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 |
| 23 | * This driver fields notifications from firmare for memory add |
| 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_COMPONENT 0x08000000UL |
| 36 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
| 37 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
| 39 | |
| 40 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT |
| 41 | |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 42 | ACPI_MODULE_NAME("acpi_memhotplug"); |
| 43 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); |
Len Brown | 7cda93e | 2007-02-12 23:50:02 -0500 | [diff] [blame] | 44 | MODULE_DESCRIPTION("Hotplug Mem Driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | MODULE_LICENSE("GPL"); |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | /* Memory Device States */ |
| 48 | #define MEMORY_INVALID_STATE 0 |
| 49 | #define MEMORY_POWER_ON_STATE 1 |
| 50 | #define MEMORY_POWER_OFF_STATE 2 |
| 51 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | static int acpi_memory_device_add(struct acpi_device *device); |
| 53 | static int acpi_memory_device_remove(struct acpi_device *device, int type); |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 54 | static int acpi_memory_device_start(struct acpi_device *device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 56 | static const struct acpi_device_id memory_device_ids[] = { |
| 57 | {ACPI_MEMORY_DEVICE_HID, 0}, |
| 58 | {"", 0}, |
| 59 | }; |
| 60 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static struct acpi_driver acpi_memory_device_driver = { |
Len Brown | c2b6705 | 2007-02-12 23:33:40 -0500 | [diff] [blame] | 63 | .name = "acpi_memhotplug", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 64 | .class = ACPI_MEMORY_DEVICE_CLASS, |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 65 | .ids = memory_device_ids, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 66 | .ops = { |
| 67 | .add = acpi_memory_device_add, |
| 68 | .remove = acpi_memory_device_remove, |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 69 | .start = acpi_memory_device_start, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 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; |
| 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | if (!acpi_bus_get_device(handle, &device) && device) |
| 160 | goto end; |
| 161 | |
| 162 | status = acpi_get_parent(handle, &phandle); |
| 163 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 164 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 165 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /* Get the parent device */ |
| 169 | status = acpi_bus_get_device(phandle, &pdevice); |
| 170 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 171 | ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 172 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | /* |
| 176 | * Now add the notified device. This creates the acpi_device |
| 177 | * and invokes .add function |
| 178 | */ |
| 179 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
| 180 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 181 | ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 182 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 185 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | *mem_device = acpi_driver_data(device); |
| 187 | if (!(*mem_device)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 188 | printk(KERN_ERR "\n driver data not found"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 189 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 192 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 195 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
| 197 | unsigned long current_status; |
| 198 | |
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 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 243 | |
| 244 | if (node < 0) |
| 245 | node = memory_add_physaddr_to_nid(info->start_addr); |
| 246 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 247 | result = add_memory(node, info->start_addr, info->length); |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 248 | if (result) |
| 249 | continue; |
| 250 | info->enabled = 1; |
| 251 | num_enabled++; |
| 252 | } |
| 253 | if (!num_enabled) { |
akpm@osdl.org | 0a1f1ab | 2006-06-30 03:15:00 -0400 | [diff] [blame] | 254 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | mem_device->state = MEMORY_INVALID_STATE; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 256 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | return result; |
| 260 | } |
| 261 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 262 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 265 | struct acpi_object_list arg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | union acpi_object arg; |
| 267 | unsigned long current_status; |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | /* Issue the _EJ0 command */ |
| 271 | arg_list.count = 1; |
| 272 | arg_list.pointer = &arg; |
| 273 | arg.type = ACPI_TYPE_INTEGER; |
| 274 | arg.integer.value = 1; |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 275 | status = acpi_evaluate_object(mem_device->device->handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 276 | "_EJ0", &arg_list, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* Return on _EJ0 failure */ |
| 278 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 279 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 280 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | /* Evalute _STA to check if the device is disabled */ |
Patrick Mochel | b863278 | 2006-05-19 16:54:41 -0400 | [diff] [blame] | 284 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 285 | NULL, ¤t_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 287 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | /* Check for device status. Device should be disabled */ |
Bjorn Helgaas | a0bd4ac | 2007-04-25 14:17:39 -0400 | [diff] [blame] | 290 | if (current_status & ACPI_STA_DEVICE_ENABLED) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 291 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 293 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 296 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
| 298 | int result; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 299 | struct acpi_memory_info *info, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | /* |
| 303 | * Ask the VM to offline this memory range. |
| 304 | * Note: Assume that this function returns zero on success |
| 305 | */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 306 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
| 307 | if (info->enabled) { |
| 308 | result = remove_memory(info->start_addr, info->length); |
| 309 | if (result) |
| 310 | return result; |
| 311 | } |
| 312 | kfree(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | /* Power-off and eject the device */ |
| 316 | result = acpi_memory_powerdown_device(mem_device); |
| 317 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | /* Set the status of the device to invalid */ |
| 319 | mem_device->state = MEMORY_INVALID_STATE; |
| 320 | return result; |
| 321 | } |
| 322 | |
| 323 | mem_device->state = MEMORY_POWER_OFF_STATE; |
| 324 | return result; |
| 325 | } |
| 326 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 327 | 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] | 328 | { |
| 329 | struct acpi_memory_device *mem_device; |
| 330 | struct acpi_device *device; |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
| 333 | switch (event) { |
| 334 | case ACPI_NOTIFY_BUS_CHECK: |
| 335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 336 | "\nReceived BUS CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | /* Fall Through */ |
| 338 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 339 | if (event == ACPI_NOTIFY_DEVICE_CHECK) |
| 340 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 341 | "\nReceived DEVICE CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (acpi_memory_get_device(handle, &mem_device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 343 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 344 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | if (!acpi_memory_check_device(mem_device)) { |
| 348 | if (acpi_memory_enable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 349 | printk(KERN_ERR PREFIX |
| 350 | "Cannot enable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | break; |
| 353 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 354 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 355 | "\nReceived EJECT REQUEST notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | if (acpi_bus_get_device(handle, &device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 358 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | break; |
| 360 | } |
| 361 | mem_device = acpi_driver_data(device); |
| 362 | if (!mem_device) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 363 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | break; |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Currently disabling memory device from kernel mode |
| 369 | * TBD: Can also be disabled from user mode scripts |
| 370 | * TBD: Can also be disabled by Callback registration |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 371 | * with generic sysfs driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | */ |
| 373 | if (acpi_memory_disable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 374 | printk(KERN_ERR PREFIX |
| 375 | "Disable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /* |
| 377 | * TBD: Invoke acpi_bus_remove to cleanup data structures |
| 378 | */ |
| 379 | break; |
| 380 | default: |
| 381 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 382 | "Unsupported event [0x%x]\n", event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | break; |
| 384 | } |
| 385 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 386 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 389 | static int acpi_memory_device_add(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
| 391 | int result; |
| 392 | struct acpi_memory_device *mem_device = NULL; |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 396 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Burman Yan | 36bcbec | 2006-12-19 12:56:11 -0800 | [diff] [blame] | 398 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | if (!mem_device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 400 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 402 | INIT_LIST_HEAD(&mem_device->res_list); |
Patrick Mochel | 3b74863 | 2006-05-19 16:54:38 -0400 | [diff] [blame] | 403 | mem_device->device = device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
| 405 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); |
| 406 | acpi_driver_data(device) = mem_device; |
| 407 | |
| 408 | /* Get the range from the _CRS */ |
| 409 | result = acpi_memory_get_device_resources(mem_device); |
| 410 | if (result) { |
| 411 | kfree(mem_device); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 412 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* Set the device state */ |
| 416 | mem_device->state = MEMORY_POWER_ON_STATE; |
| 417 | |
Yasunori Goto | 6cbe44c | 2006-10-19 23:28:30 -0700 | [diff] [blame] | 418 | printk(KERN_DEBUG "%s \n", acpi_device_name(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 420 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 423 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
| 425 | struct acpi_memory_device *mem_device = NULL; |
| 426 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | if (!device || !acpi_driver_data(device)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 429 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 431 | mem_device = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | kfree(mem_device); |
| 433 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 434 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 437 | static int acpi_memory_device_start (struct acpi_device *device) |
| 438 | { |
| 439 | struct acpi_memory_device *mem_device; |
| 440 | int result = 0; |
| 441 | |
Yasunori Goto | 887b959 | 2006-10-19 23:28:31 -0700 | [diff] [blame] | 442 | /* |
| 443 | * Early boot code has recognized memory area by EFI/E820. |
| 444 | * If DSDT shows these memory devices on boot, hotplug is not necessary |
| 445 | * for them. So, it just returns until completion of this driver's |
| 446 | * start up. |
| 447 | */ |
| 448 | if (!acpi_hotmem_initialized) |
| 449 | return 0; |
| 450 | |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 451 | mem_device = acpi_driver_data(device); |
| 452 | |
| 453 | if (!acpi_memory_check_device(mem_device)) { |
| 454 | /* call add_memory func */ |
| 455 | result = acpi_memory_enable_device(mem_device); |
| 456 | if (result) |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame^] | 457 | printk(KERN_ERR PREFIX |
| 458 | "Error in acpi_memory_enable_device\n"); |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 459 | } |
Len Brown | d120cfb | 2006-06-29 19:57:46 -0400 | [diff] [blame] | 460 | return result; |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /* |
| 464 | * Helper function to check for memory device |
| 465 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 466 | static acpi_status is_memory_device(acpi_handle handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | { |
| 468 | char *hardware_id; |
| 469 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 470 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | struct acpi_device_info *info; |
| 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | status = acpi_get_object_info(handle, &buffer); |
| 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 | |
| 478 | info = buffer.pointer; |
| 479 | if (!(info->valid & ACPI_VALID_HID)) { |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 480 | kfree(buffer.pointer); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 481 | return AE_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | } |
| 483 | |
| 484 | hardware_id = info->hardware_id.value; |
| 485 | if ((hardware_id == NULL) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 486 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | status = AE_ERROR; |
| 488 | |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 489 | kfree(buffer.pointer); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 490 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 494 | acpi_memory_register_notify_handler(acpi_handle handle, |
| 495 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
| 497 | acpi_status status; |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | status = is_memory_device(handle); |
Yasunori Goto | 07dd485 | 2006-08-14 22:37:32 -0700 | [diff] [blame] | 501 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 502 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 504 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| 505 | acpi_memory_device_notify, NULL); |
| 506 | /* continue */ |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 507 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 511 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
| 512 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | { |
| 514 | acpi_status status; |
| 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
| 517 | status = is_memory_device(handle); |
Yasunori Goto | 07dd485 | 2006-08-14 22:37:32 -0700 | [diff] [blame] | 518 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 519 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | status = acpi_remove_notify_handler(handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 522 | ACPI_SYSTEM_NOTIFY, |
| 523 | acpi_memory_device_notify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 525 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 528 | static int __init acpi_memory_device_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | { |
| 530 | int result; |
| 531 | acpi_status status; |
| 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | result = acpi_bus_register_driver(&acpi_memory_device_driver); |
| 535 | |
| 536 | if (result < 0) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 537 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 540 | ACPI_UINT32_MAX, |
| 541 | acpi_memory_register_notify_handler, |
| 542 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 544 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 545 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 547 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 548 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Yasunori Goto | 887b959 | 2006-10-19 23:28:31 -0700 | [diff] [blame] | 550 | acpi_hotmem_initialized = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
| 553 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 554 | static void __exit acpi_memory_device_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
| 556 | acpi_status status; |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
| 559 | /* |
| 560 | * Adding this to un-install notification handlers for all the device |
| 561 | * handles. |
| 562 | */ |
| 563 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 564 | ACPI_UINT32_MAX, |
| 565 | acpi_memory_deregister_notify_handler, |
| 566 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 568 | if (ACPI_FAILURE(status)) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 569 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 572 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 573 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | module_init(acpi_memory_device_init); |
| 577 | module_exit(acpi_memory_device_exit); |