On Feb 20, 2012 4:31 PM, "Catalin Marinas" wrote:
>
> On 16 February 2012 18:14, viresh kumar wrote:
> > On Thu, Feb 16, 2012 at 9:48 AM, Catalin Marinas
> > wrote:
> >> The DMA API implementation on ARM takes care of the cache cleaning and
> >> invalidating.
> >
> > I believe that this is the r
On Feb 20, 2012 11:27 PM, "Russell King - ARM Linux"
wrote:
>
> I hope it's now clear why we need to run over the buffer twice.
Thanks Russell.
Got it now.
--
Viresh
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On Mon, Feb 20, 2012 at 09:48:56AM -0800, viresh kumar wrote:
> On Feb 20, 2012 4:31 PM, "Catalin Marinas" wrote:
> >
> > On 16 February 2012 18:14, viresh kumar wrote:
> > > On Thu, Feb 16, 2012 at 9:48 AM, Catalin Marinas
> > > wrote:
> > >> The DMA API implementation on ARM takes care of the
On 16 February 2012 18:14, viresh kumar wrote:
> On Thu, Feb 16, 2012 at 9:48 AM, Catalin Marinas
> wrote:
>> The DMA API implementation on ARM takes care of the cache cleaning and
>> invalidating.
>
> I believe that this is the reason why we have cache re-invalidation
> (we invalidated
> it in d
On Thu, Feb 16, 2012 at 9:48 AM, Catalin Marinas
wrote:
> The DMA API implementation on ARM takes care of the cache cleaning and
> invalidating.
>
I believe that this is the reason why we have cache re-invalidation
(we invalidated
it in dma_map_*() earlier) in dma_unmap_*() calls for ARMv6+ for
D
Hi Guys,
Sorry for starting the long old thread again, but i have to start it as i
was a bit confused. :(
We know that we can't have multiple mappings with different attributes
to the same physical memory on ARMv6+ machines due to speculative
prefetch.
So, we have following kind of mappings in k
On Thu, Feb 16, 2012 at 9:15 AM, Catalin Marinas
wrote:
> To summarise, if you mix Normal with Device or SO memory, you only get
> the guarantees of the Normal memory (e.g. early write acknowledgement,
> write buffer gathering, speculative accesses), so it's not recommended.
> If you mix Normal Ca
On Thu, Feb 16, 2012 at 05:37:02PM +, viresh kumar wrote:
> On Thu, Feb 16, 2012 at 9:15 AM, Catalin Marinas
> wrote:
> > To summarise, if you mix Normal with Device or SO memory, you only get
> > the guarantees of the Normal memory (e.g. early write acknowledgement,
> > write buffer gathering
On Thu, Feb 16, 2012 at 05:29:28PM +, Catalin Marinas wrote:
> On Thu, Feb 16, 2012 at 05:22:42PM +, Russell King - ARM Linux wrote:
> > On Thu, Feb 16, 2012 at 05:15:20PM +, Catalin Marinas wrote:
> > > On Thu, Feb 16, 2012 at 04:41:02PM +, viresh kumar wrote:
> > > > Sorry for sta
On Thu, Feb 16, 2012 at 05:22:42PM +, Russell King - ARM Linux wrote:
> On Thu, Feb 16, 2012 at 05:15:20PM +, Catalin Marinas wrote:
> > On Thu, Feb 16, 2012 at 04:41:02PM +, viresh kumar wrote:
> > > Sorry for starting the long old thread again, but i have to start it as i
> > > was a
On Thu, Feb 16, 2012 at 05:15:20PM +, Catalin Marinas wrote:
> On Thu, Feb 16, 2012 at 04:41:02PM +, viresh kumar wrote:
> > Sorry for starting the long old thread again, but i have to start it as i
> > was a bit confused. :(
> >
> > We know that we can't have multiple mappings with differ
On Thu, Feb 16, 2012 at 04:41:02PM +, viresh kumar wrote:
> Sorry for starting the long old thread again, but i have to start it as i
> was a bit confused. :(
>
> We know that we can't have multiple mappings with different attributes
> to the same physical memory on ARMv6+ machines due to spec
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