[PATCH] create symlink from memory section to device [2/2] acpi_memhotplug change.

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

This patch add phys_device symbolic link support to acpi memory hotplug.
This will help shell script for memory hotplug.

example)
%readlink /sys/devices/system/memory/memory10/phys_device
../../../../firmware/acpi/namespace/ACPI/_SB/LSB1/MEM3


Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


Index: testtree/drivers/acpi/acpi_memhotplug.c
===================================================================
--- testtree.orig/drivers/acpi/acpi_memhotplug.c	2006-02-17 15:07:53.000000000 +0900
+++ testtree/drivers/acpi/acpi_memhotplug.c	2006-02-17 15:08:30.000000000 +0900
@@ -30,6 +30,7 @@
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/memory_hotplug.h>
+#include <linux/memory.h>
  #include <acpi/acpi_drivers.h>

  #define ACPI_MEMORY_DEVICE_COMPONENT		0x08000000UL
@@ -180,6 +181,19 @@
  	return_VALUE(0);
  }

+static acpi_status acpi_memory_link_name(struct acpi_memory_device *mem_device)
+{
+	struct acpi_device *device = NULL;
+	acpi_status status;
+	int ret;
+	status = acpi_bus_get_device(mem_device->handle, &device);
+	if (ACPI_FAILURE(status))
+		return status;
+	ret = attach_device_to_memsection(mem_device->start_addr,
+					mem_device->end_addr, &device->kobj);
+	return_VALUE(ret);
+}
+
  static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
  {
  	int result;
@@ -206,7 +220,8 @@
  		mem_device->state = MEMORY_INVALID_STATE;
  		return result;
  	}
-
+	/* link to /sys/devices/system/memory/memoryX  */
+	result = acpi_memory_link_name(mem_device);
  	return result;
  }

@@ -471,6 +486,22 @@
  	return_ACPI_STATUS(status);
  }

+static acpi_status __init acpi_memory_link_name_cb(acpi_handle handle, u32 level,
+						  void *ctxt, void **retv)
+{
+	acpi_status status;
+	struct acpi_memory_device *mem_device;
+	status = is_memory_device(handle);
+	if (ACPI_FAILURE(status))
+		return_ACPI_STATUS(AE_OK); /* continue */
+	if (acpi_memory_get_device(handle, &mem_device)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				  "Error in finding driver data\n"));
+		return_ACPI_STATUS(AE_OK); /* continue */
+	}
+	return acpi_memory_link_name(mem_device);
+}
+
  static int __init acpi_memory_device_init(void)
  {
  	int result;
@@ -494,6 +525,16 @@
  		return_VALUE(-ENODEV);
  	}

+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+				     ACPI_UINT32_MAX,
+				     acpi_memory_link_name_cb,
+				     NULL, NULL);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n"));
+		acpi_bus_unregister_driver(&acpi_memory_device_driver);
+		return_VALUE(-ENODEV);
+	}
+
  	return_VALUE(0);
  }