| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_KCOV_H |
| #define _LINUX_KCOV_H |
| |
| #include <uapi/linux/kcov.h> |
| |
| struct task_struct; |
| |
| #ifdef CONFIG_KCOV |
| |
| enum kcov_mode { |
| /* Coverage collection is not enabled yet. */ |
| KCOV_MODE_DISABLED = 0, |
| /* KCOV was initialized, but tracing mode hasn't been chosen yet. */ |
| KCOV_MODE_INIT = 1, |
| /* |
| * Tracing coverage collection mode. |
| * Covered PCs are collected in a per-task buffer. |
| */ |
| KCOV_MODE_TRACE_PC = 2, |
| /* Collecting comparison operands mode. */ |
| KCOV_MODE_TRACE_CMP = 3, |
| }; |
| |
| #define KCOV_IN_CTXSW (1 << 30) |
| |
| void kcov_task_init(struct task_struct *t); |
| void kcov_task_exit(struct task_struct *t); |
| |
| #define kcov_prepare_switch(t) \ |
| do { \ |
| (t)->kcov_mode |= KCOV_IN_CTXSW; \ |
| } while (0) |
| |
| #define kcov_finish_switch(t) \ |
| do { \ |
| (t)->kcov_mode &= ~KCOV_IN_CTXSW; \ |
| } while (0) |
| |
| /* See Documentation/dev-tools/kcov.rst for usage details. */ |
| void kcov_remote_start(u64 handle); |
| void kcov_remote_stop(void); |
| u64 kcov_common_handle(void); |
| |
| static inline void kcov_remote_start_common(u64 id) |
| { |
| kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_COMMON, id)); |
| } |
| |
| static inline void kcov_remote_start_usb(u64 id) |
| { |
| kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_USB, id)); |
| } |
| |
| /* |
| * The softirq flavor of kcov_remote_*() functions is introduced as a temporary |
| * work around for kcov's lack of nested remote coverage sections support in |
| * task context. Adding suport for nested sections is tracked in: |
| * https://bugzilla.kernel.org/show_bug.cgi?id=210337 |
| */ |
| |
| static inline void kcov_remote_start_usb_softirq(u64 id) |
| { |
| if (in_serving_softirq()) |
| kcov_remote_start_usb(id); |
| } |
| |
| static inline void kcov_remote_stop_softirq(void) |
| { |
| if (in_serving_softirq()) |
| kcov_remote_stop(); |
| } |
| |
| #else |
| |
| static inline void kcov_task_init(struct task_struct *t) {} |
| static inline void kcov_task_exit(struct task_struct *t) {} |
| static inline void kcov_prepare_switch(struct task_struct *t) {} |
| static inline void kcov_finish_switch(struct task_struct *t) {} |
| static inline void kcov_remote_start(u64 handle) {} |
| static inline void kcov_remote_stop(void) {} |
| static inline u64 kcov_common_handle(void) |
| { |
| return 0; |
| } |
| static inline void kcov_remote_start_common(u64 id) {} |
| static inline void kcov_remote_start_usb(u64 id) {} |
| static inline void kcov_remote_start_usb_softirq(u64 id) {} |
| static inline void kcov_remote_stop_softirq(void) {} |
| |
| #endif /* CONFIG_KCOV */ |
| #endif /* _LINUX_KCOV_H */ |