2 * acpi_numa.c - ACPI NUMA support
4 * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 <acpi/acpi_bus.h>
32 #include <acpi/acmacros.h>
34 #define ACPI_NUMA 0x80000000
35 #define _COMPONENT ACPI_NUMA
36 ACPI_MODULE_NAME("numa");
38 static nodemask_t nodes_found_map
= NODE_MASK_NONE
;
40 /* maps to convert between proximity domain and logical node ID */
41 static int pxm_to_node_map
[MAX_PXM_DOMAINS
]
42 = { [0 ... MAX_PXM_DOMAINS
- 1] = NID_INVAL
};
43 static int node_to_pxm_map
[MAX_NUMNODES
]
44 = { [0 ... MAX_NUMNODES
- 1] = PXM_INVAL
};
46 int pxm_to_node(int pxm
)
50 return pxm_to_node_map
[pxm
];
53 int node_to_pxm(int node
)
57 return node_to_pxm_map
[node
];
60 void __acpi_map_pxm_to_node(int pxm
, int node
)
62 pxm_to_node_map
[pxm
] = node
;
63 node_to_pxm_map
[node
] = pxm
;
66 int acpi_map_pxm_to_node(int pxm
)
68 int node
= pxm_to_node_map
[pxm
];
71 if (nodes_weight(nodes_found_map
) >= MAX_NUMNODES
)
73 node
= first_unset_node(nodes_found_map
);
74 __acpi_map_pxm_to_node(pxm
, node
);
75 node_set(node
, nodes_found_map
);
82 void __cpuinit
acpi_unmap_pxm_to_node(int node
)
84 int pxm
= node_to_pxm_map
[node
];
85 pxm_to_node_map
[pxm
] = NID_INVAL
;
86 node_to_pxm_map
[node
] = PXM_INVAL
;
87 node_clear(node
, nodes_found_map
);
92 acpi_table_print_srat_entry(struct acpi_subtable_header
*header
)
95 ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
100 switch (header
->type
) {
102 case ACPI_SRAT_TYPE_CPU_AFFINITY
:
103 #ifdef ACPI_DEBUG_OUTPUT
105 struct acpi_srat_cpu_affinity
*p
=
106 (struct acpi_srat_cpu_affinity
*)header
;
107 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
108 "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
109 p
->apic_id
, p
->local_sapic_eid
,
110 p
->proximity_domain_lo
,
111 (p
->flags
& ACPI_SRAT_CPU_ENABLED
)?
112 "enabled" : "disabled"));
114 #endif /* ACPI_DEBUG_OUTPUT */
117 case ACPI_SRAT_TYPE_MEMORY_AFFINITY
:
118 #ifdef ACPI_DEBUG_OUTPUT
120 struct acpi_srat_mem_affinity
*p
=
121 (struct acpi_srat_mem_affinity
*)header
;
122 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
123 "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
124 (unsigned long)p
->base_address
,
125 (unsigned long)p
->length
,
126 p
->memory_type
, p
->proximity_domain
,
127 (p
->flags
& ACPI_SRAT_MEM_ENABLED
)?
128 "enabled" : "disabled",
129 (p
->flags
& ACPI_SRAT_MEM_HOT_PLUGGABLE
)?
130 " hot-pluggable" : ""));
132 #endif /* ACPI_DEBUG_OUTPUT */
136 printk(KERN_WARNING PREFIX
137 "Found unsupported SRAT entry (type = 0x%x)\n",
144 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
145 * up the NUMA heuristics which wants the local node to have a smaller
146 * distance than the others.
147 * Do some quick checks here and only use the SLIT if it passes.
149 static __init
int slit_valid(struct acpi_table_slit
*slit
)
152 int d
= slit
->locality_count
;
153 for (i
= 0; i
< d
; i
++) {
154 for (j
= 0; j
< d
; j
++) {
155 u8 val
= slit
->entry
[d
*i
+ j
];
157 if (val
!= LOCAL_DISTANCE
)
159 } else if (val
<= LOCAL_DISTANCE
)
166 static int __init
acpi_parse_slit(struct acpi_table_header
*table
)
168 struct acpi_table_slit
*slit
;
173 slit
= (struct acpi_table_slit
*)table
;
175 if (!slit_valid(slit
)) {
176 printk(KERN_INFO
"ACPI: SLIT table looks invalid. Not used.\n");
179 acpi_numa_slit_init(slit
);
185 acpi_parse_processor_affinity(struct acpi_subtable_header
* header
,
186 const unsigned long end
)
188 struct acpi_srat_cpu_affinity
*processor_affinity
;
190 processor_affinity
= (struct acpi_srat_cpu_affinity
*)header
;
191 if (!processor_affinity
)
194 acpi_table_print_srat_entry(header
);
196 /* let architecture-dependent part to do it */
197 acpi_numa_processor_affinity_init(processor_affinity
);
203 acpi_parse_memory_affinity(struct acpi_subtable_header
* header
,
204 const unsigned long end
)
206 struct acpi_srat_mem_affinity
*memory_affinity
;
208 memory_affinity
= (struct acpi_srat_mem_affinity
*)header
;
209 if (!memory_affinity
)
212 acpi_table_print_srat_entry(header
);
214 /* let architecture-dependent part to do it */
215 acpi_numa_memory_affinity_init(memory_affinity
);
220 static int __init
acpi_parse_srat(struct acpi_table_header
*table
)
222 struct acpi_table_srat
*srat
;
227 srat
= (struct acpi_table_srat
*)table
;
233 acpi_table_parse_srat(enum acpi_srat_type id
,
234 acpi_table_entry_handler handler
, unsigned int max_entries
)
236 return acpi_table_parse_entries(ACPI_SIG_SRAT
,
237 sizeof(struct acpi_table_srat
), id
,
238 handler
, max_entries
);
241 int __init
acpi_numa_init(void)
243 /* SRAT: Static Resource Affinity Table */
244 if (!acpi_table_parse(ACPI_SIG_SRAT
, acpi_parse_srat
)) {
245 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY
,
246 acpi_parse_processor_affinity
, NR_CPUS
);
247 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY
,
248 acpi_parse_memory_affinity
,
252 /* SLIT: System Locality Information Table */
253 acpi_table_parse(ACPI_SIG_SLIT
, acpi_parse_slit
);
255 acpi_numa_arch_fixup();
259 int acpi_get_pxm(acpi_handle h
)
264 acpi_handle phandle
= h
;
268 status
= acpi_evaluate_integer(handle
, "_PXM", NULL
, &pxm
);
269 if (ACPI_SUCCESS(status
))
271 status
= acpi_get_parent(handle
, &phandle
);
272 } while (ACPI_SUCCESS(status
));
276 int acpi_get_node(acpi_handle
*handle
)
280 pxm
= acpi_get_pxm(handle
);
282 node
= acpi_map_pxm_to_node(pxm
);
286 EXPORT_SYMBOL(acpi_get_node
);