linux-kernel - Re: [PATCH 3/3 v2] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

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Message-Id: <91BA7E6D-4B29-4CCF-80EB-947EBBCF51F4@kernel.crashing.org>
Date:	Thu, 4 Oct 2012 08:20:25 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	"<b16395@...escale.com>" <b16395@...escale.com>
Cc:	<joerg.roedel@....com>, <iommu@...ts.linux-foundation.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	Varun Sethi <Varun.Sethi@...escale.com>
Subject: Re: [PATCH 3/3 v2] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.


On Oct 4, 2012, at 6:56 AM, <b16395@...escale.com> <b16395@...escale.com> wrote:

> From: Varun Sethi <Varun.Sethi@...escale.com>
> 
> 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 LIOD 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 (timur@...escale.com).
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> ---

I'm not seeing any of the comments I made addressed.

What changed in this version?

- k--
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