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pci: Add INTx routing notifier

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This per-device notifier shall be triggered by any interrupt router
along the path of a device's legacy interrupt signal on routing changes.
For simplicity reasons and as this is a slow path anyway, no further
details on the routing changes are provided. Instead, the callback is
expected to use pci_device_route_intx_to_irq to check the effect of the
change.

Will be used by KVM PCI device assignment and VFIO.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jan Kiszka 2012-07-02 14:38:47 +02:00 • committed by Michael S. Tsirkin
parent 3afa9bb488
commit 0ae1625177
3 changed files with 32 additions and 0 deletions
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23
hw/pci.c
View file

@ -1086,6 +1086,29 @@ PCIINTxRoute pci_device_route_intx_to_irq(PCIDevice *dev, int pin)
return bus->route_intx_to_irq(bus->irq_opaque, pin);
}
void pci_bus_fire_intx_routing_notifier(PCIBus *bus)
{
PCIDevice *dev;
PCIBus *sec;
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
dev = bus->devices[i];
if (dev && dev->intx_routing_notifier) {
dev->intx_routing_notifier(dev);
}
QLIST_FOREACH(sec, &bus->child, sibling) {
pci_bus_fire_intx_routing_notifier(sec);
}
}
}
void pci_device_set_intx_routing_notifier(PCIDevice *dev,
PCIINTxRoutingNotifier notifier)
{
dev->intx_routing_notifier = notifier;
}
/***********************************************************/
/* monitor info on PCI */