forked from Minki/linux
1a41442864
Currently both the wakeup and irqsoff traces do not handle set_graph_notrace
well. The ftrace infrastructure will ignore the return paths of all
functions leaving them hanging without an end:
# echo '*spin*' > set_graph_notrace
# cat trace
[...]
_raw_spin_lock() {
preempt_count_add() {
do_raw_spin_lock() {
update_rq_clock();
Where the '*spin*' functions should have looked like this:
_raw_spin_lock() {
preempt_count_add();
do_raw_spin_lock();
}
update_rq_clock();
Instead, have the wakeup and irqsoff tracers ignore the functions that are
set by the set_graph_notrace like the function_graph tracer does. Move
the logic in the function_graph tracer into a header to allow wakeup and
irqsoff tracers to use it as well.
Cc: Namhyung Kim <namhyung.kim@lge.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
1690 lines
53 KiB
C
1690 lines
53 KiB
C
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#ifndef _LINUX_KERNEL_TRACE_H
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#define _LINUX_KERNEL_TRACE_H
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#include <linux/fs.h>
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#include <linux/atomic.h>
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#include <linux/sched.h>
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#include <linux/clocksource.h>
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#include <linux/ring_buffer.h>
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#include <linux/mmiotrace.h>
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#include <linux/tracepoint.h>
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#include <linux/ftrace.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/trace_seq.h>
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#include <linux/trace_events.h>
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#include <linux/compiler.h>
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#include <linux/trace_seq.h>
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#include <linux/glob.h>
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#ifdef CONFIG_FTRACE_SYSCALLS
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#include <asm/unistd.h> /* For NR_SYSCALLS */
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#include <asm/syscall.h> /* some archs define it here */
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#endif
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enum trace_type {
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__TRACE_FIRST_TYPE = 0,
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TRACE_FN,
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TRACE_CTX,
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TRACE_WAKE,
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TRACE_STACK,
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TRACE_PRINT,
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TRACE_BPRINT,
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TRACE_MMIO_RW,
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TRACE_MMIO_MAP,
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TRACE_BRANCH,
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TRACE_GRAPH_RET,
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TRACE_GRAPH_ENT,
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TRACE_USER_STACK,
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TRACE_BLK,
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TRACE_BPUTS,
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TRACE_HWLAT,
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TRACE_RAW_DATA,
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__TRACE_LAST_TYPE,
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};
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#undef __field
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#define __field(type, item) type item;
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#undef __field_struct
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#define __field_struct(type, item) __field(type, item)
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#undef __field_desc
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#define __field_desc(type, container, item)
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#undef __array
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#define __array(type, item, size) type item[size];
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#undef __array_desc
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#define __array_desc(type, container, item, size)
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#undef __dynamic_array
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#define __dynamic_array(type, item) type item[];
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#undef F_STRUCT
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#define F_STRUCT(args...) args
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#undef FTRACE_ENTRY
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
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struct struct_name { \
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struct trace_entry ent; \
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tstruct \
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}
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#undef FTRACE_ENTRY_DUP
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#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
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#undef FTRACE_ENTRY_REG
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#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
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filter, regfn) \
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
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filter)
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#undef FTRACE_ENTRY_PACKED
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#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \
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filter) \
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
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filter) __packed
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#include "trace_entries.h"
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/*
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* syscalls are special, and need special handling, this is why
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* they are not included in trace_entries.h
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*/
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struct syscall_trace_enter {
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struct trace_entry ent;
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int nr;
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unsigned long args[];
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};
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struct syscall_trace_exit {
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struct trace_entry ent;
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int nr;
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long ret;
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};
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struct kprobe_trace_entry_head {
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struct trace_entry ent;
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unsigned long ip;
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};
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struct kretprobe_trace_entry_head {
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struct trace_entry ent;
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unsigned long func;
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unsigned long ret_ip;
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};
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/*
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* trace_flag_type is an enumeration that holds different
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* states when a trace occurs. These are:
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* IRQS_OFF - interrupts were disabled
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* IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
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* NEED_RESCHED - reschedule is requested
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* HARDIRQ - inside an interrupt handler
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* SOFTIRQ - inside a softirq handler
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*/
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enum trace_flag_type {
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TRACE_FLAG_IRQS_OFF = 0x01,
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TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
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TRACE_FLAG_NEED_RESCHED = 0x04,
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TRACE_FLAG_HARDIRQ = 0x08,
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TRACE_FLAG_SOFTIRQ = 0x10,
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TRACE_FLAG_PREEMPT_RESCHED = 0x20,
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TRACE_FLAG_NMI = 0x40,
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};
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#define TRACE_BUF_SIZE 1024
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struct trace_array;
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/*
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* The CPU trace array - it consists of thousands of trace entries
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* plus some other descriptor data: (for example which task started
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* the trace, etc.)
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*/
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struct trace_array_cpu {
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atomic_t disabled;
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void *buffer_page; /* ring buffer spare */
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unsigned long entries;
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unsigned long saved_latency;
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unsigned long critical_start;
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unsigned long critical_end;
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unsigned long critical_sequence;
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unsigned long nice;
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unsigned long policy;
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unsigned long rt_priority;
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unsigned long skipped_entries;
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cycle_t preempt_timestamp;
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pid_t pid;
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kuid_t uid;
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char comm[TASK_COMM_LEN];
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bool ignore_pid;
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#ifdef CONFIG_FUNCTION_TRACER
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bool ftrace_ignore_pid;
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#endif
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};
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struct tracer;
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struct trace_option_dentry;
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struct trace_buffer {
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struct trace_array *tr;
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struct ring_buffer *buffer;
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struct trace_array_cpu __percpu *data;
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cycle_t time_start;
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int cpu;
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};
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#define TRACE_FLAGS_MAX_SIZE 32
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struct trace_options {
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struct tracer *tracer;
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struct trace_option_dentry *topts;
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};
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struct trace_pid_list {
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int pid_max;
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unsigned long *pids;
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};
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/*
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* The trace array - an array of per-CPU trace arrays. This is the
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* highest level data structure that individual tracers deal with.
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* They have on/off state as well:
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*/
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struct trace_array {
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struct list_head list;
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char *name;
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struct trace_buffer trace_buffer;
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#ifdef CONFIG_TRACER_MAX_TRACE
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/*
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* The max_buffer is used to snapshot the trace when a maximum
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* latency is reached, or when the user initiates a snapshot.
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* Some tracers will use this to store a maximum trace while
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* it continues examining live traces.
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*
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* The buffers for the max_buffer are set up the same as the trace_buffer
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* When a snapshot is taken, the buffer of the max_buffer is swapped
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* with the buffer of the trace_buffer and the buffers are reset for
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* the trace_buffer so the tracing can continue.
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*/
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struct trace_buffer max_buffer;
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bool allocated_snapshot;
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#endif
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#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
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unsigned long max_latency;
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#endif
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struct trace_pid_list __rcu *filtered_pids;
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/*
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* max_lock is used to protect the swapping of buffers
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* when taking a max snapshot. The buffers themselves are
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* protected by per_cpu spinlocks. But the action of the swap
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* needs its own lock.
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*
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* This is defined as a arch_spinlock_t in order to help
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* with performance when lockdep debugging is enabled.
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*
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* It is also used in other places outside the update_max_tr
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* so it needs to be defined outside of the
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* CONFIG_TRACER_MAX_TRACE.
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*/
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arch_spinlock_t max_lock;
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int buffer_disabled;
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#ifdef CONFIG_FTRACE_SYSCALLS
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int sys_refcount_enter;
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int sys_refcount_exit;
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struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
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struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
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#endif
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int stop_count;
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int clock_id;
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int nr_topts;
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struct tracer *current_trace;
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unsigned int trace_flags;
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unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
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unsigned int flags;
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raw_spinlock_t start_lock;
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struct dentry *dir;
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struct dentry *options;
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struct dentry *percpu_dir;
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struct dentry *event_dir;
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struct trace_options *topts;
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struct list_head systems;
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struct list_head events;
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cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
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int ref;
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#ifdef CONFIG_FUNCTION_TRACER
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struct ftrace_ops *ops;
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struct trace_pid_list __rcu *function_pids;
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/* function tracing enabled */
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int function_enabled;
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#endif
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};
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enum {
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TRACE_ARRAY_FL_GLOBAL = (1 << 0)
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};
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extern struct list_head ftrace_trace_arrays;
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extern struct mutex trace_types_lock;
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extern int trace_array_get(struct trace_array *tr);
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extern void trace_array_put(struct trace_array *tr);
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/*
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* The global tracer (top) should be the first trace array added,
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* but we check the flag anyway.
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*/
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static inline struct trace_array *top_trace_array(void)
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{
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struct trace_array *tr;
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if (list_empty(&ftrace_trace_arrays))
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return NULL;
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tr = list_entry(ftrace_trace_arrays.prev,
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typeof(*tr), list);
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WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
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return tr;
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}
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#define FTRACE_CMP_TYPE(var, type) \
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__builtin_types_compatible_p(typeof(var), type *)
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#undef IF_ASSIGN
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#define IF_ASSIGN(var, entry, etype, id) \
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if (FTRACE_CMP_TYPE(var, etype)) { \
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var = (typeof(var))(entry); \
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WARN_ON(id && (entry)->type != id); \
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break; \
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}
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/* Will cause compile errors if type is not found. */
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extern void __ftrace_bad_type(void);
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/*
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* The trace_assign_type is a verifier that the entry type is
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* the same as the type being assigned. To add new types simply
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* add a line with the following format:
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*
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* IF_ASSIGN(var, ent, type, id);
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*
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* Where "type" is the trace type that includes the trace_entry
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* as the "ent" item. And "id" is the trace identifier that is
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* used in the trace_type enum.
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*
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* If the type can have more than one id, then use zero.
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*/
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#define trace_assign_type(var, ent) \
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do { \
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IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
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IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
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IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
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IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
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IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
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IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
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IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
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IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
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IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
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IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
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TRACE_MMIO_RW); \
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IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
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TRACE_MMIO_MAP); \
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IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
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IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
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TRACE_GRAPH_ENT); \
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IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
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TRACE_GRAPH_RET); \
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__ftrace_bad_type(); \
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} while (0)
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/*
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* An option specific to a tracer. This is a boolean value.
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* The bit is the bit index that sets its value on the
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* flags value in struct tracer_flags.
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*/
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struct tracer_opt {
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const char *name; /* Will appear on the trace_options file */
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u32 bit; /* Mask assigned in val field in tracer_flags */
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};
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/*
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* The set of specific options for a tracer. Your tracer
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* have to set the initial value of the flags val.
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*/
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struct tracer_flags {
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u32 val;
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struct tracer_opt *opts;
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struct tracer *trace;
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};
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/* Makes more easy to define a tracer opt */
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#define TRACER_OPT(s, b) .name = #s, .bit = b
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struct trace_option_dentry {
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struct tracer_opt *opt;
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struct tracer_flags *flags;
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struct trace_array *tr;
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struct dentry *entry;
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};
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/**
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* struct tracer - a specific tracer and its callbacks to interact with tracefs
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* @name: the name chosen to select it on the available_tracers file
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* @init: called when one switches to this tracer (echo name > current_tracer)
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* @reset: called when one switches to another tracer
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* @start: called when tracing is unpaused (echo 1 > tracing_on)
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* @stop: called when tracing is paused (echo 0 > tracing_on)
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* @update_thresh: called when tracing_thresh is updated
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* @open: called when the trace file is opened
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* @pipe_open: called when the trace_pipe file is opened
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* @close: called when the trace file is released
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* @pipe_close: called when the trace_pipe file is released
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* @read: override the default read callback on trace_pipe
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* @splice_read: override the default splice_read callback on trace_pipe
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* @selftest: selftest to run on boot (see trace_selftest.c)
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* @print_headers: override the first lines that describe your columns
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* @print_line: callback that prints a trace
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* @set_flag: signals one of your private flags changed (trace_options file)
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* @flags: your private flags
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*/
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struct tracer {
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const char *name;
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int (*init)(struct trace_array *tr);
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void (*reset)(struct trace_array *tr);
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void (*start)(struct trace_array *tr);
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void (*stop)(struct trace_array *tr);
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int (*update_thresh)(struct trace_array *tr);
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void (*open)(struct trace_iterator *iter);
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void (*pipe_open)(struct trace_iterator *iter);
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void (*close)(struct trace_iterator *iter);
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void (*pipe_close)(struct trace_iterator *iter);
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ssize_t (*read)(struct trace_iterator *iter,
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struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos);
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ssize_t (*splice_read)(struct trace_iterator *iter,
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struct file *filp,
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loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t len,
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unsigned int flags);
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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int (*selftest)(struct tracer *trace,
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struct trace_array *tr);
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#endif
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void (*print_header)(struct seq_file *m);
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enum print_line_t (*print_line)(struct trace_iterator *iter);
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/* If you handled the flag setting, return 0 */
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int (*set_flag)(struct trace_array *tr,
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u32 old_flags, u32 bit, int set);
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/* Return 0 if OK with change, else return non-zero */
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int (*flag_changed)(struct trace_array *tr,
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u32 mask, int set);
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struct tracer *next;
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struct tracer_flags *flags;
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int enabled;
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int ref;
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bool print_max;
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bool allow_instances;
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#ifdef CONFIG_TRACER_MAX_TRACE
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bool use_max_tr;
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#endif
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};
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/* Only current can touch trace_recursion */
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/*
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* For function tracing recursion:
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* The order of these bits are important.
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*
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* When function tracing occurs, the following steps are made:
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* If arch does not support a ftrace feature:
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* call internal function (uses INTERNAL bits) which calls...
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* If callback is registered to the "global" list, the list
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* function is called and recursion checks the GLOBAL bits.
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* then this function calls...
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* The function callback, which can use the FTRACE bits to
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* check for recursion.
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*
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* Now if the arch does not suppport a feature, and it calls
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* the global list function which calls the ftrace callback
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* all three of these steps will do a recursion protection.
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* There's no reason to do one if the previous caller already
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* did. The recursion that we are protecting against will
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* go through the same steps again.
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*
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* To prevent the multiple recursion checks, if a recursion
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* bit is set that is higher than the MAX bit of the current
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* check, then we know that the check was made by the previous
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* caller, and we can skip the current check.
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*/
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enum {
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TRACE_BUFFER_BIT,
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TRACE_BUFFER_NMI_BIT,
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TRACE_BUFFER_IRQ_BIT,
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TRACE_BUFFER_SIRQ_BIT,
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/* Start of function recursion bits */
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TRACE_FTRACE_BIT,
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TRACE_FTRACE_NMI_BIT,
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TRACE_FTRACE_IRQ_BIT,
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TRACE_FTRACE_SIRQ_BIT,
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/* INTERNAL_BITs must be greater than FTRACE_BITs */
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TRACE_INTERNAL_BIT,
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TRACE_INTERNAL_NMI_BIT,
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TRACE_INTERNAL_IRQ_BIT,
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TRACE_INTERNAL_SIRQ_BIT,
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TRACE_BRANCH_BIT,
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/*
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* Abuse of the trace_recursion.
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* As we need a way to maintain state if we are tracing the function
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* graph in irq because we want to trace a particular function that
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* was called in irq context but we have irq tracing off. Since this
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* can only be modified by current, we can reuse trace_recursion.
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*/
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TRACE_IRQ_BIT,
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};
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|
|
#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
|
|
#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
|
|
#define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
|
|
|
|
#define TRACE_CONTEXT_BITS 4
|
|
|
|
#define TRACE_FTRACE_START TRACE_FTRACE_BIT
|
|
#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
|
|
|
|
#define TRACE_LIST_START TRACE_INTERNAL_BIT
|
|
#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
|
|
|
|
#define TRACE_CONTEXT_MASK TRACE_LIST_MAX
|
|
|
|
static __always_inline int trace_get_context_bit(void)
|
|
{
|
|
int bit;
|
|
|
|
if (in_interrupt()) {
|
|
if (in_nmi())
|
|
bit = 0;
|
|
|
|
else if (in_irq())
|
|
bit = 1;
|
|
else
|
|
bit = 2;
|
|
} else
|
|
bit = 3;
|
|
|
|
return bit;
|
|
}
|
|
|
|
static __always_inline int trace_test_and_set_recursion(int start, int max)
|
|
{
|
|
unsigned int val = current->trace_recursion;
|
|
int bit;
|
|
|
|
/* A previous recursion check was made */
|
|
if ((val & TRACE_CONTEXT_MASK) > max)
|
|
return 0;
|
|
|
|
bit = trace_get_context_bit() + start;
|
|
if (unlikely(val & (1 << bit)))
|
|
return -1;
|
|
|
|
val |= 1 << bit;
|
|
current->trace_recursion = val;
|
|
barrier();
|
|
|
|
return bit;
|
|
}
|
|
|
|
static __always_inline void trace_clear_recursion(int bit)
|
|
{
|
|
unsigned int val = current->trace_recursion;
|
|
|
|
if (!bit)
|
|
return;
|
|
|
|
bit = 1 << bit;
|
|
val &= ~bit;
|
|
|
|
barrier();
|
|
current->trace_recursion = val;
|
|
}
|
|
|
|
static inline struct ring_buffer_iter *
|
|
trace_buffer_iter(struct trace_iterator *iter, int cpu)
|
|
{
|
|
if (iter->buffer_iter && iter->buffer_iter[cpu])
|
|
return iter->buffer_iter[cpu];
|
|
return NULL;
|
|
}
|
|
|
|
int tracer_init(struct tracer *t, struct trace_array *tr);
|
|
int tracing_is_enabled(void);
|
|
void tracing_reset(struct trace_buffer *buf, int cpu);
|
|
void tracing_reset_online_cpus(struct trace_buffer *buf);
|
|
void tracing_reset_current(int cpu);
|
|
void tracing_reset_all_online_cpus(void);
|
|
int tracing_open_generic(struct inode *inode, struct file *filp);
|
|
bool tracing_is_disabled(void);
|
|
int tracer_tracing_is_on(struct trace_array *tr);
|
|
struct dentry *trace_create_file(const char *name,
|
|
umode_t mode,
|
|
struct dentry *parent,
|
|
void *data,
|
|
const struct file_operations *fops);
|
|
|
|
struct dentry *tracing_init_dentry(void);
|
|
|
|
struct ring_buffer_event;
|
|
|
|
struct ring_buffer_event *
|
|
trace_buffer_lock_reserve(struct ring_buffer *buffer,
|
|
int type,
|
|
unsigned long len,
|
|
unsigned long flags,
|
|
int pc);
|
|
|
|
struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
|
|
struct trace_array_cpu *data);
|
|
|
|
struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
|
|
int *ent_cpu, u64 *ent_ts);
|
|
|
|
void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
|
|
int trace_empty(struct trace_iterator *iter);
|
|
|
|
void *trace_find_next_entry_inc(struct trace_iterator *iter);
|
|
|
|
void trace_init_global_iter(struct trace_iterator *iter);
|
|
|
|
void tracing_iter_reset(struct trace_iterator *iter, int cpu);
|
|
|
|
void trace_function(struct trace_array *tr,
|
|
unsigned long ip,
|
|
unsigned long parent_ip,
|
|
unsigned long flags, int pc);
|
|
void trace_graph_function(struct trace_array *tr,
|
|
unsigned long ip,
|
|
unsigned long parent_ip,
|
|
unsigned long flags, int pc);
|
|
void trace_latency_header(struct seq_file *m);
|
|
void trace_default_header(struct seq_file *m);
|
|
void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
|
|
int trace_empty(struct trace_iterator *iter);
|
|
|
|
void trace_graph_return(struct ftrace_graph_ret *trace);
|
|
int trace_graph_entry(struct ftrace_graph_ent *trace);
|
|
void set_graph_array(struct trace_array *tr);
|
|
|
|
void tracing_start_cmdline_record(void);
|
|
void tracing_stop_cmdline_record(void);
|
|
int register_tracer(struct tracer *type);
|
|
int is_tracing_stopped(void);
|
|
|
|
loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
|
|
|
|
extern cpumask_var_t __read_mostly tracing_buffer_mask;
|
|
|
|
#define for_each_tracing_cpu(cpu) \
|
|
for_each_cpu(cpu, tracing_buffer_mask)
|
|
|
|
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
|
|
|
|
extern unsigned long tracing_thresh;
|
|
|
|
/* PID filtering */
|
|
|
|
extern int pid_max;
|
|
|
|
bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
|
|
pid_t search_pid);
|
|
bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
|
|
struct task_struct *task);
|
|
void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
|
|
struct task_struct *self,
|
|
struct task_struct *task);
|
|
void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
|
|
void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
|
|
int trace_pid_show(struct seq_file *m, void *v);
|
|
void trace_free_pid_list(struct trace_pid_list *pid_list);
|
|
int trace_pid_write(struct trace_pid_list *filtered_pids,
|
|
struct trace_pid_list **new_pid_list,
|
|
const char __user *ubuf, size_t cnt);
|
|
|
|
#ifdef CONFIG_TRACER_MAX_TRACE
|
|
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
|
|
void update_max_tr_single(struct trace_array *tr,
|
|
struct task_struct *tsk, int cpu);
|
|
#endif /* CONFIG_TRACER_MAX_TRACE */
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
|
|
int pc);
|
|
|
|
void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
|
|
int pc);
|
|
#else
|
|
static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
|
|
unsigned long flags, int pc)
|
|
{
|
|
}
|
|
|
|
static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
|
|
int skip, int pc)
|
|
{
|
|
}
|
|
#endif /* CONFIG_STACKTRACE */
|
|
|
|
extern cycle_t ftrace_now(int cpu);
|
|
|
|
extern void trace_find_cmdline(int pid, char comm[]);
|
|
extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
extern unsigned long ftrace_update_tot_cnt;
|
|
#endif
|
|
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
|
|
extern int DYN_FTRACE_TEST_NAME(void);
|
|
#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
|
|
extern int DYN_FTRACE_TEST_NAME2(void);
|
|
|
|
extern bool ring_buffer_expanded;
|
|
extern bool tracing_selftest_disabled;
|
|
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
extern int trace_selftest_startup_function(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_function_graph(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_wakeup(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_nop(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
extern int trace_selftest_startup_branch(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
/*
|
|
* Tracer data references selftest functions that only occur
|
|
* on boot up. These can be __init functions. Thus, when selftests
|
|
* are enabled, then the tracers need to reference __init functions.
|
|
*/
|
|
#define __tracer_data __refdata
|
|
#else
|
|
/* Tracers are seldom changed. Optimize when selftests are disabled. */
|
|
#define __tracer_data __read_mostly
|
|
#endif /* CONFIG_FTRACE_STARTUP_TEST */
|
|
|
|
extern void *head_page(struct trace_array_cpu *data);
|
|
extern unsigned long long ns2usecs(cycle_t nsec);
|
|
extern int
|
|
trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
|
|
extern int
|
|
trace_vprintk(unsigned long ip, const char *fmt, va_list args);
|
|
extern int
|
|
trace_array_vprintk(struct trace_array *tr,
|
|
unsigned long ip, const char *fmt, va_list args);
|
|
int trace_array_printk(struct trace_array *tr,
|
|
unsigned long ip, const char *fmt, ...);
|
|
int trace_array_printk_buf(struct ring_buffer *buffer,
|
|
unsigned long ip, const char *fmt, ...);
|
|
void trace_printk_seq(struct trace_seq *s);
|
|
enum print_line_t print_trace_line(struct trace_iterator *iter);
|
|
|
|
extern char trace_find_mark(unsigned long long duration);
|
|
|
|
/* Standard output formatting function used for function return traces */
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
/* Flag options */
|
|
#define TRACE_GRAPH_PRINT_OVERRUN 0x1
|
|
#define TRACE_GRAPH_PRINT_CPU 0x2
|
|
#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
|
|
#define TRACE_GRAPH_PRINT_PROC 0x8
|
|
#define TRACE_GRAPH_PRINT_DURATION 0x10
|
|
#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
|
|
#define TRACE_GRAPH_PRINT_IRQS 0x40
|
|
#define TRACE_GRAPH_PRINT_TAIL 0x80
|
|
#define TRACE_GRAPH_SLEEP_TIME 0x100
|
|
#define TRACE_GRAPH_GRAPH_TIME 0x200
|
|
#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
|
|
#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
|
|
|
|
extern void ftrace_graph_sleep_time_control(bool enable);
|
|
extern void ftrace_graph_graph_time_control(bool enable);
|
|
|
|
extern enum print_line_t
|
|
print_graph_function_flags(struct trace_iterator *iter, u32 flags);
|
|
extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
|
|
extern void
|
|
trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
|
|
extern void graph_trace_open(struct trace_iterator *iter);
|
|
extern void graph_trace_close(struct trace_iterator *iter);
|
|
extern int __trace_graph_entry(struct trace_array *tr,
|
|
struct ftrace_graph_ent *trace,
|
|
unsigned long flags, int pc);
|
|
extern void __trace_graph_return(struct trace_array *tr,
|
|
struct ftrace_graph_ret *trace,
|
|
unsigned long flags, int pc);
|
|
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
/* TODO: make this variable */
|
|
#define FTRACE_GRAPH_MAX_FUNCS 32
|
|
extern int ftrace_graph_count;
|
|
extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
|
extern int ftrace_graph_notrace_count;
|
|
extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
|
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
{
|
|
int i;
|
|
|
|
if (!ftrace_graph_count)
|
|
return 1;
|
|
|
|
for (i = 0; i < ftrace_graph_count; i++) {
|
|
if (addr == ftrace_graph_funcs[i]) {
|
|
/*
|
|
* If no irqs are to be traced, but a set_graph_function
|
|
* is set, and called by an interrupt handler, we still
|
|
* want to trace it.
|
|
*/
|
|
if (in_irq())
|
|
trace_recursion_set(TRACE_IRQ_BIT);
|
|
else
|
|
trace_recursion_clear(TRACE_IRQ_BIT);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int ftrace_graph_notrace_addr(unsigned long addr)
|
|
{
|
|
int i;
|
|
|
|
if (!ftrace_graph_notrace_count)
|
|
return 0;
|
|
|
|
for (i = 0; i < ftrace_graph_notrace_count; i++) {
|
|
if (addr == ftrace_graph_notrace_funcs[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int ftrace_graph_notrace_addr(unsigned long addr)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
|
|
extern unsigned int fgraph_max_depth;
|
|
|
|
static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
|
|
{
|
|
/* trace it when it is-nested-in or is a function enabled. */
|
|
return !(trace->depth || ftrace_graph_addr(trace->func)) ||
|
|
(trace->depth < 0) ||
|
|
(fgraph_max_depth && trace->depth >= fgraph_max_depth);
|
|
}
|
|
|
|
#else /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
static inline enum print_line_t
|
|
print_graph_function_flags(struct trace_iterator *iter, u32 flags)
|
|
{
|
|
return TRACE_TYPE_UNHANDLED;
|
|
}
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
extern struct list_head ftrace_pids;
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
extern bool ftrace_filter_param __initdata;
|
|
static inline int ftrace_trace_task(struct trace_array *tr)
|
|
{
|
|
return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
|
|
}
|
|
extern int ftrace_is_dead(void);
|
|
int ftrace_create_function_files(struct trace_array *tr,
|
|
struct dentry *parent);
|
|
void ftrace_destroy_function_files(struct trace_array *tr);
|
|
void ftrace_init_global_array_ops(struct trace_array *tr);
|
|
void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
|
|
void ftrace_reset_array_ops(struct trace_array *tr);
|
|
int using_ftrace_ops_list_func(void);
|
|
void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
|
|
void ftrace_init_tracefs_toplevel(struct trace_array *tr,
|
|
struct dentry *d_tracer);
|
|
#else
|
|
static inline int ftrace_trace_task(struct trace_array *tr)
|
|
{
|
|
return 1;
|
|
}
|
|
static inline int ftrace_is_dead(void) { return 0; }
|
|
static inline int
|
|
ftrace_create_function_files(struct trace_array *tr,
|
|
struct dentry *parent)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
|
|
static inline __init void
|
|
ftrace_init_global_array_ops(struct trace_array *tr) { }
|
|
static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
|
|
static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
|
|
static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
|
|
/* ftace_func_t type is not defined, use macro instead of static inline */
|
|
#define ftrace_init_array_ops(tr, func) do { } while (0)
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
|
|
void ftrace_create_filter_files(struct ftrace_ops *ops,
|
|
struct dentry *parent);
|
|
void ftrace_destroy_filter_files(struct ftrace_ops *ops);
|
|
#else
|
|
/*
|
|
* The ops parameter passed in is usually undefined.
|
|
* This must be a macro.
|
|
*/
|
|
#define ftrace_create_filter_files(ops, parent) do { } while (0)
|
|
#define ftrace_destroy_filter_files(ops) do { } while (0)
|
|
#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
|
|
|
|
bool ftrace_event_is_function(struct trace_event_call *call);
|
|
|
|
/*
|
|
* struct trace_parser - servers for reading the user input separated by spaces
|
|
* @cont: set if the input is not complete - no final space char was found
|
|
* @buffer: holds the parsed user input
|
|
* @idx: user input length
|
|
* @size: buffer size
|
|
*/
|
|
struct trace_parser {
|
|
bool cont;
|
|
char *buffer;
|
|
unsigned idx;
|
|
unsigned size;
|
|
};
|
|
|
|
static inline bool trace_parser_loaded(struct trace_parser *parser)
|
|
{
|
|
return (parser->idx != 0);
|
|
}
|
|
|
|
static inline bool trace_parser_cont(struct trace_parser *parser)
|
|
{
|
|
return parser->cont;
|
|
}
|
|
|
|
static inline void trace_parser_clear(struct trace_parser *parser)
|
|
{
|
|
parser->cont = false;
|
|
parser->idx = 0;
|
|
}
|
|
|
|
extern int trace_parser_get_init(struct trace_parser *parser, int size);
|
|
extern void trace_parser_put(struct trace_parser *parser);
|
|
extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
|
|
size_t cnt, loff_t *ppos);
|
|
|
|
/*
|
|
* Only create function graph options if function graph is configured.
|
|
*/
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
# define FGRAPH_FLAGS \
|
|
C(DISPLAY_GRAPH, "display-graph"),
|
|
#else
|
|
# define FGRAPH_FLAGS
|
|
#endif
|
|
|
|
#ifdef CONFIG_BRANCH_TRACER
|
|
# define BRANCH_FLAGS \
|
|
C(BRANCH, "branch"),
|
|
#else
|
|
# define BRANCH_FLAGS
|
|
#endif
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
# define FUNCTION_FLAGS \
|
|
C(FUNCTION, "function-trace"),
|
|
# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
|
|
#else
|
|
# define FUNCTION_FLAGS
|
|
# define FUNCTION_DEFAULT_FLAGS 0UL
|
|
#endif
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
# define STACK_FLAGS \
|
|
C(STACKTRACE, "stacktrace"),
|
|
#else
|
|
# define STACK_FLAGS
|
|
#endif
|
|
|
|
/*
|
|
* trace_iterator_flags is an enumeration that defines bit
|
|
* positions into trace_flags that controls the output.
|
|
*
|
|
* NOTE: These bits must match the trace_options array in
|
|
* trace.c (this macro guarantees it).
|
|
*/
|
|
#define TRACE_FLAGS \
|
|
C(PRINT_PARENT, "print-parent"), \
|
|
C(SYM_OFFSET, "sym-offset"), \
|
|
C(SYM_ADDR, "sym-addr"), \
|
|
C(VERBOSE, "verbose"), \
|
|
C(RAW, "raw"), \
|
|
C(HEX, "hex"), \
|
|
C(BIN, "bin"), \
|
|
C(BLOCK, "block"), \
|
|
C(PRINTK, "trace_printk"), \
|
|
C(ANNOTATE, "annotate"), \
|
|
C(USERSTACKTRACE, "userstacktrace"), \
|
|
C(SYM_USEROBJ, "sym-userobj"), \
|
|
C(PRINTK_MSGONLY, "printk-msg-only"), \
|
|
C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
|
|
C(LATENCY_FMT, "latency-format"), \
|
|
C(RECORD_CMD, "record-cmd"), \
|
|
C(OVERWRITE, "overwrite"), \
|
|
C(STOP_ON_FREE, "disable_on_free"), \
|
|
C(IRQ_INFO, "irq-info"), \
|
|
C(MARKERS, "markers"), \
|
|
C(EVENT_FORK, "event-fork"), \
|
|
FUNCTION_FLAGS \
|
|
FGRAPH_FLAGS \
|
|
STACK_FLAGS \
|
|
BRANCH_FLAGS
|
|
|
|
/*
|
|
* By defining C, we can make TRACE_FLAGS a list of bit names
|
|
* that will define the bits for the flag masks.
|
|
*/
|
|
#undef C
|
|
#define C(a, b) TRACE_ITER_##a##_BIT
|
|
|
|
enum trace_iterator_bits {
|
|
TRACE_FLAGS
|
|
/* Make sure we don't go more than we have bits for */
|
|
TRACE_ITER_LAST_BIT
|
|
};
|
|
|
|
/*
|
|
* By redefining C, we can make TRACE_FLAGS a list of masks that
|
|
* use the bits as defined above.
|
|
*/
|
|
#undef C
|
|
#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
|
|
|
|
enum trace_iterator_flags { TRACE_FLAGS };
|
|
|
|
/*
|
|
* TRACE_ITER_SYM_MASK masks the options in trace_flags that
|
|
* control the output of kernel symbols.
|
|
*/
|
|
#define TRACE_ITER_SYM_MASK \
|
|
(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
|
|
|
|
extern struct tracer nop_trace;
|
|
|
|
#ifdef CONFIG_BRANCH_TRACER
|
|
extern int enable_branch_tracing(struct trace_array *tr);
|
|
extern void disable_branch_tracing(void);
|
|
static inline int trace_branch_enable(struct trace_array *tr)
|
|
{
|
|
if (tr->trace_flags & TRACE_ITER_BRANCH)
|
|
return enable_branch_tracing(tr);
|
|
return 0;
|
|
}
|
|
static inline void trace_branch_disable(void)
|
|
{
|
|
/* due to races, always disable */
|
|
disable_branch_tracing();
|
|
}
|
|
#else
|
|
static inline int trace_branch_enable(struct trace_array *tr)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void trace_branch_disable(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_BRANCH_TRACER */
|
|
|
|
/* set ring buffers to default size if not already done so */
|
|
int tracing_update_buffers(void);
|
|
|
|
struct ftrace_event_field {
|
|
struct list_head link;
|
|
const char *name;
|
|
const char *type;
|
|
int filter_type;
|
|
int offset;
|
|
int size;
|
|
int is_signed;
|
|
};
|
|
|
|
struct event_filter {
|
|
int n_preds; /* Number assigned */
|
|
int a_preds; /* allocated */
|
|
struct filter_pred *preds;
|
|
struct filter_pred *root;
|
|
char *filter_string;
|
|
};
|
|
|
|
struct event_subsystem {
|
|
struct list_head list;
|
|
const char *name;
|
|
struct event_filter *filter;
|
|
int ref_count;
|
|
};
|
|
|
|
struct trace_subsystem_dir {
|
|
struct list_head list;
|
|
struct event_subsystem *subsystem;
|
|
struct trace_array *tr;
|
|
struct dentry *entry;
|
|
int ref_count;
|
|
int nr_events;
|
|
};
|
|
|
|
extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
|
|
void trace_buffer_unlock_commit_regs(struct trace_array *tr,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
unsigned long flags, int pc,
|
|
struct pt_regs *regs);
|
|
|
|
static inline void trace_buffer_unlock_commit(struct trace_array *tr,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
unsigned long flags, int pc)
|
|
{
|
|
trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
|
|
}
|
|
|
|
DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
|
|
DECLARE_PER_CPU(int, trace_buffered_event_cnt);
|
|
void trace_buffered_event_disable(void);
|
|
void trace_buffered_event_enable(void);
|
|
|
|
static inline void
|
|
__trace_event_discard_commit(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
if (this_cpu_read(trace_buffered_event) == event) {
|
|
/* Simply release the temp buffer */
|
|
this_cpu_dec(trace_buffered_event_cnt);
|
|
return;
|
|
}
|
|
ring_buffer_discard_commit(buffer, event);
|
|
}
|
|
|
|
/*
|
|
* Helper function for event_trigger_unlock_commit{_regs}().
|
|
* If there are event triggers attached to this event that requires
|
|
* filtering against its fields, then they wil be called as the
|
|
* entry already holds the field information of the current event.
|
|
*
|
|
* It also checks if the event should be discarded or not.
|
|
* It is to be discarded if the event is soft disabled and the
|
|
* event was only recorded to process triggers, or if the event
|
|
* filter is active and this event did not match the filters.
|
|
*
|
|
* Returns true if the event is discarded, false otherwise.
|
|
*/
|
|
static inline bool
|
|
__event_trigger_test_discard(struct trace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry,
|
|
enum event_trigger_type *tt)
|
|
{
|
|
unsigned long eflags = file->flags;
|
|
|
|
if (eflags & EVENT_FILE_FL_TRIGGER_COND)
|
|
*tt = event_triggers_call(file, entry);
|
|
|
|
if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
|
|
(unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
|
|
!filter_match_preds(file->filter, entry))) {
|
|
__trace_event_discard_commit(buffer, event);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit(struct trace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt, entry);
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit_regs - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*
|
|
* Same as event_trigger_unlock_commit() but calls
|
|
* trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit_regs(struct trace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc,
|
|
struct pt_regs *regs)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit_regs(file->tr, buffer, event,
|
|
irq_flags, pc, regs);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt, entry);
|
|
}
|
|
|
|
#define FILTER_PRED_INVALID ((unsigned short)-1)
|
|
#define FILTER_PRED_IS_RIGHT (1 << 15)
|
|
#define FILTER_PRED_FOLD (1 << 15)
|
|
|
|
/*
|
|
* The max preds is the size of unsigned short with
|
|
* two flags at the MSBs. One bit is used for both the IS_RIGHT
|
|
* and FOLD flags. The other is reserved.
|
|
*
|
|
* 2^14 preds is way more than enough.
|
|
*/
|
|
#define MAX_FILTER_PRED 16384
|
|
|
|
struct filter_pred;
|
|
struct regex;
|
|
|
|
typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
|
|
|
|
typedef int (*regex_match_func)(char *str, struct regex *r, int len);
|
|
|
|
enum regex_type {
|
|
MATCH_FULL = 0,
|
|
MATCH_FRONT_ONLY,
|
|
MATCH_MIDDLE_ONLY,
|
|
MATCH_END_ONLY,
|
|
MATCH_GLOB,
|
|
};
|
|
|
|
struct regex {
|
|
char pattern[MAX_FILTER_STR_VAL];
|
|
int len;
|
|
int field_len;
|
|
regex_match_func match;
|
|
};
|
|
|
|
struct filter_pred {
|
|
filter_pred_fn_t fn;
|
|
u64 val;
|
|
struct regex regex;
|
|
unsigned short *ops;
|
|
struct ftrace_event_field *field;
|
|
int offset;
|
|
int not;
|
|
int op;
|
|
unsigned short index;
|
|
unsigned short parent;
|
|
unsigned short left;
|
|
unsigned short right;
|
|
};
|
|
|
|
static inline bool is_string_field(struct ftrace_event_field *field)
|
|
{
|
|
return field->filter_type == FILTER_DYN_STRING ||
|
|
field->filter_type == FILTER_STATIC_STRING ||
|
|
field->filter_type == FILTER_PTR_STRING;
|
|
}
|
|
|
|
static inline bool is_function_field(struct ftrace_event_field *field)
|
|
{
|
|
return field->filter_type == FILTER_TRACE_FN;
|
|
}
|
|
|
|
extern enum regex_type
|
|
filter_parse_regex(char *buff, int len, char **search, int *not);
|
|
extern void print_event_filter(struct trace_event_file *file,
|
|
struct trace_seq *s);
|
|
extern int apply_event_filter(struct trace_event_file *file,
|
|
char *filter_string);
|
|
extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
|
|
char *filter_string);
|
|
extern void print_subsystem_event_filter(struct event_subsystem *system,
|
|
struct trace_seq *s);
|
|
extern int filter_assign_type(const char *type);
|
|
extern int create_event_filter(struct trace_event_call *call,
|
|
char *filter_str, bool set_str,
|
|
struct event_filter **filterp);
|
|
extern void free_event_filter(struct event_filter *filter);
|
|
|
|
struct ftrace_event_field *
|
|
trace_find_event_field(struct trace_event_call *call, char *name);
|
|
|
|
extern void trace_event_enable_cmd_record(bool enable);
|
|
extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
|
|
extern int event_trace_del_tracer(struct trace_array *tr);
|
|
|
|
extern struct trace_event_file *find_event_file(struct trace_array *tr,
|
|
const char *system,
|
|
const char *event);
|
|
|
|
static inline void *event_file_data(struct file *filp)
|
|
{
|
|
return ACCESS_ONCE(file_inode(filp)->i_private);
|
|
}
|
|
|
|
extern struct mutex event_mutex;
|
|
extern struct list_head ftrace_events;
|
|
|
|
extern const struct file_operations event_trigger_fops;
|
|
extern const struct file_operations event_hist_fops;
|
|
|
|
#ifdef CONFIG_HIST_TRIGGERS
|
|
extern int register_trigger_hist_cmd(void);
|
|
extern int register_trigger_hist_enable_disable_cmds(void);
|
|
#else
|
|
static inline int register_trigger_hist_cmd(void) { return 0; }
|
|
static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
|
|
#endif
|
|
|
|
extern int register_trigger_cmds(void);
|
|
extern void clear_event_triggers(struct trace_array *tr);
|
|
|
|
struct event_trigger_data {
|
|
unsigned long count;
|
|
int ref;
|
|
struct event_trigger_ops *ops;
|
|
struct event_command *cmd_ops;
|
|
struct event_filter __rcu *filter;
|
|
char *filter_str;
|
|
void *private_data;
|
|
bool paused;
|
|
bool paused_tmp;
|
|
struct list_head list;
|
|
char *name;
|
|
struct list_head named_list;
|
|
struct event_trigger_data *named_data;
|
|
};
|
|
|
|
/* Avoid typos */
|
|
#define ENABLE_EVENT_STR "enable_event"
|
|
#define DISABLE_EVENT_STR "disable_event"
|
|
#define ENABLE_HIST_STR "enable_hist"
|
|
#define DISABLE_HIST_STR "disable_hist"
|
|
|
|
struct enable_trigger_data {
|
|
struct trace_event_file *file;
|
|
bool enable;
|
|
bool hist;
|
|
};
|
|
|
|
extern int event_enable_trigger_print(struct seq_file *m,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
extern void event_enable_trigger_free(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
extern int event_enable_trigger_func(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob, char *cmd, char *param);
|
|
extern int event_enable_register_trigger(char *glob,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file);
|
|
extern void event_enable_unregister_trigger(char *glob,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *test,
|
|
struct trace_event_file *file);
|
|
extern void trigger_data_free(struct event_trigger_data *data);
|
|
extern int event_trigger_init(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
|
|
int trigger_enable);
|
|
extern void update_cond_flag(struct trace_event_file *file);
|
|
extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *test,
|
|
struct trace_event_file *file);
|
|
extern int set_trigger_filter(char *filter_str,
|
|
struct event_trigger_data *trigger_data,
|
|
struct trace_event_file *file);
|
|
extern struct event_trigger_data *find_named_trigger(const char *name);
|
|
extern bool is_named_trigger(struct event_trigger_data *test);
|
|
extern int save_named_trigger(const char *name,
|
|
struct event_trigger_data *data);
|
|
extern void del_named_trigger(struct event_trigger_data *data);
|
|
extern void pause_named_trigger(struct event_trigger_data *data);
|
|
extern void unpause_named_trigger(struct event_trigger_data *data);
|
|
extern void set_named_trigger_data(struct event_trigger_data *data,
|
|
struct event_trigger_data *named_data);
|
|
extern int register_event_command(struct event_command *cmd);
|
|
extern int unregister_event_command(struct event_command *cmd);
|
|
extern int register_trigger_hist_enable_disable_cmds(void);
|
|
|
|
/**
|
|
* struct event_trigger_ops - callbacks for trace event triggers
|
|
*
|
|
* The methods in this structure provide per-event trigger hooks for
|
|
* various trigger operations.
|
|
*
|
|
* All the methods below, except for @init() and @free(), must be
|
|
* implemented.
|
|
*
|
|
* @func: The trigger 'probe' function called when the triggering
|
|
* event occurs. The data passed into this callback is the data
|
|
* that was supplied to the event_command @reg() function that
|
|
* registered the trigger (see struct event_command) along with
|
|
* the trace record, rec.
|
|
*
|
|
* @init: An optional initialization function called for the trigger
|
|
* when the trigger is registered (via the event_command reg()
|
|
* function). This can be used to perform per-trigger
|
|
* initialization such as incrementing a per-trigger reference
|
|
* count, for instance. This is usually implemented by the
|
|
* generic utility function @event_trigger_init() (see
|
|
* trace_event_triggers.c).
|
|
*
|
|
* @free: An optional de-initialization function called for the
|
|
* trigger when the trigger is unregistered (via the
|
|
* event_command @reg() function). This can be used to perform
|
|
* per-trigger de-initialization such as decrementing a
|
|
* per-trigger reference count and freeing corresponding trigger
|
|
* data, for instance. This is usually implemented by the
|
|
* generic utility function @event_trigger_free() (see
|
|
* trace_event_triggers.c).
|
|
*
|
|
* @print: The callback function invoked to have the trigger print
|
|
* itself. This is usually implemented by a wrapper function
|
|
* that calls the generic utility function @event_trigger_print()
|
|
* (see trace_event_triggers.c).
|
|
*/
|
|
struct event_trigger_ops {
|
|
void (*func)(struct event_trigger_data *data,
|
|
void *rec);
|
|
int (*init)(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
void (*free)(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
int (*print)(struct seq_file *m,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data);
|
|
};
|
|
|
|
/**
|
|
* struct event_command - callbacks and data members for event commands
|
|
*
|
|
* Event commands are invoked by users by writing the command name
|
|
* into the 'trigger' file associated with a trace event. The
|
|
* parameters associated with a specific invocation of an event
|
|
* command are used to create an event trigger instance, which is
|
|
* added to the list of trigger instances associated with that trace
|
|
* event. When the event is hit, the set of triggers associated with
|
|
* that event is invoked.
|
|
*
|
|
* The data members in this structure provide per-event command data
|
|
* for various event commands.
|
|
*
|
|
* All the data members below, except for @post_trigger, must be set
|
|
* for each event command.
|
|
*
|
|
* @name: The unique name that identifies the event command. This is
|
|
* the name used when setting triggers via trigger files.
|
|
*
|
|
* @trigger_type: A unique id that identifies the event command
|
|
* 'type'. This value has two purposes, the first to ensure that
|
|
* only one trigger of the same type can be set at a given time
|
|
* for a particular event e.g. it doesn't make sense to have both
|
|
* a traceon and traceoff trigger attached to a single event at
|
|
* the same time, so traceon and traceoff have the same type
|
|
* though they have different names. The @trigger_type value is
|
|
* also used as a bit value for deferring the actual trigger
|
|
* action until after the current event is finished. Some
|
|
* commands need to do this if they themselves log to the trace
|
|
* buffer (see the @post_trigger() member below). @trigger_type
|
|
* values are defined by adding new values to the trigger_type
|
|
* enum in include/linux/trace_events.h.
|
|
*
|
|
* @flags: See the enum event_command_flags below.
|
|
*
|
|
* All the methods below, except for @set_filter() and @unreg_all(),
|
|
* must be implemented.
|
|
*
|
|
* @func: The callback function responsible for parsing and
|
|
* registering the trigger written to the 'trigger' file by the
|
|
* user. It allocates the trigger instance and registers it with
|
|
* the appropriate trace event. It makes use of the other
|
|
* event_command callback functions to orchestrate this, and is
|
|
* usually implemented by the generic utility function
|
|
* @event_trigger_callback() (see trace_event_triggers.c).
|
|
*
|
|
* @reg: Adds the trigger to the list of triggers associated with the
|
|
* event, and enables the event trigger itself, after
|
|
* initializing it (via the event_trigger_ops @init() function).
|
|
* This is also where commands can use the @trigger_type value to
|
|
* make the decision as to whether or not multiple instances of
|
|
* the trigger should be allowed. This is usually implemented by
|
|
* the generic utility function @register_trigger() (see
|
|
* trace_event_triggers.c).
|
|
*
|
|
* @unreg: Removes the trigger from the list of triggers associated
|
|
* with the event, and disables the event trigger itself, after
|
|
* initializing it (via the event_trigger_ops @free() function).
|
|
* This is usually implemented by the generic utility function
|
|
* @unregister_trigger() (see trace_event_triggers.c).
|
|
*
|
|
* @unreg_all: An optional function called to remove all the triggers
|
|
* from the list of triggers associated with the event. Called
|
|
* when a trigger file is opened in truncate mode.
|
|
*
|
|
* @set_filter: An optional function called to parse and set a filter
|
|
* for the trigger. If no @set_filter() method is set for the
|
|
* event command, filters set by the user for the command will be
|
|
* ignored. This is usually implemented by the generic utility
|
|
* function @set_trigger_filter() (see trace_event_triggers.c).
|
|
*
|
|
* @get_trigger_ops: The callback function invoked to retrieve the
|
|
* event_trigger_ops implementation associated with the command.
|
|
*/
|
|
struct event_command {
|
|
struct list_head list;
|
|
char *name;
|
|
enum event_trigger_type trigger_type;
|
|
int flags;
|
|
int (*func)(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob, char *cmd, char *params);
|
|
int (*reg)(char *glob,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file);
|
|
void (*unreg)(char *glob,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file);
|
|
void (*unreg_all)(struct trace_event_file *file);
|
|
int (*set_filter)(char *filter_str,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file);
|
|
struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
|
|
};
|
|
|
|
/**
|
|
* enum event_command_flags - flags for struct event_command
|
|
*
|
|
* @POST_TRIGGER: A flag that says whether or not this command needs
|
|
* to have its action delayed until after the current event has
|
|
* been closed. Some triggers need to avoid being invoked while
|
|
* an event is currently in the process of being logged, since
|
|
* the trigger may itself log data into the trace buffer. Thus
|
|
* we make sure the current event is committed before invoking
|
|
* those triggers. To do that, the trigger invocation is split
|
|
* in two - the first part checks the filter using the current
|
|
* trace record; if a command has the @post_trigger flag set, it
|
|
* sets a bit for itself in the return value, otherwise it
|
|
* directly invokes the trigger. Once all commands have been
|
|
* either invoked or set their return flag, the current record is
|
|
* either committed or discarded. At that point, if any commands
|
|
* have deferred their triggers, those commands are finally
|
|
* invoked following the close of the current event. In other
|
|
* words, if the event_trigger_ops @func() probe implementation
|
|
* itself logs to the trace buffer, this flag should be set,
|
|
* otherwise it can be left unspecified.
|
|
*
|
|
* @NEEDS_REC: A flag that says whether or not this command needs
|
|
* access to the trace record in order to perform its function,
|
|
* regardless of whether or not it has a filter associated with
|
|
* it (filters make a trigger require access to the trace record
|
|
* but are not always present).
|
|
*/
|
|
enum event_command_flags {
|
|
EVENT_CMD_FL_POST_TRIGGER = 1,
|
|
EVENT_CMD_FL_NEEDS_REC = 2,
|
|
};
|
|
|
|
static inline bool event_command_post_trigger(struct event_command *cmd_ops)
|
|
{
|
|
return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
|
|
}
|
|
|
|
static inline bool event_command_needs_rec(struct event_command *cmd_ops)
|
|
{
|
|
return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
|
|
}
|
|
|
|
extern int trace_event_enable_disable(struct trace_event_file *file,
|
|
int enable, int soft_disable);
|
|
extern int tracing_alloc_snapshot(void);
|
|
|
|
extern const char *__start___trace_bprintk_fmt[];
|
|
extern const char *__stop___trace_bprintk_fmt[];
|
|
|
|
extern const char *__start___tracepoint_str[];
|
|
extern const char *__stop___tracepoint_str[];
|
|
|
|
void trace_printk_control(bool enabled);
|
|
void trace_printk_init_buffers(void);
|
|
void trace_printk_start_comm(void);
|
|
int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
|
|
int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
|
|
|
|
/*
|
|
* Normal trace_printk() and friends allocates special buffers
|
|
* to do the manipulation, as well as saves the print formats
|
|
* into sections to display. But the trace infrastructure wants
|
|
* to use these without the added overhead at the price of being
|
|
* a bit slower (used mainly for warnings, where we don't care
|
|
* about performance). The internal_trace_puts() is for such
|
|
* a purpose.
|
|
*/
|
|
#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
|
|
|
|
#undef FTRACE_ENTRY
|
|
#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
|
|
extern struct trace_event_call \
|
|
__aligned(4) event_##call;
|
|
#undef FTRACE_ENTRY_DUP
|
|
#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
|
|
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
|
|
filter)
|
|
#undef FTRACE_ENTRY_PACKED
|
|
#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
|
|
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
|
|
filter)
|
|
|
|
#include "trace_entries.h"
|
|
|
|
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
|
|
int perf_ftrace_event_register(struct trace_event_call *call,
|
|
enum trace_reg type, void *data);
|
|
#else
|
|
#define perf_ftrace_event_register NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_FTRACE_SYSCALLS
|
|
void init_ftrace_syscalls(void);
|
|
const char *get_syscall_name(int syscall);
|
|
#else
|
|
static inline void init_ftrace_syscalls(void) { }
|
|
static inline const char *get_syscall_name(int syscall)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_EVENT_TRACING
|
|
void trace_event_init(void);
|
|
void trace_event_enum_update(struct trace_enum_map **map, int len);
|
|
#else
|
|
static inline void __init trace_event_init(void) { }
|
|
static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
|
|
#endif
|
|
|
|
extern struct trace_iterator *tracepoint_print_iter;
|
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|