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

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Message-ID: <CA+QbAV44doidDEw20eojiZsmCHfeiR4eioy_+X5B6E8nQHh6_A@mail.gmail.com>
Date:	Wed, 15 Oct 2014 16:32:57 -0700
From:	Kallol Biswas <nucleodyne@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: PCIe PASID (Process Address Space ID) and iommu code

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 with 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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