Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef __MEMTYPE_H_
       3             : #define __MEMTYPE_H_
       4             : 
       5             : extern int pat_debug_enable;
       6             : 
       7             : #define dprintk(fmt, arg...) \
       8             :         do { if (pat_debug_enable) pr_info("x86/PAT: " fmt, ##arg); } while (0)
       9             : 
      10             : struct memtype {
      11             :         u64                     start;
      12             :         u64                     end;
      13             :         u64                     subtree_max_end;
      14             :         enum page_cache_mode    type;
      15             :         struct rb_node          rb;
      16             : };
      17             : 
      18           0 : static inline char *cattr_name(enum page_cache_mode pcm)
      19             : {
      20           0 :         switch (pcm) {
      21             :         case _PAGE_CACHE_MODE_UC:               return "uncached";
      22             :         case _PAGE_CACHE_MODE_UC_MINUS:         return "uncached-minus";
      23             :         case _PAGE_CACHE_MODE_WB:               return "write-back";
      24             :         case _PAGE_CACHE_MODE_WC:               return "write-combining";
      25             :         case _PAGE_CACHE_MODE_WT:               return "write-through";
      26             :         case _PAGE_CACHE_MODE_WP:               return "write-protected";
      27             :         default:                                return "broken";
      28             :         }
      29             : }
      30             : 
      31             : #ifdef CONFIG_X86_PAT
      32             : extern int memtype_check_insert(struct memtype *entry_new,
      33             :                                 enum page_cache_mode *new_type);
      34             : extern struct memtype *memtype_erase(u64 start, u64 end);
      35             : extern struct memtype *memtype_lookup(u64 addr);
      36             : extern int memtype_copy_nth_element(struct memtype *entry_out, loff_t pos);
      37             : #else
      38           0 : static inline int memtype_check_insert(struct memtype *entry_new,
      39             :                                        enum page_cache_mode *new_type)
      40           0 : { return 0; }
      41           0 : static inline struct memtype *memtype_erase(u64 start, u64 end)
      42           0 : { return NULL; }
      43           0 : static inline struct memtype *memtype_lookup(u64 addr)
      44           0 : { return NULL; }
      45             : static inline int memtype_copy_nth_element(struct memtype *out, loff_t pos)
      46             : { return 0; }
      47             : #endif
      48             : 
      49             : #endif /* __MEMTYPE_H_ */