linux-kernel - Re: [PATCH] dma-buf: mmap support

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Message-ID: <20120418201011.46d44f4b@pyramind.ukuu.org.uk>
Date:	Wed, 18 Apr 2012 20:10:11 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	linaro-mm-sig@...ts.linaro.org,
	LKML <linux-kernel@...r.kernel.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	linux-media@...r.kernel.org, Rob Clark <rob.clark@...aro.org>,
	Rebecca Schultz Zavin <rebecca@...roid.com>
Subject: Re: [PATCH] dma-buf: mmap support

> How do you ensure that no device can do DMA on the buffer while it's mapped
> into user space in a noncoherent manner?

Why do we want to enforce that ? We provide the appropriate base service
but you need to know what you are doing. In reality a lot of use cases
are going to need far more than a simple kernel API could try and guess
coherency rules about.

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