Merge branch 'acpi-assorted'
[~shefty/rdma-dev.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%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  */
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
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))
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
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
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
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
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
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
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
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
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);