Merge branch 'misc-2.6.33' into release
[linux-2.6.git] / drivers / acpi / numa.c
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
38 ACPI_MODULE_NAME("numa");
39
40 static nodemask_t nodes_found_map = NODE_MASK_NONE;
41
42 /* maps to convert between proximity domain and logical node ID */
43 static int pxm_to_node_map[MAX_PXM_DOMAINS]
44                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
45 static int node_to_pxm_map[MAX_NUMNODES]
46                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
47
48 int pxm_to_node(int pxm)
49 {
50         if (pxm < 0)
51                 return NUMA_NO_NODE;
52         return pxm_to_node_map[pxm];
53 }
54
55 int node_to_pxm(int node)
56 {
57         if (node < 0)
58                 return PXM_INVAL;
59         return node_to_pxm_map[node];
60 }
61
62 void __acpi_map_pxm_to_node(int pxm, int node)
63 {
64         pxm_to_node_map[pxm] = node;
65         node_to_pxm_map[node] = pxm;
66 }
67
68 int acpi_map_pxm_to_node(int pxm)
69 {
70         int node = pxm_to_node_map[pxm];
71
72         if (node < 0) {
73                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
74                         return NUMA_NO_NODE;
75                 node = first_unset_node(nodes_found_map);
76                 __acpi_map_pxm_to_node(pxm, node);
77                 node_set(node, nodes_found_map);
78         }
79
80         return node;
81 }
82
83 static void __init
84 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
85 {
86
87         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
88
89         if (!header)
90                 return;
91
92         switch (header->type) {
93
94         case ACPI_SRAT_TYPE_CPU_AFFINITY:
95 #ifdef ACPI_DEBUG_OUTPUT
96                 {
97                         struct acpi_srat_cpu_affinity *p =
98                             (struct acpi_srat_cpu_affinity *)header;
99                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
100                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
101                                           p->apic_id, p->local_sapic_eid,
102                                           p->proximity_domain_lo,
103                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
104                                           "enabled" : "disabled"));
105                 }
106 #endif                          /* ACPI_DEBUG_OUTPUT */
107                 break;
108
109         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
110 #ifdef ACPI_DEBUG_OUTPUT
111                 {
112                         struct acpi_srat_mem_affinity *p =
113                             (struct acpi_srat_mem_affinity *)header;
114                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
115                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
116                                           (unsigned long)p->base_address,
117                                           (unsigned long)p->length,
118                                           p->proximity_domain,
119                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
120                                           "enabled" : "disabled",
121                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
122                                           " hot-pluggable" : ""));
123                 }
124 #endif                          /* ACPI_DEBUG_OUTPUT */
125                 break;
126
127         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
128 #ifdef ACPI_DEBUG_OUTPUT
129                 {
130                         struct acpi_srat_x2apic_cpu_affinity *p =
131                             (struct acpi_srat_x2apic_cpu_affinity *)header;
132                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
133                                           "SRAT Processor (x2apicid[0x%08x]) in"
134                                           " proximity domain %d %s\n",
135                                           p->apic_id,
136                                           p->proximity_domain,
137                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
138                                           "enabled" : "disabled"));
139                 }
140 #endif                          /* ACPI_DEBUG_OUTPUT */
141                 break;
142         default:
143                 printk(KERN_WARNING PREFIX
144                        "Found unsupported SRAT entry (type = 0x%x)\n",
145                        header->type);
146                 break;
147         }
148 }
149
150 /*
151  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
152  * up the NUMA heuristics which wants the local node to have a smaller
153  * distance than the others.
154  * Do some quick checks here and only use the SLIT if it passes.
155  */
156 static __init int slit_valid(struct acpi_table_slit *slit)
157 {
158         int i, j;
159         int d = slit->locality_count;
160         for (i = 0; i < d; i++) {
161                 for (j = 0; j < d; j++)  {
162                         u8 val = slit->entry[d*i + j];
163                         if (i == j) {
164                                 if (val != LOCAL_DISTANCE)
165                                         return 0;
166                         } else if (val <= LOCAL_DISTANCE)
167                                 return 0;
168                 }
169         }
170         return 1;
171 }
172
173 static int __init acpi_parse_slit(struct acpi_table_header *table)
174 {
175         struct acpi_table_slit *slit;
176
177         if (!table)
178                 return -EINVAL;
179
180         slit = (struct acpi_table_slit *)table;
181
182         if (!slit_valid(slit)) {
183                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
184                 return -EINVAL;
185         }
186         acpi_numa_slit_init(slit);
187
188         return 0;
189 }
190
191 void __init __attribute__ ((weak))
192 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
193 {
194         printk(KERN_WARNING PREFIX
195                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
196         return;
197 }
198
199
200 static int __init
201 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
202                            const unsigned long end)
203 {
204         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
205
206         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
207         if (!processor_affinity)
208                 return -EINVAL;
209
210         acpi_table_print_srat_entry(header);
211
212         /* let architecture-dependent part to do it */
213         acpi_numa_x2apic_affinity_init(processor_affinity);
214
215         return 0;
216 }
217
218 static int __init
219 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
220                               const unsigned long end)
221 {
222         struct acpi_srat_cpu_affinity *processor_affinity;
223
224         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
225         if (!processor_affinity)
226                 return -EINVAL;
227
228         acpi_table_print_srat_entry(header);
229
230         /* let architecture-dependent part to do it */
231         acpi_numa_processor_affinity_init(processor_affinity);
232
233         return 0;
234 }
235
236 static int __init
237 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
238                            const unsigned long end)
239 {
240         struct acpi_srat_mem_affinity *memory_affinity;
241
242         memory_affinity = (struct acpi_srat_mem_affinity *)header;
243         if (!memory_affinity)
244                 return -EINVAL;
245
246         acpi_table_print_srat_entry(header);
247
248         /* let architecture-dependent part to do it */
249         acpi_numa_memory_affinity_init(memory_affinity);
250
251         return 0;
252 }
253
254 static int __init acpi_parse_srat(struct acpi_table_header *table)
255 {
256         struct acpi_table_srat *srat;
257
258         if (!table)
259                 return -EINVAL;
260
261         srat = (struct acpi_table_srat *)table;
262
263         return 0;
264 }
265
266 static int __init
267 acpi_table_parse_srat(enum acpi_srat_type id,
268                       acpi_table_entry_handler handler, unsigned int max_entries)
269 {
270         return acpi_table_parse_entries(ACPI_SIG_SRAT,
271                                             sizeof(struct acpi_table_srat), id,
272                                             handler, max_entries);
273 }
274
275 int __init acpi_numa_init(void)
276 {
277         int ret = 0;
278
279         /* SRAT: Static Resource Affinity Table */
280         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
281                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
282                                       acpi_parse_x2apic_affinity, NR_CPUS);
283                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
284                                       acpi_parse_processor_affinity, NR_CPUS);
285                 ret = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
286                                             acpi_parse_memory_affinity,
287                                             NR_NODE_MEMBLKS);
288         }
289
290         /* SLIT: System Locality Information Table */
291         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
292
293         acpi_numa_arch_fixup();
294         return ret;
295 }
296
297 int acpi_get_pxm(acpi_handle h)
298 {
299         unsigned long long pxm;
300         acpi_status status;
301         acpi_handle handle;
302         acpi_handle phandle = h;
303
304         do {
305                 handle = phandle;
306                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
307                 if (ACPI_SUCCESS(status))
308                         return pxm;
309                 status = acpi_get_parent(handle, &phandle);
310         } while (ACPI_SUCCESS(status));
311         return -1;
312 }
313
314 int acpi_get_node(acpi_handle *handle)
315 {
316         int pxm, node = -1;
317
318         pxm = acpi_get_pxm(handle);
319         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
320                 node = acpi_map_pxm_to_node(pxm);
321
322         return node;
323 }
324 EXPORT_SYMBOL(acpi_get_node);