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 <linux/numa.h>
32 #include <acpi/acpi_bus.h>
33
34 #define PREFIX "ACPI: "
35
36 #define ACPI_NUMA 0x80000000
37 #define _COMPONENT ACPI_NUMA
38 ACPI_MODULE_NAME("numa");
39
40 static nodemask_t nodes_found_map = NODE_MASK_NONE;
41
42 /* maps to convert between proximity domain and logical node ID */
43 static int pxm_to_node_map[MAX_PXM_DOMAINS]
44 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
45 static int node_to_pxm_map[MAX_NUMNODES]
46 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
47
48 unsigned char acpi_srat_revision __initdata;
49
pxm_to_node(int pxm)50 int pxm_to_node(int pxm)
51 {
52 if (pxm < 0)
53 return NUMA_NO_NODE;
54 return pxm_to_node_map[pxm];
55 }
56
node_to_pxm(int node)57 int node_to_pxm(int node)
58 {
59 if (node < 0)
60 return PXM_INVAL;
61 return node_to_pxm_map[node];
62 }
63
__acpi_map_pxm_to_node(int pxm,int node)64 void __acpi_map_pxm_to_node(int pxm, int node)
65 {
66 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
67 pxm_to_node_map[pxm] = node;
68 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
69 node_to_pxm_map[node] = pxm;
70 }
71
acpi_map_pxm_to_node(int pxm)72 int acpi_map_pxm_to_node(int pxm)
73 {
74 int node = pxm_to_node_map[pxm];
75
76 if (node < 0) {
77 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
78 return NUMA_NO_NODE;
79 node = first_unset_node(nodes_found_map);
80 __acpi_map_pxm_to_node(pxm, node);
81 node_set(node, nodes_found_map);
82 }
83
84 return node;
85 }
86
87 static void __init
acpi_table_print_srat_entry(struct acpi_subtable_header * header)88 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
89 {
90
91 ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
92
93 if (!header)
94 return;
95
96 switch (header->type) {
97
98 case ACPI_SRAT_TYPE_CPU_AFFINITY:
99 #ifdef ACPI_DEBUG_OUTPUT
100 {
101 struct acpi_srat_cpu_affinity *p =
102 (struct acpi_srat_cpu_affinity *)header;
103 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
104 "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
105 p->apic_id, p->local_sapic_eid,
106 p->proximity_domain_lo,
107 (p->flags & ACPI_SRAT_CPU_ENABLED)?
108 "enabled" : "disabled"));
109 }
110 #endif /* ACPI_DEBUG_OUTPUT */
111 break;
112
113 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
114 #ifdef ACPI_DEBUG_OUTPUT
115 {
116 struct acpi_srat_mem_affinity *p =
117 (struct acpi_srat_mem_affinity *)header;
118 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
119 "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
120 (unsigned long)p->base_address,
121 (unsigned long)p->length,
122 p->proximity_domain,
123 (p->flags & ACPI_SRAT_MEM_ENABLED)?
124 "enabled" : "disabled",
125 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
126 " hot-pluggable" : "",
127 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
128 " non-volatile" : ""));
129 }
130 #endif /* ACPI_DEBUG_OUTPUT */
131 break;
132
133 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
134 #ifdef ACPI_DEBUG_OUTPUT
135 {
136 struct acpi_srat_x2apic_cpu_affinity *p =
137 (struct acpi_srat_x2apic_cpu_affinity *)header;
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
139 "SRAT Processor (x2apicid[0x%08x]) in"
140 " proximity domain %d %s\n",
141 p->apic_id,
142 p->proximity_domain,
143 (p->flags & ACPI_SRAT_CPU_ENABLED) ?
144 "enabled" : "disabled"));
145 }
146 #endif /* ACPI_DEBUG_OUTPUT */
147 break;
148 default:
149 printk(KERN_WARNING PREFIX
150 "Found unsupported SRAT entry (type = 0x%x)\n",
151 header->type);
152 break;
153 }
154 }
155
156 /*
157 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
158 * up the NUMA heuristics which wants the local node to have a smaller
159 * distance than the others.
160 * Do some quick checks here and only use the SLIT if it passes.
161 */
slit_valid(struct acpi_table_slit * slit)162 static __init int slit_valid(struct acpi_table_slit *slit)
163 {
164 int i, j;
165 int d = slit->locality_count;
166 for (i = 0; i < d; i++) {
167 for (j = 0; j < d; j++) {
168 u8 val = slit->entry[d*i + j];
169 if (i == j) {
170 if (val != LOCAL_DISTANCE)
171 return 0;
172 } else if (val <= LOCAL_DISTANCE)
173 return 0;
174 }
175 }
176 return 1;
177 }
178
acpi_parse_slit(struct acpi_table_header * table)179 static int __init acpi_parse_slit(struct acpi_table_header *table)
180 {
181 struct acpi_table_slit *slit;
182
183 if (!table)
184 return -EINVAL;
185
186 slit = (struct acpi_table_slit *)table;
187
188 if (!slit_valid(slit)) {
189 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
190 return -EINVAL;
191 }
192 acpi_numa_slit_init(slit);
193
194 return 0;
195 }
196
197 void __init __attribute__ ((weak))
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity * pa)198 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
199 {
200 printk(KERN_WARNING PREFIX
201 "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
202 return;
203 }
204
205
206 static int __init
acpi_parse_x2apic_affinity(struct acpi_subtable_header * header,const unsigned long end)207 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
208 const unsigned long end)
209 {
210 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
211
212 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
213 if (!processor_affinity)
214 return -EINVAL;
215
216 acpi_table_print_srat_entry(header);
217
218 /* let architecture-dependent part to do it */
219 acpi_numa_x2apic_affinity_init(processor_affinity);
220
221 return 0;
222 }
223
224 static int __init
acpi_parse_processor_affinity(struct acpi_subtable_header * header,const unsigned long end)225 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
226 const unsigned long end)
227 {
228 struct acpi_srat_cpu_affinity *processor_affinity;
229
230 processor_affinity = (struct acpi_srat_cpu_affinity *)header;
231 if (!processor_affinity)
232 return -EINVAL;
233
234 acpi_table_print_srat_entry(header);
235
236 /* let architecture-dependent part to do it */
237 acpi_numa_processor_affinity_init(processor_affinity);
238
239 return 0;
240 }
241
242 static int __initdata parsed_numa_memblks;
243
244 static int __init
acpi_parse_memory_affinity(struct acpi_subtable_header * header,const unsigned long end)245 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
246 const unsigned long end)
247 {
248 struct acpi_srat_mem_affinity *memory_affinity;
249
250 memory_affinity = (struct acpi_srat_mem_affinity *)header;
251 if (!memory_affinity)
252 return -EINVAL;
253
254 acpi_table_print_srat_entry(header);
255
256 /* let architecture-dependent part to do it */
257 if (!acpi_numa_memory_affinity_init(memory_affinity))
258 parsed_numa_memblks++;
259 return 0;
260 }
261
acpi_parse_srat(struct acpi_table_header * table)262 static int __init acpi_parse_srat(struct acpi_table_header *table)
263 {
264 struct acpi_table_srat *srat;
265 if (!table)
266 return -EINVAL;
267
268 srat = (struct acpi_table_srat *)table;
269 acpi_srat_revision = srat->header.revision;
270
271 /* Real work done in acpi_table_parse_srat below. */
272
273 return 0;
274 }
275
276 static int __init
acpi_table_parse_srat(enum acpi_srat_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)277 acpi_table_parse_srat(enum acpi_srat_type id,
278 acpi_tbl_entry_handler handler, unsigned int max_entries)
279 {
280 return acpi_table_parse_entries(ACPI_SIG_SRAT,
281 sizeof(struct acpi_table_srat), id,
282 handler, max_entries);
283 }
284
acpi_numa_init(void)285 int __init acpi_numa_init(void)
286 {
287 int cnt = 0;
288
289 /*
290 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
291 * SRAT cpu entries could have different order with that in MADT.
292 * So go over all cpu entries in SRAT to get apicid to node mapping.
293 */
294
295 /* SRAT: Static Resource Affinity Table */
296 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
297 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
298 acpi_parse_x2apic_affinity, 0);
299 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
300 acpi_parse_processor_affinity, 0);
301 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
302 acpi_parse_memory_affinity,
303 NR_NODE_MEMBLKS);
304 }
305
306 /* SLIT: System Locality Information Table */
307 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
308
309 acpi_numa_arch_fixup();
310
311 if (cnt < 0)
312 return cnt;
313 else if (!parsed_numa_memblks)
314 return -ENOENT;
315 return 0;
316 }
317
acpi_get_pxm(acpi_handle h)318 int acpi_get_pxm(acpi_handle h)
319 {
320 unsigned long long pxm;
321 acpi_status status;
322 acpi_handle handle;
323 acpi_handle phandle = h;
324
325 do {
326 handle = phandle;
327 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
328 if (ACPI_SUCCESS(status))
329 return pxm;
330 status = acpi_get_parent(handle, &phandle);
331 } while (ACPI_SUCCESS(status));
332 return -1;
333 }
334
acpi_get_node(acpi_handle * handle)335 int acpi_get_node(acpi_handle *handle)
336 {
337 int pxm, node = -1;
338
339 pxm = acpi_get_pxm(handle);
340 if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
341 node = acpi_map_pxm_to_node(pxm);
342
343 return node;
344 }
345 EXPORT_SYMBOL(acpi_get_node);
346