numa.c

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/*
 * arch/sh/mm/numa.c - Multiple node support for SH machines
 *
 *  Copyright (C) 2007  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/numa.h>
#include <linux/pfn.h>
#include <asm/sections.h>

struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL_GPL(node_data);

/*
 * On SH machines the conventional approach is to stash system RAM
 * in node 0, and other memory blocks in to node 1 and up, ordered by
 * latency. Each node's pgdat is node-local at the beginning of the node,
 * immediately followed by the node mem map.
 */
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
    unsigned long bootmap_pages;
    unsigned long start_pfn, end_pfn;
    unsigned long bootmem_paddr;

    /* Don't allow bogus node assignment */
    BUG_ON(nid > MAX_NUMNODES || nid <= 0);

    start_pfn = start >> PAGE_SHIFT;
    end_pfn = end >> PAGE_SHIFT;

    pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
             PAGE_KERNEL);

    memblock_add(start, end - start);

    __add_active_range(nid, start_pfn, end_pfn);

    /* Node-local pgdat */
    NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data),
                         SMP_CACHE_BYTES, end));
    memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));

    NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
    NODE_DATA(nid)->node_start_pfn = start_pfn;
    NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;

    /* Node-local bootmap */
    bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
    bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
                       PAGE_SIZE, end);
    init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
              start_pfn, end_pfn);

    free_bootmem_with_active_regions(nid, end_pfn);

    /* Reserve the pgdat and bootmap space with the bootmem allocator */
    reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
                 sizeof(struct pglist_data), BOOTMEM_DEFAULT);
    reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
                 bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);

    /* It's up */
    node_set_online(nid);

    /* Kick sparsemem */
    sparse_memory_present_with_active_regions(nid);
}