lkml.org 
[lkml]   [2006]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [openib-general] Re: [PATCH 21 of 53] ipath - use phys_to_virt instead of bus_to_virt
On Mon, May 15, 2006 at 02:28:45PM -0700, Roland Dreier wrote:
> Bryan> Any ideas? Should this turn from a one-liner into a
> Bryan> big-refactor-for-2.6.18 patch?
>
> I don't think there's a quick way to fix this. What you really want
> to do is override the DMA mapping functions for your device so that
> you can keep track of the kernel mapping.

Or figure out which openib.org interface has to change so the
original virt addresses that were registered/handed to the ULP
are passed down to the low level interface driver too.
Seems like a more obvious way to fix the problem.
Someone did suggest this already, right?

> (cf the ehca driver), and I think patches to do it on x86-64 are
> floating around as part of the "Calgary IOMMU" work.

parisc has been using dma_ops for several years.
I don't expect dma_ops to become part of generic code.
DMA support is inherently arch specific.
Because of that, I don't look forward to a low level
device driver that is mucking with dma_ops.

hth,
grant
-
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: 2006-05-16 01:15    [W:0.136 / U:0.796 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site