linux-kernel - PCIe PASID (Process Address Space ID) and iommu code

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Message-ID: <CA+QbAV6-C9wxPttEx0uDn_K5Y1LaGt8pxDWc8RJmN4DqR+NHtQ@mail.gmail.com>
Date:	Wed, 15 Oct 2014 16:44:34 -0700
From:	Kallol Biswas <nucleodyne@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: PCIe PASID (Process Address Space ID) and iommu code

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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