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, 8 insertions, 5 deletions

diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c
index a0678b5dbc..7633905af8 100644
--- a/hw/sparc32_dma.c
+++ b/hw/sparc32_dma.c
@@ -252,7 +252,7 @@ void *sparc32_dma_init(target_phys_addr_t daddr, qemu_irq parent_irq,
     DMAState *d;
 
     dev = qdev_create(NULL, "sparc32_dma");
-    qdev_set_prop_ptr(dev, "iommu_opaque", iommu);
+    qdev_prop_set_ptr(dev, "iommu_opaque", iommu);
     qdev_init(dev);
     s = sysbus_from_qdev(dev);
     sysbus_connect_irq(s, 0, parent_irq);
@@ -271,7 +271,6 @@ static void sparc32_dma_init1(SysBusDevice *dev)
     int dma_io_memory;
 
     sysbus_init_irq(dev, &s->irq);
-    s->iommu = qdev_get_prop_ptr(&dev->qdev, "iommu_opaque");
 
     dma_io_memory = cpu_register_io_memory(dma_mem_read, dma_mem_write, s);
     sysbus_init_mmio(dev, DMA_SIZE, dma_io_memory);
@@ -286,9 +285,13 @@ static SysBusDeviceInfo sparc32_dma_info = {
     .init = sparc32_dma_init1,
     .qdev.name  = "sparc32_dma",
     .qdev.size  = sizeof(DMAState),
-    .qdev.props = (DevicePropList[]) {
-        {.name = "iommu_opaque", .type = PROP_TYPE_PTR},
-        {.name = NULL}
+    .qdev.props = (Property[]) {
+        {
+            .name = "iommu_opaque",
+            .info = &qdev_prop_ptr,
+            .offset = offsetof(DMAState, iommu),
+        },
+        {/* end of property list */}
     }
 };