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iothread: add "iothread" qdev property type

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Add a "iothread" qdev property type so devices can be hooked up to an
IOThread from the comand-line:

  qemu -object iothread,id=iothread0 \
       -device some-device,x-iothread=iothread0

Note that Paolo Bonzini <pbonzini@redhat.com> has suggested using QOM
links instead.  This way the relationship between the objects is
reflected in QOM.  There are currently shortcomings of
object_property_add_link() which prevent this use case.  I will attempt
to fix them and move to QOM links in a separate series.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-03-03 11:30:07 +01:00
parent 7d1de46448
commit 6e4a876b43
2 changed files with 54 additions and 0 deletions
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51
hw/core/qdev-properties-system.c
View file

@ -18,6 +18,7 @@
#include "net/hub.h"
#include "qapi/visitor.h"
#include "sysemu/char.h"
#include "sysemu/iothread.h"
static void get_pointer(Object *obj, Visitor *v, Property *prop,
char *(*print)(void *ptr),
@ -385,6 +386,56 @@ void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
nd->instantiated = 1;
}
/* --- iothread --- */
static char *print_iothread(void *ptr)
{
return iothread_get_id(ptr);
}
static int parse_iothread(DeviceState *dev, const char *str, void **ptr)
{
IOThread *iothread;
iothread = iothread_find(str);
if (!iothread) {
return -ENOENT;
}
object_ref(OBJECT(iothread));
*ptr = iothread;
return 0;
}
static void get_iothread(Object *obj, struct Visitor *v, void *opaque,
const char *name, Error **errp)
{
get_pointer(obj, v, opaque, print_iothread, name, errp);
}
static void set_iothread(Object *obj, struct Visitor *v, void *opaque,
const char *name, Error **errp)
{
set_pointer(obj, v, opaque, parse_iothread, name, errp);
}
static void release_iothread(Object *obj, const char *name, void *opaque)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
IOThread **ptr = qdev_get_prop_ptr(dev, prop);
if (*ptr) {
object_unref(OBJECT(*ptr));
}
}
PropertyInfo qdev_prop_iothread = {
.name = "iothread",
.get = get_iothread,
.set = set_iothread,
.release = release_iothread,
};
static int qdev_add_one_global(QemuOpts *opts, void *opaque)
{
GlobalProperty *g;