1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * Copyright (c) 2021, Microsoft Corporation.
6 * Beau Belgrave <beaub@linux.microsoft.com>
8 #ifndef _UAPI_LINUX_USER_EVENTS_H
9 #define _UAPI_LINUX_USER_EVENTS_H
11 #include <linux/types.h>
12 #include <linux/ioctl.h>
15 #include <linux/uio.h>
20 #define USER_EVENTS_SYSTEM "user_events"
21 #define USER_EVENTS_PREFIX "u:"
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
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)
32 /* Create dynamic location entry within a 32-bit value */
33 #define DYN_LOC(offset, size) ((size) << 16 | (offset))
35 /* Use raw iterator for attached BPF program(s), no affect on ftrace/perf */
36 #define FLAG_BPF_ITER (1 << 0)
39 * Describes an event registration and stores the results of the registration.
40 * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum
41 * must set the size and name_args before invocation.
45 /* Input: Size of the user_reg structure being used */
48 /* Input: Pointer to string with event name, description and flags */
51 /* Output: Byte index of the event within the status page */
54 /* Output: Index of the event to use when writing data */
58 #define DIAG_IOC_MAGIC '*'
60 /* Requests to register a user_event */
61 #define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*)
63 /* Requests to delete a user_event */
64 #define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*)
66 /* Data type that was passed to the BPF program */
68 /* Data resides in kernel space */
71 /* Data resides in user space */
74 /* Data is a pointer to a user_bpf_iter structure */
79 * Describes an iovec iterator that BPF programs can use to access data for
80 * a given user_event write() / writev() call.
82 struct user_bpf_iter {
84 /* Offset of the data within the first iovec */
87 /* Number of iovec structures */
90 /* Pointer to iovec structures */
91 const struct iovec *iov;
94 /* Context that BPF programs receive when attached to a user_event */
95 struct user_bpf_context {
97 /* Data type being passed (see union below) */
100 /* Length of the data */
103 /* Pointer to data, varies by data type */
105 /* Kernel data (data_type == USER_BPF_DATA_KERNEL) */
108 /* User data (data_type == USER_BPF_DATA_USER) */
111 /* Direct iovec (data_type == USER_BPF_DATA_ITER) */
112 struct user_bpf_iter *iter;
116 #endif /* _UAPI_LINUX_USER_EVENTS_H */