[PATCH v3 08/10] iommu/vt-d: Add nested domain allocation

[Yi Liu <yi.l.liu@intel.com>]

From: Lu Baolu <baolu.lu@linux.intel.com>

This adds the support for IOMMU_HWPT_TYPE_VTD_S1 type.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/intel/iommu.c | 19 +++++++++++++++++++
 include/linux/iommu.h       |  1 +
 2 files changed, 20 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 5f27cee4656a..51612da4a1ea 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4092,6 +4092,16 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
 	return NULL;
 }
 
+static struct iommu_domain *
+intel_iommu_domain_alloc_user(struct device *dev, struct iommu_domain *parent,
+			      const union iommu_domain_user_data *user_data)
+{
+	if (parent)
+		return intel_nested_domain_alloc(parent, user_data);
+	else
+		return iommu_domain_alloc(dev->bus);
+}
+
 static void intel_iommu_domain_free(struct iommu_domain *domain)
 {
 	if (domain != &si_domain->domain && domain != &blocking_domain)
@@ -4736,9 +4746,18 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
 	intel_pasid_tear_down_entry(iommu, dev, pasid, false);
 }
 
+static int intel_iommu_domain_user_data_len(u32 hwpt_type)
+{
+	if (hwpt_type != IOMMU_HWPT_TYPE_VTD_S1)
+		return -EOPNOTSUPP;
+	return sizeof(struct iommu_hwpt_intel_vtd);
+};
+
 const struct iommu_ops intel_iommu_ops = {
 	.capable		= intel_iommu_capable,
 	.domain_alloc		= intel_iommu_domain_alloc,
+	.domain_alloc_user	= intel_iommu_domain_alloc_user,
+	.domain_alloc_user_data_len = intel_iommu_domain_user_data_len,
 	.probe_device		= intel_iommu_probe_device,
 	.probe_finalize		= intel_iommu_probe_finalize,
 	.release_device		= intel_iommu_release_device,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index c696d8e7f43b..32324f0756de 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -234,6 +234,7 @@ union iommu_domain_user_data {
 #ifdef CONFIG_IOMMUFD_TEST
 	__u64 test[2];
 #endif
+	struct iommu_hwpt_intel_vtd vtd;
 };
 
 /**
-- 
2.34.1