On 05/21/2012 04:13 PM, Jan Kiszka wrote:
> Add a PCI IRQ path discovery function that walks from a given device to
> the host bridge, returning the IRQ number that is reported to the
> attached interrupt controller. For this purpose, another PCI bridge
> callback function is introduced: map_host_irq. It is so far only
> implemented by the PIIX3, other host bridges can be added later on as
> required.
>
> Will be used for KVM PCI device assignment.
This is similar to the memory API, which converts a memory region
hierarchy to a flat list and fires notifiers whenever it changes.
> +int pci_device_get_host_irq(PCIDevice *pci_dev, int irq_num)
> +{
> + PCIBus *bus;
> +
> + for (;;) {
> + bus = pci_dev->bus;
> + irq_num = bus->map_irq(pci_dev, irq_num);
> + if (bus->map_host_irq) {
> + break;
> + }
> + pci_dev = bus->parent_dev;
> + assert(pci_dev);
> + }
> + return bus->map_host_irq(bus->irq_opaque, irq_num);
> +}
> +
My personal preference is to avoid infinite loops with breaks, I'd write
this as a do/while (without the assert). Or maybe supply all buses with
a default map_host_irq that recurses back into
pci_device_get_host_irq(). But this is not an objection to the patch.
--
error compiling committee.c: too many arguments to function
