Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / numa.c
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
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
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
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
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
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\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                 }
128 #endif                          /* ACPI_DEBUG_OUTPUT */
129                 break;
130
131         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
132 #ifdef ACPI_DEBUG_OUTPUT
133                 {
134                         struct acpi_srat_x2apic_cpu_affinity *p =
135                             (struct acpi_srat_x2apic_cpu_affinity *)header;
136                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
137                                           "SRAT Processor (x2apicid[0x%08x]) in"
138                                           " proximity domain %d %s\n",
139                                           p->apic_id,
140                                           p->proximity_domain,
141                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
142                                           "enabled" : "disabled"));
143                 }
144 #endif                          /* ACPI_DEBUG_OUTPUT */
145                 break;
146         default:
147                 printk(KERN_WARNING PREFIX
148                        "Found unsupported SRAT entry (type = 0x%x)\n",
149                        header->type);
150                 break;
151         }
152 }
153
154 /*
155  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
156  * up the NUMA heuristics which wants the local node to have a smaller
157  * distance than the others.
158  * Do some quick checks here and only use the SLIT if it passes.
159  */
160 static __init int slit_valid(struct acpi_table_slit *slit)
161 {
162         int i, j;
163         int d = slit->locality_count;
164         for (i = 0; i < d; i++) {
165                 for (j = 0; j < d; j++)  {
166                         u8 val = slit->entry[d*i + j];
167                         if (i == j) {
168                                 if (val != LOCAL_DISTANCE)
169                                         return 0;
170                         } else if (val <= LOCAL_DISTANCE)
171                                 return 0;
172                 }
173         }
174         return 1;
175 }
176
177 static int __init acpi_parse_slit(struct acpi_table_header *table)
178 {
179         struct acpi_table_slit *slit;
180
181         if (!table)
182                 return -EINVAL;
183
184         slit = (struct acpi_table_slit *)table;
185
186         if (!slit_valid(slit)) {
187                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
188                 return -EINVAL;
189         }
190         acpi_numa_slit_init(slit);
191
192         return 0;
193 }
194
195 void __init __attribute__ ((weak))
196 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
197 {
198         printk(KERN_WARNING PREFIX
199                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
200         return;
201 }
202
203
204 static int __init
205 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
206                            const unsigned long end)
207 {
208         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
209
210         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
211         if (!processor_affinity)
212                 return -EINVAL;
213
214         acpi_table_print_srat_entry(header);
215
216         /* let architecture-dependent part to do it */
217         acpi_numa_x2apic_affinity_init(processor_affinity);
218
219         return 0;
220 }
221
222 static int __init
223 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
224                               const unsigned long end)
225 {
226         struct acpi_srat_cpu_affinity *processor_affinity;
227
228         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
229         if (!processor_affinity)
230                 return -EINVAL;
231
232         acpi_table_print_srat_entry(header);
233
234         /* let architecture-dependent part to do it */
235         acpi_numa_processor_affinity_init(processor_affinity);
236
237         return 0;
238 }
239
240 static int __init
241 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
242                            const unsigned long end)
243 {
244         struct acpi_srat_mem_affinity *memory_affinity;
245
246         memory_affinity = (struct acpi_srat_mem_affinity *)header;
247         if (!memory_affinity)
248                 return -EINVAL;
249
250         acpi_table_print_srat_entry(header);
251
252         /* let architecture-dependent part to do it */
253         acpi_numa_memory_affinity_init(memory_affinity);
254
255         return 0;
256 }
257
258 static int __init acpi_parse_srat(struct acpi_table_header *table)
259 {
260         struct acpi_table_srat *srat;
261         if (!table)
262                 return -EINVAL;
263
264         srat = (struct acpi_table_srat *)table;
265         acpi_srat_revision = srat->header.revision;
266
267         /* Real work done in acpi_table_parse_srat below. */
268
269         return 0;
270 }
271
272 static int __init
273 acpi_table_parse_srat(enum acpi_srat_type id,
274                       acpi_table_entry_handler handler, unsigned int max_entries)
275 {
276         return acpi_table_parse_entries(ACPI_SIG_SRAT,
277                                             sizeof(struct acpi_table_srat), id,
278                                             handler, max_entries);
279 }
280
281 int __init acpi_numa_init(void)
282 {
283         int cnt = 0;
284
285         /*
286          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
287          * SRAT cpu entries could have different order with that in MADT.
288          * So go over all cpu entries in SRAT to get apicid to node mapping.
289          */
290
291         /* SRAT: Static Resource Affinity Table */
292         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
293                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
294                                      acpi_parse_x2apic_affinity, 0);
295                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
296                                      acpi_parse_processor_affinity, 0);
297                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
298                                             acpi_parse_memory_affinity,
299                                             NR_NODE_MEMBLKS);
300         }
301
302         /* SLIT: System Locality Information Table */
303         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
304
305         acpi_numa_arch_fixup();
306
307         if (cnt <= 0)
308                 return cnt ?: -ENOENT;
309         return 0;
310 }
311
312 int acpi_get_pxm(acpi_handle h)
313 {
314         unsigned long long pxm;
315         acpi_status status;
316         acpi_handle handle;
317         acpi_handle phandle = h;
318
319         do {
320                 handle = phandle;
321                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
322                 if (ACPI_SUCCESS(status))
323                         return pxm;
324                 status = acpi_get_parent(handle, &phandle);
325         } while (ACPI_SUCCESS(status));
326         return -1;
327 }
328
329 int acpi_get_node(acpi_handle *handle)
330 {
331         int pxm, node = -1;
332
333         pxm = acpi_get_pxm(handle);
334         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
335                 node = acpi_map_pxm_to_node(pxm);
336
337         return node;
338 }
339 EXPORT_SYMBOL(acpi_get_node);