bb6caab243220ea77860fed189fa7783834a30f8
[sfrench/cifs-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 int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
44                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
45 int __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
46                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
47
48 extern int __init acpi_table_parse_madt_family(char *id,
49                                                unsigned long madt_size,
50                                                int entry_id,
51                                                acpi_madt_entry_handler handler,
52                                                unsigned int max_entries);
53
54 int __cpuinit pxm_to_node(int pxm)
55 {
56         if (pxm < 0)
57                 return NID_INVAL;
58         return pxm_to_node_map[pxm];
59 }
60
61 int __cpuinit node_to_pxm(int node)
62 {
63         if (node < 0)
64                 return PXM_INVAL;
65         return node_to_pxm_map[node];
66 }
67
68 int __cpuinit 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 NID_INVAL;
75                 node = first_unset_node(nodes_found_map);
76                 pxm_to_node_map[pxm] = node;
77                 node_to_pxm_map[node] = pxm;
78                 node_set(node, nodes_found_map);
79         }
80
81         return node;
82 }
83
84 void __cpuinit acpi_unmap_pxm_to_node(int node)
85 {
86         int pxm = node_to_pxm_map[node];
87         pxm_to_node_map[pxm] = NID_INVAL;
88         node_to_pxm_map[node] = PXM_INVAL;
89         node_clear(node, nodes_found_map);
90 }
91
92 void __init 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 static int __init acpi_parse_slit(struct acpi_table_header *table)
144 {
145         struct acpi_table_slit *slit;
146         u32 localities;
147
148         if (!table)
149                 return -EINVAL;
150
151         slit = (struct acpi_table_slit *)table;
152
153         /* downcast just for %llu vs %lu for i386/ia64  */
154         localities = (u32) slit->locality_count;
155
156         acpi_numa_slit_init(slit);
157
158         return 0;
159 }
160
161 static int __init
162 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
163                               const unsigned long end)
164 {
165         struct acpi_srat_cpu_affinity *processor_affinity;
166
167         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
168         if (!processor_affinity)
169                 return -EINVAL;
170
171         acpi_table_print_srat_entry(header);
172
173         /* let architecture-dependent part to do it */
174         acpi_numa_processor_affinity_init(processor_affinity);
175
176         return 0;
177 }
178
179 static int __init
180 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
181                            const unsigned long end)
182 {
183         struct acpi_srat_mem_affinity *memory_affinity;
184
185         memory_affinity = (struct acpi_srat_mem_affinity *)header;
186         if (!memory_affinity)
187                 return -EINVAL;
188
189         acpi_table_print_srat_entry(header);
190
191         /* let architecture-dependent part to do it */
192         acpi_numa_memory_affinity_init(memory_affinity);
193
194         return 0;
195 }
196
197 static int __init acpi_parse_srat(struct acpi_table_header *table)
198 {
199         struct acpi_table_srat *srat;
200
201         if (!table)
202                 return -EINVAL;
203
204         srat = (struct acpi_table_srat *)table;
205
206         return 0;
207 }
208
209 int __init
210 acpi_table_parse_srat(enum acpi_srat_type id,
211                       acpi_madt_entry_handler handler, unsigned int max_entries)
212 {
213         return acpi_table_parse_madt_family(ACPI_SIG_SRAT,
214                                             sizeof(struct acpi_table_srat), id,
215                                             handler, max_entries);
216 }
217
218 int __init acpi_numa_init(void)
219 {
220         int result;
221
222         /* SRAT: Static Resource Affinity Table */
223         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
224                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
225                                                acpi_parse_processor_affinity,
226                                                NR_CPUS);
227                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, acpi_parse_memory_affinity, NR_NODE_MEMBLKS);    // IA64 specific
228         }
229
230         /* SLIT: System Locality Information Table */
231         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
232
233         acpi_numa_arch_fixup();
234         return 0;
235 }
236
237 int acpi_get_pxm(acpi_handle h)
238 {
239         unsigned long pxm;
240         acpi_status status;
241         acpi_handle handle;
242         acpi_handle phandle = h;
243
244         do {
245                 handle = phandle;
246                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
247                 if (ACPI_SUCCESS(status))
248                         return pxm;
249                 status = acpi_get_parent(handle, &phandle);
250         } while (ACPI_SUCCESS(status));
251         return -1;
252 }
253 EXPORT_SYMBOL(acpi_get_pxm);
254
255 int acpi_get_node(acpi_handle *handle)
256 {
257         int pxm, node = -1;
258
259         pxm = acpi_get_pxm(handle);
260         if (pxm >= 0)
261                 node = acpi_map_pxm_to_node(pxm);
262
263         return node;
264 }
265 EXPORT_SYMBOL(acpi_get_node);