^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * trace_events_trigger - trace event triggers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "trace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static LIST_HEAD(trigger_commands);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static DEFINE_MUTEX(trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) void trigger_data_free(struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) if (data->cmd_ops->set_filter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) data->cmd_ops->set_filter(NULL, data, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* make sure current triggers exit before free */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) tracepoint_synchronize_unregister();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * event_triggers_call - Call triggers associated with a trace event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * @rec: The trace entry for the event, NULL for unconditional invocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * For each trigger associated with an event, invoke the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * function registered with the associated trigger command. If rec is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * non-NULL, it means that the trigger requires further processing and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * shouldn't be unconditionally invoked. If rec is non-NULL and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * trigger has a filter associated with it, rec will checked against
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * the filter and if the record matches the trigger will be invoked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * If the trigger is a 'post_trigger', meaning it shouldn't be invoked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * in any case until the current event is written, the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * function isn't invoked but the bit associated with the deferred
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * trigger is set in the return value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * Returns an enum event_trigger_type value containing a set bit for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * any trigger that should be deferred, ETT_NONE if nothing to defer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Called from tracepoint handlers (with rcu_read_lock_sched() held).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Return: an enum event_trigger_type value containing a set bit for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * any trigger that should be deferred, ETT_NONE if nothing to defer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) enum event_trigger_type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) event_triggers_call(struct trace_event_file *file, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) enum event_trigger_type tt = ETT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct event_filter *filter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (list_empty(&file->triggers))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return tt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) list_for_each_entry_rcu(data, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (data->paused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (!rec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) data->ops->func(data, rec, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) filter = rcu_dereference_sched(data->filter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (filter && !filter_match_preds(filter, rec))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (event_command_post_trigger(data->cmd_ops)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) tt |= data->cmd_ops->trigger_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) data->ops->func(data, rec, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return tt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) EXPORT_SYMBOL_GPL(event_triggers_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * event_triggers_post_call - Call 'post_triggers' for a trace event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * @tt: enum event_trigger_type containing a set bit for each trigger to invoke
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * For each trigger associated with an event, invoke the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * function registered with the associated trigger command, if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * corresponding bit is set in the tt enum passed into this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * See @event_triggers_call for details on how those bits are set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * Called from tracepoint handlers (with rcu_read_lock_sched() held).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) event_triggers_post_call(struct trace_event_file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) enum event_trigger_type tt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) list_for_each_entry_rcu(data, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (data->paused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (data->cmd_ops->trigger_type & tt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) data->ops->func(data, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) EXPORT_SYMBOL_GPL(event_triggers_post_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #define SHOW_AVAILABLE_TRIGGERS (void *)(1UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static void *trigger_next(struct seq_file *m, void *t, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct trace_event_file *event_file = event_file_data(m->private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (t == SHOW_AVAILABLE_TRIGGERS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) (*pos)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return seq_list_next(t, &event_file->triggers, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void *trigger_start(struct seq_file *m, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct trace_event_file *event_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* ->stop() is called even if ->start() fails */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) mutex_lock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) event_file = event_file_data(m->private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (unlikely(!event_file))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (list_empty(&event_file->triggers))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return seq_list_start(&event_file->triggers, *pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static void trigger_stop(struct seq_file *m, void *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static int trigger_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct event_command *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (v == SHOW_AVAILABLE_TRIGGERS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) seq_puts(m, "# Available triggers:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) seq_putc(m, '#');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) mutex_lock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) list_for_each_entry_reverse(p, &trigger_commands, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) seq_printf(m, " %s", p->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) mutex_unlock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) data = list_entry(v, struct event_trigger_data, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) data->ops->print(m, data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static const struct seq_operations event_triggers_seq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .start = trigger_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .next = trigger_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) .stop = trigger_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .show = trigger_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int event_trigger_regex_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ret = security_locked_down(LOCKDOWN_TRACEFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) mutex_lock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (unlikely(!event_file_data(file))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if ((file->f_mode & FMODE_WRITE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) (file->f_flags & O_TRUNC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct trace_event_file *event_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct event_command *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) event_file = event_file_data(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) list_for_each_entry(p, &trigger_commands, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (p->unreg_all)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) p->unreg_all(event_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (file->f_mode & FMODE_READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ret = seq_open(file, &event_triggers_seq_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct seq_file *m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) m->private = file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) int trigger_process_regex(struct trace_event_file *file, char *buff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) char *command, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct event_command *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) next = buff = skip_spaces(buff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) command = strsep(&next, ": \t");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) next = skip_spaces(next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (!*next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) command = (command[0] != '!') ? command : command + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) mutex_lock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) list_for_each_entry(p, &trigger_commands, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (strcmp(p->name, command) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ret = p->func(p, file, buff, command, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) mutex_unlock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static ssize_t event_trigger_regex_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) const char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) size_t cnt, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct trace_event_file *event_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (!cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (cnt >= PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) buf = memdup_user_nul(ubuf, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (IS_ERR(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return PTR_ERR(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) strim(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mutex_lock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) event_file = event_file_data(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (unlikely(!event_file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) ret = trigger_process_regex(event_file, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) *ppos += cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ret = cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static int event_trigger_regex_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) mutex_lock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (file->f_mode & FMODE_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) seq_release(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) mutex_unlock(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) event_trigger_write(struct file *filp, const char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) size_t cnt, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) return event_trigger_regex_write(filp, ubuf, cnt, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) event_trigger_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) /* Checks for tracefs lockdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return event_trigger_regex_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) event_trigger_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return event_trigger_regex_release(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) const struct file_operations event_trigger_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) .open = event_trigger_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) .write = event_trigger_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) .llseek = tracing_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .release = event_trigger_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Currently we only register event commands from __init, so mark this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * __init too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) __init int register_event_command(struct event_command *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct event_command *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mutex_lock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) list_for_each_entry(p, &trigger_commands, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (strcmp(cmd->name, p->name) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) list_add(&cmd->list, &trigger_commands);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) mutex_unlock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * Currently we only unregister event commands from __init, so mark
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * this __init too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) __init int unregister_event_command(struct event_command *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct event_command *p, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) mutex_lock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) list_for_each_entry_safe(p, n, &trigger_commands, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (strcmp(cmd->name, p->name) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) list_del_init(&p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) mutex_unlock(&trigger_cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * event_trigger_print - Generic event_trigger_ops @print implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * @name: The name of the event trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * @m: The seq_file being printed to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * @data: Trigger-specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * @filter_str: filter_str to print, if present
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * Common implementation for event triggers to print themselves.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * Usually wrapped by a function that simply sets the @name of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * trigger command and then invokes this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * Return: 0 on success, errno otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) event_trigger_print(const char *name, struct seq_file *m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) void *data, char *filter_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) long count = (long)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) seq_puts(m, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (count == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) seq_puts(m, ":unlimited");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) seq_printf(m, ":count=%ld", count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (filter_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) seq_printf(m, " if %s\n", filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * event_trigger_init - Generic event_trigger_ops @init implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * @ops: The trigger ops associated with the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * @data: Trigger-specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * Common implementation of event trigger initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * Usually used directly as the @init method in event trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * Return: 0 on success, errno otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) int event_trigger_init(struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) data->ref++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * event_trigger_free - Generic event_trigger_ops @free implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * @ops: The trigger ops associated with the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * @data: Trigger-specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * Common implementation of event trigger de-initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * Usually used directly as the @free method in event trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) event_trigger_free(struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (WARN_ON_ONCE(data->ref <= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) data->ref--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (!data->ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) trigger_data_free(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) int trace_event_trigger_enable_disable(struct trace_event_file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) int trigger_enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (trigger_enable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (atomic_inc_return(&file->tm_ref) > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) set_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) ret = trace_event_enable_disable(file, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (atomic_dec_return(&file->tm_ref) > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) clear_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ret = trace_event_enable_disable(file, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * clear_event_triggers - Clear all triggers associated with a trace array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * @tr: The trace array to clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * For each trigger, the triggering event has its tm_ref decremented
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) * via trace_event_trigger_enable_disable(), and any associated event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * (in the case of enable/disable_event triggers) will have its sm_ref
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * decremented via free()->trace_event_enable_disable(). That
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * combination effectively reverses the soft-mode/trigger state added
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) * by trigger registration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * Must be called with event_mutex held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) clear_event_triggers(struct trace_array *tr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct trace_event_file *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) list_for_each_entry(file, &tr->events, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) struct event_trigger_data *data, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) list_for_each_entry_safe(data, n, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) trace_event_trigger_enable_disable(file, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) list_del_rcu(&data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (data->ops->free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) data->ops->free(data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * update_cond_flag - Set or reset the TRIGGER_COND bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * If an event has triggers and any of those triggers has a filter or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * a post_trigger, trigger invocation needs to be deferred until after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * the current event has logged its data, and the event should have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * cleared.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) void update_cond_flag(struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) bool set_cond = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) lockdep_assert_held(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) list_for_each_entry(data, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (data->filter || event_command_post_trigger(data->cmd_ops) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) event_command_needs_rec(data->cmd_ops)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) set_cond = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (set_cond)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * register_trigger - Generic event_command @reg implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * @glob: The raw string used to register the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * @ops: The trigger ops associated with the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) * @data: Trigger-specific data to associate with the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * Common implementation for event trigger registration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * Usually used directly as the @reg method in event command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * Return: 0 on success, errno otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) static int register_trigger(char *glob, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) struct event_trigger_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct event_trigger_data *test;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) lockdep_assert_held(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) list_for_each_entry(test, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (data->ops->init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) ret = data->ops->init(data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) list_add_rcu(&data->list, &file->triggers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) ret++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (trace_event_trigger_enable_disable(file, 1) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) list_del_rcu(&data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) ret--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * unregister_trigger - Generic event_command @unreg implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * @glob: The raw string used to register the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * @ops: The trigger ops associated with the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * @test: Trigger-specific data used to find the trigger to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * Common implementation for event trigger unregistration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * Usually used directly as the @unreg method in event command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct event_trigger_data *test,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) bool unregistered = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) lockdep_assert_held(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) list_for_each_entry(data, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) unregistered = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) list_del_rcu(&data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) trace_event_trigger_enable_disable(file, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (unregistered && data->ops->free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) data->ops->free(data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * event_trigger_callback - Generic event_command @func implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * @cmd_ops: The command ops, used for trigger registration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * @glob: The raw string used to register the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * @cmd: The cmd portion of the string used to register the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) * @param: The params portion of the string used to register the trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) * Common implementation for event command parsing and trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * instantiation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * Usually used directly as the @func method in event command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) * Return: 0 on success, errno otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) event_trigger_callback(struct event_command *cmd_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) struct trace_event_file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) char *glob, char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) struct event_trigger_data *trigger_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) struct event_trigger_ops *trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) char *trigger = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) char *number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) /* separate the trigger from the filter (t:n [if filter]) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (param && isdigit(param[0])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) trigger = strsep(¶m, " \t");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (param) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) param = skip_spaces(param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (!*param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) param = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (!trigger_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) trigger_data->count = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) trigger_data->ops = trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) trigger_data->cmd_ops = cmd_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) trigger_data->private_data = file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) INIT_LIST_HEAD(&trigger_data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) INIT_LIST_HEAD(&trigger_data->named_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (glob[0] == '!') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) kfree(trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) if (trigger) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) number = strsep(&trigger, ":");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (!strlen(number))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * We use the callback data field (which is a pointer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * as our counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) ret = kstrtoul(number, 0, &trigger_data->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) if (!param) /* if param is non-empty, it's supposed to be a filter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) goto out_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) if (!cmd_ops->set_filter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) goto out_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) ret = cmd_ops->set_filter(param, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) out_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) /* Up the trigger_data count to make sure reg doesn't free it on failure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) event_trigger_init(trigger_ops, trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) * The above returns on success the # of functions enabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * but if it didn't find any functions it returns zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * Consider no functions a failure too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) cmd_ops->unreg(glob, trigger_ops, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) } else if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) /* Down the counter of trigger_data or free it if not used anymore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) event_trigger_free(trigger_ops, trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (cmd_ops->set_filter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) cmd_ops->set_filter(NULL, trigger_data, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) kfree(trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * set_trigger_filter - Generic event_command @set_filter implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) * @filter_str: The filter string for the trigger, NULL to remove filter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) * @trigger_data: Trigger-specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) * @file: The trace_event_file associated with the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) * Common implementation for event command filter parsing and filter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) * instantiation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) * Usually used directly as the @set_filter method in event command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) * implementations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * Also used to remove a filter (if filter_str = NULL).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) * Return: 0 on success, errno otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) int set_trigger_filter(char *filter_str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) struct event_trigger_data *trigger_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) struct event_trigger_data *data = trigger_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) struct event_filter *filter = NULL, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (!filter_str) /* clear the current filter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) goto assign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) s = strsep(&filter_str, " \t");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (!strlen(s) || strcmp(s, "if") != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) if (!filter_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) /* The filter is for the 'trigger' event, not the triggered event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) ret = create_event_filter(file->tr, file->event_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) filter_str, false, &filter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * If create_event_filter() fails, filter still needs to be freed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) * Which the calling code will do with data->filter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) assign:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) tmp = rcu_access_pointer(data->filter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) rcu_assign_pointer(data->filter, filter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) /* Make sure the call is done with the filter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) tracepoint_synchronize_unregister();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) free_event_filter(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) kfree(data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) data->filter_str = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) if (filter_str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) data->filter_str = kstrdup(filter_str, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (!data->filter_str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) free_event_filter(rcu_access_pointer(data->filter));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) data->filter = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) static LIST_HEAD(named_triggers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) * find_named_trigger - Find the common named trigger associated with @name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * @name: The name of the set of named triggers to find the common data for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) * Named triggers are sets of triggers that share a common set of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) * trigger data. The first named trigger registered with a given name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) * owns the common trigger data that the others subsequently
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) * registered with the same name will reference. This function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * returns the common trigger data associated with that first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * registered instance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * Return: the common trigger data for the given named trigger on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * success, NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) struct event_trigger_data *find_named_trigger(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) list_for_each_entry(data, &named_triggers, named_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (data->named_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (strcmp(data->name, name) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) * is_named_trigger - determine if a given trigger is a named trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) * @test: The trigger data to test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * Return: true if 'test' is a named trigger, false otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) bool is_named_trigger(struct event_trigger_data *test)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) list_for_each_entry(data, &named_triggers, named_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) if (test == data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) * save_named_trigger - save the trigger in the named trigger list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) * @name: The name of the named trigger set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * @data: The trigger data to save
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) * Return: 0 if successful, negative error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) int save_named_trigger(const char *name, struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) data->name = kstrdup(name, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) if (!data->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) list_add(&data->named_list, &named_triggers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) * del_named_trigger - delete a trigger from the named trigger list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) * @data: The trigger data to delete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) void del_named_trigger(struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) kfree(data->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) data->name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) list_del(&data->named_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) static void __pause_named_trigger(struct event_trigger_data *data, bool pause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) struct event_trigger_data *test;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) list_for_each_entry(test, &named_triggers, named_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) if (strcmp(test->name, data->name) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) if (pause) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) test->paused_tmp = test->paused;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) test->paused = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) test->paused = test->paused_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) * pause_named_trigger - Pause all named triggers with the same name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) * @data: The trigger data of a named trigger to pause
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) * Pauses a named trigger along with all other triggers having the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * same name. Because named triggers share a common set of data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) * pausing only one is meaningless, so pausing one named trigger needs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * to pause all triggers with the same name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) void pause_named_trigger(struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) __pause_named_trigger(data, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) * unpause_named_trigger - Un-pause all named triggers with the same name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) * @data: The trigger data of a named trigger to unpause
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) * Un-pauses a named trigger along with all other triggers having the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) * same name. Because named triggers share a common set of data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) * unpausing only one is meaningless, so unpausing one named trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) * needs to unpause all triggers with the same name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) void unpause_named_trigger(struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) __pause_named_trigger(data, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) * set_named_trigger_data - Associate common named trigger data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) * @data: The trigger data of a named trigger to unpause
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) * Named triggers are sets of triggers that share a common set of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) * trigger data. The first named trigger registered with a given name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) * owns the common trigger data that the others subsequently
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) * registered with the same name will reference. This function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) * associates the common trigger data from the first trigger with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) * given trigger.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) void set_named_trigger_data(struct event_trigger_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) struct event_trigger_data *named_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) data->named_data = named_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) struct event_trigger_data *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) get_named_trigger_data(struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) return data->named_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) traceon_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) struct trace_event_file *file = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) if (tracer_tracing_is_on(file->tr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) tracer_tracing_on(file->tr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (tracing_is_on())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) tracing_on();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) traceon_count_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) struct trace_event_file *file = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (tracer_tracing_is_on(file->tr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) if (tracing_is_on())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) if (!data->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) if (data->count != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) (data->count)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) if (file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) tracer_tracing_on(file->tr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) tracing_on();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) traceoff_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) struct trace_event_file *file = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) if (!tracer_tracing_is_on(file->tr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) tracer_tracing_off(file->tr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) if (!tracing_is_on())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) tracing_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) traceoff_count_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) struct trace_event_file *file = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) if (!tracer_tracing_is_on(file->tr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) if (!tracing_is_on())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (!data->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) if (data->count != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) (data->count)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) tracer_tracing_off(file->tr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) tracing_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) traceon_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) return event_trigger_print("traceon", m, (void *)data->count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) traceoff_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) return event_trigger_print("traceoff", m, (void *)data->count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) static struct event_trigger_ops traceon_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) .func = traceon_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) .print = traceon_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) static struct event_trigger_ops traceon_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) .func = traceon_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) .print = traceon_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) static struct event_trigger_ops traceoff_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) .func = traceoff_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) .print = traceoff_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) static struct event_trigger_ops traceoff_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) .func = traceoff_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) .print = traceoff_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) static struct event_trigger_ops *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) onoff_get_trigger_ops(char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) struct event_trigger_ops *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) /* we register both traceon and traceoff to this callback */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) if (strcmp(cmd, "traceon") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) ops = param ? &traceon_count_trigger_ops :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) &traceon_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) ops = param ? &traceoff_count_trigger_ops :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) &traceoff_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) return ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) static struct event_command trigger_traceon_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) .name = "traceon",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) .trigger_type = ETT_TRACE_ONOFF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) .func = event_trigger_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) .reg = register_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) .unreg = unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) .get_trigger_ops = onoff_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) static struct event_command trigger_traceoff_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) .name = "traceoff",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) .trigger_type = ETT_TRACE_ONOFF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) .flags = EVENT_CMD_FL_POST_TRIGGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) .func = event_trigger_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) .reg = register_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) .unreg = unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) .get_trigger_ops = onoff_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) #ifdef CONFIG_TRACER_SNAPSHOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) snapshot_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) struct trace_event_file *file = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) tracing_snapshot_instance(file->tr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) tracing_snapshot();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) snapshot_count_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) if (!data->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) if (data->count != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) (data->count)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) snapshot_trigger(data, rec, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) register_snapshot_trigger(char *glob, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) struct event_trigger_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (tracing_alloc_snapshot_instance(file->tr) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) return register_trigger(glob, ops, data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) snapshot_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) return event_trigger_print("snapshot", m, (void *)data->count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) static struct event_trigger_ops snapshot_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) .func = snapshot_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) .print = snapshot_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) static struct event_trigger_ops snapshot_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) .func = snapshot_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) .print = snapshot_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) static struct event_trigger_ops *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) snapshot_get_trigger_ops(char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) static struct event_command trigger_snapshot_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) .name = "snapshot",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) .trigger_type = ETT_SNAPSHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) .func = event_trigger_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) .reg = register_snapshot_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) .unreg = unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) .get_trigger_ops = snapshot_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) static __init int register_trigger_snapshot_cmd(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) ret = register_event_command(&trigger_snapshot_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) WARN_ON(ret < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) static __init int register_trigger_snapshot_cmd(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) #endif /* CONFIG_TRACER_SNAPSHOT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) #ifdef CONFIG_UNWINDER_ORC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) /* Skip 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) * event_triggers_post_call()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) * trace_event_raw_event_xxx()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) # define STACK_SKIP 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) * Skip 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) * stacktrace_trigger()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * event_triggers_post_call()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) * trace_event_buffer_commit()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) * trace_event_raw_event_xxx()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) #define STACK_SKIP 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) stacktrace_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) trace_dump_stack(STACK_SKIP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) stacktrace_count_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) if (!data->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) if (data->count != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) (data->count)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) stacktrace_trigger(data, rec, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return event_trigger_print("stacktrace", m, (void *)data->count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) static struct event_trigger_ops stacktrace_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) .func = stacktrace_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) .print = stacktrace_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) static struct event_trigger_ops stacktrace_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) .func = stacktrace_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) .print = stacktrace_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) .free = event_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) static struct event_trigger_ops *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) stacktrace_get_trigger_ops(char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) static struct event_command trigger_stacktrace_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) .name = "stacktrace",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) .trigger_type = ETT_STACKTRACE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) .flags = EVENT_CMD_FL_POST_TRIGGER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) .func = event_trigger_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) .reg = register_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) .unreg = unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) .get_trigger_ops = stacktrace_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) static __init int register_trigger_stacktrace_cmd(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) ret = register_event_command(&trigger_stacktrace_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) WARN_ON(ret < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) static __init int register_trigger_stacktrace_cmd(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) #endif /* CONFIG_STACKTRACE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) static __init void unregister_trigger_traceon_traceoff_cmds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) unregister_event_command(&trigger_traceon_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) unregister_event_command(&trigger_traceoff_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) event_enable_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) struct enable_trigger_data *enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) if (enable_data->enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) event_enable_count_trigger(struct event_trigger_data *data, void *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) struct ring_buffer_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) struct enable_trigger_data *enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) if (!data->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) /* Skip if the event is in a state we want to switch to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) if (enable_data->enable == !(enable_data->file->flags & EVENT_FILE_FL_SOFT_DISABLED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) if (data->count != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) (data->count)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) event_enable_trigger(data, rec, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) int event_enable_trigger_print(struct seq_file *m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) struct enable_trigger_data *enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) seq_printf(m, "%s:%s:%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) enable_data->hist ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) (enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) (enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) enable_data->file->event_call->class->system,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) trace_event_name(enable_data->file->event_call));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) if (data->count == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) seq_puts(m, ":unlimited");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) seq_printf(m, ":count=%ld", data->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) if (data->filter_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) seq_printf(m, " if %s\n", data->filter_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) void event_enable_trigger_free(struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) struct event_trigger_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) struct enable_trigger_data *enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) if (WARN_ON_ONCE(data->ref <= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) data->ref--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) if (!data->ref) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) /* Remove the SOFT_MODE flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) trace_event_enable_disable(enable_data->file, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) module_put(enable_data->file->event_call->mod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) trigger_data_free(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) kfree(enable_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) static struct event_trigger_ops event_enable_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) .func = event_enable_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) .print = event_enable_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) .free = event_enable_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) static struct event_trigger_ops event_enable_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) .func = event_enable_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) .print = event_enable_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) .free = event_enable_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) static struct event_trigger_ops event_disable_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) .func = event_enable_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) .print = event_enable_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) .free = event_enable_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) static struct event_trigger_ops event_disable_count_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) .func = event_enable_count_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) .print = event_enable_trigger_print,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) .init = event_trigger_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) .free = event_enable_trigger_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) int event_enable_trigger_func(struct event_command *cmd_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) struct trace_event_file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) char *glob, char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) struct trace_event_file *event_enable_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) struct enable_trigger_data *enable_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) struct event_trigger_data *trigger_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) struct event_trigger_ops *trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) struct trace_array *tr = file->tr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) const char *system;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) const char *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) bool hist = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) char *trigger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) char *number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) bool enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) if (!param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) /* separate the trigger from the filter (s:e:n [if filter]) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) trigger = strsep(¶m, " \t");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) if (!trigger)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) if (param) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) param = skip_spaces(param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) if (!*param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) param = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) system = strsep(&trigger, ":");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) if (!trigger)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) event = strsep(&trigger, ":");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) event_enable_file = find_event_file(tr, system, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) if (!event_enable_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) #ifdef CONFIG_HIST_TRIGGERS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) (strcmp(cmd, DISABLE_HIST_STR) == 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) (strcmp(cmd, ENABLE_HIST_STR) == 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) if (!trigger_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) if (!enable_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) kfree(trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) trigger_data->count = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) trigger_data->ops = trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) trigger_data->cmd_ops = cmd_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) INIT_LIST_HEAD(&trigger_data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) RCU_INIT_POINTER(trigger_data->filter, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) enable_data->hist = hist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) enable_data->enable = enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) enable_data->file = event_enable_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) trigger_data->private_data = enable_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) if (glob[0] == '!') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) kfree(trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) kfree(enable_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) /* Up the trigger_data count to make sure nothing frees it on failure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) event_trigger_init(trigger_ops, trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) if (trigger) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) number = strsep(&trigger, ":");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) if (!strlen(number))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) * We use the callback data field (which is a pointer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) * as our counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) ret = kstrtoul(number, 0, &trigger_data->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) if (!param) /* if param is non-empty, it's supposed to be a filter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) goto out_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) if (!cmd_ops->set_filter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) goto out_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) ret = cmd_ops->set_filter(param, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) out_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) /* Don't let event modules unload while probe registered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) ret = try_module_get(event_enable_file->event_call->mod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) ret = trace_event_enable_disable(event_enable_file, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) * The above returns on success the # of functions enabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) * but if it didn't find any functions it returns zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) * Consider no functions a failure too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) goto out_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) } else if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) goto out_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) /* Just return zero, not the number of enabled functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) event_trigger_free(trigger_ops, trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) out_disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) trace_event_enable_disable(event_enable_file, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) out_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) module_put(event_enable_file->event_call->mod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) if (cmd_ops->set_filter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) cmd_ops->set_filter(NULL, trigger_data, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) event_trigger_free(trigger_ops, trigger_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) kfree(enable_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) int event_enable_register_trigger(char *glob,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) struct event_trigger_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) struct enable_trigger_data *enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) struct enable_trigger_data *test_enable_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) struct event_trigger_data *test;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) lockdep_assert_held(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) list_for_each_entry(test, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) test_enable_data = test->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) if (test_enable_data &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) (test->cmd_ops->trigger_type ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) data->cmd_ops->trigger_type) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) (test_enable_data->file == enable_data->file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) if (data->ops->init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) ret = data->ops->init(data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) list_add_rcu(&data->list, &file->triggers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) ret++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) if (trace_event_trigger_enable_disable(file, 1) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) list_del_rcu(&data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) ret--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) void event_enable_unregister_trigger(char *glob,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) struct event_trigger_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) struct event_trigger_data *test,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) struct trace_event_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) struct enable_trigger_data *test_enable_data = test->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) struct enable_trigger_data *enable_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) struct event_trigger_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) bool unregistered = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) lockdep_assert_held(&event_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) list_for_each_entry(data, &file->triggers, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) enable_data = data->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) if (enable_data &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) (data->cmd_ops->trigger_type ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) test->cmd_ops->trigger_type) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) (enable_data->file == test_enable_data->file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) unregistered = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) list_del_rcu(&data->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) trace_event_trigger_enable_disable(file, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) update_cond_flag(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) if (unregistered && data->ops->free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) data->ops->free(data->ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) static struct event_trigger_ops *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) event_enable_get_trigger_ops(char *cmd, char *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) struct event_trigger_ops *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) bool enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) #ifdef CONFIG_HIST_TRIGGERS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) (strcmp(cmd, ENABLE_HIST_STR) == 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) if (enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) ops = param ? &event_enable_count_trigger_ops :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) &event_enable_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) ops = param ? &event_disable_count_trigger_ops :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) &event_disable_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) return ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) static struct event_command trigger_enable_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) .name = ENABLE_EVENT_STR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) .trigger_type = ETT_EVENT_ENABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) .func = event_enable_trigger_func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) .reg = event_enable_register_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) .unreg = event_enable_unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) .get_trigger_ops = event_enable_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) static struct event_command trigger_disable_cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) .name = DISABLE_EVENT_STR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) .trigger_type = ETT_EVENT_ENABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) .func = event_enable_trigger_func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) .reg = event_enable_register_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) .unreg = event_enable_unregister_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) .get_trigger_ops = event_enable_get_trigger_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) .set_filter = set_trigger_filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) static __init void unregister_trigger_enable_disable_cmds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) unregister_event_command(&trigger_enable_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) unregister_event_command(&trigger_disable_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) static __init int register_trigger_enable_disable_cmds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) ret = register_event_command(&trigger_enable_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) if (WARN_ON(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) ret = register_event_command(&trigger_disable_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) if (WARN_ON(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) unregister_trigger_enable_disable_cmds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) static __init int register_trigger_traceon_traceoff_cmds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) ret = register_event_command(&trigger_traceon_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) if (WARN_ON(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) ret = register_event_command(&trigger_traceoff_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) if (WARN_ON(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) unregister_trigger_traceon_traceoff_cmds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) __init int register_trigger_cmds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) register_trigger_traceon_traceoff_cmds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) register_trigger_snapshot_cmd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) register_trigger_stacktrace_cmd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) register_trigger_enable_disable_cmds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) register_trigger_hist_enable_disable_cmds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) register_trigger_hist_cmd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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