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bc82c38a69
On a powerpc32 build with CONFIG_CC_OPTIMISE_FOR_SIZE, the inline keyword is not honored and trace_trigger_soft_disabled() appears approx 50 times in vmlinux. Adding -Winline to the build, the following message appears: ./include/linux/trace_events.h:712:1: error: inlining failed in call to 'trace_trigger_soft_disabled': call is unlikely and code size would grow [-Werror=inline] That function is rather big for an inlined function: c003df60 <trace_trigger_soft_disabled>: c003df60: 94 21 ff f0 stwu r1,-16(r1) c003df64: 7c 08 02 a6 mflr r0 c003df68: 90 01 00 14 stw r0,20(r1) c003df6c: bf c1 00 08 stmw r30,8(r1) c003df70: 83 e3 00 24 lwz r31,36(r3) c003df74: 73 e9 01 00 andi. r9,r31,256 c003df78: 41 82 00 10 beq c003df88 <trace_trigger_soft_disabled+0x28> c003df7c: 38 60 00 00 li r3,0 c003df80: 39 61 00 10 addi r11,r1,16 c003df84: 4b fd 60 ac b c0014030 <_rest32gpr_30_x> c003df88: 73 e9 00 80 andi. r9,r31,128 c003df8c: 7c 7e 1b 78 mr r30,r3 c003df90: 41 a2 00 14 beq c003dfa4 <trace_trigger_soft_disabled+0x44> c003df94: 38 c0 00 00 li r6,0 c003df98: 38 a0 00 00 li r5,0 c003df9c: 38 80 00 00 li r4,0 c003dfa0: 48 05 c5 f1 bl c009a590 <event_triggers_call> c003dfa4: 73 e9 00 40 andi. r9,r31,64 c003dfa8: 40 82 00 28 bne c003dfd0 <trace_trigger_soft_disabled+0x70> c003dfac: 73 ff 02 00 andi. r31,r31,512 c003dfb0: 41 82 ff cc beq c003df7c <trace_trigger_soft_disabled+0x1c> c003dfb4: 80 01 00 14 lwz r0,20(r1) c003dfb8: 83 e1 00 0c lwz r31,12(r1) c003dfbc: 7f c3 f3 78 mr r3,r30 c003dfc0: 83 c1 00 08 lwz r30,8(r1) c003dfc4: 7c 08 03 a6 mtlr r0 c003dfc8: 38 21 00 10 addi r1,r1,16 c003dfcc: 48 05 6f 6c b c0094f38 <trace_event_ignore_this_pid> c003dfd0: 38 60 00 01 li r3,1 c003dfd4: 4b ff ff ac b c003df80 <trace_trigger_soft_disabled+0x20> However it is located in a hot path so inlining it is important. But forcing inlining of the entire function by using __always_inline leads to increasing the text size by approx 20 kbytes. Instead, split the fonction in two parts, one part with the likely fast path, flagged __always_inline, and a second part out of line. With this change, on a powerpc32 with CONFIG_CC_OPTIMISE_FOR_SIZE vmlinux text increases by only 1,4 kbytes, which is partly compensated by a decrease of vmlinux data by 7 kbytes. On ppc64_defconfig which has CONFIG_CC_OPTIMISE_FOR_SPEED, this change reduces vmlinux text by more than 30 kbytes. Link: https://lkml.kernel.org/r/69ce0986a52d026d381d612801d978aa4f977460.1644563295.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2090 lines
54 KiB
C
2090 lines
54 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* trace_events_trigger - trace event triggers
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*
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* Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com>
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*/
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#include <linux/security.h>
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/rculist.h>
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#include "trace.h"
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static LIST_HEAD(trigger_commands);
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static DEFINE_MUTEX(trigger_cmd_mutex);
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void trigger_data_free(struct event_trigger_data *data)
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{
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if (data->cmd_ops->set_filter)
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data->cmd_ops->set_filter(NULL, data, NULL);
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/* make sure current triggers exit before free */
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tracepoint_synchronize_unregister();
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kfree(data);
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}
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/**
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* event_triggers_call - Call triggers associated with a trace event
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* @file: The trace_event_file associated with the event
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* @rec: The trace entry for the event, NULL for unconditional invocation
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*
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* For each trigger associated with an event, invoke the trigger
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* function registered with the associated trigger command. If rec is
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* non-NULL, it means that the trigger requires further processing and
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* shouldn't be unconditionally invoked. If rec is non-NULL and the
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* trigger has a filter associated with it, rec will checked against
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* the filter and if the record matches the trigger will be invoked.
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* If the trigger is a 'post_trigger', meaning it shouldn't be invoked
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* in any case until the current event is written, the trigger
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* function isn't invoked but the bit associated with the deferred
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* trigger is set in the return value.
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*
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* Returns an enum event_trigger_type value containing a set bit for
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* any trigger that should be deferred, ETT_NONE if nothing to defer.
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*
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* Called from tracepoint handlers (with rcu_read_lock_sched() held).
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*
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* Return: an enum event_trigger_type value containing a set bit for
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* any trigger that should be deferred, ETT_NONE if nothing to defer.
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*/
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enum event_trigger_type
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event_triggers_call(struct trace_event_file *file,
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struct trace_buffer *buffer, void *rec,
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struct ring_buffer_event *event)
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{
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struct event_trigger_data *data;
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enum event_trigger_type tt = ETT_NONE;
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struct event_filter *filter;
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if (list_empty(&file->triggers))
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return tt;
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list_for_each_entry_rcu(data, &file->triggers, list) {
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if (data->paused)
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continue;
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if (!rec) {
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data->ops->trigger(data, buffer, rec, event);
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continue;
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}
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filter = rcu_dereference_sched(data->filter);
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if (filter && !filter_match_preds(filter, rec))
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continue;
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if (event_command_post_trigger(data->cmd_ops)) {
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tt |= data->cmd_ops->trigger_type;
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continue;
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}
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data->ops->trigger(data, buffer, rec, event);
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}
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return tt;
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}
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EXPORT_SYMBOL_GPL(event_triggers_call);
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bool __trace_trigger_soft_disabled(struct trace_event_file *file)
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{
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unsigned long eflags = file->flags;
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if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
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event_triggers_call(file, NULL, NULL, NULL);
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if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
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return true;
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if (eflags & EVENT_FILE_FL_PID_FILTER)
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return trace_event_ignore_this_pid(file);
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return false;
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}
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EXPORT_SYMBOL_GPL(__trace_trigger_soft_disabled);
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/**
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* event_triggers_post_call - Call 'post_triggers' for a trace event
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* @file: The trace_event_file associated with the event
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* @tt: enum event_trigger_type containing a set bit for each trigger to invoke
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*
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* For each trigger associated with an event, invoke the trigger
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* function registered with the associated trigger command, if the
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* corresponding bit is set in the tt enum passed into this function.
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* See @event_triggers_call for details on how those bits are set.
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*
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* Called from tracepoint handlers (with rcu_read_lock_sched() held).
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*/
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void
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event_triggers_post_call(struct trace_event_file *file,
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enum event_trigger_type tt)
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{
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struct event_trigger_data *data;
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list_for_each_entry_rcu(data, &file->triggers, list) {
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if (data->paused)
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continue;
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if (data->cmd_ops->trigger_type & tt)
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data->ops->trigger(data, NULL, NULL, NULL);
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}
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}
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EXPORT_SYMBOL_GPL(event_triggers_post_call);
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#define SHOW_AVAILABLE_TRIGGERS (void *)(1UL)
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static void *trigger_next(struct seq_file *m, void *t, loff_t *pos)
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{
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struct trace_event_file *event_file = event_file_data(m->private);
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if (t == SHOW_AVAILABLE_TRIGGERS) {
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(*pos)++;
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return NULL;
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}
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return seq_list_next(t, &event_file->triggers, pos);
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}
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static bool check_user_trigger(struct trace_event_file *file)
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{
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struct event_trigger_data *data;
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list_for_each_entry_rcu(data, &file->triggers, list) {
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if (data->flags & EVENT_TRIGGER_FL_PROBE)
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continue;
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return true;
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}
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return false;
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}
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static void *trigger_start(struct seq_file *m, loff_t *pos)
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{
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struct trace_event_file *event_file;
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/* ->stop() is called even if ->start() fails */
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mutex_lock(&event_mutex);
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event_file = event_file_data(m->private);
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if (unlikely(!event_file))
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return ERR_PTR(-ENODEV);
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if (list_empty(&event_file->triggers) || !check_user_trigger(event_file))
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return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL;
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return seq_list_start(&event_file->triggers, *pos);
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}
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static void trigger_stop(struct seq_file *m, void *t)
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{
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mutex_unlock(&event_mutex);
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}
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static int trigger_show(struct seq_file *m, void *v)
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{
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struct event_trigger_data *data;
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struct event_command *p;
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if (v == SHOW_AVAILABLE_TRIGGERS) {
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seq_puts(m, "# Available triggers:\n");
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seq_putc(m, '#');
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mutex_lock(&trigger_cmd_mutex);
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list_for_each_entry_reverse(p, &trigger_commands, list)
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seq_printf(m, " %s", p->name);
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seq_putc(m, '\n');
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mutex_unlock(&trigger_cmd_mutex);
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return 0;
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}
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data = list_entry(v, struct event_trigger_data, list);
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data->ops->print(m, data->ops, data);
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return 0;
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}
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static const struct seq_operations event_triggers_seq_ops = {
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.start = trigger_start,
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.next = trigger_next,
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.stop = trigger_stop,
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.show = trigger_show,
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};
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static int event_trigger_regex_open(struct inode *inode, struct file *file)
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{
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int ret;
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ret = security_locked_down(LOCKDOWN_TRACEFS);
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if (ret)
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return ret;
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mutex_lock(&event_mutex);
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if (unlikely(!event_file_data(file))) {
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mutex_unlock(&event_mutex);
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return -ENODEV;
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}
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if ((file->f_mode & FMODE_WRITE) &&
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(file->f_flags & O_TRUNC)) {
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struct trace_event_file *event_file;
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struct event_command *p;
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event_file = event_file_data(file);
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list_for_each_entry(p, &trigger_commands, list) {
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if (p->unreg_all)
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p->unreg_all(event_file);
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}
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}
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if (file->f_mode & FMODE_READ) {
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ret = seq_open(file, &event_triggers_seq_ops);
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if (!ret) {
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struct seq_file *m = file->private_data;
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m->private = file;
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}
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}
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mutex_unlock(&event_mutex);
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return ret;
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}
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int trigger_process_regex(struct trace_event_file *file, char *buff)
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{
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char *command, *next;
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struct event_command *p;
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int ret = -EINVAL;
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next = buff = skip_spaces(buff);
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command = strsep(&next, ": \t");
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if (next) {
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next = skip_spaces(next);
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if (!*next)
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next = NULL;
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}
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command = (command[0] != '!') ? command : command + 1;
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mutex_lock(&trigger_cmd_mutex);
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list_for_each_entry(p, &trigger_commands, list) {
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if (strcmp(p->name, command) == 0) {
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ret = p->parse(p, file, buff, command, next);
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goto out_unlock;
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}
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}
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out_unlock:
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mutex_unlock(&trigger_cmd_mutex);
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return ret;
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}
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static ssize_t event_trigger_regex_write(struct file *file,
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const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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struct trace_event_file *event_file;
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ssize_t ret;
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char *buf;
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if (!cnt)
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return 0;
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if (cnt >= PAGE_SIZE)
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return -EINVAL;
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buf = memdup_user_nul(ubuf, cnt);
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if (IS_ERR(buf))
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return PTR_ERR(buf);
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strim(buf);
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mutex_lock(&event_mutex);
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event_file = event_file_data(file);
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if (unlikely(!event_file)) {
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mutex_unlock(&event_mutex);
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kfree(buf);
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return -ENODEV;
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}
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ret = trigger_process_regex(event_file, buf);
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mutex_unlock(&event_mutex);
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kfree(buf);
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if (ret < 0)
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goto out;
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*ppos += cnt;
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ret = cnt;
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out:
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return ret;
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}
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static int event_trigger_regex_release(struct inode *inode, struct file *file)
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{
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mutex_lock(&event_mutex);
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if (file->f_mode & FMODE_READ)
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seq_release(inode, file);
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mutex_unlock(&event_mutex);
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return 0;
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}
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static ssize_t
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event_trigger_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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return event_trigger_regex_write(filp, ubuf, cnt, ppos);
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}
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static int
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event_trigger_open(struct inode *inode, struct file *filp)
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{
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/* Checks for tracefs lockdown */
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return event_trigger_regex_open(inode, filp);
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}
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static int
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event_trigger_release(struct inode *inode, struct file *file)
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{
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return event_trigger_regex_release(inode, file);
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}
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const struct file_operations event_trigger_fops = {
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.open = event_trigger_open,
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.read = seq_read,
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.write = event_trigger_write,
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.llseek = tracing_lseek,
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.release = event_trigger_release,
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};
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/*
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* Currently we only register event commands from __init, so mark this
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* __init too.
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*/
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__init int register_event_command(struct event_command *cmd)
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{
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struct event_command *p;
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int ret = 0;
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mutex_lock(&trigger_cmd_mutex);
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list_for_each_entry(p, &trigger_commands, list) {
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if (strcmp(cmd->name, p->name) == 0) {
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ret = -EBUSY;
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goto out_unlock;
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}
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}
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list_add(&cmd->list, &trigger_commands);
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out_unlock:
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mutex_unlock(&trigger_cmd_mutex);
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return ret;
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}
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/*
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* Currently we only unregister event commands from __init, so mark
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* this __init too.
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*/
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__init int unregister_event_command(struct event_command *cmd)
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{
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struct event_command *p, *n;
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int ret = -ENODEV;
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mutex_lock(&trigger_cmd_mutex);
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list_for_each_entry_safe(p, n, &trigger_commands, list) {
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if (strcmp(cmd->name, p->name) == 0) {
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ret = 0;
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list_del_init(&p->list);
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goto out_unlock;
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}
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}
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out_unlock:
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mutex_unlock(&trigger_cmd_mutex);
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return ret;
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}
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/**
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* event_trigger_print - Generic event_trigger_ops @print implementation
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* @name: The name of the event trigger
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* @m: The seq_file being printed to
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* @data: Trigger-specific data
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* @filter_str: filter_str to print, if present
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*
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* Common implementation for event triggers to print themselves.
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*
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* Usually wrapped by a function that simply sets the @name of the
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* trigger command and then invokes this.
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*
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* Return: 0 on success, errno otherwise
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*/
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static int
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event_trigger_print(const char *name, struct seq_file *m,
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void *data, char *filter_str)
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{
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long count = (long)data;
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seq_puts(m, name);
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if (count == -1)
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seq_puts(m, ":unlimited");
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else
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seq_printf(m, ":count=%ld", count);
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if (filter_str)
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seq_printf(m, " if %s\n", filter_str);
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else
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seq_putc(m, '\n');
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return 0;
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}
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/**
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* event_trigger_init - Generic event_trigger_ops @init implementation
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* @ops: The trigger ops associated with the trigger
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* @data: Trigger-specific data
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*
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* Common implementation of event trigger initialization.
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*
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* Usually used directly as the @init method in event trigger
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* implementations.
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*
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* Return: 0 on success, errno otherwise
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*/
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int event_trigger_init(struct event_trigger_ops *ops,
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struct event_trigger_data *data)
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{
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data->ref++;
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return 0;
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}
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/**
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* event_trigger_free - Generic event_trigger_ops @free implementation
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* @ops: The trigger ops associated with the trigger
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* @data: Trigger-specific data
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*
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* Common implementation of event trigger de-initialization.
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*
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* Usually used directly as the @free method in event trigger
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* implementations.
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*/
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static void
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event_trigger_free(struct event_trigger_ops *ops,
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struct event_trigger_data *data)
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{
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if (WARN_ON_ONCE(data->ref <= 0))
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return;
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data->ref--;
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if (!data->ref)
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trigger_data_free(data);
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}
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int trace_event_trigger_enable_disable(struct trace_event_file *file,
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int trigger_enable)
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{
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int ret = 0;
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if (trigger_enable) {
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if (atomic_inc_return(&file->tm_ref) > 1)
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|
return ret;
|
|
set_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags);
|
|
ret = trace_event_enable_disable(file, 1, 1);
|
|
} else {
|
|
if (atomic_dec_return(&file->tm_ref) > 0)
|
|
return ret;
|
|
clear_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags);
|
|
ret = trace_event_enable_disable(file, 0, 1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* clear_event_triggers - Clear all triggers associated with a trace array
|
|
* @tr: The trace array to clear
|
|
*
|
|
* For each trigger, the triggering event has its tm_ref decremented
|
|
* via trace_event_trigger_enable_disable(), and any associated event
|
|
* (in the case of enable/disable_event triggers) will have its sm_ref
|
|
* decremented via free()->trace_event_enable_disable(). That
|
|
* combination effectively reverses the soft-mode/trigger state added
|
|
* by trigger registration.
|
|
*
|
|
* Must be called with event_mutex held.
|
|
*/
|
|
void
|
|
clear_event_triggers(struct trace_array *tr)
|
|
{
|
|
struct trace_event_file *file;
|
|
|
|
list_for_each_entry(file, &tr->events, list) {
|
|
struct event_trigger_data *data, *n;
|
|
list_for_each_entry_safe(data, n, &file->triggers, list) {
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
list_del_rcu(&data->list);
|
|
if (data->ops->free)
|
|
data->ops->free(data->ops, data);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* update_cond_flag - Set or reset the TRIGGER_COND bit
|
|
* @file: The trace_event_file associated with the event
|
|
*
|
|
* If an event has triggers and any of those triggers has a filter or
|
|
* a post_trigger, trigger invocation needs to be deferred until after
|
|
* the current event has logged its data, and the event should have
|
|
* its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
|
|
* cleared.
|
|
*/
|
|
void update_cond_flag(struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *data;
|
|
bool set_cond = false;
|
|
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
list_for_each_entry(data, &file->triggers, list) {
|
|
if (data->filter || event_command_post_trigger(data->cmd_ops) ||
|
|
event_command_needs_rec(data->cmd_ops)) {
|
|
set_cond = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (set_cond)
|
|
set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
|
|
else
|
|
clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
|
|
}
|
|
|
|
/**
|
|
* register_trigger - Generic event_command @reg implementation
|
|
* @glob: The raw string used to register the trigger
|
|
* @data: Trigger-specific data to associate with the trigger
|
|
* @file: The trace_event_file associated with the event
|
|
*
|
|
* Common implementation for event trigger registration.
|
|
*
|
|
* Usually used directly as the @reg method in event command
|
|
* implementations.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
static int register_trigger(char *glob,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *test;
|
|
int ret = 0;
|
|
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
list_for_each_entry(test, &file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (data->ops->init) {
|
|
ret = data->ops->init(data->ops, data);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_add_rcu(&data->list, &file->triggers);
|
|
ret++;
|
|
|
|
update_cond_flag(file);
|
|
if (trace_event_trigger_enable_disable(file, 1) < 0) {
|
|
list_del_rcu(&data->list);
|
|
update_cond_flag(file);
|
|
ret--;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* unregister_trigger - Generic event_command @unreg implementation
|
|
* @glob: The raw string used to register the trigger
|
|
* @test: Trigger-specific data used to find the trigger to remove
|
|
* @file: The trace_event_file associated with the event
|
|
*
|
|
* Common implementation for event trigger unregistration.
|
|
*
|
|
* Usually used directly as the @unreg method in event command
|
|
* implementations.
|
|
*/
|
|
static void unregister_trigger(char *glob,
|
|
struct event_trigger_data *test,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *data;
|
|
bool unregistered = false;
|
|
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
list_for_each_entry(data, &file->triggers, list) {
|
|
if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
|
|
unregistered = true;
|
|
list_del_rcu(&data->list);
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
update_cond_flag(file);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (unregistered && data->ops->free)
|
|
data->ops->free(data->ops, data);
|
|
}
|
|
|
|
/*
|
|
* Event trigger parsing helper functions.
|
|
*
|
|
* These functions help make it easier to write an event trigger
|
|
* parsing function i.e. the struct event_command.parse() callback
|
|
* function responsible for parsing and registering a trigger command
|
|
* written to the 'trigger' file.
|
|
*
|
|
* A trigger command (or just 'trigger' for short) takes the form:
|
|
* [trigger] [if filter]
|
|
*
|
|
* The struct event_command.parse() callback (and other struct
|
|
* event_command functions) refer to several components of a trigger
|
|
* command. Those same components are referenced by the event trigger
|
|
* parsing helper functions defined below. These components are:
|
|
*
|
|
* cmd - the trigger command name
|
|
* glob - the trigger command name optionally prefaced with '!'
|
|
* param_and_filter - text following cmd and ':'
|
|
* param - text following cmd and ':' and stripped of filter
|
|
* filter - the optional filter text following (and including) 'if'
|
|
*
|
|
* To illustrate the use of these componenents, here are some concrete
|
|
* examples. For the following triggers:
|
|
*
|
|
* echo 'traceon:5 if pid == 0' > trigger
|
|
* - 'traceon' is both cmd and glob
|
|
* - '5 if pid == 0' is the param_and_filter
|
|
* - '5' is the param
|
|
* - 'if pid == 0' is the filter
|
|
*
|
|
* echo 'enable_event:sys:event:n' > trigger
|
|
* - 'enable_event' is both cmd and glob
|
|
* - 'sys:event:n' is the param_and_filter
|
|
* - 'sys:event:n' is the param
|
|
* - there is no filter
|
|
*
|
|
* echo 'hist:keys=pid if prio > 50' > trigger
|
|
* - 'hist' is both cmd and glob
|
|
* - 'keys=pid if prio > 50' is the param_and_filter
|
|
* - 'keys=pid' is the param
|
|
* - 'if prio > 50' is the filter
|
|
*
|
|
* echo '!enable_event:sys:event:n' > trigger
|
|
* - 'enable_event' the cmd
|
|
* - '!enable_event' is the glob
|
|
* - 'sys:event:n' is the param_and_filter
|
|
* - 'sys:event:n' is the param
|
|
* - there is no filter
|
|
*
|
|
* echo 'traceoff' > trigger
|
|
* - 'traceoff' is both cmd and glob
|
|
* - there is no param_and_filter
|
|
* - there is no param
|
|
* - there is no filter
|
|
*
|
|
* There are a few different categories of event trigger covered by
|
|
* these helpers:
|
|
*
|
|
* - triggers that don't require a parameter e.g. traceon
|
|
* - triggers that do require a parameter e.g. enable_event and hist
|
|
* - triggers that though they may not require a param may support an
|
|
* optional 'n' param (n = number of times the trigger should fire)
|
|
* e.g.: traceon:5 or enable_event:sys:event:n
|
|
* - triggers that do not support an 'n' param e.g. hist
|
|
*
|
|
* These functions can be used or ignored as necessary - it all
|
|
* depends on the complexity of the trigger, and the granularity of
|
|
* the functions supported reflects the fact that some implementations
|
|
* may need to customize certain aspects of their implementations and
|
|
* won't need certain functions. For instance, the hist trigger
|
|
* implementation doesn't use event_trigger_separate_filter() because
|
|
* it has special requirements for handling the filter.
|
|
*/
|
|
|
|
/**
|
|
* event_trigger_check_remove - check whether an event trigger specifies remove
|
|
* @glob: The trigger command string, with optional remove(!) operator
|
|
*
|
|
* The event trigger callback implementations pass in 'glob' as a
|
|
* parameter. This is the command name either with or without a
|
|
* remove(!) operator. This function simply parses the glob and
|
|
* determines whether the command corresponds to a trigger removal or
|
|
* a trigger addition.
|
|
*
|
|
* Return: true if this is a remove command, false otherwise
|
|
*/
|
|
bool event_trigger_check_remove(const char *glob)
|
|
{
|
|
return (glob && glob[0] == '!') ? true : false;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_empty_param - check whether the param is empty
|
|
* @param: The trigger param string
|
|
*
|
|
* The event trigger callback implementations pass in 'param' as a
|
|
* parameter. This corresponds to the string following the command
|
|
* name minus the command name. This function can be called by a
|
|
* callback implementation for any command that requires a param; a
|
|
* callback that doesn't require a param can ignore it.
|
|
*
|
|
* Return: true if this is an empty param, false otherwise
|
|
*/
|
|
bool event_trigger_empty_param(const char *param)
|
|
{
|
|
return !param;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_separate_filter - separate an event trigger from a filter
|
|
* @param: The param string containing trigger and possibly filter
|
|
* @trigger: outparam, will be filled with a pointer to the trigger
|
|
* @filter: outparam, will be filled with a pointer to the filter
|
|
* @param_required: Specifies whether or not the param string is required
|
|
*
|
|
* Given a param string of the form '[trigger] [if filter]', this
|
|
* function separates the filter from the trigger and returns the
|
|
* trigger in *trigger and the filter in *filter. Either the *trigger
|
|
* or the *filter may be set to NULL by this function - if not set to
|
|
* NULL, they will contain strings corresponding to the trigger and
|
|
* filter.
|
|
*
|
|
* There are two cases that need to be handled with respect to the
|
|
* passed-in param: either the param is required, or it is not
|
|
* required. If @param_required is set, and there's no param, it will
|
|
* return -EINVAL. If @param_required is not set and there's a param
|
|
* that starts with a number, that corresponds to the case of a
|
|
* trigger with :n (n = number of times the trigger should fire) and
|
|
* the parsing continues normally; otherwise the function just returns
|
|
* and assumes param just contains a filter and there's nothing else
|
|
* to do.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
int event_trigger_separate_filter(char *param_and_filter, char **param,
|
|
char **filter, bool param_required)
|
|
{
|
|
int ret = 0;
|
|
|
|
*param = *filter = NULL;
|
|
|
|
if (!param_and_filter) {
|
|
if (param_required)
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Here we check for an optional param. The only legal
|
|
* optional param is :n, and if that's the case, continue
|
|
* below. Otherwise we assume what's left is a filter and
|
|
* return it as the filter string for the caller to deal with.
|
|
*/
|
|
if (!param_required && param_and_filter && !isdigit(param_and_filter[0])) {
|
|
*filter = param_and_filter;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Separate the param from the filter (param [if filter]).
|
|
* Here we have either an optional :n param or a required
|
|
* param and an optional filter.
|
|
*/
|
|
*param = strsep(¶m_and_filter, " \t");
|
|
|
|
/*
|
|
* Here we have a filter, though it may be empty.
|
|
*/
|
|
if (param_and_filter) {
|
|
*filter = skip_spaces(param_and_filter);
|
|
if (!**filter)
|
|
*filter = NULL;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_alloc - allocate and init event_trigger_data for a trigger
|
|
* @cmd_ops: The event_command operations for the trigger
|
|
* @cmd: The cmd string
|
|
* @param: The param string
|
|
* @private_data: User data to associate with the event trigger
|
|
*
|
|
* Allocate an event_trigger_data instance and initialize it. The
|
|
* @cmd_ops are used along with the @cmd and @param to get the
|
|
* trigger_ops to assign to the event_trigger_data. @private_data can
|
|
* also be passed in and associated with the event_trigger_data.
|
|
*
|
|
* Use event_trigger_free() to free an event_trigger_data object.
|
|
*
|
|
* Return: The trigger_data object success, NULL otherwise
|
|
*/
|
|
struct event_trigger_data *event_trigger_alloc(struct event_command *cmd_ops,
|
|
char *cmd,
|
|
char *param,
|
|
void *private_data)
|
|
{
|
|
struct event_trigger_data *trigger_data;
|
|
struct event_trigger_ops *trigger_ops;
|
|
|
|
trigger_ops = cmd_ops->get_trigger_ops(cmd, param);
|
|
|
|
trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
|
|
if (!trigger_data)
|
|
return NULL;
|
|
|
|
trigger_data->count = -1;
|
|
trigger_data->ops = trigger_ops;
|
|
trigger_data->cmd_ops = cmd_ops;
|
|
trigger_data->private_data = private_data;
|
|
|
|
INIT_LIST_HEAD(&trigger_data->list);
|
|
INIT_LIST_HEAD(&trigger_data->named_list);
|
|
RCU_INIT_POINTER(trigger_data->filter, NULL);
|
|
|
|
return trigger_data;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_parse_num - parse and return the number param for a trigger
|
|
* @param: The param string
|
|
* @trigger_data: The trigger_data for the trigger
|
|
*
|
|
* Parse the :n (n = number of times the trigger should fire) param
|
|
* and set the count variable in the trigger_data to the parsed count.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
int event_trigger_parse_num(char *param,
|
|
struct event_trigger_data *trigger_data)
|
|
{
|
|
char *number;
|
|
int ret = 0;
|
|
|
|
if (param) {
|
|
number = strsep(¶m, ":");
|
|
|
|
if (!strlen(number))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* We use the callback data field (which is a pointer)
|
|
* as our counter.
|
|
*/
|
|
ret = kstrtoul(number, 0, &trigger_data->count);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_set_filter - set an event trigger's filter
|
|
* @cmd_ops: The event_command operations for the trigger
|
|
* @file: The event file for the trigger's event
|
|
* @param: The string containing the filter
|
|
* @trigger_data: The trigger_data for the trigger
|
|
*
|
|
* Set the filter for the trigger. If the filter is NULL, just return
|
|
* without error.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
int event_trigger_set_filter(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *param,
|
|
struct event_trigger_data *trigger_data)
|
|
{
|
|
if (param && cmd_ops->set_filter)
|
|
return cmd_ops->set_filter(param, trigger_data, file);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_reset_filter - reset an event trigger's filter
|
|
* @cmd_ops: The event_command operations for the trigger
|
|
* @trigger_data: The trigger_data for the trigger
|
|
*
|
|
* Reset the filter for the trigger to no filter.
|
|
*/
|
|
void event_trigger_reset_filter(struct event_command *cmd_ops,
|
|
struct event_trigger_data *trigger_data)
|
|
{
|
|
if (cmd_ops->set_filter)
|
|
cmd_ops->set_filter(NULL, trigger_data, NULL);
|
|
}
|
|
|
|
/**
|
|
* event_trigger_register - register an event trigger
|
|
* @cmd_ops: The event_command operations for the trigger
|
|
* @file: The event file for the trigger's event
|
|
* @glob: The trigger command string, with optional remove(!) operator
|
|
* @cmd: The cmd string
|
|
* @param: The param string
|
|
* @trigger_data: The trigger_data for the trigger
|
|
* @n_registered: optional outparam, the number of triggers registered
|
|
*
|
|
* Register an event trigger. The @cmd_ops are used to call the
|
|
* cmd_ops->reg() function which actually does the registration. The
|
|
* cmd_ops->reg() function returns the number of triggers registered,
|
|
* which is assigned to n_registered, if n_registered is non-NULL.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
int event_trigger_register(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob,
|
|
char *cmd,
|
|
char *param,
|
|
struct event_trigger_data *trigger_data,
|
|
int *n_registered)
|
|
{
|
|
int ret;
|
|
|
|
if (n_registered)
|
|
*n_registered = 0;
|
|
|
|
ret = cmd_ops->reg(glob, trigger_data, file);
|
|
/*
|
|
* The above returns on success the # of functions enabled,
|
|
* but if it didn't find any functions it returns zero.
|
|
* Consider no functions a failure too.
|
|
*/
|
|
if (!ret) {
|
|
cmd_ops->unreg(glob, trigger_data, file);
|
|
ret = -ENOENT;
|
|
} else if (ret > 0) {
|
|
if (n_registered)
|
|
*n_registered = ret;
|
|
/* Just return zero, not the number of enabled functions */
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* End event trigger parsing helper functions.
|
|
*/
|
|
|
|
/**
|
|
* event_trigger_parse - Generic event_command @parse implementation
|
|
* @cmd_ops: The command ops, used for trigger registration
|
|
* @file: The trace_event_file associated with the event
|
|
* @glob: The raw string used to register the trigger
|
|
* @cmd: The cmd portion of the string used to register the trigger
|
|
* @param: The params portion of the string used to register the trigger
|
|
*
|
|
* Common implementation for event command parsing and trigger
|
|
* instantiation.
|
|
*
|
|
* Usually used directly as the @parse method in event command
|
|
* implementations.
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
static int
|
|
event_trigger_parse(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob, char *cmd, char *param)
|
|
{
|
|
struct event_trigger_data *trigger_data;
|
|
struct event_trigger_ops *trigger_ops;
|
|
char *trigger = NULL;
|
|
char *number;
|
|
int ret;
|
|
|
|
/* separate the trigger from the filter (t:n [if filter]) */
|
|
if (param && isdigit(param[0])) {
|
|
trigger = strsep(¶m, " \t");
|
|
if (param) {
|
|
param = skip_spaces(param);
|
|
if (!*param)
|
|
param = NULL;
|
|
}
|
|
}
|
|
|
|
trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
|
|
|
|
ret = -ENOMEM;
|
|
trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
|
|
if (!trigger_data)
|
|
goto out;
|
|
|
|
trigger_data->count = -1;
|
|
trigger_data->ops = trigger_ops;
|
|
trigger_data->cmd_ops = cmd_ops;
|
|
trigger_data->private_data = file;
|
|
INIT_LIST_HEAD(&trigger_data->list);
|
|
INIT_LIST_HEAD(&trigger_data->named_list);
|
|
|
|
if (glob[0] == '!') {
|
|
cmd_ops->unreg(glob+1, trigger_data, file);
|
|
kfree(trigger_data);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (trigger) {
|
|
number = strsep(&trigger, ":");
|
|
|
|
ret = -EINVAL;
|
|
if (!strlen(number))
|
|
goto out_free;
|
|
|
|
/*
|
|
* We use the callback data field (which is a pointer)
|
|
* as our counter.
|
|
*/
|
|
ret = kstrtoul(number, 0, &trigger_data->count);
|
|
if (ret)
|
|
goto out_free;
|
|
}
|
|
|
|
if (!param) /* if param is non-empty, it's supposed to be a filter */
|
|
goto out_reg;
|
|
|
|
if (!cmd_ops->set_filter)
|
|
goto out_reg;
|
|
|
|
ret = cmd_ops->set_filter(param, trigger_data, file);
|
|
if (ret < 0)
|
|
goto out_free;
|
|
|
|
out_reg:
|
|
/* Up the trigger_data count to make sure reg doesn't free it on failure */
|
|
event_trigger_init(trigger_ops, trigger_data);
|
|
ret = cmd_ops->reg(glob, trigger_data, file);
|
|
/*
|
|
* The above returns on success the # of functions enabled,
|
|
* but if it didn't find any functions it returns zero.
|
|
* Consider no functions a failure too.
|
|
*/
|
|
if (!ret) {
|
|
cmd_ops->unreg(glob, trigger_data, file);
|
|
ret = -ENOENT;
|
|
} else if (ret > 0)
|
|
ret = 0;
|
|
|
|
/* Down the counter of trigger_data or free it if not used anymore */
|
|
event_trigger_free(trigger_ops, trigger_data);
|
|
out:
|
|
return ret;
|
|
|
|
out_free:
|
|
if (cmd_ops->set_filter)
|
|
cmd_ops->set_filter(NULL, trigger_data, NULL);
|
|
kfree(trigger_data);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* set_trigger_filter - Generic event_command @set_filter implementation
|
|
* @filter_str: The filter string for the trigger, NULL to remove filter
|
|
* @trigger_data: Trigger-specific data
|
|
* @file: The trace_event_file associated with the event
|
|
*
|
|
* Common implementation for event command filter parsing and filter
|
|
* instantiation.
|
|
*
|
|
* Usually used directly as the @set_filter method in event command
|
|
* implementations.
|
|
*
|
|
* Also used to remove a filter (if filter_str = NULL).
|
|
*
|
|
* Return: 0 on success, errno otherwise
|
|
*/
|
|
int set_trigger_filter(char *filter_str,
|
|
struct event_trigger_data *trigger_data,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *data = trigger_data;
|
|
struct event_filter *filter = NULL, *tmp;
|
|
int ret = -EINVAL;
|
|
char *s;
|
|
|
|
if (!filter_str) /* clear the current filter */
|
|
goto assign;
|
|
|
|
s = strsep(&filter_str, " \t");
|
|
|
|
if (!strlen(s) || strcmp(s, "if") != 0)
|
|
goto out;
|
|
|
|
if (!filter_str)
|
|
goto out;
|
|
|
|
/* The filter is for the 'trigger' event, not the triggered event */
|
|
ret = create_event_filter(file->tr, file->event_call,
|
|
filter_str, false, &filter);
|
|
/*
|
|
* If create_event_filter() fails, filter still needs to be freed.
|
|
* Which the calling code will do with data->filter.
|
|
*/
|
|
assign:
|
|
tmp = rcu_access_pointer(data->filter);
|
|
|
|
rcu_assign_pointer(data->filter, filter);
|
|
|
|
if (tmp) {
|
|
/* Make sure the call is done with the filter */
|
|
tracepoint_synchronize_unregister();
|
|
free_event_filter(tmp);
|
|
}
|
|
|
|
kfree(data->filter_str);
|
|
data->filter_str = NULL;
|
|
|
|
if (filter_str) {
|
|
data->filter_str = kstrdup(filter_str, GFP_KERNEL);
|
|
if (!data->filter_str) {
|
|
free_event_filter(rcu_access_pointer(data->filter));
|
|
data->filter = NULL;
|
|
ret = -ENOMEM;
|
|
}
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static LIST_HEAD(named_triggers);
|
|
|
|
/**
|
|
* find_named_trigger - Find the common named trigger associated with @name
|
|
* @name: The name of the set of named triggers to find the common data for
|
|
*
|
|
* Named triggers are sets of triggers that share a common set of
|
|
* trigger data. The first named trigger registered with a given name
|
|
* owns the common trigger data that the others subsequently
|
|
* registered with the same name will reference. This function
|
|
* returns the common trigger data associated with that first
|
|
* registered instance.
|
|
*
|
|
* Return: the common trigger data for the given named trigger on
|
|
* success, NULL otherwise.
|
|
*/
|
|
struct event_trigger_data *find_named_trigger(const char *name)
|
|
{
|
|
struct event_trigger_data *data;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
list_for_each_entry(data, &named_triggers, named_list) {
|
|
if (data->named_data)
|
|
continue;
|
|
if (strcmp(data->name, name) == 0)
|
|
return data;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* is_named_trigger - determine if a given trigger is a named trigger
|
|
* @test: The trigger data to test
|
|
*
|
|
* Return: true if 'test' is a named trigger, false otherwise.
|
|
*/
|
|
bool is_named_trigger(struct event_trigger_data *test)
|
|
{
|
|
struct event_trigger_data *data;
|
|
|
|
list_for_each_entry(data, &named_triggers, named_list) {
|
|
if (test == data)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* save_named_trigger - save the trigger in the named trigger list
|
|
* @name: The name of the named trigger set
|
|
* @data: The trigger data to save
|
|
*
|
|
* Return: 0 if successful, negative error otherwise.
|
|
*/
|
|
int save_named_trigger(const char *name, struct event_trigger_data *data)
|
|
{
|
|
data->name = kstrdup(name, GFP_KERNEL);
|
|
if (!data->name)
|
|
return -ENOMEM;
|
|
|
|
list_add(&data->named_list, &named_triggers);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* del_named_trigger - delete a trigger from the named trigger list
|
|
* @data: The trigger data to delete
|
|
*/
|
|
void del_named_trigger(struct event_trigger_data *data)
|
|
{
|
|
kfree(data->name);
|
|
data->name = NULL;
|
|
|
|
list_del(&data->named_list);
|
|
}
|
|
|
|
static void __pause_named_trigger(struct event_trigger_data *data, bool pause)
|
|
{
|
|
struct event_trigger_data *test;
|
|
|
|
list_for_each_entry(test, &named_triggers, named_list) {
|
|
if (strcmp(test->name, data->name) == 0) {
|
|
if (pause) {
|
|
test->paused_tmp = test->paused;
|
|
test->paused = true;
|
|
} else {
|
|
test->paused = test->paused_tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pause_named_trigger - Pause all named triggers with the same name
|
|
* @data: The trigger data of a named trigger to pause
|
|
*
|
|
* Pauses a named trigger along with all other triggers having the
|
|
* same name. Because named triggers share a common set of data,
|
|
* pausing only one is meaningless, so pausing one named trigger needs
|
|
* to pause all triggers with the same name.
|
|
*/
|
|
void pause_named_trigger(struct event_trigger_data *data)
|
|
{
|
|
__pause_named_trigger(data, true);
|
|
}
|
|
|
|
/**
|
|
* unpause_named_trigger - Un-pause all named triggers with the same name
|
|
* @data: The trigger data of a named trigger to unpause
|
|
*
|
|
* Un-pauses a named trigger along with all other triggers having the
|
|
* same name. Because named triggers share a common set of data,
|
|
* unpausing only one is meaningless, so unpausing one named trigger
|
|
* needs to unpause all triggers with the same name.
|
|
*/
|
|
void unpause_named_trigger(struct event_trigger_data *data)
|
|
{
|
|
__pause_named_trigger(data, false);
|
|
}
|
|
|
|
/**
|
|
* set_named_trigger_data - Associate common named trigger data
|
|
* @data: The trigger data to associate
|
|
* @named_data: The common named trigger to be associated
|
|
*
|
|
* Named triggers are sets of triggers that share a common set of
|
|
* trigger data. The first named trigger registered with a given name
|
|
* owns the common trigger data that the others subsequently
|
|
* registered with the same name will reference. This function
|
|
* associates the common trigger data from the first trigger with the
|
|
* given trigger.
|
|
*/
|
|
void set_named_trigger_data(struct event_trigger_data *data,
|
|
struct event_trigger_data *named_data)
|
|
{
|
|
data->named_data = named_data;
|
|
}
|
|
|
|
struct event_trigger_data *
|
|
get_named_trigger_data(struct event_trigger_data *data)
|
|
{
|
|
return data->named_data;
|
|
}
|
|
|
|
static void
|
|
traceon_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file) {
|
|
if (tracer_tracing_is_on(file->tr))
|
|
return;
|
|
|
|
tracer_tracing_on(file->tr);
|
|
return;
|
|
}
|
|
|
|
if (tracing_is_on())
|
|
return;
|
|
|
|
tracing_on();
|
|
}
|
|
|
|
static void
|
|
traceon_count_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file) {
|
|
if (tracer_tracing_is_on(file->tr))
|
|
return;
|
|
} else {
|
|
if (tracing_is_on())
|
|
return;
|
|
}
|
|
|
|
if (!data->count)
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
if (file)
|
|
tracer_tracing_on(file->tr);
|
|
else
|
|
tracing_on();
|
|
}
|
|
|
|
static void
|
|
traceoff_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file) {
|
|
if (!tracer_tracing_is_on(file->tr))
|
|
return;
|
|
|
|
tracer_tracing_off(file->tr);
|
|
return;
|
|
}
|
|
|
|
if (!tracing_is_on())
|
|
return;
|
|
|
|
tracing_off();
|
|
}
|
|
|
|
static void
|
|
traceoff_count_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file) {
|
|
if (!tracer_tracing_is_on(file->tr))
|
|
return;
|
|
} else {
|
|
if (!tracing_is_on())
|
|
return;
|
|
}
|
|
|
|
if (!data->count)
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
if (file)
|
|
tracer_tracing_off(file->tr);
|
|
else
|
|
tracing_off();
|
|
}
|
|
|
|
static int
|
|
traceon_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
return event_trigger_print("traceon", m, (void *)data->count,
|
|
data->filter_str);
|
|
}
|
|
|
|
static int
|
|
traceoff_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
return event_trigger_print("traceoff", m, (void *)data->count,
|
|
data->filter_str);
|
|
}
|
|
|
|
static struct event_trigger_ops traceon_trigger_ops = {
|
|
.trigger = traceon_trigger,
|
|
.print = traceon_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops traceon_count_trigger_ops = {
|
|
.trigger = traceon_count_trigger,
|
|
.print = traceon_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops traceoff_trigger_ops = {
|
|
.trigger = traceoff_trigger,
|
|
.print = traceoff_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops traceoff_count_trigger_ops = {
|
|
.trigger = traceoff_count_trigger,
|
|
.print = traceoff_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops *
|
|
onoff_get_trigger_ops(char *cmd, char *param)
|
|
{
|
|
struct event_trigger_ops *ops;
|
|
|
|
/* we register both traceon and traceoff to this callback */
|
|
if (strcmp(cmd, "traceon") == 0)
|
|
ops = param ? &traceon_count_trigger_ops :
|
|
&traceon_trigger_ops;
|
|
else
|
|
ops = param ? &traceoff_count_trigger_ops :
|
|
&traceoff_trigger_ops;
|
|
|
|
return ops;
|
|
}
|
|
|
|
static struct event_command trigger_traceon_cmd = {
|
|
.name = "traceon",
|
|
.trigger_type = ETT_TRACE_ONOFF,
|
|
.parse = event_trigger_parse,
|
|
.reg = register_trigger,
|
|
.unreg = unregister_trigger,
|
|
.get_trigger_ops = onoff_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static struct event_command trigger_traceoff_cmd = {
|
|
.name = "traceoff",
|
|
.trigger_type = ETT_TRACE_ONOFF,
|
|
.flags = EVENT_CMD_FL_POST_TRIGGER,
|
|
.parse = event_trigger_parse,
|
|
.reg = register_trigger,
|
|
.unreg = unregister_trigger,
|
|
.get_trigger_ops = onoff_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
#ifdef CONFIG_TRACER_SNAPSHOT
|
|
static void
|
|
snapshot_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file)
|
|
tracing_snapshot_instance(file->tr);
|
|
else
|
|
tracing_snapshot();
|
|
}
|
|
|
|
static void
|
|
snapshot_count_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
if (!data->count)
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
snapshot_trigger(data, buffer, rec, event);
|
|
}
|
|
|
|
static int
|
|
register_snapshot_trigger(char *glob,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file)
|
|
{
|
|
if (tracing_alloc_snapshot_instance(file->tr) != 0)
|
|
return 0;
|
|
|
|
return register_trigger(glob, data, file);
|
|
}
|
|
|
|
static int
|
|
snapshot_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
return event_trigger_print("snapshot", m, (void *)data->count,
|
|
data->filter_str);
|
|
}
|
|
|
|
static struct event_trigger_ops snapshot_trigger_ops = {
|
|
.trigger = snapshot_trigger,
|
|
.print = snapshot_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops snapshot_count_trigger_ops = {
|
|
.trigger = snapshot_count_trigger,
|
|
.print = snapshot_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops *
|
|
snapshot_get_trigger_ops(char *cmd, char *param)
|
|
{
|
|
return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops;
|
|
}
|
|
|
|
static struct event_command trigger_snapshot_cmd = {
|
|
.name = "snapshot",
|
|
.trigger_type = ETT_SNAPSHOT,
|
|
.parse = event_trigger_parse,
|
|
.reg = register_snapshot_trigger,
|
|
.unreg = unregister_trigger,
|
|
.get_trigger_ops = snapshot_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static __init int register_trigger_snapshot_cmd(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_snapshot_cmd);
|
|
WARN_ON(ret < 0);
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
static __init int register_trigger_snapshot_cmd(void) { return 0; }
|
|
#endif /* CONFIG_TRACER_SNAPSHOT */
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
#ifdef CONFIG_UNWINDER_ORC
|
|
/* Skip 2:
|
|
* event_triggers_post_call()
|
|
* trace_event_raw_event_xxx()
|
|
*/
|
|
# define STACK_SKIP 2
|
|
#else
|
|
/*
|
|
* Skip 4:
|
|
* stacktrace_trigger()
|
|
* event_triggers_post_call()
|
|
* trace_event_buffer_commit()
|
|
* trace_event_raw_event_xxx()
|
|
*/
|
|
#define STACK_SKIP 4
|
|
#endif
|
|
|
|
static void
|
|
stacktrace_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct trace_event_file *file = data->private_data;
|
|
|
|
if (file)
|
|
__trace_stack(file->tr, tracing_gen_ctx(), STACK_SKIP);
|
|
else
|
|
trace_dump_stack(STACK_SKIP);
|
|
}
|
|
|
|
static void
|
|
stacktrace_count_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
if (!data->count)
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
stacktrace_trigger(data, buffer, rec, event);
|
|
}
|
|
|
|
static int
|
|
stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
return event_trigger_print("stacktrace", m, (void *)data->count,
|
|
data->filter_str);
|
|
}
|
|
|
|
static struct event_trigger_ops stacktrace_trigger_ops = {
|
|
.trigger = stacktrace_trigger,
|
|
.print = stacktrace_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops stacktrace_count_trigger_ops = {
|
|
.trigger = stacktrace_count_trigger,
|
|
.print = stacktrace_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops *
|
|
stacktrace_get_trigger_ops(char *cmd, char *param)
|
|
{
|
|
return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops;
|
|
}
|
|
|
|
static struct event_command trigger_stacktrace_cmd = {
|
|
.name = "stacktrace",
|
|
.trigger_type = ETT_STACKTRACE,
|
|
.flags = EVENT_CMD_FL_POST_TRIGGER,
|
|
.parse = event_trigger_parse,
|
|
.reg = register_trigger,
|
|
.unreg = unregister_trigger,
|
|
.get_trigger_ops = stacktrace_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static __init int register_trigger_stacktrace_cmd(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_stacktrace_cmd);
|
|
WARN_ON(ret < 0);
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
static __init int register_trigger_stacktrace_cmd(void) { return 0; }
|
|
#endif /* CONFIG_STACKTRACE */
|
|
|
|
static __init void unregister_trigger_traceon_traceoff_cmds(void)
|
|
{
|
|
unregister_event_command(&trigger_traceon_cmd);
|
|
unregister_event_command(&trigger_traceoff_cmd);
|
|
}
|
|
|
|
static void
|
|
event_enable_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
|
|
if (enable_data->enable)
|
|
clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags);
|
|
else
|
|
set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags);
|
|
}
|
|
|
|
static void
|
|
event_enable_count_trigger(struct event_trigger_data *data,
|
|
struct trace_buffer *buffer, void *rec,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
|
|
if (!data->count)
|
|
return;
|
|
|
|
/* Skip if the event is in a state we want to switch to */
|
|
if (enable_data->enable == !(enable_data->file->flags & EVENT_FILE_FL_SOFT_DISABLED))
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
event_enable_trigger(data, buffer, rec, event);
|
|
}
|
|
|
|
int event_enable_trigger_print(struct seq_file *m,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
|
|
seq_printf(m, "%s:%s:%s",
|
|
enable_data->hist ?
|
|
(enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) :
|
|
(enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR),
|
|
enable_data->file->event_call->class->system,
|
|
trace_event_name(enable_data->file->event_call));
|
|
|
|
if (data->count == -1)
|
|
seq_puts(m, ":unlimited");
|
|
else
|
|
seq_printf(m, ":count=%ld", data->count);
|
|
|
|
if (data->filter_str)
|
|
seq_printf(m, " if %s\n", data->filter_str);
|
|
else
|
|
seq_putc(m, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
void event_enable_trigger_free(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
|
|
if (WARN_ON_ONCE(data->ref <= 0))
|
|
return;
|
|
|
|
data->ref--;
|
|
if (!data->ref) {
|
|
/* Remove the SOFT_MODE flag */
|
|
trace_event_enable_disable(enable_data->file, 0, 1);
|
|
trace_event_put_ref(enable_data->file->event_call);
|
|
trigger_data_free(data);
|
|
kfree(enable_data);
|
|
}
|
|
}
|
|
|
|
static struct event_trigger_ops event_enable_trigger_ops = {
|
|
.trigger = event_enable_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops event_enable_count_trigger_ops = {
|
|
.trigger = event_enable_count_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops event_disable_trigger_ops = {
|
|
.trigger = event_enable_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops event_disable_count_trigger_ops = {
|
|
.trigger = event_enable_count_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
int event_enable_trigger_parse(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob, char *cmd, char *param)
|
|
{
|
|
struct trace_event_file *event_enable_file;
|
|
struct enable_trigger_data *enable_data;
|
|
struct event_trigger_data *trigger_data;
|
|
struct event_trigger_ops *trigger_ops;
|
|
struct trace_array *tr = file->tr;
|
|
const char *system;
|
|
const char *event;
|
|
bool hist = false;
|
|
char *trigger;
|
|
char *number;
|
|
bool enable;
|
|
int ret;
|
|
|
|
if (!param)
|
|
return -EINVAL;
|
|
|
|
/* separate the trigger from the filter (s:e:n [if filter]) */
|
|
trigger = strsep(¶m, " \t");
|
|
if (!trigger)
|
|
return -EINVAL;
|
|
if (param) {
|
|
param = skip_spaces(param);
|
|
if (!*param)
|
|
param = NULL;
|
|
}
|
|
|
|
system = strsep(&trigger, ":");
|
|
if (!trigger)
|
|
return -EINVAL;
|
|
|
|
event = strsep(&trigger, ":");
|
|
|
|
ret = -EINVAL;
|
|
event_enable_file = find_event_file(tr, system, event);
|
|
if (!event_enable_file)
|
|
goto out;
|
|
|
|
#ifdef CONFIG_HIST_TRIGGERS
|
|
hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) ||
|
|
(strcmp(cmd, DISABLE_HIST_STR) == 0));
|
|
|
|
enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
|
|
(strcmp(cmd, ENABLE_HIST_STR) == 0));
|
|
#else
|
|
enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
|
|
#endif
|
|
trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
|
|
|
|
ret = -ENOMEM;
|
|
trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
|
|
if (!trigger_data)
|
|
goto out;
|
|
|
|
enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL);
|
|
if (!enable_data) {
|
|
kfree(trigger_data);
|
|
goto out;
|
|
}
|
|
|
|
trigger_data->count = -1;
|
|
trigger_data->ops = trigger_ops;
|
|
trigger_data->cmd_ops = cmd_ops;
|
|
INIT_LIST_HEAD(&trigger_data->list);
|
|
RCU_INIT_POINTER(trigger_data->filter, NULL);
|
|
|
|
enable_data->hist = hist;
|
|
enable_data->enable = enable;
|
|
enable_data->file = event_enable_file;
|
|
trigger_data->private_data = enable_data;
|
|
|
|
if (glob[0] == '!') {
|
|
cmd_ops->unreg(glob+1, trigger_data, file);
|
|
kfree(trigger_data);
|
|
kfree(enable_data);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* Up the trigger_data count to make sure nothing frees it on failure */
|
|
event_trigger_init(trigger_ops, trigger_data);
|
|
|
|
if (trigger) {
|
|
number = strsep(&trigger, ":");
|
|
|
|
ret = -EINVAL;
|
|
if (!strlen(number))
|
|
goto out_free;
|
|
|
|
/*
|
|
* We use the callback data field (which is a pointer)
|
|
* as our counter.
|
|
*/
|
|
ret = kstrtoul(number, 0, &trigger_data->count);
|
|
if (ret)
|
|
goto out_free;
|
|
}
|
|
|
|
if (!param) /* if param is non-empty, it's supposed to be a filter */
|
|
goto out_reg;
|
|
|
|
if (!cmd_ops->set_filter)
|
|
goto out_reg;
|
|
|
|
ret = cmd_ops->set_filter(param, trigger_data, file);
|
|
if (ret < 0)
|
|
goto out_free;
|
|
|
|
out_reg:
|
|
/* Don't let event modules unload while probe registered */
|
|
ret = trace_event_try_get_ref(event_enable_file->event_call);
|
|
if (!ret) {
|
|
ret = -EBUSY;
|
|
goto out_free;
|
|
}
|
|
|
|
ret = trace_event_enable_disable(event_enable_file, 1, 1);
|
|
if (ret < 0)
|
|
goto out_put;
|
|
ret = cmd_ops->reg(glob, trigger_data, file);
|
|
/*
|
|
* The above returns on success the # of functions enabled,
|
|
* but if it didn't find any functions it returns zero.
|
|
* Consider no functions a failure too.
|
|
*/
|
|
if (!ret) {
|
|
ret = -ENOENT;
|
|
goto out_disable;
|
|
} else if (ret < 0)
|
|
goto out_disable;
|
|
/* Just return zero, not the number of enabled functions */
|
|
ret = 0;
|
|
event_trigger_free(trigger_ops, trigger_data);
|
|
out:
|
|
return ret;
|
|
|
|
out_disable:
|
|
trace_event_enable_disable(event_enable_file, 0, 1);
|
|
out_put:
|
|
trace_event_put_ref(event_enable_file->event_call);
|
|
out_free:
|
|
if (cmd_ops->set_filter)
|
|
cmd_ops->set_filter(NULL, trigger_data, NULL);
|
|
event_trigger_free(trigger_ops, trigger_data);
|
|
kfree(enable_data);
|
|
goto out;
|
|
}
|
|
|
|
int event_enable_register_trigger(char *glob,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
struct enable_trigger_data *test_enable_data;
|
|
struct event_trigger_data *test;
|
|
int ret = 0;
|
|
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
list_for_each_entry(test, &file->triggers, list) {
|
|
test_enable_data = test->private_data;
|
|
if (test_enable_data &&
|
|
(test->cmd_ops->trigger_type ==
|
|
data->cmd_ops->trigger_type) &&
|
|
(test_enable_data->file == enable_data->file)) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (data->ops->init) {
|
|
ret = data->ops->init(data->ops, data);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_add_rcu(&data->list, &file->triggers);
|
|
ret++;
|
|
|
|
update_cond_flag(file);
|
|
if (trace_event_trigger_enable_disable(file, 1) < 0) {
|
|
list_del_rcu(&data->list);
|
|
update_cond_flag(file);
|
|
ret--;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void event_enable_unregister_trigger(char *glob,
|
|
struct event_trigger_data *test,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct enable_trigger_data *test_enable_data = test->private_data;
|
|
struct enable_trigger_data *enable_data;
|
|
struct event_trigger_data *data;
|
|
bool unregistered = false;
|
|
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
list_for_each_entry(data, &file->triggers, list) {
|
|
enable_data = data->private_data;
|
|
if (enable_data &&
|
|
(data->cmd_ops->trigger_type ==
|
|
test->cmd_ops->trigger_type) &&
|
|
(enable_data->file == test_enable_data->file)) {
|
|
unregistered = true;
|
|
list_del_rcu(&data->list);
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
update_cond_flag(file);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (unregistered && data->ops->free)
|
|
data->ops->free(data->ops, data);
|
|
}
|
|
|
|
static struct event_trigger_ops *
|
|
event_enable_get_trigger_ops(char *cmd, char *param)
|
|
{
|
|
struct event_trigger_ops *ops;
|
|
bool enable;
|
|
|
|
#ifdef CONFIG_HIST_TRIGGERS
|
|
enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
|
|
(strcmp(cmd, ENABLE_HIST_STR) == 0));
|
|
#else
|
|
enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
|
|
#endif
|
|
if (enable)
|
|
ops = param ? &event_enable_count_trigger_ops :
|
|
&event_enable_trigger_ops;
|
|
else
|
|
ops = param ? &event_disable_count_trigger_ops :
|
|
&event_disable_trigger_ops;
|
|
|
|
return ops;
|
|
}
|
|
|
|
static struct event_command trigger_enable_cmd = {
|
|
.name = ENABLE_EVENT_STR,
|
|
.trigger_type = ETT_EVENT_ENABLE,
|
|
.parse = event_enable_trigger_parse,
|
|
.reg = event_enable_register_trigger,
|
|
.unreg = event_enable_unregister_trigger,
|
|
.get_trigger_ops = event_enable_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static struct event_command trigger_disable_cmd = {
|
|
.name = DISABLE_EVENT_STR,
|
|
.trigger_type = ETT_EVENT_ENABLE,
|
|
.parse = event_enable_trigger_parse,
|
|
.reg = event_enable_register_trigger,
|
|
.unreg = event_enable_unregister_trigger,
|
|
.get_trigger_ops = event_enable_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static __init void unregister_trigger_enable_disable_cmds(void)
|
|
{
|
|
unregister_event_command(&trigger_enable_cmd);
|
|
unregister_event_command(&trigger_disable_cmd);
|
|
}
|
|
|
|
static __init int register_trigger_enable_disable_cmds(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_enable_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
return ret;
|
|
ret = register_event_command(&trigger_disable_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
unregister_trigger_enable_disable_cmds();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static __init int register_trigger_traceon_traceoff_cmds(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_traceon_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
return ret;
|
|
ret = register_event_command(&trigger_traceoff_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
unregister_trigger_traceon_traceoff_cmds();
|
|
|
|
return ret;
|
|
}
|
|
|
|
__init int register_trigger_cmds(void)
|
|
{
|
|
register_trigger_traceon_traceoff_cmds();
|
|
register_trigger_snapshot_cmd();
|
|
register_trigger_stacktrace_cmd();
|
|
register_trigger_enable_disable_cmds();
|
|
register_trigger_hist_enable_disable_cmds();
|
|
register_trigger_hist_cmd();
|
|
|
|
return 0;
|
|
}
|