Merge commit 'origin/master' into for-linus/xen/master
[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
33 #define ACPI_NUMA       0x80000000
34 #define _COMPONENT      ACPI_NUMA
35 ACPI_MODULE_NAME("numa");
36
37 static nodemask_t nodes_found_map = NODE_MASK_NONE;
38
39 /* maps to convert between proximity domain and logical node ID */
40 static int pxm_to_node_map[MAX_PXM_DOMAINS]
41                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
42 static int node_to_pxm_map[MAX_NUMNODES]
43                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
44
45 int pxm_to_node(int pxm)
46 {
47         if (pxm < 0)
48                 return NID_INVAL;
49         return pxm_to_node_map[pxm];
50 }
51
52 int node_to_pxm(int node)
53 {
54         if (node < 0)
55                 return PXM_INVAL;
56         return node_to_pxm_map[node];
57 }
58
59 void __acpi_map_pxm_to_node(int pxm, int node)
60 {
61         pxm_to_node_map[pxm] = node;
62         node_to_pxm_map[node] = pxm;
63 }
64
65 int acpi_map_pxm_to_node(int pxm)
66 {
67         int node = pxm_to_node_map[pxm];
68
69         if (node < 0){
70                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
71                         return NID_INVAL;
72                 node = first_unset_node(nodes_found_map);
73                 __acpi_map_pxm_to_node(pxm, node);
74                 node_set(node, nodes_found_map);
75         }
76
77         return node;
78 }
79
80 #if 0
81 void __cpuinit acpi_unmap_pxm_to_node(int node)
82 {
83         int pxm = node_to_pxm_map[node];
84         pxm_to_node_map[pxm] = NID_INVAL;
85         node_to_pxm_map[node] = PXM_INVAL;
86         node_clear(node, nodes_found_map);
87 }
88 #endif  /*  0  */
89
90 static void __init
91 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
92 {
93
94         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
95
96         if (!header)
97                 return;
98
99         switch (header->type) {
100
101         case ACPI_SRAT_TYPE_CPU_AFFINITY:
102 #ifdef ACPI_DEBUG_OUTPUT
103                 {
104                         struct acpi_srat_cpu_affinity *p =
105                             (struct acpi_srat_cpu_affinity *)header;
106                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
107                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
108                                           p->apic_id, p->local_sapic_eid,
109                                           p->proximity_domain_lo,
110                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
111                                           "enabled" : "disabled"));
112                 }
113 #endif                          /* ACPI_DEBUG_OUTPUT */
114                 break;
115
116         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
117 #ifdef ACPI_DEBUG_OUTPUT
118                 {
119                         struct acpi_srat_mem_affinity *p =
120                             (struct acpi_srat_mem_affinity *)header;
121                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
122                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
123                                           (unsigned long)p->base_address,
124                                           (unsigned long)p->length,
125                                           p->proximity_domain,
126                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
127                                           "enabled" : "disabled",
128                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
129                                           " hot-pluggable" : ""));
130                 }
131 #endif                          /* ACPI_DEBUG_OUTPUT */
132                 break;
133
134         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
135 #ifdef ACPI_DEBUG_OUTPUT
136                 {
137                         struct acpi_srat_x2apic_cpu_affinity *p =
138                             (struct acpi_srat_x2apic_cpu_affinity *)header;
139                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
140                                           "SRAT Processor (x2apicid[0x%08x]) in"
141                                           " proximity domain %d %s\n",
142                                           p->apic_id,
143                                           p->proximity_domain,
144                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
145                                           "enabled" : "disabled"));
146                 }
147 #endif                          /* ACPI_DEBUG_OUTPUT */
148                 break;
149         default:
150                 printk(KERN_WARNING PREFIX
151                        "Found unsupported SRAT entry (type = 0x%x)\n",
152                        header->type);
153                 break;
154         }
155 }
156
157 /*
158  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
159  * up the NUMA heuristics which wants the local node to have a smaller
160  * distance than the others.
161  * Do some quick checks here and only use the SLIT if it passes.
162  */
163 static __init int slit_valid(struct acpi_table_slit *slit)
164 {
165         int i, j;
166         int d = slit->locality_count;
167         for (i = 0; i < d; i++) {
168                 for (j = 0; j < d; j++)  {
169                         u8 val = slit->entry[d*i + j];
170                         if (i == j) {
171                                 if (val != LOCAL_DISTANCE)
172                                         return 0;
173                         } else if (val <= LOCAL_DISTANCE)
174                                 return 0;
175                 }
176         }
177         return 1;
178 }
179
180 static int __init acpi_parse_slit(struct acpi_table_header *table)
181 {
182         struct acpi_table_slit *slit;
183
184         if (!table)
185                 return -EINVAL;
186
187         slit = (struct acpi_table_slit *)table;
188
189         if (!slit_valid(slit)) {
190                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
191                 return -EINVAL;
192         }
193         acpi_numa_slit_init(slit);
194
195         return 0;
196 }
197
198 void __init __attribute__ ((weak))
199 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
200 {
201         printk(KERN_WARNING PREFIX
202                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
203         return;
204 }
205
206
207 static int __init
208 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
209                            const unsigned long end)
210 {
211         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
212
213         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
214         if (!processor_affinity)
215                 return -EINVAL;
216
217         acpi_table_print_srat_entry(header);
218
219         /* let architecture-dependent part to do it */
220         acpi_numa_x2apic_affinity_init(processor_affinity);
221
222         return 0;
223 }
224
225 static int __init
226 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
227                               const unsigned long end)
228 {
229         struct acpi_srat_cpu_affinity *processor_affinity;
230
231         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
232         if (!processor_affinity)
233                 return -EINVAL;
234
235         acpi_table_print_srat_entry(header);
236
237         /* let architecture-dependent part to do it */
238         acpi_numa_processor_affinity_init(processor_affinity);
239
240         return 0;
241 }
242
243 static int __init
244 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
245                            const unsigned long end)
246 {
247         struct acpi_srat_mem_affinity *memory_affinity;
248
249         memory_affinity = (struct acpi_srat_mem_affinity *)header;
250         if (!memory_affinity)
251                 return -EINVAL;
252
253         acpi_table_print_srat_entry(header);
254
255         /* let architecture-dependent part to do it */
256         acpi_numa_memory_affinity_init(memory_affinity);
257
258         return 0;
259 }
260
261 static int __init acpi_parse_srat(struct acpi_table_header *table)
262 {
263         struct acpi_table_srat *srat;
264
265         if (!table)
266                 return -EINVAL;
267
268         srat = (struct acpi_table_srat *)table;
269
270         return 0;
271 }
272
273 static int __init
274 acpi_table_parse_srat(enum acpi_srat_type id,
275                       acpi_table_entry_handler handler, unsigned int max_entries)
276 {
277         return acpi_table_parse_entries(ACPI_SIG_SRAT,
278                                             sizeof(struct acpi_table_srat), id,
279                                             handler, max_entries);
280 }
281
282 int __init acpi_numa_init(void)
283 {
284         /* SRAT: Static Resource Affinity Table */
285         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
286                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
287                                       acpi_parse_x2apic_affinity, NR_CPUS);
288                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
289                                       acpi_parse_processor_affinity, NR_CPUS);
290                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
291                                       acpi_parse_memory_affinity,
292                                       NR_NODE_MEMBLKS);
293         }
294
295         /* SLIT: System Locality Information Table */
296         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
297
298         acpi_numa_arch_fixup();
299         return 0;
300 }
301
302 int acpi_get_pxm(acpi_handle h)
303 {
304         unsigned long long pxm;
305         acpi_status status;
306         acpi_handle handle;
307         acpi_handle phandle = h;
308
309         do {
310                 handle = phandle;
311                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
312                 if (ACPI_SUCCESS(status))
313                         return pxm;
314                 status = acpi_get_parent(handle, &phandle);
315         } while (ACPI_SUCCESS(status));
316         return -1;
317 }
318
319 int acpi_get_node(acpi_handle *handle)
320 {
321         int pxm, node = -1;
322
323         pxm = acpi_get_pxm(handle);
324         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
325                 node = acpi_map_pxm_to_node(pxm);
326
327         return node;
328 }
329 EXPORT_SYMBOL(acpi_get_node);