tiancyin
557f888e1c
In multi-GPU, system heap space is shared between all GPUs, not belongs to specific one GPU, so move it from wddm device (which presents a specific GPU) to thunk runtime which has gloable view, can manage system heap for all GPUs. Introduce a new va_Mgr instance to manage system heap, since local heap and system heap both comply with SVM(Shared Virtual Memory), without this new mgr, every allocation has to call KMD at least once (each GPU needs a call) to allocate GPU VA, the new mgr manage the space itself, no longer call KMD. Reviewed-by: Flora Cui <flora.cui@amd.com> Signed-off-by: tiancyin <tianci.yin@amd.com>