Re: [Xen-devel] [RFC PATCH v3 10/18] xen/arm: ITS: Add APIs to add and assign device

[Vijay Kilari <vijay.kilari@xxxxxxxxx>]

On Mon, Jun 29, 2015 at 5:59 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> CIOn Mon, 2015-06-22 at 17:31 +0530, vijay.kilari@xxxxxxxxx wrote:
>> +/* Device assignment. Should be called from pci_device_add */
>> +int its_add_device(struct domain *d, u32 devid)
>> +{
>
> Prior to the PCI series landing, and to enable dom0 to use ITS it might
> be possible to call this from xen/arch/arm/platforms/thunderx.c via the
> specific_mappings platform hook, which would also expose the PCI
> controller to dom0 via a series of specific mmio mappings (look at
> xen/arch/arm/platforms/xgene-storm.c for the sort of thing I mean).
>
> That would, I think, give basic PCI functionality for dom0 (i.e.
> allowing us to boot on thunderx) and decouple things from the PCI series
> somewhat, which ought to make things easier overall IMHO.

  In case ThunderX, mmio mappings PCI RC is parsed to find devices.
How do we know device ids upfront to call its_add_device?

>
> Ian.
>

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