Jose, > From: Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx> > Date: Jul/24/2019, 09:54:27 (UTC+00:00) > > > Hi David, > > > > > From: Jon Hunter <jonathanh@xxxxxxxxxx> > > > Date: Tue, 23 Jul 2019 13:09:00 +0100 > > > > > > > Setting "iommu.passthrough=1" works for me. However, I am not sure where > > > > to go from here, so any ideas you have would be great. > > > > > > Then definitely we are accessing outside of a valid IOMMU mapping due > > > to the page pool support changes. > > > > Yes. On the netsec driver i did test with and without SMMU to make sure i am not > > breaking anything. > > Since we map the whole page on the API i think some offset on the driver causes > > that. In any case i'll have another look on page_pool to make sure we are not > > missing anything. > > Ilias, can it be due to this: > > stmmac_main.c: > pp_params.order = DIV_ROUND_UP(priv->dma_buf_sz, PAGE_SIZE); > > page_pool.c: > dma = dma_map_page_attrs(pool->p.dev, page, 0, > (PAGE_SIZE << pool->p.order), > pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC); > > "order", will be at least 1 and then mapping the page can cause overlap > ? well the API is calling the map with the correct page, page offset (0) and size right? I don't see any overlapping here. Aren't we mapping what we allocate? Why do you need higher order pages? Jumbo frames? Can we do a quick test with the order being 0? Thanks, /Ilias
