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qemu/include/hw/qdev-properties.h
Paolo Bonzini d36f165d95 qdev: make properties array "const" 
Constify all accesses to qdev properties, except for the
ObjectPropertyAccessor itself.  This makes it possible to place them in
read-only memory, and also lets Rust bindings switch from "static mut"
arrays to "static"; which is advantageous, because mutable statics are
highly discouraged.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-11-05 14:18:14 +01:00

268 lines
11 KiB
C
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#ifndef QEMU_QDEV_PROPERTIES_H
#define QEMU_QDEV_PROPERTIES_H
#include "hw/qdev-core.h"
/**
* Property:
* @set_default: true if the default value should be set from @defval,
* in which case @info->set_default_value must not be NULL
* (if false then no default value is set by the property system
* and the field retains whatever value it was given by instance_init).
* @defval: default value for the property. This is used only if @set_default
* is true.
*/
struct Property {
const char *name;
const PropertyInfo *info;
ptrdiff_t offset;
uint8_t bitnr;
uint64_t bitmask;
bool set_default;
union {
int64_t i;
uint64_t u;
} defval;
int arrayoffset;
const PropertyInfo *arrayinfo;
int arrayfieldsize;
const char *link_type;
};
struct PropertyInfo {
const char *name;
const char *description;
const QEnumLookup *enum_table;
bool realized_set_allowed; /* allow setting property on realized device */
int (*print)(Object *obj, Property *prop, char *dest, size_t len);
void (*set_default_value)(ObjectProperty *op, const Property *prop);
ObjectProperty *(*create)(ObjectClass *oc, const char *name,
const Property *prop);
ObjectPropertyAccessor *get;
ObjectPropertyAccessor *set;
ObjectPropertyRelease *release;
};
/*** qdev-properties.c ***/
extern const PropertyInfo qdev_prop_bit;
extern const PropertyInfo qdev_prop_bit64;
extern const PropertyInfo qdev_prop_bool;
extern const PropertyInfo qdev_prop_enum;
extern const PropertyInfo qdev_prop_uint8;
extern const PropertyInfo qdev_prop_uint16;
extern const PropertyInfo qdev_prop_uint32;
extern const PropertyInfo qdev_prop_int32;
extern const PropertyInfo qdev_prop_uint64;
extern const PropertyInfo qdev_prop_uint64_checkmask;
extern const PropertyInfo qdev_prop_int64;
extern const PropertyInfo qdev_prop_size;
extern const PropertyInfo qdev_prop_string;
extern const PropertyInfo qdev_prop_on_off_auto;
extern const PropertyInfo qdev_prop_size32;
extern const PropertyInfo qdev_prop_array;
extern const PropertyInfo qdev_prop_link;
#define DEFINE_PROP(_name, _state, _field, _prop, _type, ...) { \
.name = (_name), \
.info = &(_prop), \
.offset = offsetof(_state, _field) \
+ type_check(_type, typeof_field(_state, _field)), \
__VA_ARGS__ \
}
#define DEFINE_PROP_SIGNED(_name, _state, _field, _defval, _prop, _type) \
DEFINE_PROP(_name, _state, _field, _prop, _type, \
.set_default = true, \
.defval.i = (_type)_defval)
#define DEFINE_PROP_SIGNED_NODEFAULT(_name, _state, _field, _prop, _type) \
DEFINE_PROP(_name, _state, _field, _prop, _type)
#define DEFINE_PROP_BIT(_name, _state, _field, _bit, _defval) \
DEFINE_PROP(_name, _state, _field, qdev_prop_bit, uint32_t, \
.bitnr = (_bit), \
.set_default = true, \
.defval.u = (bool)_defval)
#define DEFINE_PROP_UNSIGNED(_name, _state, _field, _defval, _prop, _type) \
DEFINE_PROP(_name, _state, _field, _prop, _type, \
.set_default = true, \
.defval.u = (_type)_defval)
#define DEFINE_PROP_UNSIGNED_NODEFAULT(_name, _state, _field, _prop, _type) \
DEFINE_PROP(_name, _state, _field, _prop, _type)
#define DEFINE_PROP_BIT64(_name, _state, _field, _bit, _defval) \
DEFINE_PROP(_name, _state, _field, qdev_prop_bit64, uint64_t, \
.bitnr = (_bit), \
.set_default = true, \
.defval.u = (bool)_defval)
#define DEFINE_PROP_BOOL(_name, _state, _field, _defval) \
DEFINE_PROP(_name, _state, _field, qdev_prop_bool, bool, \
.set_default = true, \
.defval.u = (bool)_defval)
/**
* The DEFINE_PROP_UINT64_CHECKMASK macro checks a user-supplied value
* against corresponding bitmask, rejects the value if it violates.
* The default value is set in instance_init().
*/
#define DEFINE_PROP_UINT64_CHECKMASK(_name, _state, _field, _bitmask) \
DEFINE_PROP(_name, _state, _field, qdev_prop_uint64_checkmask, uint64_t, \
.bitmask = (_bitmask), \
.set_default = false)
/**
* DEFINE_PROP_ARRAY:
* @_name: name of the array
* @_state: name of the device state structure type
* @_field: uint32_t field in @_state to hold the array length
* @_arrayfield: field in @_state (of type '@_arraytype *') which
* will point to the array
* @_arrayprop: PropertyInfo defining what property the array elements have
* @_arraytype: C type of the array elements
*
* Define device properties for a variable-length array _name. The array is
* represented as a list in the visitor interface.
*
* @_arraytype is required to be movable with memcpy().
*
* When the array property is set, the @_field member of the device
* struct is set to the array length, and @_arrayfield is set to point
* to the memory allocated for the array.
*
* It is the responsibility of the device deinit code to free the
* @_arrayfield memory.
*/
#define DEFINE_PROP_ARRAY(_name, _state, _field, \
_arrayfield, _arrayprop, _arraytype) \
DEFINE_PROP(_name, _state, _field, qdev_prop_array, uint32_t, \
.set_default = true, \
.defval.u = 0, \
.arrayinfo = &(_arrayprop), \
.arrayfieldsize = sizeof(_arraytype), \
.arrayoffset = offsetof(_state, _arrayfield))
#define DEFINE_PROP_LINK(_name, _state, _field, _type, _ptr_type) \
DEFINE_PROP(_name, _state, _field, qdev_prop_link, _ptr_type, \
.link_type = _type)
#define DEFINE_PROP_UINT8(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
#define DEFINE_PROP_UINT16(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
#define DEFINE_PROP_UINT32(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
#define DEFINE_PROP_INT32(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int32, int32_t)
#define DEFINE_PROP_UINT64(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
#define DEFINE_PROP_INT64(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int64, int64_t)
#define DEFINE_PROP_SIZE(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_size, uint64_t)
#define DEFINE_PROP_STRING(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
#define DEFINE_PROP_ON_OFF_AUTO(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_on_off_auto, OnOffAuto)
#define DEFINE_PROP_SIZE32(_n, _s, _f, _d) \
DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_size32, uint32_t)
#define DEFINE_PROP_END_OF_LIST() \
{}
/*
* Set properties between creation and realization.
*
* Returns: %true on success, %false on error.
*/
bool qdev_prop_set_drive_err(DeviceState *dev, const char *name,
BlockBackend *value, Error **errp);
/*
* Set properties between creation and realization.
* @value must be valid. Each property may be set at most once.
*/
void qdev_prop_set_bit(DeviceState *dev, const char *name, bool value);
void qdev_prop_set_uint8(DeviceState *dev, const char *name, uint8_t value);
void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
void qdev_prop_set_string(DeviceState *dev, const char *name, const char *value);
void qdev_prop_set_chr(DeviceState *dev, const char *name, Chardev *value);
void qdev_prop_set_netdev(DeviceState *dev, const char *name, NetClientState *value);
void qdev_prop_set_drive(DeviceState *dev, const char *name,
BlockBackend *value);
void qdev_prop_set_macaddr(DeviceState *dev, const char *name,
const uint8_t *value);
void qdev_prop_set_enum(DeviceState *dev, const char *name, int value);
/* Takes ownership of @values */
void qdev_prop_set_array(DeviceState *dev, const char *name, QList *values);
void *object_field_prop_ptr(Object *obj, Property *prop);
void qdev_prop_register_global(GlobalProperty *prop);
const GlobalProperty *qdev_find_global_prop(Object *obj,
const char *name);
int qdev_prop_check_globals(void);
void qdev_prop_set_globals(DeviceState *dev);
void error_set_from_qdev_prop_error(Error **errp, int ret, Object *obj,
const char *name, const char *value);
/**
* qdev_property_add_static:
* @dev: Device to add the property to.
* @prop: The qdev property definition.
*
* Add a static QOM property to @dev for qdev property @prop.
* On error, store error in @errp. Static properties access data in a struct.
* The type of the QOM property is derived from prop->info.
*/
void qdev_property_add_static(DeviceState *dev, const Property *prop);
/**
* qdev_alias_all_properties: Create aliases on source for all target properties
* @target: Device which has properties to be aliased
* @source: Object to add alias properties to
*
* Add alias properties to the @source object for all properties on the @target
* DeviceState.
*
* This is useful when @target is an internal implementation object
* owned by @source, and you want to expose all the properties of that
* implementation object as properties on the @source object so that users
* of @source can set them.
*/
void qdev_alias_all_properties(DeviceState *target, Object *source);
/**
* @qdev_prop_set_after_realize:
* @dev: device
* @name: name of property
* @errp: indirect pointer to Error to be set
* Set the Error object to report that an attempt was made to set a property
* on a device after it has already been realized. This is a utility function
* which allows property-setter functions to easily report the error in
* a friendly format identifying both the device and the property.
*/
void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
Error **errp);
/**
* qdev_prop_allow_set_link_before_realize:
*
* Set the #Error object if an attempt is made to set the link after realize.
* This function should be used as the check() argument to
* object_property_add_link().
*/
void qdev_prop_allow_set_link_before_realize(const Object *obj,
const char *name,
Object *val, Error **errp);
#endif
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