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 <acpi/acpi_bus.h>
  32 #include <acpi/acmacros.h>
  33
  34 #define ACPI_NUMA       0x80000000
  35 #define _COMPONENT      ACPI_NUMA
  36 ACPI_MODULE_NAME("numa")
  37
  38 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  39 #define PXM_INVAL       -1
  40 #define NID_INVAL       -1
  41
  42 /* maps to convert between proximity domain and logical node ID */
  43 int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
  44                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
  45 int __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
  46                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  47
  48 extern int __init acpi_table_parse_madt_family(enum acpi_table_id id,
  49                                                unsigned long madt_size,
  50                                                int entry_id,
  51                                                acpi_madt_entry_handler handler,
  52                                                unsigned int max_entries);
  53
  54 int __cpuinit pxm_to_node(int pxm)
  55 {
  56         if (pxm < 0)
  57                 return NID_INVAL;
  58         return pxm_to_node_map[pxm];
  59 }
  60
  61 int __cpuinit node_to_pxm(int node)
  62 {
  63         if (node < 0)
  64                 return PXM_INVAL;
  65         return node_to_pxm_map[node];
  66 }
  67
  68 int __cpuinit acpi_map_pxm_to_node(int pxm)
  69 {
  70         int node = pxm_to_node_map[pxm];
  71
  72         if (node < 0){
  73                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  74                         return NID_INVAL;
  75                 node = first_unset_node(nodes_found_map);
  76                 pxm_to_node_map[pxm] = node;
  77                 node_to_pxm_map[node] = pxm;
  78                 node_set(node, nodes_found_map);
  79         }
  80
  81         return node;
  82 }
  83
  84 void __cpuinit acpi_unmap_pxm_to_node(int node)
  85 {
  86         int pxm = node_to_pxm_map[node];
  87         pxm_to_node_map[pxm] = NID_INVAL;
  88         node_to_pxm_map[node] = PXM_INVAL;
  89         node_clear(node, nodes_found_map);
  90 }
  91
  92 void __init acpi_table_print_srat_entry(acpi_table_entry_header * header)
  93 {
  94
  95         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  96
  97         if (!header)
  98                 return;
  99
 100         switch (header->type) {
 101
 102         case ACPI_SRAT_PROCESSOR_AFFINITY:
 103 #ifdef ACPI_DEBUG_OUTPUT
 104                 {
 105                         struct acpi_table_processor_affinity *p =
 106                             (struct acpi_table_processor_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->lsapic_eid,
 110                                           p->proximity_domain,
 111                                           p->flags.
 112                                           enabled ? "enabled" : "disabled"));
 113                 }
 114 #endif                          /* ACPI_DEBUG_OUTPUT */
 115                 break;
 116
 117         case ACPI_SRAT_MEMORY_AFFINITY:
 118 #ifdef ACPI_DEBUG_OUTPUT
 119                 {
 120                         struct acpi_table_memory_affinity *p =
 121                             (struct acpi_table_memory_affinity *)header;
 122                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 123                                           "SRAT Memory (0x%08x%08x length 0x%08x%08x type 0x%x) in proximity domain %d %s%s\n",
 124                                           p->base_addr_hi, p->base_addr_lo,
 125                                           p->length_hi, p->length_lo,
 126                                           p->memory_type, p->proximity_domain,
 127                                           p->flags.
 128                                           enabled ? "enabled" : "disabled",
 129                                           p->flags.
 130                                           hot_pluggable ? " hot-pluggable" :
 131                                           ""));
 132                 }
 133 #endif                          /* ACPI_DEBUG_OUTPUT */
 134                 break;
 135
 136         default:
 137                 printk(KERN_WARNING PREFIX
 138                        "Found unsupported SRAT entry (type = 0x%x)\n",
 139                        header->type);
 140                 break;
 141         }
 142 }
 143
 144 static int __init acpi_parse_slit(unsigned long phys_addr, unsigned long size)
 145 {
 146         struct acpi_table_slit *slit;
 147         u32 localities;
 148
 149         if (!phys_addr || !size)
 150                 return -EINVAL;
 151
 152         slit = (struct acpi_table_slit *)__va(phys_addr);
 153
 154         /* downcast just for %llu vs %lu for i386/ia64  */
 155         localities = (u32) slit->localities;
 156
 157         acpi_numa_slit_init(slit);
 158
 159         return 0;
 160 }
 161
 162 static int __init
 163 acpi_parse_processor_affinity(acpi_table_entry_header * header,
 164                               const unsigned long end)
 165 {
 166         struct acpi_table_processor_affinity *processor_affinity;
 167
 168         processor_affinity = (struct acpi_table_processor_affinity *)header;
 169         if (!processor_affinity)
 170                 return -EINVAL;
 171
 172         acpi_table_print_srat_entry(header);
 173
 174         /* let architecture-dependent part to do it */
 175         acpi_numa_processor_affinity_init(processor_affinity);
 176
 177         return 0;
 178 }
 179
 180 static int __init
 181 acpi_parse_memory_affinity(acpi_table_entry_header * header,
 182                            const unsigned long end)
 183 {
 184         struct acpi_table_memory_affinity *memory_affinity;
 185
 186         memory_affinity = (struct acpi_table_memory_affinity *)header;
 187         if (!memory_affinity)
 188                 return -EINVAL;
 189
 190         acpi_table_print_srat_entry(header);
 191
 192         /* let architecture-dependent part to do it */
 193         acpi_numa_memory_affinity_init(memory_affinity);
 194
 195         return 0;
 196 }
 197
 198 static int __init acpi_parse_srat(unsigned long phys_addr, unsigned long size)
 199 {
 200         struct acpi_table_srat *srat;
 201
 202         if (!phys_addr || !size)
 203                 return -EINVAL;
 204
 205         srat = (struct acpi_table_srat *)__va(phys_addr);
 206
 207         return 0;
 208 }
 209
 210 int __init
 211 acpi_table_parse_srat(enum acpi_srat_entry_id id,
 212                       acpi_madt_entry_handler handler, unsigned int max_entries)
 213 {
 214         return acpi_table_parse_madt_family(ACPI_SRAT,
 215                                             sizeof(struct acpi_table_srat), id,
 216                                             handler, max_entries);
 217 }
 218
 219 int __init acpi_numa_init(void)
 220 {
 221         int result;
 222
 223         /* SRAT: Static Resource Affinity Table */
 224         result = acpi_table_parse(ACPI_SRAT, acpi_parse_srat);
 225
 226         if (result > 0) {
 227                 result = acpi_table_parse_srat(ACPI_SRAT_PROCESSOR_AFFINITY,
 228                                                acpi_parse_processor_affinity,
 229                                                NR_CPUS);
 230                 result = acpi_table_parse_srat(ACPI_SRAT_MEMORY_AFFINITY, acpi_parse_memory_affinity, NR_NODE_MEMBLKS); // IA64 specific
 231         }
 232
 233         /* SLIT: System Locality Information Table */
 234         result = acpi_table_parse(ACPI_SLIT, acpi_parse_slit);
 235
 236         acpi_numa_arch_fixup();
 237         return 0;
 238 }
 239
 240 int acpi_get_pxm(acpi_handle h)
 241 {
 242         unsigned long pxm;
 243         acpi_status status;
 244         acpi_handle handle;
 245         acpi_handle phandle = h;
 246
 247         do {
 248                 handle = phandle;
 249                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 250                 if (ACPI_SUCCESS(status))
 251                         return pxm;
 252                 status = acpi_get_parent(handle, &phandle);
 253         } while (ACPI_SUCCESS(status));
 254         return -1;
 255 }
 256 EXPORT_SYMBOL(acpi_get_pxm);
 257
 258 int acpi_get_node(acpi_handle *handle)
 259 {
 260         int pxm, node = -1;
 261
 262         pxm = acpi_get_pxm(handle);
 263         if (pxm >= 0)
 264                 node = acpi_map_pxm_to_node(pxm);
 265
 266         return node;
 267 }
 268 EXPORT_SYMBOL(acpi_get_node);