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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-07-02 at 14:10 +0530, Vijay Kilari wrote:
> 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?

Ah yes, this approach probably doesn't work for ITS. Which is a shame.

Ian.


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