bwlp/qemu.git - Experimental fork of QEMU with video encoding patches

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Diffstat (limited to 'scripts/git-submodule.sh')

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/*
 *  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/>.
 */

/* The theory here is that it should be possible to create a machine without
   knowledge of specific devices.  Historically board init routines have
   passed a bunch of arguments to each device, requiring the board know
   exactly which device it is dealing with.  This file provides an abstract
   API for device configuration and initialization.  Devices will generally
   inherit from a particular bus (e.g. PCI or I2C) rather than
   this API directly.  */

#include "qemu/osdep.h"
#include "hw/qdev.h"
#include "sysemu/sysemu.h"
#include "qapi/error.h"
#include "qapi/qapi-events-misc.h"
#include "qapi/qmp/qerror.h"
#include "qapi/visitor.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "hw/hotplug.h"
#include "hw/boards.h"
#include "hw/sysbus.h"

bool qdev_hotplug = false;
static bool qdev_hot_added = false;
bool qdev_hot_removed = false;

const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
{
    DeviceClass *dc = DEVICE_GET_CLASS(dev);
    return dc->vmsd;
}

static void bus_remove_child(BusState *bus, DeviceState *child)
{
    BusChild *kid;

    QTAILQ_FOREACH(kid, &bus->children, sibling) {
        if (kid->child == child) {
            char name[32];

            snprintf(name, sizeof(name), "child[%d]", kid->index);
            QTAILQ_REMOVE(&bus->children, kid, sibling);

            /* This gives back ownership of kid->child back to us.  */
            object_property_del(OBJECT(bus), name, NULL);
            object_unref(OBJECT(kid->child));
            g_free(kid);
            return;
        }
    }
}

static void bus_add_child(BusState *bus, DeviceState *child)
{
    char name[32];
    BusChild *kid = g_malloc0(sizeof(*kid));

    kid->index = bus->max_index++;
    kid->child = child;
    object_ref(OBJECT(kid->child));

    QTAILQ_INSERT_HEAD(&bus->children, kid, sibling);

    /* This transfers ownership of kid->child to the property.  */
    snprintf(name, sizeof(name), "child[%d]", kid->index);
    object_property_add_link(OBJECT(bus), name,
                             object_get_typename(OBJECT(child)),
                             (Object **)&kid->child,
                             NULL, /* read-only property */
                             0, /* return ownership on prop deletion */
                             NULL);
}

void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
{
    bool replugging = dev->parent_bus != NULL;

    if (replugging) {
        /* Keep a reference to the device while it's not plugged into
         * any bus, to avoid it potentially evaporating when it is
         * dereffed in bus_remove_child().
         */
        object_ref(OBJECT(dev));
        bus_remove_child(dev->parent_bus, dev);
        object_unref(OBJECT(dev->parent_bus));
    }
    dev->parent_bus = bus;
    object_ref(OBJECT(bus));
    bus_add_child(bus, dev);
    if (replugging) {
        object_unref(OBJECT(dev));
    }
}

/* Create a new device.  This only initializes the device state
   structure and allows properties to be set.  The device still needs
   to be realized.  See qdev-core.h.  */
DeviceState *qdev_create(BusState *bus, const char *name)
{
    DeviceState *dev;

    dev = qdev_try_create(bus, name);
    if (!dev) {
        if (bus) {
            error_report("Unknown device '%s' for bus '%s'", name,
                         object_get_typename(OBJECT(bus)));
        } else {
            error_report("Unknown device '%s' for default sysbus", name);
        }
        abort();
    }

    return dev;
}

DeviceState *qdev_try_create(BusState *bus, const char *type)
{
    DeviceState *dev;

    if (object_class_by_name(type) == NULL) {
        return NULL;
    }
    dev = DEVICE(object_new(type));
    if (!dev) {
        return NULL;
    }

    if (!bus) {
        /* Assert that the device really is a SysBusDevice before
         * we put it onto the sysbus. Non-sysbus devices which aren't
         * being put onto a bus should be created with object_new(TYPE_FOO),
         * not qdev_create(NULL, TYPE_FOO).
         */
        g_assert(object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE));
        bus = sysbus_get_default();
    }

    qdev_set_parent_bus(dev, bus);
    object_unref(OBJECT(dev));
    return dev;
}

static QTAILQ_HEAD(device_listeners, DeviceListener) device_listeners
    = QTAILQ_HEAD_INITIALIZER(device_listeners);

enum ListenerDirection { Forward, Reverse };

#define DEVICE_LISTENER_CALL(_callback, _direction, _args...)     \
    do {                                                          \
        DeviceListener *_listener;                                \
                                                                  \
        switch (_direction) {                                     \
        case Forward:                                             \
            QTAILQ_FOREACH(_listener, &device_listeners, link) {  \
                if (_listener->_callback) {                       \
                    _listener->_callback(_listener, ##_args);     \
                }                                                 \
            }                                                     \
            break;                                                \
        case Reverse:                                             \
            QTAILQ_FOREACH_REVERSE(_listener, &device_listeners,  \
                                   device_listeners, link) {      \
                if (_listener->_callback) {                       \
                    _listener->_callback(_listener, ##_args);     \
                }                                                 \
            }                                                     \
            break;                                                \
        default:                                                  \
            abort();                                              \
        }                                                         \
    } while (0)

static int device_listener_add(DeviceState *dev, void *opaque)
{
    DEVICE_LISTENER_CALL(realize, Forward, dev);

    return 0;
}

void device_listener_register(DeviceListener *listener)
{
    QTAILQ_INSERT_TAIL(&device_listeners, listener, link);

    qbus_walk_children(sysbus_get_default(), NULL, NULL, device_listener_add,
                       NULL, NULL);
}

void device_listener_unregister(DeviceListener *listener)
{
    QTAILQ_REMOVE(&device_listeners, listener, link);
}

void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
                                 int required_for_version)
{
    assert(!dev->realized);
    dev->instance_id_alias = alias_id;
    dev->alias_required_for_version = required_for_version;
}

HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev)
{
    MachineState *machine;
    MachineClass *mc;
    Object *m_obj = qdev_get_machine();

    if (object_dynamic_cast(m_obj, TYPE_MACHINE)) {
        machine = MACHINE(m_obj);
        mc = MACHINE_GET_CLASS(machine);
        if (mc->get_hotplug_handler) {
            return mc->get_hotplug_handler(machine, dev);
        }
    }

    return NULL;
}

HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev)
{
    HotplugHandler *hotplug_ctrl;

    if (dev->parent_bus && dev->parent_bus->hotplug_handler) {
        hotplug_ctrl = dev->parent_bus->hotplug_handler;
    } else {
        hotplug_ctrl = qdev_get_machine_hotplug_handler(dev);
    }
    return hotplug_ctrl;
}

static int qdev_reset_one(DeviceState *dev, void *opaque)
{
    device_reset(dev);

    return 0;
}

static int qbus_reset_one(BusState *bus, void *opaque)
{
    BusClass *bc = BUS_GET_CLASS(bus);
    if (bc->reset) {
        bc->reset(bus);
    }
    return 0;
}

void qdev_reset_all(DeviceState *dev)
{
    qdev_walk_children(dev, NULL, NULL, qdev_reset_one, qbus_reset_one, NULL);
}

void qdev_reset_all_fn(void *opaque)
{
    qdev_reset_all(DEVICE(opaque));
}

void qbus_reset_all(BusState *bus)
{
    qbus_walk_children(bus, NULL, NULL, qdev_reset_one, qbus_reset_one, NULL);
}

void qbus_reset_all_fn(void *opaque)
{
    BusState *bus = opaque;
    qbus_reset_all(bus);
}

/* can be used as ->unplug() callback for the simple cases */
void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
                                  DeviceState *dev, Error **errp)
{
    /* just zap it */
    object_unparent(OBJECT(dev));
}

/*
 * Realize @dev.
 * Device properties should be set before calling this function.  IRQs
 * and MMIO regions should be connected/mapped after calling this
 * function.
 * On failure, report an error with error_report() and terminate the
 * program.  This is okay during machine creation.  Don't use for
 * hotplug, because there callers need to recover from failure.
 * Exception: if you know the device's init() callback can't fail,
 * then qdev_init_nofail() can't fail either, and is therefore usable
 * even then.  But relying on the device implementation that way is
 * somewhat unclean, and best avoided.
 */
void qdev_init_nofail(DeviceState *dev)
{
    Error *err = NULL;

    assert(!dev->realized);

    object_ref(OBJECT(dev));
    object_property_set_bool(OBJECT(dev), true, "realized", &err);
    if (err) {
        error_reportf_err(err, "Initialization of device %s failed: ",
                          object_get_typename(OBJECT(dev)));
        exit(1);
    }
    object_unref(OBJECT(dev));
}

void qdev_machine_creation_done(void)
{
    /*
     * ok, initial machine setup is done, starting from now we can
     * only create hotpluggable devices
     */
    qdev_hotplug = true;
}

bool qdev_machine_modified(void)
{
    return qdev_hot_added || qdev_hot_removed;
}

BusState *qdev_get_parent_bus(DeviceState *dev)
{
    return dev->parent_bus;
}

static NamedGPIOList *qdev_get_named_gpio_list(DeviceState *dev,
                                               const char *name)
{
    NamedGPIOList *ngl;

    QLIST_FOREACH(ngl, &dev->gpios, node) {
        /* NULL is a valid and matchable name, otherwise do a normal
         * strcmp match.
         */
        if ((!ngl->name && !name) ||
                (name && ngl->name && strcmp(name, ngl->name) == 0)) {
            return ngl;
        }
    }

    ngl = g_malloc0(sizeof(*ngl));
    ngl->name = g_strdup(name);
    QLIST_INSERT_HEAD(&dev->gpios, ngl, node);
    return ngl;
}

void qdev_init_gpio_in_named_with_opaque(DeviceState *dev,
                                         qemu_irq_handler handler,
                                         void *opaque,
                                         const char *name, int n)
{
    int i;
    NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name);

    assert(gpio_list->num_out == 0 || !name);
    gpio_list->in = qemu_extend_irqs(gpio_list->in, gpio_list->num_in, handler,
                                     opaque, n);

    if (!name) {
        name = "unnamed-gpio-in";
    }
    for (i = gpio_list->num_in; i < gpio_list->num_in + n; i++) {
        gchar *propname = g_strdup_printf("%s[%u]", name, i);

        object_property_add_child(OBJECT(dev), propname,
                                  OBJECT(gpio_list->in[i]), &error_abort);
        g_free(propname);
    }

    gpio_list->num_in += n;
}

void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
{
    qdev_init_gpio_in_named(dev, handler, NULL, n);
}

void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
                              const char *name, int n)
{
    int i;
    NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name);

    assert(gpio_list->num_in == 0 || !name);

    if (!name) {
        name = "unnamed-gpio-out";
    }
    memset(pins, 0, sizeof(*pins) * n);
    for (i = 0; i < n; ++i) {
        gchar *propname = g_strdup_printf("%s[%u]", name,
                                          gpio_list->num_out + i);

        object_property_add_link(OBJECT(dev), propname, TYPE_IRQ,
                                 (Object **)&pins[i],
                                 object_property_allow_set_link,
                                 OBJ_PROP_LINK_STRONG,
                                 &error_abort);
        g_free(propname);
    }
    gpio_list->num_out += n;
}

void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
{
    qdev_init_gpio_out_named(dev, pins, NULL, n);
}

qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n)
{
    NamedGPIOList *gpio_list = qdev_get_named_gpio_list(dev, name);

    assert(n >= 0 && n < gpio_list->num_in);
    return gpio_list->in[n];
}

qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
{
    return qdev_get_gpio_in_named(dev, NULL, n);
}

void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
                                 qemu_irq pin)
{
    char *propname = g_strdup_printf("%s[%d]",
                                     name ? name : "unnamed-gpio-out", n);
    if (pin) {
        /* We need a name for object_property_set_link to work.  If the
         * object has a parent, object_property_add_child will come back
         * with an error without doing anything.  If it has none, it will
         * never fail.  So we can just call it with a NULL Error pointer.
         */
        object_property_add_child(container_get(qdev_get_machine(),
                                                "/unattached"),
                                  "non-qdev-gpio[*]", OBJECT(pin), NULL);
    }
    object_property_set_link(OBJECT(dev), OBJECT(pin), propname, &error_abort);
    g_free(propname);
}

qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n)
{
    char *propname = g_strdup_printf("%s[%d]",
                                     name ? name : "unnamed-gpio-out", n);

    qemu_irq ret = (qemu_irq)object_property_get_link(OBJECT(dev), propname,
                                                      NULL);

    return ret;
}

/* disconnect a GPIO output, returning the disconnected input (if any) */

static qemu_irq qdev_disconnect_gpio_out_named(DeviceState *dev,
                                               const char *name, int n)
{
    char *propname = g_strdup_printf("%s[%d]",
                                     name ? name : "unnamed-gpio-out", n);

    qemu_irq ret = (qemu_irq)object_property_get_link(OBJECT(dev), propname,
                                                      NULL);
    if (ret) {
        object_property_set_link(OBJECT(dev), NULL, propname, NULL);
    }
    g_free(propname);
    return ret;
}

qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
                                 const char *name, int n)
{
    qemu_irq disconnected = qdev_disconnect_gpio_out_named(dev, name, n);
    qdev_connect_gpio_out_named(dev, name, n, icpt);
    return disconnected;
}

void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
{
    qdev_connect_gpio_out_named(dev, NULL, n, pin);
}

void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
                     const char *name)
{
    int i;
    NamedGPIOList *ngl = qdev_get_named_gpio_list(dev, name);

    for (i = 0; i < ngl->num_in; i++) {
        const char *nm = ngl->name ? ngl->name : "unnamed-gpio-in";
        char *propname = g_strdup_printf("%s[%d]", nm, i);

        object_property_add_alias(OBJECT(container), propname,
                                  OBJECT(dev), propname,
                                  &error_abort);
        g_free(propname);
    }
    for (i = 0; i < ngl->num_out; i++) {
        const char *nm = ngl->name ? ngl->name : "unnamed-gpio-out";
        char *propname = g_strdup_printf("%s[%d]", nm, i);

        object_property_add_alias(OBJECT(container), propname,
                                  OBJECT(dev), propname,
                                  &error_abort);
        g_free(propname);
    }
    QLIST_REMOVE(ngl, node);
    QLIST_INSERT_HEAD(&container->gpios, ngl, node);
}

BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
{
    BusState *bus;
    Object *child = object_resolve_path_component(OBJECT(dev), name);

    bus = (BusState *)object_dynamic_cast(child, TYPE_BUS);
    if (bus) {
        return bus;
    }

    QLIST_FOREACH(bus, &dev->child_bus, sibling) {
        if (strcmp(name, bus->name) == 0) {
            return bus;
        }
    }
    return NULL;
}

int qdev_walk_children(DeviceState *dev,
                       qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
                       qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
                       void *opaque)
{
    BusState *bus;
    int err;

    if (pre_devfn) {
        err = pre_devfn(dev, opaque);
        if (err) {
            return err;
        }
    }

    QLIST_FOREACH(bus, &dev->child_bus, sibling) {
        err = qbus_walk_children(bus, pre_devfn, pre_busfn,
                                 post_devfn, post_busfn, opaque);
        if (err < 0) {
            return err;
        }
    }

    if (post_devfn) {
        err = post_devfn(dev, opaque);
        if (err) {
            return err;
        }
    }

    return 0;
}

DeviceState *qdev_find_recursive(BusState *bus, const char *id)
{
    BusChild *kid;
    DeviceState *ret;
    BusState *child;

    QTAILQ_FOREACH(kid, &bus->children, sibling) {
        DeviceState *dev = kid->child;

        if (dev->id && strcmp(dev->id, id) == 0) {
            return dev;
        }

        QLIST_FOREACH(child, &dev->child_bus, sibling) {
            ret = qdev_find_recursive(child, id);
            if (ret) {
                return ret;
            }
        }
    }
    return NULL;
}

char *qdev_get_dev_path(DeviceState *dev)
{
    BusClass *bc;


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