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

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Message-ID: <1282926826.5075.21.camel@m0nster>
Date:	Fri, 27 Aug 2010 09:33:46 -0700
From:	Daniel Walker <dwalker@...eaurora.org>
To:	Catalin Marinas <catalin.marinas@....com>
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>
Subject: Re: [PATCH 03/24] arm: mm: add proc info for ScorpionMP

On Fri, 2010-08-27 at 17:04 +0100, Catalin Marinas wrote:
> On Fri, 2010-08-27 at 16:29 +0100, Daniel Walker wrote:
> > On Fri, 2010-08-27 at 14:54 +0100, Catalin Marinas wrote:
> > > On Wed, 2010-08-25 at 05:57 +0100, Jeff Ohlstein wrote:
> > > > From: Daniel Walker <dwalker@...eaurora.org>
> > > >
> > > > ScorpionMP does not have the SMP/nAMP and TLB ops broadcasting bits in
> > > > ACTLR.
> > > >
> > > > Signed-off-by: Daniel Walker <dwalker@...eaurora.org>
> > > > Signed-off-by: Jeff Ohlstein <johlstei@...eaurora.org>
> > > > ---
> > > >  arch/arm/mm/proc-v7.S |   24 ++++++++++++++++++++++++
> > > >  1 files changed, 24 insertions(+), 0 deletions(-)
> > > >
> > > > diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
> > > > index 7aaf88a..98fd7e5 100644
> > > > --- a/arch/arm/mm/proc-v7.S
> > > > +++ b/arch/arm/mm/proc-v7.S
> > > > @@ -196,6 +196,7 @@ __v7_setup:
> > > >         orreq   r0, r0, #(1 << 6) | (1 << 0)    @ Enable SMP/nAMP mode and
> > > >         mcreq   p15, 0, r0, c1, c0, 1           @ TLB ops broadcasting
> > > >  #endif
> > > > +__v7_msm_setup:
> > > >         adr     r12, __v7_setup_stack           @ the local stack
> > > >         stmia   r12, {r0-r5, r7, r9, r11, lr}
> > > >         bl      v7_flush_dcache_all
> > >
> > > It may be better to move the generic __v7_setup here and have a specific
> > > entry for ARM Ltd cores (mask 0xff0f0000 and value 0x410f0000).
> > 
> > I'm not sure I follow you.. Are you saying there are other cpu's that
> > don't need the SMP stuff at the top of __v7_setup ?
> 
> The SMP/nAMP bit is something specific to the ARM11MPCore and Cortex-A9
> processors produced by ARM. If you core doesn't need this, it should use
> a default __v7_setup without any additional bits being set.
> 
> I'm not aware of other MP ARM processors produced by other companies
> that would require exactly the same bit being set.

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?

There's 4 or 5 other cpu's that have SMP but none have had to jump over
those bits AFAIK ..

Daniel

-- 
Sent by an consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
Forum.


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