1 files changed, 81 insertions, 0 deletions
diff --git a/include/uapi/linux/user_events.h b/include/uapi/linux/user_events.h
new file mode 100644
index 000000000000..2984aae4a2b4
--- /dev/null
+++ b/include/uapi/linux/user_events.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2021-2022, 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>
+
+#define USER_EVENTS_SYSTEM "user_events"
+#define USER_EVENTS_PREFIX "u:"
+
+/* Create dynamic location entry within a 32-bit value */
+#define DYN_LOC(offset, size) ((size) << 16 | (offset))
+
+/*
+ * Describes an event registration and stores the results of the registration.
+ * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum
+ * must set the size and name_args before invocation.
+ */
+struct user_reg {
+
+	/* Input: Size of the user_reg structure being used */
+	__u32	size;
+
+	/* Input: Bit in enable address to use */
+	__u8	enable_bit;
+
+	/* Input: Enable size in bytes at address */
+	__u8	enable_size;
+
+	/* Input: Flags for future use, set to 0 */
+	__u16	flags;
+
+	/* Input: Address to update when enabled */
+	__u64	enable_addr;
+
+	/* Input: Pointer to string with event name, description and flags */
+	__u64	name_args;
+
+	/* Output: Index of the event to use when writing data */
+	__u32	write_index;
+} __attribute__((__packed__));
+
+/*
+ * Describes an event unregister, callers must set the size, address and bit.
+ * This structure is passed to the DIAG_IOCSUNREG ioctl to disable bit updates.
+ */
+struct user_unreg {
+	/* Input: Size of the user_unreg structure being used */
+	__u32	size;
+
+	/* Input: Bit to unregister */
+	__u8	disable_bit;
+
+	/* Input: Reserved, set to 0 */
+	__u8	__reserved;
+
+	/* Input: Reserved, set to 0 */
+	__u16	__reserved2;
+
+	/* Input: Address to unregister */
+	__u64	disable_addr;
+} __attribute__((__packed__));
+
+#define DIAG_IOC_MAGIC '*'
+
+/* Request to register a user_event */
+#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg *)
+
+/* Request to delete a user_event */
+#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char *)
+
+/* Requests to unregister a user_event */
+#define DIAG_IOCSUNREG _IOW(DIAG_IOC_MAGIC, 2, struct user_unreg*)
+
+#endif /* _UAPI_LINUX_USER_EVENTS_H */