Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * acpi_numa.c - ACPI NUMA support | |
4 | * | |
5 | * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> | |
1da177e4 | 6 | */ |
ac906a6d HG |
7 | |
8 | #define pr_fmt(fmt) "ACPI: " fmt | |
9 | ||
1da177e4 | 10 | #include <linux/module.h> |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/acpi.h> | |
3770442e | 16 | #include <linux/memblock.h> |
b552a8c5 | 17 | #include <linux/numa.h> |
99759869 TK |
18 | #include <linux/nodemask.h> |
19 | #include <linux/topology.h> | |
1da177e4 | 20 | |
762834e8 | 21 | static nodemask_t nodes_found_map = NODE_MASK_NONE; |
762834e8 YG |
22 | |
23 | /* maps to convert between proximity domain and logical node ID */ | |
ffada891 | 24 | static int pxm_to_node_map[MAX_PXM_DOMAINS] |
b552a8c5 | 25 | = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; |
ffada891 | 26 | static int node_to_pxm_map[MAX_NUMNODES] |
b552a8c5 | 27 | = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; |
762834e8 | 28 | |
8df0eb7c | 29 | unsigned char acpi_srat_revision __initdata; |
e84025e2 | 30 | int acpi_numa __initdata; |
8df0eb7c | 31 | |
f363d16f | 32 | int pxm_to_node(int pxm) |
762834e8 YG |
33 | { |
34 | if (pxm < 0) | |
b552a8c5 | 35 | return NUMA_NO_NODE; |
762834e8 YG |
36 | return pxm_to_node_map[pxm]; |
37 | } | |
38 | ||
f363d16f | 39 | int node_to_pxm(int node) |
762834e8 YG |
40 | { |
41 | if (node < 0) | |
42 | return PXM_INVAL; | |
43 | return node_to_pxm_map[node]; | |
44 | } | |
45 | ||
d79ed248 | 46 | static void __acpi_map_pxm_to_node(int pxm, int node) |
3484d798 | 47 | { |
0f9b75ef DR |
48 | if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) |
49 | pxm_to_node_map[pxm] = node; | |
50 | if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) | |
51 | node_to_pxm_map[node] = pxm; | |
3484d798 DR |
52 | } |
53 | ||
8ff6f48d | 54 | int acpi_map_pxm_to_node(int pxm) |
762834e8 | 55 | { |
99759869 TK |
56 | int node; |
57 | ||
aec03f89 | 58 | if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) |
99759869 TK |
59 | return NUMA_NO_NODE; |
60 | ||
61 | node = pxm_to_node_map[pxm]; | |
762834e8 | 62 | |
1bb25df0 | 63 | if (node == NUMA_NO_NODE) { |
762834e8 | 64 | if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) |
b552a8c5 | 65 | return NUMA_NO_NODE; |
762834e8 | 66 | node = first_unset_node(nodes_found_map); |
3484d798 | 67 | __acpi_map_pxm_to_node(pxm, node); |
762834e8 YG |
68 | node_set(node, nodes_found_map); |
69 | } | |
70 | ||
71 | return node; | |
72 | } | |
8fc5c735 | 73 | EXPORT_SYMBOL(acpi_map_pxm_to_node); |
762834e8 | 74 | |
99759869 TK |
75 | /** |
76 | * acpi_map_pxm_to_online_node - Map proximity ID to online node | |
77 | * @pxm: ACPI proximity ID | |
78 | * | |
79 | * This is similar to acpi_map_pxm_to_node(), but always returns an online | |
80 | * node. When the mapped node from a given proximity ID is offline, it | |
81 | * looks up the node distance table and returns the nearest online node. | |
82 | * | |
83 | * ACPI device drivers, which are called after the NUMA initialization has | |
84 | * completed in the kernel, can call this interface to obtain their device | |
85 | * NUMA topology from ACPI tables. Such drivers do not have to deal with | |
86 | * offline nodes. A node may be offline when a device proximity ID is | |
87 | * unique, SRAT memory entry does not exist, or NUMA is disabled, ex. | |
88 | * "numa=off" on x86. | |
89 | */ | |
90 | int acpi_map_pxm_to_online_node(int pxm) | |
91 | { | |
dc9e0a93 | 92 | int node, min_node; |
99759869 TK |
93 | |
94 | node = acpi_map_pxm_to_node(pxm); | |
95 | ||
96 | if (node == NUMA_NO_NODE) | |
97 | node = 0; | |
98 | ||
dc9e0a93 | 99 | min_node = node; |
99759869 | 100 | if (!node_online(node)) { |
dc9e0a93 DW |
101 | int min_dist = INT_MAX, dist, n; |
102 | ||
99759869 TK |
103 | for_each_online_node(n) { |
104 | dist = node_distance(node, n); | |
105 | if (dist < min_dist) { | |
106 | min_dist = dist; | |
dc9e0a93 | 107 | min_node = n; |
99759869 TK |
108 | } |
109 | } | |
110 | } | |
111 | ||
dc9e0a93 | 112 | return min_node; |
99759869 TK |
113 | } |
114 | EXPORT_SYMBOL(acpi_map_pxm_to_online_node); | |
115 | ||
ae2c6dcf DR |
116 | static void __init |
117 | acpi_table_print_srat_entry(struct acpi_subtable_header *header) | |
1da177e4 | 118 | { |
1da177e4 | 119 | switch (header->type) { |
15a58ed1 | 120 | case ACPI_SRAT_TYPE_CPU_AFFINITY: |
4be44fcd | 121 | { |
15a58ed1 AS |
122 | struct acpi_srat_cpu_affinity *p = |
123 | (struct acpi_srat_cpu_affinity *)header; | |
3dda4481 HG |
124 | pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", |
125 | p->apic_id, p->local_sapic_eid, | |
126 | p->proximity_domain_lo, | |
127 | (p->flags & ACPI_SRAT_CPU_ENABLED) ? | |
128 | "enabled" : "disabled"); | |
4be44fcd | 129 | } |
1da177e4 LT |
130 | break; |
131 | ||
15a58ed1 | 132 | case ACPI_SRAT_TYPE_MEMORY_AFFINITY: |
4be44fcd | 133 | { |
15a58ed1 AS |
134 | struct acpi_srat_mem_affinity *p = |
135 | (struct acpi_srat_mem_affinity *)header; | |
b9ced18a CF |
136 | pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n", |
137 | (unsigned long long)p->base_address, | |
138 | (unsigned long long)p->length, | |
3dda4481 HG |
139 | p->proximity_domain, |
140 | (p->flags & ACPI_SRAT_MEM_ENABLED) ? | |
141 | "enabled" : "disabled", | |
142 | (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? | |
143 | " hot-pluggable" : "", | |
144 | (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? | |
145 | " non-volatile" : ""); | |
4be44fcd | 146 | } |
1da177e4 LT |
147 | break; |
148 | ||
7237d3de | 149 | case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: |
7237d3de SS |
150 | { |
151 | struct acpi_srat_x2apic_cpu_affinity *p = | |
152 | (struct acpi_srat_x2apic_cpu_affinity *)header; | |
3dda4481 HG |
153 | pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", |
154 | p->apic_id, | |
155 | p->proximity_domain, | |
156 | (p->flags & ACPI_SRAT_CPU_ENABLED) ? | |
157 | "enabled" : "disabled"); | |
7237d3de | 158 | } |
7237d3de | 159 | break; |
3dda4481 | 160 | |
4bac6fa7 HG |
161 | case ACPI_SRAT_TYPE_GICC_AFFINITY: |
162 | { | |
163 | struct acpi_srat_gicc_affinity *p = | |
164 | (struct acpi_srat_gicc_affinity *)header; | |
165 | pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", | |
166 | p->acpi_processor_uid, | |
167 | p->proximity_domain, | |
168 | (p->flags & ACPI_SRAT_GICC_ENABLED) ? | |
169 | "enabled" : "disabled"); | |
170 | } | |
171 | break; | |
172 | ||
1da177e4 | 173 | default: |
ac906a6d HG |
174 | pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", |
175 | header->type); | |
1da177e4 LT |
176 | break; |
177 | } | |
178 | } | |
179 | ||
39b8931b FY |
180 | /* |
181 | * A lot of BIOS fill in 10 (= no distance) everywhere. This messes | |
182 | * up the NUMA heuristics which wants the local node to have a smaller | |
183 | * distance than the others. | |
184 | * Do some quick checks here and only use the SLIT if it passes. | |
185 | */ | |
40e31856 | 186 | static int __init slit_valid(struct acpi_table_slit *slit) |
39b8931b FY |
187 | { |
188 | int i, j; | |
189 | int d = slit->locality_count; | |
190 | for (i = 0; i < d; i++) { | |
191 | for (j = 0; j < d; j++) { | |
192 | u8 val = slit->entry[d*i + j]; | |
193 | if (i == j) { | |
194 | if (val != LOCAL_DISTANCE) | |
195 | return 0; | |
196 | } else if (val <= LOCAL_DISTANCE) | |
197 | return 0; | |
198 | } | |
199 | } | |
200 | return 1; | |
201 | } | |
202 | ||
e84025e2 DD |
203 | void __init bad_srat(void) |
204 | { | |
205 | pr_err("SRAT: SRAT not used.\n"); | |
206 | acpi_numa = -1; | |
207 | } | |
208 | ||
209 | int __init srat_disabled(void) | |
210 | { | |
211 | return acpi_numa < 0; | |
212 | } | |
213 | ||
6525afdf HG |
214 | #if defined(CONFIG_X86) || defined(CONFIG_ARM64) |
215 | /* | |
216 | * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for | |
217 | * I/O localities since SRAT does not list them. I/O localities are | |
218 | * not supported at this point. | |
219 | */ | |
220 | void __init acpi_numa_slit_init(struct acpi_table_slit *slit) | |
221 | { | |
222 | int i, j; | |
223 | ||
224 | for (i = 0; i < slit->locality_count; i++) { | |
225 | const int from_node = pxm_to_node(i); | |
226 | ||
227 | if (from_node == NUMA_NO_NODE) | |
228 | continue; | |
229 | ||
230 | for (j = 0; j < slit->locality_count; j++) { | |
231 | const int to_node = pxm_to_node(j); | |
232 | ||
233 | if (to_node == NUMA_NO_NODE) | |
234 | continue; | |
235 | ||
236 | numa_set_distance(from_node, to_node, | |
237 | slit->entry[slit->locality_count * i + j]); | |
238 | } | |
239 | } | |
240 | } | |
3770442e HG |
241 | |
242 | /* | |
243 | * Default callback for parsing of the Proximity Domain <-> Memory | |
244 | * Area mappings | |
245 | */ | |
246 | int __init | |
247 | acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) | |
248 | { | |
249 | u64 start, end; | |
250 | u32 hotpluggable; | |
251 | int node, pxm; | |
252 | ||
253 | if (srat_disabled()) | |
254 | goto out_err; | |
e0af261a DD |
255 | if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { |
256 | pr_err("SRAT: Unexpected header length: %d\n", | |
257 | ma->header.length); | |
3770442e | 258 | goto out_err_bad_srat; |
e0af261a | 259 | } |
3770442e HG |
260 | if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) |
261 | goto out_err; | |
262 | hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE; | |
263 | if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) | |
264 | goto out_err; | |
265 | ||
266 | start = ma->base_address; | |
267 | end = start + ma->length; | |
268 | pxm = ma->proximity_domain; | |
269 | if (acpi_srat_revision <= 1) | |
270 | pxm &= 0xff; | |
271 | ||
272 | node = acpi_map_pxm_to_node(pxm); | |
e0af261a DD |
273 | if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) { |
274 | pr_err("SRAT: Too many proximity domains.\n"); | |
3770442e HG |
275 | goto out_err_bad_srat; |
276 | } | |
277 | ||
e0af261a DD |
278 | if (numa_add_memblk(node, start, end) < 0) { |
279 | pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", | |
280 | node, (unsigned long long) start, | |
281 | (unsigned long long) end - 1); | |
3770442e | 282 | goto out_err_bad_srat; |
e0af261a | 283 | } |
3770442e HG |
284 | |
285 | node_set(node, numa_nodes_parsed); | |
286 | ||
287 | pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", | |
288 | node, pxm, | |
289 | (unsigned long long) start, (unsigned long long) end - 1, | |
290 | hotpluggable ? " hotplug" : "", | |
291 | ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); | |
292 | ||
293 | /* Mark hotplug range in memblock. */ | |
294 | if (hotpluggable && memblock_mark_hotplug(start, ma->length)) | |
295 | pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", | |
296 | (unsigned long long)start, (unsigned long long)end - 1); | |
297 | ||
298 | max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); | |
299 | ||
300 | return 0; | |
301 | out_err_bad_srat: | |
302 | bad_srat(); | |
303 | out_err: | |
304 | return -EINVAL; | |
305 | } | |
6525afdf HG |
306 | #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ |
307 | ||
15a58ed1 | 308 | static int __init acpi_parse_slit(struct acpi_table_header *table) |
1da177e4 | 309 | { |
2fad9308 | 310 | struct acpi_table_slit *slit = (struct acpi_table_slit *)table; |
1da177e4 | 311 | |
39b8931b | 312 | if (!slit_valid(slit)) { |
ac906a6d | 313 | pr_info("SLIT table looks invalid. Not used.\n"); |
39b8931b FY |
314 | return -EINVAL; |
315 | } | |
1da177e4 LT |
316 | acpi_numa_slit_init(slit); |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
beffbe54 | 321 | void __init __weak |
7237d3de SS |
322 | acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) |
323 | { | |
ac906a6d | 324 | pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); |
7237d3de SS |
325 | } |
326 | ||
7237d3de | 327 | static int __init |
60574d1e | 328 | acpi_parse_x2apic_affinity(union acpi_subtable_headers *header, |
7237d3de SS |
329 | const unsigned long end) |
330 | { | |
331 | struct acpi_srat_x2apic_cpu_affinity *processor_affinity; | |
332 | ||
333 | processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; | |
334 | if (!processor_affinity) | |
335 | return -EINVAL; | |
336 | ||
60574d1e | 337 | acpi_table_print_srat_entry(&header->common); |
7237d3de SS |
338 | |
339 | /* let architecture-dependent part to do it */ | |
340 | acpi_numa_x2apic_affinity_init(processor_affinity); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
1da177e4 | 345 | static int __init |
60574d1e | 346 | acpi_parse_processor_affinity(union acpi_subtable_headers *header, |
4be44fcd | 347 | const unsigned long end) |
1da177e4 | 348 | { |
15a58ed1 | 349 | struct acpi_srat_cpu_affinity *processor_affinity; |
1da177e4 | 350 | |
15a58ed1 | 351 | processor_affinity = (struct acpi_srat_cpu_affinity *)header; |
1da177e4 LT |
352 | if (!processor_affinity) |
353 | return -EINVAL; | |
354 | ||
60574d1e | 355 | acpi_table_print_srat_entry(&header->common); |
1da177e4 LT |
356 | |
357 | /* let architecture-dependent part to do it */ | |
358 | acpi_numa_processor_affinity_init(processor_affinity); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
4bac6fa7 | 363 | static int __init |
60574d1e | 364 | acpi_parse_gicc_affinity(union acpi_subtable_headers *header, |
4bac6fa7 HG |
365 | const unsigned long end) |
366 | { | |
367 | struct acpi_srat_gicc_affinity *processor_affinity; | |
368 | ||
369 | processor_affinity = (struct acpi_srat_gicc_affinity *)header; | |
370 | if (!processor_affinity) | |
371 | return -EINVAL; | |
372 | ||
60574d1e | 373 | acpi_table_print_srat_entry(&header->common); |
4bac6fa7 HG |
374 | |
375 | /* let architecture-dependent part to do it */ | |
376 | acpi_numa_gicc_affinity_init(processor_affinity); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
095adbb6 TR |
381 | static int __initdata parsed_numa_memblks; |
382 | ||
1da177e4 | 383 | static int __init |
60574d1e | 384 | acpi_parse_memory_affinity(union acpi_subtable_headers * header, |
4be44fcd | 385 | const unsigned long end) |
1da177e4 | 386 | { |
15a58ed1 | 387 | struct acpi_srat_mem_affinity *memory_affinity; |
1da177e4 | 388 | |
15a58ed1 | 389 | memory_affinity = (struct acpi_srat_mem_affinity *)header; |
1da177e4 LT |
390 | if (!memory_affinity) |
391 | return -EINVAL; | |
392 | ||
60574d1e | 393 | acpi_table_print_srat_entry(&header->common); |
1da177e4 LT |
394 | |
395 | /* let architecture-dependent part to do it */ | |
095adbb6 TR |
396 | if (!acpi_numa_memory_affinity_init(memory_affinity)) |
397 | parsed_numa_memblks++; | |
1da177e4 LT |
398 | return 0; |
399 | } | |
400 | ||
15a58ed1 | 401 | static int __init acpi_parse_srat(struct acpi_table_header *table) |
1da177e4 | 402 | { |
2fad9308 | 403 | struct acpi_table_srat *srat = (struct acpi_table_srat *)table; |
1da177e4 | 404 | |
8df0eb7c KG |
405 | acpi_srat_revision = srat->header.revision; |
406 | ||
cfa806f0 | 407 | /* Real work done in acpi_table_parse_srat below. */ |
1da177e4 LT |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
ae2c6dcf | 412 | static int __init |
15a58ed1 | 413 | acpi_table_parse_srat(enum acpi_srat_type id, |
b43e1065 | 414 | acpi_tbl_entry_handler handler, unsigned int max_entries) |
1da177e4 | 415 | { |
6eb87fed | 416 | return acpi_table_parse_entries(ACPI_SIG_SRAT, |
4be44fcd LB |
417 | sizeof(struct acpi_table_srat), id, |
418 | handler, max_entries); | |
1da177e4 LT |
419 | } |
420 | ||
20e6926d | 421 | int __init acpi_numa_init(void) |
e8d19552 | 422 | { |
20e6926d YL |
423 | int cnt = 0; |
424 | ||
4bac6fa7 HG |
425 | if (acpi_disabled) |
426 | return -EINVAL; | |
427 | ||
d3bd0588 YL |
428 | /* |
429 | * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= | |
430 | * SRAT cpu entries could have different order with that in MADT. | |
431 | * So go over all cpu entries in SRAT to get apicid to node mapping. | |
432 | */ | |
8716273c | 433 | |
02cb489b | 434 | /* SRAT: System Resource Affinity Table */ |
7f8f97c3 | 435 | if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { |
4bac6fa7 | 436 | struct acpi_subtable_proc srat_proc[3]; |
702b07fc LA |
437 | |
438 | memset(srat_proc, 0, sizeof(srat_proc)); | |
439 | srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; | |
440 | srat_proc[0].handler = acpi_parse_processor_affinity; | |
441 | srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; | |
442 | srat_proc[1].handler = acpi_parse_x2apic_affinity; | |
4bac6fa7 HG |
443 | srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; |
444 | srat_proc[2].handler = acpi_parse_gicc_affinity; | |
702b07fc LA |
445 | |
446 | acpi_table_parse_entries_array(ACPI_SIG_SRAT, | |
447 | sizeof(struct acpi_table_srat), | |
448 | srat_proc, ARRAY_SIZE(srat_proc), 0); | |
449 | ||
20e6926d | 450 | cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, |
fd3e4543 | 451 | acpi_parse_memory_affinity, 0); |
1da177e4 LT |
452 | } |
453 | ||
454 | /* SLIT: System Locality Information Table */ | |
7f8f97c3 | 455 | acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); |
1da177e4 | 456 | |
20e6926d YL |
457 | if (cnt < 0) |
458 | return cnt; | |
095adbb6 | 459 | else if (!parsed_numa_memblks) |
f3946fb6 | 460 | return -ENOENT; |
940fed2e | 461 | return 0; |
1da177e4 LT |
462 | } |
463 | ||
d79ed248 | 464 | static int acpi_get_pxm(acpi_handle h) |
1da177e4 | 465 | { |
27663c58 | 466 | unsigned long long pxm; |
1da177e4 LT |
467 | acpi_status status; |
468 | acpi_handle handle; | |
469 | acpi_handle phandle = h; | |
470 | ||
471 | do { | |
472 | handle = phandle; | |
473 | status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); | |
474 | if (ACPI_SUCCESS(status)) | |
50dd0969 | 475 | return pxm; |
1da177e4 | 476 | status = acpi_get_parent(handle, &phandle); |
4be44fcd | 477 | } while (ACPI_SUCCESS(status)); |
1da177e4 LT |
478 | return -1; |
479 | } | |
1e3590e2 | 480 | |
486c79b5 | 481 | int acpi_get_node(acpi_handle handle) |
1e3590e2 | 482 | { |
962fe9c9 | 483 | int pxm; |
1e3590e2 | 484 | |
1e3590e2 | 485 | pxm = acpi_get_pxm(handle); |
1e3590e2 | 486 | |
962fe9c9 | 487 | return acpi_map_pxm_to_node(pxm); |
1e3590e2 YG |
488 | } |
489 | EXPORT_SYMBOL(acpi_get_node); |