linux-kernel - Re: [PATCHv4 4/4] iommu: create new api to set valid da range

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Message-ID: <AANLkTikawFKKLkT_CRw4HbeTsiSoJyd70k2e3a0F5Fr7@mail.gmail.com>
Date:	Wed, 20 Oct 2010 19:26:37 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
Cc:	"Hiroshi.DOYU@...ia.com" <Hiroshi.DOYU@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>,
	"david.cohen@...ia.com" <david.cohen@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCHv4 4/4] iommu: create new api to set valid da range

On Wed, Oct 20, 2010 at 6:22 PM, Guzman Lugo, Fernando
<fernando.lugo@...com> wrote:
>> On Wed, Oct 20, 2010 at 5:48 AM, Fernando Guzman Lugo
>> <x0095840@...com> wrote:
>> > Some IOMMUs cannot use the whole 0x0 - 0xFFFFFFFF range.
>> > With this new API the valid range can be set.
>> >
>> > Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
>>
>> I don't see the point in having an API. It could be done
>
> Thanks to this api we can make this:
>
> A new kconfig parameter for DMM size is added. Also DMM is
> allocated in the last part of the IVA MMU capable address.
> So that DMM address are far away of shared memory address
> reducing the probability of shared memory corruption.

Ok, that's why it's usually a good idea to send a patch that makes use
of the new API.

-- 
Felipe Contreras
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