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

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Message-ID: <20110929092643.GN2138@amd.com>
Date:	Thu, 29 Sep 2011 11:26:43 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
CC:	Joerg Roedel <joro@...tes.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] PCI: Add support for PASID capability

On Wed, Sep 28, 2011 at 03:18:15PM -0400, Valdis.Kletnieks@...edu wrote:
> 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?

Exactly. In fact, I plan to put the functionality which handles these
capabilities and the fault-handling in a seperate module where all
device drivers can use it in an easy way.

	Joerg

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