blob: d677130f9898bb07a5e47e8d72272b1298728c81 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Torvalds1da177e2005-04-16 15:20:36 -070035#define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL
36#define ACPI_MEMORY_DEVICE_CLASS "memory"
37#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
38#define ACPI_MEMORY_DEVICE_DRIVER_NAME "Hotplug Mem Driver"
39#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
40
41#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
42
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("acpi_memhotplug");
44MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070045MODULE_DESCRIPTION(ACPI_MEMORY_DEVICE_DRIVER_NAME);
46MODULE_LICENSE("GPL");
47
48/* ACPI _STA method values */
49#define ACPI_MEMORY_STA_PRESENT (0x00000001UL)
50#define ACPI_MEMORY_STA_ENABLED (0x00000002UL)
51#define ACPI_MEMORY_STA_FUNCTIONAL (0x00000008UL)
52
53/* Memory Device States */
54#define MEMORY_INVALID_STATE 0
55#define MEMORY_POWER_ON_STATE 1
56#define MEMORY_POWER_OFF_STATE 2
57
Len Brown4be44fc2005-08-05 00:44:28 -040058static int acpi_memory_device_add(struct acpi_device *device);
59static int acpi_memory_device_remove(struct acpi_device *device, int type);
Yasunori Goto1f425992006-06-27 02:53:28 -070060static int acpi_memory_device_start(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62static struct acpi_driver acpi_memory_device_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050063 .name = "acpi_memhotplug",
Len Brown4be44fc2005-08-05 00:44:28 -040064 .class = ACPI_MEMORY_DEVICE_CLASS,
65 .ids = ACPI_MEMORY_DEVICE_HID,
66 .ops = {
67 .add = acpi_memory_device_add,
68 .remove = acpi_memory_device_remove,
Yasunori Goto1f425992006-06-27 02:53:28 -070069 .start = acpi_memory_device_start,
Len Brown4be44fc2005-08-05 00:44:28 -040070 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070073struct 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 Torvalds1da177e2005-04-16 15:20:36 -070082struct acpi_memory_device {
Patrick Mochel3b748632006-05-19 16:54:38 -040083 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040084 unsigned int state; /* State of the memory device */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070085 struct list_head res_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086};
87
Yasunori Goto887b9592006-10-19 23:28:31 -070088static int acpi_hotmem_initialized;
89
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -070090static acpi_status
91acpi_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 Torvalds1da177e2005-04-16 15:20:36 -0700127static int
128acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
129{
130 acpi_status status;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700131 struct acpi_memory_info *info, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
KAMEZAWA Hiroyuki5d2870f2006-08-05 12:15:04 -0700134 if (!list_empty(&mem_device->res_list))
135 return 0;
136
Patrick Mochelb8632782006-05-19 16:54:41 -0400137 status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700138 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 Hiroyuki5d2870f2006-08-05 12:15:04 -0700142 INIT_LIST_HEAD(&mem_device->res_list);
Patrick Mocheld550d982006-06-27 00:41:40 -0400143 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145
Patrick Mocheld550d982006-06-27 00:41:40 -0400146 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149static int
150acpi_memory_get_device(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400151 struct acpi_memory_device **mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 acpi_status status;
154 acpi_handle phandle;
155 struct acpi_device *device = NULL;
156 struct acpi_device *pdevice = NULL;
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
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 Renningera6fc6722006-06-26 23:58:43 -0400164 ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400165 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
167
168 /* Get the parent device */
169 status = acpi_bus_get_device(phandle, &pdevice);
170 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400171 ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400172 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 }
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 Renningera6fc6722006-06-26 23:58:43 -0400181 ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400182 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184
Len Brown4be44fc2005-08-05 00:44:28 -0400185 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 *mem_device = acpi_driver_data(device);
187 if (!(*mem_device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400188 printk(KERN_ERR "\n driver data not found");
Patrick Mocheld550d982006-06-27 00:41:40 -0400189 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 }
191
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Len Brown4be44fc2005-08-05 00:44:28 -0400195static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 unsigned long current_status;
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 /* Get device present/absent information from the _STA */
Patrick Mochelb8632782006-05-19 16:54:41 -0400201 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
Len Brown4be44fc2005-08-05 00:44:28 -0400202 NULL, &current_status)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400203 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /*
205 * Check for device status. Device should be
206 * present/enabled/functioning.
207 */
208 if (!((current_status & ACPI_MEMORY_STA_PRESENT)
Len Brown4be44fc2005-08-05 00:44:28 -0400209 && (current_status & ACPI_MEMORY_STA_ENABLED)
210 && (current_status & ACPI_MEMORY_STA_FUNCTIONAL)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400211 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Patrick Mocheld550d982006-06-27 00:41:40 -0400213 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
Len Brown4be44fc2005-08-05 00:44:28 -0400216static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700218 int result, num_enabled = 0;
219 struct acpi_memory_info *info;
Yasunori Goto1e3590e2006-06-27 02:53:31 -0700220 int node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 /* Get the range from the _CRS */
224 result = acpi_memory_get_device_resources(mem_device);
225 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400226 printk(KERN_ERR PREFIX "get_device_resources failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 mem_device->state = MEMORY_INVALID_STATE;
228 return result;
229 }
230
Patrick Mochelb8632782006-05-19 16:54:41 -0400231 node = acpi_get_node(mem_device->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 /*
233 * Tell the VM there is more memory here...
234 * Note: Assume that this function returns zero on success
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700235 * We don't have memory-hot-add rollback function,now.
236 * (i.e. memory-hot-remove function)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700238 list_for_each_entry(info, &mem_device->res_list, list) {
KAMEZAWA Hiroyukifa25d8d2006-08-05 12:15:02 -0700239 if (info->enabled) { /* just sanity check...*/
Yasunori Gotodd56a8e2006-06-27 02:53:29 -0700240 num_enabled++;
241 continue;
242 }
Keith Mannthey8c2676a2006-09-30 23:27:07 -0700243
244 if (node < 0)
245 node = memory_add_physaddr_to_nid(info->start_addr);
246
Yasunori Gotobc02af92006-06-27 02:53:30 -0700247 result = add_memory(node, info->start_addr, info->length);
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700248 if (result)
249 continue;
250 info->enabled = 1;
251 num_enabled++;
252 }
253 if (!num_enabled) {
akpm@osdl.org0a1f1ab2006-06-30 03:15:00 -0400254 printk(KERN_ERR PREFIX "add_memory failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 mem_device->state = MEMORY_INVALID_STATE;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700256 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258
259 return result;
260}
261
Len Brown4be44fc2005-08-05 00:44:28 -0400262static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
264 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400265 struct acpi_object_list arg_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 union acpi_object arg;
267 unsigned long current_status;
268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
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 Mochelb8632782006-05-19 16:54:41 -0400275 status = acpi_evaluate_object(mem_device->device->handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400276 "_EJ0", &arg_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 /* Return on _EJ0 failure */
278 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400279 ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400280 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
282
283 /* Evalute _STA to check if the device is disabled */
Patrick Mochelb8632782006-05-19 16:54:41 -0400284 status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
Len Brown4be44fc2005-08-05 00:44:28 -0400285 NULL, &current_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400287 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 /* Check for device status. Device should be disabled */
290 if (current_status & ACPI_MEMORY_STA_ENABLED)
Patrick Mocheld550d982006-06-27 00:41:40 -0400291 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Len Brown4be44fc2005-08-05 00:44:28 -0400296static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
298 int result;
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700299 struct acpi_memory_info *info, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 /*
303 * Ask the VM to offline this memory range.
304 * Note: Assume that this function returns zero on success
305 */
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700306 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 Torvalds1da177e2005-04-16 15:20:36 -0700313 }
314
315 /* Power-off and eject the device */
316 result = acpi_memory_powerdown_device(mem_device);
317 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 /* 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 Brown4be44fc2005-08-05 00:44:28 -0400327static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 struct acpi_memory_device *mem_device;
330 struct acpi_device *device;
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 switch (event) {
334 case ACPI_NOTIFY_BUS_CHECK:
335 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400336 "\nReceived BUS CHECK notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 /* Fall Through */
338 case ACPI_NOTIFY_DEVICE_CHECK:
339 if (event == ACPI_NOTIFY_DEVICE_CHECK)
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400341 "\nReceived DEVICE CHECK notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (acpi_memory_get_device(handle, &mem_device)) {
Len Brown64684632006-06-26 23:41:38 -0400343 printk(KERN_ERR PREFIX "Cannot find driver data\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400344 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 }
346
347 if (!acpi_memory_check_device(mem_device)) {
348 if (acpi_memory_enable_device(mem_device))
Len Brown64684632006-06-26 23:41:38 -0400349 printk(KERN_ERR PREFIX
350 "Cannot enable memory device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352 break;
353 case ACPI_NOTIFY_EJECT_REQUEST:
354 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400355 "\nReceived EJECT REQUEST notification for device\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357 if (acpi_bus_get_device(handle, &device)) {
Len Brown64684632006-06-26 23:41:38 -0400358 printk(KERN_ERR PREFIX "Device doesn't exist\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 break;
360 }
361 mem_device = acpi_driver_data(device);
362 if (!mem_device) {
Len Brown64684632006-06-26 23:41:38 -0400363 printk(KERN_ERR PREFIX "Driver Data is NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 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 Brown4be44fc2005-08-05 00:44:28 -0400371 * with generic sysfs driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 */
373 if (acpi_memory_disable_device(mem_device))
Len Brown64684632006-06-26 23:41:38 -0400374 printk(KERN_ERR PREFIX
375 "Disable memory device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /*
377 * TBD: Invoke acpi_bus_remove to cleanup data structures
378 */
379 break;
380 default:
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400382 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 break;
384 }
385
Patrick Mocheld550d982006-06-27 00:41:40 -0400386 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387}
388
Len Brown4be44fc2005-08-05 00:44:28 -0400389static int acpi_memory_device_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390{
391 int result;
392 struct acpi_memory_device *mem_device = NULL;
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400396 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Burman Yan36bcbec2006-12-19 12:56:11 -0800398 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 if (!mem_device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400400 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
KAMEZAWA Hiroyuki9ac02392006-06-27 02:53:27 -0700402 INIT_LIST_HEAD(&mem_device->res_list);
Patrick Mochel3b748632006-05-19 16:54:38 -0400403 mem_device->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 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 Mocheld550d982006-06-27 00:41:40 -0400412 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
414
415 /* Set the device state */
416 mem_device->state = MEMORY_POWER_ON_STATE;
417
Yasunori Goto6cbe44c2006-10-19 23:28:30 -0700418 printk(KERN_DEBUG "%s \n", acpi_device_name(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Patrick Mocheld550d982006-06-27 00:41:40 -0400420 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
Len Brown4be44fc2005-08-05 00:44:28 -0400423static int acpi_memory_device_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
425 struct acpi_memory_device *mem_device = NULL;
426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400429 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200431 mem_device = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 kfree(mem_device);
433
Patrick Mocheld550d982006-06-27 00:41:40 -0400434 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
Yasunori Goto1f425992006-06-27 02:53:28 -0700437static int acpi_memory_device_start (struct acpi_device *device)
438{
439 struct acpi_memory_device *mem_device;
440 int result = 0;
441
Yasunori Goto887b9592006-10-19 23:28:31 -0700442 /*
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 Goto1f425992006-06-27 02:53:28 -0700451 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)
457 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
458 "Error in acpi_memory_enable_device\n"));
459 }
Len Brownd120cfb2006-06-29 19:57:46 -0400460 return result;
Yasunori Goto1f425992006-06-27 02:53:28 -0700461}
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463/*
464 * Helper function to check for memory device
465 */
Len Brown4be44fc2005-08-05 00:44:28 -0400466static acpi_status is_memory_device(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
468 char *hardware_id;
469 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400470 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 struct acpi_device_info *info;
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 status = acpi_get_object_info(handle, &buffer);
475 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400476 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 info = buffer.pointer;
479 if (!(info->valid & ACPI_VALID_HID)) {
Len Brown02438d82006-06-30 03:19:10 -0400480 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400481 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483
484 hardware_id = info->hardware_id.value;
485 if ((hardware_id == NULL) ||
Len Brown4be44fc2005-08-05 00:44:28 -0400486 (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 status = AE_ERROR;
488
Len Brown02438d82006-06-30 03:19:10 -0400489 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
493static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400494acpi_memory_register_notify_handler(acpi_handle handle,
495 u32 level, void *ctxt, void **retv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 acpi_status status;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 status = is_memory_device(handle);
Yasunori Goto07dd4852006-08-14 22:37:32 -0700501 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400502 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Thomas Renningera6fc6722006-06-26 23:58:43 -0400504 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
505 acpi_memory_device_notify, NULL);
506 /* continue */
Patrick Mocheld550d982006-06-27 00:41:40 -0400507 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
510static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400511acpi_memory_deregister_notify_handler(acpi_handle handle,
512 u32 level, void *ctxt, void **retv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 acpi_status status;
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 status = is_memory_device(handle);
Yasunori Goto07dd4852006-08-14 22:37:32 -0700518 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400519 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 status = acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400522 ACPI_SYSTEM_NOTIFY,
523 acpi_memory_device_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Patrick Mocheld550d982006-06-27 00:41:40 -0400525 return AE_OK; /* continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
Len Brown4be44fc2005-08-05 00:44:28 -0400528static int __init acpi_memory_device_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
530 int result;
531 acpi_status status;
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 result = acpi_bus_register_driver(&acpi_memory_device_driver);
535
536 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400537 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Len Brown4be44fc2005-08-05 00:44:28 -0400540 ACPI_UINT32_MAX,
541 acpi_memory_register_notify_handler,
542 NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Len Brown4be44fc2005-08-05 00:44:28 -0400544 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400545 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 acpi_bus_unregister_driver(&acpi_memory_device_driver);
Patrick Mocheld550d982006-06-27 00:41:40 -0400547 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Yasunori Goto887b9592006-10-19 23:28:31 -0700550 acpi_hotmem_initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400551 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552}
553
Len Brown4be44fc2005-08-05 00:44:28 -0400554static void __exit acpi_memory_device_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
556 acpi_status status;
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
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 Brown4be44fc2005-08-05 00:44:28 -0400564 ACPI_UINT32_MAX,
565 acpi_memory_deregister_notify_handler,
566 NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Len Brown4be44fc2005-08-05 00:44:28 -0400568 if (ACPI_FAILURE(status))
Thomas Renningera6fc6722006-06-26 23:58:43 -0400569 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 acpi_bus_unregister_driver(&acpi_memory_device_driver);
572
Patrick Mocheld550d982006-06-27 00:41:40 -0400573 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574}
575
576module_init(acpi_memory_device_init);
577module_exit(acpi_memory_device_exit);