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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 firmware 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 <linux/slab.h>
34#include <acpi/acpi_drivers.h>
35
36#define ACPI_MEMORY_DEVICE_CLASS "memory"
37#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
38#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
39
40#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
41
42#undef PREFIX
43#define PREFIX "ACPI:memory_hp:"
44
45ACPI_MODULE_NAME("acpi_memhotplug");
46MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>");
47MODULE_DESCRIPTION("Hotplug Mem Driver");
48MODULE_LICENSE("GPL");
49
50/* Memory Device States */
51#define MEMORY_INVALID_STATE 0
52#define MEMORY_POWER_ON_STATE 1
53#define MEMORY_POWER_OFF_STATE 2
54
55static int acpi_memory_device_add(struct acpi_device *device);
56static int acpi_memory_device_remove(struct acpi_device *device, int type);
57
58static const struct acpi_device_id memory_device_ids[] = {
59 {ACPI_MEMORY_DEVICE_HID, 0},
60 {"", 0},
61};
62MODULE_DEVICE_TABLE(acpi, memory_device_ids);
63
64static struct acpi_driver acpi_memory_device_driver = {
65 .name = "acpi_memhotplug",
66 .class = ACPI_MEMORY_DEVICE_CLASS,
67 .ids = memory_device_ids,
68 .ops = {
69 .add = acpi_memory_device_add,
70 .remove = acpi_memory_device_remove,
71 },
72};
73
74struct acpi_memory_info {
75 struct list_head list;
76 u64 start_addr; /* Memory Range start physical addr */
77 u64 length; /* Memory Range length */
78 unsigned short caching; /* memory cache attribute */
79 unsigned short write_protect; /* memory read/write attribute */
80 unsigned int enabled:1;
81};
82
83struct acpi_memory_device {
84 struct acpi_device * device;
85 unsigned int state; /* State of the memory device */
86 struct list_head res_list;
87};
88
89static int acpi_hotmem_initialized;
90
91static acpi_status
92acpi_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
128static int
129acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
130{
131 acpi_status status;
132 struct acpi_memory_info *info, *n;
133
134
135 if (!list_empty(&mem_device->res_list))
136 return 0;
137
138 status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
139 acpi_memory_get_resource, mem_device);
140 if (ACPI_FAILURE(status)) {
141 list_for_each_entry_safe(info, n, &mem_device->res_list, list)
142 kfree(info);
143 INIT_LIST_HEAD(&mem_device->res_list);
144 return -EINVAL;
145 }
146
147 return 0;
148}
149
150static int
151acpi_memory_get_device(acpi_handle handle,
152 struct acpi_memory_device **mem_device)
153{
154 acpi_status status;
155 acpi_handle phandle;
156 struct acpi_device *device = NULL;
157 struct acpi_device *pdevice = NULL;
158 int result;
159
160
161 if (!acpi_bus_get_device(handle, &device) && device)
162 goto end;
163
164 status = acpi_get_parent(handle, &phandle);
165 if (ACPI_FAILURE(status)) {
166 ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
167 return -EINVAL;
168 }
169
170 /* Get the parent device */
171 result = acpi_bus_get_device(phandle, &pdevice);
172 if (result) {
173 printk(KERN_WARNING PREFIX "Cannot get acpi bus device");
174 return -EINVAL;
175 }
176
177 /*
178 * Now add the notified device. This creates the acpi_device
179 * and invokes .add function
180 */
181 result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
182 if (result) {
183 printk(KERN_WARNING PREFIX "Cannot add acpi bus");
184 return -EINVAL;
185 }
186
187 end:
188 *mem_device = acpi_driver_data(device);
189 if (!(*mem_device)) {
190 printk(KERN_ERR "\n driver data not found");
191 return -ENODEV;
192 }
193
194 return 0;
195}
196
197static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
198{
199 unsigned long long current_status;
200
201 /* Get device present/absent information from the _STA */
202 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA",
203 NULL, ¤t_status)))
204 return -ENODEV;
205 /*
206 * Check for device status. Device should be
207 * present/enabled/functioning.
208 */
209 if (!((current_status & ACPI_STA_DEVICE_PRESENT)
210 && (current_status & ACPI_STA_DEVICE_ENABLED)
211 && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
212 return -ENODEV;
213
214 return 0;
215}
216
217static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
218{
219 int result, num_enabled = 0;
220 struct acpi_memory_info *info;
221 int node;
222
223
224 /* Get the range from the _CRS */
225 result = acpi_memory_get_device_resources(mem_device);
226 if (result) {
227 printk(KERN_ERR PREFIX "get_device_resources failed\n");
228 mem_device->state = MEMORY_INVALID_STATE;
229 return result;
230 }
231
232 node = acpi_get_node(mem_device->device->handle);
233 /*
234 * Tell the VM there is more memory here...
235 * Note: Assume that this function returns zero on success
236 * We don't have memory-hot-add rollback function,now.
237 * (i.e. memory-hot-remove function)
238 */
239 list_for_each_entry(info, &mem_device->res_list, list) {
240 if (info->enabled) { /* just sanity check...*/
241 num_enabled++;
242 continue;
243 }
244 /*
245 * If the memory block size is zero, please ignore it.
246 * Don't try to do the following memory hotplug flowchart.
247 */
248 if (!info->length)
249 continue;
250 if (node < 0)
251 node = memory_add_physaddr_to_nid(info->start_addr);
252
253 result = add_memory(node, info->start_addr, info->length);
254 if (result)
255 continue;
256 info->enabled = 1;
257 num_enabled++;
258 }
259 if (!num_enabled) {
260 printk(KERN_ERR PREFIX "add_memory failed\n");
261 mem_device->state = MEMORY_INVALID_STATE;
262 return -EINVAL;
263 }
264 /*
265 * Sometimes the memory device will contain several memory blocks.
266 * When one memory block is hot-added to the system memory, it will
267 * be regarded as a success.
268 * Otherwise if the last memory block can't be hot-added to the system
269 * memory, it will be failure and the memory device can't be bound with
270 * driver.
271 */
272 return 0;
273}
274
275static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
276{
277 acpi_status status;
278 struct acpi_object_list arg_list;
279 union acpi_object arg;
280 unsigned long long current_status;
281
282
283 /* Issue the _EJ0 command */
284 arg_list.count = 1;
285 arg_list.pointer = &arg;
286 arg.type = ACPI_TYPE_INTEGER;
287 arg.integer.value = 1;
288 status = acpi_evaluate_object(mem_device->device->handle,
289 "_EJ0", &arg_list, NULL);
290 /* Return on _EJ0 failure */
291 if (ACPI_FAILURE(status)) {
292 ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
293 return -ENODEV;
294 }
295
296 /* Evalute _STA to check if the device is disabled */
297 status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
298 NULL, ¤t_status);
299 if (ACPI_FAILURE(status))
300 return -ENODEV;
301
302 /* Check for device status. Device should be disabled */
303 if (current_status & ACPI_STA_DEVICE_ENABLED)
304 return -EINVAL;
305
306 return 0;
307}
308
309static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
310{
311 int result;
312 struct acpi_memory_info *info, *n;
313
314
315 /*
316 * Ask the VM to offline this memory range.
317 * Note: Assume that this function returns zero on success
318 */
319 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
320 if (info->enabled) {
321 result = remove_memory(info->start_addr, info->length);
322 if (result)
323 return result;
324 }
325 kfree(info);
326 }
327
328 /* Power-off and eject the device */
329 result = acpi_memory_powerdown_device(mem_device);
330 if (result) {
331 /* Set the status of the device to invalid */
332 mem_device->state = MEMORY_INVALID_STATE;
333 return result;
334 }
335
336 mem_device->state = MEMORY_POWER_OFF_STATE;
337 return result;
338}
339
340static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
341{
342 struct acpi_memory_device *mem_device;
343 struct acpi_device *device;
344
345
346 switch (event) {
347 case ACPI_NOTIFY_BUS_CHECK:
348 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
349 "\nReceived BUS CHECK notification for device\n"));
350 /* Fall Through */
351 case ACPI_NOTIFY_DEVICE_CHECK:
352 if (event == ACPI_NOTIFY_DEVICE_CHECK)
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
354 "\nReceived DEVICE CHECK notification for device\n"));
355 if (acpi_memory_get_device(handle, &mem_device)) {
356 printk(KERN_ERR PREFIX "Cannot find driver data\n");
357 return;
358 }
359
360 if (!acpi_memory_check_device(mem_device)) {
361 if (acpi_memory_enable_device(mem_device))
362 printk(KERN_ERR PREFIX
363 "Cannot enable memory device\n");
364 }
365 break;
366 case ACPI_NOTIFY_EJECT_REQUEST:
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
368 "\nReceived EJECT REQUEST notification for device\n"));
369
370 if (acpi_bus_get_device(handle, &device)) {
371 printk(KERN_ERR PREFIX "Device doesn't exist\n");
372 break;
373 }
374 mem_device = acpi_driver_data(device);
375 if (!mem_device) {
376 printk(KERN_ERR PREFIX "Driver Data is NULL\n");
377 break;
378 }
379
380 /*
381 * Currently disabling memory device from kernel mode
382 * TBD: Can also be disabled from user mode scripts
383 * TBD: Can also be disabled by Callback registration
384 * with generic sysfs driver
385 */
386 if (acpi_memory_disable_device(mem_device))
387 printk(KERN_ERR PREFIX
388 "Disable memory device\n");
389 /*
390 * TBD: Invoke acpi_bus_remove to cleanup data structures
391 */
392 break;
393 default:
394 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
395 "Unsupported event [0x%x]\n", event));
396 break;
397 }
398
399 return;
400}
401
402static int acpi_memory_device_add(struct acpi_device *device)
403{
404 int result;
405 struct acpi_memory_device *mem_device = NULL;
406
407
408 if (!device)
409 return -EINVAL;
410
411 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
412 if (!mem_device)
413 return -ENOMEM;
414
415 INIT_LIST_HEAD(&mem_device->res_list);
416 mem_device->device = device;
417 sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
418 sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
419 device->driver_data = mem_device;
420
421 /* Get the range from the _CRS */
422 result = acpi_memory_get_device_resources(mem_device);
423 if (result) {
424 kfree(mem_device);
425 return result;
426 }
427
428 /* Set the device state */
429 mem_device->state = MEMORY_POWER_ON_STATE;
430
431 printk(KERN_DEBUG "%s \n", acpi_device_name(device));
432
433 /*
434 * Early boot code has recognized memory area by EFI/E820.
435 * If DSDT shows these memory devices on boot, hotplug is not necessary
436 * for them. So, it just returns until completion of this driver's
437 * start up.
438 */
439 if (!acpi_hotmem_initialized)
440 return 0;
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 printk(KERN_ERR PREFIX
447 "Error in acpi_memory_enable_device\n");
448 }
449 return result;
450}
451
452static int acpi_memory_device_remove(struct acpi_device *device, int type)
453{
454 struct acpi_memory_device *mem_device = NULL;
455
456
457 if (!device || !acpi_driver_data(device))
458 return -EINVAL;
459
460 mem_device = acpi_driver_data(device);
461 kfree(mem_device);
462
463 return 0;
464}
465
466/*
467 * Helper function to check for memory device
468 */
469static acpi_status is_memory_device(acpi_handle handle)
470{
471 char *hardware_id;
472 acpi_status status;
473 struct acpi_device_info *info;
474
475 status = acpi_get_object_info(handle, &info);
476 if (ACPI_FAILURE(status))
477 return status;
478
479 if (!(info->valid & ACPI_VALID_HID)) {
480 kfree(info);
481 return AE_ERROR;
482 }
483
484 hardware_id = info->hardware_id.string;
485 if ((hardware_id == NULL) ||
486 (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
487 status = AE_ERROR;
488
489 kfree(info);
490 return status;
491}
492
493static acpi_status
494acpi_memory_register_notify_handler(acpi_handle handle,
495 u32 level, void *ctxt, void **retv)
496{
497 acpi_status status;
498
499
500 status = is_memory_device(handle);
501 if (ACPI_FAILURE(status))
502 return AE_OK; /* continue */
503
504 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
505 acpi_memory_device_notify, NULL);
506 /* continue */
507 return AE_OK;
508}
509
510static acpi_status
511acpi_memory_deregister_notify_handler(acpi_handle handle,
512 u32 level, void *ctxt, void **retv)
513{
514 acpi_status status;
515
516
517 status = is_memory_device(handle);
518 if (ACPI_FAILURE(status))
519 return AE_OK; /* continue */
520
521 status = acpi_remove_notify_handler(handle,
522 ACPI_SYSTEM_NOTIFY,
523 acpi_memory_device_notify);
524
525 return AE_OK; /* continue */
526}
527
528static int __init acpi_memory_device_init(void)
529{
530 int result;
531 acpi_status status;
532
533
534 result = acpi_bus_register_driver(&acpi_memory_device_driver);
535
536 if (result < 0)
537 return -ENODEV;
538
539 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
540 ACPI_UINT32_MAX,
541 acpi_memory_register_notify_handler, NULL,
542 NULL, NULL);
543
544 if (ACPI_FAILURE(status)) {
545 ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed"));
546 acpi_bus_unregister_driver(&acpi_memory_device_driver);
547 return -ENODEV;
548 }
549
550 acpi_hotmem_initialized = 1;
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);
1/*
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>
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 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT. See the GNU General Public License for more
17 * details.
18 *
19 * ACPI based HotPlug driver that supports Memory Hotplug
20 * This driver fields notifications from firmware for memory add
21 * and remove operations and alerts the VM of the affected memory
22 * ranges.
23 */
24
25#include <linux/acpi.h>
26#include <linux/memory.h>
27#include <linux/memory_hotplug.h>
28
29#include "internal.h"
30
31#define ACPI_MEMORY_DEVICE_CLASS "memory"
32#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
33#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
34
35#define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT
36
37#undef PREFIX
38#define PREFIX "ACPI:memory_hp:"
39
40ACPI_MODULE_NAME("acpi_memhotplug");
41
42static const struct acpi_device_id memory_device_ids[] = {
43 {ACPI_MEMORY_DEVICE_HID, 0},
44 {"", 0},
45};
46
47#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
48
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
54static int acpi_memory_device_add(struct acpi_device *device,
55 const struct acpi_device_id *not_used);
56static void acpi_memory_device_remove(struct acpi_device *device);
57
58static struct acpi_scan_handler memory_device_handler = {
59 .ids = memory_device_ids,
60 .attach = acpi_memory_device_add,
61 .detach = acpi_memory_device_remove,
62 .hotplug = {
63 .enabled = true,
64 },
65};
66
67struct acpi_memory_info {
68 struct list_head list;
69 u64 start_addr; /* Memory Range start physical addr */
70 u64 length; /* Memory Range length */
71 unsigned short caching; /* memory cache attribute */
72 unsigned short write_protect; /* memory read/write attribute */
73 unsigned int enabled:1;
74};
75
76struct acpi_memory_device {
77 struct acpi_device * device;
78 unsigned int state; /* State of the memory device */
79 struct list_head res_list;
80};
81
82static acpi_status
83acpi_memory_get_resource(struct acpi_resource *resource, void *context)
84{
85 struct acpi_memory_device *mem_device = context;
86 struct acpi_resource_address64 address64;
87 struct acpi_memory_info *info, *new;
88 acpi_status status;
89
90 status = acpi_resource_to_address64(resource, &address64);
91 if (ACPI_FAILURE(status) ||
92 (address64.resource_type != ACPI_MEMORY_RANGE))
93 return AE_OK;
94
95 list_for_each_entry(info, &mem_device->res_list, list) {
96 /* Can we combine the resource range information? */
97 if ((info->caching == address64.info.mem.caching) &&
98 (info->write_protect == address64.info.mem.write_protect) &&
99 (info->start_addr + info->length == address64.address.minimum)) {
100 info->length += address64.address.address_length;
101 return AE_OK;
102 }
103 }
104
105 new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
106 if (!new)
107 return AE_ERROR;
108
109 INIT_LIST_HEAD(&new->list);
110 new->caching = address64.info.mem.caching;
111 new->write_protect = address64.info.mem.write_protect;
112 new->start_addr = address64.address.minimum;
113 new->length = address64.address.address_length;
114 list_add_tail(&new->list, &mem_device->res_list);
115
116 return AE_OK;
117}
118
119static void
120acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
121{
122 struct acpi_memory_info *info, *n;
123
124 list_for_each_entry_safe(info, n, &mem_device->res_list, list)
125 kfree(info);
126 INIT_LIST_HEAD(&mem_device->res_list);
127}
128
129static int
130acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
131{
132 acpi_status status;
133
134 if (!list_empty(&mem_device->res_list))
135 return 0;
136
137 status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
138 acpi_memory_get_resource, mem_device);
139 if (ACPI_FAILURE(status)) {
140 acpi_memory_free_device_resources(mem_device);
141 return -EINVAL;
142 }
143
144 return 0;
145}
146
147static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
148{
149 unsigned long long current_status;
150
151 /* Get device present/absent information from the _STA */
152 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
153 METHOD_NAME__STA, NULL,
154 ¤t_status)))
155 return -ENODEV;
156 /*
157 * Check for device status. Device should be
158 * present/enabled/functioning.
159 */
160 if (!((current_status & ACPI_STA_DEVICE_PRESENT)
161 && (current_status & ACPI_STA_DEVICE_ENABLED)
162 && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
163 return -ENODEV;
164
165 return 0;
166}
167
168static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
169{
170 return PFN_DOWN(info->start_addr);
171}
172
173static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
174{
175 return PFN_UP(info->start_addr + info->length-1);
176}
177
178static int acpi_bind_memblk(struct memory_block *mem, void *arg)
179{
180 return acpi_bind_one(&mem->dev, arg);
181}
182
183static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
184 struct acpi_device *adev)
185{
186 return walk_memory_range(acpi_meminfo_start_pfn(info),
187 acpi_meminfo_end_pfn(info), adev,
188 acpi_bind_memblk);
189}
190
191static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
192{
193 acpi_unbind_one(&mem->dev);
194 return 0;
195}
196
197static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
198{
199 walk_memory_range(acpi_meminfo_start_pfn(info),
200 acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
201}
202
203static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
204{
205 acpi_handle handle = mem_device->device->handle;
206 int result, num_enabled = 0;
207 struct acpi_memory_info *info;
208 int node;
209
210 node = acpi_get_node(handle);
211 /*
212 * Tell the VM there is more memory here...
213 * Note: Assume that this function returns zero on success
214 * We don't have memory-hot-add rollback function,now.
215 * (i.e. memory-hot-remove function)
216 */
217 list_for_each_entry(info, &mem_device->res_list, list) {
218 if (info->enabled) { /* just sanity check...*/
219 num_enabled++;
220 continue;
221 }
222 /*
223 * If the memory block size is zero, please ignore it.
224 * Don't try to do the following memory hotplug flowchart.
225 */
226 if (!info->length)
227 continue;
228 if (node < 0)
229 node = memory_add_physaddr_to_nid(info->start_addr);
230
231 result = add_memory(node, info->start_addr, info->length);
232
233 /*
234 * If the memory block has been used by the kernel, add_memory()
235 * returns -EEXIST. If add_memory() returns the other error, it
236 * means that this memory block is not used by the kernel.
237 */
238 if (result && result != -EEXIST)
239 continue;
240
241 result = acpi_bind_memory_blocks(info, mem_device->device);
242 if (result) {
243 acpi_unbind_memory_blocks(info);
244 return -ENODEV;
245 }
246
247 info->enabled = 1;
248
249 /*
250 * Add num_enable even if add_memory() returns -EEXIST, so the
251 * device is bound to this driver.
252 */
253 num_enabled++;
254 }
255 if (!num_enabled) {
256 dev_err(&mem_device->device->dev, "add_memory failed\n");
257 mem_device->state = MEMORY_INVALID_STATE;
258 return -EINVAL;
259 }
260 /*
261 * Sometimes the memory device will contain several memory blocks.
262 * When one memory block is hot-added to the system memory, it will
263 * be regarded as a success.
264 * Otherwise if the last memory block can't be hot-added to the system
265 * memory, it will be failure and the memory device can't be bound with
266 * driver.
267 */
268 return 0;
269}
270
271static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
272{
273 acpi_handle handle = mem_device->device->handle;
274 struct acpi_memory_info *info, *n;
275 int nid = acpi_get_node(handle);
276
277 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
278 if (!info->enabled)
279 continue;
280
281 if (nid == NUMA_NO_NODE)
282 nid = memory_add_physaddr_to_nid(info->start_addr);
283
284 acpi_unbind_memory_blocks(info);
285 remove_memory(nid, info->start_addr, info->length);
286 list_del(&info->list);
287 kfree(info);
288 }
289}
290
291static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
292{
293 if (!mem_device)
294 return;
295
296 acpi_memory_free_device_resources(mem_device);
297 mem_device->device->driver_data = NULL;
298 kfree(mem_device);
299}
300
301static int acpi_memory_device_add(struct acpi_device *device,
302 const struct acpi_device_id *not_used)
303{
304 struct acpi_memory_device *mem_device;
305 int result;
306
307 if (!device)
308 return -EINVAL;
309
310 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
311 if (!mem_device)
312 return -ENOMEM;
313
314 INIT_LIST_HEAD(&mem_device->res_list);
315 mem_device->device = device;
316 sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
317 sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
318 device->driver_data = mem_device;
319
320 /* Get the range from the _CRS */
321 result = acpi_memory_get_device_resources(mem_device);
322 if (result) {
323 device->driver_data = NULL;
324 kfree(mem_device);
325 return result;
326 }
327
328 /* Set the device state */
329 mem_device->state = MEMORY_POWER_ON_STATE;
330
331 result = acpi_memory_check_device(mem_device);
332 if (result) {
333 acpi_memory_device_free(mem_device);
334 return 0;
335 }
336
337 result = acpi_memory_enable_device(mem_device);
338 if (result) {
339 dev_err(&device->dev, "acpi_memory_enable_device() error\n");
340 acpi_memory_device_free(mem_device);
341 return result;
342 }
343
344 dev_dbg(&device->dev, "Memory device configured by ACPI\n");
345 return 1;
346}
347
348static void acpi_memory_device_remove(struct acpi_device *device)
349{
350 struct acpi_memory_device *mem_device;
351
352 if (!device || !acpi_driver_data(device))
353 return;
354
355 mem_device = acpi_driver_data(device);
356 acpi_memory_remove_memory(mem_device);
357 acpi_memory_device_free(mem_device);
358}
359
360static bool __initdata acpi_no_memhotplug;
361
362void __init acpi_memory_hotplug_init(void)
363{
364 if (acpi_no_memhotplug) {
365 memory_device_handler.attach = NULL;
366 acpi_scan_add_handler(&memory_device_handler);
367 return;
368 }
369 acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
370}
371
372static int __init disable_acpi_memory_hotplug(char *str)
373{
374 acpi_no_memhotplug = true;
375 return 1;
376}
377__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
378
379#else
380
381static struct acpi_scan_handler memory_device_handler = {
382 .ids = memory_device_ids,
383};
384
385void __init acpi_memory_hotplug_init(void)
386{
387 acpi_scan_add_handler(&memory_device_handler);
388}
389
390#endif /* CONFIG_ACPI_HOTPLUG_MEMORY */