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
  19 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  20 EXPORT_SYMBOL_GPL(node_data);
  21
  22 extern 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  */
  30 void __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
  79 void __init __weak soc_mem_setup(void)
  80 {
  81 }