On Thu, Jan 28, 2016 at 03:23:37PM +0100, Arnd Bergmann wrote: > 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. I think the best way to handle this is through Matthew's series (below), in the interim a callback in arch code would do, we will clean it up when Matthew's series goes upstream, it should not take too long. http://www.spinics.net/lists/linux-pci/msg45950.html Thanks, Lorenzo -- 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
