[PATCH v3 2/8] iommu/vt-d: Add multiple domains per device query

Lu Baolu
2018-10-12T05:18:49Z

Add the response to IOMMU_DEV_ATTR_AUXD_CAPABILITY capability query
through iommu_get_dev_attr().

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 38 +++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4b1f7426acea..3133216e5733 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5170,6 +5170,24 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
return phys;
}

+static inline bool scalable_mode_support(void)
+{
+ struct dmar_drhd_unit *drhd;
+ struct intel_iommu *iommu;
+ bool ret = true;
+
+ rcu_read_lock();
+ for_each_active_iommu(iommu, drhd) {
+ if (!sm_supported(iommu)) {
+ ret = false;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
static bool intel_iommu_capable(enum iommu_cap cap)
{
if (cap == IOMMU_CAP_CACHE_COHERENCY)
@@ -5334,6 +5352,25 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
}
#endif /* CONFIG_INTEL_IOMMU_SVM */

+static int intel_iommu_get_dev_attr(struct device *dev,
+ enum iommu_dev_attr attr, void *data)
+{
+ int ret = 0;
+ bool *auxd_capable;
+
+ switch (attr) {
+ case IOMMU_DEV_ATTR_AUXD_CAPABILITY:
+ auxd_capable = data;
+ *auxd_capable = scalable_mode_support();
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
@@ -5348,6 +5385,7 @@ const struct iommu_ops intel_iommu_ops = {
.get_resv_regions = intel_iommu_get_resv_regions,
.put_resv_regions = intel_iommu_put_resv_regions,
.device_group = pci_device_group,
+ .get_dev_attr = intel_iommu_get_dev_attr,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};

--
2.17.1