amdgpu_seq64_get_va_base
*va = bit_pos * sizeof(u64) + amdgpu_seq64_get_va_base(adev);
bit_pos = (va - amdgpu_seq64_get_va_base(adev)) / sizeof(u64);
seq64_addr = amdgpu_seq64_get_va_base(adev) & AMDGPU_GMC_HOLE_MASK;