Re: [Qemu-devel] [PATCH v2 04/21] pci: introduce pci_swizzle_map_irq_fn() for standardized interrupt pin swizzle

[Paolo Bonzini <pbonzini@redhat.com>]

Il 09/10/2012 05:30, Jason Baron ha scritto:
> From: Isaku Yamahata <yamahata@valinux.co.jp>
> 
> 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]
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> Signed-off-by: Jason Baron <jbaron@redhat.com>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

> ---
>  hw/pci.c |   18 ++++++++++++++++++
>  hw/pci.h |    2 ++
>  2 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 85ebef6..c457d50 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -1121,6 +1121,24 @@ 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 4b6ab3d..397477e 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -316,6 +316,8 @@ 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,
>