[RFC 8/8] iommu/vt-d: Add set_dev_pasid callback for nested domain

Yi Liu
2023-09-26T09:27:28Z

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

This allows the upper layers to set a nested type domain to a PASID of a
device if the PASID feature is supported by the IOMMU hardware.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/iommu/intel/nested.c | 47 ++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)

diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 4853fee216d9..dc99ea1abf68 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -63,6 +63,52 @@ static int intel_nested_attach_dev(struct iommu_domain *domain,
return 0;
}

+static int intel_nested_set_dev_pasid(struct iommu_domain *domain,
+ struct device *dev, ioasid_t pasid)
+{
+ 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;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!pasid_supported(iommu))
+ return -EOPNOTSUPP;
+
+ if (iommu->agaw < dmar_domain->s2_domain->agaw)
+ return -EINVAL;
+
+ ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain, dev);
+ if (ret)
+ return ret;
+
+ dev_pasid = kzalloc(sizeof(*dev_pasid), GFP_KERNEL);
+ if (!dev_pasid)
+ return -ENOMEM;
+
+ ret = domain_attach_iommu(dmar_domain, iommu);
+ if (ret)
+ goto err_free;
+
+ ret = intel_pasid_setup_nested(iommu, dev, pasid, dmar_domain);
+ if (ret)
+ goto err_detach_iommu;
+
+ dev_pasid->dev = dev;
+ dev_pasid->pasid = pasid;
+ spin_lock_irqsave(&dmar_domain->lock, flags);
+ list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
+ spin_unlock_irqrestore(&dmar_domain->lock, flags);
+
+ return 0;
+err_detach_iommu:
+ domain_detach_iommu(dmar_domain, iommu);
+err_free:
+ kfree(dev_pasid);
+ return ret;
+}
+
static void intel_nested_domain_free(struct iommu_domain *domain)
{
kfree(to_dmar_domain(domain));
@@ -127,6 +173,7 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,

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