On Thursday 28 January 2016 14:18:15 Bharat Kumar Gogada wrote: > > > > I see. In the upstream code you seem to do it in > > pcibios_setup_bus_devices(), while arm64 and powerpc do it in > > pcibios_add_device(). > > > No that function is not getting called with generic API's, its getting called with pcibios_init flow which is tightly bound with struct pci_controller microblaze specific structure. So I added pcibios_add_device in pci-common.c. Ok > > > May be we can add similar on arm and test out, but we might need some > > > cleanup in arch/arm/kernel/bios32.c > > > > I think that would still just be a half-baked solution. This should really be fully > > automatic. We could do it in the __weak > > pcibios_add_device() for all architectures that don't override it when the bus > > was probed from DT, or we could do it in pci_read_irq(). > When will pci_read_irq() call get invoked ? This is called early on when a device gets created in pci_setup_device(), so platforms can still override the value later. The idea here is that normally a BIOS stores the interrupt number in the PCI_INTERRUPT_LINE config space byte, and we just read it from there. Generally speaking though, for non-PC systems we tend to not have a BIOS that writes these values to start with, and any values stored in here have no meaning in combination with SPARSE_IRQ and/or IRQ_DOMAINS because the bootloader or BIOS doesn't know what IRQ number will refer to hardware IRQ line in Linux. Arnd -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
