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