[PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64

[Petr Tesařík]

Hi Alex!

Nice to meet you again...

On Thu, 1 Dec 2022 00:32:07 +0100
Alexander Graf <agraf at csgraf.de> wrote:

> Hi Isaac,
> 
> On 30.11.22 19:48, Isaac Manjarres wrote:
> > On Tue, Nov 08, 2022 at 11:03:31AM +0100, Christoph Hellwig wrote:  
> >> On Tue, Nov 08, 2022 at 09:52:15AM +0000, Catalin Marinas wrote:  
> >>> Since it's hard to guess the optimal swiotlb buffer for such platforms,
> >>> I think a follow-up step would be to use the DMA coherent pool for
> >>> bouncing if no swiotlb buffer is available. At least the pool can grow
> >>> dynamically. Yet another option would be to increase the swiotlb buffer
> >>> at run-time but it has an overhead for is_swiotlb_buffer().  
> >> Alex said he wanted to look into growing the swiotlb buffer on demand
> >> for other reason, so adding him to Cc to check if there has been any
> >> progress on that.  
> > Hi Alex,
> >
> > Did you get a chance to look into this? If so, have you been able to
> > make progress on being able to grow the SWIOTLB buffer on demand?  
> 
> 
> I've been slightly under water and haven't been able to look at this yet 
> :). It's on my list, but will probably be a while until I get to it. 
> Would you be interested in having a first try?

All right, I have just found this thread now after having sent my own
patch series to make SWIOTLB dynamic. I hope you don't mind. I didn't
want to "steal" the project from you.

Petr T