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