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c72bb31691
were added to 3.10, which includes several bug fixes that have been marked for stable. As for new features, there were a few, but nothing to write to LWN about. These include: New function trigger called "dump" and "cpudump" that will cause ftrace to dump its buffer to the console when the function is called. The difference between "dump" and "cpudump" is that "dump" will dump the entire contents of the ftrace buffer, where as "cpudump" will only dump the contents of the ftrace buffer for the CPU that called the function. Another small enhancement is a new sysctl switch called "traceoff_on_warning" which, when enabled, will disable tracing if any WARN_ON() is triggered. This is useful if you want to debug what caused a warning and do not want to risk losing your trace data by the ring buffer overwriting the data before you can disable it. There's also a kernel command line option that will make this enabled at boot up called the same thing. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJR1uF2AAoJEOdOSU1xswtMJ1IH/2LSiZAKTA2QaRgGQC/5Bb9c XSOI1HfD/78lmUvTyb0AX8sLpkzZlvIONEQ/WaZUFo1Zjbrl45zJUwMkTE9uImEg ZqI5x8OiiN6j4XrRbfYn3Ti060H/Jq41pZXa+shh961Vv51ilv/1yyLkoRmnjzuO JTloPdXDV7icOqqiSdgxSdtUSv59Ef1ZdHgvvsb3aqzMC5btVQPi4kIys0ST1Tr1 pMWBY+UgvH0xYm3gvTR+W6jjDlkVZEH2alkmcinfr+uC1tm9DDqK2HA17Pd5yZ5z HNdT76lCzf9iqRF5F8HUvUt+PIp76dNNxAt2qpB6APqAuJTojyguxXHDbY/0kzs= =UvLi -----END PGP SIGNATURE----- Merge tag 'trace-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing changes from Steven Rostedt: "The majority of the changes here are cleanups for the large changes that were added to 3.10, which includes several bug fixes that have been marked for stable. As for new features, there were a few, but nothing to write to LWN about. These include: New function trigger called "dump" and "cpudump" that will cause ftrace to dump its buffer to the console when the function is called. The difference between "dump" and "cpudump" is that "dump" will dump the entire contents of the ftrace buffer, where as "cpudump" will only dump the contents of the ftrace buffer for the CPU that called the function. Another small enhancement is a new sysctl switch called "traceoff_on_warning" which, when enabled, will disable tracing if any WARN_ON() is triggered. This is useful if you want to debug what caused a warning and do not want to risk losing your trace data by the ring buffer overwriting the data before you can disable it. There's also a kernel command line option that will make this enabled at boot up called the same thing" * tag 'trace-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (34 commits) tracing: Make tracing_open_generic_{tr,tc}() static tracing: Remove ftrace() function tracing: Remove TRACE_EVENT_TYPE enum definition tracing: Make tracer_tracing_{off,on,is_on}() static tracing: Fix irqs-off tag display in syscall tracing uprobes: Fix return value in error handling path tracing: Fix race between deleting buffer and setting events tracing: Add trace_array_get/put() to event handling tracing: Get trace_array ref counts when accessing trace files tracing: Add trace_array_get/put() to handle instance refs better tracing: Protect ftrace_trace_arrays list in trace_events.c tracing: Make trace_marker use the correct per-instance buffer ftrace: Do not run selftest if command line parameter is set tracing/kprobes: Don't pass addr=ip to perf_trace_buf_submit() tracing: Use flag buffer_disabled for irqsoff tracer tracing/kprobes: Turn trace_probe->files into list_head tracing: Fix disabling of soft disable tracing: Add missing syscall_metadata comment tracing: Simplify code for showing of soft disabled flag tracing/kprobes: Kill probe_enable_lock ...
1059 lines
30 KiB
C
1059 lines
30 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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#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_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 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, 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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#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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struct trace_array;
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struct trace_cpu {
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struct trace_array *tr;
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struct dentry *dir;
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int cpu;
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};
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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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struct trace_cpu trace_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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};
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struct tracer;
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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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/*
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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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int buffer_disabled;
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struct trace_cpu trace_cpu; /* place holder */
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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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DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
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DECLARE_BITMAP(enabled_exit_syscalls, 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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struct tracer *current_trace;
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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 list_head systems;
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struct list_head events;
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struct task_struct *waiter;
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int ref;
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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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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 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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/* Return 0 if OK with change, else return non-zero */
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int (*flag_changed)(struct tracer *tracer,
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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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bool print_max;
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bool enabled;
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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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/* GLOBAL_BITs must be greater than FTRACE_BITs */
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TRACE_GLOBAL_BIT,
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TRACE_GLOBAL_NMI_BIT,
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TRACE_GLOBAL_IRQ_BIT,
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TRACE_GLOBAL_SIRQ_BIT,
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/* INTERNAL_BITs must be greater than GLOBAL_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_CONTROL_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)
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#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_GLOBAL_START TRACE_GLOBAL_BIT
|
|
#define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_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);
|
|
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_tr(struct trace_array *tr);
|
|
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 __buffer_unlock_commit(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 poll_wait_pipe(struct trace_iterator *iter);
|
|
|
|
void tracing_sched_switch_trace(struct trace_array *tr,
|
|
struct task_struct *prev,
|
|
struct task_struct *next,
|
|
unsigned long flags, int pc);
|
|
|
|
void tracing_sched_wakeup_trace(struct trace_array *tr,
|
|
struct task_struct *wakee,
|
|
struct task_struct *cur,
|
|
unsigned long flags, int pc);
|
|
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);
|
|
void tracing_sched_switch_assign_trace(struct trace_array *tr);
|
|
void tracing_stop_sched_switch_record(void);
|
|
void tracing_start_sched_switch_record(void);
|
|
int register_tracer(struct tracer *type);
|
|
int is_tracing_stopped(void);
|
|
|
|
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;
|
|
|
|
#ifdef CONFIG_TRACER_MAX_TRACE
|
|
extern unsigned long tracing_max_latency;
|
|
|
|
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_stack(struct ring_buffer *buffer, unsigned long flags,
|
|
int skip, int pc);
|
|
|
|
void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
|
|
int skip, int pc, struct pt_regs *regs);
|
|
|
|
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_stack(struct ring_buffer *buffer,
|
|
unsigned long flags, int skip, int pc)
|
|
{
|
|
}
|
|
|
|
static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
|
|
unsigned long flags, int skip,
|
|
int pc, struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
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[]);
|
|
|
|
#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;
|
|
DECLARE_PER_CPU(int, ftrace_cpu_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);
|
|
#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 unsigned long trace_flags;
|
|
|
|
/* 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
|
|
|
|
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 enum print_line_t
|
|
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_filter_enabled;
|
|
extern int ftrace_graph_count;
|
|
extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
|
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
{
|
|
int i;
|
|
|
|
if (!ftrace_graph_filter_enabled)
|
|
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;
|
|
}
|
|
#else
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
#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 task_struct *task)
|
|
{
|
|
if (list_empty(&ftrace_pids))
|
|
return 1;
|
|
|
|
return test_tsk_trace_trace(task);
|
|
}
|
|
extern int ftrace_is_dead(void);
|
|
#else
|
|
static inline int ftrace_trace_task(struct task_struct *task)
|
|
{
|
|
return 1;
|
|
}
|
|
static inline int ftrace_is_dead(void) { return 0; }
|
|
#endif
|
|
|
|
int ftrace_event_is_function(struct ftrace_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);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
enum trace_iterator_flags {
|
|
TRACE_ITER_PRINT_PARENT = 0x01,
|
|
TRACE_ITER_SYM_OFFSET = 0x02,
|
|
TRACE_ITER_SYM_ADDR = 0x04,
|
|
TRACE_ITER_VERBOSE = 0x08,
|
|
TRACE_ITER_RAW = 0x10,
|
|
TRACE_ITER_HEX = 0x20,
|
|
TRACE_ITER_BIN = 0x40,
|
|
TRACE_ITER_BLOCK = 0x80,
|
|
TRACE_ITER_STACKTRACE = 0x100,
|
|
TRACE_ITER_PRINTK = 0x200,
|
|
TRACE_ITER_PREEMPTONLY = 0x400,
|
|
TRACE_ITER_BRANCH = 0x800,
|
|
TRACE_ITER_ANNOTATE = 0x1000,
|
|
TRACE_ITER_USERSTACKTRACE = 0x2000,
|
|
TRACE_ITER_SYM_USEROBJ = 0x4000,
|
|
TRACE_ITER_PRINTK_MSGONLY = 0x8000,
|
|
TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
|
|
TRACE_ITER_LATENCY_FMT = 0x20000,
|
|
TRACE_ITER_SLEEP_TIME = 0x40000,
|
|
TRACE_ITER_GRAPH_TIME = 0x80000,
|
|
TRACE_ITER_RECORD_CMD = 0x100000,
|
|
TRACE_ITER_OVERWRITE = 0x200000,
|
|
TRACE_ITER_STOP_ON_FREE = 0x400000,
|
|
TRACE_ITER_IRQ_INFO = 0x800000,
|
|
TRACE_ITER_MARKERS = 0x1000000,
|
|
TRACE_ITER_FUNCTION = 0x2000000,
|
|
};
|
|
|
|
/*
|
|
* 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 (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 ftrace_subsystem_dir {
|
|
struct list_head list;
|
|
struct event_subsystem *subsystem;
|
|
struct trace_array *tr;
|
|
struct dentry *entry;
|
|
int ref_count;
|
|
int nr_events;
|
|
};
|
|
|
|
#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;
|
|
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;
|
|
};
|
|
|
|
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 ftrace_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);
|
|
|
|
struct ftrace_event_field *
|
|
trace_find_event_field(struct ftrace_event_call *call, char *name);
|
|
|
|
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 int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
|
|
extern int event_trace_del_tracer(struct trace_array *tr);
|
|
|
|
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[];
|
|
|
|
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 ftrace_event_call \
|
|
__attribute__((__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)
|
|
#include "trace_entries.h"
|
|
|
|
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
|
|
int perf_ftrace_event_register(struct ftrace_event_call *call,
|
|
enum trace_reg type, void *data);
|
|
#else
|
|
#define perf_ftrace_event_register NULL
|
|
#endif
|
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|