From: Kunkun Jiang <[email protected]> We have implemented these interfaces required to support iommu dirty log tracking. The last step is reporting this feature to upper user, then the user can perform higher policy base on it.
There is a new dev feature named IOMMU_DEV_FEAT_HWDBM in iommu layer. For arm smmuv3, it is equal to ARM_SMMU_FEAT_HD and it is enabled by default if supported. Other types of IOMMU can enable it by default or when user invokes enable_feature. Co-developed-by: Keqian Zhu <[email protected]> Signed-off-by: Kunkun Jiang <[email protected]> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 59bb1d198631..2d716ee5621f 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2712,6 +2712,9 @@ static bool arm_smmu_dev_has_feature(struct device *dev, switch (feat) { case IOMMU_DEV_FEAT_SVA: return arm_smmu_master_sva_supported(master); + case IOMMU_DEV_FEAT_HWDBM: + /* No requirement for device, require HTTU HD of smmu */ + return !!(master->smmu->features & ARM_SMMU_FEAT_HD); default: return false; } @@ -2728,6 +2731,9 @@ static bool arm_smmu_dev_feature_enabled(struct device *dev, switch (feat) { case IOMMU_DEV_FEAT_SVA: return arm_smmu_master_sva_enabled(master); + case IOMMU_DEV_FEAT_HWDBM: + /* HTTU HD is enabled if supported */ + return arm_smmu_dev_has_feature(dev, feat); default: return false; } -- 2.19.1
