[PATCH v4 11/13] iommu/vt-d: Add set_dev_pasid callback for nested domain

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

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

Add intel_nested_set_dev_pasid() to set a nested type domain to a PASID
of a device.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Co-developed-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/intel/iommu.c  |  2 +-
 drivers/iommu/intel/iommu.h  |  7 ++++++
 drivers/iommu/intel/nested.c | 43 ++++++++++++++++++++++++++++++++++++
 drivers/iommu/intel/pasid.h  | 11 +++++++++
 4 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 7e82b3a4bba7..7f1ca3c342a3 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1944,7 +1944,7 @@ static int domain_setup_first_level(struct intel_iommu *iommu,
 					     flags);
 }
 
-static bool dev_is_real_dma_subdevice(struct device *dev)
+bool dev_is_real_dma_subdevice(struct device *dev)
 {
 	return dev && dev_is_pci(dev) &&
 	       pci_real_dma_dev(to_pci_dev(dev)) != to_pci_dev(dev);
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 8e7ffb421ac4..55478d7b64cf 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -818,6 +818,11 @@ domain_id_iommu(struct dmar_domain *domain, struct intel_iommu *iommu)
 	return info->did;
 }
 
+static inline int domain_type_is_nested(struct dmar_domain *domain)
+{
+	return domain->domain.type == IOMMU_DOMAIN_NESTED;
+}
+
 /*
  * 0: readable
  * 1: writable
@@ -1225,6 +1230,8 @@ void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
  */
 #define QI_OPT_WAIT_DRAIN		BIT(0)
 
+bool dev_is_real_dma_subdevice(struct device *dev);
+
 int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu);
 void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu);
 void device_block_translation(struct device *dev);
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 3ce3c4fd210e..890087f3509f 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -130,8 +130,51 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
 	return ret;
 }
 
+static int intel_nested_set_dev_pasid(struct iommu_domain *domain,
+				      struct device *dev, ioasid_t pasid,
+				      struct iommu_domain *old)
+{
+	struct device_domain_info *info = dev_iommu_priv_get(dev);
+	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+	struct intel_iommu *iommu = info->iommu;
+	struct dev_pasid_info *dev_pasid;
+	int ret;
+
+	/* No SVA domain replacement usage so far */
+	if (old && old->type == IOMMU_DOMAIN_SVA)
+		return -EOPNOTSUPP;
+
+	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
+		return -EOPNOTSUPP;
+
+	if (context_copied(iommu, info->bus, info->devfn))
+		return -EBUSY;
+
+	ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain,
+					   dev);
+	if (ret)
+		return ret;
+
+	dev_pasid = domain_add_dev_pasid(domain, dev, pasid);
+	if (IS_ERR(dev_pasid))
+		return PTR_ERR(dev_pasid);
+
+	ret = domain_setup_nested(iommu, dmar_domain, dev, pasid, old);
+	if (ret)
+		goto out_remove_dev_pasid;
+
+	domain_remove_dev_pasid(old, dev, pasid);
+
+	return 0;
+
+out_remove_dev_pasid:
+	domain_remove_dev_pasid(domain, dev, pasid);
+	return ret;
+}
+
 static const struct iommu_domain_ops intel_nested_domain_ops = {
 	.attach_dev		= intel_nested_attach_dev,
+	.set_dev_pasid		= intel_nested_set_dev_pasid,
 	.free			= intel_nested_domain_free,
 	.cache_invalidate_user	= intel_nested_cache_invalidate_user,
 };
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h
index a3b5945a1812..31a4e7c01853 100644
--- a/drivers/iommu/intel/pasid.h
+++ b/drivers/iommu/intel/pasid.h
@@ -335,6 +335,17 @@ static inline int domain_setup_passthrough(struct intel_iommu *iommu,
 	return intel_pasid_setup_pass_through(iommu, dev, pasid);
 }
 
+static inline int domain_setup_nested(struct intel_iommu *iommu,
+				      struct dmar_domain *domain,
+				      struct device *dev, ioasid_t pasid,
+				      struct iommu_domain *old)
+{
+	if (old)
+		return intel_pasid_replace_nested(iommu, dev,
+						  pasid, domain);
+	return intel_pasid_setup_nested(iommu, dev, pasid, domain);
+}
+
 void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
 				 struct device *dev, u32 pasid,
 				 bool fault_ignore);
-- 
2.34.1