On 2023/4/1 7:11, Jacob Pan wrote:
Devices that use ENQCMDS to submit work on buffers mapped by DMA API
must attach a PASID to the default domain of the device. In preparation
for this use case, this patch implements set_dev_pasid() for the
default_domain_ops.
If the device context has not been set up prior to this call, this will
set up the device context in addition to PASID attachment.
Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
---
drivers/iommu/intel/iommu.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 52b9d0d3a02c..1ad9c5a4bd8f 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4784,6 +4784,26 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
domain_detach_iommu(dmar_domain, info->iommu);
}
+static int intel_iommu_attach_device_pasid(struct iommu_domain *domain,
+ struct device *dev, ioasid_t pasid)
+{
+ 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;
+ int ret;
+
+ if (!pasid_supported(iommu))
+ return -ENODEV;
As the domain ID will be set to the pasid entry, need to get a refcount
of the domain ID. Call domain_attach_iommu() here, and release it after
the pasid entry is torn down.
+ ret = prepare_domain_attach_device(domain, dev);
+ if (ret)
+ return ret;
+
+ return dmar_domain_attach_device_pasid(dmar_domain, dev, pasid);
+}
+
+
+
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
@@ -4803,6 +4823,7 @@ const struct iommu_ops intel_iommu_ops = {
#endif
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = intel_iommu_attach_device,
+ .set_dev_pasid = intel_iommu_attach_device_pasid,
.map_pages = intel_iommu_map_pages,
.unmap_pages = intel_iommu_unmap_pages,
.iotlb_sync_map = intel_iommu_iotlb_sync_map,
Best regards,
baolu
