linux-kernel - Re: Reading /dev/mem by dd

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Message-ID: <bec9a5871002160103t17c36599w13f18d79cc84e539@mail.gmail.com>
Date:	Tue, 16 Feb 2010 11:03:49 +0200
From:	Nameer Yarkon <nameer.yarkon@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Robert Hancock <hancockrwd@...il.com>,
	"Anton D. Kachalov" <mouse@...c.ru>, linux-kernel@...r.kernel.org
Subject: Re: Reading /dev/mem by dd

On Tue, Feb 16, 2010 at 10:41 AM, Andi Kleen <andi@...stfloor.org> wrote:
> Modern X does it through kernel modules (DRM, GEM etc.)

is it done by an mmap call (to the device) ?

> One reason it's needed to do it this way is IOMMUs.

why would it care about IOMMUs ? do graphic cards manipulate the memory too ?

thank you!

>
> -Andi
>
> --
> ak@...ux.intel.com -- Speaking for myself only.
>
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