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

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Date:	Tue, 9 Dec 2014 11:19:40 +0100
From:	Arend van Spriel <arend@...adcom.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	brcm80211-dev-list <brcm80211-dev-list@...adcom.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	"Hante Meuleman" <meuleman@...adcom.com>,
	"hauke@...ke-m.de" <hauke@...ke-m.de>,
	David Miller <davem@...emloft.net>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: using DMA-API on ARM

On 12/08/14 18:01, Arend van Spriel wrote:
> On 12/08/14 17:03, Catalin Marinas wrote:
>> On Mon, Dec 08, 2014 at 03:01:32PM +0000, Arnd Bergmann wrote:
>>> [ 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
>>
>> If the above value is correct, they should make sure bit 22 is set in
>> AUX_CTRL.
>
> Hante applied the patch and it now says:
>
> [ 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 0x4e530001
>
> He started running a test overnight. So will see if it hits the failure
> with this L2 cache configuration.

The issue did not trigger overnight so it seems setting bit 22 <Shared 
Attribute _Override_ Enable> solves the issue over here. Now the 
question is how to move forward with this. As I understood from Catalin 
this patch was not included as it was not considered responsibility of 
the linux kernel.

Regards,
Arend
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