mm/numa.c

   1 /*
   2  * Written by Kanoj Sarcar, SGI, Aug 1999
   3  */
   4 #include <linux/config.h>
   5 #include <linux/kernel.h>
   6 #include <linux/mm.h>
   7 #include <linux/init.h>
   8 #include <linux/bootmem.h>
   9 #include <linux/mmzone.h>
  10 #include <linux/spinlock.h>
  11
  12 int numnodes = 1;       /* Initialized for UMA platforms */
  13
  14 static bootmem_data_t contig_bootmem_data;
  15 pg_data_t contig_page_data = { bdata: &contig_bootmem_data };
  16
  17 #ifndef CONFIG_DISCONTIGMEM
  18
  19 /*
  20  * This is meant to be invoked by platforms whose physical memory starts
  21  * at a considerably higher value than 0. Examples are Super-H, ARM, m68k.
  22  * Should be invoked with paramters (0, 0, unsigned long *[], start_paddr).
  23  */
  24 void __init free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
  25         unsigned long *zones_size, unsigned long zone_start_paddr,
  26         unsigned long *zholes_size)
  27 {
  28         free_area_init_core(0, &contig_page_data, &mem_map, zones_size,
  29                                 zone_start_paddr, zholes_size, pmap);
  30 }
  31
  32 #endif /* !CONFIG_DISCONTIGMEM */
  33
  34 struct page * alloc_pages_node(int nid, int gfp_mask, unsigned long order)
  35 {
  36 #ifdef CONFIG_NUMA
  37         return __alloc_pages(NODE_DATA(nid)->node_zonelists + gfp_mask, order);
  38 #else
  39         return alloc_pages(gfp_mask, order);
  40 #endif
  41 }
  42
  43 #ifdef CONFIG_DISCONTIGMEM
  44
  45 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
  46
  47 static spinlock_t node_lock = SPIN_LOCK_UNLOCKED;
  48
  49 void show_free_areas_node(pg_data_t *pgdat)
  50 {
  51         unsigned long flags;
  52
  53         spin_lock_irqsave(&node_lock, flags);
  54         show_free_areas_core(pgdat);
  55         spin_unlock_irqrestore(&node_lock, flags);
  56 }
  57
  58 /*
  59  * Nodes can be initialized parallely, in no particular order.
  60  */
  61 void __init free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
  62         unsigned long *zones_size, unsigned long zone_start_paddr,
  63         unsigned long *zholes_size)
  64 {
  65         int i, size = 0;
  66         struct page *discard;
  67
  68         if (mem_map == (mem_map_t *)NULL)
  69                 mem_map = (mem_map_t *)PAGE_OFFSET;
  70
  71         free_area_init_core(nid, pgdat, &discard, zones_size, zone_start_paddr,
  72                                         zholes_size, pmap);
  73         pgdat->node_id = nid;
  74
  75         /*
  76          * Get space for the valid bitmap.
  77          */
  78         for (i = 0; i < MAX_NR_ZONES; i++)
  79                 size += zones_size[i];
  80         size = LONG_ALIGN((size + 7) >> 3);
  81         pgdat->valid_addr_bitmap = (unsigned long *)alloc_bootmem_node(pgdat, size);
  82         memset(pgdat->valid_addr_bitmap, 0, size);
  83 }
  84
  85 static struct page * alloc_pages_pgdat(pg_data_t *pgdat, int gfp_mask,
  86         unsigned long order)
  87 {
  88         return __alloc_pages(pgdat->node_zonelists + gfp_mask, order);
  89 }
  90
  91 /*
  92  * This can be refined. Currently, tries to do round robin, instead
  93  * should do concentratic circle search, starting from current node.
  94  */
  95 struct page * alloc_pages(int gfp_mask, unsigned long order)
  96 {
  97         struct page *ret = 0;
  98         pg_data_t *start, *temp;
  99 #ifndef CONFIG_NUMA
 100         unsigned long flags;
 101         static pg_data_t *next = 0;
 102 #endif
 103
 104         if (order >= MAX_ORDER)
 105                 return NULL;
 106 #ifdef CONFIG_NUMA
 107         temp = NODE_DATA(numa_node_id());
 108 #else
 109         spin_lock_irqsave(&node_lock, flags);
 110         if (!next) next = pgdat_list;
 111         temp = next;
 112         next = next->node_next;
 113         spin_unlock_irqrestore(&node_lock, flags);
 114 #endif
 115         start = temp;
 116         while (temp) {
 117                 if ((ret = alloc_pages_pgdat(temp, gfp_mask, order)))
 118                         return(ret);
 119                 temp = temp->node_next;
 120         }
 121         temp = pgdat_list;
 122         while (temp != start) {
 123                 if ((ret = alloc_pages_pgdat(temp, gfp_mask, order)))
 124                         return(ret);
 125                 temp = temp->node_next;
 126         }
 127         return(0);
 128 }
 129
 130 #endif /* CONFIG_DISCONTIGMEM */