Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com> |
| 3 | * |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or (at |
| 9 | * your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 14 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 15 | * details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | * |
| 21 | * |
| 22 | * ACPI based HotPlug driver that supports Memory Hotplug |
Nick Andrew | c7060d9 | 2009-01-03 18:53:39 +1100 | [diff] [blame] | 23 | * This driver fields notifications from firmware for memory add |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * and remove operations and alerts the VM of the affected memory |
| 25 | * ranges. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/memory_hotplug.h> |
| 33 | #include <acpi/acpi_drivers.h> |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
| 36 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
| 38 | |
| 39 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT |
| 40 | |
Zhao Yakui | aa7b2b2 | 2009-07-03 10:49:03 +0800 | [diff] [blame] | 41 | #undef PREFIX |
| 42 | #define PREFIX "ACPI:memory_hp:" |
| 43 | |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 44 | ACPI_MODULE_NAME("acpi_memhotplug"); |
| 45 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); |
Len Brown | 7cda93e | 2007-02-12 23:50:02 -0500 | [diff] [blame] | 46 | MODULE_DESCRIPTION("Hotplug Mem Driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | MODULE_LICENSE("GPL"); |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | /* Memory Device States */ |
| 50 | #define MEMORY_INVALID_STATE 0 |
| 51 | #define MEMORY_POWER_ON_STATE 1 |
| 52 | #define MEMORY_POWER_OFF_STATE 2 |
| 53 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 54 | static int acpi_memory_device_add(struct acpi_device *device); |
| 55 | static int acpi_memory_device_remove(struct acpi_device *device, int type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 57 | static const struct acpi_device_id memory_device_ids[] = { |
| 58 | {ACPI_MEMORY_DEVICE_HID, 0}, |
| 59 | {"", 0}, |
| 60 | }; |
| 61 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | static struct acpi_driver acpi_memory_device_driver = { |
Len Brown | c2b6705 | 2007-02-12 23:33:40 -0500 | [diff] [blame] | 64 | .name = "acpi_memhotplug", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 65 | .class = ACPI_MEMORY_DEVICE_CLASS, |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 66 | .ids = memory_device_ids, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 67 | .ops = { |
| 68 | .add = acpi_memory_device_add, |
| 69 | .remove = acpi_memory_device_remove, |
| 70 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | }; |
| 72 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 73 | struct acpi_memory_info { |
| 74 | struct list_head list; |
| 75 | u64 start_addr; /* Memory Range start physical addr */ |
| 76 | u64 length; /* Memory Range length */ |
| 77 | unsigned short caching; /* memory cache attribute */ |
| 78 | unsigned short write_protect; /* memory read/write attribute */ |
| 79 | unsigned int enabled:1; |
| 80 | }; |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | struct acpi_memory_device { |
Patrick Mochel | 3b74863 | 2006-05-19 16:54:38 -0400 | [diff] [blame] | 83 | struct acpi_device * device; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 84 | unsigned int state; /* State of the memory device */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 85 | struct list_head res_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
Yasunori Goto | 887b959 | 2006-10-19 23:28:31 -0700 | [diff] [blame] | 88 | static int acpi_hotmem_initialized; |
| 89 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 90 | static acpi_status |
| 91 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) |
| 92 | { |
| 93 | struct acpi_memory_device *mem_device = context; |
| 94 | struct acpi_resource_address64 address64; |
| 95 | struct acpi_memory_info *info, *new; |
| 96 | acpi_status status; |
| 97 | |
| 98 | status = acpi_resource_to_address64(resource, &address64); |
| 99 | if (ACPI_FAILURE(status) || |
| 100 | (address64.resource_type != ACPI_MEMORY_RANGE)) |
| 101 | return AE_OK; |
| 102 | |
| 103 | list_for_each_entry(info, &mem_device->res_list, list) { |
| 104 | /* Can we combine the resource range information? */ |
| 105 | if ((info->caching == address64.info.mem.caching) && |
| 106 | (info->write_protect == address64.info.mem.write_protect) && |
| 107 | (info->start_addr + info->length == address64.minimum)) { |
| 108 | info->length += address64.address_length; |
| 109 | return AE_OK; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); |
| 114 | if (!new) |
| 115 | return AE_ERROR; |
| 116 | |
| 117 | INIT_LIST_HEAD(&new->list); |
| 118 | new->caching = address64.info.mem.caching; |
| 119 | new->write_protect = address64.info.mem.write_protect; |
| 120 | new->start_addr = address64.minimum; |
| 121 | new->length = address64.address_length; |
| 122 | list_add_tail(&new->list, &mem_device->res_list); |
| 123 | |
| 124 | return AE_OK; |
| 125 | } |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | static int |
| 128 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) |
| 129 | { |
| 130 | acpi_status status; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 131 | struct acpi_memory_info *info, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
KAMEZAWA Hiroyuki | 5d2870f | 2006-08-05 12:15:04 -0700 | [diff] [blame] | 134 | if (!list_empty(&mem_device->res_list)) |
| 135 | return 0; |
| 136 | |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 137 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 138 | acpi_memory_get_resource, mem_device); |
| 139 | if (ACPI_FAILURE(status)) { |
| 140 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) |
| 141 | kfree(info); |
KAMEZAWA Hiroyuki | 5d2870f | 2006-08-05 12:15:04 -0700 | [diff] [blame] | 142 | INIT_LIST_HEAD(&mem_device->res_list); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 143 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 146 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | static int |
| 150 | acpi_memory_get_device(acpi_handle handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 151 | struct acpi_memory_device **mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
| 153 | acpi_status status; |
| 154 | acpi_handle phandle; |
| 155 | struct acpi_device *device = NULL; |
| 156 | struct acpi_device *pdevice = NULL; |
Zhao Yakui | aa7b2b2 | 2009-07-03 10:49:03 +0800 | [diff] [blame] | 157 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | if (!acpi_bus_get_device(handle, &device) && device) |
| 161 | goto end; |
| 162 | |
| 163 | status = acpi_get_parent(handle, &phandle); |
| 164 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 165 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 166 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | /* Get the parent device */ |
Zhao Yakui | aa7b2b2 | 2009-07-03 10:49:03 +0800 | [diff] [blame] | 170 | result = acpi_bus_get_device(phandle, &pdevice); |
| 171 | if (result) { |
| 172 | printk(KERN_WARNING PREFIX "Cannot get acpi bus device"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 173 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Now add the notified device. This creates the acpi_device |
| 178 | * and invokes .add function |
| 179 | */ |
Zhao Yakui | aa7b2b2 | 2009-07-03 10:49:03 +0800 | [diff] [blame] | 180 | result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
| 181 | if (result) { |
| 182 | printk(KERN_WARNING PREFIX "Cannot add acpi bus"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 183 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 186 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | *mem_device = acpi_driver_data(device); |
| 188 | if (!(*mem_device)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 189 | printk(KERN_ERR "\n driver data not found"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 190 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 193 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 196 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 198 | unsigned long long current_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | /* Get device present/absent information from the _STA */ |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 201 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 202 | NULL, ¤t_status))) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 203 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* |
| 205 | * Check for device status. Device should be |
| 206 | * present/enabled/functioning. |
| 207 | */ |
Bjorn Helgaas | a0bd4ac | 2007-04-25 14:17:39 -0400 | [diff] [blame] | 208 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) |
| 209 | && (current_status & ACPI_STA_DEVICE_ENABLED) |
| 210 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 211 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 213 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 216 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | { |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 218 | int result, num_enabled = 0; |
| 219 | struct acpi_memory_info *info; |
Yasunori Goto | 1e3590e | 2006-06-27 02:53:31 -0700 | [diff] [blame] | 220 | int node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* Get the range from the _CRS */ |
| 224 | result = acpi_memory_get_device_resources(mem_device); |
| 225 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 226 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | mem_device->state = MEMORY_INVALID_STATE; |
| 228 | return result; |
| 229 | } |
| 230 | |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 231 | node = acpi_get_node(mem_device->device->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* |
| 233 | * Tell the VM there is more memory here... |
| 234 | * Note: Assume that this function returns zero on success |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 235 | * We don't have memory-hot-add rollback function,now. |
| 236 | * (i.e. memory-hot-remove function) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 238 | list_for_each_entry(info, &mem_device->res_list, list) { |
KAMEZAWA Hiroyuki | fa25d8d | 2006-08-05 12:15:02 -0700 | [diff] [blame] | 239 | if (info->enabled) { /* just sanity check...*/ |
Yasunori Goto | dd56a8e | 2006-06-27 02:53:29 -0700 | [diff] [blame] | 240 | num_enabled++; |
| 241 | continue; |
| 242 | } |
Zhao Yakui | 5d2619f | 2009-07-07 10:56:11 +0800 | [diff] [blame] | 243 | /* |
| 244 | * If the memory block size is zero, please ignore it. |
| 245 | * Don't try to do the following memory hotplug flowchart. |
| 246 | */ |
| 247 | if (!info->length) |
| 248 | continue; |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 249 | if (node < 0) |
| 250 | node = memory_add_physaddr_to_nid(info->start_addr); |
| 251 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 252 | result = add_memory(node, info->start_addr, info->length); |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 253 | if (result) |
| 254 | continue; |
| 255 | info->enabled = 1; |
| 256 | num_enabled++; |
| 257 | } |
| 258 | if (!num_enabled) { |
akpm@osdl.org | 0a1f1ab | 2006-06-30 03:15:00 -0400 | [diff] [blame] | 259 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | mem_device->state = MEMORY_INVALID_STATE; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 261 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
Zhao Yakui | 5d2619f | 2009-07-07 10:56:11 +0800 | [diff] [blame] | 263 | /* |
| 264 | * Sometimes the memory device will contain several memory blocks. |
| 265 | * When one memory block is hot-added to the system memory, it will |
| 266 | * be regarded as a success. |
| 267 | * Otherwise if the last memory block can't be hot-added to the system |
| 268 | * memory, it will be failure and the memory device can't be bound with |
| 269 | * driver. |
| 270 | */ |
| 271 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 274 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
| 276 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 277 | struct acpi_object_list arg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | union acpi_object arg; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 279 | unsigned long long current_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | /* Issue the _EJ0 command */ |
| 283 | arg_list.count = 1; |
| 284 | arg_list.pointer = &arg; |
| 285 | arg.type = ACPI_TYPE_INTEGER; |
| 286 | arg.integer.value = 1; |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 287 | status = acpi_evaluate_object(mem_device->device->handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 288 | "_EJ0", &arg_list, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | /* Return on _EJ0 failure */ |
| 290 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 291 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 292 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | /* Evalute _STA to check if the device is disabled */ |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 296 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 297 | NULL, ¤t_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 299 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | /* Check for device status. Device should be disabled */ |
Bjorn Helgaas | a0bd4ac | 2007-04-25 14:17:39 -0400 | [diff] [blame] | 302 | if (current_status & ACPI_STA_DEVICE_ENABLED) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 303 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 305 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 308 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
| 310 | int result; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 311 | struct acpi_memory_info *info, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | /* |
| 315 | * Ask the VM to offline this memory range. |
| 316 | * Note: Assume that this function returns zero on success |
| 317 | */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 318 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
| 319 | if (info->enabled) { |
| 320 | result = remove_memory(info->start_addr, info->length); |
| 321 | if (result) |
| 322 | return result; |
| 323 | } |
| 324 | kfree(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | /* Power-off and eject the device */ |
| 328 | result = acpi_memory_powerdown_device(mem_device); |
| 329 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* Set the status of the device to invalid */ |
| 331 | mem_device->state = MEMORY_INVALID_STATE; |
| 332 | return result; |
| 333 | } |
| 334 | |
| 335 | mem_device->state = MEMORY_POWER_OFF_STATE; |
| 336 | return result; |
| 337 | } |
| 338 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 339 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
| 341 | struct acpi_memory_device *mem_device; |
| 342 | struct acpi_device *device; |
| 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | switch (event) { |
| 346 | case ACPI_NOTIFY_BUS_CHECK: |
| 347 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 348 | "\nReceived BUS CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | /* Fall Through */ |
| 350 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 351 | if (event == ACPI_NOTIFY_DEVICE_CHECK) |
| 352 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 353 | "\nReceived DEVICE CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | if (acpi_memory_get_device(handle, &mem_device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 355 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 356 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | if (!acpi_memory_check_device(mem_device)) { |
| 360 | if (acpi_memory_enable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 361 | printk(KERN_ERR PREFIX |
| 362 | "Cannot enable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | break; |
| 365 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 366 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 367 | "\nReceived EJECT REQUEST notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | if (acpi_bus_get_device(handle, &device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 370 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | break; |
| 372 | } |
| 373 | mem_device = acpi_driver_data(device); |
| 374 | if (!mem_device) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 375 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | break; |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * Currently disabling memory device from kernel mode |
| 381 | * TBD: Can also be disabled from user mode scripts |
| 382 | * TBD: Can also be disabled by Callback registration |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 383 | * with generic sysfs driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | */ |
| 385 | if (acpi_memory_disable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 386 | printk(KERN_ERR PREFIX |
| 387 | "Disable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /* |
| 389 | * TBD: Invoke acpi_bus_remove to cleanup data structures |
| 390 | */ |
| 391 | break; |
| 392 | default: |
| 393 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 394 | "Unsupported event [0x%x]\n", event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | break; |
| 396 | } |
| 397 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 398 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
| 400 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 401 | static int acpi_memory_device_add(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
| 403 | int result; |
| 404 | struct acpi_memory_device *mem_device = NULL; |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 408 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Burman Yan | 36bcbec | 2006-12-19 12:56:11 -0800 | [diff] [blame] | 410 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (!mem_device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 412 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 414 | INIT_LIST_HEAD(&mem_device->res_list); |
Patrick Mochel | 3b74863 | 2006-05-19 16:54:38 -0400 | [diff] [blame] | 415 | mem_device->device = device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
| 417 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); |
Pavel Machek | db89b4f | 2008-09-22 14:37:34 -0700 | [diff] [blame] | 418 | device->driver_data = mem_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
| 420 | /* Get the range from the _CRS */ |
| 421 | result = acpi_memory_get_device_resources(mem_device); |
| 422 | if (result) { |
| 423 | kfree(mem_device); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 424 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | /* Set the device state */ |
| 428 | mem_device->state = MEMORY_POWER_ON_STATE; |
| 429 | |
Yasunori Goto | 6cbe44c | 2006-10-19 23:28:30 -0700 | [diff] [blame] | 430 | printk(KERN_DEBUG "%s \n", acpi_device_name(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Bjorn Helgaas | 80f20fe | 2009-06-22 20:41:25 +0000 | [diff] [blame] | 432 | /* |
| 433 | * Early boot code has recognized memory area by EFI/E820. |
| 434 | * If DSDT shows these memory devices on boot, hotplug is not necessary |
| 435 | * for them. So, it just returns until completion of this driver's |
| 436 | * start up. |
| 437 | */ |
| 438 | if (!acpi_hotmem_initialized) |
| 439 | return 0; |
| 440 | |
| 441 | if (!acpi_memory_check_device(mem_device)) { |
| 442 | /* call add_memory func */ |
| 443 | result = acpi_memory_enable_device(mem_device); |
| 444 | if (result) |
| 445 | printk(KERN_ERR PREFIX |
| 446 | "Error in acpi_memory_enable_device\n"); |
| 447 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 448 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 451 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
| 453 | struct acpi_memory_device *mem_device = NULL; |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | if (!device || !acpi_driver_data(device)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 457 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 459 | mem_device = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | kfree(mem_device); |
| 461 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 462 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Helper function to check for memory device |
| 467 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 468 | static acpi_status is_memory_device(acpi_handle handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
| 470 | char *hardware_id; |
| 471 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct acpi_device_info *info; |
| 473 | |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 474 | status = acpi_get_object_info(handle, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 476 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | if (!(info->valid & ACPI_VALID_HID)) { |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 479 | kfree(info); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 480 | return AE_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 483 | hardware_id = info->hardware_id.string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if ((hardware_id == NULL) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 485 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | status = AE_ERROR; |
| 487 | |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 488 | kfree(info); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 489 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 493 | acpi_memory_register_notify_handler(acpi_handle handle, |
| 494 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
| 496 | acpi_status status; |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | status = is_memory_device(handle); |
Yasunori Goto | 07dd485 | 2006-08-14 22:37:32 -0700 | [diff] [blame] | 500 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 501 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 503 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| 504 | acpi_memory_device_notify, NULL); |
| 505 | /* continue */ |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 506 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 510 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
| 511 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
| 513 | acpi_status status; |
| 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | status = is_memory_device(handle); |
Yasunori Goto | 07dd485 | 2006-08-14 22:37:32 -0700 | [diff] [blame] | 517 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 518 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | status = acpi_remove_notify_handler(handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 521 | ACPI_SYSTEM_NOTIFY, |
| 522 | acpi_memory_device_notify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 524 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
| 526 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 527 | static int __init acpi_memory_device_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
| 529 | int result; |
| 530 | acpi_status status; |
| 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | result = acpi_bus_register_driver(&acpi_memory_device_driver); |
| 534 | |
| 535 | if (result < 0) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 536 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 539 | ACPI_UINT32_MAX, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 540 | acpi_memory_register_notify_handler, NULL, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 541 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 543 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 544 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 546 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 547 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Yasunori Goto | 887b959 | 2006-10-19 23:28:31 -0700 | [diff] [blame] | 549 | acpi_hotmem_initialized = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 550 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 553 | static void __exit acpi_memory_device_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | { |
| 555 | acpi_status status; |
| 556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* |
| 559 | * Adding this to un-install notification handlers for all the device |
| 560 | * handles. |
| 561 | */ |
| 562 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 563 | ACPI_UINT32_MAX, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 564 | acpi_memory_deregister_notify_handler, NULL, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 565 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 567 | if (ACPI_FAILURE(status)) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 568 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 571 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 572 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | module_init(acpi_memory_device_init); |
| 576 | module_exit(acpi_memory_device_exit); |