linux-kernel - Re: [PATCH 03/24] arm: mm: add proc info for ScorpionMP

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Date:	Tue, 31 Aug 2010 13:18:36 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Daniel Walker <dwalker@...eaurora.org>
Cc:	Jeff Ohlstein <johlstei@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Tony Lindgren <tony@...mide.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>
Subject: Re: [PATCH 03/24] arm: mm: add proc info for ScorpionMP

On Fri, 2010-08-27 at 20:53 +0100, Daniel Walker wrote:
> On Fri, 2010-08-27 at 17:49 +0100, Catalin Marinas wrote:
> 
> > > So your saying it makes more sense to change the msm entry into the
> > > default entry, and make the current default into the
> > > ARM11MPCore/Cortex-A9 entry?
> >
> > So my opinion is to not add any specific msm code but make the
> > __v7_setup skip the ACTLR bit setting. Then add an entry for Cortex-A9
> > to set those bits.
> >
> 
> how about this? Naming is of course flexible ..

I cc'ed Santosh as well. I'm not sure whether TI are using a Cortex-A9
but with different manufacturer field (I suspect it's still 0x41).

> ScorpionMP does not have the SMP/nAMP and TLB ops broadcasting bits in
> ACTLR. These bits are only used on ARM11MPCore and Cortex-A9 from arm.
> This patch just makes it so no other arm core ends up getting these
> bits set.
> 
> Signed-off-by: Daniel Walker <dwalker@...eaurora.org>
> 
> ---
>  arch/arm/mm/proc-v7.S |   26 +++++++++++++++++++++++++-
>  1 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
> index 7aaf88a..e1b5492 100644
> --- a/arch/arm/mm/proc-v7.S
> +++ b/arch/arm/mm/proc-v7.S
> @@ -189,13 +189,14 @@ cpu_v7_name:
>   *     It is assumed that:
>   *     - cache type register is implemented
>   */
> -__v7_setup:
> +__v7_armmp_setup:

Maybe __v7_ca9mp_setup. Future MP processors from ARM may not need this
bit set.

> +__v7_armmp_proc_info:
> +       .long   0x410f0000              @ Required ID value
> +       .long   0xff0f0000              @ Mask for ID

We could restrict it to:

	.long	0x410fc090
	.long	0xff0ffff0

Otherwise the patch looks fine. Thanks.

-- 
Catalin

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