LXR linux/include/linux/kcov.h

   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
   7struct task_struct;
   8
   9#ifdef CONFIG_KCOV
  10
  11enum 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
  27void kcov_task_init(struct task_struct *t);
  28void kcov_task_exit(struct task_struct *t);
  29
  30#define kcov_prepare_switch(t)                  \
  31do {                                            \
  32        (t)->kcov_mode |= KCOV_IN_CTXSW;        \
  33} while (0)
  34
  35#define kcov_finish_switch(t)                   \
  36do {                                            \
  37        (t)->kcov_mode &= ~KCOV_IN_CTXSW;       \
  38} while (0)
  39
  40/* See Documentation/dev-tools/kcov.rst for usage details. */
  41void kcov_remote_start(u64 handle);
  42void kcov_remote_stop(void);
  43u64 kcov_common_handle(void);
  44
  45static inline void kcov_remote_start_common(u64 id)
  46{
  47        kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_COMMON, id));
  48}
  49
  50static 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
  57static inline void kcov_task_init(struct task_struct *t) {}
  58static inline void kcov_task_exit(struct task_struct *t) {}
  59static inline void kcov_prepare_switch(struct task_struct *t) {}
  60static inline void kcov_finish_switch(struct task_struct *t) {}
  61static inline void kcov_remote_start(u64 handle) {}
  62static inline void kcov_remote_stop(void) {}
  63static inline u64 kcov_common_handle(void)
  64{
  65        return 0;
  66}
  67static inline void kcov_remote_start_common(u64 id) {}
  68static inline void kcov_remote_start_usb(u64 id) {}
  69
  70#endif /* CONFIG_KCOV */
  71#endif /* _LINUX_KCOV_H */
  72