On Tue, 2009-08-25 at 16:17 -0700, Laurent Pinchart wrote:
On Wednesday 26 August 2009 00:02:48 David Xiao wrote:
On Tue, 2009-08-25 at 05:53 -0700, Steven Walter wrote:
On Thu, Aug 6, 2009 at 6:25 PM, Russell King - ARM
Linuxli...@arm.linux.org.uk wrote:
[...]
As far
On Tue, 2009-08-25 at 05:53 -0700, Steven Walter wrote:
On Thu, Aug 6, 2009 at 6:25 PM, Russell King - ARM
Linuxli...@arm.linux.org.uk wrote:
[...]
As far as userspace DMA coherency, the only way you could do it with
current kernel APIs is by using get_user_pages(), creating a scatterlist
On Tue, 2009-08-11 at 02:31 -0700, Catalin Marinas wrote:
On Thu, 2009-08-06 at 22:59 -0700, David Xiao wrote:
The V7 speculative prefetching will then probably apply to DMA coherency
issue in general, both kernel and user space DMAs. Could this be
addressed by inside the dma_unmap_sg
On Fri, 2009-08-07 at 13:28 -0700, Russell King - ARM Linux wrote:
The kernel direct mapping maps all system (low) memory with normal
memory cacheable attributes.
So using vmalloc, dma_alloc_coherent, using pages in userspace all
create duplicate mappings of pages.
If we do want to
On Thu, 2009-08-06 at 06:06 -0700, Laurent Pinchart wrote:
Hi Ben,
On Thursday 06 August 2009 13:46:19 Ben Dooks wrote:
On Thu, Aug 06, 2009 at 12:08:21PM +0200, Laurent Pinchart wrote:
[snip]
The second problem is to ensure cache coherency. As the userspace
application will read
