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 /* Create dynamic location entry within a 32-bit value */ 24 #define DYN_LOC(offset, size) ((size) << 16 | (offset)) 25 26 /* 27 * Describes an event registration and stores the results of the registration. 28 * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum 29 * must set the size and name_args before invocation. 30 */ 31 struct user_reg { 32 33 /* Input: Size of the user_reg structure being used */ 34 __u32 size; 35 36 /* Input: Pointer to string with event name, description and flags */ 37 __u64 name_args; 38 39 /* Output: Bitwise index of the event within the status page */ 40 __u32 status_bit; 41 42 /* Output: Index of the event to use when writing data */ 43 __u32 write_index; 44 } __attribute__((__packed__)); 45 46 #define DIAG_IOC_MAGIC '*' 47 48 /* Requests to register a user_event */ 49 #define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*) 50 51 /* Requests to delete a user_event */ 52 #define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*) 53 54 #endif /* _UAPI_LINUX_USER_EVENTS_H */ 55