LXR linux/arch/sh/mm/numa.c

   1/*
   2 * arch/sh/mm/numa.c - Multiple node support for SH machines
   3 *
   4 *  Copyright (C) 2007  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#include <linux/module.h>
  11#include <linux/bootmem.h>
  12#include <linux/memblock.h>
  13#include <linux/mm.h>
  14#include <linux/numa.h>
  15#include <linux/pfn.h>
  16#include <asm/sections.h>
  17
  18struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  19EXPORT_SYMBOL_GPL(node_data);
  20
  21/*
  22 * On SH machines the conventional approach is to stash system RAM
  23 * in node 0, and other memory blocks in to node 1 and up, ordered by
  24 * latency. Each node's pgdat is node-local at the beginning of the node,
  25 * immediately followed by the node mem map.
  26 */
  27void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  28{
  29        unsigned long bootmap_pages;
  30        unsigned long start_pfn, end_pfn;
  31        unsigned long bootmem_paddr;
  32
  33        /* Don't allow bogus node assignment */
  34        BUG_ON(nid > MAX_NUMNODES || nid <= 0);
  35
  36        start_pfn = start >> PAGE_SHIFT;
  37        end_pfn = end >> PAGE_SHIFT;
  38
  39        pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
  40                         PAGE_KERNEL);
  41
  42        memblock_add(start, end - start);
  43
  44        __add_active_range(nid, start_pfn, end_pfn);
  45
  46        /* Node-local pgdat */
  47        NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data),
  48                                             SMP_CACHE_BYTES, end));
  49        memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
  50
  51        NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  52        NODE_DATA(nid)->node_start_pfn = start_pfn;
  53        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  54
  55        /* Node-local bootmap */
  56        bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
  57        bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
  58                                       PAGE_SIZE, end);
  59        init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
  60                          start_pfn, end_pfn);
  61
  62        free_bootmem_with_active_regions(nid, end_pfn);
  63
  64        /* Reserve the pgdat and bootmap space with the bootmem allocator */
  65        reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
  66                             sizeof(struct pglist_data), BOOTMEM_DEFAULT);
  67        reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
  68                             bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
  69
  70        /* It's up */
  71        node_set_online(nid);
  72
  73        /* Kick sparsemem */
  74        sparse_memory_present_with_active_regions(nid);
  75}
  76