qdev: rework device properties.

This patch is a major overhaul of the device properties.  The properties
are saved directly in the device state struct now, the linked list of
property values is gone.

Advantages:
  * We don't have to maintain the list with the property values.
  * The value in the property list and the value actually used by
    the device can't go out of sync any more (used to happen for
    the pci.devfn == -1 case) because there is only one place where
    the value is stored.
  * A record describing the property is required now, you can't set
    random properties any more.

There are bus-specific and device-specific properties.  The former
should be used for properties common to all bus drivers.  Typical
use case is bus addressing, i.e. pci.devfn and i2c.address.

Properties have a PropertyInfo struct attached with name, size and
function pointers to parse and print properties.  A few common property
types have PropertyInfos defined in qdev-properties.c.  Drivers are free
to implement their own very special property parsers if needed.

Properties can have default values.  If unset they are zero-filled.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 15 insertions, 3 deletions

diff --git a/hw/etraxfs_pic.c b/hw/etraxfs_pic.c
index 1c67427957..e6272189bb 100644
--- a/hw/etraxfs_pic.c
+++ b/hw/etraxfs_pic.c
@@ -140,7 +140,6 @@ static void etraxfs_pic_init(SysBusDevice *dev)
     struct etrax_pic *s = FROM_SYSBUS(typeof (*s), dev);
     int intr_vect_regs;
 
-    s->interrupt_vector = qdev_get_prop_ptr(&dev->qdev, "interrupt_vector");
     qdev_init_gpio_in(&dev->qdev, irq_handler, 32);
     sysbus_init_irq(dev, &s->parent_irq);
     sysbus_init_irq(dev, &s->parent_nmi);
@@ -149,10 +148,23 @@ static void etraxfs_pic_init(SysBusDevice *dev)
     sysbus_init_mmio(dev, R_MAX * 4, intr_vect_regs);
 }
 
+static SysBusDeviceInfo etraxfs_pic_info = {
+    .init = etraxfs_pic_init,
+    .qdev.name  = "etraxfs,pic",
+    .qdev.size  = sizeof(struct etrax_pic),
+    .qdev.props = (Property[]) {
+        {
+            .name   = "interrupt_vector",
+            .info   = &qdev_prop_ptr,
+            .offset = offsetof(struct etrax_pic, interrupt_vector),
+        },
+        {/* end of list */}
+    }
+};
+
 static void etraxfs_pic_register(void)
 {
-    sysbus_register_dev("etraxfs,pic", sizeof (struct etrax_pic),
-                        etraxfs_pic_init);
+    sysbus_register_withprop(&etraxfs_pic_info);
 }
 
 device_init(etraxfs_pic_register)