = 0;

        }

        pos += len;

        bus = qbus_find_bus(dev, elem);

        if (!bus) {

            qerror_report(QERR_BUS_NOT_FOUND, elem);

            if (!monitor_cur_is_qmp()) {

                qbus_list_bus(dev);

            }

            return NULL;

        }

    }

}

DeviceState *qdev_device_add(QemuOpts *opts)

{

    ObjectClass *obj;

    DeviceClass *k;

    const char *driver, *path, *id;

    DeviceState *qdev;

    BusState *bus;

    driver = qemu_opt_get(opts, "driver");

    if (!driver) {

        qerror_report(QERR_MISSING_PARAMETER, "driver");

        return NULL;

    }

    /* find driver */

    obj = object_class_by_name(driver);

    if (!obj) {

        const char *typename = find_typename_by_alias(driver);

        if (typename) {

            driver = typename;

            obj = object_class_by_name(driver);

        }

    }

    if (!obj) {

        qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver", "device type");

        return NULL;

    }

    k = DEVICE_CLASS(obj);

    /* find bus */

    path = qemu_opt_get(opts, "bus");

    if (path != NULL) {

        bus = qbus_find(path);

        if (!bus) {

            return NULL;

        }

        if (bus->info != k->bus_info) {

            qerror_report(QERR_BAD_BUS_FOR_DEVICE,

                           driver, bus->info->name);

            return NULL;

        }

    } else {

        bus = qbus_find_recursive(sysbus_get_default(), NULL, k->bus_info);

        if (!bus) {

            qerror_report(QERR_NO_BUS_FOR_DEVICE,

                          driver, k->bus_info->name);

            return NULL;

        }

    }

    if (qdev_hotplug && !bus->allow_hotplug) {

        qerror_report(QERR_BUS_NO_HOTPLUG, bus->name);

        return NULL;

    }

    if (!bus) {

        bus = sysbus_get_default();

    }

    /* create device, set properties */

    qdev = DEVICE(object_new(driver));

    qdev_set_parent_bus(qdev, bus);

    qdev_prop_set_globals(qdev);

    id = qemu_opts_id(opts);

    if (id) {

        qdev->id = id;

    }

    if (qemu_opt_foreach(opts, set_property, qdev, 1) != 0) {

        qdev_free(qdev);

        return NULL;

    }

    if (qdev->id) {

        object_property_add_child(qdev_get_peripheral(), qdev->id,

                                  OBJECT(qdev), NULL);

    } else {

        static int anon_count;

        gchar *name = g_strdup_printf("device[%d]", anon_count++);

        object_property_add_child(qdev_get_peripheral_anon(), name,

                                  OBJECT(qdev), NULL);

        g_free(name);

    }        

    if (qdev_init(qdev) < 0) {

        qerror_report(QERR_DEVICE_INIT_FAILED, driver);

        return NULL;

    }

    qdev->opts = opts;

    return qdev;

}

#define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)

static void qbus_print(Monitor *mon, BusState *bus, int indent);

static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,

                             const char *prefix, int indent)

{

    if (!props)

        return;

    for (; props->name; props++) {

        Error *err = NULL;

        char *value;

        char *legacy_name = g_strdup_printf("legacy-%s", props->name);

        if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {

            value = object_property_get_str(OBJECT(dev), legacy_name, &err);

        } else {

            value = object_property_print(OBJECT(dev), props->name, &err);

        }

        g_free(legacy_name);

        if (err) {

            error_free(err);

            continue;

        }

        qdev_printf("%s-prop: %s = %s\n", prefix, props->name,

                    value && *value ? value : "<null>");

        g_free(value);

    }

}

static void qdev_print(Monitor *mon, DeviceState *dev, int indent)

{

    BusState *child;

    qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),

                dev->id ? dev->id : "");

    indent += 2;

    if (dev->num_gpio_in) {

        qdev_printf("gpio-in %d\n", dev->num_gpio_in);

    }

    if (dev->num_gpio_out) {

        qdev_printf("gpio-out %d\n", dev->num_gpio_out);

    }

    qdev_print_props(mon, dev, qdev_get_props(dev), "dev", indent);

    qdev_print_props(mon, dev, dev->parent_bus->info->props, "bus", indent);

    if (dev->parent_bus->info->print_dev)

        dev->parent_bus->info->print_dev(mon, dev, indent);

    QLIST_FOREACH(child, &dev->child_bus, sibling) {

        qbus_print(mon, child, indent);

    }

}

static void qbus_print(Monitor *mon, BusState *bus, int indent)

{

    struct DeviceState *dev;

    qdev_printf("bus: %s\n", bus->name);

    indent += 2;

    qdev_printf("type %s\n", bus->info->name);

    QTAILQ_FOREACH(dev, &bus->children, sibling) {

        qdev_print(mon, dev, indent);

    }

}

#undef qdev_printf

void do_info_qtree(Monitor *mon)

{

    if (sysbus_get_default())

        qbus_print(mon, sysbus_get_default(), 0);

}

void do_info_qdm(Monitor *mon)

{

    object_class_foreach(qdev_print_devinfo, TYPE_DEVICE, false, NULL);

}

int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)

{

    Error *local_err = NULL;

    QemuOpts *opts;

    opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);

    if (error_is_set(&local_err)) {

        qerror_report_err(local_err);

        error_free(local_err);

        return -1;

    }

    if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {

        qemu_opts_del(opts);

        return 0;

    }

    if (!qdev_device_add(opts)) {

        qemu_opts_del(opts);

        return -1;

    }

    return 0;

}

void qmp_device_del(const char *id, Error **errp)

{

    DeviceState *dev;

    dev = qdev_find_recursive(sysbus_get_default(), id);

    if (NULL == dev) {

        error_set(errp, QERR_DEVICE_NOT_FOUND, id);

        return;

    }

    qdev_unplug(dev, errp);

}

void qdev_machine_init(void)

{

    qdev_get_peripheral_anon();

    qdev_get_peripheral();

}