lkml.org 
[lkml]   [2001]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: alpha iommu fixes
On Mon, May 21, 2001 at 02:54:16AM +1000, Andrew Morton wrote:
> No. Most of the pci_map_single() implementations just
> use virt_to_bus()/virt_to_phys(). [..]

then you are saying that on the platforms without an iommu the pci_map_*
cannot fail, of course, furthmore even a missing pci_unmap cannot
trigger an iommu address space leak on those platforms. That has nothing
to do with the fact pci_map_single can fail or not, the device drivers
are not architectural specific.

> [..] Even sparc64's fancy
> iommu-based pci_map_single() always succeeds.

Whatever sparc64 does to hide the driver bugs you can break it if you
pci_map 4G+1 bytes of phyical memory. Otherwise it means it's sleeping
or looping inside the pci_map functions which would break things in
another manner.

Andrea
-
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 12:53    [W:0.300 / U:0.636 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site