[PATCH 6/6] iommu/vt-d: Add domain_alloc_user op

Yi Liu
2023-09-19T09:26:26Z

This adds the domain_alloc_user op implementation. It supports allocating
domains to be used as parent under nested translation.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/iommu/intel/iommu.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 5db283c17e0d..491bcde1ff96 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4074,6 +4074,25 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return NULL;
}

+static struct iommu_domain *
+intel_iommu_domain_alloc_user(struct device *dev, u32 flags)
+{
+ struct iommu_domain *domain;
+ struct intel_iommu *iommu;
+
+ iommu = device_to_iommu(dev, NULL, NULL);
+ if (!iommu)
+ return ERR_PTR(-ENODEV);
+
+ if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap))
+ return ERR_PTR(-EOPNOTSUPP);
+
+ domain = iommu_domain_alloc(dev->bus);
+ if (!domain)
+ domain = ERR_PTR(-ENOMEM);
+ return domain;
+}
+
static void intel_iommu_domain_free(struct iommu_domain *domain)
{
if (domain != &si_domain->domain && domain != &blocking_domain)
@@ -4807,6 +4826,7 @@ const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.hw_info = intel_iommu_hw_info,
.domain_alloc = intel_iommu_domain_alloc,
+ .domain_alloc_user = intel_iommu_domain_alloc_user,
.probe_device = intel_iommu_probe_device,
.probe_finalize = intel_iommu_probe_finalize,
.release_device = intel_iommu_release_device,
--
2.34.1