lkml.org 
[lkml]   [2002]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Calculating kernel logical address ..
Jesse Barnes wrote:
>
> On Mon, Sep 09, 2002 at 02:00:35PM -0400, Richard B. Johnson wrote:
> > Well I just read Documentation/DMA-mapping.txt as advised by David
> > and it seems as though it will no longer be possible to do what
> > many programmers have been wanting to do, to wit:
> >
> > (1) In user-code, allocate a buffer.
> > (2) Lock that buffer into memory.
> > (3) Call some driver that DMAs data to/from that buffer.
>
> It looks drivers/media/video/video-buf.c uses alloc_kiovec() and
> map_user_kiobuf() to do it.

For video-buf.c and for Imran's application, that's just a wrapper
which is used to get at get_user_pages().

It would be best to not use the kiobuf code please - its future is
up in the air. Just use get_user_pages() directly for now.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:28    [from the cache]
©2003-2011 Jasper Spaans