From: William Waddington <waddington@tahomatech.com>
To: linux-kernel@vger.kernel.org
Subject: kiobufs and highmem
Date: Wed, 17 Jul 2002 11:15:22 -0700 [thread overview]
Message-ID: <3D35B43A.4050804@tahomatech.com> (raw)
Hello All,
I have a 2.4.x char driver which works fine, except in boxes with lots of
memory.
user_buffer -> write() -> map_user_kiobuf() -> pci_map_sg() -> Pci DMA
I'm using the .page/.offset version of the scatterlist, but in the HIGHMEM case,
map_user_kiobuf() seems to return peculiar page addresses.
What is the state of kiobufs/HIGHMEM in 2.4.x? Do I need to implement
a bounce buffer in the driver? Some email correspondence indicates so,
but I would be grateful for a definitive word from the kernel folks.
TIA,
Bill Waddington
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reply other threads:[~2002-07-17 18:13 UTC|newest]
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