include/asm-ppc64/mmzone.h

   1 /*
   2  * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
   3  *
   4  * PowerPC64 port:
   5  * Copyright (C) 2002 Anton Blanchard, IBM Corp.
   6  */
   7 #ifndef _ASM_MMZONE_H_
   8 #define _ASM_MMZONE_H_
   9
  10 #include <linux/config.h>
  11 #include <asm/smp.h>
  12
  13 /* generic non-linear memory support:
  14  *
  15  * 1) we will not split memory into more chunks than will fit into the
  16  *    flags field of the struct page
  17  */
  18
  19
  20 #ifdef CONFIG_NEED_MULTIPLE_NODES
  21
  22 extern struct pglist_data *node_data[];
  23 /*
  24  * Return a pointer to the node data for node n.
  25  */
  26 #define NODE_DATA(nid)          (node_data[nid])
  27
  28 /*
  29  * Following are specific to this numa platform.
  30  */
  31
  32 extern int numa_cpu_lookup_table[];
  33 extern char *numa_memory_lookup_table;
  34 extern cpumask_t numa_cpumask_lookup_table[];
  35 #ifdef CONFIG_MEMORY_HOTPLUG
  36 extern unsigned long max_pfn;
  37 #endif
  38
  39 /* 16MB regions */
  40 #define MEMORY_INCREMENT_SHIFT 24
  41 #define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
  42
  43 /* NUMA debugging, will not work on a DLPAR machine */
  44 #undef DEBUG_NUMA
  45
  46 static inline int pa_to_nid(unsigned long pa)
  47 {
  48         int nid;
  49
  50 #ifdef CONFIG_MEMORY_HOTPLUG
  51         /* kludge hot added sections default to node 0 */
  52         if (pa >= (max_pfn << PAGE_SHIFT))
  53                 return 0;
  54 #endif
  55         nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
  56
  57 #ifdef DEBUG_NUMA
  58         /* the physical address passed in is not in the map for the system */
  59         if (nid == -1) {
  60                 printk("bad address: %lx\n", pa);
  61                 BUG();
  62         }
  63 #endif
  64
  65         return nid;
  66 }
  67
  68 /*
  69  * Following are macros that each numa implmentation must define.
  70  */
  71
  72 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  73 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_end_pfn)
  74
  75 #ifdef CONFIG_DISCONTIGMEM
  76
  77 #define node_localnr(pfn, nid)  ((pfn) - NODE_DATA(nid)->node_start_pfn)
  78
  79 #define pfn_to_nid(pfn)         pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  80
  81 /* Written this way to avoid evaluating arguments twice */
  82 #define discontigmem_pfn_to_page(pfn) \
  83 ({ \
  84         unsigned long __tmp = pfn; \
  85         (NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
  86          node_localnr(__tmp, pfn_to_nid(__tmp))); \
  87 })
  88
  89 #define discontigmem_page_to_pfn(p) \
  90 ({ \
  91         struct page *__tmp = p; \
  92         (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
  93          page_zone(__tmp)->zone_start_pfn); \
  94 })
  95
  96 /* XXX fix for discontiguous physical memory */
  97 #define discontigmem_pfn_valid(pfn)             ((pfn) < num_physpages)
  98
  99 #endif /* CONFIG_DISCONTIGMEM */
 100
 101 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 102
 103 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
 104 #define early_pfn_to_nid(pfn)  pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
 105 #endif
 106
 107 #endif /* _ASM_MMZONE_H_ */