a2efae8a4c4eec093bcfda836e96b49e97f2251e
[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 <acpi/acpi_bus.h>
32 #include <acpi/acmacros.h>
33
34 #define ACPI_NUMA       0x80000000
35 #define _COMPONENT      ACPI_NUMA
36 ACPI_MODULE_NAME("numa");
37
38 static nodemask_t nodes_found_map = NODE_MASK_NONE;
39 #define PXM_INVAL       -1
40 #define NID_INVAL       -1
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] = NID_INVAL };
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 NID_INVAL;
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 int __cpuinit acpi_map_pxm_to_node(int pxm)
63 {
64         int node = pxm_to_node_map[pxm];
65
66         if (node < 0){
67                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
68                         return NID_INVAL;
69                 node = first_unset_node(nodes_found_map);
70                 pxm_to_node_map[pxm] = node;
71                 node_to_pxm_map[node] = pxm;
72                 node_set(node, nodes_found_map);
73         }
74
75         return node;
76 }
77
78 void __cpuinit acpi_unmap_pxm_to_node(int node)
79 {
80         int pxm = node_to_pxm_map[node];
81         pxm_to_node_map[pxm] = NID_INVAL;
82         node_to_pxm_map[node] = PXM_INVAL;
83         node_clear(node, nodes_found_map);
84 }
85
86 void __init acpi_table_print_srat_entry(struct acpi_subtable_header * header)
87 {
88
89         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
90
91         if (!header)
92                 return;
93
94         switch (header->type) {
95
96         case ACPI_SRAT_TYPE_CPU_AFFINITY:
97 #ifdef ACPI_DEBUG_OUTPUT
98                 {
99                         struct acpi_srat_cpu_affinity *p =
100                             (struct acpi_srat_cpu_affinity *)header;
101                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
102                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
103                                           p->apic_id, p->local_sapic_eid,
104                                           p->proximity_domain_lo,
105                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
106                                           "enabled" : "disabled"));
107                 }
108 #endif                          /* ACPI_DEBUG_OUTPUT */
109                 break;
110
111         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
112 #ifdef ACPI_DEBUG_OUTPUT
113                 {
114                         struct acpi_srat_mem_affinity *p =
115                             (struct acpi_srat_mem_affinity *)header;
116                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
117                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
118                                           (unsigned long)p->base_address,
119                                           (unsigned long)p->length,
120                                           p->memory_type, p->proximity_domain,
121                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
122                                           "enabled" : "disabled",
123                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
124                                           " hot-pluggable" : ""));
125                 }
126 #endif                          /* ACPI_DEBUG_OUTPUT */
127                 break;
128
129         default:
130                 printk(KERN_WARNING PREFIX
131                        "Found unsupported SRAT entry (type = 0x%x)\n",
132                        header->type);
133                 break;
134         }
135 }
136
137 static int __init acpi_parse_slit(struct acpi_table_header *table)
138 {
139         struct acpi_table_slit *slit;
140         u32 localities;
141
142         if (!table)
143                 return -EINVAL;
144
145         slit = (struct acpi_table_slit *)table;
146
147         /* downcast just for %llu vs %lu for i386/ia64  */
148         localities = (u32) slit->locality_count;
149
150         acpi_numa_slit_init(slit);
151
152         return 0;
153 }
154
155 static int __init
156 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
157                               const unsigned long end)
158 {
159         struct acpi_srat_cpu_affinity *processor_affinity;
160
161         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
162         if (!processor_affinity)
163                 return -EINVAL;
164
165         acpi_table_print_srat_entry(header);
166
167         /* let architecture-dependent part to do it */
168         acpi_numa_processor_affinity_init(processor_affinity);
169
170         return 0;
171 }
172
173 static int __init
174 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
175                            const unsigned long end)
176 {
177         struct acpi_srat_mem_affinity *memory_affinity;
178
179         memory_affinity = (struct acpi_srat_mem_affinity *)header;
180         if (!memory_affinity)
181                 return -EINVAL;
182
183         acpi_table_print_srat_entry(header);
184
185         /* let architecture-dependent part to do it */
186         acpi_numa_memory_affinity_init(memory_affinity);
187
188         return 0;
189 }
190
191 static int __init acpi_parse_srat(struct acpi_table_header *table)
192 {
193         struct acpi_table_srat *srat;
194
195         if (!table)
196                 return -EINVAL;
197
198         srat = (struct acpi_table_srat *)table;
199
200         return 0;
201 }
202
203 int __init
204 acpi_table_parse_srat(enum acpi_srat_type id,
205                       acpi_table_entry_handler handler, unsigned int max_entries)
206 {
207         return acpi_table_parse_entries(ACPI_SIG_SRAT,
208                                             sizeof(struct acpi_table_srat), id,
209                                             handler, max_entries);
210 }
211
212 int __init acpi_numa_init(void)
213 {
214         int result;
215
216         /* SRAT: Static Resource Affinity Table */
217         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
218                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
219                                                acpi_parse_processor_affinity,
220                                                NR_CPUS);
221                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, acpi_parse_memory_affinity, NR_NODE_MEMBLKS);    // IA64 specific
222         }
223
224         /* SLIT: System Locality Information Table */
225         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
226
227         acpi_numa_arch_fixup();
228         return 0;
229 }
230
231 int acpi_get_pxm(acpi_handle h)
232 {
233         unsigned long pxm;
234         acpi_status status;
235         acpi_handle handle;
236         acpi_handle phandle = h;
237
238         do {
239                 handle = phandle;
240                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
241                 if (ACPI_SUCCESS(status))
242                         return pxm;
243                 status = acpi_get_parent(handle, &phandle);
244         } while (ACPI_SUCCESS(status));
245         return -1;
246 }
247 EXPORT_SYMBOL(acpi_get_pxm);
248
249 int acpi_get_node(acpi_handle *handle)
250 {
251         int pxm, node = -1;
252
253         pxm = acpi_get_pxm(handle);
254         if (pxm >= 0)
255                 node = acpi_map_pxm_to_node(pxm);
256
257         return node;
258 }
259 EXPORT_SYMBOL(acpi_get_node);