1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __MEMTYPE_H_
3#define __MEMTYPE_H_
4
5extern 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
10struct 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
18static 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
32extern int memtype_check_insert(struct memtype *entry_new,
33 enum page_cache_mode *new_type);
34extern struct memtype *memtype_erase(u64 start, u64 end);
35extern struct memtype *memtype_lookup(u64 addr);
36extern int memtype_copy_nth_element(struct memtype *entry_out, loff_t pos);
37#else
38static inline int memtype_check_insert(struct memtype *entry_new,
39 enum page_cache_mode *new_type)
40{ return 0; }
41static inline struct memtype *memtype_erase(u64 start, u64 end)
42{ return NULL; }
43static inline struct memtype *memtype_lookup(u64 addr)
44{ return NULL; }
45static inline int memtype_copy_nth_element(struct memtype *out, loff_t pos)
46{ return 0; }
47#endif
48
49#endif /* __MEMTYPE_H_ */
50