From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
linaro-mm-sig@lists.linaro.org,
LKML <linux-kernel@vger.kernel.org>,
DRI Development <dri-devel@lists.freedesktop.org>,
linux-media@vger.kernel.org, Rob Clark <rob.clark@linaro.org>,
Rebecca Schultz Zavin <rebecca@android.com>
Subject: Re: [PATCH] dma-buf: mmap support
Date: Wed, 18 Apr 2012 20:10:11 +0100 [thread overview]
Message-ID: <20120418201011.46d44f4b@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <201204181406.14159.arnd@arndb.de>
> 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.
next prev parent reply other threads:[~2012-04-18 19:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-18 13:52 Daniel Vetter
2012-04-18 14:06 ` Arnd Bergmann
2012-04-18 14:20 ` Rob Clark
2012-04-18 14:24 ` Daniel Vetter
2012-04-18 19:10 ` Alan Cox [this message]
2012-04-23 23:00 ` Rebecca Schultz Zavin
2012-04-24 9:08 Daniel Vetter
2012-04-24 16:37 ` InKi Dae
2012-04-24 17:02 ` Daniel Vetter
2012-04-25 2:31 ` InKi Dae
2012-05-11 15:30 ` Rob Clark
2012-05-18 4:12 ` Sumit Semwal
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