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
pxm_to_node(int pxm)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
node_to_pxm(int node)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
__acpi_map_pxm_to_node(int pxm,int node)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
acpi_map_pxm_to_node(int pxm)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
acpi_table_print_srat_entry(struct acpi_subtable_header * header)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 default:
135 printk(KERN_WARNING PREFIX
136 "Found unsupported SRAT entry (type = 0x%x)\n",
137 header->type);
138 break;
139 }
140 }
141
142 /*
143 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
144 * up the NUMA heuristics which wants the local node to have a smaller
145 * distance than the others.
146 * Do some quick checks here and only use the SLIT if it passes.
147 */
slit_valid(struct acpi_table_slit * slit)148 static __init int slit_valid(struct acpi_table_slit *slit)
149 {
150 int i, j;
151 int d = slit->locality_count;
152 for (i = 0; i < d; i++) {
153 for (j = 0; j < d; j++) {
154 u8 val = slit->entry[d*i + j];
155 if (i == j) {
156 if (val != LOCAL_DISTANCE)
157 return 0;
158 } else if (val <= LOCAL_DISTANCE)
159 return 0;
160 }
161 }
162 return 1;
163 }
164
acpi_parse_slit(struct acpi_table_header * table)165 static int __init acpi_parse_slit(struct acpi_table_header *table)
166 {
167 struct acpi_table_slit *slit;
168
169 if (!table)
170 return -EINVAL;
171
172 slit = (struct acpi_table_slit *)table;
173
174 if (!slit_valid(slit)) {
175 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
176 return -EINVAL;
177 }
178 acpi_numa_slit_init(slit);
179
180 return 0;
181 }
182
183 static int __init
acpi_parse_processor_affinity(struct acpi_subtable_header * header,const unsigned long end)184 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
185 const unsigned long end)
186 {
187 struct acpi_srat_cpu_affinity *processor_affinity;
188
189 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
190 if (!processor_affinity)
191 return -EINVAL;
192
193 acpi_table_print_srat_entry(header);
194
195 /* let architecture-dependent part to do it */
196 acpi_numa_processor_affinity_init(processor_affinity);
197
198 return 0;
199 }
200
201 static int __init
acpi_parse_memory_affinity(struct acpi_subtable_header * header,const unsigned long end)202 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
203 const unsigned long end)
204 {
205 struct acpi_srat_mem_affinity *memory_affinity;
206
207 memory_affinity = (struct acpi_srat_mem_affinity *)header;
208 if (!memory_affinity)
209 return -EINVAL;
210
211 acpi_table_print_srat_entry(header);
212
213 /* let architecture-dependent part to do it */
214 acpi_numa_memory_affinity_init(memory_affinity);
215
216 return 0;
217 }
218
acpi_parse_srat(struct acpi_table_header * table)219 static int __init acpi_parse_srat(struct acpi_table_header *table)
220 {
221 struct acpi_table_srat *srat;
222
223 if (!table)
224 return -EINVAL;
225
226 srat = (struct acpi_table_srat *)table;
227
228 return 0;
229 }
230
231 static int __init
acpi_table_parse_srat(enum acpi_srat_type id,acpi_table_entry_handler handler,unsigned int max_entries)232 acpi_table_parse_srat(enum acpi_srat_type id,
233 acpi_table_entry_handler handler, unsigned int max_entries)
234 {
235 return acpi_table_parse_entries(ACPI_SIG_SRAT,
236 sizeof(struct acpi_table_srat), id,
237 handler, max_entries);
238 }
239
acpi_numa_init(void)240 int __init acpi_numa_init(void)
241 {
242 /* SRAT: Static Resource Affinity Table */
243 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
244 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
245 acpi_parse_processor_affinity, NR_CPUS);
246 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
247 acpi_parse_memory_affinity,
248 NR_NODE_MEMBLKS);
249 }
250
251 /* SLIT: System Locality Information Table */
252 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
253
254 acpi_numa_arch_fixup();
255 return 0;
256 }
257
acpi_get_pxm(acpi_handle h)258 int acpi_get_pxm(acpi_handle h)
259 {
260 unsigned long long pxm;
261 acpi_status status;
262 acpi_handle handle;
263 acpi_handle phandle = h;
264
265 do {
266 handle = phandle;
267 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
268 if (ACPI_SUCCESS(status))
269 return pxm;
270 status = acpi_get_parent(handle, &phandle);
271 } while (ACPI_SUCCESS(status));
272 return -1;
273 }
274
acpi_get_node(acpi_handle * handle)275 int acpi_get_node(acpi_handle *handle)
276 {
277 int pxm, node = -1;
278
279 pxm = acpi_get_pxm(handle);
280 if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
281 node = acpi_map_pxm_to_node(pxm);
282
283 return node;
284 }
285 EXPORT_SYMBOL(acpi_get_node);
286