On Wednesday 24 September 2014 23:34:04 Sunil Kovvuri wrote: > On Wed, Sep 24, 2014 at 9:36 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > On Wednesday 24 September 2014 17:37:45 Robert Richter wrote: > >> + compatible = "cavium,thunder-pcie"; > >> + device_type = "pci"; > >> + msi-parent = <&its>; > >> + bus-range = <0 255>; > >> + #size-cells = <2>; > >> + #address-cells = <3>; > >> + reg = <0x8480 0x00000000 0 0x10000000>; /* Configuration space */ > >> + ranges = <0x03000000 0x8010 0x00000000 0x8010 0x00000000 0x70 0x00000000>, /* mem ranges */ > >> + <0x03000000 0x8300 0x00000000 0x8300 0x00000000 0x80 0x00000000>, > >> + <0x03000000 0x87e0 0x00000000 0x87e0 0x00000000 0x01 0x00000000>; > >> + }; > > > > If you claim the entire 0-255 bus range, I think you should also > > specify a domain, otherwise it's not predictable which domain you > > get. > > > > The interrupt-map and interrupt-map-mask properties are required for PCI, > > otherwise you can't do LSI interrupts. > > This PCI controller supports only MSIx interrupts which are edge triggered. Interesting, so it's not PCI compliant then? I assume this will be fixed in the production version of the silicon, right? Having no support for interrupts mean that the majority of PCI device drivers will fail. > > If your hardware can support it, you should also list I/O space and prefetchable > > memory spaces. Can you explain why you have multiple non-prefetchable ranges? > > Our hardware is an ECAM based host controller and doesn't support I/O > and prefetchable memory spaces. > All on-board PCI devices connected to this PCI controller have fixed resources > and doesn't have to be allocated/reassigned. Some of these devices are > SRIOV based. I think you need to mark the ones that are nonrelocatable with flag 0x80000000, otherwise the PCI core might decide to reassign them. > Kernel's SRIOV (pci/iov.c) is expecting 'resource->parent' hierarchy > to be set, otherwise doesn't > enable SRIOV device. So, here multiple non-prefetchable ranges of root bus > aid in resource claiming and setting res->parent hierarchy. I don't understand. Isn't that just a bug in the code that you are working around with the DT. Have you tried fixing the code instead? > We do call "pci_claim_resource" in controller driver code. > "[PATCH 1/6] pci, thunder: Add support for Thunder PCIe host controller." My guess is that you are using the wrong interface here. Isn't the normal request_resource() in the host driver enough? Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
