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qdev: rework device properties.

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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>
This commit is contained in:
Gerd Hoffmann 2009-07-15 13:43:31 +02:00 • committed by Anthony Liguori
parent f114784f69
commit ee6847d19b
47 changed files with 921 additions and 391 deletions
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11
hw/syborg_timer.c
View file

@ -209,7 +209,6 @@ static void syborg_timer_init(SysBusDevice *dev)
QEMUBH *bh;
int iomemtype;
s->freq = qdev_get_prop_int(&dev->qdev, "frequency", 0);
if (s->freq == 0) {
fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
exit(1);
@ -230,9 +229,13 @@ static SysBusDeviceInfo syborg_timer_info = {
.init = syborg_timer_init,
.qdev.name = "syborg,timer",
.qdev.size = sizeof(SyborgTimerState),
.qdev.props = (DevicePropList[]) {
{.name = "frequency", .type = PROP_TYPE_INT},
{.name = NULL}
.qdev.props = (Property[]) {
{
.name = "frequency",
.info = &qdev_prop_uint32,
.offset = offsetof(SyborgTimerState, freq),
},
{/* end of list */}
}
};