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/config.h>
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/acpi.h>
  32 #include <acpi/acpi_bus.h>
  33 #include <acpi/acmacros.h>
  34
  35 #define ACPI_NUMA       0x80000000
  36 #define _COMPONENT      ACPI_NUMA
  37 ACPI_MODULE_NAME("numa")
  38
  39 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  40 #define PXM_INVAL       -1
  41 #define NID_INVAL       -1
  42
  43 /* maps to convert between proximity domain and logical node ID */
  44 int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
  45                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
  46 int __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
  47                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  48
  49 extern int __init acpi_table_parse_madt_family(enum acpi_table_id id,
  50                                                unsigned long madt_size,
  51                                                int entry_id,
  52                                                acpi_madt_entry_handler handler,
  53                                                unsigned int max_entries);
  54
  55 int __cpuinit pxm_to_node(int pxm)
  56 {
  57         if (pxm < 0)
  58                 return NID_INVAL;
  59         return pxm_to_node_map[pxm];
  60 }
  61
  62 int __cpuinit node_to_pxm(int node)
  63 {
  64         if (node < 0)
  65                 return PXM_INVAL;
  66         return node_to_pxm_map[node];
  67 }
  68
  69 int __cpuinit acpi_map_pxm_to_node(int pxm)
  70 {
  71         int node = pxm_to_node_map[pxm];
  72
  73         if (node < 0){
  74                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  75                         return NID_INVAL;
  76                 node = first_unset_node(nodes_found_map);
  77                 pxm_to_node_map[pxm] = node;
  78                 node_to_pxm_map[node] = pxm;
  79                 node_set(node, nodes_found_map);
  80         }
  81
  82         return node;
  83 }
  84
  85 void __cpuinit acpi_unmap_pxm_to_node(int node)
  86 {
  87         int pxm = node_to_pxm_map[node];
  88         pxm_to_node_map[pxm] = NID_INVAL;
  89         node_to_pxm_map[node] = PXM_INVAL;
  90         node_clear(node, nodes_found_map);
  91 }
  92
  93 void __init acpi_table_print_srat_entry(acpi_table_entry_header * header)
  94 {
  95
  96         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  97
  98         if (!header)
  99                 return;
 100
 101         switch (header->type) {
 102
 103         case ACPI_SRAT_PROCESSOR_AFFINITY:
 104 #ifdef ACPI_DEBUG_OUTPUT
 105                 {
 106                         struct acpi_table_processor_affinity *p =
 107                             (struct acpi_table_processor_affinity *)header;
 108                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 109                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 110                                           p->apic_id, p->lsapic_eid,
 111                                           p->proximity_domain,
 112                                           p->flags.
 113                                           enabled ? "enabled" : "disabled"));
 114                 }
 115 #endif                          /* ACPI_DEBUG_OUTPUT */
 116                 break;
 117
 118         case ACPI_SRAT_MEMORY_AFFINITY:
 119 #ifdef ACPI_DEBUG_OUTPUT
 120                 {
 121                         struct acpi_table_memory_affinity *p =
 122                             (struct acpi_table_memory_affinity *)header;
 123                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 124                                           "SRAT Memory (0x%08x%08x length 0x%08x%08x type 0x%x) in proximity domain %d %s%s\n",
 125                                           p->base_addr_hi, p->base_addr_lo,
 126                                           p->length_hi, p->length_lo,
 127                                           p->memory_type, p->proximity_domain,
 128                                           p->flags.
 129                                           enabled ? "enabled" : "disabled",
 130                                           p->flags.
 131                                           hot_pluggable ? " hot-pluggable" :
 132                                           ""));
 133                 }
 134 #endif                          /* ACPI_DEBUG_OUTPUT */
 135                 break;
 136
 137         default:
 138                 printk(KERN_WARNING PREFIX
 139                        "Found unsupported SRAT entry (type = 0x%x)\n",
 140                        header->type);
 141                 break;
 142         }
 143 }
 144
 145 static int __init acpi_parse_slit(unsigned long phys_addr, unsigned long size)
 146 {
 147         struct acpi_table_slit *slit;
 148         u32 localities;
 149
 150         if (!phys_addr || !size)
 151                 return -EINVAL;
 152
 153         slit = (struct acpi_table_slit *)__va(phys_addr);
 154
 155         /* downcast just for %llu vs %lu for i386/ia64  */
 156         localities = (u32) slit->localities;
 157
 158         acpi_numa_slit_init(slit);
 159
 160         return 0;
 161 }
 162
 163 static int __init
 164 acpi_parse_processor_affinity(acpi_table_entry_header * header,
 165                               const unsigned long end)
 166 {
 167         struct acpi_table_processor_affinity *processor_affinity;
 168
 169         processor_affinity = (struct acpi_table_processor_affinity *)header;
 170         if (!processor_affinity)
 171                 return -EINVAL;
 172
 173         acpi_table_print_srat_entry(header);
 174
 175         /* let architecture-dependent part to do it */
 176         acpi_numa_processor_affinity_init(processor_affinity);
 177
 178         return 0;
 179 }
 180
 181 static int __init
 182 acpi_parse_memory_affinity(acpi_table_entry_header * header,
 183                            const unsigned long end)
 184 {
 185         struct acpi_table_memory_affinity *memory_affinity;
 186
 187         memory_affinity = (struct acpi_table_memory_affinity *)header;
 188         if (!memory_affinity)
 189                 return -EINVAL;
 190
 191         acpi_table_print_srat_entry(header);
 192
 193         /* let architecture-dependent part to do it */
 194         acpi_numa_memory_affinity_init(memory_affinity);
 195
 196         return 0;
 197 }
 198
 199 static int __init acpi_parse_srat(unsigned long phys_addr, unsigned long size)
 200 {
 201         struct acpi_table_srat *srat;
 202
 203         if (!phys_addr || !size)
 204                 return -EINVAL;
 205
 206         srat = (struct acpi_table_srat *)__va(phys_addr);
 207
 208         return 0;
 209 }
 210
 211 int __init
 212 acpi_table_parse_srat(enum acpi_srat_entry_id id,
 213                       acpi_madt_entry_handler handler, unsigned int max_entries)
 214 {
 215         return acpi_table_parse_madt_family(ACPI_SRAT,
 216                                             sizeof(struct acpi_table_srat), id,
 217                                             handler, max_entries);
 218 }
 219
 220 int __init acpi_numa_init(void)
 221 {
 222         int result;
 223
 224         /* SRAT: Static Resource Affinity Table */
 225         result = acpi_table_parse(ACPI_SRAT, acpi_parse_srat);
 226
 227         if (result > 0) {
 228                 result = acpi_table_parse_srat(ACPI_SRAT_PROCESSOR_AFFINITY,
 229                                                acpi_parse_processor_affinity,
 230                                                NR_CPUS);
 231                 result = acpi_table_parse_srat(ACPI_SRAT_MEMORY_AFFINITY, acpi_parse_memory_affinity, NR_NODE_MEMBLKS); // IA64 specific
 232         }
 233
 234         /* SLIT: System Locality Information Table */
 235         result = acpi_table_parse(ACPI_SLIT, acpi_parse_slit);
 236
 237         acpi_numa_arch_fixup();
 238         return 0;
 239 }
 240
 241 int acpi_get_pxm(acpi_handle h)
 242 {
 243         unsigned long pxm;
 244         acpi_status status;
 245         acpi_handle handle;
 246         acpi_handle phandle = h;
 247
 248         do {
 249                 handle = phandle;
 250                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 251                 if (ACPI_SUCCESS(status))
 252                         return (int)pxm;
 253                 status = acpi_get_parent(handle, &phandle);
 254         } while (ACPI_SUCCESS(status));
 255         return -1;
 256 }
 257 EXPORT_SYMBOL(acpi_get_pxm);
 258
 259 int acpi_get_node(acpi_handle *handle)
 260 {
 261         int pxm, node = -1;
 262
 263         ACPI_FUNCTION_TRACE("acpi_get_node");
 264
 265         pxm = acpi_get_pxm(handle);
 266         if (pxm >= 0)
 267                 node = acpi_map_pxm_to_node(pxm);
 268
 269         return_VALUE(node);
 270 }
 271 EXPORT_SYMBOL(acpi_get_node);