And I forgot to mention:
On Fri, Mar 12, 2021 at 03:42:14AM +0200, Laurent Pinchart wrote:
> Hi Christoph and Ricardo,
>
> Thank you for the patch.
>
> On Mon, Mar 01, 2021 at 09:52:36AM +0100, Christoph Hellwig wrote:
> > From: Ricardo Ribalda
> >
> > On architectures where the is no coherent
Hi Christoph and Ricardo,
Thank you for the patch.
On Mon, Mar 01, 2021 at 09:52:36AM +0100, Christoph Hellwig wrote:
> From: Ricardo Ribalda
>
> On architectures where the is no coherent caching such as ARM use the
s/the is/there is/
> dma_alloc_noncontiguos API and handle manually the cache
From: Ricardo Ribalda
On architectures where the is no coherent caching such as ARM use the
dma_alloc_noncontiguos API and handle manually the cache flushing using
dma_sync_sgtable().
With this patch on the affected architectures we can measure up to 20x
performance improvement in uvc_video_copy
On Thu, Jan 28, 2021 at 06:00:57PM +0100, Ricardo Ribalda wrote:
> > Given that we vmap the addresses this also needs
> > flush_kernel_vmap_range / invalidate_kernel_vmap_range calls for
> > VIVT architectures.
>
> We only read from the device to the cpu. Then can we run only
> invalidate_kernel_v
HI Christoph
Thanks for your comments
On Thu, Jan 28, 2021 at 4:09 PM Christoph Hellwig wrote:
>
> I just included this patch as-is, but here are a few comments:
>
> On Thu, Jan 28, 2021 at 03:58:37PM +0100, Christoph Hellwig wrote:
> > +static void uvc_urb_dma_sync(struct uvc_urb *uvc_urb, bool
On Thu, Jan 28, 2021 at 4:03 PM Christoph Hellwig wrote:
>
> From: Ricardo Ribalda
>
> On architectures where the is no coherent caching such as ARM use the
> dma_alloc_noncontiguos API and handle manually the cache flushing using
> dma_sync_sgtable().
>
> With this patch on the affected architec
I just included this patch as-is, but here are a few comments:
On Thu, Jan 28, 2021 at 03:58:37PM +0100, Christoph Hellwig wrote:
> +static void uvc_urb_dma_sync(struct uvc_urb *uvc_urb, bool for_device)
> +{
> + struct device *dma_dev = dma_dev = stream_to_dmadev(uvc_urb->stream);
> +
> +
From: Ricardo Ribalda
On architectures where the is no coherent caching such as ARM use the
dma_alloc_noncontiguos API and handle manually the cache flushing using
dma_sync_sgtable().
With this patch on the affected architectures we can measure up to 20x
performance improvement in uvc_video_copy
