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, 25 insertions, 7 deletions

diff --git a/hw/xilinx_timer.c b/hw/xilinx_timer.c
index a64ad2d..efb6a04 100644
--- a/hw/xilinx_timer.c
+++ b/hw/xilinx_timer.c
@@ -61,7 +61,8 @@ struct timerblock
 {
     SysBusDevice busdev;
     qemu_irq irq;
-    unsigned int nr_timers;
+    uint32_t nr_timers;
+    uint32_t freq_hz;
     struct xlx_timer *timers;
 };
 
@@ -192,14 +193,12 @@ static void xilinx_timer_init(SysBusDevice *dev)
 {
     struct timerblock *t = FROM_SYSBUS(typeof (*t), dev);
     unsigned int i;
-    int timer_regs, freq_hz;
+    int timer_regs;
 
     /* All timers share a single irq line.  */
     sysbus_init_irq(dev, &t->irq);
 
     /* Init all the ptimers.  */
-    freq_hz = qdev_get_prop_int(&dev->qdev, "frequency", 2);
-    t->nr_timers = qdev_get_prop_int(&dev->qdev, "nr-timers", 2);
     t->timers = qemu_mallocz(sizeof t->timers[0] * t->nr_timers);
     for (i = 0; i < t->nr_timers; i++) {
         struct xlx_timer *xt = &t->timers[i];
@@ -208,17 +207,36 @@ static void xilinx_timer_init(SysBusDevice *dev)
         xt->nr = i;
         xt->bh = qemu_bh_new(timer_hit, xt);
         xt->ptimer = ptimer_init(xt->bh);
-        ptimer_set_freq(xt->ptimer, freq_hz);
+        ptimer_set_freq(xt->ptimer, t->freq_hz);
     }
 
     timer_regs = cpu_register_io_memory(timer_read, timer_write, t);
     sysbus_init_mmio(dev, R_MAX * 4 * t->nr_timers, timer_regs);
 }
 
+static SysBusDeviceInfo xilinx_timer_info = {
+    .init = xilinx_timer_init,
+    .qdev.name  = "xilinx,timer",
+    .qdev.size  = sizeof(struct timerblock),
+    .qdev.props = (Property[]) {
+        {
+            .name   = "frequency",
+            .info   = &qdev_prop_uint32,
+            .offset = offsetof(struct timerblock, freq_hz),
+            .defval = (uint32_t[]) { 2 },
+        },{
+            .name   = "nr-timers",
+            .info   = &qdev_prop_uint32,
+            .offset = offsetof(struct timerblock, nr_timers),
+            .defval = (uint32_t[]) { 2 },
+        },
+        {/* end of list */}
+    }
+};
+
 static void xilinx_timer_register(void)
 {
-    sysbus_register_dev("xilinx,timer", sizeof (struct timerblock),
-                        xilinx_timer_init);
+    sysbus_register_withprop(&xilinx_timer_info);
 }
 
 device_init(xilinx_timer_register)