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 #include <asm/compiler.h> 9 #include <asm/mte-def.h> 10 11 #ifndef __ASSEMBLY__ 12 13 #include <linux/bitfield.h> 14 #include <linux/page-flags.h> 15 #include <linux/types.h> 16 17 #include <asm/pgtable-types.h> 18 19 extern u64 gcr_kernel_excl; 20 21 void mte_clear_page_tags(void *addr); 22 unsigned long mte_copy_tags_from_user(void *to, const void __user *from, 23 unsigned long n); 24 unsigned long mte_copy_tags_to_user(void __user *to, void *from, 25 unsigned long n); 26 int mte_save_tags(struct page *page); 27 void mte_save_page_tags(const void *page_addr, void *tag_storage); 28 bool mte_restore_tags(swp_entry_t entry, struct page *page); 29 void mte_restore_page_tags(void *page_addr, const void *tag_storage); 30 void mte_invalidate_tags(int type, pgoff_t offset); 31 void mte_invalidate_tags_area(int type); 32 void *mte_allocate_tag_storage(void); 33 void mte_free_tag_storage(char *storage); 34 35 #ifdef CONFIG_ARM64_MTE 36 37 /* track which pages have valid allocation tags */ 38 #define PG_mte_tagged PG_arch_2 39 40 void mte_sync_tags(pte_t *ptep, pte_t pte); 41 void mte_copy_page_tags(void *kto, const void *kfrom); 42 void flush_mte_state(void); 43 void mte_thread_switch(struct task_struct *next); 44 void mte_suspend_exit(void); 45 long set_mte_ctrl(struct task_struct *task, unsigned long arg); 46 long get_mte_ctrl(struct task_struct *task); 47 int mte_ptrace_copy_tags(struct task_struct *child, long request, 48 unsigned long addr, unsigned long data); 49 50 void mte_assign_mem_tag_range(void *addr, size_t size); 51 52 #else /* CONFIG_ARM64_MTE */ 53 54 /* unused if !CONFIG_ARM64_MTE, silence the compiler */ 55 #define PG_mte_tagged 0 56 57 static inline void mte_sync_tags(pte_t *ptep, pte_t pte) 58 { 59 } 60 static inline void mte_copy_page_tags(void *kto, const void *kfrom) 61 { 62 } 63 static inline void flush_mte_state(void) 64 { 65 } 66 static inline void mte_thread_switch(struct task_struct *next) 67 { 68 } 69 static inline void mte_suspend_exit(void) 70 { 71 } 72 static inline long set_mte_ctrl(struct task_struct *task, unsigned long arg) 73 { 74 return 0; 75 } 76 static inline long get_mte_ctrl(struct task_struct *task) 77 { 78 return 0; 79 } 80 static inline int mte_ptrace_copy_tags(struct task_struct *child, 81 long request, unsigned long addr, 82 unsigned long data) 83 { 84 return -EIO; 85 } 86 87 static inline void mte_assign_mem_tag_range(void *addr, size_t size) 88 { 89 } 90 91 #endif /* CONFIG_ARM64_MTE */ 92 93 #endif /* __ASSEMBLY__ */ 94 #endif /* __ASM_MTE_H */ 95