832 lines
24 KiB
C
832 lines
24 KiB
C
#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/ftrace_event.h>
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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_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) \
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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 TP_ARGS
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#define TP_ARGS(args...) args
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#undef FTRACE_ENTRY_DUP
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#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
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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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};
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#define TRACE_BUF_SIZE 1024
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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 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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uid_t uid;
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char comm[TASK_COMM_LEN];
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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 ring_buffer *buffer;
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unsigned long entries;
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int cpu;
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cycle_t time_start;
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struct task_struct *waiter;
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struct trace_array_cpu *data[NR_CPUS];
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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 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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};
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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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/**
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* struct tracer - a specific tracer and its callbacks to interact with debugfs
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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_enabled)
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* @stop: called when tracing is paused (echo 0 > tracing_enabled)
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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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* @wait_pipe: override how the user waits for traces on trace_pipe
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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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void (*open)(struct trace_iterator *iter);
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void (*pipe_open)(struct trace_iterator *iter);
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void (*wait_pipe)(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)(u32 old_flags, u32 bit, int set);
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struct tracer *next;
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struct tracer_flags *flags;
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int print_max;
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int use_max_tr;
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};
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/* Only current can touch trace_recursion */
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#define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
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#define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
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/* Ring buffer has the 10 LSB bits to count */
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#define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
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/* for function tracing recursion */
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#define TRACE_INTERNAL_BIT (1<<11)
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#define TRACE_GLOBAL_BIT (1<<12)
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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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#define TRACE_IRQ_BIT (1<<13)
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#define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
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#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
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#define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
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#define TRACE_PIPE_ALL_CPU -1
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int tracer_init(struct tracer *t, struct trace_array *tr);
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int tracing_is_enabled(void);
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void trace_wake_up(void);
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void tracing_reset(struct trace_array *tr, int cpu);
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void tracing_reset_online_cpus(struct trace_array *tr);
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void tracing_reset_current(int cpu);
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void tracing_reset_current_online_cpus(void);
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int tracing_open_generic(struct inode *inode, struct file *filp);
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struct dentry *trace_create_file(const char *name,
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mode_t mode,
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struct dentry *parent,
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void *data,
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const struct file_operations *fops);
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struct dentry *tracing_init_dentry(void);
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struct ring_buffer_event;
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struct ring_buffer_event *
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trace_buffer_lock_reserve(struct ring_buffer *buffer,
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int type,
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unsigned long len,
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unsigned long flags,
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int pc);
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void trace_buffer_unlock_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event,
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unsigned long flags, int pc);
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struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
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struct trace_array_cpu *data);
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struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
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int *ent_cpu, u64 *ent_ts);
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int trace_empty(struct trace_iterator *iter);
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void *trace_find_next_entry_inc(struct trace_iterator *iter);
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void trace_init_global_iter(struct trace_iterator *iter);
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void tracing_iter_reset(struct trace_iterator *iter, int cpu);
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void default_wait_pipe(struct trace_iterator *iter);
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void poll_wait_pipe(struct trace_iterator *iter);
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void ftrace(struct trace_array *tr,
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struct trace_array_cpu *data,
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unsigned long ip,
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unsigned long parent_ip,
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unsigned long flags, int pc);
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void tracing_sched_switch_trace(struct trace_array *tr,
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struct task_struct *prev,
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struct task_struct *next,
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unsigned long flags, int pc);
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void tracing_sched_wakeup_trace(struct trace_array *tr,
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struct task_struct *wakee,
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struct task_struct *cur,
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unsigned long flags, int pc);
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void trace_function(struct trace_array *tr,
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unsigned long ip,
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unsigned long parent_ip,
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unsigned long flags, int pc);
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void trace_graph_function(struct trace_array *tr,
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unsigned long ip,
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unsigned long parent_ip,
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unsigned long flags, int pc);
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void trace_default_header(struct seq_file *m);
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void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
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int trace_empty(struct trace_iterator *iter);
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void trace_graph_return(struct ftrace_graph_ret *trace);
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int trace_graph_entry(struct ftrace_graph_ent *trace);
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void set_graph_array(struct trace_array *tr);
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void tracing_start_cmdline_record(void);
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void tracing_stop_cmdline_record(void);
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void tracing_sched_switch_assign_trace(struct trace_array *tr);
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void tracing_stop_sched_switch_record(void);
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void tracing_start_sched_switch_record(void);
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int register_tracer(struct tracer *type);
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void unregister_tracer(struct tracer *type);
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int is_tracing_stopped(void);
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enum trace_file_type {
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TRACE_FILE_LAT_FMT = 1,
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TRACE_FILE_ANNOTATE = 2,
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};
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extern cpumask_var_t __read_mostly tracing_buffer_mask;
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#define for_each_tracing_cpu(cpu) \
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for_each_cpu(cpu, tracing_buffer_mask)
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extern unsigned long nsecs_to_usecs(unsigned long nsecs);
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extern unsigned long tracing_thresh;
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#ifdef CONFIG_TRACER_MAX_TRACE
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extern unsigned long tracing_max_latency;
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void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
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void update_max_tr_single(struct trace_array *tr,
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struct task_struct *tsk, int cpu);
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#endif /* CONFIG_TRACER_MAX_TRACE */
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#ifdef CONFIG_STACKTRACE
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void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
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int skip, int pc);
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void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
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int skip, int pc, struct pt_regs *regs);
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void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
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int pc);
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void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
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int pc);
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#else
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static inline void ftrace_trace_stack(struct ring_buffer *buffer,
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unsigned long flags, int skip, int pc)
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{
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}
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static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
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unsigned long flags, int skip,
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int pc, struct pt_regs *regs)
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{
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}
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static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
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unsigned long flags, int pc)
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{
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}
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static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
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int skip, int pc)
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{
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}
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#endif /* CONFIG_STACKTRACE */
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extern cycle_t ftrace_now(int cpu);
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extern void trace_find_cmdline(int pid, char comm[]);
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#ifdef CONFIG_DYNAMIC_FTRACE
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extern unsigned long ftrace_update_tot_cnt;
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#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
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extern int DYN_FTRACE_TEST_NAME(void);
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#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
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extern int DYN_FTRACE_TEST_NAME2(void);
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#endif
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extern int ring_buffer_expanded;
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extern bool tracing_selftest_disabled;
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DECLARE_PER_CPU(int, ftrace_cpu_disabled);
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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extern int trace_selftest_startup_function(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_function_graph(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_irqsoff(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_preemptoff(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_wakeup(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_nop(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_sched_switch(struct tracer *trace,
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struct trace_array *tr);
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extern int trace_selftest_startup_branch(struct tracer *trace,
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struct trace_array *tr);
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#endif /* CONFIG_FTRACE_STARTUP_TEST */
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extern void *head_page(struct trace_array_cpu *data);
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extern unsigned long long ns2usecs(cycle_t nsec);
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extern int
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trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
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extern int
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trace_vprintk(unsigned long ip, const char *fmt, va_list args);
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extern int
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trace_array_vprintk(struct trace_array *tr,
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unsigned long ip, const char *fmt, va_list args);
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int trace_array_printk(struct trace_array *tr,
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unsigned long ip, const char *fmt, ...);
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void trace_printk_seq(struct trace_seq *s);
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enum print_line_t print_trace_line(struct trace_iterator *iter);
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extern unsigned long trace_flags;
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extern int trace_clock_id;
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/* Standard output formatting function used for function return traces */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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/* Flag options */
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#define TRACE_GRAPH_PRINT_OVERRUN 0x1
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#define TRACE_GRAPH_PRINT_CPU 0x2
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#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
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#define TRACE_GRAPH_PRINT_PROC 0x8
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#define TRACE_GRAPH_PRINT_DURATION 0x10
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#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
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extern enum print_line_t
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print_graph_function_flags(struct trace_iterator *iter, u32 flags);
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extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
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extern enum print_line_t
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trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
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extern void graph_trace_open(struct trace_iterator *iter);
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extern void graph_trace_close(struct trace_iterator *iter);
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extern int __trace_graph_entry(struct trace_array *tr,
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struct ftrace_graph_ent *trace,
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unsigned long flags, int pc);
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extern void __trace_graph_return(struct trace_array *tr,
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struct ftrace_graph_ret *trace,
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unsigned long flags, int pc);
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#ifdef CONFIG_DYNAMIC_FTRACE
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/* TODO: make this variable */
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#define FTRACE_GRAPH_MAX_FUNCS 32
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extern int ftrace_graph_filter_enabled;
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extern int ftrace_graph_count;
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extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
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static inline int ftrace_graph_addr(unsigned long addr)
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{
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int i;
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if (!ftrace_graph_filter_enabled)
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return 1;
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for (i = 0; i < ftrace_graph_count; i++) {
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if (addr == ftrace_graph_funcs[i]) {
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/*
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* If no irqs are to be traced, but a set_graph_function
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* is set, and called by an interrupt handler, we still
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* want to trace it.
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*/
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if (in_irq())
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trace_recursion_set(TRACE_IRQ_BIT);
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else
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trace_recursion_clear(TRACE_IRQ_BIT);
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return 1;
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}
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}
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return 0;
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}
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#else
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static inline int ftrace_graph_addr(unsigned long addr)
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{
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return 1;
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}
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#else /* CONFIG_FUNCTION_GRAPH_TRACER */
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static inline enum print_line_t
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print_graph_function_flags(struct trace_iterator *iter, u32 flags)
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{
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return TRACE_TYPE_UNHANDLED;
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}
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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extern struct list_head ftrace_pids;
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#ifdef CONFIG_FUNCTION_TRACER
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static inline int ftrace_trace_task(struct task_struct *task)
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{
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if (list_empty(&ftrace_pids))
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return 1;
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|
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return test_tsk_trace_trace(task);
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}
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#else
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static inline int ftrace_trace_task(struct task_struct *task)
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{
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return 1;
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}
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#endif
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/*
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* struct trace_parser - servers for reading the user input separated by spaces
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* @cont: set if the input is not complete - no final space char was found
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* @buffer: holds the parsed user input
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* @idx: user input length
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* @size: buffer size
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*/
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struct trace_parser {
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bool cont;
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char *buffer;
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unsigned idx;
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unsigned size;
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};
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|
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static inline bool trace_parser_loaded(struct trace_parser *parser)
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|
{
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|
return (parser->idx != 0);
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|
}
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|
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static inline bool trace_parser_cont(struct trace_parser *parser)
|
|
{
|
|
return parser->cont;
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|
}
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|
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static inline void trace_parser_clear(struct trace_parser *parser)
|
|
{
|
|
parser->cont = false;
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|
parser->idx = 0;
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|
}
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|
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extern int trace_parser_get_init(struct trace_parser *parser, int size);
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|
extern void trace_parser_put(struct trace_parser *parser);
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|
extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
|
|
size_t cnt, loff_t *ppos);
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|
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/*
|
|
* trace_iterator_flags is an enumeration that defines bit
|
|
* positions into trace_flags that controls the output.
|
|
*
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|
* NOTE: These bits must match the trace_options array in
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|
* trace.c.
|
|
*/
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enum trace_iterator_flags {
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TRACE_ITER_PRINT_PARENT = 0x01,
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TRACE_ITER_SYM_OFFSET = 0x02,
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TRACE_ITER_SYM_ADDR = 0x04,
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|
TRACE_ITER_VERBOSE = 0x08,
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TRACE_ITER_RAW = 0x10,
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|
TRACE_ITER_HEX = 0x20,
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|
TRACE_ITER_BIN = 0x40,
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|
TRACE_ITER_BLOCK = 0x80,
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|
TRACE_ITER_STACKTRACE = 0x100,
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|
TRACE_ITER_PRINTK = 0x200,
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TRACE_ITER_PREEMPTONLY = 0x400,
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TRACE_ITER_BRANCH = 0x800,
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TRACE_ITER_ANNOTATE = 0x1000,
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TRACE_ITER_USERSTACKTRACE = 0x2000,
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TRACE_ITER_SYM_USEROBJ = 0x4000,
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TRACE_ITER_PRINTK_MSGONLY = 0x8000,
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TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
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TRACE_ITER_LATENCY_FMT = 0x20000,
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TRACE_ITER_SLEEP_TIME = 0x40000,
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|
TRACE_ITER_GRAPH_TIME = 0x80000,
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|
TRACE_ITER_RECORD_CMD = 0x100000,
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|
TRACE_ITER_OVERWRITE = 0x200000,
|
|
TRACE_ITER_STOP_ON_FREE = 0x400000,
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|
};
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|
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/*
|
|
* TRACE_ITER_SYM_MASK masks the options in trace_flags that
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|
* control the output of kernel symbols.
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|
*/
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|
#define TRACE_ITER_SYM_MASK \
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(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
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|
|
extern struct tracer nop_trace;
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|
|
#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 (trace_flags & TRACE_ITER_BRANCH)
|
|
return enable_branch_tracing(tr);
|
|
return 0;
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|
}
|
|
static inline void trace_branch_disable(void)
|
|
{
|
|
/* due to races, always disable */
|
|
disable_branch_tracing();
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|
}
|
|
#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);
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|
|
|
/* trace event type bit fields, not numeric */
|
|
enum {
|
|
TRACE_EVENT_TYPE_PRINTF = 1,
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|
TRACE_EVENT_TYPE_RAW = 2,
|
|
};
|
|
|
|
struct ftrace_event_field {
|
|
struct list_head link;
|
|
char *name;
|
|
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 dentry *entry;
|
|
struct event_filter *filter;
|
|
int nr_events;
|
|
int ref_count;
|
|
};
|
|
|
|
#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,
|
|
};
|
|
|
|
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;
|
|
/*
|
|
* Leaf nodes use field_name, ops is used by AND and OR
|
|
* nodes. The field_name is always freed when freeing a pred.
|
|
* We can overload field_name for ops and have it freed
|
|
* as well.
|
|
*/
|
|
union {
|
|
char *field_name;
|
|
unsigned short *ops;
|
|
};
|
|
int offset;
|
|
int not;
|
|
int op;
|
|
unsigned short index;
|
|
unsigned short parent;
|
|
unsigned short left;
|
|
unsigned short right;
|
|
};
|
|
|
|
extern struct list_head ftrace_common_fields;
|
|
|
|
extern enum regex_type
|
|
filter_parse_regex(char *buff, int len, char **search, int *not);
|
|
extern void print_event_filter(struct ftrace_event_call *call,
|
|
struct trace_seq *s);
|
|
extern int apply_event_filter(struct ftrace_event_call *call,
|
|
char *filter_string);
|
|
extern int apply_subsystem_event_filter(struct event_subsystem *system,
|
|
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);
|
|
|
|
struct list_head *
|
|
trace_get_fields(struct ftrace_event_call *event_call);
|
|
|
|
static inline int
|
|
filter_check_discard(struct ftrace_event_call *call, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event)
|
|
{
|
|
if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
|
|
!filter_match_preds(call->filter, rec)) {
|
|
ring_buffer_discard_commit(buffer, event);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
extern void trace_event_enable_cmd_record(bool enable);
|
|
|
|
extern struct mutex event_mutex;
|
|
extern struct list_head ftrace_events;
|
|
|
|
extern const char *__start___trace_bprintk_fmt[];
|
|
extern const char *__stop___trace_bprintk_fmt[];
|
|
|
|
#undef FTRACE_ENTRY
|
|
#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
|
|
extern struct ftrace_event_call \
|
|
__attribute__((__aligned__(4))) event_##call;
|
|
#undef FTRACE_ENTRY_DUP
|
|
#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
|
|
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
|
|
#include "trace_entries.h"
|
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|