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numa.c

/*
 *  acpi_numa.c - ACPI NUMA support
 *
 *  Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acmacros.h>

#define ACPI_NUMA 0x80000000
#define _COMPONENT      ACPI_NUMA
ACPI_MODULE_NAME("numa");

static nodemask_t nodes_found_map = NODE_MASK_NONE;

/* maps to convert between proximity domain and logical node ID */
static int pxm_to_node_map[MAX_PXM_DOMAINS]
                        = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
static int node_to_pxm_map[MAX_NUMNODES]
                        = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };

int pxm_to_node(int pxm)
{
      if (pxm < 0)
            return NID_INVAL;
      return pxm_to_node_map[pxm];
}

int node_to_pxm(int node)
{
      if (node < 0)
            return PXM_INVAL;
      return node_to_pxm_map[node];
}

void __acpi_map_pxm_to_node(int pxm, int node)
{
      pxm_to_node_map[pxm] = node;
      node_to_pxm_map[node] = pxm;
}

int acpi_map_pxm_to_node(int pxm)
{
      int node = pxm_to_node_map[pxm];

      if (node < 0){
            if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
                  return NID_INVAL;
            node = first_unset_node(nodes_found_map);
            __acpi_map_pxm_to_node(pxm, node);
            node_set(node, nodes_found_map);
      }

      return node;
}

void __cpuinit acpi_unmap_pxm_to_node(int node)
{
      int pxm = node_to_pxm_map[node];
      pxm_to_node_map[pxm] = NID_INVAL;
      node_to_pxm_map[node] = PXM_INVAL;
      node_clear(node, nodes_found_map);
}

static void __init
acpi_table_print_srat_entry(struct acpi_subtable_header *header)
{

      ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");

      if (!header)
            return;

      switch (header->type) {

      case ACPI_SRAT_TYPE_CPU_AFFINITY:
#ifdef ACPI_DEBUG_OUTPUT
            {
                  struct acpi_srat_cpu_affinity *p =
                      (struct acpi_srat_cpu_affinity *)header;
                  ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
                                p->apic_id, p->local_sapic_eid,
                                p->proximity_domain_lo,
                                (p->flags & ACPI_SRAT_CPU_ENABLED)?
                                "enabled" : "disabled"));
            }
#endif                        /* ACPI_DEBUG_OUTPUT */
            break;

      case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
#ifdef ACPI_DEBUG_OUTPUT
            {
                  struct acpi_srat_mem_affinity *p =
                      (struct acpi_srat_mem_affinity *)header;
                  ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
                                (unsigned long)p->base_address,
                                (unsigned long)p->length,
                                p->memory_type, p->proximity_domain,
                                (p->flags & ACPI_SRAT_MEM_ENABLED)?
                                "enabled" : "disabled",
                                (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
                                " hot-pluggable" : ""));
            }
#endif                        /* ACPI_DEBUG_OUTPUT */
            break;

      default:
            printk(KERN_WARNING PREFIX
                   "Found unsupported SRAT entry (type = 0x%x)\n",
                   header->type);
            break;
      }
}

static int __init acpi_parse_slit(struct acpi_table_header *table)
{
      struct acpi_table_slit *slit;
      u32 localities;

      if (!table)
            return -EINVAL;

      slit = (struct acpi_table_slit *)table;

      /* downcast just for %llu vs %lu for i386/ia64  */
      localities = (u32) slit->locality_count;

      acpi_numa_slit_init(slit);

      return 0;
}

static int __init
acpi_parse_processor_affinity(struct acpi_subtable_header * header,
                        const unsigned long end)
{
      struct acpi_srat_cpu_affinity *processor_affinity;

      processor_affinity = (struct acpi_srat_cpu_affinity *)header;
      if (!processor_affinity)
            return -EINVAL;

      acpi_table_print_srat_entry(header);

      /* let architecture-dependent part to do it */
      acpi_numa_processor_affinity_init(processor_affinity);

      return 0;
}

static int __init
acpi_parse_memory_affinity(struct acpi_subtable_header * header,
                     const unsigned long end)
{
      struct acpi_srat_mem_affinity *memory_affinity;

      memory_affinity = (struct acpi_srat_mem_affinity *)header;
      if (!memory_affinity)
            return -EINVAL;

      acpi_table_print_srat_entry(header);

      /* let architecture-dependent part to do it */
      acpi_numa_memory_affinity_init(memory_affinity);

      return 0;
}

static int __init acpi_parse_srat(struct acpi_table_header *table)
{
      struct acpi_table_srat *srat;

      if (!table)
            return -EINVAL;

      srat = (struct acpi_table_srat *)table;

      return 0;
}

static int __init
acpi_table_parse_srat(enum acpi_srat_type id,
                  acpi_table_entry_handler handler, unsigned int max_entries)
{
      return acpi_table_parse_entries(ACPI_SIG_SRAT,
                                  sizeof(struct acpi_table_srat), id,
                                  handler, max_entries);
}

int __init acpi_numa_init(void)
{
      /* SRAT: Static Resource Affinity Table */
      if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
            acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
                              acpi_parse_processor_affinity, NR_CPUS);
            acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
                              acpi_parse_memory_affinity,
                              NR_NODE_MEMBLKS);
      }

      /* SLIT: System Locality Information Table */
      acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);

      acpi_numa_arch_fixup();
      return 0;
}

int acpi_get_pxm(acpi_handle h)
{
      unsigned long pxm;
      acpi_status status;
      acpi_handle handle;
      acpi_handle phandle = h;

      do {
            handle = phandle;
            status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
            if (ACPI_SUCCESS(status))
                  return pxm;
            status = acpi_get_parent(handle, &phandle);
      } while (ACPI_SUCCESS(status));
      return -1;
}
EXPORT_SYMBOL(acpi_get_pxm);

int acpi_get_node(acpi_handle *handle)
{
      int pxm, node = -1;

      pxm = acpi_get_pxm(handle);
      if (pxm >= 0)
            node = acpi_map_pxm_to_node(pxm);

      return node;
}
EXPORT_SYMBOL(acpi_get_node);

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