Re: [PATCH for-4.6 0/5] xen: arm: Parse PCI DT nodes' ranges and interrupt-map

[Julien Grall <julien.grall@linaro.org>]

(CC Jan and Andrew)

Hi Suravee,

On 17/02/15 03:04, Suravee Suthikulanit wrote:
> By the way, looking at the output of "xl dmesg", I saw the following
> message:
> 
> (XEN) DOM0: PCI host bridge /smb/pcie@f0000000 ranges:
> (XEN) DOM0:    IO 0xefff0000..0xefffffff -> 0x00000000
> (XEN) DOM0:   MEM 0x40000000..0xbfffffff -> 0x40000000
> (XEN) DOM0:   MEM 0x100000000..0x7fffffffff -> 0x100000000
> (XEN) DOM0: pci-host-generic f0000000.pcie: PCI host bridge to bus 0000:00
> (XEN) DOM0: pci_bus 0000:00: root bus resource [bus 00-7f]
> (XEN) DOM0: pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
> (XEN) DOM0: pci_bus 0000:00: root bus resource [mem 0x40000000-0xbfffffff]
> (XEN) DOM0: pci_bus 0000:00: root bus resource [mem
> 0x100000000-0x7fffffffff]
> (XEN) DOM0: pci 0000:00:00.0: of_irq_parse_pci() failed with rc=-19
> (XEN) do_physdev_op 16 cmd=25: not implemented yet
> (XEN) do_physdev_op 16 cmd=15: not implemented yet
> (XEN) DOM0: pci 0000:00:00.0: Failed to add - passthrough or MSI/MSI-X
> might fail!
> (XEN) DOM0: pci 0000:00:02.0: of_irq_parse_pci() failed with rc=-19
> (XEN) do_physdev_op 16 cmd=15: not implemented yet
> (XEN) DOM0: pci 0000:00:02.0: Failed to add - passthrough or MSI/MSI-X
> might fail!
> (XEN) do_physdev_op 16 cmd=15: not implemented yet
> (XEN) DOM0: pci 0000:00:02.1: Failed to add - passthrough or MSI/MSI-X
> might fail!
> (XEN) do_physdev_op 16 cmd=15: not implemented yet
> (XEN) DOM0: pci 0000:01:00.0: Failed to add - passthrough or MSI/MSI-X
> might fail!
> (XEN) DOM0: pci 0000:01:00.1: of_irq_parse_pci() failed with rc=-22
> (XEN) do_physdev_op 16 cmd=15: not implemented yet
> (XEN) DOM0: pci 0000:01:00.1: Failed to add - passthrough or MSI/MSI-X
> might fail!
> 
> IIUC, This is because xen_add_device() failed, and it seems to be
> related to some hyper call not implemented. Not sure what is "cmd=15".
> Any ideas?

There is 2 commands not implemented in the log:
	* cmd 15: PHYSDEVOP_manage_pci_add
	* cmd 25: PHYSDEVOP_pci_device_add

Linux fallbacks on the former because the later is not implemented.

AFAICT, PHYSDEVOP_manage_pci_add should not be implemented for ARM
because it doesn't support segment. I suspect that it's kept for legacy
on older Xen x86. Maybe Jan or Andrew have more input on this?

Cheers,

-- 
Julien Grall