acpi_memhotplug.c (e3900e74f26fc924c8e9e2a922bd40369b0bb517) acpi_memhotplug.c (0a34764411aaab0114aa3f3656fda33a69a46d10)
1/*
1/*
2 * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com>
2 * Copyright (C) 2004, 2013 Intel Corporation
3 * Author: Naveen B S <naveen.b.s@intel.com>
4 * Author: Rafael J. Wysocki <rafael.j.wysocki@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 *

--- 9 unchanged lines hidden (view full) ---

20 *
21 *
22 * ACPI based HotPlug driver that supports Memory Hotplug
23 * This driver fields notifications from firmware for memory add
24 * and remove operations and alerts the VM of the affected memory
25 * ranges.
26 */
27
5 *
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *

--- 9 unchanged lines hidden (view full) ---

22 *
23 *
24 * ACPI based HotPlug driver that supports Memory Hotplug
25 * This driver fields notifications from firmware for memory add
26 * and remove operations and alerts the VM of the affected memory
27 * ranges.
28 */
29
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 <linux/slab.h>
34#include <linux/acpi.h>
30#include <linux/acpi.h>
35#include <acpi/acpi_drivers.h>
31#include <linux/memory_hotplug.h>
36
32
33#include "internal.h"
34
37#define ACPI_MEMORY_DEVICE_CLASS "memory"
38#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
39#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
40
41#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
42
43#undef PREFIX
44#define PREFIX "ACPI:memory_hp:"
45
46ACPI_MODULE_NAME("acpi_memhotplug");
35#define ACPI_MEMORY_DEVICE_CLASS "memory"
36#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
37#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
38
39#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
40
41#undef PREFIX
42#define PREFIX "ACPI:memory_hp:"
43
44ACPI_MODULE_NAME("acpi_memhotplug");
47MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
48MODULE_DESCRIPTION("Hotplug Mem Driver");
49MODULE_LICENSE("GPL");
50
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
45
46/* Memory Device States */
47#define MEMORY_INVALID_STATE 0
48#define MEMORY_POWER_ON_STATE 1
49#define MEMORY_POWER_OFF_STATE 2
50
56static int acpi_memory_device_add(struct acpi_device *device);
57static int acpi_memory_device_remove(struct acpi_device *device, int type);
51static int acpi_memory_device_add(struct acpi_device *device,
52 const struct acpi_device_id *not_used);
53static void acpi_memory_device_remove(struct acpi_device *device);
58
59static const struct acpi_device_id memory_device_ids[] = {
60 {ACPI_MEMORY_DEVICE_HID, 0},
61 {"", 0},
62};
54
55static const struct acpi_device_id memory_device_ids[] = {
56 {ACPI_MEMORY_DEVICE_HID, 0},
57 {"", 0},
58};
63MODULE_DEVICE_TABLE(acpi, memory_device_ids);
64
59
65static struct acpi_driver acpi_memory_device_driver = {
66 .name = "acpi_memhotplug",
67 .class = ACPI_MEMORY_DEVICE_CLASS,
60static struct acpi_scan_handler memory_device_handler = {
68 .ids = memory_device_ids,
61 .ids = memory_device_ids,
69 .ops = {
70 .add = acpi_memory_device_add,
71 .remove = acpi_memory_device_remove,
72 },
62 .attach = acpi_memory_device_add,
63 .detach = acpi_memory_device_remove,
64 .hotplug = {
65 .enabled = true,
66 },
73};
74
75struct 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 */

--- 67 unchanged lines hidden (view full) ---

148 if (ACPI_FAILURE(status)) {
149 acpi_memory_free_device_resources(mem_device);
150 return -EINVAL;
151 }
152
153 return 0;
154}
155
67};
68
69struct acpi_memory_info {
70 struct list_head list;
71 u64 start_addr; /* Memory Range start physical addr */
72 u64 length; /* Memory Range length */
73 unsigned short caching; /* memory cache attribute */
74 unsigned short write_protect; /* memory read/write attribute */

--- 67 unchanged lines hidden (view full) ---

142 if (ACPI_FAILURE(status)) {
143 acpi_memory_free_device_resources(mem_device);
144 return -EINVAL;
145 }
146
147 return 0;
148}
149
156static int
157acpi_memory_get_device(acpi_handle handle,
158 struct acpi_memory_device **mem_device)
159{
160 acpi_status status;
161 acpi_handle phandle;
162 struct acpi_device *device = NULL;
163 struct acpi_device *pdevice = NULL;
164 int result;
165
166
167 if (!acpi_bus_get_device(handle, &device) && device)
168 goto end;
169
170 status = acpi_get_parent(handle, &phandle);
171 if (ACPI_FAILURE(status)) {
172 ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
173 return -EINVAL;
174 }
175
176 /* Get the parent device */
177 result = acpi_bus_get_device(phandle, &pdevice);
178 if (result) {
179 acpi_handle_warn(phandle, "Cannot get acpi bus device\n");
180 return -EINVAL;
181 }
182
183 /*
184 * Now add the notified device. This creates the acpi_device
185 * and invokes .add function
186 */
187 result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
188 if (result) {
189 acpi_handle_warn(handle, "Cannot add acpi bus\n");
190 return -EINVAL;
191 }
192
193 end:
194 *mem_device = acpi_driver_data(device);
195 if (!(*mem_device)) {
196 dev_err(&device->dev, "driver data not found\n");
197 return -ENODEV;
198 }
199
200 return 0;
201}
202
203static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
204{
205 unsigned long long current_status;
206
207 /* Get device present/absent information from the _STA */
208 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
209 NULL, &current_status)))
210 return -ENODEV;

--- 10 unchanged lines hidden (view full) ---

221}
222
223static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
224{
225 int result, num_enabled = 0;
226 struct acpi_memory_info *info;
227 int node;
228
150static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
151{
152 unsigned long long current_status;
153
154 /* Get device present/absent information from the _STA */
155 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
156 NULL, &current_status)))
157 return -ENODEV;

--- 10 unchanged lines hidden (view full) ---

168}
169
170static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
171{
172 int result, num_enabled = 0;
173 struct acpi_memory_info *info;
174 int node;
175
229
230 /* Get the range from the _CRS */
231 result = acpi_memory_get_device_resources(mem_device);
232 if (result) {
233 dev_err(&mem_device->device->dev,
234 "get_device_resources failed\n");
235 mem_device->state = MEMORY_INVALID_STATE;
236 return result;
237 }
238
239 node = acpi_get_node(mem_device->device->handle);
240 /*
241 * Tell the VM there is more memory here...
242 * Note: Assume that this function returns zero on success
243 * We don't have memory-hot-add rollback function,now.
244 * (i.e. memory-hot-remove function)
245 */
246 list_for_each_entry(info, &mem_device->res_list, list) {

--- 43 unchanged lines hidden (view full) ---

290 * memory, it will be failure and the memory device can't be bound with
291 * driver.
292 */
293 return 0;
294}
295
296static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
297{
176 node = acpi_get_node(mem_device->device->handle);
177 /*
178 * Tell the VM there is more memory here...
179 * Note: Assume that this function returns zero on success
180 * We don't have memory-hot-add rollback function,now.
181 * (i.e. memory-hot-remove function)
182 */
183 list_for_each_entry(info, &mem_device->res_list, list) {

--- 43 unchanged lines hidden (view full) ---

227 * memory, it will be failure and the memory device can't be bound with
228 * driver.
229 */
230 return 0;
231}
232
233static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
234{
298 int result = 0;
235 int result = 0, nid;
299 struct acpi_memory_info *info, *n;
300
236 struct acpi_memory_info *info, *n;
237
238 nid = acpi_get_node(mem_device->device->handle);
239
301 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
302 if (info->failed)
303 /* The kernel does not use this memory block */
304 continue;
305
306 if (!info->enabled)
307 /*
308 * The kernel uses this memory block, but it may be not
309 * managed by us.
310 */
311 return -EBUSY;
312
240 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
241 if (info->failed)
242 /* The kernel does not use this memory block */
243 continue;
244
245 if (!info->enabled)
246 /*
247 * The kernel uses this memory block, but it may be not
248 * managed by us.
249 */
250 return -EBUSY;
251
313 result = remove_memory(info->start_addr, info->length);
252 if (nid < 0)
253 nid = memory_add_physaddr_to_nid(info->start_addr);
254 result = remove_memory(nid, info->start_addr, info->length);
314 if (result)
315 return result;
316
317 list_del(&info->list);
318 kfree(info);
319 }
320
321 return result;
322}
323
255 if (result)
256 return result;
257
258 list_del(&info->list);
259 kfree(info);
260 }
261
262 return result;
263}
264
324static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
325{
326 struct acpi_memory_device *mem_device;
327 struct acpi_device *device;
328 struct acpi_eject_event *ej_event = NULL;
329 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
330
331 switch (event) {
332 case ACPI_NOTIFY_BUS_CHECK:
333 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
334 "\nReceived BUS CHECK notification for device\n"));
335 /* Fall Through */
336 case ACPI_NOTIFY_DEVICE_CHECK:
337 if (event == ACPI_NOTIFY_DEVICE_CHECK)
338 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
339 "\nReceived DEVICE CHECK notification for device\n"));
340 if (acpi_memory_get_device(handle, &mem_device)) {
341 acpi_handle_err(handle, "Cannot find driver data\n");
342 break;
343 }
344
345 if (acpi_memory_check_device(mem_device))
346 break;
347
348 if (acpi_memory_enable_device(mem_device)) {
349 acpi_handle_err(handle,"Cannot enable memory device\n");
350 break;
351 }
352
353 ost_code = ACPI_OST_SC_SUCCESS;
354 break;
355
356 case ACPI_NOTIFY_EJECT_REQUEST:
357 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
358 "\nReceived EJECT REQUEST notification for device\n"));
359
360 if (acpi_bus_get_device(handle, &device)) {
361 acpi_handle_err(handle, "Device doesn't exist\n");
362 break;
363 }
364 mem_device = acpi_driver_data(device);
365 if (!mem_device) {
366 acpi_handle_err(handle, "Driver Data is NULL\n");
367 break;
368 }
369
370 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
371 if (!ej_event) {
372 pr_err(PREFIX "No memory, dropping EJECT\n");
373 break;
374 }
375
376 ej_event->handle = handle;
377 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
378 acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
379 (void *)ej_event);
380
381 /* eject is performed asynchronously */
382 return;
383 default:
384 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
385 "Unsupported event [0x%x]\n", event));
386
387 /* non-hotplug event; possibly handled by other handler */
388 return;
389 }
390
391 /* Inform firmware that the hotplug operation has completed */
392 (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
393 return;
394}
395
396static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
397{
398 if (!mem_device)
399 return;
400
401 acpi_memory_free_device_resources(mem_device);
265static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
266{
267 if (!mem_device)
268 return;
269
270 acpi_memory_free_device_resources(mem_device);
271 mem_device->device->driver_data = NULL;
402 kfree(mem_device);
403}
404
272 kfree(mem_device);
273}
274
405static int acpi_memory_device_add(struct acpi_device *device)
275static int acpi_memory_device_add(struct acpi_device *device,
276 const struct acpi_device_id *not_used)
406{
277{
278 struct acpi_memory_device *mem_device;
407 int result;
279 int result;
408 struct acpi_memory_device *mem_device = NULL;
409
280
410
411 if (!device)
412 return -EINVAL;
413
414 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
415 if (!mem_device)
416 return -ENOMEM;
417
418 INIT_LIST_HEAD(&mem_device->res_list);

--- 7 unchanged lines hidden (view full) ---

426 if (result) {
427 kfree(mem_device);
428 return result;
429 }
430
431 /* Set the device state */
432 mem_device->state = MEMORY_POWER_ON_STATE;
433
281 if (!device)
282 return -EINVAL;
283
284 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
285 if (!mem_device)
286 return -ENOMEM;
287
288 INIT_LIST_HEAD(&mem_device->res_list);

--- 7 unchanged lines hidden (view full) ---

296 if (result) {
297 kfree(mem_device);
298 return result;
299 }
300
301 /* Set the device state */
302 mem_device->state = MEMORY_POWER_ON_STATE;
303
434 pr_debug("%s\n", acpi_device_name(device));
304 result = acpi_memory_check_device(mem_device);
305 if (result) {
306 acpi_memory_device_free(mem_device);
307 return 0;
308 }
435
309
436 if (!acpi_memory_check_device(mem_device)) {
437 /* call add_memory func */
438 result = acpi_memory_enable_device(mem_device);
439 if (result) {
440 dev_err(&device->dev,
441 "Error in acpi_memory_enable_device\n");
442 acpi_memory_device_free(mem_device);
443 }
310 result = acpi_memory_enable_device(mem_device);
311 if (result) {
312 dev_err(&device->dev, "acpi_memory_enable_device() error\n");
313 acpi_memory_device_free(mem_device);
314 return -ENODEV;
444 }
315 }
445 return result;
316
317 dev_dbg(&device->dev, "Memory device configured by ACPI\n");
318 return 1;
446}
447
319}
320
448static int acpi_memory_device_remove(struct acpi_device *device, int type)
321static void acpi_memory_device_remove(struct acpi_device *device)
449{
322{
450 struct acpi_memory_device *mem_device = NULL;
451 int result;
323 struct acpi_memory_device *mem_device;
452
453 if (!device || !acpi_driver_data(device))
324
325 if (!device || !acpi_driver_data(device))
454 return -EINVAL;
326 return;
455
456 mem_device = acpi_driver_data(device);
327
328 mem_device = acpi_driver_data(device);
457
458 result = acpi_memory_remove_memory(mem_device);
459 if (result)
460 return result;
461
329 acpi_memory_remove_memory(mem_device);
462 acpi_memory_device_free(mem_device);
330 acpi_memory_device_free(mem_device);
463
464 return 0;
465}
466
331}
332
467/*
468 * Helper function to check for memory device
469 */
470static acpi_status is_memory_device(acpi_handle handle)
333void __init acpi_memory_hotplug_init(void)
471{
334{
472 char *hardware_id;
473 acpi_status status;
474 struct acpi_device_info *info;
475
476 status = acpi_get_object_info(handle, &info);
477 if (ACPI_FAILURE(status))
478 return status;
479
480 if (!(info->valid & ACPI_VALID_HID)) {
481 kfree(info);
482 return AE_ERROR;
483 }
484
485 hardware_id = info->hardware_id.string;
486 if ((hardware_id == NULL) ||
487 (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
488 status = AE_ERROR;
489
490 kfree(info);
491 return status;
335 acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
492}
336}
493
494static acpi_status
495acpi_memory_register_notify_handler(acpi_handle handle,
496 u32 level, void *ctxt, void **retv)
497{
498 acpi_status status;
499
500
501 status = is_memory_device(handle);
502 if (ACPI_FAILURE(status))
503 return AE_OK; /* continue */
504
505 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
506 acpi_memory_device_notify, NULL);
507 /* continue */
508 return AE_OK;
509}
510
511static acpi_status
512acpi_memory_deregister_notify_handler(acpi_handle handle,
513 u32 level, void *ctxt, void **retv)
514{
515 acpi_status status;
516
517
518 status = is_memory_device(handle);
519 if (ACPI_FAILURE(status))
520 return AE_OK; /* continue */
521
522 status = acpi_remove_notify_handler(handle,
523 ACPI_SYSTEM_NOTIFY,
524 acpi_memory_device_notify);
525
526 return AE_OK; /* continue */
527}
528
529static int __init acpi_memory_device_init(void)
530{
531 int result;
532 acpi_status status;
533
534
535 result = acpi_bus_register_driver(&acpi_memory_device_driver);
536
537 if (result < 0)
538 return -ENODEV;
539
540 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
541 ACPI_UINT32_MAX,
542 acpi_memory_register_notify_handler, NULL,
543 NULL, NULL);
544
545 if (ACPI_FAILURE(status)) {
546 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
547 acpi_bus_unregister_driver(&acpi_memory_device_driver);
548 return -ENODEV;
549 }
550
551 return 0;
552}
553
554static void __exit acpi_memory_device_exit(void)
555{
556 acpi_status status;
557
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,
564 ACPI_UINT32_MAX,
565 acpi_memory_deregister_notify_handler, NULL,
566 NULL, NULL);
567
568 if (ACPI_FAILURE(status))
569 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
570
571 acpi_bus_unregister_driver(&acpi_memory_device_driver);
572
573 return;
574}
575
576module_init(acpi_memory_device_init);
577module_exit(acpi_memory_device_exit);