Commits
Dmitry Osipenko committed 40c9b882fa7
iommu/tegra: gart: Add debugging facility Page mapping could overwritten by an accident (a bug). We can catch this case by checking 'VALID' bit of GART's page entry prior to mapping of a page. Since that check introduces a small performance impact, it should be enabled explicitly using new GART's kernel module 'debug' parameter. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>