Hello,
I'm really sorry do late joining this discussion, but I was terribly
busy with other things.
On 2015-10-30 02:17, Daniel Kurtz wrote:
+linux-media & VIDEOBUF2 FRAMEWORK maintainers since this is about the
v4l2-contig's usage of the DMA API.
Hi Robin,
On Tue, Oct 27, 2015 at 12:55 AM,
On 04/11/15 05:12, Tomasz Figa wrote:
On Wed, Nov 4, 2015 at 2:41 AM, Robin Murphy wrote:
Hi Tomasz,
On 02/11/15 13:43, Tomasz Figa wrote:
I'd like to know what is the boundary mask and what hardware imposes
requirements like this. The cost here is not only over-allocating a
little, but maki
On Wed, Nov 04, 2015 at 06:48:50PM +0900, Tomasz Figa wrote:
> There is no requirement, but shouldn't it be desired for the mapping
> code to map them as such? Otherwise, how could the IOMMU use case you
> described above (address translator for devices which don't have the
> capability to address
On Wed, Nov 4, 2015 at 6:27 PM, Russell King - ARM Linux
wrote:
> On Wed, Nov 04, 2015 at 02:12:03PM +0900, Tomasz Figa wrote:
>> My understanding of a scatterlist was that it represents a buffer as a
>> whole, by joining together its physically discontinuous segments.
>
> Correct, and it may also
On Wed, Nov 04, 2015 at 02:12:03PM +0900, Tomasz Figa wrote:
> My understanding of a scatterlist was that it represents a buffer as a
> whole, by joining together its physically discontinuous segments.
Correct, and it may also be scattered in CPU virtual space as well.
> I don't see how single se
On Wed, Nov 04, 2015 at 02:15:41PM +0900, Tomasz Figa wrote:
> On Wed, Nov 4, 2015 at 3:40 AM, Russell King - ARM Linux
> wrote:
> > On Tue, Nov 03, 2015 at 05:41:24PM +, Robin Murphy wrote:
> >> Hi Tomasz,
> >>
> >> On 02/11/15 13:43, Tomasz Figa wrote:
> >> >Agreed. The dma_map_*() API is no
On Wed, Nov 4, 2015 at 3:40 AM, Russell King - ARM Linux
wrote:
> On Tue, Nov 03, 2015 at 05:41:24PM +, Robin Murphy wrote:
>> Hi Tomasz,
>>
>> On 02/11/15 13:43, Tomasz Figa wrote:
>> >Agreed. The dma_map_*() API is not guaranteed to return a single
>> >contiguous part of virtual address spac
On Wed, Nov 4, 2015 at 2:41 AM, Robin Murphy wrote:
> Hi Tomasz,
>
> On 02/11/15 13:43, Tomasz Figa wrote:
>>
>> I'd like to know what is the boundary mask and what hardware imposes
>> requirements like this. The cost here is not only over-allocating a
>> little, but making many, many buffers cont
On Tue, Nov 03, 2015 at 05:41:24PM +, Robin Murphy wrote:
> Hi Tomasz,
>
> On 02/11/15 13:43, Tomasz Figa wrote:
> >Agreed. The dma_map_*() API is not guaranteed to return a single
> >contiguous part of virtual address space for any given SG list.
> >However it was understood to be able to map
Hi Tomasz,
On 02/11/15 13:43, Tomasz Figa wrote:
I'd like to know what is the boundary mask and what hardware imposes
requirements like this. The cost here is not only over-allocating a
little, but making many, many buffers contiguously mappable on the
CPU, unmappable contiguously in IOMMU, whic
On Mon, Nov 2, 2015 at 10:11 PM, Daniel Kurtz wrote:
>
> +Tomasz, so he can reply to the thread
> +Marek and Russell as recommended by Tomasz
>
> On Oct 30, 2015 22:27, "Robin Murphy" wrote:
> >
> > Hi Dan,
> >
> > On 30/10/15 01:17, Daniel Kurtz wrote:
> >>
> >> +linux-media & VIDEOBUF2 FRAMEWOR
+Tomasz, so he can reply to the thread
+Marek and Russell as recommended by Tomasz
On Oct 30, 2015 22:27, "Robin Murphy" wrote:
>
> Hi Dan,
>
> On 30/10/15 01:17, Daniel Kurtz wrote:
>>
>> +linux-media & VIDEOBUF2 FRAMEWORK maintainers since this is about the
>> v4l2-contig's usage of the DMA API
Hi Dan,
On 30/10/15 01:17, Daniel Kurtz wrote:
+linux-media & VIDEOBUF2 FRAMEWORK maintainers since this is about the
v4l2-contig's usage of the DMA API.
Hi Robin,
On Tue, Oct 27, 2015 at 12:55 AM, Robin Murphy wrote:
On 26/10/15 13:44, Yong Wu wrote:
On Thu, 2015-10-01 at 20:13 +0100, Rob
On Fri, Oct 30, 2015 at 09:17:52AM +0800, Daniel Kurtz wrote:
> Hmm, I thought the DMA API maps a (possibly) non-contiguous set of
> memory pages into a contiguous block in device memory address space.
> This would allow passing a dma mapped buffer to device dma using just
> a device address and le
+linux-media & VIDEOBUF2 FRAMEWORK maintainers since this is about the
v4l2-contig's usage of the DMA API.
Hi Robin,
On Tue, Oct 27, 2015 at 12:55 AM, Robin Murphy wrote:
> On 26/10/15 13:44, Yong Wu wrote:
>>
>> On Thu, 2015-10-01 at 20:13 +0100, Robin Murphy wrote:
>> [...]
>>>
>>> +/*
>>> + *
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