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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); | |
1da177e4 | 56 | |
1ba90e3a TR |
57 | static const struct acpi_device_id memory_device_ids[] = { |
58 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
59 | {"", 0}, | |
60 | }; | |
61 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
62 | ||
1da177e4 | 63 | static struct acpi_driver acpi_memory_device_driver = { |
c2b6705b | 64 | .name = "acpi_memhotplug", |
4be44fcd | 65 | .class = ACPI_MEMORY_DEVICE_CLASS, |
1ba90e3a | 66 | .ids = memory_device_ids, |
4be44fcd LB |
67 | .ops = { |
68 | .add = acpi_memory_device_add, | |
69 | .remove = acpi_memory_device_remove, | |
70 | }, | |
1da177e4 LT |
71 | }; |
72 | ||
9ac02398 KH |
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 | ||
1da177e4 | 82 | struct acpi_memory_device { |
3b74863d | 83 | struct acpi_device * device; |
4be44fcd | 84 | unsigned int state; /* State of the memory device */ |
9ac02398 | 85 | struct list_head res_list; |
1da177e4 LT |
86 | }; |
87 | ||
887b9593 YG |
88 | static int acpi_hotmem_initialized; |
89 | ||
9ac02398 KH |
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 | ||
1da177e4 LT |
127 | static int |
128 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
129 | { | |
130 | acpi_status status; | |
9ac02398 | 131 | struct acpi_memory_info *info, *n; |
1da177e4 | 132 | |
1da177e4 | 133 | |
5d2870fa KH |
134 | if (!list_empty(&mem_device->res_list)) |
135 | return 0; | |
136 | ||
b8632785 | 137 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
9ac02398 KH |
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); | |
5d2870fa | 142 | INIT_LIST_HEAD(&mem_device->res_list); |
d550d98d | 143 | return -EINVAL; |
1da177e4 LT |
144 | } |
145 | ||
d550d98d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
149 | static int | |
150 | acpi_memory_get_device(acpi_handle handle, | |
4be44fcd | 151 | struct acpi_memory_device **mem_device) |
1da177e4 LT |
152 | { |
153 | acpi_status status; | |
154 | acpi_handle phandle; | |
155 | struct acpi_device *device = NULL; | |
156 | struct acpi_device *pdevice = NULL; | |
aa7b2b2e | 157 | int result; |
1da177e4 | 158 | |
1da177e4 LT |
159 | |
160 | if (!acpi_bus_get_device(handle, &device) && device) | |
161 | goto end; | |
162 | ||
163 | status = acpi_get_parent(handle, &phandle); | |
164 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 165 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
d550d98d | 166 | return -EINVAL; |
1da177e4 LT |
167 | } |
168 | ||
169 | /* Get the parent device */ | |
aa7b2b2e ZY |
170 | result = acpi_bus_get_device(phandle, &pdevice); |
171 | if (result) { | |
172 | printk(KERN_WARNING PREFIX "Cannot get acpi bus device"); | |
d550d98d | 173 | return -EINVAL; |
1da177e4 LT |
174 | } |
175 | ||
176 | /* | |
177 | * Now add the notified device. This creates the acpi_device | |
178 | * and invokes .add function | |
179 | */ | |
aa7b2b2e ZY |
180 | result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
181 | if (result) { | |
182 | printk(KERN_WARNING PREFIX "Cannot add acpi bus"); | |
d550d98d | 183 | return -EINVAL; |
1da177e4 LT |
184 | } |
185 | ||
4be44fcd | 186 | end: |
1da177e4 LT |
187 | *mem_device = acpi_driver_data(device); |
188 | if (!(*mem_device)) { | |
4be44fcd | 189 | printk(KERN_ERR "\n driver data not found"); |
d550d98d | 190 | return -ENODEV; |
1da177e4 LT |
191 | } |
192 | ||
d550d98d | 193 | return 0; |
1da177e4 LT |
194 | } |
195 | ||
4be44fcd | 196 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 | 197 | { |
27663c58 | 198 | unsigned long long current_status; |
1da177e4 LT |
199 | |
200 | /* Get device present/absent information from the _STA */ | |
b8632785 | 201 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 202 | NULL, ¤t_status))) |
d550d98d | 203 | return -ENODEV; |
1da177e4 LT |
204 | /* |
205 | * Check for device status. Device should be | |
206 | * present/enabled/functioning. | |
207 | */ | |
a0bd4ac4 BH |
208 | if (!((current_status & ACPI_STA_DEVICE_PRESENT) |
209 | && (current_status & ACPI_STA_DEVICE_ENABLED) | |
210 | && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) | |
d550d98d | 211 | return -ENODEV; |
1da177e4 | 212 | |
d550d98d | 213 | return 0; |
1da177e4 LT |
214 | } |
215 | ||
4be44fcd | 216 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
1da177e4 | 217 | { |
9ac02398 KH |
218 | int result, num_enabled = 0; |
219 | struct acpi_memory_info *info; | |
1e3590e2 | 220 | int node; |
1da177e4 | 221 | |
1da177e4 LT |
222 | |
223 | /* Get the range from the _CRS */ | |
224 | result = acpi_memory_get_device_resources(mem_device); | |
225 | if (result) { | |
6468463a | 226 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
1da177e4 LT |
227 | mem_device->state = MEMORY_INVALID_STATE; |
228 | return result; | |
229 | } | |
230 | ||
b8632785 | 231 | node = acpi_get_node(mem_device->device->handle); |
1da177e4 LT |
232 | /* |
233 | * Tell the VM there is more memory here... | |
234 | * Note: Assume that this function returns zero on success | |
9ac02398 KH |
235 | * We don't have memory-hot-add rollback function,now. |
236 | * (i.e. memory-hot-remove function) | |
1da177e4 | 237 | */ |
9ac02398 | 238 | list_for_each_entry(info, &mem_device->res_list, list) { |
fa25d8d6 | 239 | if (info->enabled) { /* just sanity check...*/ |
dd56a8e3 YG |
240 | num_enabled++; |
241 | continue; | |
242 | } | |
5d2619fc ZY |
243 | /* |
244 | * If the memory block size is zero, please ignore it. | |
245 | * Don't try to do the following memory hotplug flowchart. | |
246 | */ | |
247 | if (!info->length) | |
248 | continue; | |
8c2676a5 KM |
249 | if (node < 0) |
250 | node = memory_add_physaddr_to_nid(info->start_addr); | |
251 | ||
bc02af93 | 252 | result = add_memory(node, info->start_addr, info->length); |
9ac02398 KH |
253 | if (result) |
254 | continue; | |
255 | info->enabled = 1; | |
256 | num_enabled++; | |
257 | } | |
258 | if (!num_enabled) { | |
0a1f1ab8 | 259 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
1da177e4 | 260 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 261 | return -EINVAL; |
1da177e4 | 262 | } |
5d2619fc ZY |
263 | /* |
264 | * Sometimes the memory device will contain several memory blocks. | |
265 | * When one memory block is hot-added to the system memory, it will | |
266 | * be regarded as a success. | |
267 | * Otherwise if the last memory block can't be hot-added to the system | |
268 | * memory, it will be failure and the memory device can't be bound with | |
269 | * driver. | |
270 | */ | |
271 | return 0; | |
1da177e4 LT |
272 | } |
273 | ||
4be44fcd | 274 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
275 | { |
276 | acpi_status status; | |
4be44fcd | 277 | struct acpi_object_list arg_list; |
1da177e4 | 278 | union acpi_object arg; |
27663c58 | 279 | unsigned long long current_status; |
1da177e4 | 280 | |
1da177e4 LT |
281 | |
282 | /* Issue the _EJ0 command */ | |
283 | arg_list.count = 1; | |
284 | arg_list.pointer = &arg; | |
285 | arg.type = ACPI_TYPE_INTEGER; | |
286 | arg.integer.value = 1; | |
b8632785 | 287 | status = acpi_evaluate_object(mem_device->device->handle, |
4be44fcd | 288 | "_EJ0", &arg_list, NULL); |
1da177e4 LT |
289 | /* Return on _EJ0 failure */ |
290 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 291 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
d550d98d | 292 | return -ENODEV; |
1da177e4 LT |
293 | } |
294 | ||
295 | /* Evalute _STA to check if the device is disabled */ | |
b8632785 | 296 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 297 | NULL, ¤t_status); |
1da177e4 | 298 | if (ACPI_FAILURE(status)) |
d550d98d | 299 | return -ENODEV; |
1da177e4 LT |
300 | |
301 | /* Check for device status. Device should be disabled */ | |
a0bd4ac4 | 302 | if (current_status & ACPI_STA_DEVICE_ENABLED) |
d550d98d | 303 | return -EINVAL; |
1da177e4 | 304 | |
d550d98d | 305 | return 0; |
1da177e4 LT |
306 | } |
307 | ||
4be44fcd | 308 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
309 | { |
310 | int result; | |
9ac02398 | 311 | struct acpi_memory_info *info, *n; |
1da177e4 | 312 | |
1da177e4 LT |
313 | |
314 | /* | |
315 | * Ask the VM to offline this memory range. | |
316 | * Note: Assume that this function returns zero on success | |
317 | */ | |
9ac02398 KH |
318 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
319 | if (info->enabled) { | |
320 | result = remove_memory(info->start_addr, info->length); | |
321 | if (result) | |
322 | return result; | |
323 | } | |
324 | kfree(info); | |
1da177e4 LT |
325 | } |
326 | ||
327 | /* Power-off and eject the device */ | |
328 | result = acpi_memory_powerdown_device(mem_device); | |
329 | if (result) { | |
1da177e4 LT |
330 | /* Set the status of the device to invalid */ |
331 | mem_device->state = MEMORY_INVALID_STATE; | |
332 | return result; | |
333 | } | |
334 | ||
335 | mem_device->state = MEMORY_POWER_OFF_STATE; | |
336 | return result; | |
337 | } | |
338 | ||
4be44fcd | 339 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 LT |
340 | { |
341 | struct acpi_memory_device *mem_device; | |
342 | struct acpi_device *device; | |
343 | ||
1da177e4 LT |
344 | |
345 | switch (event) { | |
346 | case ACPI_NOTIFY_BUS_CHECK: | |
347 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 348 | "\nReceived BUS CHECK notification for device\n")); |
1da177e4 LT |
349 | /* Fall Through */ |
350 | case ACPI_NOTIFY_DEVICE_CHECK: | |
351 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
352 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 353 | "\nReceived DEVICE CHECK notification for device\n")); |
1da177e4 | 354 | if (acpi_memory_get_device(handle, &mem_device)) { |
6468463a | 355 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
d550d98d | 356 | return; |
1da177e4 LT |
357 | } |
358 | ||
359 | if (!acpi_memory_check_device(mem_device)) { | |
360 | if (acpi_memory_enable_device(mem_device)) | |
6468463a LB |
361 | printk(KERN_ERR PREFIX |
362 | "Cannot enable memory device\n"); | |
1da177e4 LT |
363 | } |
364 | break; | |
365 | case ACPI_NOTIFY_EJECT_REQUEST: | |
366 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 367 | "\nReceived EJECT REQUEST notification for device\n")); |
1da177e4 LT |
368 | |
369 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a | 370 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
1da177e4 LT |
371 | break; |
372 | } | |
373 | mem_device = acpi_driver_data(device); | |
374 | if (!mem_device) { | |
6468463a | 375 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
1da177e4 LT |
376 | break; |
377 | } | |
378 | ||
379 | /* | |
380 | * Currently disabling memory device from kernel mode | |
381 | * TBD: Can also be disabled from user mode scripts | |
382 | * TBD: Can also be disabled by Callback registration | |
4be44fcd | 383 | * with generic sysfs driver |
1da177e4 LT |
384 | */ |
385 | if (acpi_memory_disable_device(mem_device)) | |
6468463a LB |
386 | printk(KERN_ERR PREFIX |
387 | "Disable memory device\n"); | |
1da177e4 LT |
388 | /* |
389 | * TBD: Invoke acpi_bus_remove to cleanup data structures | |
390 | */ | |
391 | break; | |
392 | default: | |
393 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 394 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
395 | break; |
396 | } | |
397 | ||
d550d98d | 398 | return; |
1da177e4 LT |
399 | } |
400 | ||
4be44fcd | 401 | static int acpi_memory_device_add(struct acpi_device *device) |
1da177e4 LT |
402 | { |
403 | int result; | |
404 | struct acpi_memory_device *mem_device = NULL; | |
405 | ||
1da177e4 LT |
406 | |
407 | if (!device) | |
d550d98d | 408 | return -EINVAL; |
1da177e4 | 409 | |
36bcbec7 | 410 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
1da177e4 | 411 | if (!mem_device) |
d550d98d | 412 | return -ENOMEM; |
1da177e4 | 413 | |
9ac02398 | 414 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 415 | mem_device->device = device; |
1da177e4 LT |
416 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
417 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
db89b4f0 | 418 | device->driver_data = mem_device; |
1da177e4 LT |
419 | |
420 | /* Get the range from the _CRS */ | |
421 | result = acpi_memory_get_device_resources(mem_device); | |
422 | if (result) { | |
423 | kfree(mem_device); | |
d550d98d | 424 | return result; |
1da177e4 LT |
425 | } |
426 | ||
427 | /* Set the device state */ | |
428 | mem_device->state = MEMORY_POWER_ON_STATE; | |
429 | ||
6cbe44cd | 430 | printk(KERN_DEBUG "%s \n", acpi_device_name(device)); |
1da177e4 | 431 | |
887b9593 YG |
432 | /* |
433 | * Early boot code has recognized memory area by EFI/E820. | |
434 | * If DSDT shows these memory devices on boot, hotplug is not necessary | |
435 | * for them. So, it just returns until completion of this driver's | |
436 | * start up. | |
437 | */ | |
438 | if (!acpi_hotmem_initialized) | |
439 | return 0; | |
440 | ||
1f425994 YG |
441 | if (!acpi_memory_check_device(mem_device)) { |
442 | /* call add_memory func */ | |
443 | result = acpi_memory_enable_device(mem_device); | |
444 | if (result) | |
55ac9a01 LM |
445 | printk(KERN_ERR PREFIX |
446 | "Error in acpi_memory_enable_device\n"); | |
1f425994 | 447 | } |
d120cfb5 | 448 | return result; |
1f425994 YG |
449 | } |
450 | ||
80f20fef BH |
451 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
452 | { | |
453 | struct acpi_memory_device *mem_device = NULL; | |
454 | ||
455 | ||
456 | if (!device || !acpi_driver_data(device)) | |
457 | return -EINVAL; | |
458 | ||
459 | mem_device = acpi_driver_data(device); | |
460 | kfree(mem_device); | |
461 | ||
462 | return 0; | |
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; | |
1da177e4 LT |
472 | struct acpi_device_info *info; |
473 | ||
15b8dd53 | 474 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 475 | if (ACPI_FAILURE(status)) |
d550d98d | 476 | return status; |
1da177e4 | 477 | |
1da177e4 | 478 | if (!(info->valid & ACPI_VALID_HID)) { |
15b8dd53 | 479 | kfree(info); |
d550d98d | 480 | return AE_ERROR; |
1da177e4 LT |
481 | } |
482 | ||
15b8dd53 | 483 | hardware_id = info->hardware_id.string; |
1da177e4 | 484 | if ((hardware_id == NULL) || |
4be44fcd | 485 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
1da177e4 LT |
486 | status = AE_ERROR; |
487 | ||
15b8dd53 | 488 | kfree(info); |
d550d98d | 489 | return status; |
1da177e4 LT |
490 | } |
491 | ||
492 | static acpi_status | |
4be44fcd LB |
493 | acpi_memory_register_notify_handler(acpi_handle handle, |
494 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
495 | { |
496 | acpi_status status; | |
497 | ||
1da177e4 LT |
498 | |
499 | status = is_memory_device(handle); | |
07dd4855 | 500 | if (ACPI_FAILURE(status)) |
d550d98d | 501 | return AE_OK; /* continue */ |
1da177e4 LT |
502 | |
503 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
4be44fcd | 504 | acpi_memory_device_notify, NULL); |
a6fc6720 | 505 | /* continue */ |
d550d98d | 506 | return AE_OK; |
1da177e4 LT |
507 | } |
508 | ||
509 | static acpi_status | |
4be44fcd LB |
510 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
511 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
512 | { |
513 | acpi_status status; | |
514 | ||
1da177e4 LT |
515 | |
516 | status = is_memory_device(handle); | |
07dd4855 | 517 | if (ACPI_FAILURE(status)) |
d550d98d | 518 | return AE_OK; /* continue */ |
1da177e4 LT |
519 | |
520 | status = acpi_remove_notify_handler(handle, | |
4be44fcd LB |
521 | ACPI_SYSTEM_NOTIFY, |
522 | acpi_memory_device_notify); | |
1da177e4 | 523 | |
d550d98d | 524 | return AE_OK; /* continue */ |
1da177e4 LT |
525 | } |
526 | ||
4be44fcd | 527 | static int __init acpi_memory_device_init(void) |
1da177e4 LT |
528 | { |
529 | int result; | |
530 | acpi_status status; | |
531 | ||
1da177e4 LT |
532 | |
533 | result = acpi_bus_register_driver(&acpi_memory_device_driver); | |
534 | ||
535 | if (result < 0) | |
d550d98d | 536 | return -ENODEV; |
1da177e4 LT |
537 | |
538 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd | 539 | ACPI_UINT32_MAX, |
2263576c | 540 | acpi_memory_register_notify_handler, NULL, |
4be44fcd | 541 | NULL, NULL); |
1da177e4 | 542 | |
4be44fcd | 543 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 544 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 | 545 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
d550d98d | 546 | return -ENODEV; |
4be44fcd | 547 | } |
1da177e4 | 548 | |
887b9593 | 549 | acpi_hotmem_initialized = 1; |
d550d98d | 550 | return 0; |
1da177e4 LT |
551 | } |
552 | ||
4be44fcd | 553 | static void __exit acpi_memory_device_exit(void) |
1da177e4 LT |
554 | { |
555 | acpi_status status; | |
556 | ||
1da177e4 LT |
557 | |
558 | /* | |
559 | * Adding this to un-install notification handlers for all the device | |
560 | * handles. | |
561 | */ | |
562 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd | 563 | ACPI_UINT32_MAX, |
2263576c | 564 | acpi_memory_deregister_notify_handler, NULL, |
4be44fcd | 565 | NULL, NULL); |
1da177e4 | 566 | |
4be44fcd | 567 | if (ACPI_FAILURE(status)) |
a6fc6720 | 568 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 LT |
569 | |
570 | acpi_bus_unregister_driver(&acpi_memory_device_driver); | |
571 | ||
d550d98d | 572 | return; |
1da177e4 LT |
573 | } |
574 | ||
575 | module_init(acpi_memory_device_init); | |
576 | module_exit(acpi_memory_device_exit); |