arch/x86/mm/pat_internal.h

   1 #ifndef __PAT_INTERNAL_H_
   2 #define __PAT_INTERNAL_H_
   3
   4 extern int pat_debug_enable;
   5
   6 #define dprintk(fmt, arg...) \
   7         do { if (pat_debug_enable) pr_info("x86/PAT: " fmt, ##arg); } while (0)
   8
   9 struct memtype {
  10         u64                     start;
  11         u64                     end;
  12         u64                     subtree_max_end;
  13         enum page_cache_mode    type;
  14         struct rb_node          rb;
  15 };
  16
  17 static inline char *cattr_name(enum page_cache_mode pcm)
  18 {
  19         switch (pcm) {
  20         case _PAGE_CACHE_MODE_UC:               return "uncached";
  21         case _PAGE_CACHE_MODE_UC_MINUS:         return "uncached-minus";
  22         case _PAGE_CACHE_MODE_WB:               return "write-back";
  23         case _PAGE_CACHE_MODE_WC:               return "write-combining";
  24         case _PAGE_CACHE_MODE_WT:               return "write-through";
  25         case _PAGE_CACHE_MODE_WP:               return "write-protected";
  26         default:                                return "broken";
  27         }
  28 }
  29
  30 #ifdef CONFIG_X86_PAT
  31 extern int rbt_memtype_check_insert(struct memtype *new,
  32                                         enum page_cache_mode *new_type);
  33 extern struct memtype *rbt_memtype_erase(u64 start, u64 end);
  34 extern struct memtype *rbt_memtype_lookup(u64 addr);
  35 extern int rbt_memtype_copy_nth_element(struct memtype *out, loff_t pos);
  36 #else
  37 static inline int rbt_memtype_check_insert(struct memtype *new,
  38                                         enum page_cache_mode *new_type)
  39 { return 0; }
  40 static inline struct memtype *rbt_memtype_erase(u64 start, u64 end)
  41 { return NULL; }
  42 static inline struct memtype *rbt_memtype_lookup(u64 addr)
  43 { return NULL; }
  44 static inline int rbt_memtype_copy_nth_element(struct memtype *out, loff_t pos)
  45 { return 0; }
  46 #endif
  47
  48 #endif /* __PAT_INTERNAL_H_ */