linux-kernel - RE: [PATCH 3/3 v18] iommu/fsl: Freescale PAMU driver and iommu implementation.

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Date:	Mon, 1 Jul 2013 14:36:35 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	"joro@...tes.org" <joro@...tes.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	Yoder Stuart-B08248 <B08248@...escale.com>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Timur Tabi <timur@...i.org>
Subject: RE: [PATCH 3/3 v18] iommu/fsl: Freescale PAMU driver and iommu
 implementation.

Thanks Alex.

> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@...hat.com]
> Sent: Monday, July 01, 2013 8:05 PM
> To: Sethi Varun-B16395
> Cc: joro@...tes.org; iommu@...ts.linux-foundation.org; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org;
> benh@...nel.crashing.org; galak@...nel.crashing.org; Yoder Stuart-B08248;
> Wood Scott-B07421; Timur Tabi
> Subject: Re: [PATCH 3/3 v18] iommu/fsl: Freescale PAMU driver and iommu
> implementation.
> 
> On Mon, 2013-07-01 at 15:41 +0530, Varun Sethi wrote:
> > Following is a brief description of the PAMU hardware:
> > PAMU determines what action to take and whether to authorize the
> > action on the basis of the memory address, a Logical IO Device Number
> > (LIODN), and PAACT table (logically) indexed by LIODN and address.
> > Hardware devices which need to access memory must provide an LIODN in
> addition to the memory address.
> >
> > Peripheral Access Authorization and Control Tables (PAACTs) are the
> > primary data structures used by PAMU. A PAACT is a table of peripheral
> > access authorization and control entries (PAACE).Each PAACE defines
> > the range of I/O bus address space that is accessible by the LIOD and
> > the associated access capabilities.
> >
> > There are two types of PAACTs: primary PAACT (PPAACT) and secondary
> > PAACT (SPAACT).A given physical I/O device may be able to act as one
> > or more independent logical I/O devices (LIODs). Each such logical I/O
> > device is assigned an identifier called logical I/O device number
> > (LIODN). A LIODN is allocated a contiguous portion of the I/O bus
> > address space called the DSA window for performing DSA operations. The
> > DSA window may optionally be divided into multiple sub-windows, each
> > of which may be used to map to a region in system storage space. The
> > first sub-window is referred to as the primary sub-window and the
> remaining are called secondary sub-windows.
> >
> > This patch provides the PAMU driver (fsl_pamu.c) and the corresponding
> > IOMMU API implementation (fsl_pamu_domain.c). The PAMU hardware driver
> > (fsl_pamu.c) has been derived from the work done by Ashish Kalra and
> Timur Tabi.
> >
> > Signed-off-by: Timur Tabi <timur@...i.org>
> > Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> > ---
> 
> For iommu group support
> 
> Acked-by: Alex Williamson <alex.williamson@...hat.com>
>