[PATCH RFC 04/11] iommu/vt-d: Add SVA domain support

Lu Baolu
2022-03-20T06:43:01Z

Add support for SVA domain allocation and provide an SVA-specific
iommu_domain_ops.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
include/linux/intel-iommu.h | 1 +
drivers/iommu/intel/iommu.c | 12 ++++++++++++
drivers/iommu/intel/svm.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 47 insertions(+)

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 2f9891cb3d00..c14283137fb5 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -744,6 +744,7 @@ void intel_svm_unbind(struct iommu_sva *handle);
u32 intel_svm_get_pasid(struct iommu_sva *handle);
int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
struct iommu_page_response *msg);
+extern const struct iommu_domain_ops intel_svm_domain_ops;

struct intel_svm_dev {
struct list_head list;
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index c1b91bce1530..d55dca3eacf8 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4318,6 +4318,18 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return domain;
case IOMMU_DOMAIN_IDENTITY:
return &si_domain->domain;
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ case IOMMU_DOMAIN_SVA:
+ dmar_domain = alloc_domain(type);
+ if (!dmar_domain) {
+ pr_err("Can't allocate sva domain\n");
+ return NULL;
+ }
+ domain = &dmar_domain->domain;
+ domain->ops = &intel_svm_domain_ops;
+
+ return domain;
+#endif /* CONFIG_INTEL_IOMMU_SVM */
default:
return NULL;
}
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ee5ecde5b318..b9f4dd7057d1 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -932,3 +932,37 @@ int intel_svm_page_response(struct device *dev,
mutex_unlock(&pasid_mutex);
return ret;
}
+
+static int intel_svm_attach_dev_pasid(struct iommu_domain *domain,
+ struct device *dev, ioasid_t pasid)
+{
+ struct device_domain_info *info = dev_iommu_priv_get(dev);
+ struct mm_struct *mm = domain->sva_cookie;
+ struct intel_iommu *iommu = info->iommu;
+ struct iommu_sva *sva;
+
+ mutex_lock(&pasid_mutex);
+ sva = intel_svm_bind_mm(iommu, dev, mm);
+ mutex_unlock(&pasid_mutex);
+
+ return IS_ERR_OR_NULL(sva);
+}
+
+static void intel_svm_detach_dev_pasid(struct iommu_domain *domain,
+ struct device *dev, ioasid_t pasid)
+{
+ mutex_lock(&pasid_mutex);
+ intel_svm_unbind_mm(dev, pasid);
+ mutex_unlock(&pasid_mutex);
+}
+
+static void intel_svm_domain_free(struct iommu_domain *domain)
+{
+ kfree(domain);
+}
+
+const struct iommu_domain_ops intel_svm_domain_ops = {
+ .attach_dev_pasid = intel_svm_attach_dev_pasid,
+ .detach_dev_pasid = intel_svm_detach_dev_pasid,
+ .free = intel_svm_domain_free,
+};
--
2.25.1