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

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Date:	Mon, 01 Jul 2013 08:35:26 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Varun Sethi <Varun.Sethi@...escale.com>
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,
	stuart.yoder@...escale.com, scottwood@...escale.com,
	Timur Tabi <timur@...i.org>
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>

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