Dirty tracking will always be enabled with DBM=1 modifier enabled
by default.
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 22 +++++++++++++++++++++
1 file changed, 22 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 2cde14003469..bf0aac333725 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2787,6 +2787,27 @@ static int arm_smmu_read_and_clear_dirty(struct iommu_domain *domain,
return ret;
}
+static int arm_smmu_set_dirty_tracking(struct iommu_domain *domain,
+ bool enabled)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
+
+ if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
+ return -EINVAL;
+
+ if (!ops) {
+ pr_err_once("io-pgtable don't support dirty tracking\n");
+ return -ENODEV;
+ }
+
+ /*
+ * Always enabled and the dirty bitmap is cleared prior to
+ * set_dirty_tracking().
+ */
+ 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);
@@ -2916,6 +2937,7 @@ static struct iommu_ops arm_smmu_ops = {
.enable_nesting = arm_smmu_enable_nesting,
.free = arm_smmu_domain_free,
.read_and_clear_dirty = arm_smmu_read_and_clear_dirty,
+ .set_dirty_tracking = arm_smmu_set_dirty_tracking,
}
};
--
2.17.2
