[PATCH v3 06/10] iommu/vt-d: Set the nested domain to a device

Yi Liu
2023-05-11T14:53:04Z

hence enable nested domain usage on Intel VT-d.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
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 f83931bb44b6..fd38424b78f0 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -11,8 +11,53 @@
#define pr_fmt(fmt) "DMAR: " fmt

#include <linux/iommu.h>
+#include <linux/pci.h>
+#include <linux/pci-ats.h>

#include "iommu.h"
+#include "pasid.h"
+
+static int intel_nested_attach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ 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;
+ unsigned long flags;
+ int ret = 0;
+
+ if (info->domain)
+ device_block_translation(dev);
+
+ /* Is s2_domain compatible with this IOMMU? */
+ ret = prepare_domain_attach_device(&dmar_domain->s2_domain->domain, dev);
+ if (ret) {
+ dev_err_ratelimited(dev, "s2 domain is not compatible\n");
+ return ret;
+ }
+
+ ret = domain_attach_iommu(dmar_domain, iommu);
+ if (ret) {
+ dev_err_ratelimited(dev, "Failed to attach domain to iommu\n");
+ return ret;
+ }
+
+ ret = intel_pasid_setup_nested(iommu, dev,
+ PASID_RID2PASID, dmar_domain);
+ if (ret) {
+ domain_detach_iommu(dmar_domain, iommu);
+ dev_err_ratelimited(dev, "Failed to setup pasid entry\n");
+ return ret;
+ }
+
+ info->domain = dmar_domain;
+ spin_lock_irqsave(&dmar_domain->lock, flags);
+ list_add(&info->link, &dmar_domain->devices);
+ spin_unlock_irqrestore(&dmar_domain->lock, flags);
+ domain_update_iommu_cap(dmar_domain);
+
+ return 0;
+}

static void intel_nested_domain_free(struct iommu_domain *domain)
{
@@ -20,7 +65,9 @@ static void intel_nested_domain_free(struct iommu_domain *domain)
}

static const struct iommu_domain_ops intel_nested_domain_ops = {
+ .attach_dev = intel_nested_attach_dev,
.free = intel_nested_domain_free,
+ .enforce_cache_coherency = intel_iommu_enforce_cache_coherency,
};

struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *s2_domain,
--
2.34.1