linux-kernel - RE: [PATCH 2/3 v13] iommu/fsl: Add additional iommu attributes required by the PAMU driver.

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Message-ID: <C5ECD7A89D1DC44195F34B25E172658D4B3708@039-SN2MPN1-011.039d.mgd.msft.net>
Date:	Tue, 23 Apr 2013 04:45:39 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Wood Scott-B07421 <B07421@...escale.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>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	Yoder Stuart-B08248 <B08248@...escale.com>
Subject: RE: [PATCH 2/3 v13] iommu/fsl: Add additional iommu attributes
 required by the PAMU driver.



> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, April 23, 2013 5:20 AM
> To: Sethi Varun-B16395
> Cc: joro@...tes.org; iommu@...ts.linux-foundation.org; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org;
> galak@...nel.crashing.org; benh@...nel.crashing.org; Yoder Stuart-B08248;
> Sethi Varun-B16395
> Subject: Re: [PATCH 2/3 v13] iommu/fsl: Add additional iommu attributes
> required by the PAMU driver.
> 
> On 04/22/2013 12:31:55 AM, Varun Sethi wrote:
> > Added the following domain attributes for the FSL PAMU driver:
> > 1. Added new iommu stash attribute, which allows setting of the
> >    LIODN specific stash id parameter through IOMMU API.
> > 2. Added an attribute for enabling/disabling DMA to a particular
> >    memory window.
> > 3. Added domain attribute to check for PAMUV1 specific constraints.
> >
> > Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
> > ---
> > v13 changes:
> > - created a new file include/linux/fsl_pamu_stash.h for stash
> > attributes.
> > v12 changes:
> > - Moved PAMU specifc stash ids and structures to PAMU header file.
> > - no change in v11.
> > - no change in v10.
> >  include/linux/fsl_pamu_stash.h |   39
> > +++++++++++++++++++++++++++++++++++++++
> >  include/linux/iommu.h          |   16 ++++++++++++++++
> >  2 files changed, 55 insertions(+), 0 deletions(-)  create mode 100644
> > include/linux/fsl_pamu_stash.h
> >
> > diff --git a/include/linux/fsl_pamu_stash.h
> > b/include/linux/fsl_pamu_stash.h new file mode 100644 index
> > 0000000..caa1b21
> > --- /dev/null
> > +++ b/include/linux/fsl_pamu_stash.h
> > @@ -0,0 +1,39 @@
> > +/*
> > + * This program is free software; you can redistribute it and/or
> > modify
> > + * it under the terms of the GNU General Public License, version 2,
> > as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program; if not, write to the Free Software
> > + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
> > 02110-1301, USA.
> > + *
> > + * Copyright (C) 2013 Freescale Semiconductor, Inc.
> > + *
> > + */
> > +
> > +#ifndef __FSL_PAMU_STASH_H
> > +#define __FSL_PAMU_STASH_H
> > +
> > +/* cache stash targets */
> > +enum pamu_stash_target {
> > +	PAMU_ATTR_CACHE_L1 = 1,
> > +	PAMU_ATTR_CACHE_L2,
> > +	PAMU_ATTR_CACHE_L3,
> > +};
> > +
> > +/*
> > + * This attribute allows configuring stashig specific parameters
> > + * in the PAMU hardware.
> > + */
> > +
> > +struct pamu_stash_attribute {
> > +	u32 	cpu;	/* cpu number */
> > +	u32 	cache;	/* cache to stash to: L1,L2,L3 */
> > +};
> > +
> > +#endif  /* __FSL_PAMU_STASH_H */
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h index
> > 2727810..c5dc2b9 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -57,10 +57,26 @@ struct iommu_domain {
> >  #define IOMMU_CAP_CACHE_COHERENCY	0x1
> >  #define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device
> > intrs */
> >
> > +/*
> > + * Following constraints are specifc to PAMUV1:
> 
> FSL_PAMUV1
> 
> > + *  -aperture must be power of 2, and naturally aligned
> > + *  -number of windows must be power of 2, and address space size
> > + *   of each window is determined by aperture size / # of windows
> > + *  -the actual size of the mapped region of a window must be power
> > + *   of 2 starting with 4KB and physical address must be naturally
> > + *   aligned.
> > + * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned
> > contraints.
> > + * The caller can invoke iommu_domain_get_attr to check if the
> > underlying
> > + * iommu implementation supports these constraints.
> > + */
> > +
> >  enum iommu_attr {
> >  	DOMAIN_ATTR_GEOMETRY,
> >  	DOMAIN_ATTR_PAGING,
> >  	DOMAIN_ATTR_WINDOWS,
> > +	DOMAIN_ATTR_PAMU_STASH,
> > +	DOMAIN_ATTR_PAMU_ENABLE,
> > +	DOMAIN_ATTR_FSL_PAMUV1,
> >  	DOMAIN_ATTR_MAX,
> 
> Please be consistent on whether "PAMU" gets an "FSL_" namespace prefix
> (I'd prefer that it does).
Submitted new version(v14) of the patch with updated attribute names.

-Varun

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