Re: [Qemu-devel] [PATCH 07/12] qdev-core: isolate reset register/unregister code

[Eduardo Habkost <ehabkost@redhat.com>]

On Wed, Oct 17, 2012 at 01:08:23PM -0500, Anthony Liguori wrote:
> Eduardo Habkost <ehabkost@redhat.com> writes:
> 
> > The reset register/unregister code is specific to qemu-system-*, so
> > isolate it so it can be moved to qdev-system.c.
> >
> > Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> > ---
> >  hw/qdev-core.c | 24 ++++++++++++++++++------
> >  1 file changed, 18 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/qdev-core.c b/hw/qdev-core.c
> > index af0af52..a105679 100644
> > --- a/hw/qdev-core.c
> > +++ b/hw/qdev-core.c
> > @@ -47,6 +47,21 @@ void GCC_WEAK qdev_finalize_vmstate(DeviceState *dev)
> >  {
> >  }
> >  
> > +static void qbus_register_reset(BusState *bus)
> > +{
> > +    if (bus != sysbus_get_default()) {
> > +        /* TODO: once all bus devices are qdevified,
> > +           only reset handler for main_system_bus should be registered here. */
> > +        qemu_register_reset(qbus_reset_all_fn, bus);
> > +    }
> > +}
> > +
> > +static void qbus_unregister_reset(BusState *bus)
> > +{
> > +    assert(bus != sysbus_get_default()); /* main_system_bus is never freed */
> > +    qemu_unregister_reset(qbus_reset_all_fn, bus);
> > +}
> > +
> 
> Again, I'd suggest stubbing out qemu_[un]register_reset instead of
> trying to cope with it's users.

I was going to implement it the way you suggested. But then I noticed
that I _ *-user will need to request the devices to be reset once, too
(even if the only devices available are the CPU objects).

On the next version, I will move the reset-function list from vl.c to
qdev-core.c. Code that uses qdev will need to take care of calling
qemu_devices_reset() eventually (qemu-system does that on vl.c *-user
will need to that somewhere else).

> 
> Regards,
> 
> Anthony Liguori
> 
> >  const char *qdev_fw_name(DeviceState *dev)
> >  {
> >      DeviceClass *dc = DEVICE_GET_CLASS(dev);
> > @@ -355,10 +370,8 @@ static void qbus_realize(BusState *bus)
> >          QLIST_INSERT_HEAD(&bus->parent->child_bus, bus, sibling);
> >          bus->parent->num_child_bus++;
> >          object_property_add_child(OBJECT(bus->parent), bus->name, OBJECT(bus), NULL);
> > -    } else if (bus != sysbus_get_default()) {
> > -        /* TODO: once all bus devices are qdevified,
> > -           only reset handler for main_system_bus should be registered here. */
> > -        qemu_register_reset(qbus_reset_all_fn, bus);
> > +    } else {
> > +        qbus_register_reset(bus);
> >      }
> >  }
> >  
> > @@ -692,8 +705,7 @@ static void qbus_finalize(Object *obj)
> >          QLIST_REMOVE(bus, sibling);
> >          bus->parent->num_child_bus--;
> >      } else {
> > -        assert(bus != sysbus_get_default()); /* main_system_bus is never freed */
> > -        qemu_unregister_reset(qbus_reset_all_fn, bus);
> > +        qbus_unregister_reset(bus);
> >      }
> >      g_free((char *)bus->name);
> >  }
> > -- 
> > 1.7.11.7
> 

-- 
Eduardo