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/mm.h>
  13#include <linux/numa.h>
  14#include <linux/pfn.h>
  15#include <asm/sections.h>
  16
  17struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  18EXPORT_SYMBOL_GPL(node_data);
  19
  20/*
  21 * On SH machines the conventional approach is to stash system RAM
  22 * in node 0, and other memory blocks in to node 1 and up, ordered by
  23 * latency. Each node's pgdat is node-local at the beginning of the node,
  24 * immediately followed by the node mem map.
  25 */
  26void __init setup_memory(void)
  27{
  28        unsigned long free_pfn = PFN_UP(__pa(_end));
  29
  30        /*
  31         * Node 0 sets up its pgdat at the first available pfn,
  32         * and bumps it up before setting up the bootmem allocator.
  33         */
  34        NODE_DATA(0) = pfn_to_kaddr(free_pfn);
  35        memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
  36        free_pfn += PFN_UP(sizeof(struct pglist_data));
  37        NODE_DATA(0)->bdata = &bootmem_node_data[0];
  38
  39        /* Set up node 0 */
  40        setup_bootmem_allocator(free_pfn);
  41
  42        /* Give the platforms a chance to hook up their nodes */
  43        plat_mem_setup();
  44}
  45
  46void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  47{
  48        unsigned long bootmap_pages, bootmap_start, bootmap_size;
  49        unsigned long start_pfn, free_pfn, end_pfn;
  50
  51        /* Don't allow bogus node assignment */
  52        BUG_ON(nid > MAX_NUMNODES || nid == 0);
  53
  54        /*
  55         * The free pfn starts at the beginning of the range, and is
  56         * advanced as necessary for pgdat and node map allocations.
  57         */
  58        free_pfn = start_pfn = start >> PAGE_SHIFT;
  59        end_pfn = end >> PAGE_SHIFT;
  60
  61        __add_active_range(nid, start_pfn, end_pfn);
  62
  63        /* Node-local pgdat */
  64        NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
  65        free_pfn += PFN_UP(sizeof(struct pglist_data));
  66        memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
  67
  68        NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  69        NODE_DATA(nid)->node_start_pfn = start_pfn;
  70        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  71
  72        /* Node-local bootmap */
  73        bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
  74        bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
  75        bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
  76                                    end_pfn);
  77
  78        free_bootmem_with_active_regions(nid, end_pfn);
  79
  80        /* Reserve the pgdat and bootmap space with the bootmem allocator */
  81        reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
  82                             sizeof(struct pglist_data), BOOTMEM_DEFAULT);
  83        reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
  84                             bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
  85
  86        /* It's up */
  87        node_set_online(nid);
  88
  89        /* Kick sparsemem */
  90        sparse_memory_present_with_active_regions(nid);
  91}
  92