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

   1/*
   2 *  Multiple memory node support for Meta machines
   3 *
   4 *  Copyright (C) 2007  Paul Mundt
   5 *  Copyright (C) 2010  Imagination Technologies Ltd.
   6 *
   7 * This file is subject to the terms and conditions of the GNU General Public
   8 * License.  See the file "COPYING" in the main directory of this archive
   9 * for more details.
  10 */
  11#include <linux/export.h>
  12#include <linux/bootmem.h>
  13#include <linux/memblock.h>
  14#include <linux/mm.h>
  15#include <linux/numa.h>
  16#include <linux/pfn.h>
  17#include <asm/sections.h>
  18
  19struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  20EXPORT_SYMBOL_GPL(node_data);
  21
  22extern char _heap_start[];
  23
  24/*
  25 * On Meta machines the conventional approach is to stash system RAM
  26 * in node 0, and other memory blocks in to node 1 and up, ordered by
  27 * latency. Each node's pgdat is node-local at the beginning of the node,
  28 * immediately followed by the node mem map.
  29 */
  30void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  31{
  32        unsigned long bootmap_pages, bootmem_paddr;
  33        unsigned long start_pfn, end_pfn;
  34        unsigned long pgdat_paddr;
  35
  36        /* Don't allow bogus node assignment */
  37        BUG_ON(nid > MAX_NUMNODES || nid <= 0);
  38
  39        start_pfn = start >> PAGE_SHIFT;
  40        end_pfn = end >> PAGE_SHIFT;
  41
  42        memblock_add(start, end - start);
  43
  44        memblock_set_node(PFN_PHYS(start_pfn),
  45                          PFN_PHYS(end_pfn - start_pfn), nid);
  46
  47        /* Node-local pgdat */
  48        pgdat_paddr = memblock_alloc_base(sizeof(struct pglist_data),
  49                                          SMP_CACHE_BYTES, end);
  50        NODE_DATA(nid) = __va(pgdat_paddr);
  51        memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
  52
  53        NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  54        NODE_DATA(nid)->node_start_pfn = start_pfn;
  55        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  56
  57        /* Node-local bootmap */
  58        bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
  59        bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
  60                                            PAGE_SIZE, end);
  61        init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
  62                          start_pfn, end_pfn);
  63
  64        free_bootmem_with_active_regions(nid, end_pfn);
  65
  66        /* Reserve the pgdat and bootmap space with the bootmem allocator */
  67        reserve_bootmem_node(NODE_DATA(nid), pgdat_paddr & PAGE_MASK,
  68                             sizeof(struct pglist_data), BOOTMEM_DEFAULT);
  69        reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
  70                             bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
  71
  72        /* It's up */
  73        node_set_online(nid);
  74
  75        /* Kick sparsemem */
  76        sparse_memory_present_with_active_regions(nid);
  77}
  78
  79void __init __weak soc_mem_setup(void)
  80{
  81}
  82