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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _LINUX_KCOV_IOCTLS_H3#define _LINUX_KCOV_IOCTLS_H4 5#include <linux/types.h>6 7/*8 * Argument for KCOV_REMOTE_ENABLE ioctl, see Documentation/dev-tools/kcov.rst9 * 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[];17};18 19#define KCOV_REMOTE_MAX_HANDLES 0x10020 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 calling31 * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument32 * was supposed to be 0 in such a call. So, for reasons of backward33 * 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