From: Kunkun Jiang <[email protected]> This realizes switch_dirty_log by invoking iommu_split_block() and iommu_merge_page(). HTTU HD feature is required.
Co-developed-by: Keqian Zhu <[email protected]> Signed-off-by: Kunkun Jiang <[email protected]> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 38 +++++++++++++++++++++ 1 file changed, 38 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 4d8495d88be2..52c6f3e74d6f 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2590,6 +2590,43 @@ static int arm_smmu_merge_page(struct iommu_domain *domain, return 0; } +static int arm_smmu_switch_dirty_log(struct iommu_domain *domain, bool enable, + unsigned long iova, size_t size, int prot) +{ + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); + struct arm_smmu_device *smmu = smmu_domain->smmu; + + if (!(smmu->features & ARM_SMMU_FEAT_HD)) + return -ENODEV; + if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1) + return -EINVAL; + + if (enable) { + /* + * For SMMU, the hardware dirty management is always enabled if + * hardware supports HTTU HD. The action to start dirty log is + * spliting block mapping. + * + * We don't return error even if the split operation fail, as we + * can still track dirty at block granule, which is still a much + * better choice compared to full dirty policy. + */ + iommu_split_block(domain, iova, size); + } else { + /* + * For SMMU, the hardware dirty management is always enabled if + * hardware supports HTTU HD. The action to start dirty log is + * merging page mapping. + * + * We don't return error even if the merge operation fail, as it + * just effects performace of DMA transaction. + */ + iommu_merge_page(domain, iova, size, prot); + } + + return 0; +} + static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) { return iommu_fwspec_add_ids(dev, args->args, 1); @@ -2691,6 +2728,7 @@ static struct iommu_ops arm_smmu_ops = { .domain_set_attr = arm_smmu_domain_set_attr, .split_block = arm_smmu_split_block, .merge_page = arm_smmu_merge_page, + .switch_dirty_log = arm_smmu_switch_dirty_log, .of_xlate = arm_smmu_of_xlate, .get_resv_regions = arm_smmu_get_resv_regions, .put_resv_regions = generic_iommu_put_resv_regions, -- 2.19.1
