On 4/28/2022 7:45 AM, Christoph Hellwig wrote:
On Thu, Apr 28, 2022 at 03:44:36PM +0100, Robin Murphy wrote:
Rather than introduce this extra level of allocator complexity, how about
just dividing up the initial SWIOTLB allocation into multiple io_tlb_mem
instances?
Yeah. We're almost done removing all knowledge of swiotlb from drivers,
so the very last thing I want is an interface that allows a driver to
allocate a per-device buffer.
At least for TDX need parallelism with a single device for performance.
So if you split up the io tlb mems for a device then you would need a
new mechanism to load balance the requests for single device over those.
I doubt it would be any simpler.
-Andi
