linux-kernel - Re: using DMA-API on ARM

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Message-ID: <20141208151733.GF11285@n2100.arm.linux.org.uk>
Date:	Mon, 8 Dec 2014 15:17:33 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Hante Meuleman <meuleman@...adcom.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	brcm80211-dev-list <brcm80211-dev-list@...adcom.com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arend Van Spriel <arend@...adcom.com>,
	David Miller <davem@...emloft.net>,
	Marek Szyprowski <m.szyprowski@...sung.com>, hauke@...ke-m.de
Subject: Re: using DMA-API on ARM

On Mon, Dec 08, 2014 at 04:01:32PM +0100, Arnd Bergmann wrote:
> In your log, I see this message:
> 
> [    0.000000] PL310 OF: cache setting yield illegal associativity
> [    0.000000] PL310 OF: -1069781724 calculated, only 8 and 16 legal
> [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
> [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
> [    0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled
> [    0.000000] L2C-310 cache controller enabled, 16 ways, 256 kB
> [    0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x4e130001
> 
> Evidently the cache controller information in DT is incorrect and
> the setup may be wrong as a consequence, which may explain cache
> coherency problems.

No.  See d0b92845e54 (ARM: 8182/1: l2c: Make l2x0_cache_size_of_parse() return 'int')
which was merged in rc3, post-dating this kernel.  The original commit
was buggy, and produces those harmless "illegal associativity" messages.
They occur if DT *doesn't* specify the cache parameters, in which case
we use the hardware-set value (which /should/ be correct.)

We made these optional in DT as hardware really should set these
correctly in the first place.

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