On Wed, May 17, 2023 at 01:27:48PM +0200, Petr Tesařík wrote: > On Wed, 17 May 2023 08:35:10 +0200 > Petr Tesařík <petr@xxxxxxxxxxx> wrote: > > Anyway, my greatest objection to allocating additional swiotlb chunks is > > that _all_ of them must be searched to determine that the physical > > address does _not_ belong to a swiotlb, incurring performance penalty > > I thought about this part again, and I overlooked one option. We can > track only the _active_ swiotlbs for each device. If a device never > needs a swiotlb, there is no active swiotlb, and is_swiotlb_buffer() > short-circuits to false. This should avoid all collateral damage to > innocent devices. Does this work with dma-buf or does dma-buf not allow swiotlb bouncing? -- Catalin
