diff options
Diffstat (limited to 'arch/x86/mm/pat/memtype.h')
| -rw-r--r-- | arch/x86/mm/pat/memtype.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/x86/mm/pat/memtype.h b/arch/x86/mm/pat/memtype.h new file mode 100644 index 000000000000..cacecdbceb55 --- /dev/null +++ b/arch/x86/mm/pat/memtype.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __MEMTYPE_H_ +#define __MEMTYPE_H_ + +extern int pat_debug_enable; + +#define dprintk(fmt, arg...) \ + do { if (pat_debug_enable) pr_info("x86/PAT: " fmt, ##arg); } while (0) + +struct memtype { + u64 start; + u64 end; + u64 subtree_max_end; + enum page_cache_mode type; + struct rb_node rb; +}; + +static inline char *cattr_name(enum page_cache_mode pcm) +{ + switch (pcm) { + case _PAGE_CACHE_MODE_UC: return "uncached"; + case _PAGE_CACHE_MODE_UC_MINUS: return "uncached-minus"; + case _PAGE_CACHE_MODE_WB: return "write-back"; + case _PAGE_CACHE_MODE_WC: return "write-combining"; + case _PAGE_CACHE_MODE_WT: return "write-through"; + case _PAGE_CACHE_MODE_WP: return "write-protected"; + default: return "broken"; + } +} + +#ifdef CONFIG_X86_PAT +extern int memtype_check_insert(struct memtype *entry_new, + enum page_cache_mode *new_type); +extern struct memtype *memtype_erase(u64 start, u64 end); +extern struct memtype *memtype_lookup(u64 addr); +extern int memtype_copy_nth_element(struct memtype *entry_out, loff_t pos); +#else +static inline int memtype_check_insert(struct memtype *entry_new, + enum page_cache_mode *new_type) +{ return 0; } +static inline struct memtype *memtype_erase(u64 start, u64 end) +{ return NULL; } +static inline struct memtype *memtype_lookup(u64 addr) +{ return NULL; } +static inline int memtype_copy_nth_element(struct memtype *out, loff_t pos) +{ return 0; } +#endif + +#endif /* __MEMTYPE_H_ */ |