Hi Robin, On Mon, 22 Aug 2022 11:06:43 +0100, Robin Murphy <robin.murphy@xxxxxxx> wrote: > On 2022-08-21 07:17, Christoph Hellwig wrote: > > On Thu, Aug 18, 2022 at 03:07:40PM +0300, Vadym Kochan wrote: > >> It works with the following changes: > >> > >> #1 dma-ranges = <0x0 0x0 0x2 0x0 0x0 0x80000000>; > >> > >> #3 swiotlb="force" > >> > >> Is it OK to force the memory allocation from the start for the swiotlb ? > > > > It should be ok, but isn't really optimal. > > > > I wonder if we should just allow DT to specify the swiotlb buffer > > location. Basically have yet another RESERVEDMEM_OF_DECLARE variant > > for it, which shouldn't be all that much work except for figuring > > out the interaction with the various kernel command line options. > > We already have all the information we need in the DT (and ACPI), the > arm64 init code just needs to do a better job of interpreting it > properly. I'll see what I can come up with once I've finished what I'm > currently tied up in. > > Thanks, > Robin. Sorry to disturb you, I just 'd like to know if you have some ideas to share or patches to test ? Thank you!
