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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 __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
44                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
45 static int __cpuinitdata 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 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 static void __init
87 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
88 {
89
90         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
91
92         if (!header)
93                 return;
94
95         switch (header->type) {
96
97         case ACPI_SRAT_TYPE_CPU_AFFINITY:
98 #ifdef ACPI_DEBUG_OUTPUT
99                 {
100                         struct acpi_srat_cpu_affinity *p =
101                             (struct acpi_srat_cpu_affinity *)header;
102                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
103                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
104                                           p->apic_id, p->local_sapic_eid,
105                                           p->proximity_domain_lo,
106                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
107                                           "enabled" : "disabled"));
108                 }
109 #endif                          /* ACPI_DEBUG_OUTPUT */
110                 break;
111
112         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
113 #ifdef ACPI_DEBUG_OUTPUT
114                 {
115                         struct acpi_srat_mem_affinity *p =
116                             (struct acpi_srat_mem_affinity *)header;
117                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
118                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
119                                           (unsigned long)p->base_address,
120                                           (unsigned long)p->length,
121                                           p->memory_type, p->proximity_domain,
122                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
123                                           "enabled" : "disabled",
124                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
125                                           " hot-pluggable" : ""));
126                 }
127 #endif                          /* ACPI_DEBUG_OUTPUT */
128                 break;
129
130         default:
131                 printk(KERN_WARNING PREFIX
132                        "Found unsupported SRAT entry (type = 0x%x)\n",
133                        header->type);
134                 break;
135         }
136 }
137
138 static int __init acpi_parse_slit(struct acpi_table_header *table)
139 {
140         struct acpi_table_slit *slit;
141         u32 localities;
142
143         if (!table)
144                 return -EINVAL;
145
146         slit = (struct acpi_table_slit *)table;
147
148         /* downcast just for %llu vs %lu for i386/ia64  */
149         localities = (u32) slit->locality_count;
150
151         acpi_numa_slit_init(slit);
152
153         return 0;
154 }
155
156 static int __init
157 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
158                               const unsigned long end)
159 {
160         struct acpi_srat_cpu_affinity *processor_affinity;
161
162         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
163         if (!processor_affinity)
164                 return -EINVAL;
165
166         acpi_table_print_srat_entry(header);
167
168         /* let architecture-dependent part to do it */
169         acpi_numa_processor_affinity_init(processor_affinity);
170
171         return 0;
172 }
173
174 static int __init
175 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
176                            const unsigned long end)
177 {
178         struct acpi_srat_mem_affinity *memory_affinity;
179
180         memory_affinity = (struct acpi_srat_mem_affinity *)header;
181         if (!memory_affinity)
182                 return -EINVAL;
183
184         acpi_table_print_srat_entry(header);
185
186         /* let architecture-dependent part to do it */
187         acpi_numa_memory_affinity_init(memory_affinity);
188
189         return 0;
190 }
191
192 static int __init acpi_parse_srat(struct acpi_table_header *table)
193 {
194         struct acpi_table_srat *srat;
195
196         if (!table)
197                 return -EINVAL;
198
199         srat = (struct acpi_table_srat *)table;
200
201         return 0;
202 }
203
204 static int __init
205 acpi_table_parse_srat(enum acpi_srat_type id,
206                       acpi_table_entry_handler handler, unsigned int max_entries)
207 {
208         return acpi_table_parse_entries(ACPI_SIG_SRAT,
209                                             sizeof(struct acpi_table_srat), id,
210                                             handler, max_entries);
211 }
212
213 int __init acpi_numa_init(void)
214 {
215         /* SRAT: Static Resource Affinity Table */
216         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
217                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
218                                       acpi_parse_processor_affinity, NR_CPUS);
219                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
220                                       acpi_parse_memory_affinity,
221                                       NR_NODE_MEMBLKS);
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);