1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2#ifndef _LINUX_KCOV_IOCTLS_H 3#define _LINUX_KCOV_IOCTLS_H 4 5#include <linux/types.h> 6 7/* 8 * Argument for KCOV_REMOTE_ENABLE ioctl, see Documentation/dev-tools/kcov.rst 9 * and the comment before kcov_remote_start() for usage details. 10 */ 11struct kcov_remote_arg { 12 __u32 trace_mode; /* KCOV_TRACE_PC or KCOV_TRACE_CMP */ 13 __u32 area_size; /* Length of coverage buffer in words */ 14 __u32 num_handles; /* Size of handles array */ 15 __aligned_u64 common_handle; 16 __aligned_u64 handles[0]; 17}; 18 19#define KCOV_REMOTE_MAX_HANDLES 0x100 20 21#define KCOV_INIT_TRACE _IOR('c', 1, unsigned long) 22#define KCOV_ENABLE _IO('c', 100) 23#define KCOV_DISABLE _IO('c', 101) 24#define KCOV_REMOTE_ENABLE _IOW('c', 102, struct kcov_remote_arg) 25 26enum { 27 /* 28 * Tracing coverage collection mode. 29 * Covered PCs are collected in a per-task buffer. 30 * In new KCOV version the mode is chosen by calling 31 * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument 32 * was supposed to be 0 in such a call. So, for reasons of backward 33 * compatibility, we have chosen the value KCOV_TRACE_PC to be 0. 34 */ 35 KCOV_TRACE_PC = 0, 36 /* Collecting comparison operands mode. */ 37 KCOV_TRACE_CMP = 1, 38}; 39 40/* 41 * The format for the types of collected comparisons. 42 * 43 * Bit 0 shows whether one of the arguments is a compile-time constant. 44 * Bits 1 & 2 contain log2 of the argument size, up to 8 bytes. 45 */ 46#define KCOV_CMP_CONST (1 << 0) 47#define KCOV_CMP_SIZE(n) ((n) << 1) 48#define KCOV_CMP_MASK KCOV_CMP_SIZE(3) 49 50#define KCOV_SUBSYSTEM_COMMON (0x00ull << 56) 51#define KCOV_SUBSYSTEM_USB (0x01ull << 56) 52 53#define KCOV_SUBSYSTEM_MASK (0xffull << 56) 54#define KCOV_INSTANCE_MASK (0xffffffffull) 55 56static inline __u64 kcov_remote_handle(__u64 subsys, __u64 inst) 57{ 58 if (subsys & ~KCOV_SUBSYSTEM_MASK || inst & ~KCOV_INSTANCE_MASK) 59 return 0; 60 return subsys | inst; 61} 62 63#endif /* _LINUX_KCOV_IOCTLS_H */ 64