From: Andre Schwarz <andre.schwarz@matrix-vision.de>
To: "Ira W. Snyder" <iws@ovro.caltech.edu>
Cc: LinuxPPC List <linuxppc-dev@ozlabs.org>
Subject: PCI DMA to user mem on mpc83xx
Date: Mon, 23 May 2011 11:12:41 +0200 [thread overview]
Message-ID: <4DDA2509.6070702@matrix-vision.de> (raw)
Ira,
we have a pretty old PCI device driver here that needs some basic rework
running on 2.6.27 on several MPC83xx.
It's a simple char-device with "give me some data" implemented using
read() resulting in zero-copy DMA to user mem.
There's get_user_pages() working under the hood along with
SetPageDirty() and page_cache_release().
Main goal is to prepare a sg-list that gets fed into a DMA controller.
I wonder if there's a more up-to-date/efficient and future proof scheme
of creating the mapping.
Could you provide some pointers or would you stick to the current scheme ?
Regards,
André
MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner
next reply other threads:[~2011-05-23 9:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-23 9:12 Andre Schwarz [this message]
2011-05-23 17:27 ` PCI DMA to user mem on mpc83xx Ira W. Snyder
2011-05-24 9:47 ` Andre Schwarz
2011-05-24 8:15 ` David Laight
2011-05-24 10:02 ` Andre Schwarz
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