Commit 446152d5 authored Oct 16, 2019 by Navneet Kumar Committed by Joerg Roedel Oct 18, 2019

iommu/tegra-smmu: Use non-secure register for flushing



Use PTB_ASID instead of SMMU_CONFIG to flush smmu.
PTB_ASID can be accessed from non-secure mode, SMMU_CONFIG cannot be.
Using SMMU_CONFIG could pose a problem when kernel doesn't have secure
mode access enabled from boot.

Signed-off-by: Navneet Kumar <navneetk@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 4f5cafb5

drivers/iommu/tegra-smmu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -240,7 +240,7 @@ static inline void smmu_flush_tlb_group(struct tegra_smmu *smmu,

		static inline void smmu_flush(struct tegra_smmu *smmu)
		{
		smmu_readl(smmu, SMMU_CONFIG);
		smmu_readl(smmu, SMMU_PTB_ASID);
		}

		static int tegra_smmu_alloc_asid(struct tegra_smmu smmu, unsigned int idp)