1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_KCOV_H 3 #define _LINUX_KCOV_H 4 5 #include <uapi/linux/kcov.h> 6 7 struct task_struct; 8 9 #ifdef CONFIG_KCOV 10 11 enum kcov_mode { 12 /* Coverage collection is not enabled yet. */ 13 KCOV_MODE_DISABLED = 0, 14 /* KCOV was initialized, but tracing mode hasn't been chosen yet. */ 15 KCOV_MODE_INIT = 1, 16 /* 17 * Tracing coverage collection mode. 18 * Covered PCs are collected in a per-task buffer. 19 */ 20 KCOV_MODE_TRACE_PC = 2, 21 /* Collecting comparison operands mode. */ 22 KCOV_MODE_TRACE_CMP = 3, 23 }; 24 25 #define KCOV_IN_CTXSW (1 << 30) 26 27 void kcov_task_init(struct task_struct *t); 28 void kcov_task_exit(struct task_struct *t); 29 30 #define kcov_prepare_switch(t) \ 31 do { \ 32 (t)->kcov_mode |= KCOV_IN_CTXSW; \ 33 } while (0) 34 35 #define kcov_finish_switch(t) \ 36 do { \ 37 (t)->kcov_mode &= ~KCOV_IN_CTXSW; \ 38 } while (0) 39 40 /* See Documentation/dev-tools/kcov.rst for usage details. */ 41 void kcov_remote_start(u64 handle); 42 void kcov_remote_stop(void); 43 u64 kcov_common_handle(void); 44 45 static inline void kcov_remote_start_common(u64 id) 46 { 47 kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_COMMON, id)); 48 } 49 50 static inline void kcov_remote_start_usb(u64 id) 51 { 52 kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_USB, id)); 53 } 54 55 #else 56 57 static inline void kcov_task_init(struct task_struct *t) {} 58 static inline void kcov_task_exit(struct task_struct *t) {} 59 static inline void kcov_prepare_switch(struct task_struct *t) {} 60 static inline void kcov_finish_switch(struct task_struct *t) {} 61 static inline void kcov_remote_start(u64 handle) {} 62 static inline void kcov_remote_stop(void) {} 63 static inline u64 kcov_common_handle(void) 64 { 65 return 0; 66 } 67 static inline void kcov_remote_start_common(u64 id) {} 68 static inline void kcov_remote_start_usb(u64 id) {} 69 70 #endif /* CONFIG_KCOV */ 71 #endif /* _LINUX_KCOV_H */ 72