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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * acpi_numa.c - ACPI NUMA support | |
3 | * | |
4 | * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> | |
5 | * | |
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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 | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
1da177e4 LT |
18 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
19 | * | |
20 | */ | |
ac906a6d HG |
21 | |
22 | #define pr_fmt(fmt) "ACPI: " fmt | |
23 | ||
1da177e4 | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/init.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/acpi.h> | |
3770442e HG |
30 | #include <linux/bootmem.h> |
31 | #include <linux/memblock.h> | |
b552a8c5 | 32 | #include <linux/numa.h> |
99759869 TK |
33 | #include <linux/nodemask.h> |
34 | #include <linux/topology.h> | |
1da177e4 | 35 | |
762834e8 | 36 | static nodemask_t nodes_found_map = NODE_MASK_NONE; |
762834e8 YG |
37 | |
38 | /* maps to convert between proximity domain and logical node ID */ | |
ffada891 | 39 | static int pxm_to_node_map[MAX_PXM_DOMAINS] |
b552a8c5 | 40 | = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; |
ffada891 | 41 | static int node_to_pxm_map[MAX_NUMNODES] |
b552a8c5 | 42 | = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; |
762834e8 | 43 | |
8df0eb7c | 44 | unsigned char acpi_srat_revision __initdata; |
e84025e2 | 45 | int acpi_numa __initdata; |
8df0eb7c | 46 | |
f363d16f | 47 | int pxm_to_node(int pxm) |
762834e8 YG |
48 | { |
49 | if (pxm < 0) | |
b552a8c5 | 50 | return NUMA_NO_NODE; |
762834e8 YG |
51 | return pxm_to_node_map[pxm]; |
52 | } | |
53 | ||
f363d16f | 54 | int node_to_pxm(int node) |
762834e8 YG |
55 | { |
56 | if (node < 0) | |
57 | return PXM_INVAL; | |
58 | return node_to_pxm_map[node]; | |
59 | } | |
60 | ||
d79ed248 | 61 | static void __acpi_map_pxm_to_node(int pxm, int node) |
3484d798 | 62 | { |
0f9b75ef DR |
63 | if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) |
64 | pxm_to_node_map[pxm] = node; | |
65 | if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) | |
66 | node_to_pxm_map[node] = pxm; | |
3484d798 DR |
67 | } |
68 | ||
8ff6f48d | 69 | int acpi_map_pxm_to_node(int pxm) |
762834e8 | 70 | { |
99759869 TK |
71 | int node; |
72 | ||
aec03f89 | 73 | if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) |
99759869 TK |
74 | return NUMA_NO_NODE; |
75 | ||
76 | node = pxm_to_node_map[pxm]; | |
762834e8 | 77 | |
1bb25df0 | 78 | if (node == NUMA_NO_NODE) { |
762834e8 | 79 | if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) |
b552a8c5 | 80 | return NUMA_NO_NODE; |
762834e8 | 81 | node = first_unset_node(nodes_found_map); |
3484d798 | 82 | __acpi_map_pxm_to_node(pxm, node); |
762834e8 YG |
83 | node_set(node, nodes_found_map); |
84 | } | |
85 | ||
86 | return node; | |
87 | } | |
88 | ||
99759869 TK |
89 | /** |
90 | * acpi_map_pxm_to_online_node - Map proximity ID to online node | |
91 | * @pxm: ACPI proximity ID | |
92 | * | |
93 | * This is similar to acpi_map_pxm_to_node(), but always returns an online | |
94 | * node. When the mapped node from a given proximity ID is offline, it | |
95 | * looks up the node distance table and returns the nearest online node. | |
96 | * | |
97 | * ACPI device drivers, which are called after the NUMA initialization has | |
98 | * completed in the kernel, can call this interface to obtain their device | |
99 | * NUMA topology from ACPI tables. Such drivers do not have to deal with | |
100 | * offline nodes. A node may be offline when a device proximity ID is | |
101 | * unique, SRAT memory entry does not exist, or NUMA is disabled, ex. | |
102 | * "numa=off" on x86. | |
103 | */ | |
104 | int acpi_map_pxm_to_online_node(int pxm) | |
105 | { | |
106 | int node, n, dist, min_dist; | |
107 | ||
108 | node = acpi_map_pxm_to_node(pxm); | |
109 | ||
110 | if (node == NUMA_NO_NODE) | |
111 | node = 0; | |
112 | ||
113 | if (!node_online(node)) { | |
114 | min_dist = INT_MAX; | |
115 | for_each_online_node(n) { | |
116 | dist = node_distance(node, n); | |
117 | if (dist < min_dist) { | |
118 | min_dist = dist; | |
119 | node = n; | |
120 | } | |
121 | } | |
122 | } | |
123 | ||
124 | return node; | |
125 | } | |
126 | EXPORT_SYMBOL(acpi_map_pxm_to_online_node); | |
127 | ||
ae2c6dcf DR |
128 | static void __init |
129 | acpi_table_print_srat_entry(struct acpi_subtable_header *header) | |
1da177e4 | 130 | { |
1da177e4 | 131 | switch (header->type) { |
15a58ed1 | 132 | case ACPI_SRAT_TYPE_CPU_AFFINITY: |
4be44fcd | 133 | { |
15a58ed1 AS |
134 | struct acpi_srat_cpu_affinity *p = |
135 | (struct acpi_srat_cpu_affinity *)header; | |
3dda4481 HG |
136 | pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", |
137 | p->apic_id, p->local_sapic_eid, | |
138 | p->proximity_domain_lo, | |
139 | (p->flags & ACPI_SRAT_CPU_ENABLED) ? | |
140 | "enabled" : "disabled"); | |
4be44fcd | 141 | } |
1da177e4 LT |
142 | break; |
143 | ||
15a58ed1 | 144 | case ACPI_SRAT_TYPE_MEMORY_AFFINITY: |
4be44fcd | 145 | { |
15a58ed1 AS |
146 | struct acpi_srat_mem_affinity *p = |
147 | (struct acpi_srat_mem_affinity *)header; | |
3dda4481 HG |
148 | pr_debug("SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n", |
149 | (unsigned long)p->base_address, | |
150 | (unsigned long)p->length, | |
151 | p->proximity_domain, | |
152 | (p->flags & ACPI_SRAT_MEM_ENABLED) ? | |
153 | "enabled" : "disabled", | |
154 | (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? | |
155 | " hot-pluggable" : "", | |
156 | (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? | |
157 | " non-volatile" : ""); | |
4be44fcd | 158 | } |
1da177e4 LT |
159 | break; |
160 | ||
7237d3de | 161 | case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: |
7237d3de SS |
162 | { |
163 | struct acpi_srat_x2apic_cpu_affinity *p = | |
164 | (struct acpi_srat_x2apic_cpu_affinity *)header; | |
3dda4481 HG |
165 | pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", |
166 | p->apic_id, | |
167 | p->proximity_domain, | |
168 | (p->flags & ACPI_SRAT_CPU_ENABLED) ? | |
169 | "enabled" : "disabled"); | |
7237d3de | 170 | } |
7237d3de | 171 | break; |
3dda4481 | 172 | |
4bac6fa7 HG |
173 | case ACPI_SRAT_TYPE_GICC_AFFINITY: |
174 | { | |
175 | struct acpi_srat_gicc_affinity *p = | |
176 | (struct acpi_srat_gicc_affinity *)header; | |
177 | pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", | |
178 | p->acpi_processor_uid, | |
179 | p->proximity_domain, | |
180 | (p->flags & ACPI_SRAT_GICC_ENABLED) ? | |
181 | "enabled" : "disabled"); | |
182 | } | |
183 | break; | |
184 | ||
1da177e4 | 185 | default: |
ac906a6d HG |
186 | pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", |
187 | header->type); | |
1da177e4 LT |
188 | break; |
189 | } | |
190 | } | |
191 | ||
39b8931b FY |
192 | /* |
193 | * A lot of BIOS fill in 10 (= no distance) everywhere. This messes | |
194 | * up the NUMA heuristics which wants the local node to have a smaller | |
195 | * distance than the others. | |
196 | * Do some quick checks here and only use the SLIT if it passes. | |
197 | */ | |
40e31856 | 198 | static int __init slit_valid(struct acpi_table_slit *slit) |
39b8931b FY |
199 | { |
200 | int i, j; | |
201 | int d = slit->locality_count; | |
202 | for (i = 0; i < d; i++) { | |
203 | for (j = 0; j < d; j++) { | |
204 | u8 val = slit->entry[d*i + j]; | |
205 | if (i == j) { | |
206 | if (val != LOCAL_DISTANCE) | |
207 | return 0; | |
208 | } else if (val <= LOCAL_DISTANCE) | |
209 | return 0; | |
210 | } | |
211 | } | |
212 | return 1; | |
213 | } | |
214 | ||
e84025e2 DD |
215 | void __init bad_srat(void) |
216 | { | |
217 | pr_err("SRAT: SRAT not used.\n"); | |
218 | acpi_numa = -1; | |
219 | } | |
220 | ||
221 | int __init srat_disabled(void) | |
222 | { | |
223 | return acpi_numa < 0; | |
224 | } | |
225 | ||
6525afdf HG |
226 | #if defined(CONFIG_X86) || defined(CONFIG_ARM64) |
227 | /* | |
228 | * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for | |
229 | * I/O localities since SRAT does not list them. I/O localities are | |
230 | * not supported at this point. | |
231 | */ | |
232 | void __init acpi_numa_slit_init(struct acpi_table_slit *slit) | |
233 | { | |
234 | int i, j; | |
235 | ||
236 | for (i = 0; i < slit->locality_count; i++) { | |
237 | const int from_node = pxm_to_node(i); | |
238 | ||
239 | if (from_node == NUMA_NO_NODE) | |
240 | continue; | |
241 | ||
242 | for (j = 0; j < slit->locality_count; j++) { | |
243 | const int to_node = pxm_to_node(j); | |
244 | ||
245 | if (to_node == NUMA_NO_NODE) | |
246 | continue; | |
247 | ||
248 | numa_set_distance(from_node, to_node, | |
249 | slit->entry[slit->locality_count * i + j]); | |
250 | } | |
251 | } | |
252 | } | |
3770442e HG |
253 | |
254 | /* | |
255 | * Default callback for parsing of the Proximity Domain <-> Memory | |
256 | * Area mappings | |
257 | */ | |
258 | int __init | |
259 | acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) | |
260 | { | |
261 | u64 start, end; | |
262 | u32 hotpluggable; | |
263 | int node, pxm; | |
264 | ||
265 | if (srat_disabled()) | |
266 | goto out_err; | |
e0af261a DD |
267 | if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { |
268 | pr_err("SRAT: Unexpected header length: %d\n", | |
269 | ma->header.length); | |
3770442e | 270 | goto out_err_bad_srat; |
e0af261a | 271 | } |
3770442e HG |
272 | if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) |
273 | goto out_err; | |
274 | hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE; | |
275 | if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) | |
276 | goto out_err; | |
277 | ||
278 | start = ma->base_address; | |
279 | end = start + ma->length; | |
280 | pxm = ma->proximity_domain; | |
281 | if (acpi_srat_revision <= 1) | |
282 | pxm &= 0xff; | |
283 | ||
284 | node = acpi_map_pxm_to_node(pxm); | |
e0af261a DD |
285 | if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) { |
286 | pr_err("SRAT: Too many proximity domains.\n"); | |
3770442e HG |
287 | goto out_err_bad_srat; |
288 | } | |
289 | ||
e0af261a DD |
290 | if (numa_add_memblk(node, start, end) < 0) { |
291 | pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", | |
292 | node, (unsigned long long) start, | |
293 | (unsigned long long) end - 1); | |
3770442e | 294 | goto out_err_bad_srat; |
e0af261a | 295 | } |
3770442e HG |
296 | |
297 | node_set(node, numa_nodes_parsed); | |
298 | ||
299 | pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", | |
300 | node, pxm, | |
301 | (unsigned long long) start, (unsigned long long) end - 1, | |
302 | hotpluggable ? " hotplug" : "", | |
303 | ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); | |
304 | ||
305 | /* Mark hotplug range in memblock. */ | |
306 | if (hotpluggable && memblock_mark_hotplug(start, ma->length)) | |
307 | pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", | |
308 | (unsigned long long)start, (unsigned long long)end - 1); | |
309 | ||
310 | max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); | |
311 | ||
312 | return 0; | |
313 | out_err_bad_srat: | |
314 | bad_srat(); | |
315 | out_err: | |
316 | return -EINVAL; | |
317 | } | |
6525afdf HG |
318 | #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ |
319 | ||
15a58ed1 | 320 | static int __init acpi_parse_slit(struct acpi_table_header *table) |
1da177e4 | 321 | { |
2fad9308 | 322 | struct acpi_table_slit *slit = (struct acpi_table_slit *)table; |
1da177e4 | 323 | |
39b8931b | 324 | if (!slit_valid(slit)) { |
ac906a6d | 325 | pr_info("SLIT table looks invalid. Not used.\n"); |
39b8931b FY |
326 | return -EINVAL; |
327 | } | |
1da177e4 LT |
328 | acpi_numa_slit_init(slit); |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
beffbe54 | 333 | void __init __weak |
7237d3de SS |
334 | acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) |
335 | { | |
ac906a6d | 336 | pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); |
7237d3de SS |
337 | } |
338 | ||
7237d3de SS |
339 | static int __init |
340 | acpi_parse_x2apic_affinity(struct acpi_subtable_header *header, | |
341 | const unsigned long end) | |
342 | { | |
343 | struct acpi_srat_x2apic_cpu_affinity *processor_affinity; | |
344 | ||
345 | processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; | |
346 | if (!processor_affinity) | |
347 | return -EINVAL; | |
348 | ||
349 | acpi_table_print_srat_entry(header); | |
350 | ||
351 | /* let architecture-dependent part to do it */ | |
352 | acpi_numa_x2apic_affinity_init(processor_affinity); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
1da177e4 | 357 | static int __init |
7237d3de | 358 | acpi_parse_processor_affinity(struct acpi_subtable_header *header, |
4be44fcd | 359 | const unsigned long end) |
1da177e4 | 360 | { |
15a58ed1 | 361 | struct acpi_srat_cpu_affinity *processor_affinity; |
1da177e4 | 362 | |
15a58ed1 | 363 | processor_affinity = (struct acpi_srat_cpu_affinity *)header; |
1da177e4 LT |
364 | if (!processor_affinity) |
365 | return -EINVAL; | |
366 | ||
367 | acpi_table_print_srat_entry(header); | |
368 | ||
369 | /* let architecture-dependent part to do it */ | |
370 | acpi_numa_processor_affinity_init(processor_affinity); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
4bac6fa7 HG |
375 | static int __init |
376 | acpi_parse_gicc_affinity(struct acpi_subtable_header *header, | |
377 | const unsigned long end) | |
378 | { | |
379 | struct acpi_srat_gicc_affinity *processor_affinity; | |
380 | ||
381 | processor_affinity = (struct acpi_srat_gicc_affinity *)header; | |
382 | if (!processor_affinity) | |
383 | return -EINVAL; | |
384 | ||
385 | acpi_table_print_srat_entry(header); | |
386 | ||
387 | /* let architecture-dependent part to do it */ | |
388 | acpi_numa_gicc_affinity_init(processor_affinity); | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
095adbb6 TR |
393 | static int __initdata parsed_numa_memblks; |
394 | ||
1da177e4 | 395 | static int __init |
15a58ed1 | 396 | acpi_parse_memory_affinity(struct acpi_subtable_header * header, |
4be44fcd | 397 | const unsigned long end) |
1da177e4 | 398 | { |
15a58ed1 | 399 | struct acpi_srat_mem_affinity *memory_affinity; |
1da177e4 | 400 | |
15a58ed1 | 401 | memory_affinity = (struct acpi_srat_mem_affinity *)header; |
1da177e4 LT |
402 | if (!memory_affinity) |
403 | return -EINVAL; | |
404 | ||
405 | acpi_table_print_srat_entry(header); | |
406 | ||
407 | /* let architecture-dependent part to do it */ | |
095adbb6 TR |
408 | if (!acpi_numa_memory_affinity_init(memory_affinity)) |
409 | parsed_numa_memblks++; | |
1da177e4 LT |
410 | return 0; |
411 | } | |
412 | ||
15a58ed1 | 413 | static int __init acpi_parse_srat(struct acpi_table_header *table) |
1da177e4 | 414 | { |
2fad9308 | 415 | struct acpi_table_srat *srat = (struct acpi_table_srat *)table; |
1da177e4 | 416 | |
8df0eb7c KG |
417 | acpi_srat_revision = srat->header.revision; |
418 | ||
cfa806f0 | 419 | /* Real work done in acpi_table_parse_srat below. */ |
1da177e4 LT |
420 | |
421 | return 0; | |
422 | } | |
423 | ||
ae2c6dcf | 424 | static int __init |
15a58ed1 | 425 | acpi_table_parse_srat(enum acpi_srat_type id, |
b43e1065 | 426 | acpi_tbl_entry_handler handler, unsigned int max_entries) |
1da177e4 | 427 | { |
6eb87fed | 428 | return acpi_table_parse_entries(ACPI_SIG_SRAT, |
4be44fcd LB |
429 | sizeof(struct acpi_table_srat), id, |
430 | handler, max_entries); | |
1da177e4 LT |
431 | } |
432 | ||
20e6926d | 433 | int __init acpi_numa_init(void) |
e8d19552 | 434 | { |
20e6926d YL |
435 | int cnt = 0; |
436 | ||
4bac6fa7 HG |
437 | if (acpi_disabled) |
438 | return -EINVAL; | |
439 | ||
d3bd0588 YL |
440 | /* |
441 | * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= | |
442 | * SRAT cpu entries could have different order with that in MADT. | |
443 | * So go over all cpu entries in SRAT to get apicid to node mapping. | |
444 | */ | |
8716273c | 445 | |
1da177e4 | 446 | /* SRAT: Static Resource Affinity Table */ |
7f8f97c3 | 447 | if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { |
4bac6fa7 | 448 | struct acpi_subtable_proc srat_proc[3]; |
702b07fc LA |
449 | |
450 | memset(srat_proc, 0, sizeof(srat_proc)); | |
451 | srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; | |
452 | srat_proc[0].handler = acpi_parse_processor_affinity; | |
453 | srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; | |
454 | srat_proc[1].handler = acpi_parse_x2apic_affinity; | |
4bac6fa7 HG |
455 | srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; |
456 | srat_proc[2].handler = acpi_parse_gicc_affinity; | |
702b07fc LA |
457 | |
458 | acpi_table_parse_entries_array(ACPI_SIG_SRAT, | |
459 | sizeof(struct acpi_table_srat), | |
460 | srat_proc, ARRAY_SIZE(srat_proc), 0); | |
461 | ||
20e6926d YL |
462 | cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, |
463 | acpi_parse_memory_affinity, | |
464 | NR_NODE_MEMBLKS); | |
1da177e4 LT |
465 | } |
466 | ||
467 | /* SLIT: System Locality Information Table */ | |
7f8f97c3 | 468 | acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); |
1da177e4 | 469 | |
20e6926d YL |
470 | if (cnt < 0) |
471 | return cnt; | |
095adbb6 | 472 | else if (!parsed_numa_memblks) |
f3946fb6 | 473 | return -ENOENT; |
940fed2e | 474 | return 0; |
1da177e4 LT |
475 | } |
476 | ||
d79ed248 | 477 | static int acpi_get_pxm(acpi_handle h) |
1da177e4 | 478 | { |
27663c58 | 479 | unsigned long long pxm; |
1da177e4 LT |
480 | acpi_status status; |
481 | acpi_handle handle; | |
482 | acpi_handle phandle = h; | |
483 | ||
484 | do { | |
485 | handle = phandle; | |
486 | status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); | |
487 | if (ACPI_SUCCESS(status)) | |
50dd0969 | 488 | return pxm; |
1da177e4 | 489 | status = acpi_get_parent(handle, &phandle); |
4be44fcd | 490 | } while (ACPI_SUCCESS(status)); |
1da177e4 LT |
491 | return -1; |
492 | } | |
1e3590e2 | 493 | |
486c79b5 | 494 | int acpi_get_node(acpi_handle handle) |
1e3590e2 | 495 | { |
962fe9c9 | 496 | int pxm; |
1e3590e2 | 497 | |
1e3590e2 | 498 | pxm = acpi_get_pxm(handle); |
1e3590e2 | 499 | |
962fe9c9 | 500 | return acpi_map_pxm_to_node(pxm); |
1e3590e2 YG |
501 | } |
502 | EXPORT_SYMBOL(acpi_get_node); |