add vxpu

vllm_kunlun/csrc/vxpu_offload/xpu_helper.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "spdlog/spdlog.h"
+#include <stdint.h>
+
+#include "xpu/runtime.h"
+
+static inline uint32_t get_device_pci_addr(int device_id) {
+  uint64_t v;
+  int ret = xpu_device_get_attr(&v, XPUATTR_PCI_ADDRESS, device_id);
+  if (ret != XPU_SUCCESS) {
+    spdlog::error("Failed to get PCI address for device {}: {}", device_id,
+                  xpu_strerror(ret));
+    return static_cast<uint32_t>(-1);
+  }
+  return static_cast<uint32_t>(v);
+}