linux-kernel - Re: [PATCH] ARM: cache-uniphier: activate ways for secondary CPUs

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Message-ID: <51817650.ZWFPAKxQiK@wuerfel>
Date:	Tue, 26 Apr 2016 00:13:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: cache-uniphier: activate ways for secondary CPUs

On Friday 15 April 2016 16:05:46 Masahiro Yamada wrote:
> This outer cache allows to control active ways independently for
> each CPU, but currently nothing is done for secondary CPUs.  In
> other words, all the ways are locked for secondary CPUs by default.
> This commit fixes it to fully bring out the performance of this
> outer cache.
> 
> There would be two possible ways to achieve this:
> 
> [1] Each CPU initializes active ways for itself.  This can be done
>     via the SSCLPDAWCR register.  This is a banked register, so each
>     CPU sees a different instance of the register.
> 
> [2] The master CPU initializes active ways for all the CPUs.  This
>     is available via SSCDAWCARMR(N) registers.  They are mapped at
>     the address SSCDAWCARMR + 4 * N, where N is the CPU number.
> 
> Currently, the outer cache frame work does not support a per-CPU
> init callback.  So this commit adopts [2]; the master CPU iterates
> over possible CPUs setting up SSCDAWCARMR(N) registers.
> 
> Unfortunately, the register offsets of SSCDAWCARMR(N) are different
> by SoC.  We can live with it by checking the version register.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> 

Applied to next/soc, thanks!

I'm a little lost with the patches you send, could you check that
I have applied all the ones you sent for 4.7 so far?

	Arnd