Add get_npu_device_id() to device_info.py

src/sonic-py-common/sonic_py_common/device_info.py

@@ -218,6 +218,42 @@ def get_npu_id_from_name(npu_name):
         return None
 
 
+def get_npu_device_id(npu_id):
+    platform = get_platform_info(get_machine_info())
+    if not platform:
+        return None
+
+    asic_conf_file_path = os.path.join(SONIC_DEVICE_PATH, platform, ASIC_CONF_FILENAME)
+    if not os.path.isfile(asic_conf_file_path):
+        return None
+
+    # In a multi-npu device we need to have the file "asic.conf" updated with the asic instance
+    # and the corresponding device id which could be pci_id. Below is an eg: for a 2 ASIC platform/sku.
+    # DEV_ID_ASIC_0=03:00.0
+    # DEV_ID_ASIC_1=04:00.0
+    device_str = "DEV_ID_ASIC_{}".format(npu_id)
+
+    with open(asic_conf_file_path) as asic_conf_file:
+        for line in asic_conf_file:
+            tokens = line.split('=')
+            if len(tokens) < 2:
+               continue
+            if tokens[0] == device_str:
+                device_id = tokens[1].strip()
+                return device_id
+
+
+def get_asic_conf_file_path(platform):
+    asic_conf_path_candidates = []
+    asic_conf_path_candidates.append(os.path.join('/usr/share/sonic/platform', ASIC_CONF_FILENAME))
+    if platform is not None:
+        asic_conf_path_candidates.append(os.path.join(SONIC_DEVICE_PATH, platform, ASIC_CONF_FILENAME))
+    for asic_conf_file_path in asic_conf_path_candidates:
+        if os.path.isfile(asic_conf_file_path):
+            return asic_conf_file_path
+    return None
+
+
 def get_namespaces():
     """
     In a multi NPU platform, each NPU is in a Linux Namespace.