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30#include <linux/acpi.h>
31#include <linux/memory.h>
32#include <linux/memory_hotplug.h>
33
34#include "internal.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");
46
47static const struct acpi_device_id memory_device_ids[] = {
48 {ACPI_MEMORY_DEVICE_HID, 0},
49 {"", 0},
50};
51
52#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
53
54
55#define MEMORY_INVALID_STATE 0
56#define MEMORY_POWER_ON_STATE 1
57#define MEMORY_POWER_OFF_STATE 2
58
59static int acpi_memory_device_add(struct acpi_device *device,
60 const struct acpi_device_id *not_used);
61static void acpi_memory_device_remove(struct acpi_device *device);
62
63static struct acpi_scan_handler memory_device_handler = {
64 .ids = memory_device_ids,
65 .attach = acpi_memory_device_add,
66 .detach = acpi_memory_device_remove,
67 .hotplug = {
68 .enabled = true,
69 },
70};
71
72struct acpi_memory_info {
73 struct list_head list;
74 u64 start_addr;
75 u64 length;
76 unsigned short caching;
77 unsigned short write_protect;
78 unsigned int enabled:1;
79};
80
81struct acpi_memory_device {
82 struct acpi_device * device;
83 unsigned int state;
84 struct list_head res_list;
85};
86
87static acpi_status
88acpi_memory_get_resource(struct acpi_resource *resource, void *context)
89{
90 struct acpi_memory_device *mem_device = context;
91 struct acpi_resource_address64 address64;
92 struct acpi_memory_info *info, *new;
93 acpi_status status;
94
95 status = acpi_resource_to_address64(resource, &address64);
96 if (ACPI_FAILURE(status) ||
97 (address64.resource_type != ACPI_MEMORY_RANGE))
98 return AE_OK;
99
100 list_for_each_entry(info, &mem_device->res_list, list) {
101
102 if ((info->caching == address64.info.mem.caching) &&
103 (info->write_protect == address64.info.mem.write_protect) &&
104 (info->start_addr + info->length == address64.minimum)) {
105 info->length += address64.address_length;
106 return AE_OK;
107 }
108 }
109
110 new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
111 if (!new)
112 return AE_ERROR;
113
114 INIT_LIST_HEAD(&new->list);
115 new->caching = address64.info.mem.caching;
116 new->write_protect = address64.info.mem.write_protect;
117 new->start_addr = address64.minimum;
118 new->length = address64.address_length;
119 list_add_tail(&new->list, &mem_device->res_list);
120
121 return AE_OK;
122}
123
124static void
125acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
126{
127 struct acpi_memory_info *info, *n;
128
129 list_for_each_entry_safe(info, n, &mem_device->res_list, list)
130 kfree(info);
131 INIT_LIST_HEAD(&mem_device->res_list);
132}
133
134static int
135acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
136{
137 acpi_status status;
138
139 if (!list_empty(&mem_device->res_list))
140 return 0;
141
142 status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
143 acpi_memory_get_resource, mem_device);
144 if (ACPI_FAILURE(status)) {
145 acpi_memory_free_device_resources(mem_device);
146 return -EINVAL;
147 }
148
149 return 0;
150}
151
152static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
153{
154 unsigned long long current_status;
155
156
157 if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
158 METHOD_NAME__STA, NULL,
159 ¤t_status)))
160 return -ENODEV;
161
162
163
164
165 if (!((current_status & ACPI_STA_DEVICE_PRESENT)
166 && (current_status & ACPI_STA_DEVICE_ENABLED)
167 && (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
168 return -ENODEV;
169
170 return 0;
171}
172
173static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
174{
175 return PFN_DOWN(info->start_addr);
176}
177
178static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
179{
180 return PFN_UP(info->start_addr + info->length-1);
181}
182
183static int acpi_bind_memblk(struct memory_block *mem, void *arg)
184{
185 return acpi_bind_one(&mem->dev, arg);
186}
187
188static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
189 struct acpi_device *adev)
190{
191 return walk_memory_range(acpi_meminfo_start_pfn(info),
192 acpi_meminfo_end_pfn(info), adev,
193 acpi_bind_memblk);
194}
195
196static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
197{
198 acpi_unbind_one(&mem->dev);
199 return 0;
200}
201
202static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
203{
204 walk_memory_range(acpi_meminfo_start_pfn(info),
205 acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
206}
207
208static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
209{
210 acpi_handle handle = mem_device->device->handle;
211 int result, num_enabled = 0;
212 struct acpi_memory_info *info;
213 int node;
214
215 node = acpi_get_node(handle);
216
217
218
219
220
221
222 list_for_each_entry(info, &mem_device->res_list, list) {
223 if (info->enabled) {
224 num_enabled++;
225 continue;
226 }
227
228
229
230
231 if (!info->length)
232 continue;
233 if (node < 0)
234 node = memory_add_physaddr_to_nid(info->start_addr);
235
236 result = add_memory(node, info->start_addr, info->length);
237
238
239
240
241
242
243 if (result && result != -EEXIST)
244 continue;
245
246 result = acpi_bind_memory_blocks(info, mem_device->device);
247 if (result) {
248 acpi_unbind_memory_blocks(info);
249 return -ENODEV;
250 }
251
252 info->enabled = 1;
253
254
255
256
257
258 num_enabled++;
259 }
260 if (!num_enabled) {
261 dev_err(&mem_device->device->dev, "add_memory failed\n");
262 mem_device->state = MEMORY_INVALID_STATE;
263 return -EINVAL;
264 }
265
266
267
268
269
270
271
272
273 return 0;
274}
275
276static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
277{
278 acpi_handle handle = mem_device->device->handle;
279 struct acpi_memory_info *info, *n;
280 int nid = acpi_get_node(handle);
281
282 list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
283 if (!info->enabled)
284 continue;
285
286 if (nid == NUMA_NO_NODE)
287 nid = memory_add_physaddr_to_nid(info->start_addr);
288
289 acpi_unbind_memory_blocks(info);
290 remove_memory(nid, info->start_addr, info->length);
291 list_del(&info->list);
292 kfree(info);
293 }
294}
295
296static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
297{
298 if (!mem_device)
299 return;
300
301 acpi_memory_free_device_resources(mem_device);
302 mem_device->device->driver_data = NULL;
303 kfree(mem_device);
304}
305
306static int acpi_memory_device_add(struct acpi_device *device,
307 const struct acpi_device_id *not_used)
308{
309 struct acpi_memory_device *mem_device;
310 int result;
311
312 if (!device)
313 return -EINVAL;
314
315 mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
316 if (!mem_device)
317 return -ENOMEM;
318
319 INIT_LIST_HEAD(&mem_device->res_list);
320 mem_device->device = device;
321 sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
322 sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
323 device->driver_data = mem_device;
324
325
326 result = acpi_memory_get_device_resources(mem_device);
327 if (result) {
328 device->driver_data = NULL;
329 kfree(mem_device);
330 return result;
331 }
332
333
334 mem_device->state = MEMORY_POWER_ON_STATE;
335
336 result = acpi_memory_check_device(mem_device);
337 if (result) {
338 acpi_memory_device_free(mem_device);
339 return 0;
340 }
341
342 result = acpi_memory_enable_device(mem_device);
343 if (result) {
344 dev_err(&device->dev, "acpi_memory_enable_device() error\n");
345 acpi_memory_device_free(mem_device);
346 return result;
347 }
348
349 dev_dbg(&device->dev, "Memory device configured by ACPI\n");
350 return 1;
351}
352
353static void acpi_memory_device_remove(struct acpi_device *device)
354{
355 struct acpi_memory_device *mem_device;
356
357 if (!device || !acpi_driver_data(device))
358 return;
359
360 mem_device = acpi_driver_data(device);
361 acpi_memory_remove_memory(mem_device);
362 acpi_memory_device_free(mem_device);
363}
364
365static bool __initdata acpi_no_memhotplug;
366
367void __init acpi_memory_hotplug_init(void)
368{
369 if (acpi_no_memhotplug) {
370 memory_device_handler.attach = NULL;
371 acpi_scan_add_handler(&memory_device_handler);
372 return;
373 }
374 acpi_scan_add_handler_with_hotplug(&memory_device_handler, "memory");
375}
376
377static int __init disable_acpi_memory_hotplug(char *str)
378{
379 acpi_no_memhotplug = true;
380 return 1;
381}
382__setup("acpi_no_memhotplug", disable_acpi_memory_hotplug);
383
384#else
385
386static struct acpi_scan_handler memory_device_handler = {
387 .ids = memory_device_ids,
388};
389
390void __init acpi_memory_hotplug_init(void)
391{
392 acpi_scan_add_handler(&memory_device_handler);
393}
394
395#endif
396