On 13.10.2017 11:38, Joerg Roedel wrote: > On Thu, Oct 12, 2017 at 05:27:26PM +0300, Dmitry Osipenko wrote: >> I'm not talking about any specific bug, but in general if allocator re-maps >> already mapped region or unmaps the wrong-and-used region. I had those >> bug-cases >> during of development of the 'scattered' graphics allocations for Tegra20. > > The dma-iommu code does not re-map already mapped regions and it doesn't > unmap wrong regions. If it does it should be reported and fixed. >
Certainly iommu_map_sg doesn't perform itself any debug checks that I'm proposing to add to the GART. Yet we don't use GART in the mainline, right now you may take a look at the WIP patches here: https://github.com/grate-driver/linux/commit/9853371164a7f1b5698caee476e7cffe1b446afa https://github.com/grate-driver/linux/commit/ea1fca4ac932464e7907a7ada8ea2698cab8db65 > So if you hit any bug there, please report it so that it can be fixed. > _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
