user_events.h (1688B)
1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2/* 3 * Copyright (c) 2021, Microsoft Corporation. 4 * 5 * Authors: 6 * Beau Belgrave <beaub@linux.microsoft.com> 7 */ 8#ifndef _UAPI_LINUX_USER_EVENTS_H 9#define _UAPI_LINUX_USER_EVENTS_H 10 11#include <linux/types.h> 12#include <linux/ioctl.h> 13 14#ifdef __KERNEL__ 15#include <linux/uio.h> 16#else 17#include <sys/uio.h> 18#endif 19 20#define USER_EVENTS_SYSTEM "user_events" 21#define USER_EVENTS_PREFIX "u:" 22 23/* Bits 0-6 are for known probe types, Bit 7 is for unknown probes */ 24#define EVENT_BIT_FTRACE 0 25#define EVENT_BIT_PERF 1 26#define EVENT_BIT_OTHER 7 27 28#define EVENT_STATUS_FTRACE (1 << EVENT_BIT_FTRACE) 29#define EVENT_STATUS_PERF (1 << EVENT_BIT_PERF) 30#define EVENT_STATUS_OTHER (1 << EVENT_BIT_OTHER) 31 32/* Create dynamic location entry within a 32-bit value */ 33#define DYN_LOC(offset, size) ((size) << 16 | (offset)) 34 35/* 36 * Describes an event registration and stores the results of the registration. 37 * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum 38 * must set the size and name_args before invocation. 39 */ 40struct user_reg { 41 42 /* Input: Size of the user_reg structure being used */ 43 __u32 size; 44 45 /* Input: Pointer to string with event name, description and flags */ 46 __u64 name_args; 47 48 /* Output: Byte index of the event within the status page */ 49 __u32 status_index; 50 51 /* Output: Index of the event to use when writing data */ 52 __u32 write_index; 53}; 54 55#define DIAG_IOC_MAGIC '*' 56 57/* Requests to register a user_event */ 58#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*) 59 60/* Requests to delete a user_event */ 61#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*) 62 63#endif /* _UAPI_LINUX_USER_EVENTS_H */