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iommu/tegra: gart: Add debugging facility
authorDmitry Osipenko <digetx@gmail.com>
Mon, 9 Apr 2018 20:07:19 +0000 (23:07 +0300)
committerJoerg Roedel <jroedel@suse.de>
Thu, 3 May 2018 14:30:21 +0000 (16:30 +0200)
commit40c9b882fa74771544b0e41209e99d78685f94be
tree67d03a5173c67e8b156af51de4ba6f786d5685eftree | snapshot
parent6da6c0db5316275015e8cc2959f12a17584aeb64commit | diff
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>
drivers/iommu/tegra-gart.c diff | blob | history
Domain: System / Kernel;