[PATCH v7 01/13] user_events: Add UABI header for user access to user_events

Beau Belgrave
2021-12-09T22:32:24Z

Define the basic structs and ioctl commands that allow user processes to
interact with user_events.

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
---
include/uapi/linux/user_events.h | 68 ++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 include/uapi/linux/user_events.h

diff --git a/include/uapi/linux/user_events.h b/include/uapi/linux/user_events.h
new file mode 100644
index 000000000000..5bff99418deb
--- /dev/null
+++ b/include/uapi/linux/user_events.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2021, Microsoft Corporation.
+ *
+ * Authors:
+ * Beau Belgrave <beaub@linux.microsoft.com>
+ */
+#ifndef _UAPI_LINUX_USER_EVENTS_H
+#define _UAPI_LINUX_USER_EVENTS_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#ifdef __KERNEL__
+#include <linux/uio.h>
+#else
+#include <sys/uio.h>
+#endif
+
+#define USER_EVENTS_SYSTEM "user_events"
+#define USER_EVENTS_PREFIX "u:"
+
+/* Bits 0-6 are for known probe types, Bit 7 is for unknown probes */
+#define EVENT_BIT_FTRACE 0
+#define EVENT_BIT_PERF 1
+#define EVENT_BIT_OTHER 7
+
+#define EVENT_STATUS_FTRACE (1 << EVENT_BIT_FTRACE)
+#define EVENT_STATUS_PERF (1 << EVENT_BIT_PERF)
+#define EVENT_STATUS_OTHER (1 << EVENT_BIT_OTHER)
+
+/* Use raw iterator for attached BPF program(s), no affect on ftrace/perf */
+#define FLAG_BPF_ITER (1 << 0)
+
+struct user_reg {
+ __u32 size;
+ __u64 name_args;
+ __u32 status_index;
+ __u32 write_index;
+};
+
+#define DIAG_IOC_MAGIC '*'
+#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*)
+#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*)
+
+enum {
+ USER_BPF_DATA_KERNEL,
+ USER_BPF_DATA_USER,
+ USER_BPF_DATA_ITER,
+};
+
+struct user_bpf_iter {
+ __u32 iov_offset;
+ __u32 nr_segs;
+ const struct iovec *iov;
+};
+
+struct user_bpf_context {
+ __u32 data_type;
+ __u32 data_len;
+ union {
+ void *kdata;
+ void *udata;
+ struct user_bpf_iter *iter;
+ };
+};
+
+#endif /* _UAPI_LINUX_USER_EVENTS_H */
--
2.17.1