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/memblock.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_bootmem_node(int nid, unsigned long start, unsigned long end)
  27 {
  28         unsigned long start_pfn, end_pfn;
  29
  30         /* Don't allow bogus node assignment */
  31         BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
  32
  33         start_pfn = PFN_DOWN(start);
  34         end_pfn = PFN_DOWN(end);
  35
  36         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
  37                          PAGE_KERNEL);
  38
  39         memblock_add(start, end - start);
  40
  41         __add_active_range(nid, start_pfn, end_pfn);
  42
  43         /* Node-local pgdat */
  44         NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
  45                                              SMP_CACHE_BYTES, nid);
  46         if (!NODE_DATA(nid))
  47                 panic("%s: Failed to allocate %zu bytes align=0x%x nid=%d\n",
  48                       __func__, sizeof(struct pglist_data), SMP_CACHE_BYTES,
  49                       nid);
  50
  51         NODE_DATA(nid)->node_start_pfn = start_pfn;
  52         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  53
  54         /* It's up */
  55         node_set_online(nid);
  56
  57         /* Kick sparsemem */
  58         sparse_memory_present_with_active_regions(nid);
  59 }