GNU Linux-libre 4.14.266-gnu1
[releases.git] / arch / x86 / mm / pat_internal.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PAT_INTERNAL_H_
3 #define __PAT_INTERNAL_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 rbt_memtype_check_insert(struct memtype *new,
33                                         enum page_cache_mode *new_type);
34 extern struct memtype *rbt_memtype_erase(u64 start, u64 end);
35 extern struct memtype *rbt_memtype_lookup(u64 addr);
36 extern int rbt_memtype_copy_nth_element(struct memtype *out, loff_t pos);
37 #else
38 static inline int rbt_memtype_check_insert(struct memtype *new,
39                                         enum page_cache_mode *new_type)
40 { return 0; }
41 static inline struct memtype *rbt_memtype_erase(u64 start, u64 end)
42 { return NULL; }
43 static inline struct memtype *rbt_memtype_lookup(u64 addr)
44 { return NULL; }
45 static inline int rbt_memtype_copy_nth_element(struct memtype *out, loff_t pos)
46 { return 0; }
47 #endif
48
49 #endif /* __PAT_INTERNAL_H_ */