PCIe PASID (Process Address Space ID) and iommu code

[Kallol Biswas]

Resending, as message got bounced for html content.
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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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