1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020 ARM Ltd. 4 */ 5 #ifndef __ASM_MTE_H 6 #define __ASM_MTE_H 7 8 #define MTE_GRANULE_SIZE UL(16) 9 #define MTE_GRANULE_MASK (~(MTE_GRANULE_SIZE - 1)) 10 #define MTE_TAG_SHIFT 56 11 #define MTE_TAG_SIZE 4 12 13 #ifndef __ASSEMBLY__ 14 15 #include <linux/page-flags.h> 16 17 #include <asm/pgtable-types.h> 18 19 void mte_clear_page_tags(void *addr); 20 unsigned long mte_copy_tags_from_user(void *to, const void __user *from, 21 unsigned long n); 22 unsigned long mte_copy_tags_to_user(void __user *to, void *from, 23 unsigned long n); 24 int mte_save_tags(struct page *page); 25 void mte_save_page_tags(const void *page_addr, void *tag_storage); 26 bool mte_restore_tags(swp_entry_t entry, struct page *page); 27 void mte_restore_page_tags(void *page_addr, const void *tag_storage); 28 void mte_invalidate_tags(int type, pgoff_t offset); 29 void mte_invalidate_tags_area(int type); 30 void *mte_allocate_tag_storage(void); 31 void mte_free_tag_storage(char *storage); 32 33 #ifdef CONFIG_ARM64_MTE 34 35 /* track which pages have valid allocation tags */ 36 #define PG_mte_tagged PG_arch_2 37 38 void mte_sync_tags(pte_t *ptep, pte_t pte); 39 void mte_copy_page_tags(void *kto, const void *kfrom); 40 void flush_mte_state(void); 41 void mte_thread_switch(struct task_struct *next); 42 void mte_suspend_exit(void); 43 long set_mte_ctrl(struct task_struct *task, unsigned long arg); 44 long get_mte_ctrl(struct task_struct *task); 45 int mte_ptrace_copy_tags(struct task_struct *child, long request, 46 unsigned long addr, unsigned long data); 47 48 #else 49 50 /* unused if !CONFIG_ARM64_MTE, silence the compiler */ 51 #define PG_mte_tagged 0 52 53 static inline void mte_sync_tags(pte_t *ptep, pte_t pte) 54 { 55 } 56 static inline void mte_copy_page_tags(void *kto, const void *kfrom) 57 { 58 } 59 static inline void flush_mte_state(void) 60 { 61 } 62 static inline void mte_thread_switch(struct task_struct *next) 63 { 64 } 65 static inline void mte_suspend_exit(void) 66 { 67 } 68 static inline long set_mte_ctrl(struct task_struct *task, unsigned long arg) 69 { 70 return 0; 71 } 72 static inline long get_mte_ctrl(struct task_struct *task) 73 { 74 return 0; 75 } 76 static inline int mte_ptrace_copy_tags(struct task_struct *child, 77 long request, unsigned long addr, 78 unsigned long data) 79 { 80 return -EIO; 81 } 82 83 #endif 84 85 #endif /* __ASSEMBLY__ */ 86 #endif /* __ASM_MTE_H */ 87