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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 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/types.h>
29#include <linux/errno.h>
30#include <linux/acpi.h>
31#include <linux/numa.h>
32#include <acpi/acpi_bus.h>
33
34#define PREFIX "ACPI: "
35
36#define ACPI_NUMA 0x80000000
37#define _COMPONENT ACPI_NUMA
38ACPI_MODULE_NAME("numa");
39
40static nodemask_t nodes_found_map = NODE_MASK_NONE;
41
42/* maps to convert between proximity domain and logical node ID */
43static int pxm_to_node_map[MAX_PXM_DOMAINS]
44 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
45static int node_to_pxm_map[MAX_NUMNODES]
46 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
47
48unsigned char acpi_srat_revision __initdata;
49
50int pxm_to_node(int pxm)
51{
52 if (pxm < 0)
53 return NUMA_NO_NODE;
54 return pxm_to_node_map[pxm];
55}
56
57int node_to_pxm(int node)
58{
59 if (node < 0)
60 return PXM_INVAL;
61 return node_to_pxm_map[node];
62}
63
64void __acpi_map_pxm_to_node(int pxm, int node)
65{
66 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
67 pxm_to_node_map[pxm] = node;
68 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
69 node_to_pxm_map[node] = pxm;
70}
71
72int acpi_map_pxm_to_node(int pxm)
73{
74 int node = pxm_to_node_map[pxm];
75
76 if (node < 0) {
77 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
78 return NUMA_NO_NODE;
79 node = first_unset_node(nodes_found_map);
80 __acpi_map_pxm_to_node(pxm, node);
81 node_set(node, nodes_found_map);
82 }
83
84 return node;
85}
86
87static void __init
88acpi_table_print_srat_entry(struct acpi_subtable_header *header)
89{
90
91 ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
92
93 if (!header)
94 return;
95
96 switch (header->type) {
97
98 case ACPI_SRAT_TYPE_CPU_AFFINITY:
99#ifdef ACPI_DEBUG_OUTPUT
100 {
101 struct acpi_srat_cpu_affinity *p =
102 (struct acpi_srat_cpu_affinity *)header;
103 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
104 "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
105 p->apic_id, p->local_sapic_eid,
106 p->proximity_domain_lo,
107 (p->flags & ACPI_SRAT_CPU_ENABLED)?
108 "enabled" : "disabled"));
109 }
110#endif /* ACPI_DEBUG_OUTPUT */
111 break;
112
113 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
114#ifdef ACPI_DEBUG_OUTPUT
115 {
116 struct acpi_srat_mem_affinity *p =
117 (struct acpi_srat_mem_affinity *)header;
118 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
119 "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
120 (unsigned long)p->base_address,
121 (unsigned long)p->length,
122 p->proximity_domain,
123 (p->flags & ACPI_SRAT_MEM_ENABLED)?
124 "enabled" : "disabled",
125 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
126 " hot-pluggable" : ""));
127 }
128#endif /* ACPI_DEBUG_OUTPUT */
129 break;
130
131 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
132#ifdef ACPI_DEBUG_OUTPUT
133 {
134 struct acpi_srat_x2apic_cpu_affinity *p =
135 (struct acpi_srat_x2apic_cpu_affinity *)header;
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
137 "SRAT Processor (x2apicid[0x%08x]) in"
138 " proximity domain %d %s\n",
139 p->apic_id,
140 p->proximity_domain,
141 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
142 "enabled" : "disabled"));
143 }
144#endif /* ACPI_DEBUG_OUTPUT */
145 break;
146 default:
147 printk(KERN_WARNING PREFIX
148 "Found unsupported SRAT entry (type = 0x%x)\n",
149 header->type);
150 break;
151 }
152}
153
154/*
155 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
156 * up the NUMA heuristics which wants the local node to have a smaller
157 * distance than the others.
158 * Do some quick checks here and only use the SLIT if it passes.
159 */
160static __init int slit_valid(struct acpi_table_slit *slit)
161{
162 int i, j;
163 int d = slit->locality_count;
164 for (i = 0; i < d; i++) {
165 for (j = 0; j < d; j++) {
166 u8 val = slit->entry[d*i + j];
167 if (i == j) {
168 if (val != LOCAL_DISTANCE)
169 return 0;
170 } else if (val <= LOCAL_DISTANCE)
171 return 0;
172 }
173 }
174 return 1;
175}
176
177static int __init acpi_parse_slit(struct acpi_table_header *table)
178{
179 struct acpi_table_slit *slit;
180
181 if (!table)
182 return -EINVAL;
183
184 slit = (struct acpi_table_slit *)table;
185
186 if (!slit_valid(slit)) {
187 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
188 return -EINVAL;
189 }
190 acpi_numa_slit_init(slit);
191
192 return 0;
193}
194
195void __init __attribute__ ((weak))
196acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
197{
198 printk(KERN_WARNING PREFIX
199 "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
200 return;
201}
202
203
204static int __init
205acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
206 const unsigned long end)
207{
208 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
209
210 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
211 if (!processor_affinity)
212 return -EINVAL;
213
214 acpi_table_print_srat_entry(header);
215
216 /* let architecture-dependent part to do it */
217 acpi_numa_x2apic_affinity_init(processor_affinity);
218
219 return 0;
220}
221
222static int __init
223acpi_parse_processor_affinity(struct acpi_subtable_header *header,
224 const unsigned long end)
225{
226 struct acpi_srat_cpu_affinity *processor_affinity;
227
228 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
229 if (!processor_affinity)
230 return -EINVAL;
231
232 acpi_table_print_srat_entry(header);
233
234 /* let architecture-dependent part to do it */
235 acpi_numa_processor_affinity_init(processor_affinity);
236
237 return 0;
238}
239
240static int __init
241acpi_parse_memory_affinity(struct acpi_subtable_header * header,
242 const unsigned long end)
243{
244 struct acpi_srat_mem_affinity *memory_affinity;
245
246 memory_affinity = (struct acpi_srat_mem_affinity *)header;
247 if (!memory_affinity)
248 return -EINVAL;
249
250 acpi_table_print_srat_entry(header);
251
252 /* let architecture-dependent part to do it */
253 acpi_numa_memory_affinity_init(memory_affinity);
254
255 return 0;
256}
257
258static int __init acpi_parse_srat(struct acpi_table_header *table)
259{
260 struct acpi_table_srat *srat;
261 if (!table)
262 return -EINVAL;
263
264 srat = (struct acpi_table_srat *)table;
265 acpi_srat_revision = srat->header.revision;
266
267 /* Real work done in acpi_table_parse_srat below. */
268
269 return 0;
270}
271
272static int __init
273acpi_table_parse_srat(enum acpi_srat_type id,
274 acpi_table_entry_handler handler, unsigned int max_entries)
275{
276 return acpi_table_parse_entries(ACPI_SIG_SRAT,
277 sizeof(struct acpi_table_srat), id,
278 handler, max_entries);
279}
280
281int __init acpi_numa_init(void)
282{
283 int cnt = 0;
284
285 /*
286 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
287 * SRAT cpu entries could have different order with that in MADT.
288 * So go over all cpu entries in SRAT to get apicid to node mapping.
289 */
290
291 /* SRAT: Static Resource Affinity Table */
292 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
293 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
294 acpi_parse_x2apic_affinity, 0);
295 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
296 acpi_parse_processor_affinity, 0);
297 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
298 acpi_parse_memory_affinity,
299 NR_NODE_MEMBLKS);
300 }
301
302 /* SLIT: System Locality Information Table */
303 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
304
305 acpi_numa_arch_fixup();
306
307 if (cnt <= 0)
308 return cnt ?: -ENOENT;
309 return 0;
310}
311
312int acpi_get_pxm(acpi_handle h)
313{
314 unsigned long long pxm;
315 acpi_status status;
316 acpi_handle handle;
317 acpi_handle phandle = h;
318
319 do {
320 handle = phandle;
321 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
322 if (ACPI_SUCCESS(status))
323 return pxm;
324 status = acpi_get_parent(handle, &phandle);
325 } while (ACPI_SUCCESS(status));
326 return -1;
327}
328
329int acpi_get_node(acpi_handle *handle)
330{
331 int pxm, node = -1;
332
333 pxm = acpi_get_pxm(handle);
334 if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
335 node = acpi_map_pxm_to_node(pxm);
336
337 return node;
338}
339EXPORT_SYMBOL(acpi_get_node);
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 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 *
20 */
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/types.h>
25#include <linux/errno.h>
26#include <linux/acpi.h>
27#include <linux/numa.h>
28#include <linux/nodemask.h>
29#include <linux/topology.h>
30
31#define PREFIX "ACPI: "
32
33#define ACPI_NUMA 0x80000000
34#define _COMPONENT ACPI_NUMA
35ACPI_MODULE_NAME("numa");
36
37static nodemask_t nodes_found_map = NODE_MASK_NONE;
38
39/* maps to convert between proximity domain and logical node ID */
40static int pxm_to_node_map[MAX_PXM_DOMAINS]
41 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
42static int node_to_pxm_map[MAX_NUMNODES]
43 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
44
45unsigned char acpi_srat_revision __initdata;
46
47int pxm_to_node(int pxm)
48{
49 if (pxm < 0)
50 return NUMA_NO_NODE;
51 return pxm_to_node_map[pxm];
52}
53
54int node_to_pxm(int node)
55{
56 if (node < 0)
57 return PXM_INVAL;
58 return node_to_pxm_map[node];
59}
60
61static void __acpi_map_pxm_to_node(int pxm, int node)
62{
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;
67}
68
69int acpi_map_pxm_to_node(int pxm)
70{
71 int node;
72
73 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS)
74 return NUMA_NO_NODE;
75
76 node = pxm_to_node_map[pxm];
77
78 if (node == NUMA_NO_NODE) {
79 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
80 return NUMA_NO_NODE;
81 node = first_unset_node(nodes_found_map);
82 __acpi_map_pxm_to_node(pxm, node);
83 node_set(node, nodes_found_map);
84 }
85
86 return node;
87}
88
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 */
104int 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}
126EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
127
128static void __init
129acpi_table_print_srat_entry(struct acpi_subtable_header *header)
130{
131
132 ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
133
134 if (!header)
135 return;
136
137 switch (header->type) {
138
139 case ACPI_SRAT_TYPE_CPU_AFFINITY:
140#ifdef ACPI_DEBUG_OUTPUT
141 {
142 struct acpi_srat_cpu_affinity *p =
143 (struct acpi_srat_cpu_affinity *)header;
144 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
145 "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
146 p->apic_id, p->local_sapic_eid,
147 p->proximity_domain_lo,
148 (p->flags & ACPI_SRAT_CPU_ENABLED)?
149 "enabled" : "disabled"));
150 }
151#endif /* ACPI_DEBUG_OUTPUT */
152 break;
153
154 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
155#ifdef ACPI_DEBUG_OUTPUT
156 {
157 struct acpi_srat_mem_affinity *p =
158 (struct acpi_srat_mem_affinity *)header;
159 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
160 "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
161 (unsigned long)p->base_address,
162 (unsigned long)p->length,
163 p->proximity_domain,
164 (p->flags & ACPI_SRAT_MEM_ENABLED)?
165 "enabled" : "disabled",
166 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
167 " hot-pluggable" : "",
168 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
169 " non-volatile" : ""));
170 }
171#endif /* ACPI_DEBUG_OUTPUT */
172 break;
173
174 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
175#ifdef ACPI_DEBUG_OUTPUT
176 {
177 struct acpi_srat_x2apic_cpu_affinity *p =
178 (struct acpi_srat_x2apic_cpu_affinity *)header;
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
180 "SRAT Processor (x2apicid[0x%08x]) in"
181 " proximity domain %d %s\n",
182 p->apic_id,
183 p->proximity_domain,
184 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
185 "enabled" : "disabled"));
186 }
187#endif /* ACPI_DEBUG_OUTPUT */
188 break;
189 default:
190 printk(KERN_WARNING PREFIX
191 "Found unsupported SRAT entry (type = 0x%x)\n",
192 header->type);
193 break;
194 }
195}
196
197/*
198 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
199 * up the NUMA heuristics which wants the local node to have a smaller
200 * distance than the others.
201 * Do some quick checks here and only use the SLIT if it passes.
202 */
203static int __init slit_valid(struct acpi_table_slit *slit)
204{
205 int i, j;
206 int d = slit->locality_count;
207 for (i = 0; i < d; i++) {
208 for (j = 0; j < d; j++) {
209 u8 val = slit->entry[d*i + j];
210 if (i == j) {
211 if (val != LOCAL_DISTANCE)
212 return 0;
213 } else if (val <= LOCAL_DISTANCE)
214 return 0;
215 }
216 }
217 return 1;
218}
219
220static int __init acpi_parse_slit(struct acpi_table_header *table)
221{
222 struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
223
224 if (!slit_valid(slit)) {
225 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
226 return -EINVAL;
227 }
228 acpi_numa_slit_init(slit);
229
230 return 0;
231}
232
233void __init __weak
234acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
235{
236 printk(KERN_WARNING PREFIX
237 "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
238 return;
239}
240
241
242static int __init
243acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
244 const unsigned long end)
245{
246 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
247
248 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
249 if (!processor_affinity)
250 return -EINVAL;
251
252 acpi_table_print_srat_entry(header);
253
254 /* let architecture-dependent part to do it */
255 acpi_numa_x2apic_affinity_init(processor_affinity);
256
257 return 0;
258}
259
260static int __init
261acpi_parse_processor_affinity(struct acpi_subtable_header *header,
262 const unsigned long end)
263{
264 struct acpi_srat_cpu_affinity *processor_affinity;
265
266 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
267 if (!processor_affinity)
268 return -EINVAL;
269
270 acpi_table_print_srat_entry(header);
271
272 /* let architecture-dependent part to do it */
273 acpi_numa_processor_affinity_init(processor_affinity);
274
275 return 0;
276}
277
278static int __initdata parsed_numa_memblks;
279
280static int __init
281acpi_parse_memory_affinity(struct acpi_subtable_header * header,
282 const unsigned long end)
283{
284 struct acpi_srat_mem_affinity *memory_affinity;
285
286 memory_affinity = (struct acpi_srat_mem_affinity *)header;
287 if (!memory_affinity)
288 return -EINVAL;
289
290 acpi_table_print_srat_entry(header);
291
292 /* let architecture-dependent part to do it */
293 if (!acpi_numa_memory_affinity_init(memory_affinity))
294 parsed_numa_memblks++;
295 return 0;
296}
297
298static int __init acpi_parse_srat(struct acpi_table_header *table)
299{
300 struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
301
302 acpi_srat_revision = srat->header.revision;
303
304 /* Real work done in acpi_table_parse_srat below. */
305
306 return 0;
307}
308
309static int __init
310acpi_table_parse_srat(enum acpi_srat_type id,
311 acpi_tbl_entry_handler handler, unsigned int max_entries)
312{
313 return acpi_table_parse_entries(ACPI_SIG_SRAT,
314 sizeof(struct acpi_table_srat), id,
315 handler, max_entries);
316}
317
318int __init acpi_numa_init(void)
319{
320 int cnt = 0;
321
322 /*
323 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
324 * SRAT cpu entries could have different order with that in MADT.
325 * So go over all cpu entries in SRAT to get apicid to node mapping.
326 */
327
328 /* SRAT: Static Resource Affinity Table */
329 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
330 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
331 acpi_parse_x2apic_affinity, 0);
332 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
333 acpi_parse_processor_affinity, 0);
334 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
335 acpi_parse_memory_affinity,
336 NR_NODE_MEMBLKS);
337 }
338
339 /* SLIT: System Locality Information Table */
340 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
341
342 acpi_numa_arch_fixup();
343
344 if (cnt < 0)
345 return cnt;
346 else if (!parsed_numa_memblks)
347 return -ENOENT;
348 return 0;
349}
350
351static int acpi_get_pxm(acpi_handle h)
352{
353 unsigned long long pxm;
354 acpi_status status;
355 acpi_handle handle;
356 acpi_handle phandle = h;
357
358 do {
359 handle = phandle;
360 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
361 if (ACPI_SUCCESS(status))
362 return pxm;
363 status = acpi_get_parent(handle, &phandle);
364 } while (ACPI_SUCCESS(status));
365 return -1;
366}
367
368int acpi_get_node(acpi_handle handle)
369{
370 int pxm;
371
372 pxm = acpi_get_pxm(handle);
373
374 return acpi_map_pxm_to_node(pxm);
375}
376EXPORT_SYMBOL(acpi_get_node);