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