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 | |