On Tue, 2009-09-01 at 06:31 -0700, Russell King - ARM Linux wrote:
> On Wed, Aug 26, 2009 at 10:22:11AM -0700, David Xiao wrote:
> > Sorry for the confusion, page_address() indeed only returns kernel
> > virtual address; and in order to support VIVT cache maintenance for the
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
> > > Linux 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
> Linux 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
> > from those, a
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
> > ad
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 15:25 -0700, Russell King - ARM Linux wrote:
> On Thu, Aug 06, 2009 at 11:46:14AM -0700, David Xiao wrote:
> > On Thu, 2009-08-06 at 06:06 -0700, Laurent Pinchart wrote:
> > > Hi Ben,
> > >
> > > On Thursday 06 August 2009 13:46:19 Ben
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
> > > applicati
