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/* 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:"
/* 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: Pointer to string with event name, description and flags */
__u64 name_args;
/* Output: Bitwise index of the event within the status page */
__u32 status_bit;
/* Output: Index of the event to use when writing data */
__u32 write_index;
} __attribute__((__packed__));
#define DIAG_IOC_MAGIC '*'
/* Requests to register a user_event */
#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*)
/* Requests to delete a user_event */
#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*)
#endif /* _UAPI_LINUX_USER_EVENTS_H */
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