tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36ACPI_MODULE_NAME("numa");
37
38static nodemask_t nodes_found_map = NODE_MASK_NONE;
39
40/* maps to convert between proximity domain and logical node ID */
41static int pxm_to_node_map[MAX_PXM_DOMAINS]
42 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
43static int node_to_pxm_map[MAX_NUMNODES]
44 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
45
46int pxm_to_node(int pxm)
47{
48 if (pxm < 0)
49 return NID_INVAL;
50 return pxm_to_node_map[pxm];
51}
52
53int node_to_pxm(int node)
54{
55 if (node < 0)
56 return PXM_INVAL;
57 return node_to_pxm_map[node];
58}
59
60void __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
66int 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
81void __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
89static void __init
90acpi_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
141static 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
159static int __init
160acpi_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
177static int __init
178acpi_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
195static 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
207static int __init
208acpi_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
216int __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
234int 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}
250EXPORT_SYMBOL(acpi_get_pxm);
251
252int 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}
262EXPORT_SYMBOL(acpi_get_node);