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tracing/user_events: Store register flags on events

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Currently we don't have any available flags for user processes to use to
indicate options for user_events. We will soon have a flag to indicate
the event should or should not auto-delete once it's not being used by
anyone.

Add a reg_flags field to user_events and parameters to existing
functions to allow for this in future patches.

Link: https://lkml.kernel.org/r/20230614163336.5797-2-beaub@linux.microsoft.com

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Beau Belgrave 2023-06-14 09:33:31 -07:00 committed by Steven Rostedt (Google)
parent ed0e0ae0c9
commit b08d725805
1 changed files with 10 additions and 6 deletions
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16
kernel/trace/trace_events_user.c
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@ -87,6 +87,7 @@ struct user_event {
struct list_head validators;
refcount_t refcnt;
int min_size;
int reg_flags;
char status;
};
@ -165,7 +166,7 @@ typedef void (*user_event_func_t) (struct user_event *user, struct iov_iter *i,
static int user_event_parse(struct user_event_group *group, char *name,
char *args, char *flags,
struct user_event **newuser);
struct user_event **newuser, int reg_flags);
static struct user_event_mm *user_event_mm_get(struct user_event_mm *mm);
static struct user_event_mm *user_event_mm_get_all(struct user_event *user);
@ -810,7 +811,8 @@ static struct list_head *user_event_get_fields(struct trace_event_call *call)
* Upon success user_event has its ref count increased by 1.
*/
static int user_event_parse_cmd(struct user_event_group *group,
char *raw_command, struct user_event **newuser)
char *raw_command, struct user_event **newuser,
int reg_flags)
{
char *name = raw_command;
char *args = strpbrk(name, " ");
@ -824,7 +826,7 @@ static int user_event_parse_cmd(struct user_event_group *group,
if (flags)
*flags++ = '\0';
return user_event_parse(group, name, args, flags, newuser);
return user_event_parse(group, name, args, flags, newuser, reg_flags);
}
static int user_field_array_size(const char *type)
@ -1588,7 +1590,7 @@ static int user_event_create(const char *raw_command)
mutex_lock(&group->reg_mutex);
ret = user_event_parse_cmd(group, name, &user);
ret = user_event_parse_cmd(group, name, &user, 0);
if (!ret)
refcount_dec(&user->refcnt);
@ -1751,7 +1753,7 @@ static int user_event_trace_register(struct user_event *user)
*/
static int user_event_parse(struct user_event_group *group, char *name,
char *args, char *flags,
struct user_event **newuser)
struct user_event **newuser, int reg_flags)
{
int ret;
u32 key;
@ -1846,6 +1848,8 @@ static int user_event_parse(struct user_event_group *group, char *name,
if (ret)
goto put_user_lock;
user->reg_flags = reg_flags;
/* Ensure we track self ref and caller ref (2) */
refcount_set(&user->refcnt, 2);
@ -2144,7 +2148,7 @@ static long user_events_ioctl_reg(struct user_event_file_info *info,
return ret;
}
ret = user_event_parse_cmd(info->group, name, &user);
ret = user_event_parse_cmd(info->group, name, &user, reg.flags);
if (ret) {
kfree(name);