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