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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (c) 2021-2022, Microsoft Corporation.
*
* Authors:
* Beau Belgrave <beaub@linux.microsoft.com>
*/
#ifndef _LINUX_USER_EVENTS_H
#define _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))
/* List of supported registration flags */
enum user_reg_flag {
/* Event will not delete upon last reference closing */
USER_EVENT_REG_PERSIST = 1U << 0,
/* This value or above is currently non-ABI */
USER_EVENT_REG_MAX = 1U << 1,
};
/*
* 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 to use, if any */
__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 /* _LINUX_USER_EVENTS_H */
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