updateInterface: enable hot-add nic on arm64

For now, update interface in agent will fail when hot-add
nic to a running containers on arm64 as rescan pci bus will
occur between up hf and bf of shpc hotplug interrupt handling.

Another problem is that as pcie bridge is used when create vm
for arm64, the rootBusPath will be
"/devices/platform/4010000000.pcie/pci0000:00".

This patch remove the implementation of rescan and change the
rootBusPath for arm64.

Fixes: kata-containers#544
Signed-off-by: Jianyong Wu <[email protected]>

device.go

@@ -34,14 +34,8 @@ const (
 	driverLocalType     = "local"
 )
 
-const (
-	rootBusPath = "/devices/pci0000:00"
-	pciBusMode  = 0220
-)
-
 var (
 	sysBusPrefix     = sysfsDir + "/bus/pci/devices"
-	pciBusRescanFile = sysfsDir + "/bus/pci/rescan"
 	pciBusPathFormat = "%s/%s/pci_bus/"
 	systemDevPath    = "/dev"
 )
@@ -68,10 +62,6 @@ var deviceHandlerList = map[string]deviceHandler{
 	driverNvdimmType:  nvdimmDeviceHandler,
 }
 
-func rescanPciBus() error {
-	return ioutil.WriteFile(pciBusRescanFile, []byte{'1'}, pciBusMode)
-}
-
 // getDevicePCIAddress fetches the complete PCI address in sysfs, based on the PCI
 // identifier provided. This should be in the format: "bridgeAddr/deviceAddr".
 // Here, bridgeAddr is the address at which the brige is attached on the root bus,

device_amd64.go

@@ -0,0 +1,20 @@
+//
+// Copyright (c) 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import "ioutil"
+
+const (
+	rootBusPath = "/devices/pci0000:00"
+	pciBusMode  = 0220
+)
+
+var pciBusRescanFile = sysfsDir + "/bus/pci/rescan"
+
+func rescanPciBus() error {
+	return ioutil.WriteFile(pciBusRescanFile, []byte{'1'}, pciBusMode)
+}

device_arm64.go

@@ -0,0 +1,13 @@
+//
+// Copyright (c) 2019 ARM Limited
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+const rootBusPath = "/devices/platform/4010000000.pcie/pci0000:00"
+
+func rescanPciBus() error {
+	return nil
+}

device_ppc64le.go

@@ -0,0 +1,20 @@
+//
+// Copyright (c) 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import "ioutil"
+
+const (
+	rootBusPath = "/devices/pci0000:00"
+	pciBusMode  = 0220
+)
+
+var pciBusRescanFile = sysfsDir + "/bus/pci/rescan"
+
+func rescanPciBus() error {
+	return ioutil.WriteFile(pciBusRescanFile, []byte{'1'}, pciBusMode)
+}

device_s390x.go

@@ -0,0 +1,20 @@
+//
+// Copyright (c) 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package main
+
+import "ioutil"
+
+const (
+	rootBusPath = "/devices/pci0000:00"
+	pciBusMode  = 0220
+)
+
+var pciBusRescanFile = sysfsDir + "/bus/pci/rescan"
+
+func rescanPciBus() error {
+	return ioutil.WriteFile(pciBusRescanFile, []byte{'1'}, pciBusMode)
+}