From 91e5615984c1fd5674caad343e750bb5ecd17995 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Fri, 19 Oct 2012 16:43:28 -0400 Subject: pci: introduce pci_swizzle_map_irq_fn() for standardized interrupt pin swizzle Introduce pci_swizzle_map_irq_fn() for interrupt pin swizzle which is standardized. PCI bridge swizzle is common logic, by introducing this function duplicated swizzle logic will be avoided later. [jbaron@redhat.com: drop opaque argument] Reviewed-by: Paolo Bonzini Signed-off-by: Isaku Yamahata Signed-off-by: Jason Baron Signed-off-by: Michael S. Tsirkin --- hw/pci.c | 18 ++++++++++++++++++ hw/pci.h | 2 ++ 2 files changed, 20 insertions(+) (limited to 'hw') diff --git a/hw/pci.c b/hw/pci.c index 82c971a17d..63b1857f88 100644 --- a/hw/pci.c +++ b/hw/pci.c @@ -1155,6 +1155,24 @@ void pci_device_set_intx_routing_notifier(PCIDevice *dev, dev->intx_routing_notifier = notifier; } +/* + * PCI-to-PCI bridge specification + * 9.1: Interrupt routing. Table 9-1 + * + * the PCI Express Base Specification, Revision 2.1 + * 2.2.8.1: INTx interrutp signaling - Rules + * the Implementation Note + * Table 2-20 + */ +/* + * 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD + * 0-origin unlike PCI interrupt pin register. + */ +int pci_swizzle_map_irq_fn(PCIDevice *pci_dev, int pin) +{ + return (pin + PCI_SLOT(pci_dev->devfn)) % PCI_NUM_PINS; +} + /***********************************************************/ /* monitor info on PCI */ diff --git a/hw/pci.h b/hw/pci.h index a852941a5c..241c1d8905 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -318,6 +318,8 @@ void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq, pci_map_irq_fn map_irq, void *irq_opaque, int nirq); int pci_bus_get_irq_level(PCIBus *bus, int irq_num); void pci_bus_hotplug(PCIBus *bus, pci_hotplug_fn hotplug, DeviceState *dev); +/* 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD */ +int pci_swizzle_map_irq_fn(PCIDevice *pci_dev, int pin); PCIBus *pci_register_bus(DeviceState *parent, const char *name, pci_set_irq_fn set_irq, pci_map_irq_fn map_irq, void *irq_opaque, -- cgit v1.2.3