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