mmap system call parameter vma->vm_start, vm_end is mmap virtual address
start, end, vma->vm_pgoff is rdma buffer GPU address, which is used to
find the sg_table dma_address.
Handle multiple sg table nents case because sg->length is limited to max
2GB.
Change-Id: I677dd6662ee58f0b5c93f8eef32b7009e1e890d8
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Chris Freehill <cfreehil@amd.com>
[ROCm/ROCR-Runtime commit: 9d9fbceefb]
Philip Yang
609390990c