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Subject[RFC PATCH 2/5] iommu/vt-d: Initialize a PASID consumer
Date
This adds the Intel vt-d specific ops to initialize a PASID
consumer.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 49a278a699b0..769b7059d52f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5597,6 +5597,35 @@ static int intel_iommu_domain_get_attr(struct iommu_domain *domain,
return ret;
}

+static int intel_iommu_pasid_init(struct iommu_pasid *pasid)
+{
+ struct dmar_drhd_unit *drhd;
+ struct intel_iommu *iommu = NULL, *temp;
+
+ /*
+ * Iterate the iommu units and get a scalable mode capable one
+ * for virtual command usages. Return failure if scalable mode
+ * doesn't support by any unit.
+ */
+ rcu_read_lock();
+ for_each_active_iommu(temp, drhd) {
+ if (sm_supported(temp)) {
+ iommu = temp;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ if (!iommu)
+ return -ENODEV;
+
+ pasid->max = intel_pasid_max_id;
+ pasid->min = PASID_MIN;
+ pasid->priv = iommu;
+
+ return 0;
+}
+
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
@@ -5616,6 +5645,7 @@ const struct iommu_ops intel_iommu_ops = {
.domain_get_attr = intel_iommu_domain_get_attr,
.get_dev_attr = intel_iommu_get_dev_attr,
.set_dev_attr = intel_iommu_set_dev_attr,
+ .pasid_init = intel_iommu_pasid_init,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};

--
2.17.1
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