iommu/tegra: gart: Add debugging facility

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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>

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Dmitry Osipenko 2018-04-09 23:07:19 +03:00 • committed by Joerg Roedel

parent 6da6c0db53

commit 40c9b882fa

1 changed files with 13 additions and 0 deletions

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drivers/iommu/tegra-gart.c

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