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80e555c241
This patch adds a visitor interface to Property. This way, QOM will be able to expose Properties that access a fixed field in a struct without exposing also the everything-is-a-string "feature" of qdev properties. Whenever the printed representation in both QOM and qdev (which is typically the case for device backends), parse/print code can be reused via get_generic/set_generic. Dually, whenever multiple PropertyInfos have the same representation in both the struct and the visitors the code can be reused (for example among all of int32/uint32/hex32). Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
620 lines
21 KiB
C
620 lines
21 KiB
C
#ifndef QDEV_H
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#define QDEV_H
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#include "hw.h"
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#include "qemu-queue.h"
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#include "qemu-char.h"
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#include "qemu-option.h"
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#include "qapi/qapi-visit-core.h"
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typedef struct Property Property;
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typedef struct PropertyInfo PropertyInfo;
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typedef struct CompatProperty CompatProperty;
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typedef struct DeviceInfo DeviceInfo;
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typedef struct BusState BusState;
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typedef struct BusInfo BusInfo;
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enum DevState {
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DEV_STATE_CREATED = 1,
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DEV_STATE_INITIALIZED,
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};
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enum {
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DEV_NVECTORS_UNSPECIFIED = -1,
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};
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/**
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* @DevicePropertyAccessor - called when trying to get/set a property
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*
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* @dev the device that owns the property
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* @v the visitor that contains the property data
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* @opaque the device property opaque
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* @name the name of the property
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* @errp a pointer to an Error that is filled if getting/setting fails.
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*/
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typedef void (DevicePropertyAccessor)(DeviceState *dev,
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Visitor *v,
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void *opaque,
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const char *name,
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Error **errp);
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/**
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* @DevicePropertyRelease - called when a property is removed from a device
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*
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* @dev the device that owns the property
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* @name the name of the property
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* @opaque the opaque registered with the property
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*/
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typedef void (DevicePropertyRelease)(DeviceState *dev,
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const char *name,
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void *opaque);
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typedef struct DeviceProperty
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{
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gchar *name;
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gchar *type;
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DevicePropertyAccessor *get;
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DevicePropertyAccessor *set;
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DevicePropertyRelease *release;
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void *opaque;
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QTAILQ_ENTRY(DeviceProperty) node;
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} DeviceProperty;
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/* This structure should not be accessed directly. We declare it here
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so that it can be embedded in individual device state structures. */
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struct DeviceState {
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const char *id;
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enum DevState state;
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QemuOpts *opts;
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int hotplugged;
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DeviceInfo *info;
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BusState *parent_bus;
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int num_gpio_out;
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qemu_irq *gpio_out;
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int num_gpio_in;
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qemu_irq *gpio_in;
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QLIST_HEAD(, BusState) child_bus;
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int num_child_bus;
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QTAILQ_ENTRY(DeviceState) sibling;
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int instance_id_alias;
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int alias_required_for_version;
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/**
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* This tracks the number of references between devices. See @qdev_ref for
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* more information.
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*/
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uint32_t ref;
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QTAILQ_HEAD(, DeviceProperty) properties;
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/* Do not, under any circumstance, use this parent link below anywhere
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* outside of qdev.c. You have been warned. */
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DeviceState *parent;
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};
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typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);
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typedef char *(*bus_get_dev_path)(DeviceState *dev);
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/*
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* This callback is used to create Open Firmware device path in accordance with
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* OF spec http://forthworks.com/standards/of1275.pdf. Indicidual bus bindings
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* can be found here http://playground.sun.com/1275/bindings/.
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*/
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typedef char *(*bus_get_fw_dev_path)(DeviceState *dev);
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typedef int (qbus_resetfn)(BusState *bus);
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struct BusInfo {
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const char *name;
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size_t size;
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bus_dev_printfn print_dev;
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bus_get_dev_path get_dev_path;
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bus_get_fw_dev_path get_fw_dev_path;
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qbus_resetfn *reset;
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Property *props;
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};
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struct BusState {
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DeviceState *parent;
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BusInfo *info;
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const char *name;
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int allow_hotplug;
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int qdev_allocated;
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QTAILQ_HEAD(ChildrenHead, DeviceState) children;
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QLIST_ENTRY(BusState) sibling;
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};
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struct Property {
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const char *name;
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PropertyInfo *info;
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int offset;
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int bitnr;
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void *defval;
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};
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enum PropertyType {
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PROP_TYPE_UNSPEC = 0,
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PROP_TYPE_UINT8,
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PROP_TYPE_UINT16,
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PROP_TYPE_UINT32,
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PROP_TYPE_INT32,
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PROP_TYPE_UINT64,
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PROP_TYPE_TADDR,
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PROP_TYPE_MACADDR,
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PROP_TYPE_DRIVE,
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PROP_TYPE_CHR,
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PROP_TYPE_STRING,
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PROP_TYPE_NETDEV,
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PROP_TYPE_VLAN,
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PROP_TYPE_PTR,
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PROP_TYPE_BIT,
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};
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struct PropertyInfo {
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const char *name;
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size_t size;
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enum PropertyType type;
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int64_t min;
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int64_t max;
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int (*parse)(DeviceState *dev, Property *prop, const char *str);
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int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
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void (*free)(DeviceState *dev, Property *prop);
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DevicePropertyAccessor *get;
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DevicePropertyAccessor *set;
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};
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typedef struct GlobalProperty {
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const char *driver;
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const char *property;
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const char *value;
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QTAILQ_ENTRY(GlobalProperty) next;
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} GlobalProperty;
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/*** Board API. This should go away once we have a machine config file. ***/
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DeviceState *qdev_create(BusState *bus, const char *name);
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DeviceState *qdev_try_create(BusState *bus, const char *name);
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int qdev_device_help(QemuOpts *opts);
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DeviceState *qdev_device_add(QemuOpts *opts);
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int qdev_init(DeviceState *dev) QEMU_WARN_UNUSED_RESULT;
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void qdev_init_nofail(DeviceState *dev);
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void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
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int required_for_version);
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int qdev_unplug(DeviceState *dev);
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void qdev_free(DeviceState *dev);
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int qdev_simple_unplug_cb(DeviceState *dev);
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void qdev_machine_creation_done(void);
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bool qdev_machine_modified(void);
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qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
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void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
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BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
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/*** Device API. ***/
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typedef int (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
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typedef int (*qdev_event)(DeviceState *dev);
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typedef void (*qdev_resetfn)(DeviceState *dev);
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struct DeviceInfo {
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const char *name;
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const char *fw_name;
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const char *alias;
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const char *desc;
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size_t size;
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Property *props;
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int no_user;
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/* callbacks */
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qdev_resetfn reset;
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/* device state */
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const VMStateDescription *vmsd;
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/* Private to qdev / bus. */
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qdev_initfn init;
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qdev_event unplug;
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qdev_event exit;
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BusInfo *bus_info;
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struct DeviceInfo *next;
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};
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extern DeviceInfo *device_info_list;
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void qdev_register(DeviceInfo *info);
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/* Register device properties. */
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/* GPIO inputs also double as IRQ sinks. */
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void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
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void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
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CharDriverState *qdev_init_chardev(DeviceState *dev);
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BusState *qdev_get_parent_bus(DeviceState *dev);
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/*** BUS API. ***/
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DeviceState *qdev_find_recursive(BusState *bus, const char *id);
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/* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
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typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
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typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
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void qbus_create_inplace(BusState *bus, BusInfo *info,
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DeviceState *parent, const char *name);
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BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name);
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/* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
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* < 0 if either devfn or busfn terminate walk somewhere in cursion,
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* 0 otherwise. */
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int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
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qbus_walkerfn *busfn, void *opaque);
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int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
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qbus_walkerfn *busfn, void *opaque);
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void qdev_reset_all(DeviceState *dev);
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void qbus_reset_all_fn(void *opaque);
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void qbus_free(BusState *bus);
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#define FROM_QBUS(type, dev) DO_UPCAST(type, qbus, dev)
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/* This should go away once we get rid of the NULL bus hack */
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BusState *sysbus_get_default(void);
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/*** monitor commands ***/
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void do_info_qtree(Monitor *mon);
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void do_info_qdm(Monitor *mon);
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int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data);
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int do_device_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
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/*** qdev-properties.c ***/
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extern PropertyInfo qdev_prop_bit;
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extern PropertyInfo qdev_prop_uint8;
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extern PropertyInfo qdev_prop_uint16;
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extern PropertyInfo qdev_prop_uint32;
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extern PropertyInfo qdev_prop_int32;
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extern PropertyInfo qdev_prop_uint64;
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extern PropertyInfo qdev_prop_hex8;
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extern PropertyInfo qdev_prop_hex32;
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extern PropertyInfo qdev_prop_hex64;
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extern PropertyInfo qdev_prop_string;
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extern PropertyInfo qdev_prop_chr;
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extern PropertyInfo qdev_prop_ptr;
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extern PropertyInfo qdev_prop_macaddr;
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extern PropertyInfo qdev_prop_drive;
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extern PropertyInfo qdev_prop_netdev;
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extern PropertyInfo qdev_prop_vlan;
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extern PropertyInfo qdev_prop_pci_devfn;
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#define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
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.name = (_name), \
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.info = &(_prop), \
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.offset = offsetof(_state, _field) \
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+ type_check(_type,typeof_field(_state, _field)), \
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}
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#define DEFINE_PROP_DEFAULT(_name, _state, _field, _defval, _prop, _type) { \
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.name = (_name), \
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.info = &(_prop), \
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.offset = offsetof(_state, _field) \
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+ type_check(_type,typeof_field(_state, _field)), \
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.defval = (_type[]) { _defval }, \
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}
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#define DEFINE_PROP_BIT(_name, _state, _field, _bit, _defval) { \
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.name = (_name), \
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.info = &(qdev_prop_bit), \
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.bitnr = (_bit), \
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.offset = offsetof(_state, _field) \
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+ type_check(uint32_t,typeof_field(_state, _field)), \
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.defval = (bool[]) { (_defval) }, \
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}
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#define DEFINE_PROP_UINT8(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
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#define DEFINE_PROP_UINT16(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
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#define DEFINE_PROP_UINT32(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
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#define DEFINE_PROP_INT32(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_int32, int32_t)
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#define DEFINE_PROP_UINT64(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
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#define DEFINE_PROP_HEX8(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex8, uint8_t)
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#define DEFINE_PROP_HEX32(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex32, uint32_t)
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#define DEFINE_PROP_HEX64(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex64, uint64_t)
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#define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \
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DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_pci_devfn, uint32_t)
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#define DEFINE_PROP_PTR(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, void*)
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#define DEFINE_PROP_CHR(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_chr, CharDriverState*)
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#define DEFINE_PROP_STRING(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
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#define DEFINE_PROP_NETDEV(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, VLANClientState*)
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#define DEFINE_PROP_VLAN(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, VLANState*)
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#define DEFINE_PROP_DRIVE(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockDriverState *)
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#define DEFINE_PROP_MACADDR(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
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#define DEFINE_PROP_END_OF_LIST() \
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{}
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/* Set properties between creation and init. */
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void *qdev_get_prop_ptr(DeviceState *dev, Property *prop);
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int qdev_prop_exists(DeviceState *dev, const char *name);
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int qdev_prop_parse(DeviceState *dev, const char *name, const char *value);
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void qdev_prop_set(DeviceState *dev, const char *name, void *src, enum PropertyType type);
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void qdev_prop_set_bit(DeviceState *dev, const char *name, bool value);
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void qdev_prop_set_uint8(DeviceState *dev, const char *name, uint8_t value);
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void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
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void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
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void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
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void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
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void qdev_prop_set_string(DeviceState *dev, const char *name, char *value);
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void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value);
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void qdev_prop_set_netdev(DeviceState *dev, const char *name, VLANClientState *value);
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void qdev_prop_set_vlan(DeviceState *dev, const char *name, VLANState *value);
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int qdev_prop_set_drive(DeviceState *dev, const char *name, BlockDriverState *value) QEMU_WARN_UNUSED_RESULT;
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void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name, BlockDriverState *value);
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void qdev_prop_set_macaddr(DeviceState *dev, const char *name, uint8_t *value);
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/* FIXME: Remove opaque pointer properties. */
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void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
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void qdev_prop_set_defaults(DeviceState *dev, Property *props);
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void qdev_prop_register_global_list(GlobalProperty *props);
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void qdev_prop_set_globals(DeviceState *dev);
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void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
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Property *prop, const char *value);
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static inline const char *qdev_fw_name(DeviceState *dev)
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{
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return dev->info->fw_name ? : dev->info->alias ? : dev->info->name;
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}
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char *qdev_get_fw_dev_path(DeviceState *dev);
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/* This is a nasty hack to allow passing a NULL bus to qdev_create. */
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extern struct BusInfo system_bus_info;
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/**
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* @qdev_ref
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*
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* Increase the reference count of a device. A device cannot be freed as long
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* as its reference count is greater than zero.
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*
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* @dev - the device
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*/
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void qdev_ref(DeviceState *dev);
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/**
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* @qdef_unref
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*
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* Decrease the reference count of a device. A device cannot be freed as long
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* as its reference count is greater than zero.
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*
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* @dev - the device
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*/
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void qdev_unref(DeviceState *dev);
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/**
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* @qdev_property_add - add a new property to a device
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*
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* @dev - the device to add a property to
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*
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* @name - the name of the property. This can contain any character except for
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* a forward slash. In general, you should use hyphens '-' instead of
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* underscores '_' when naming properties.
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*
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* @type - the type name of the property. This namespace is pretty loosely
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* defined. Sub namespaces are constructed by using a prefix and then
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* to angle brackets. For instance, the type 'virtio-net-pci' in the
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* 'link' namespace would be 'link<virtio-net-pci>'.
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*
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* @get - the getter to be called to read a property. If this is NULL, then
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* the property cannot be read.
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*
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* @set - the setter to be called to write a property. If this is NULL,
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* then the property cannot be written.
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*
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* @release - called when the property is removed from the device. This is
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* meant to allow a property to free its opaque upon device
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* destruction. This may be NULL.
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*
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* @opaque - an opaque pointer to pass to the callbacks for the property
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*
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* @errp - returns an error if this function fails
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*/
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void qdev_property_add(DeviceState *dev, const char *name, const char *type,
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DevicePropertyAccessor *get, DevicePropertyAccessor *set,
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DevicePropertyRelease *release,
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void *opaque, Error **errp);
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/**
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* @qdev_property_get - reads a property from a device
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*
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* @dev - the device
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*
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* @v - the visitor that will receive the property value. This should be an
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* Output visitor and the data will be written with @name as the name.
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @errp - returns an error if this function fails
|
|
*/
|
|
void qdev_property_get(DeviceState *dev, Visitor *v, const char *name,
|
|
Error **errp);
|
|
|
|
/**
|
|
* @qdev_property_set - writes a property to a device
|
|
*
|
|
* @dev - the device
|
|
*
|
|
* @v - the visitor that will be used to write the property value. This should
|
|
* be an Input visitor and the data will be first read with @name as the
|
|
* name and then written as the property value.
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @errp - returns an error if this function fails
|
|
*/
|
|
void qdev_property_set(DeviceState *dev, Visitor *v, const char *name,
|
|
Error **errp);
|
|
|
|
/**
|
|
* @qdev_property_get_type - returns the type of a property
|
|
*
|
|
* @dev - the device
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @errp - returns an error if this function fails
|
|
*
|
|
* Returns:
|
|
* The type name of the property.
|
|
*/
|
|
const char *qdev_property_get_type(DeviceState *dev, const char *name,
|
|
Error **errp);
|
|
|
|
/**
|
|
* @qdev_property_add_legacy - add a legacy @Property to a device
|
|
*
|
|
* DO NOT USE THIS IN NEW CODE!
|
|
*/
|
|
void qdev_property_add_legacy(DeviceState *dev, Property *prop, Error **errp);
|
|
|
|
/**
|
|
* @qdev_get_root - returns the root device of the composition tree
|
|
*
|
|
* Returns:
|
|
* The root of the composition tree.
|
|
*/
|
|
DeviceState *qdev_get_root(void);
|
|
|
|
/**
|
|
* @qdev_get_canonical_path - returns the canonical path for a device. This
|
|
* is the path within the composition tree starting from the root.
|
|
*
|
|
* Returns:
|
|
* The canonical path in the composition tree.
|
|
*/
|
|
gchar *qdev_get_canonical_path(DeviceState *dev);
|
|
|
|
/**
|
|
* @qdev_resolve_path - resolves a path returning a device
|
|
*
|
|
* There are two types of supported paths--absolute paths and partial paths.
|
|
*
|
|
* Absolute paths are derived from the root device and can follow child<> or
|
|
* link<> properties. Since they can follow link<> properties, they can be
|
|
* arbitrarily long. Absolute paths look like absolute filenames and are
|
|
* prefixed with a leading slash.
|
|
*
|
|
* Partial paths look like relative filenames. They do not begin with a
|
|
* prefix. The matching rules for partial paths are subtle but designed to make
|
|
* specifying devices easy. At each level of the composition tree, the partial
|
|
* path is matched as an absolute path. The first match is not returned. At
|
|
* least two matches are searched for. A successful result is only returned if
|
|
* only one match is founded. If more than one match is found, a flag is
|
|
* return to indicate that the match was ambiguous.
|
|
*
|
|
* @path - the path to resolve
|
|
*
|
|
* @ambiguous - returns true if the path resolution failed because of an
|
|
* ambiguous match
|
|
*
|
|
* Returns:
|
|
* The matched device or NULL on path lookup failure.
|
|
*/
|
|
DeviceState *qdev_resolve_path(const char *path, bool *ambiguous);
|
|
|
|
/**
|
|
* @qdev_property_add_child - Add a child property to a device
|
|
*
|
|
* Child properties form the composition tree. All devices need to be a child
|
|
* of another device. Devices can only be a child of one device.
|
|
*
|
|
* There is no way for a child to determine what its parent is. It is not
|
|
* a bidirectional relationship. This is by design.
|
|
*
|
|
* @dev - the device to add a property to
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @child - the child device
|
|
*
|
|
* @errp - if an error occurs, a pointer to an area to store the area
|
|
*/
|
|
void qdev_property_add_child(DeviceState *dev, const char *name,
|
|
DeviceState *child, Error **errp);
|
|
|
|
/**
|
|
* @qdev_property_add_link - Add a link property to a device
|
|
*
|
|
* Links establish relationships between devices. Links are unidirectional
|
|
* although two links can be combined to form a bidirectional relationship
|
|
* between devices.
|
|
*
|
|
* Links form the graph in the device model.
|
|
*
|
|
* @dev - the device to add a property to
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @type - the qdev type of the link
|
|
*
|
|
* @child - a pointer to where the link device reference is stored
|
|
*
|
|
* @errp - if an error occurs, a pointer to an area to store the area
|
|
*/
|
|
void qdev_property_add_link(DeviceState *dev, const char *name,
|
|
const char *type, DeviceState **child,
|
|
Error **errp);
|
|
|
|
/**
|
|
* @qdev_property_add_str
|
|
*
|
|
* Add a string property using getters/setters. This function will add a
|
|
* property of type 'string'.
|
|
*
|
|
* @dev - the device to add a property to
|
|
*
|
|
* @name - the name of the property
|
|
*
|
|
* @get - the getter or NULL if the property is write-only. This function must
|
|
* return a string to be freed by @g_free().
|
|
*
|
|
* @set - the setter or NULL if the property is read-only
|
|
*
|
|
* @errp - if an error occurs, a pointer to an area to store the error
|
|
*/
|
|
void qdev_property_add_str(DeviceState *dev, const char *name,
|
|
char *(*get)(DeviceState *, Error **),
|
|
void (*set)(DeviceState *, const char *, Error **),
|
|
Error **errp);
|
|
|
|
/**
|
|
* @qdev_get_type
|
|
*
|
|
* Returns the string representation of the type of this object.
|
|
*
|
|
* @dev - the device
|
|
*
|
|
* @errp - if an error occurs, a pointer to an area to store the error
|
|
*
|
|
* Returns: a string representing the type. This must be freed by the caller
|
|
* with g_free().
|
|
*/
|
|
char *qdev_get_type(DeviceState *dev, Error **errp);
|
|
|
|
#endif
|