Hi Christoph
I have been testing with real hardware on arm64 your patchset. And uvc
performs 20 times better using Kieran's test
https://github.com/ribalda/linux/tree/uvc-noncontiguous
These are the result of running yavta --capture=1000
dma_alloc_noncontiguous
frames: 999
packets: 999
emp
On Tue, Nov 10, 2020 at 06:50:32PM +0900, Tomasz Figa wrote:
> In what terms it doesn't actually work? Last time I checked some
> platforms actually defined CONFIG_DMA_NONCOHERENT, so those would
> instead use the kmalloc() + dma_map() path. I don't have any
> background on why that was added and w
On Tue, Nov 10, 2020 at 6:33 PM Ricardo Ribalda wrote:
>
> Hi Christoph
>
> On Tue, Nov 10, 2020 at 10:25 AM Christoph Hellwig wrote:
> >
> > On Mon, Nov 09, 2020 at 03:53:55PM +0100, Ricardo Ribalda wrote:
> > > Hi Christoph
> > >
> > > I have started now to give a try to your patchset. Sorry fo
On Tue, Nov 10, 2020 at 10:33:05AM +0100, Ricardo Ribalda wrote:
> Also FYI, I managed to boot an ARM device with that tree. But I could
> not test the uvc driver (it was a remote device with no usb device
> attached)
>
> Hopefully I will be able to test it for real this week.
>
> Any suggestions
Hi Christoph
On Tue, Nov 10, 2020 at 10:25 AM Christoph Hellwig wrote:
>
> On Mon, Nov 09, 2020 at 03:53:55PM +0100, Ricardo Ribalda wrote:
> > Hi Christoph
> >
> > I have started now to give a try to your patchset. Sorry for the delay.
> >
> > For uvc I have prepared this patch:
> > https://gith
On Mon, Nov 09, 2020 at 03:53:55PM +0100, Ricardo Ribalda wrote:
> Hi Christoph
>
> I have started now to give a try to your patchset. Sorry for the delay.
>
> For uvc I have prepared this patch:
> https://github.com/ribalda/linux/commit/9094fe223fe38f8c8ff21366d893b43cbbdf0113
>
> I have tested
Hi Christoph
I have started now to give a try to your patchset. Sorry for the delay.
For uvc I have prepared this patch:
https://github.com/ribalda/linux/commit/9094fe223fe38f8c8ff21366d893b43cbbdf0113
I have tested successfully in a x86_64 noteboot..., yes I know there
is no change for that pla
> On Wed, Sep 30, 2020 at 6:09 PM Christoph Hellwig wrote:
> >
> > Add a new API that returns a virtually non-contigous array of pages
> > and dma address. This API is only implemented for dma-iommu and will
> > not be implemented for non-iommu DMA API instances that have to allocate
> > contiguo
+CC Ricardo who will be looking into using this in the USB stack (UVC
camera driver).
On Wed, Sep 30, 2020 at 6:09 PM Christoph Hellwig wrote:
>
> Add a new API that returns a virtually non-contigous array of pages
> and dma address. This API is only implemented for dma-iommu and will
> not be i
On Wed, Oct 07, 2020 at 02:21:43PM +0200, Tomasz Figa wrote:
> My initial feeling is that it should work, but we'll give you a
> definitive answer once we prototype it. :)
>
> We might actually give it a try in the USB HCD subsystem as well, to
> implement usb_alloc_noncoherent(), as an optimizati
On Wed, Oct 7, 2020 at 8:21 AM Christoph Hellwig wrote:
>
> On Tue, Oct 06, 2020 at 10:56:04PM +0200, Tomasz Figa wrote:
> > > Yes. And make sure the API isn't implemented when VIVT caches are
> > > used, but that isn't really different from the current interface.
> >
> > Okay, thanks. Let's see
On Tue, Oct 06, 2020 at 10:56:04PM +0200, Tomasz Figa wrote:
> > Yes. And make sure the API isn't implemented when VIVT caches are
> > used, but that isn't really different from the current interface.
>
> Okay, thanks. Let's see if we can make necessary changes to the videobuf2.
>
> +Sergey Seno
On Mon, Oct 5, 2020 at 10:26 AM Christoph Hellwig wrote:
>
> On Fri, Oct 02, 2020 at 05:50:40PM +, Tomasz Figa wrote:
> > Hi Christoph,
> >
> > On Wed, Sep 30, 2020 at 06:09:17PM +0200, Christoph Hellwig wrote:
> > > Add a new API that returns a virtually non-contigous array of pages
> > > and
On Fri, Oct 02, 2020 at 05:50:40PM +, Tomasz Figa wrote:
> Hi Christoph,
>
> On Wed, Sep 30, 2020 at 06:09:17PM +0200, Christoph Hellwig wrote:
> > Add a new API that returns a virtually non-contigous array of pages
> > and dma address. This API is only implemented for dma-iommu and will
> >
Hi Christoph,
On Wed, Sep 30, 2020 at 06:09:17PM +0200, Christoph Hellwig wrote:
> Add a new API that returns a virtually non-contigous array of pages
> and dma address. This API is only implemented for dma-iommu and will
> not be implemented for non-iommu DMA API instances that have to allocate
Add a new API that returns a virtually non-contigous array of pages
and dma address. This API is only implemented for dma-iommu and will
not be implemented for non-iommu DMA API instances that have to allocate
contiguous memory. It is up to the caller to check if the API is
available.
The intent
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