Commit | Line | Data |
---|---|---|
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 | |
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 | ||
1da177e4 LT |
35 | #define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL |
36 | #define ACPI_MEMORY_DEVICE_CLASS "memory" | |
37 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" | |
1da177e4 LT |
38 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
39 | ||
40 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT | |
41 | ||
f52fd66d LB |
42 | ACPI_MODULE_NAME("acpi_memhotplug"); |
43 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); | |
7cda93e0 | 44 | MODULE_DESCRIPTION("Hotplug Mem Driver"); |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
1da177e4 LT |
47 | /* Memory Device States */ |
48 | #define MEMORY_INVALID_STATE 0 | |
49 | #define MEMORY_POWER_ON_STATE 1 | |
50 | #define MEMORY_POWER_OFF_STATE 2 | |
51 | ||
4be44fcd LB |
52 | static int acpi_memory_device_add(struct acpi_device *device); |
53 | static int acpi_memory_device_remove(struct acpi_device *device, int type); | |
1f425994 | 54 | static int acpi_memory_device_start(struct acpi_device *device); |
1da177e4 | 55 | |
1ba90e3a TR |
56 | static const struct acpi_device_id memory_device_ids[] = { |
57 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
58 | {"", 0}, | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(acpi, memory_device_ids); | |
61 | ||
1da177e4 | 62 | static struct acpi_driver acpi_memory_device_driver = { |
c2b6705b | 63 | .name = "acpi_memhotplug", |
4be44fcd | 64 | .class = ACPI_MEMORY_DEVICE_CLASS, |
1ba90e3a | 65 | .ids = memory_device_ids, |
4be44fcd LB |
66 | .ops = { |
67 | .add = acpi_memory_device_add, | |
68 | .remove = acpi_memory_device_remove, | |
1f425994 | 69 | .start = acpi_memory_device_start, |
4be44fcd | 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; | |
157 | ||
1da177e4 LT |
158 | |
159 | if (!acpi_bus_get_device(handle, &device) && device) | |
160 | goto end; | |
161 | ||
162 | status = acpi_get_parent(handle, &phandle); | |
163 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 164 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
d550d98d | 165 | return -EINVAL; |
1da177e4 LT |
166 | } |
167 | ||
168 | /* Get the parent device */ | |
169 | status = acpi_bus_get_device(phandle, &pdevice); | |
170 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 171 | ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device")); |
d550d98d | 172 | return -EINVAL; |
1da177e4 LT |
173 | } |
174 | ||
175 | /* | |
176 | * Now add the notified device. This creates the acpi_device | |
177 | * and invokes .add function | |
178 | */ | |
179 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); | |
180 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 181 | ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus")); |
d550d98d | 182 | return -EINVAL; |
1da177e4 LT |
183 | } |
184 | ||
4be44fcd | 185 | end: |
1da177e4 LT |
186 | *mem_device = acpi_driver_data(device); |
187 | if (!(*mem_device)) { | |
4be44fcd | 188 | printk(KERN_ERR "\n driver data not found"); |
d550d98d | 189 | return -ENODEV; |
1da177e4 LT |
190 | } |
191 | ||
d550d98d | 192 | return 0; |
1da177e4 LT |
193 | } |
194 | ||
4be44fcd | 195 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
196 | { |
197 | unsigned long current_status; | |
198 | ||
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 | } | |
8c2676a5 KM |
243 | |
244 | if (node < 0) | |
245 | node = memory_add_physaddr_to_nid(info->start_addr); | |
246 | ||
bc02af93 | 247 | result = add_memory(node, info->start_addr, info->length); |
9ac02398 KH |
248 | if (result) |
249 | continue; | |
250 | info->enabled = 1; | |
251 | num_enabled++; | |
252 | } | |
253 | if (!num_enabled) { | |
0a1f1ab8 | 254 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
1da177e4 | 255 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 256 | return -EINVAL; |
1da177e4 LT |
257 | } |
258 | ||
259 | return result; | |
260 | } | |
261 | ||
4be44fcd | 262 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
263 | { |
264 | acpi_status status; | |
4be44fcd | 265 | struct acpi_object_list arg_list; |
1da177e4 LT |
266 | union acpi_object arg; |
267 | unsigned long current_status; | |
268 | ||
1da177e4 LT |
269 | |
270 | /* Issue the _EJ0 command */ | |
271 | arg_list.count = 1; | |
272 | arg_list.pointer = &arg; | |
273 | arg.type = ACPI_TYPE_INTEGER; | |
274 | arg.integer.value = 1; | |
b8632785 | 275 | status = acpi_evaluate_object(mem_device->device->handle, |
4be44fcd | 276 | "_EJ0", &arg_list, NULL); |
1da177e4 LT |
277 | /* Return on _EJ0 failure */ |
278 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 279 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
d550d98d | 280 | return -ENODEV; |
1da177e4 LT |
281 | } |
282 | ||
283 | /* Evalute _STA to check if the device is disabled */ | |
b8632785 | 284 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 285 | NULL, ¤t_status); |
1da177e4 | 286 | if (ACPI_FAILURE(status)) |
d550d98d | 287 | return -ENODEV; |
1da177e4 LT |
288 | |
289 | /* Check for device status. Device should be disabled */ | |
a0bd4ac4 | 290 | if (current_status & ACPI_STA_DEVICE_ENABLED) |
d550d98d | 291 | return -EINVAL; |
1da177e4 | 292 | |
d550d98d | 293 | return 0; |
1da177e4 LT |
294 | } |
295 | ||
4be44fcd | 296 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
297 | { |
298 | int result; | |
9ac02398 | 299 | struct acpi_memory_info *info, *n; |
1da177e4 | 300 | |
1da177e4 LT |
301 | |
302 | /* | |
303 | * Ask the VM to offline this memory range. | |
304 | * Note: Assume that this function returns zero on success | |
305 | */ | |
9ac02398 KH |
306 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
307 | if (info->enabled) { | |
308 | result = remove_memory(info->start_addr, info->length); | |
309 | if (result) | |
310 | return result; | |
311 | } | |
312 | kfree(info); | |
1da177e4 LT |
313 | } |
314 | ||
315 | /* Power-off and eject the device */ | |
316 | result = acpi_memory_powerdown_device(mem_device); | |
317 | if (result) { | |
1da177e4 LT |
318 | /* Set the status of the device to invalid */ |
319 | mem_device->state = MEMORY_INVALID_STATE; | |
320 | return result; | |
321 | } | |
322 | ||
323 | mem_device->state = MEMORY_POWER_OFF_STATE; | |
324 | return result; | |
325 | } | |
326 | ||
4be44fcd | 327 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 LT |
328 | { |
329 | struct acpi_memory_device *mem_device; | |
330 | struct acpi_device *device; | |
331 | ||
1da177e4 LT |
332 | |
333 | switch (event) { | |
334 | case ACPI_NOTIFY_BUS_CHECK: | |
335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 336 | "\nReceived BUS CHECK notification for device\n")); |
1da177e4 LT |
337 | /* Fall Through */ |
338 | case ACPI_NOTIFY_DEVICE_CHECK: | |
339 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
340 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 341 | "\nReceived DEVICE CHECK notification for device\n")); |
1da177e4 | 342 | if (acpi_memory_get_device(handle, &mem_device)) { |
6468463a | 343 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
d550d98d | 344 | return; |
1da177e4 LT |
345 | } |
346 | ||
347 | if (!acpi_memory_check_device(mem_device)) { | |
348 | if (acpi_memory_enable_device(mem_device)) | |
6468463a LB |
349 | printk(KERN_ERR PREFIX |
350 | "Cannot enable memory device\n"); | |
1da177e4 LT |
351 | } |
352 | break; | |
353 | case ACPI_NOTIFY_EJECT_REQUEST: | |
354 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 355 | "\nReceived EJECT REQUEST notification for device\n")); |
1da177e4 LT |
356 | |
357 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a | 358 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
1da177e4 LT |
359 | break; |
360 | } | |
361 | mem_device = acpi_driver_data(device); | |
362 | if (!mem_device) { | |
6468463a | 363 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
1da177e4 LT |
364 | break; |
365 | } | |
366 | ||
367 | /* | |
368 | * Currently disabling memory device from kernel mode | |
369 | * TBD: Can also be disabled from user mode scripts | |
370 | * TBD: Can also be disabled by Callback registration | |
4be44fcd | 371 | * with generic sysfs driver |
1da177e4 LT |
372 | */ |
373 | if (acpi_memory_disable_device(mem_device)) | |
6468463a LB |
374 | printk(KERN_ERR PREFIX |
375 | "Disable memory device\n"); | |
1da177e4 LT |
376 | /* |
377 | * TBD: Invoke acpi_bus_remove to cleanup data structures | |
378 | */ | |
379 | break; | |
380 | default: | |
381 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 382 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
383 | break; |
384 | } | |
385 | ||
d550d98d | 386 | return; |
1da177e4 LT |
387 | } |
388 | ||
4be44fcd | 389 | static int acpi_memory_device_add(struct acpi_device *device) |
1da177e4 LT |
390 | { |
391 | int result; | |
392 | struct acpi_memory_device *mem_device = NULL; | |
393 | ||
1da177e4 LT |
394 | |
395 | if (!device) | |
d550d98d | 396 | return -EINVAL; |
1da177e4 | 397 | |
36bcbec7 | 398 | mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
1da177e4 | 399 | if (!mem_device) |
d550d98d | 400 | return -ENOMEM; |
1da177e4 | 401 | |
9ac02398 | 402 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 403 | mem_device->device = device; |
1da177e4 LT |
404 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
405 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
406 | acpi_driver_data(device) = mem_device; | |
407 | ||
408 | /* Get the range from the _CRS */ | |
409 | result = acpi_memory_get_device_resources(mem_device); | |
410 | if (result) { | |
411 | kfree(mem_device); | |
d550d98d | 412 | return result; |
1da177e4 LT |
413 | } |
414 | ||
415 | /* Set the device state */ | |
416 | mem_device->state = MEMORY_POWER_ON_STATE; | |
417 | ||
6cbe44cd | 418 | printk(KERN_DEBUG "%s \n", acpi_device_name(device)); |
1da177e4 | 419 | |
d550d98d | 420 | return result; |
1da177e4 LT |
421 | } |
422 | ||
4be44fcd | 423 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
1da177e4 LT |
424 | { |
425 | struct acpi_memory_device *mem_device = NULL; | |
426 | ||
1da177e4 LT |
427 | |
428 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 429 | return -EINVAL; |
1da177e4 | 430 | |
50dd0969 | 431 | mem_device = acpi_driver_data(device); |
1da177e4 LT |
432 | kfree(mem_device); |
433 | ||
d550d98d | 434 | return 0; |
1da177e4 LT |
435 | } |
436 | ||
1f425994 YG |
437 | static int acpi_memory_device_start (struct acpi_device *device) |
438 | { | |
439 | struct acpi_memory_device *mem_device; | |
440 | int result = 0; | |
441 | ||
887b9593 YG |
442 | /* |
443 | * Early boot code has recognized memory area by EFI/E820. | |
444 | * If DSDT shows these memory devices on boot, hotplug is not necessary | |
445 | * for them. So, it just returns until completion of this driver's | |
446 | * start up. | |
447 | */ | |
448 | if (!acpi_hotmem_initialized) | |
449 | return 0; | |
450 | ||
1f425994 YG |
451 | mem_device = acpi_driver_data(device); |
452 | ||
453 | if (!acpi_memory_check_device(mem_device)) { | |
454 | /* call add_memory func */ | |
455 | result = acpi_memory_enable_device(mem_device); | |
456 | if (result) | |
457 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
458 | "Error in acpi_memory_enable_device\n")); | |
459 | } | |
d120cfb5 | 460 | return result; |
1f425994 YG |
461 | } |
462 | ||
1da177e4 LT |
463 | /* |
464 | * Helper function to check for memory device | |
465 | */ | |
4be44fcd | 466 | static acpi_status is_memory_device(acpi_handle handle) |
1da177e4 LT |
467 | { |
468 | char *hardware_id; | |
469 | acpi_status status; | |
4be44fcd | 470 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 LT |
471 | struct acpi_device_info *info; |
472 | ||
1da177e4 LT |
473 | |
474 | status = acpi_get_object_info(handle, &buffer); | |
475 | if (ACPI_FAILURE(status)) | |
d550d98d | 476 | return status; |
1da177e4 LT |
477 | |
478 | info = buffer.pointer; | |
479 | if (!(info->valid & ACPI_VALID_HID)) { | |
02438d87 | 480 | kfree(buffer.pointer); |
d550d98d | 481 | return AE_ERROR; |
1da177e4 LT |
482 | } |
483 | ||
484 | hardware_id = info->hardware_id.value; | |
485 | if ((hardware_id == NULL) || | |
4be44fcd | 486 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
1da177e4 LT |
487 | status = AE_ERROR; |
488 | ||
02438d87 | 489 | kfree(buffer.pointer); |
d550d98d | 490 | return status; |
1da177e4 LT |
491 | } |
492 | ||
493 | static acpi_status | |
4be44fcd LB |
494 | acpi_memory_register_notify_handler(acpi_handle handle, |
495 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
496 | { |
497 | acpi_status status; | |
498 | ||
1da177e4 LT |
499 | |
500 | status = is_memory_device(handle); | |
07dd4855 | 501 | if (ACPI_FAILURE(status)) |
d550d98d | 502 | return AE_OK; /* continue */ |
1da177e4 LT |
503 | |
504 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
4be44fcd | 505 | acpi_memory_device_notify, NULL); |
a6fc6720 | 506 | /* continue */ |
d550d98d | 507 | return AE_OK; |
1da177e4 LT |
508 | } |
509 | ||
510 | static acpi_status | |
4be44fcd LB |
511 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
512 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
513 | { |
514 | acpi_status status; | |
515 | ||
1da177e4 LT |
516 | |
517 | status = is_memory_device(handle); | |
07dd4855 | 518 | if (ACPI_FAILURE(status)) |
d550d98d | 519 | return AE_OK; /* continue */ |
1da177e4 LT |
520 | |
521 | status = acpi_remove_notify_handler(handle, | |
4be44fcd LB |
522 | ACPI_SYSTEM_NOTIFY, |
523 | acpi_memory_device_notify); | |
1da177e4 | 524 | |
d550d98d | 525 | return AE_OK; /* continue */ |
1da177e4 LT |
526 | } |
527 | ||
4be44fcd | 528 | static int __init acpi_memory_device_init(void) |
1da177e4 LT |
529 | { |
530 | int result; | |
531 | acpi_status status; | |
532 | ||
1da177e4 LT |
533 | |
534 | result = acpi_bus_register_driver(&acpi_memory_device_driver); | |
535 | ||
536 | if (result < 0) | |
d550d98d | 537 | return -ENODEV; |
1da177e4 LT |
538 | |
539 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
540 | ACPI_UINT32_MAX, |
541 | acpi_memory_register_notify_handler, | |
542 | NULL, NULL); | |
1da177e4 | 543 | |
4be44fcd | 544 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 545 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 | 546 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
d550d98d | 547 | return -ENODEV; |
4be44fcd | 548 | } |
1da177e4 | 549 | |
887b9593 | 550 | acpi_hotmem_initialized = 1; |
d550d98d | 551 | return 0; |
1da177e4 LT |
552 | } |
553 | ||
4be44fcd | 554 | static void __exit acpi_memory_device_exit(void) |
1da177e4 LT |
555 | { |
556 | acpi_status status; | |
557 | ||
1da177e4 LT |
558 | |
559 | /* | |
560 | * Adding this to un-install notification handlers for all the device | |
561 | * handles. | |
562 | */ | |
563 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
564 | ACPI_UINT32_MAX, |
565 | acpi_memory_deregister_notify_handler, | |
566 | NULL, NULL); | |
1da177e4 | 567 | |
4be44fcd | 568 | if (ACPI_FAILURE(status)) |
a6fc6720 | 569 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 LT |
570 | |
571 | acpi_bus_unregister_driver(&acpi_memory_device_driver); | |
572 | ||
d550d98d | 573 | return; |
1da177e4 LT |
574 | } |
575 | ||
576 | module_init(acpi_memory_device_init); | |
577 | module_exit(acpi_memory_device_exit); |