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
  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_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 = PFN_DOWN(start);
  37         end_pfn = PFN_DOWN(end);
  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 }