netdev - RE: [RFC,1/8] soc/fman: Add FMan MURAM support

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Message-ID: <DM2PR03MB3835BC56CD47613CB1AD4EBE6E00@DM2PR03MB383.namprd03.prod.outlook.com>
Date:	Mon, 20 Apr 2015 08:58:20 +0000
From:	"Igal.Liberman@...escale.com" <Igal.Liberman@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Scott Wood <scottwood@...escale.com>,
	Madalin-Cristian Bucur <madalin.bucur@...escale.com>
Subject: RE: [RFC,1/8] soc/fman: Add FMan MURAM support



Regards,
Igal Liberman.

> -----Original Message-----
> From: Kumar Gala [mailto:galak@...nel.crashing.org]
> Sent: Thursday, March 12, 2015 5:57 PM
> To: Liberman Igal-B31950
> Cc: linuxppc-dev@...ts.ozlabs.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Wood Scott-B07421
> Subject: Re: [RFC,1/8] soc/fman: Add FMan MURAM support
> 
> 
> On Mar 11, 2015, at 12:07 AM, Igal.Liberman <igal.liberman@...escale.com>
> wrote:
> 
> > From: Igal Liberman <Igal.Liberman@...escale.com>
> >
> > Add Frame Manager Multi-User RAM support.
> >
> > Signed-off-by: Igal Liberman <Igal.Liberman@...escale.com>
> > ---
> > drivers/soc/fsl/fman/Kconfig            |    1 +
> > drivers/soc/fsl/fman/Makefile           |    5 +-
> > drivers/soc/fsl/fman/fm_muram.c         |  174
> +++++++++++++++++++++++++++++++
> > drivers/soc/fsl/fman/inc/fm_muram_ext.h |   98 +++++++++++++++++
> > 4 files changed, 276 insertions(+), 2 deletions(-) create mode 100644
> > drivers/soc/fsl/fman/fm_muram.c create mode 100644
> > drivers/soc/fsl/fman/inc/fm_muram_ext.h
> >
> 
> use lib/genalloc instead of rheap
> 

Hi Kumar,
I looked into lib/genalloc allocator.
As far as I see, the genalloc allocator doesn't allow to control the memory alignment when you allocate a chunk of memory.
Two important notes regarding MURAM memory:
- The allocated memory chunks should have specific alignment (might be different in each chunk).
- The allocations must be efficient, we don't want to "waste" MURAM due to alignment issues.

> - k
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