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pci: Add pci_device_route_intx_to_irq

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Device assigned on KVM needs to know the mode
(enabled/inverted/disabled) and the IRQ number that a given device
triggers in the attached interrupt controller.

Add a PCI IRQ path discovery function that walks from a given device to
the host bridge, and gets this information.  For
this purpose, a host bridge callback function is introduced:
route_intx_to_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 and VFIO.

Based on patch by Jan Kiszka, with minor tweaks.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2012-07-19 17:11:47 +03:00
parent 7cf1b0fd95
commit 3afa9bb488
4 changed files with 51 additions and 0 deletions
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1
hw/pci_internals.h
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@ -19,6 +19,7 @@ struct PCIBus {
uint8_t devfn_min;
pci_set_irq_fn set_irq;
pci_map_irq_fn map_irq;
pci_route_irq_fn route_intx_to_irq;
pci_hotplug_fn hotplug;
DeviceState *hotplug_qdev;
void *irq_opaque;