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