linux-imx

/*

 *  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.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 */

​

#define pr_fmt(fmt) "ACPI: " fmt

​

#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 <linux/memblock.h>

#include <linux/numa.h>

#include <linux/nodemask.h>

#include <linux/topology.h>

​

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] = NUMA_NO_NODE };

static int node_to_pxm_map[MAX_NUMNODES]

            = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };

​

unsigned char acpi_srat_revision __initdata;

int acpi_numa __initdata;

​

int pxm_to_node(int pxm)

{

    if (pxm < 0)

        return NUMA_NO_NODE;

    return pxm_to_node_map[pxm];

}

​

int node_to_pxm(int node)

{

    if (node < 0)

        return PXM_INVAL;

    return node_to_pxm_map[node];

}

​

static void __acpi_map_pxm_to_node(int pxm, int node)

{

    if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])

        pxm_to_node_map[pxm] = node;

    if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])

        node_to_pxm_map[node] = pxm;

}

​

int acpi_map_pxm_to_node(int pxm)

{

    int node;

​

    if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)

        return NUMA_NO_NODE;

​

    node = pxm_to_node_map[pxm];

​

    if (node == NUMA_NO_NODE) {

        if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)

            return NUMA_NO_NODE;

        node = first_unset_node(nodes_found_map);

        __acpi_map_pxm_to_node(pxm, node);

        node_set(node, nodes_found_map);

    }

​

    return node;

}

EXPORT_SYMBOL(acpi_map_pxm_to_node);

​

/**

 * acpi_map_pxm_to_online_node - Map proximity ID to online node

 * @pxm: ACPI proximity ID

 *