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 static inline char *cattr_name(enum page_cache_mode pcm) 19 { 20 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 static inline int memtype_check_insert(struct memtype *entry_new, 39 enum page_cache_mode *new_type) 40 { return 0; } 41 static inline struct memtype *memtype_erase(u64 start, u64 end) 42 { return NULL; } 43 static inline struct memtype *memtype_lookup(u64 addr) 44 { 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_ */ 50
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