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, 17 insertions, 4 deletions

diff --git a/hw/syborg_serial.c b/hw/syborg_serial.c
index f430508018..f69342154a 100644
--- a/hw/syborg_serial.c
+++ b/hw/syborg_serial.c
@@ -59,7 +59,7 @@ enum {
 typedef struct {
     SysBusDevice busdev;
     uint32_t int_enable;
-    int fifo_size;
+    uint32_t fifo_size;
     uint32_t *read_fifo;
     int read_pos;
     int read_count;
@@ -329,7 +329,6 @@ static void syborg_serial_init(SysBusDevice *dev)
         qemu_chr_add_handlers(s->chr, syborg_serial_can_receive,
                               syborg_serial_receive, syborg_serial_event, s);
     }
-    s->fifo_size = qdev_get_prop_int(&dev->qdev, "fifo-size", 16);
     if (s->fifo_size <= 0) {
         fprintf(stderr, "syborg_serial: fifo too small\n");
         s->fifo_size = 16;
@@ -340,10 +339,24 @@ static void syborg_serial_init(SysBusDevice *dev)
                     syborg_serial_save, syborg_serial_load, s);
 }
 
+static SysBusDeviceInfo syborg_serial_info = {
+    .init = syborg_serial_init,
+    .qdev.name  = "syborg,serial",
+    .qdev.size  = sizeof(SyborgSerialState),
+    .qdev.props = (Property[]) {
+        {
+            .name   = "fifo-size",
+            .info   = &qdev_prop_uint32,
+            .offset = offsetof(SyborgSerialState, fifo_size),
+            .defval = (uint32_t[]) { 16 },
+        },
+        {/* end of list */}
+    }
+};
+
 static void syborg_serial_register_devices(void)
 {
-    sysbus_register_dev("syborg,serial", sizeof(SyborgSerialState),
-                        syborg_serial_init);
+    sysbus_register_withprop(&syborg_serial_info);
 }
 
 device_init(syborg_serial_register_devices)