Merge branch 'for-2.6.26' of git://neil.brown.name/md
[linux-2.6] / 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
40 /* maps to convert between proximity domain and logical node ID */
41 static int pxm_to_node_map[MAX_PXM_DOMAINS]
42                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
43 static int node_to_pxm_map[MAX_NUMNODES]
44                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
45
46 int pxm_to_node(int pxm)
47 {
48         if (pxm < 0)
49                 return NID_INVAL;
50         return pxm_to_node_map[pxm];
51 }
52
53 int node_to_pxm(int node)
54 {
55         if (node < 0)
56                 return PXM_INVAL;
57         return node_to_pxm_map[node];
58 }
59
60 void __acpi_map_pxm_to_node(int pxm, int node)
61 {
62         pxm_to_node_map[pxm] = node;
63         node_to_pxm_map[node] = pxm;
64 }
65
66 int acpi_map_pxm_to_node(int pxm)
67 {
68         int node = pxm_to_node_map[pxm];
69
70         if (node < 0){
71                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
72                         return NID_INVAL;
73                 node = first_unset_node(nodes_found_map);
74                 __acpi_map_pxm_to_node(pxm, node);
75                 node_set(node, nodes_found_map);
76         }
77
78         return node;
79 }
80
81 #if 0
82 void __cpuinit acpi_unmap_pxm_to_node(int node)
83 {
84         int pxm = node_to_pxm_map[node];
85         pxm_to_node_map[pxm] = NID_INVAL;
86         node_to_pxm_map[node] = PXM_INVAL;
87         node_clear(node, nodes_found_map);
88 }
89 #endif  /*  0  */
90
91 static void __init
92 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
93 {
94
95         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
96
97         if (!header)
98                 return;
99
100         switch (header->type) {
101
102         case ACPI_SRAT_TYPE_CPU_AFFINITY:
103 #ifdef ACPI_DEBUG_OUTPUT
104                 {
105                         struct acpi_srat_cpu_affinity *p =
106                             (struct acpi_srat_cpu_affinity *)header;
107                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
108                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
109                                           p->apic_id, p->local_sapic_eid,
110                                           p->proximity_domain_lo,
111                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
112                                           "enabled" : "disabled"));
113                 }
114 #endif                          /* ACPI_DEBUG_OUTPUT */
115                 break;
116
117         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
118 #ifdef ACPI_DEBUG_OUTPUT
119                 {
120                         struct acpi_srat_mem_affinity *p =
121                             (struct acpi_srat_mem_affinity *)header;
122                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
123                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
124                                           (unsigned long)p->base_address,
125                                           (unsigned long)p->length,
126                                           p->memory_type, p->proximity_domain,
127                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
128                                           "enabled" : "disabled",
129                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
130                                           " hot-pluggable" : ""));
131                 }
132 #endif                          /* ACPI_DEBUG_OUTPUT */
133                 break;
134
135         default:
136                 printk(KERN_WARNING PREFIX
137                        "Found unsupported SRAT entry (type = 0x%x)\n",
138                        header->type);
139                 break;
140         }
141 }
142
143 /*
144  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
145  * up the NUMA heuristics which wants the local node to have a smaller
146  * distance than the others.
147  * Do some quick checks here and only use the SLIT if it passes.
148  */
149 static __init int slit_valid(struct acpi_table_slit *slit)
150 {
151         int i, j;
152         int d = slit->locality_count;
153         for (i = 0; i < d; i++) {
154                 for (j = 0; j < d; j++)  {
155                         u8 val = slit->entry[d*i + j];
156                         if (i == j) {
157                                 if (val != LOCAL_DISTANCE)
158                                         return 0;
159                         } else if (val <= LOCAL_DISTANCE)
160                                 return 0;
161                 }
162         }
163         return 1;
164 }
165
166 static int __init acpi_parse_slit(struct acpi_table_header *table)
167 {
168         struct acpi_table_slit *slit;
169
170         if (!table)
171                 return -EINVAL;
172
173         slit = (struct acpi_table_slit *)table;
174
175         if (!slit_valid(slit)) {
176                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
177                 return -EINVAL;
178         }
179         acpi_numa_slit_init(slit);
180
181         return 0;
182 }
183
184 static int __init
185 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
186                               const unsigned long end)
187 {
188         struct acpi_srat_cpu_affinity *processor_affinity;
189
190         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
191         if (!processor_affinity)
192                 return -EINVAL;
193
194         acpi_table_print_srat_entry(header);
195
196         /* let architecture-dependent part to do it */
197         acpi_numa_processor_affinity_init(processor_affinity);
198
199         return 0;
200 }
201
202 static int __init
203 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
204                            const unsigned long end)
205 {
206         struct acpi_srat_mem_affinity *memory_affinity;
207
208         memory_affinity = (struct acpi_srat_mem_affinity *)header;
209         if (!memory_affinity)
210                 return -EINVAL;
211
212         acpi_table_print_srat_entry(header);
213
214         /* let architecture-dependent part to do it */
215         acpi_numa_memory_affinity_init(memory_affinity);
216
217         return 0;
218 }
219
220 static int __init acpi_parse_srat(struct acpi_table_header *table)
221 {
222         struct acpi_table_srat *srat;
223
224         if (!table)
225                 return -EINVAL;
226
227         srat = (struct acpi_table_srat *)table;
228
229         return 0;
230 }
231
232 static int __init
233 acpi_table_parse_srat(enum acpi_srat_type id,
234                       acpi_table_entry_handler handler, unsigned int max_entries)
235 {
236         return acpi_table_parse_entries(ACPI_SIG_SRAT,
237                                             sizeof(struct acpi_table_srat), id,
238                                             handler, max_entries);
239 }
240
241 int __init acpi_numa_init(void)
242 {
243         /* SRAT: Static Resource Affinity Table */
244         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
245                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
246                                       acpi_parse_processor_affinity, NR_CPUS);
247                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
248                                       acpi_parse_memory_affinity,
249                                       NR_NODE_MEMBLKS);
250         }
251
252         /* SLIT: System Locality Information Table */
253         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
254
255         acpi_numa_arch_fixup();
256         return 0;
257 }
258
259 int acpi_get_pxm(acpi_handle h)
260 {
261         unsigned long pxm;
262         acpi_status status;
263         acpi_handle handle;
264         acpi_handle phandle = h;
265
266         do {
267                 handle = phandle;
268                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
269                 if (ACPI_SUCCESS(status))
270                         return pxm;
271                 status = acpi_get_parent(handle, &phandle);
272         } while (ACPI_SUCCESS(status));
273         return -1;
274 }
275
276 int acpi_get_node(acpi_handle *handle)
277 {
278         int pxm, node = -1;
279
280         pxm = acpi_get_pxm(handle);
281         if (pxm >= 0)
282                 node = acpi_map_pxm_to_node(pxm);
283
284         return node;
285 }
286 EXPORT_SYMBOL(acpi_get_node);