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1da177e4 LT |
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 | |
c7060d9e | 23 | * This driver fields notifications from firmware for memory add |
1da177e4 LT |
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 | ||
1da177e4 LT |
35 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
36 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" | |
1da177e4 LT |
37 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
38 | ||
39 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT | |
40 | ||
aa7b2b2e ZY |
41 | #undef PREFIX |
42 | #define PREFIX "ACPI:memory_hp:" | |
43 | ||
f52fd66d LB |
44 | ACPI_MODULE_NAME("acpi_memhotplug"); |
45 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); | |
7cda93e0 | 46 | MODULE_DESCRIPTION("Hotplug Mem Driver"); |
1da177e4 LT |
47 | MODULE_LICENSE("GPL"); |
48 | ||
1da177e4 LT |
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 | ||
4be44fcd LB |
54 | static int acpi_memory_device_add(struct acpi_device *device); |
55 | static int acpi_memory_device_remove(struct acpi_device *device, int type); | |
1f425994 | 56 | static int acpi_memory_device_start(struct acpi_device *device); |
1da177e4 | 57 | |
1ba90e3a TR |
58 | static const struct acpi_device_id memory_device_ids[] = { |
59 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
60 | {"", 0}, | |
61 | }; | |
62 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
63 | ||
1da177e4 | 64 | static struct acpi_driver acpi_memory_device_driver = { |
c2b6705b | 65 | .name = "acpi_memhotplug", |
4be44fcd | 66 | .class = ACPI_MEMORY_DEVICE_CLASS, |
1ba90e3a | 67 | .ids = memory_device_ids, |
4be44fcd LB |
68 | .ops = { |
69 | .add = acpi_memory_device_add, | |
70 | .remove = acpi_memory_device_remove, | |
1f425994 | 71 | .start = acpi_memory_device_start, |
4be44fcd | 72 | }, |
1da177e4 LT |
73 | }; |
74 | ||
9ac02398 KH |
75 | struct acpi_memory_info { |
76 | struct list_head list; | |
77 | u64 start_addr; /* Memory Range start physical addr */ | |
78 | u64 length; /* Memory Range length */ | |
79 | unsigned short caching; /* memory cache attribute */ | |
80 | unsigned short write_protect; /* memory read/write attribute */ | |
81 | unsigned int enabled:1; | |
82 | }; | |
83 | ||
1da177e4 | 84 | struct acpi_memory_device { |
3b74863d | 85 | struct acpi_device * device; |
4be44fcd | 86 | unsigned int state; /* State of the memory device */ |
9ac02398 | 87 | struct list_head res_list; |
1da177e4 LT |
88 | }; |
89 | ||
887b9593 YG |
90 | static int acpi_hotmem_initialized; |
91 | ||
9ac02398 KH |
92 | static acpi_status |
93 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
94 | { | |
95 | struct acpi_memory_device *mem_device = context; | |
96 | struct acpi_resource_address64 address64; | |
97 | struct acpi_memory_info *info, *new; | |
98 | acpi_status status; | |
99 | ||
100 | status = acpi_resource_to_address64(resource, &address64); | |
101 | if (ACPI_FAILURE(status) || | |
102 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
103 | return AE_OK; | |
104 | ||
105 | list_for_each_entry(info, &mem_device->res_list, list) { | |
106 | /* Can we combine the resource range information? */ | |
107 | if ((info->caching == address64.info.mem.caching) && | |
108 | (info->write_protect == address64.info.mem.write_protect) && | |
109 | (info->start_addr + info->length == address64.minimum)) { | |
110 | info->length += address64.address_length; | |
111 | return AE_OK; | |
112 | } | |
113 | } | |
114 | ||
115 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
116 | if (!new) | |
117 | return AE_ERROR; | |
118 | ||
119 | INIT_LIST_HEAD(&new->list); | |
120 | new->caching = address64.info.mem.caching; | |
121 | new->write_protect = address64.info.mem.write_protect; | |
122 | new->start_addr = address64.minimum; | |
123 | new->length = address64.address_length; | |
124 | list_add_tail(&new->list, &mem_device->res_list); | |
125 | ||
126 | return AE_OK; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | static int |
130 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
131 | { | |
132 | acpi_status status; | |
9ac02398 | 133 | struct acpi_memory_info *info, *n; |
1da177e4 | 134 | |
1da177e4 | 135 | |
5d2870fa KH |
136 | if (!list_empty(&mem_device->res_list)) |
137 | return 0; | |
138 | ||
b8632785 | 139 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
9ac02398 KH |
140 | acpi_memory_get_resource, mem_device); |
141 | if (ACPI_FAILURE(status)) { | |
142 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
143 | kfree(info); | |
5d2870fa | 144 | INIT_LIST_HEAD(&mem_device->res_list); |
d550d98d | 145 | return -EINVAL; |
1da177e4 LT |
146 | } |
147 | ||
d550d98d | 148 | return 0; |
1da177e4 LT |
149 | } |
150 | ||
151 | static int | |
152 | acpi_memory_get_device(acpi_handle handle, | |
4be44fcd | 153 | struct acpi_memory_device **mem_device) |
1da177e4 LT |
154 | { |
155 | acpi_status status; | |
156 | acpi_handle phandle; | |
157 | struct acpi_device *device = NULL; | |
158 | struct acpi_device *pdevice = NULL; | |
aa7b2b2e | 159 | int result; |
1da177e4 | 160 | |
1da177e4 LT |
161 | |
162 | if (!acpi_bus_get_device(handle, &device) && device) | |
163 | goto end; | |
164 | ||
165 | status = acpi_get_parent(handle, &phandle); | |
166 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 167 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
d550d98d | 168 | return -EINVAL; |
1da177e4 LT |
169 | } |
170 | ||
171 | /* Get the parent device */ | |
aa7b2b2e ZY |
172 | result = acpi_bus_get_device(phandle, &pdevice); |
173 | if (result) { | |
174 | printk(KERN_WARNING PREFIX "Cannot get acpi bus device"); | |
d550d98d | 175 | return -EINVAL; |
1da177e4 LT |
176 | } |
177 | ||
178 | /* | |
179 | * Now add the notified device. This creates the acpi_device | |
180 | * and invokes .add function | |
181 | */ | |
aa7b2b2e ZY |
182 | result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
183 | if (result) { | |
184 | printk(KERN_WARNING PREFIX "Cannot add acpi bus"); | |
d550d98d | 185 | return -EINVAL; |
1da177e4 LT |
186 | } |
187 | ||
4be44fcd | 188 | end: |
1da177e4 LT |
189 | *mem_device = acpi_driver_data(device); |
190 | if (!(*mem_device)) { | |
4be44fcd | 191 | printk(KERN_ERR "\n driver data not found"); |
d550d98d | 192 | return -ENODEV; |
1da177e4 LT |
193 | } |
194 | ||
d550d98d | 195 | return 0; |
1da177e4 LT |
196 | } |
197 | ||
4be44fcd | 198 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 | 199 | { |
27663c58 | 200 | unsigned long long current_status; |
1da177e4 LT |
201 | |
202 | /* Get device present/absent information from the _STA */ | |
b8632785 | 203 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 204 | NULL, ¤t_status))) |
d550d98d | 205 | return -ENODEV; |
1da177e4 LT |
206 | /* |
207 | * Check for device status. Device should be | |
208 | * present/enabled/functioning. | |
209 | */ | |
a0bd4ac4 BH |
210 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) |
211 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
212 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
d550d98d | 213 | return -ENODEV; |
1da177e4 | 214 | |
d550d98d | 215 | return 0; |
1da177e4 LT |
216 | } |
217 | ||
4be44fcd | 218 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
1da177e4 | 219 | { |
9ac02398 KH |
220 | int result, num_enabled = 0; |
221 | struct acpi_memory_info *info; | |
1e3590e2 | 222 | int node; |
1da177e4 | 223 | |
1da177e4 LT |
224 | |
225 | /* Get the range from the _CRS */ | |
226 | result = acpi_memory_get_device_resources(mem_device); | |
227 | if (result) { | |
6468463a | 228 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
1da177e4 LT |
229 | mem_device->state = MEMORY_INVALID_STATE; |
230 | return result; | |
231 | } | |
232 | ||
b8632785 | 233 | node = acpi_get_node(mem_device->device->handle); |
1da177e4 LT |
234 | /* |
235 | * Tell the VM there is more memory here... | |
236 | * Note: Assume that this function returns zero on success | |
9ac02398 KH |
237 | * We don't have memory-hot-add rollback function,now. |
238 | * (i.e. memory-hot-remove function) | |
1da177e4 | 239 | */ |
9ac02398 | 240 | list_for_each_entry(info, &mem_device->res_list, list) { |
fa25d8d6 | 241 | if (info->enabled) { /* just sanity check...*/ |
dd56a8e3 YG |
242 | num_enabled++; |
243 | continue; | |
244 | } | |
8c2676a5 KM |
245 | |
246 | if (node < 0) | |
247 | node = memory_add_physaddr_to_nid(info->start_addr); | |
248 | ||
bc02af93 | 249 | result = add_memory(node, info->start_addr, info->length); |
9ac02398 KH |
250 | if (result) |
251 | continue; | |
252 | info->enabled = 1; | |
253 | num_enabled++; | |
254 | } | |
255 | if (!num_enabled) { | |
0a1f1ab8 | 256 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
1da177e4 | 257 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 258 | return -EINVAL; |
1da177e4 LT |
259 | } |
260 | ||
261 | return result; | |
262 | } | |
263 | ||
4be44fcd | 264 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
265 | { |
266 | acpi_status status; | |
4be44fcd | 267 | struct acpi_object_list arg_list; |
1da177e4 | 268 | union acpi_object arg; |
27663c58 | 269 | unsigned long long current_status; |
1da177e4 | 270 | |
1da177e4 LT |
271 | |
272 | /* Issue the _EJ0 command */ | |
273 | arg_list.count = 1; | |
274 | arg_list.pointer = &arg; | |
275 | arg.type = ACPI_TYPE_INTEGER; | |
276 | arg.integer.value = 1; | |
b8632785 | 277 | status = acpi_evaluate_object(mem_device->device->handle, |
4be44fcd | 278 | "_EJ0", &arg_list, NULL); |
1da177e4 LT |
279 | /* Return on _EJ0 failure */ |
280 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 281 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
d550d98d | 282 | return -ENODEV; |
1da177e4 LT |
283 | } |
284 | ||
285 | /* Evalute _STA to check if the device is disabled */ | |
b8632785 | 286 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 287 | NULL, ¤t_status); |
1da177e4 | 288 | if (ACPI_FAILURE(status)) |
d550d98d | 289 | return -ENODEV; |
1da177e4 LT |
290 | |
291 | /* Check for device status. Device should be disabled */ | |
a0bd4ac4 | 292 | if (current_status & ACPI_STA_DEVICE_ENABLED) |
d550d98d | 293 | return -EINVAL; |
1da177e4 | 294 | |
d550d98d | 295 | return 0; |
1da177e4 LT |
296 | } |
297 | ||
4be44fcd | 298 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
299 | { |
300 | int result; | |
9ac02398 | 301 | struct acpi_memory_info *info, *n; |
1da177e4 | 302 | |
1da177e4 LT |
303 | |
304 | /* | |
305 | * Ask the VM to offline this memory range. | |
306 | * Note: Assume that this function returns zero on success | |
307 | */ | |
9ac02398 KH |
308 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
309 | if (info->enabled) { | |
310 | result = remove_memory(info->start_addr, info->length); | |
311 | if (result) | |
312 | return result; | |
313 | } | |
314 | kfree(info); | |
1da177e4 LT |
315 | } |
316 | ||
317 | /* Power-off and eject the device */ | |
318 | result = acpi_memory_powerdown_device(mem_device); | |
319 | if (result) { | |
1da177e4 LT |
320 | /* Set the status of the device to invalid */ |
321 | mem_device->state = MEMORY_INVALID_STATE; | |
322 | return result; | |
323 | } | |
324 | ||
325 | mem_device->state = MEMORY_POWER_OFF_STATE; | |
326 | return result; | |
327 | } | |
328 | ||
4be44fcd | 329 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 LT |
330 | { |
331 | struct acpi_memory_device *mem_device; | |
332 | struct acpi_device *device; | |
333 | ||
1da177e4 LT |
334 | |
335 | switch (event) { | |
336 | case ACPI_NOTIFY_BUS_CHECK: | |
337 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 338 | "\nReceived BUS CHECK notification for device\n")); |
1da177e4 LT |
339 | /* Fall Through */ |
340 | case ACPI_NOTIFY_DEVICE_CHECK: | |
341 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
342 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 343 | "\nReceived DEVICE CHECK notification for device\n")); |
1da177e4 | 344 | if (acpi_memory_get_device(handle, &mem_device)) { |
6468463a | 345 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
d550d98d | 346 | return; |
1da177e4 LT |
347 | } |
348 | ||
349 | if (!acpi_memory_check_device(mem_device)) { | |
350 | if (acpi_memory_enable_device(mem_device)) | |
6468463a LB |
351 | printk(KERN_ERR PREFIX |
352 | "Cannot enable memory device\n"); | |
1da177e4 LT |
353 | } |
354 | break; | |
355 | case ACPI_NOTIFY_EJECT_REQUEST: | |
356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 357 | "\nReceived EJECT REQUEST notification for device\n")); |
1da177e4 LT |
358 | |
359 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a | 360 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
1da177e4 LT |
361 | break; |
362 | } | |
363 | mem_device = acpi_driver_data(device); | |
364 | if (!mem_device) { | |
6468463a | 365 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
1da177e4 LT |
366 | break; |
367 | } | |
368 | ||
369 | /* | |
370 | * Currently disabling memory device from kernel mode | |
371 | * TBD: Can also be disabled from user mode scripts | |
372 | * TBD: Can also be disabled by Callback registration | |
4be44fcd | 373 | * with generic sysfs driver |
1da177e4 LT |
374 | */ |
375 | if (acpi_memory_disable_device(mem_device)) | |
6468463a LB |
376 | printk(KERN_ERR PREFIX |
377 | "Disable memory device\n"); | |
1da177e4 LT |
378 | /* |
379 | * TBD: Invoke acpi_bus_remove to cleanup data structures | |
380 | */ | |
381 | break; | |
382 | default: | |
383 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 384 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
385 | break; |
386 | } | |
387 | ||
d550d98d | 388 | return; |
1da177e4 LT |
389 | } |
390 | ||
4be44fcd | 391 | static int acpi_memory_device_add(struct acpi_device *device) |
1da177e4 LT |
392 | { |
393 | int result; | |
394 | struct acpi_memory_device *mem_device = NULL; | |
395 | ||
1da177e4 LT |
396 | |
397 | if (!device) | |
d550d98d | 398 | return -EINVAL; |
1da177e4 | 399 | |
36bcbec7 | 400 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
1da177e4 | 401 | if (!mem_device) |
d550d98d | 402 | return -ENOMEM; |
1da177e4 | 403 | |
9ac02398 | 404 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 405 | mem_device->device = device; |
1da177e4 LT |
406 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
407 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
db89b4f0 | 408 | device->driver_data = mem_device; |
1da177e4 LT |
409 | |
410 | /* Get the range from the _CRS */ | |
411 | result = acpi_memory_get_device_resources(mem_device); | |
412 | if (result) { | |
413 | kfree(mem_device); | |
d550d98d | 414 | return result; |
1da177e4 LT |
415 | } |
416 | ||
417 | /* Set the device state */ | |
418 | mem_device->state = MEMORY_POWER_ON_STATE; | |
419 | ||
6cbe44cd | 420 | printk(KERN_DEBUG "%s \n", acpi_device_name(device)); |
1da177e4 | 421 | |
d550d98d | 422 | return result; |
1da177e4 LT |
423 | } |
424 | ||
4be44fcd | 425 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
1da177e4 LT |
426 | { |
427 | struct acpi_memory_device *mem_device = NULL; | |
428 | ||
1da177e4 LT |
429 | |
430 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 431 | return -EINVAL; |
1da177e4 | 432 | |
50dd0969 | 433 | mem_device = acpi_driver_data(device); |
1da177e4 LT |
434 | kfree(mem_device); |
435 | ||
d550d98d | 436 | return 0; |
1da177e4 LT |
437 | } |
438 | ||
1f425994 YG |
439 | static int acpi_memory_device_start (struct acpi_device *device) |
440 | { | |
441 | struct acpi_memory_device *mem_device; | |
442 | int result = 0; | |
443 | ||
887b9593 YG |
444 | /* |
445 | * Early boot code has recognized memory area by EFI/E820. | |
446 | * If DSDT shows these memory devices on boot, hotplug is not necessary | |
447 | * for them. So, it just returns until completion of this driver's | |
448 | * start up. | |
449 | */ | |
450 | if (!acpi_hotmem_initialized) | |
451 | return 0; | |
452 | ||
1f425994 YG |
453 | mem_device = acpi_driver_data(device); |
454 | ||
455 | if (!acpi_memory_check_device(mem_device)) { | |
456 | /* call add_memory func */ | |
457 | result = acpi_memory_enable_device(mem_device); | |
458 | if (result) | |
55ac9a01 LM |
459 | printk(KERN_ERR PREFIX |
460 | "Error in acpi_memory_enable_device\n"); | |
1f425994 | 461 | } |
d120cfb5 | 462 | return result; |
1f425994 YG |
463 | } |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Helper function to check for memory device | |
467 | */ | |
4be44fcd | 468 | static acpi_status is_memory_device(acpi_handle handle) |
1da177e4 LT |
469 | { |
470 | char *hardware_id; | |
471 | acpi_status status; | |
4be44fcd | 472 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 LT |
473 | struct acpi_device_info *info; |
474 | ||
1da177e4 LT |
475 | |
476 | status = acpi_get_object_info(handle, &buffer); | |
477 | if (ACPI_FAILURE(status)) | |
d550d98d | 478 | return status; |
1da177e4 LT |
479 | |
480 | info = buffer.pointer; | |
481 | if (!(info->valid & ACPI_VALID_HID)) { | |
02438d87 | 482 | kfree(buffer.pointer); |
d550d98d | 483 | return AE_ERROR; |
1da177e4 LT |
484 | } |
485 | ||
486 | hardware_id = info->hardware_id.value; | |
487 | if ((hardware_id == NULL) || | |
4be44fcd | 488 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
1da177e4 LT |
489 | status = AE_ERROR; |
490 | ||
02438d87 | 491 | kfree(buffer.pointer); |
d550d98d | 492 | return status; |
1da177e4 LT |
493 | } |
494 | ||
495 | static acpi_status | |
4be44fcd LB |
496 | acpi_memory_register_notify_handler(acpi_handle handle, |
497 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
498 | { |
499 | acpi_status status; | |
500 | ||
1da177e4 LT |
501 | |
502 | status = is_memory_device(handle); | |
07dd4855 | 503 | if (ACPI_FAILURE(status)) |
d550d98d | 504 | return AE_OK; /* continue */ |
1da177e4 LT |
505 | |
506 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
4be44fcd | 507 | acpi_memory_device_notify, NULL); |
a6fc6720 | 508 | /* continue */ |
d550d98d | 509 | return AE_OK; |
1da177e4 LT |
510 | } |
511 | ||
512 | static acpi_status | |
4be44fcd LB |
513 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
514 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
515 | { |
516 | acpi_status status; | |
517 | ||
1da177e4 LT |
518 | |
519 | status = is_memory_device(handle); | |
07dd4855 | 520 | if (ACPI_FAILURE(status)) |
d550d98d | 521 | return AE_OK; /* continue */ |
1da177e4 LT |
522 | |
523 | status = acpi_remove_notify_handler(handle, | |
4be44fcd LB |
524 | ACPI_SYSTEM_NOTIFY, |
525 | acpi_memory_device_notify); | |
1da177e4 | 526 | |
d550d98d | 527 | return AE_OK; /* continue */ |
1da177e4 LT |
528 | } |
529 | ||
4be44fcd | 530 | static int __init acpi_memory_device_init(void) |
1da177e4 LT |
531 | { |
532 | int result; | |
533 | acpi_status status; | |
534 | ||
1da177e4 LT |
535 | |
536 | result = acpi_bus_register_driver(&acpi_memory_device_driver); | |
537 | ||
538 | if (result < 0) | |
d550d98d | 539 | return -ENODEV; |
1da177e4 LT |
540 | |
541 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
542 | ACPI_UINT32_MAX, |
543 | acpi_memory_register_notify_handler, | |
544 | NULL, NULL); | |
1da177e4 | 545 | |
4be44fcd | 546 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 547 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 | 548 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
d550d98d | 549 | return -ENODEV; |
4be44fcd | 550 | } |
1da177e4 | 551 | |
887b9593 | 552 | acpi_hotmem_initialized = 1; |
d550d98d | 553 | return 0; |
1da177e4 LT |
554 | } |
555 | ||
4be44fcd | 556 | static void __exit acpi_memory_device_exit(void) |
1da177e4 LT |
557 | { |
558 | acpi_status status; | |
559 | ||
1da177e4 LT |
560 | |
561 | /* | |
562 | * Adding this to un-install notification handlers for all the device | |
563 | * handles. | |
564 | */ | |
565 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
566 | ACPI_UINT32_MAX, |
567 | acpi_memory_deregister_notify_handler, | |
568 | NULL, NULL); | |
1da177e4 | 569 | |
4be44fcd | 570 | if (ACPI_FAILURE(status)) |
a6fc6720 | 571 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 LT |
572 | |
573 | acpi_bus_unregister_driver(&acpi_memory_device_driver); | |
574 | ||
d550d98d | 575 | return; |
1da177e4 LT |
576 | } |
577 | ||
578 | module_init(acpi_memory_device_init); | |
579 | module_exit(acpi_memory_device_exit); |