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user_events.h
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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 */