Does the intel-drm support the SVM through the IOMMU and PASID?

Hi, I am a newbie on the intel-gfx and tries to use the shared virtual memory 

which is mentioned in several intel documents (vt-d and Intel-gfx-prm).

Following the above two documents,

shared virtual memory is supported as part of VT-d functionality, and

in detail, IOMMU walks the PASID table and translates the virtual address to physical address 

for the PCIe connected devices including the integrated GPUs. 

Following the Intel document ,

It seems that clSVMAlloc is a OpenCL function for zero copy,

but after I've checked the repository of the opencl-intel (beignet),

I found that it never calls any driver functions for managing  PASID table. 

Is the current intel-gfx supports the shared virtual memory 

through the IOMMU and PASID? 

If the clSVMAlloc is not a right library function for SVM through 

PASID and IOMMU, is there a function that satisfies my intention?

Best regards

Jaehyuk.