[lkml]   [2005]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups
Alan Cox writes:

> On Iau, 2005-03-17 at 09:34, Paul Mackerras wrote:
> > This code needs real physical addresses, which are not the same things
> > as bus addresses.
> Not always. The code needs platform specific goodies. We've only never
> been burned so far because there isn't a box with an IOMMU and AGPGART
> where one maps through the other.

That sounds like a good way to make AGP accesses slower. :)

Seriously, given that AGP is a technology that is being superseded by
PCI Express, I think it's reasonable to look at the range of current
implementations to see what we have to cope with. So I don't think
it's worth worrying too much about the possibility of GARTs that go
through the IOMMU. However, the idea of having phys_to_agp/agp_to_phys
(or virt_to_agp/agp_to_virt) sounds like it wouldn't be too much
effort, if it would help Xen.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:11    [W:0.083 / U:6.216 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site