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