mm/pat/memtype.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __MEMTYPE_H_
0003 #define __MEMTYPE_H_
0004
0005 extern int pat_debug_enable;
0006
0007 #define dprintk(fmt, arg...) \
0008     do { if (pat_debug_enable) pr_info("x86/PAT: " fmt, ##arg); } while (0)
0009
0010 struct memtype {
0011     u64         start;
0012     u64         end;
0013     u64         subtree_max_end;
0014     enum page_cache_mode    type;
0015     struct rb_node      rb;
0016 };
0017
0018 static inline char *cattr_name(enum page_cache_mode pcm)
0019 {
0020     switch (pcm) {
0021     case _PAGE_CACHE_MODE_UC:       return "uncached";
0022     case _PAGE_CACHE_MODE_UC_MINUS:     return "uncached-minus";
0023     case _PAGE_CACHE_MODE_WB:       return "write-back";
0024     case _PAGE_CACHE_MODE_WC:       return "write-combining";
0025     case _PAGE_CACHE_MODE_WT:       return "write-through";
0026     case _PAGE_CACHE_MODE_WP:       return "write-protected";
0027     default:                return "broken";
0028     }
0029 }
0030
0031 #ifdef CONFIG_X86_PAT
0032 extern int memtype_check_insert(struct memtype *entry_new,
0033                 enum page_cache_mode *new_type);
0034 extern struct memtype *memtype_erase(u64 start, u64 end);
0035 extern struct memtype *memtype_lookup(u64 addr);
0036 extern int memtype_copy_nth_element(struct memtype *entry_out, loff_t pos);
0037 #else
0038 static inline int memtype_check_insert(struct memtype *entry_new,
0039                        enum page_cache_mode *new_type)
0040 { return 0; }
0041 static inline struct memtype *memtype_erase(u64 start, u64 end)
0042 { return NULL; }
0043 static inline struct memtype *memtype_lookup(u64 addr)
0044 { return NULL; }
0045 static inline int memtype_copy_nth_element(struct memtype *out, loff_t pos)
0046 { return 0; }
0047 #endif
0048
0049 #endif /* __MEMTYPE_H_ */