linux-kernel - RE: [PATCH 8/9] dspbridge: add map support for big buffers

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Date:	Thu, 26 Aug 2010 07:38:26 -0500
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"hiroshi.doyu@...ia.com" <hiroshi.doyu@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>
Subject: RE: [PATCH 8/9] dspbridge: add map support for big buffers


Hi Fujita,
________________________________________
>From: FUJITA Tomonori [fujita.tomonori@....ntt.co.jp]
>Sent: Thursday, August 26, 2010 1:55 AM
>To: Guzman Lugo, Fernando
>Cc: linux-omap@...r.kernel.org; linux-kernel@...r.kernel.org; ohad@...ery.com; hiroshi.doyu@...ia.com; ameya.palande@...ia.com; felipe.contreras@...ia.com
>Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers
>
>On Wed, 30 Jun 2010 19:20:59 -0500
>Fernando Guzman Lugo <x0095840@...com> wrote:
>
>> due to a restriction in scatter gather lists, it can
>> not be created a list for a buffer bigger than 1MB.
>> This patch is spliting big mappings into 1MB mappings.
>
>I don't read the whole thread but the above description is incorrect.
>
>Why can't you use scatter gather chaining? You can create a scatter
>list for a buffer larger than 1MB.

The thing is that ARM architecture does not support SG chaining. This patch should be
seen like a workaround until it is fixed in iovmm module.

Thanks and regards,
Fernando.
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