[PATCH v6 11/13] iommu/vt-d: Add set_dev_pasid callback for nested domain

[Yi Liu <yi.l.liu@xxxxxxxxx>]

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

Co-developed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/iommu/intel/iommu.c  |  6 -----
 drivers/iommu/intel/iommu.h  |  7 +++++
 drivers/iommu/intel/nested.c | 50 ++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index f69ea5b48ee8..527f6f89d8a1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1812,12 +1812,6 @@ static int domain_setup_first_level(struct intel_iommu *iommu,
 					  (pgd_t *)pgd, flags, old);
 }
 
-static 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);
-}
-
 static int dmar_domain_attach_device(struct dmar_domain *domain,
 				     struct device *dev)
 {
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index d23977cc7d90..2cca094c259d 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -22,6 +22,7 @@
 #include <linux/bitfield.h>
 #include <linux/xarray.h>
 #include <linux/perf_event.h>
+#include <linux/pci.h>
 
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
@@ -832,6 +833,12 @@ iommu_domain_did(struct iommu_domain *domain, struct intel_iommu *iommu)
 	return domain_id_iommu(to_dmar_domain(domain), iommu);
 }
 
+static inline 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);
+}
+
 /*
  * 0: readable
  * 1: writable
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 989ca5cc04eb..42c4533a6ea2 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -130,8 +130,58 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
 	return ret;
 }
 
+static 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_setup_nested(iommu, dev, pasid, domain);
+	return intel_pasid_replace_nested(iommu, dev, pasid,
+					  iommu_domain_did(old, iommu),
+					  domain);
+}
+
+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;
+
+	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
+		return -EOPNOTSUPP;
+
+	if (context_copied(iommu, info->bus, info->devfn))
+		return -EBUSY;
+
+	ret = paging_domain_compatible(&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,
 };
-- 
2.34.1