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 <linux/numa.h>
33 #define PREFIX "ACPI: "
35 #define ACPI_NUMA 0x80000000
36 #define _COMPONENT ACPI_NUMA
37 ACPI_MODULE_NAME("numa");
39 static nodemask_t nodes_found_map
= NODE_MASK_NONE
;
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
};
47 unsigned char acpi_srat_revision __initdata
;
49 int pxm_to_node(int pxm
)
53 return pxm_to_node_map
[pxm
];
56 int node_to_pxm(int node
)
60 return node_to_pxm_map
[node
];
63 static void __acpi_map_pxm_to_node(int pxm
, int node
)
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
;
71 int acpi_map_pxm_to_node(int pxm
)
73 int node
= pxm_to_node_map
[pxm
];
75 if (node
== NUMA_NO_NODE
) {
76 if (nodes_weight(nodes_found_map
) >= MAX_NUMNODES
)
78 node
= first_unset_node(nodes_found_map
);
79 __acpi_map_pxm_to_node(pxm
, node
);
80 node_set(node
, nodes_found_map
);
87 acpi_table_print_srat_entry(struct acpi_subtable_header
*header
)
90 ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
95 switch (header
->type
) {
97 case ACPI_SRAT_TYPE_CPU_AFFINITY
:
98 #ifdef ACPI_DEBUG_OUTPUT
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"));
109 #endif /* ACPI_DEBUG_OUTPUT */
112 case ACPI_SRAT_TYPE_MEMORY_AFFINITY
:
113 #ifdef ACPI_DEBUG_OUTPUT
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
,
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" : ""));
129 #endif /* ACPI_DEBUG_OUTPUT */
132 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY
:
133 #ifdef ACPI_DEBUG_OUTPUT
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",
142 (p
->flags
& ACPI_SRAT_CPU_ENABLED
) ?
143 "enabled" : "disabled"));
145 #endif /* ACPI_DEBUG_OUTPUT */
148 printk(KERN_WARNING PREFIX
149 "Found unsupported SRAT entry (type = 0x%x)\n",
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.
161 static int __init
slit_valid(struct acpi_table_slit
*slit
)
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
];
169 if (val
!= LOCAL_DISTANCE
)
171 } else if (val
<= LOCAL_DISTANCE
)
178 static int __init
acpi_parse_slit(struct acpi_table_header
*table
)
180 struct acpi_table_slit
*slit
= (struct acpi_table_slit
*)table
;
182 if (!slit_valid(slit
)) {
183 printk(KERN_INFO
"ACPI: SLIT table looks invalid. Not used.\n");
186 acpi_numa_slit_init(slit
);
192 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity
*pa
)
194 printk(KERN_WARNING PREFIX
195 "Found unsupported x2apic [0x%08x] SRAT entry\n", pa
->apic_id
);
201 acpi_parse_x2apic_affinity(struct acpi_subtable_header
*header
,
202 const unsigned long end
)
204 struct acpi_srat_x2apic_cpu_affinity
*processor_affinity
;
206 processor_affinity
= (struct acpi_srat_x2apic_cpu_affinity
*)header
;
207 if (!processor_affinity
)
210 acpi_table_print_srat_entry(header
);
212 /* let architecture-dependent part to do it */
213 acpi_numa_x2apic_affinity_init(processor_affinity
);
219 acpi_parse_processor_affinity(struct acpi_subtable_header
*header
,
220 const unsigned long end
)
222 struct acpi_srat_cpu_affinity
*processor_affinity
;
224 processor_affinity
= (struct acpi_srat_cpu_affinity
*)header
;
225 if (!processor_affinity
)
228 acpi_table_print_srat_entry(header
);
230 /* let architecture-dependent part to do it */
231 acpi_numa_processor_affinity_init(processor_affinity
);
236 static int __initdata parsed_numa_memblks
;
239 acpi_parse_memory_affinity(struct acpi_subtable_header
* header
,
240 const unsigned long end
)
242 struct acpi_srat_mem_affinity
*memory_affinity
;
244 memory_affinity
= (struct acpi_srat_mem_affinity
*)header
;
245 if (!memory_affinity
)
248 acpi_table_print_srat_entry(header
);
250 /* let architecture-dependent part to do it */
251 if (!acpi_numa_memory_affinity_init(memory_affinity
))
252 parsed_numa_memblks
++;
256 static int __init
acpi_parse_srat(struct acpi_table_header
*table
)
258 struct acpi_table_srat
*srat
= (struct acpi_table_srat
*)table
;
260 acpi_srat_revision
= srat
->header
.revision
;
262 /* Real work done in acpi_table_parse_srat below. */
268 acpi_table_parse_srat(enum acpi_srat_type id
,
269 acpi_tbl_entry_handler handler
, unsigned int max_entries
)
271 return acpi_table_parse_entries(ACPI_SIG_SRAT
,
272 sizeof(struct acpi_table_srat
), id
,
273 handler
, max_entries
);
276 int __init
acpi_numa_init(void)
281 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
282 * SRAT cpu entries could have different order with that in MADT.
283 * So go over all cpu entries in SRAT to get apicid to node mapping.
286 /* SRAT: Static Resource Affinity Table */
287 if (!acpi_table_parse(ACPI_SIG_SRAT
, acpi_parse_srat
)) {
288 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY
,
289 acpi_parse_x2apic_affinity
, 0);
290 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY
,
291 acpi_parse_processor_affinity
, 0);
292 cnt
= acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY
,
293 acpi_parse_memory_affinity
,
297 /* SLIT: System Locality Information Table */
298 acpi_table_parse(ACPI_SIG_SLIT
, acpi_parse_slit
);
300 acpi_numa_arch_fixup();
304 else if (!parsed_numa_memblks
)
309 static int acpi_get_pxm(acpi_handle h
)
311 unsigned long long pxm
;
314 acpi_handle phandle
= h
;
318 status
= acpi_evaluate_integer(handle
, "_PXM", NULL
, &pxm
);
319 if (ACPI_SUCCESS(status
))
321 status
= acpi_get_parent(handle
, &phandle
);
322 } while (ACPI_SUCCESS(status
));
326 int acpi_get_node(acpi_handle handle
)
330 pxm
= acpi_get_pxm(handle
);
331 if (pxm
< 0 || pxm
>= MAX_PXM_DOMAINS
)
334 return acpi_map_pxm_to_node(pxm
);
336 EXPORT_SYMBOL(acpi_get_node
);