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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 */
31struct 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 */