lkml.org 
[lkml]   [2010]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
On Fri, Jul 02, 2010 at 12:09:02AM -0700, Zach Pfeffer wrote:
> Hari Kanigeri wrote:
> >> He demonstrated the usage of his code in one of the emails he sent out
> >> initially. Did you go over that, and what (or how many) step would you
> >> use with the current code to do the same thing?
> >
> > -- So is this patch set adding layers and abstractions to help the User ?
> >
> > If the idea is to share some memory across multiple devices, I guess
> > you can achieve the same by calling the map function provided by iommu
> > module and sharing the mapped address to the 10's or 100's of devices
> > to access the buffers. You would only need a dedicated virtual pool
> > per IOMMU device to manage its virtual memory allocations.
>
> Yeah, you can do that. My idea is to get away from explicit addressing
> and encapsulate the "device address to physical address" link into a
> mapping.

The DMA-API already does this with the help of IOMMUs if they are
present. What is the benefit of your approach over that?

Joerg



\
 
 \ /
  Last update: 2010-07-10 16:39    [W:0.329 / U:0.540 seconds]
©2003-2014 Jasper Spaans. Advertise on this site