From: Gerd Knorr <kraxel@bytesex.org>
To: linux-kernel@vger.kernel.org
Subject: Re: DMA to/from user buffers
Date: 4 Sep 2001 19:30:49 GMT [thread overview]
Message-ID: <slrn9paav9.8bf.kraxel@bytesex.org> (raw)
In-Reply-To: <20010904164509.A27144@csr-pc1.zib.de>
Sebastian Heidl wrote:
>
> Hi,
>
> two questions about using an user-supplied buffer (e.g. malloced
> in user space) for DMA transfers:
>
> 1. Is it possible ?
> 2. What restrictions/requirements apply for the buffer (alignment...) ?
>
> Documentation/DMA-mapping.txt only talks about buffers allocated in
> kernel space.
Lock down the user pages using kiobufs (see include/linux/iobufs.h),
then feed these pages to the pci_* functions.
Gerd
--
Damn lot people confuse usability and eye-candy.
next prev parent reply other threads:[~2001-09-04 20:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-04 14:45 DMA to/from user buffers Sebastian Heidl
2001-09-04 19:30 ` Gerd Knorr [this message]
2001-09-05 7:51 ` Helge Hafting
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