Re: PCIe PASID (Process Address Space ID) and iommu code

[Bjorn Helgaas]

[+cc Joerg, Suravee, Jay, iommu list, linux-pci]

On Wed, Oct 15, 2014 at 5:44 PM, Kallol Biswas <nucleodyne@xxxxxxxxx> wrote:
> Resending, as message got bounced for html content.
> --------------------------------------------
> Hi,
>     PCIe has introduced PASID TLP Prefix.  There are two ECNs on this.
>
> It seems that AMD iommu code makes use of PASID. Is there a device that
> utilizes this TLP prefix?
>
> PASID allocation and management within a device is not clear to me. How
> does device know which PASID to issue for which virtual address? Who makes
> the association? Must be software/OS, but how? There is no table for this
> like MSI-X table.
>
> Any pointer/documentation will be appreciated.
>
> Regards,
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