linux-kernel - Re: [PATCH 4/4] PCI: Add support for PASID capability

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Message-ID: <15060.1317237495@turing-police.cc.vt.edu>
Date:	Wed, 28 Sep 2011 15:18:15 -0400
From:	Valdis.Kletnieks@...edu
To:	Joerg Roedel <joro@...tes.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] PCI: Add support for PASID capability

On Tue, 27 Sep 2011 00:15:39 +0200, Joerg Roedel said:

> PASID stands for Process Address Space ID, it basically allows a PCI
> device to access multiple IO address spaces at the same time using an
> IOMMU. Users should enable it when they want to compile an IOMMU driver
> into the kernel that supports PASIDs for the translated devices.
> I'll add all that information to the Kconfig help. Thanks a lot for your
> feedback :)

Is this a case where the PCI device drivers in question should be doing a
'select' or 'depends on' if they support talking to an IOMMU using PASID?

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