x86_64: fake pxm-to-node mapping for fake numa
[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
40 /* maps to convert between proximity domain and logical node ID */
41 static int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
42                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
43 static int __cpuinitdata 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 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
89 static void __init
90 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
91 {
92
93         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
94
95         if (!header)
96                 return;
97
98         switch (header->type) {
99
100         case ACPI_SRAT_TYPE_CPU_AFFINITY:
101 #ifdef ACPI_DEBUG_OUTPUT
102                 {
103                         struct acpi_srat_cpu_affinity *p =
104                             (struct acpi_srat_cpu_affinity *)header;
105                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
106                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
107                                           p->apic_id, p->local_sapic_eid,
108                                           p->proximity_domain_lo,
109                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
110                                           "enabled" : "disabled"));
111                 }
112 #endif                          /* ACPI_DEBUG_OUTPUT */
113                 break;
114
115         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
116 #ifdef ACPI_DEBUG_OUTPUT
117                 {
118                         struct acpi_srat_mem_affinity *p =
119                             (struct acpi_srat_mem_affinity *)header;
120                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
121                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
122                                           (unsigned long)p->base_address,
123                                           (unsigned long)p->length,
124                                           p->memory_type, p->proximity_domain,
125                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
126                                           "enabled" : "disabled",
127                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
128                                           " hot-pluggable" : ""));
129                 }
130 #endif                          /* ACPI_DEBUG_OUTPUT */
131                 break;
132
133         default:
134                 printk(KERN_WARNING PREFIX
135                        "Found unsupported SRAT entry (type = 0x%x)\n",
136                        header->type);
137                 break;
138         }
139 }
140
141 static int __init acpi_parse_slit(struct acpi_table_header *table)
142 {
143         struct acpi_table_slit *slit;
144         u32 localities;
145
146         if (!table)
147                 return -EINVAL;
148
149         slit = (struct acpi_table_slit *)table;
150
151         /* downcast just for %llu vs %lu for i386/ia64  */
152         localities = (u32) slit->locality_count;
153
154         acpi_numa_slit_init(slit);
155
156         return 0;
157 }
158
159 static int __init
160 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
161                               const unsigned long end)
162 {
163         struct acpi_srat_cpu_affinity *processor_affinity;
164
165         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
166         if (!processor_affinity)
167                 return -EINVAL;
168
169         acpi_table_print_srat_entry(header);
170
171         /* let architecture-dependent part to do it */
172         acpi_numa_processor_affinity_init(processor_affinity);
173
174         return 0;
175 }
176
177 static int __init
178 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
179                            const unsigned long end)
180 {
181         struct acpi_srat_mem_affinity *memory_affinity;
182
183         memory_affinity = (struct acpi_srat_mem_affinity *)header;
184         if (!memory_affinity)
185                 return -EINVAL;
186
187         acpi_table_print_srat_entry(header);
188
189         /* let architecture-dependent part to do it */
190         acpi_numa_memory_affinity_init(memory_affinity);
191
192         return 0;
193 }
194
195 static int __init acpi_parse_srat(struct acpi_table_header *table)
196 {
197         struct acpi_table_srat *srat;
198
199         if (!table)
200                 return -EINVAL;
201
202         srat = (struct acpi_table_srat *)table;
203
204         return 0;
205 }
206
207 static int __init
208 acpi_table_parse_srat(enum acpi_srat_type id,
209                       acpi_table_entry_handler handler, unsigned int max_entries)
210 {
211         return acpi_table_parse_entries(ACPI_SIG_SRAT,
212                                             sizeof(struct acpi_table_srat), id,
213                                             handler, max_entries);
214 }
215
216 int __init acpi_numa_init(void)
217 {
218         /* SRAT: Static Resource Affinity Table */
219         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
220                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
221                                       acpi_parse_processor_affinity, NR_CPUS);
222                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
223                                       acpi_parse_memory_affinity,
224                                       NR_NODE_MEMBLKS);
225         }
226
227         /* SLIT: System Locality Information Table */
228         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
229
230         acpi_numa_arch_fixup();
231         return 0;
232 }
233
234 int acpi_get_pxm(acpi_handle h)
235 {
236         unsigned long pxm;
237         acpi_status status;
238         acpi_handle handle;
239         acpi_handle phandle = h;
240
241         do {
242                 handle = phandle;
243                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
244                 if (ACPI_SUCCESS(status))
245                         return pxm;
246                 status = acpi_get_parent(handle, &phandle);
247         } while (ACPI_SUCCESS(status));
248         return -1;
249 }
250 EXPORT_SYMBOL(acpi_get_pxm);
251
252 int acpi_get_node(acpi_handle *handle)
253 {
254         int pxm, node = -1;
255
256         pxm = acpi_get_pxm(handle);
257         if (pxm >= 0)
258                 node = acpi_map_pxm_to_node(pxm);
259
260         return node;
261 }
262 EXPORT_SYMBOL(acpi_get_node);