diff options
| author | Beau Belgrave <beaub@linux.microsoft.com> | 2023-03-28 16:52:12 -0700 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-03-29 06:52:08 -0400 |
| commit | dcb8177c13953872c9e5ce4a99b63a87a3c2f683 (patch) | |
| tree | a5b552e9688432c2d5bf0ccf3f2ce26afb479467 /include/uapi/linux/user_events.h | |
| parent | 81f8fb65499817a4d1d5d66d9e74a903061ce637 (diff) | |
tracing/user_events: Add ioctl for disabling addresses
Enablements are now tracked by the lifetime of the task/mm. User
processes need to be able to disable their addresses if tracing is
requested to be turned off. Before unmapping the page would suffice.
However, we now need a stronger contract. Add an ioctl to enable this.
A new flag bit is added, freeing, to user_event_enabler to ensure that
if the event is attempted to be removed while a fault is being handled
that the remove is delayed until after the fault is reattempted.
Link: https://lkml.kernel.org/r/20230328235219.203-6-beaub@linux.microsoft.com
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/uapi/linux/user_events.h')
| -rw-r--r-- | include/uapi/linux/user_events.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/uapi/linux/user_events.h b/include/uapi/linux/user_events.h index 22521bc622db..3e7275e3234a 100644 --- a/include/uapi/linux/user_events.h +++ b/include/uapi/linux/user_events.h @@ -46,6 +46,27 @@ struct user_reg { __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 */ @@ -54,4 +75,7 @@ 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 */ |