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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> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
ab6c5709 | 34 | #include <linux/acpi.h> |
1da177e4 LT |
35 | #include <acpi/acpi_drivers.h> |
36 | ||
1da177e4 LT |
37 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
38 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" | |
1da177e4 LT |
39 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
40 | ||
41 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT | |
42 | ||
aa7b2b2e ZY |
43 | #undef PREFIX |
44 | #define PREFIX "ACPI:memory_hp:" | |
45 | ||
f52fd66d LB |
46 | ACPI_MODULE_NAME("acpi_memhotplug"); |
47 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); | |
7cda93e0 | 48 | MODULE_DESCRIPTION("Hotplug Mem Driver"); |
1da177e4 LT |
49 | MODULE_LICENSE("GPL"); |
50 | ||
1da177e4 LT |
51 | /* Memory Device States */ |
52 | #define MEMORY_INVALID_STATE 0 | |
53 | #define MEMORY_POWER_ON_STATE 1 | |
54 | #define MEMORY_POWER_OFF_STATE 2 | |
55 | ||
4be44fcd LB |
56 | static int acpi_memory_device_add(struct acpi_device *device); |
57 | static int acpi_memory_device_remove(struct acpi_device *device, int type); | |
1da177e4 | 58 | |
1ba90e3a TR |
59 | static const struct acpi_device_id memory_device_ids[] = { |
60 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
61 | {"", 0}, | |
62 | }; | |
63 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
64 | ||
1da177e4 | 65 | static struct acpi_driver acpi_memory_device_driver = { |
c2b6705b | 66 | .name = "acpi_memhotplug", |
4be44fcd | 67 | .class = ACPI_MEMORY_DEVICE_CLASS, |
1ba90e3a | 68 | .ids = memory_device_ids, |
4be44fcd LB |
69 | .ops = { |
70 | .add = acpi_memory_device_add, | |
71 | .remove = acpi_memory_device_remove, | |
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; | |
65479472 | 82 | unsigned int failed:1; |
9ac02398 KH |
83 | }; |
84 | ||
1da177e4 | 85 | struct acpi_memory_device { |
3b74863d | 86 | struct acpi_device * device; |
4be44fcd | 87 | unsigned int state; /* State of the memory device */ |
9ac02398 | 88 | struct list_head res_list; |
1da177e4 LT |
89 | }; |
90 | ||
9ac02398 KH |
91 | static acpi_status |
92 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
93 | { | |
94 | struct acpi_memory_device *mem_device = context; | |
95 | struct acpi_resource_address64 address64; | |
96 | struct acpi_memory_info *info, *new; | |
97 | acpi_status status; | |
98 | ||
99 | status = acpi_resource_to_address64(resource, &address64); | |
100 | if (ACPI_FAILURE(status) || | |
101 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
102 | return AE_OK; | |
103 | ||
104 | list_for_each_entry(info, &mem_device->res_list, list) { | |
105 | /* Can we combine the resource range information? */ | |
106 | if ((info->caching == address64.info.mem.caching) && | |
107 | (info->write_protect == address64.info.mem.write_protect) && | |
108 | (info->start_addr + info->length == address64.minimum)) { | |
109 | info->length += address64.address_length; | |
110 | return AE_OK; | |
111 | } | |
112 | } | |
113 | ||
114 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
115 | if (!new) | |
116 | return AE_ERROR; | |
117 | ||
118 | INIT_LIST_HEAD(&new->list); | |
119 | new->caching = address64.info.mem.caching; | |
120 | new->write_protect = address64.info.mem.write_protect; | |
121 | new->start_addr = address64.minimum; | |
122 | new->length = address64.address_length; | |
123 | list_add_tail(&new->list, &mem_device->res_list); | |
124 | ||
125 | return AE_OK; | |
126 | } | |
127 | ||
386e52b9 WC |
128 | static void |
129 | acpi_memory_free_device_resources(struct acpi_memory_device *mem_device) | |
130 | { | |
131 | struct acpi_memory_info *info, *n; | |
132 | ||
133 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
134 | kfree(info); | |
135 | INIT_LIST_HEAD(&mem_device->res_list); | |
136 | } | |
137 | ||
1da177e4 LT |
138 | static int |
139 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
140 | { | |
141 | acpi_status status; | |
1da177e4 | 142 | |
5d2870fa KH |
143 | if (!list_empty(&mem_device->res_list)) |
144 | return 0; | |
145 | ||
b8632785 | 146 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
9ac02398 KH |
147 | acpi_memory_get_resource, mem_device); |
148 | if (ACPI_FAILURE(status)) { | |
386e52b9 | 149 | acpi_memory_free_device_resources(mem_device); |
d550d98d | 150 | return -EINVAL; |
1da177e4 LT |
151 | } |
152 | ||
d550d98d | 153 | return 0; |
1da177e4 LT |
154 | } |
155 | ||
156 | static int | |
157 | acpi_memory_get_device(acpi_handle handle, | |
4be44fcd | 158 | struct acpi_memory_device **mem_device) |
1da177e4 | 159 | { |
1da177e4 | 160 | struct acpi_device *device = NULL; |
aa7b2b2e | 161 | int result; |
1da177e4 | 162 | |
1da177e4 LT |
163 | if (!acpi_bus_get_device(handle, &device) && device) |
164 | goto end; | |
165 | ||
1da177e4 LT |
166 | /* |
167 | * Now add the notified device. This creates the acpi_device | |
168 | * and invokes .add function | |
169 | */ | |
0cd6ac52 | 170 | result = acpi_bus_add(handle); |
aa7b2b2e | 171 | if (result) { |
ab6c5709 | 172 | acpi_handle_warn(handle, "Cannot add acpi bus\n"); |
d550d98d | 173 | return -EINVAL; |
1da177e4 | 174 | } |
0cd6ac52 RW |
175 | result = acpi_bus_get_device(handle, &device); |
176 | if (result) { | |
177 | acpi_handle_warn(handle, "Missing device object\n"); | |
178 | return -EINVAL; | |
179 | } | |
1da177e4 | 180 | |
4be44fcd | 181 | end: |
1da177e4 LT |
182 | *mem_device = acpi_driver_data(device); |
183 | if (!(*mem_device)) { | |
ab6c5709 | 184 | dev_err(&device->dev, "driver data not found\n"); |
d550d98d | 185 | return -ENODEV; |
1da177e4 LT |
186 | } |
187 | ||
d550d98d | 188 | return 0; |
1da177e4 LT |
189 | } |
190 | ||
4be44fcd | 191 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 | 192 | { |
27663c58 | 193 | unsigned long long current_status; |
1da177e4 LT |
194 | |
195 | /* Get device present/absent information from the _STA */ | |
b8632785 | 196 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 197 | NULL, ¤t_status))) |
d550d98d | 198 | return -ENODEV; |
1da177e4 LT |
199 | /* |
200 | * Check for device status. Device should be | |
201 | * present/enabled/functioning. | |
202 | */ | |
a0bd4ac4 BH |
203 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) |
204 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
205 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
d550d98d | 206 | return -ENODEV; |
1da177e4 | 207 | |
d550d98d | 208 | return 0; |
1da177e4 LT |
209 | } |
210 | ||
4be44fcd | 211 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
1da177e4 | 212 | { |
9ac02398 KH |
213 | int result, num_enabled = 0; |
214 | struct acpi_memory_info *info; | |
1e3590e2 | 215 | int node; |
1da177e4 | 216 | |
1da177e4 LT |
217 | |
218 | /* Get the range from the _CRS */ | |
219 | result = acpi_memory_get_device_resources(mem_device); | |
220 | if (result) { | |
ab6c5709 TK |
221 | dev_err(&mem_device->device->dev, |
222 | "get_device_resources failed\n"); | |
1da177e4 LT |
223 | mem_device->state = MEMORY_INVALID_STATE; |
224 | return result; | |
225 | } | |
226 | ||
b8632785 | 227 | node = acpi_get_node(mem_device->device->handle); |
1da177e4 LT |
228 | /* |
229 | * Tell the VM there is more memory here... | |
230 | * Note: Assume that this function returns zero on success | |
9ac02398 KH |
231 | * We don't have memory-hot-add rollback function,now. |
232 | * (i.e. memory-hot-remove function) | |
1da177e4 | 233 | */ |
9ac02398 | 234 | list_for_each_entry(info, &mem_device->res_list, list) { |
fa25d8d6 | 235 | if (info->enabled) { /* just sanity check...*/ |
dd56a8e3 YG |
236 | num_enabled++; |
237 | continue; | |
238 | } | |
5d2619fc ZY |
239 | /* |
240 | * If the memory block size is zero, please ignore it. | |
241 | * Don't try to do the following memory hotplug flowchart. | |
242 | */ | |
243 | if (!info->length) | |
244 | continue; | |
8c2676a5 KM |
245 | if (node < 0) |
246 | node = memory_add_physaddr_to_nid(info->start_addr); | |
247 | ||
bc02af93 | 248 | result = add_memory(node, info->start_addr, info->length); |
65479472 WC |
249 | |
250 | /* | |
251 | * If the memory block has been used by the kernel, add_memory() | |
252 | * returns -EEXIST. If add_memory() returns the other error, it | |
253 | * means that this memory block is not used by the kernel. | |
254 | */ | |
255 | if (result && result != -EEXIST) { | |
256 | info->failed = 1; | |
9ac02398 | 257 | continue; |
65479472 WC |
258 | } |
259 | ||
260 | if (!result) | |
261 | info->enabled = 1; | |
262 | /* | |
263 | * Add num_enable even if add_memory() returns -EEXIST, so the | |
264 | * device is bound to this driver. | |
265 | */ | |
9ac02398 KH |
266 | num_enabled++; |
267 | } | |
268 | if (!num_enabled) { | |
ab6c5709 | 269 | dev_err(&mem_device->device->dev, "add_memory failed\n"); |
1da177e4 | 270 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 271 | return -EINVAL; |
1da177e4 | 272 | } |
5d2619fc ZY |
273 | /* |
274 | * Sometimes the memory device will contain several memory blocks. | |
275 | * When one memory block is hot-added to the system memory, it will | |
276 | * be regarded as a success. | |
277 | * Otherwise if the last memory block can't be hot-added to the system | |
278 | * memory, it will be failure and the memory device can't be bound with | |
279 | * driver. | |
280 | */ | |
281 | return 0; | |
1da177e4 LT |
282 | } |
283 | ||
19387b27 | 284 | static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device) |
1da177e4 | 285 | { |
65479472 | 286 | int result = 0; |
9ac02398 | 287 | struct acpi_memory_info *info, *n; |
1da177e4 | 288 | |
9ac02398 | 289 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
65479472 WC |
290 | if (info->failed) |
291 | /* The kernel does not use this memory block */ | |
292 | continue; | |
293 | ||
294 | if (!info->enabled) | |
295 | /* | |
296 | * The kernel uses this memory block, but it may be not | |
297 | * managed by us. | |
298 | */ | |
299 | return -EBUSY; | |
300 | ||
301 | result = remove_memory(info->start_addr, info->length); | |
302 | if (result) | |
303 | return result; | |
19387b27 YI |
304 | |
305 | list_del(&info->list); | |
9ac02398 | 306 | kfree(info); |
1da177e4 LT |
307 | } |
308 | ||
65479472 | 309 | return result; |
19387b27 YI |
310 | } |
311 | ||
4be44fcd | 312 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 LT |
313 | { |
314 | struct acpi_memory_device *mem_device; | |
315 | struct acpi_device *device; | |
315bbae9 | 316 | struct acpi_eject_event *ej_event = NULL; |
b1f00de6 | 317 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ |
1da177e4 LT |
318 | |
319 | switch (event) { | |
320 | case ACPI_NOTIFY_BUS_CHECK: | |
321 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 322 | "\nReceived BUS CHECK notification for device\n")); |
1da177e4 LT |
323 | /* Fall Through */ |
324 | case ACPI_NOTIFY_DEVICE_CHECK: | |
325 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
326 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 327 | "\nReceived DEVICE CHECK notification for device\n")); |
1da177e4 | 328 | if (acpi_memory_get_device(handle, &mem_device)) { |
ab6c5709 | 329 | acpi_handle_err(handle, "Cannot find driver data\n"); |
b1f00de6 | 330 | break; |
1da177e4 LT |
331 | } |
332 | ||
b1f00de6 TK |
333 | if (acpi_memory_check_device(mem_device)) |
334 | break; | |
335 | ||
336 | if (acpi_memory_enable_device(mem_device)) { | |
ab6c5709 | 337 | acpi_handle_err(handle,"Cannot enable memory device\n"); |
b1f00de6 | 338 | break; |
1da177e4 | 339 | } |
b1f00de6 TK |
340 | |
341 | ost_code = ACPI_OST_SC_SUCCESS; | |
1da177e4 | 342 | break; |
b1f00de6 | 343 | |
1da177e4 LT |
344 | case ACPI_NOTIFY_EJECT_REQUEST: |
345 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 346 | "\nReceived EJECT REQUEST notification for device\n")); |
1da177e4 LT |
347 | |
348 | if (acpi_bus_get_device(handle, &device)) { | |
ab6c5709 | 349 | acpi_handle_err(handle, "Device doesn't exist\n"); |
1da177e4 LT |
350 | break; |
351 | } | |
352 | mem_device = acpi_driver_data(device); | |
353 | if (!mem_device) { | |
ab6c5709 | 354 | acpi_handle_err(handle, "Driver Data is NULL\n"); |
1da177e4 LT |
355 | break; |
356 | } | |
357 | ||
315bbae9 WC |
358 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); |
359 | if (!ej_event) { | |
360 | pr_err(PREFIX "No memory, dropping EJECT\n"); | |
b1f00de6 TK |
361 | break; |
362 | } | |
363 | ||
5993c467 | 364 | ej_event->device = device; |
315bbae9 WC |
365 | ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; |
366 | acpi_os_hotplug_execute(acpi_bus_hot_remove_device, | |
367 | (void *)ej_event); | |
b1f00de6 | 368 | |
315bbae9 | 369 | /* eject is performed asynchronously */ |
b1f00de6 | 370 | return; |
1da177e4 LT |
371 | default: |
372 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 373 | "Unsupported event [0x%x]\n", event)); |
b1f00de6 TK |
374 | |
375 | /* non-hotplug event; possibly handled by other handler */ | |
376 | return; | |
1da177e4 LT |
377 | } |
378 | ||
b1f00de6 TK |
379 | /* Inform firmware that the hotplug operation has completed */ |
380 | (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL); | |
d550d98d | 381 | return; |
1da177e4 LT |
382 | } |
383 | ||
386e52b9 WC |
384 | static void acpi_memory_device_free(struct acpi_memory_device *mem_device) |
385 | { | |
386 | if (!mem_device) | |
387 | return; | |
388 | ||
389 | acpi_memory_free_device_resources(mem_device); | |
390 | kfree(mem_device); | |
391 | } | |
392 | ||
4be44fcd | 393 | static int acpi_memory_device_add(struct acpi_device *device) |
1da177e4 LT |
394 | { |
395 | int result; | |
396 | struct acpi_memory_device *mem_device = NULL; | |
397 | ||
1da177e4 LT |
398 | |
399 | if (!device) | |
d550d98d | 400 | return -EINVAL; |
1da177e4 | 401 | |
36bcbec7 | 402 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
1da177e4 | 403 | if (!mem_device) |
d550d98d | 404 | return -ENOMEM; |
1da177e4 | 405 | |
9ac02398 | 406 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 407 | mem_device->device = device; |
1da177e4 LT |
408 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
409 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
db89b4f0 | 410 | device->driver_data = mem_device; |
1da177e4 LT |
411 | |
412 | /* Get the range from the _CRS */ | |
413 | result = acpi_memory_get_device_resources(mem_device); | |
414 | if (result) { | |
415 | kfree(mem_device); | |
d550d98d | 416 | return result; |
1da177e4 LT |
417 | } |
418 | ||
419 | /* Set the device state */ | |
420 | mem_device->state = MEMORY_POWER_ON_STATE; | |
421 | ||
ab6c5709 | 422 | pr_debug("%s\n", acpi_device_name(device)); |
1da177e4 | 423 | |
1f425994 YG |
424 | if (!acpi_memory_check_device(mem_device)) { |
425 | /* call add_memory func */ | |
426 | result = acpi_memory_enable_device(mem_device); | |
e0b7b24d | 427 | if (result) { |
ab6c5709 | 428 | dev_err(&device->dev, |
55ac9a01 | 429 | "Error in acpi_memory_enable_device\n"); |
e0b7b24d WC |
430 | acpi_memory_device_free(mem_device); |
431 | } | |
1f425994 | 432 | } |
d120cfb5 | 433 | return result; |
1f425994 YG |
434 | } |
435 | ||
80f20fef BH |
436 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
437 | { | |
438 | struct acpi_memory_device *mem_device = NULL; | |
19387b27 | 439 | int result; |
80f20fef BH |
440 | |
441 | if (!device || !acpi_driver_data(device)) | |
442 | return -EINVAL; | |
443 | ||
444 | mem_device = acpi_driver_data(device); | |
19387b27 YI |
445 | |
446 | result = acpi_memory_remove_memory(mem_device); | |
447 | if (result) | |
448 | return result; | |
449 | ||
386e52b9 | 450 | acpi_memory_device_free(mem_device); |
80f20fef BH |
451 | |
452 | return 0; | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* |
456 | * Helper function to check for memory device | |
457 | */ | |
4be44fcd | 458 | static acpi_status is_memory_device(acpi_handle handle) |
1da177e4 LT |
459 | { |
460 | char *hardware_id; | |
461 | acpi_status status; | |
1da177e4 LT |
462 | struct acpi_device_info *info; |
463 | ||
15b8dd53 | 464 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 465 | if (ACPI_FAILURE(status)) |
d550d98d | 466 | return status; |
1da177e4 | 467 | |
1da177e4 | 468 | if (!(info->valid & ACPI_VALID_HID)) { |
15b8dd53 | 469 | kfree(info); |
d550d98d | 470 | return AE_ERROR; |
1da177e4 LT |
471 | } |
472 | ||
15b8dd53 | 473 | hardware_id = info->hardware_id.string; |
1da177e4 | 474 | if ((hardware_id == NULL) || |
4be44fcd | 475 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
1da177e4 LT |
476 | status = AE_ERROR; |
477 | ||
15b8dd53 | 478 | kfree(info); |
d550d98d | 479 | return status; |
1da177e4 LT |
480 | } |
481 | ||
482 | static acpi_status | |
4be44fcd LB |
483 | acpi_memory_register_notify_handler(acpi_handle handle, |
484 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
485 | { |
486 | acpi_status status; | |
487 | ||
1da177e4 LT |
488 | |
489 | status = is_memory_device(handle); | |
07dd4855 | 490 | if (ACPI_FAILURE(status)) |
d550d98d | 491 | return AE_OK; /* continue */ |
1da177e4 LT |
492 | |
493 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
4be44fcd | 494 | acpi_memory_device_notify, NULL); |
a6fc6720 | 495 | /* continue */ |
d550d98d | 496 | return AE_OK; |
1da177e4 LT |
497 | } |
498 | ||
499 | static acpi_status | |
4be44fcd LB |
500 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
501 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
502 | { |
503 | acpi_status status; | |
504 | ||
1da177e4 LT |
505 | |
506 | status = is_memory_device(handle); | |
07dd4855 | 507 | if (ACPI_FAILURE(status)) |
d550d98d | 508 | return AE_OK; /* continue */ |
1da177e4 LT |
509 | |
510 | status = acpi_remove_notify_handler(handle, | |
4be44fcd LB |
511 | ACPI_SYSTEM_NOTIFY, |
512 | acpi_memory_device_notify); | |
1da177e4 | 513 | |
d550d98d | 514 | return AE_OK; /* continue */ |
1da177e4 LT |
515 | } |
516 | ||
4be44fcd | 517 | static int __init acpi_memory_device_init(void) |
1da177e4 LT |
518 | { |
519 | int result; | |
520 | acpi_status status; | |
521 | ||
1da177e4 LT |
522 | |
523 | result = acpi_bus_register_driver(&acpi_memory_device_driver); | |
524 | ||
525 | if (result < 0) | |
d550d98d | 526 | return -ENODEV; |
1da177e4 LT |
527 | |
528 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd | 529 | ACPI_UINT32_MAX, |
2263576c | 530 | acpi_memory_register_notify_handler, NULL, |
4be44fcd | 531 | NULL, NULL); |
1da177e4 | 532 | |
4be44fcd | 533 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 534 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 | 535 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
d550d98d | 536 | return -ENODEV; |
4be44fcd | 537 | } |
1da177e4 | 538 | |
d550d98d | 539 | return 0; |
1da177e4 LT |
540 | } |
541 | ||
4be44fcd | 542 | static void __exit acpi_memory_device_exit(void) |
1da177e4 LT |
543 | { |
544 | acpi_status status; | |
545 | ||
1da177e4 LT |
546 | |
547 | /* | |
548 | * Adding this to un-install notification handlers for all the device | |
549 | * handles. | |
550 | */ | |
551 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd | 552 | ACPI_UINT32_MAX, |
2263576c | 553 | acpi_memory_deregister_notify_handler, NULL, |
4be44fcd | 554 | NULL, NULL); |
1da177e4 | 555 | |
4be44fcd | 556 | if (ACPI_FAILURE(status)) |
a6fc6720 | 557 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 LT |
558 | |
559 | acpi_bus_unregister_driver(&acpi_memory_device_driver); | |
560 | ||
d550d98d | 561 | return; |
1da177e4 LT |
562 | } |
563 | ||
564 | module_init(acpi_memory_device_init); | |
565 | module_exit(acpi_memory_device_exit); |