[RFC PATCH v4 12/13] iommu/arm-smmu-v3: Realize clear_dirty_log iommu ops

[Keqian Zhu]

From: Kunkun Jiang <jiangkunkun@xxxxxxxxxx>

This realizes clear_dirty_log iommu ops based on clear_dirty_log
io-pgtable ops.

Co-developed-by: Keqian Zhu <zhukeqian1@xxxxxxxxxx>
Signed-off-by: Kunkun Jiang <jiangkunkun@xxxxxxxxxx>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 25 +++++++++++++++++++++
 1 file changed, 25 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 3d3c0f8e2446..9b4739247dbb 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2750,6 +2750,30 @@ static int arm_smmu_sync_dirty_log(struct iommu_domain *domain,
 				   bitmap_pgshift);
 }
 
+static int arm_smmu_clear_dirty_log(struct iommu_domain *domain,
+				    unsigned long iova, size_t size,
+				    unsigned long *bitmap,
+				    unsigned long base_iova,
+				    unsigned long bitmap_pgshift)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
+	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 (!ops || !ops->clear_dirty_log) {
+		pr_err("io-pgtable don't realize clear dirty log\n");
+		return -ENODEV;
+	}
+
+	return ops->clear_dirty_log(ops, iova, size, bitmap, base_iova,
+				    bitmap_pgshift);
+}
+
 static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
@@ -2850,6 +2874,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.enable_nesting		= arm_smmu_enable_nesting,
 	.switch_dirty_log	= arm_smmu_switch_dirty_log,
 	.sync_dirty_log		= arm_smmu_sync_dirty_log,
+	.clear_dirty_log	= arm_smmu_clear_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