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 #ifdef CONFIG_DISCONTIGMEM
  14
  15 extern struct pglist_data *node_data[];
  16
  17 /*
  18  * Following are specific to this numa platform.
  19  */
  20
  21 extern int numa_cpu_lookup_table[];
  22 extern char *numa_memory_lookup_table;
  23 extern cpumask_t numa_cpumask_lookup_table[];
  24 extern int nr_cpus_in_node[];
  25
  26 /* 16MB regions */
  27 #define MEMORY_INCREMENT_SHIFT 24
  28 #define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
  29
  30 /* NUMA debugging, will not work on a DLPAR machine */
  31 #undef DEBUG_NUMA
  32
  33 static inline int pa_to_nid(unsigned long pa)
  34 {
  35         int nid;
  36
  37         nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
  38
  39 #ifdef DEBUG_NUMA
  40         /* the physical address passed in is not in the map for the system */
  41         if (nid == -1) {
  42                 printk("bad address: %lx\n", pa);
  43                 BUG();
  44         }
  45 #endif
  46
  47         return nid;
  48 }
  49
  50 #define pfn_to_nid(pfn)         pa_to_nid((pfn) << PAGE_SHIFT)
  51
  52 /*
  53  * Return a pointer to the node data for node n.
  54  */
  55 #define NODE_DATA(nid)          (node_data[nid])
  56
  57 #define node_localnr(pfn, nid)  ((pfn) - NODE_DATA(nid)->node_start_pfn)
  58
  59 /*
  60  * Following are macros that each numa implmentation must define.
  61  */
  62
  63 /*
  64  * Given a kernel address, find the home node of the underlying memory.
  65  */
  66 #define kvaddr_to_nid(kaddr)    pa_to_nid(__pa(kaddr))
  67
  68 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  69 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  70 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_end_pfn)
  71
  72 #define local_mapnr(kvaddr) \
  73         ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
  74
  75 /* Written this way to avoid evaluating arguments twice */
  76 #define discontigmem_pfn_to_page(pfn) \
  77 ({ \
  78         unsigned long __tmp = pfn; \
  79         (node_mem_map(pfn_to_nid(__tmp)) + \
  80          node_localnr(__tmp, pfn_to_nid(__tmp))); \
  81 })
  82
  83 #define discontigmem_page_to_pfn(p) \
  84 ({ \
  85         struct page *__tmp = p; \
  86         (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
  87          page_zone(__tmp)->zone_start_pfn); \
  88 })
  89
  90 /* XXX fix for discontiguous physical memory */
  91 #define discontigmem_pfn_valid(pfn)             ((pfn) < num_physpages)
  92
  93 #endif /* CONFIG_DISCONTIGMEM */
  94 #endif /* _ASM_MMZONE_H_ */