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 
cattr_name(enum page_cache_mode pcm)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
memtype_check_insert(struct memtype * entry_new,enum page_cache_mode * new_type)38 static inline int memtype_check_insert(struct memtype *entry_new,
39 				       enum page_cache_mode *new_type)
40 { return 0; }
memtype_erase(u64 start,u64 end)41 static inline struct memtype *memtype_erase(u64 start, u64 end)
42 { return NULL; }
memtype_lookup(u64 addr)43 static inline struct memtype *memtype_lookup(u64 addr)
44 { return NULL; }
memtype_copy_nth_element(struct memtype * out,loff_t pos)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