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 extern int nr_cpus_in_node[];
  36 #ifdef CONFIG_MEMORY_HOTPLUG
  37 extern unsigned long max_pfn;
  38 #endif
  39
  40 /* 16MB regions */
  41 #define MEMORY_INCREMENT_SHIFT 24
  42 #define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
  43
  44 /* NUMA debugging, will not work on a DLPAR machine */
  45 #undef DEBUG_NUMA
  46
  47 static inline int pa_to_nid(unsigned long pa)
  48 {
  49         int nid;
  50
  51 #ifdef CONFIG_MEMORY_HOTPLUG
  52         /* kludge hot added sections default to node 0 */
  53         if (pa >= (max_pfn << PAGE_SHIFT))
  54                 return 0;
  55 #endif
  56         nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
  57
  58 #ifdef DEBUG_NUMA
  59         /* the physical address passed in is not in the map for the system */
  60         if (nid == -1) {
  61                 printk("bad address: %lx\n", pa);
  62                 BUG();
  63         }
  64 #endif
  65
  66         return nid;
  67 }
  68
  69 #define node_localnr(pfn, nid)  ((pfn) - NODE_DATA(nid)->node_start_pfn)
  70
  71 /*
  72  * Following are macros that each numa implmentation must define.
  73  */
  74
  75 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  76 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_end_pfn)
  77
  78 #ifdef CONFIG_DISCONTIGMEM
  79
  80 /*
  81  * Given a kernel address, find the home node of the underlying memory.
  82  */
  83 #define kvaddr_to_nid(kaddr)    pa_to_nid(__pa(kaddr))
  84
  85 #define pfn_to_nid(pfn)         pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  86
  87 /* Written this way to avoid evaluating arguments twice */
  88 #define discontigmem_pfn_to_page(pfn) \
  89 ({ \
  90         unsigned long __tmp = pfn; \
  91         (NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
  92          node_localnr(__tmp, pfn_to_nid(__tmp))); \
  93 })
  94
  95 #define discontigmem_page_to_pfn(p) \
  96 ({ \
  97         struct page *__tmp = p; \
  98         (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
  99          page_zone(__tmp)->zone_start_pfn); \
 100 })
 101
 102 /* XXX fix for discontiguous physical memory */
 103 #define discontigmem_pfn_valid(pfn)             ((pfn) < num_physpages)
 104
 105 #endif /* CONFIG_DISCONTIGMEM */
 106
 107 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 108
 109 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
 110 #define early_pfn_to_nid(pfn)  pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
 111 #endif
 112
 113 #endif /* _ASM_MMZONE_H_ */