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
  17 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  18 EXPORT_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  */
  26 void __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
  46 void __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 }