![Li Zefan](/assets/img/avatar_default.png)
struct trace_entry->type is unsigned char, while trace event's id is int type, thus for a event with id >= 256, it's entry->type is cast to (id % 256), and then we can't see the trace output of this event. # insmod trace-events-sample.ko # echo foo_bar > /mnt/tracing/set_event # cat /debug/tracing/events/trace-events-sample/foo_bar/id 256 # cat /mnt/tracing/trace_pipe <...>-3548 [001] 215.091142: Unknown type 0 <...>-3548 [001] 216.089207: Unknown type 0 <...>-3548 [001] 217.087271: Unknown type 0 <...>-3548 [001] 218.085332: Unknown type 0 [ Impact: fix output for trace events with id >= 256 ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <49EEDB0E.5070207@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
798 lines
22 KiB
C
798 lines
22 KiB
C
#ifndef _LINUX_KERNEL_TRACE_H
|
|
#define _LINUX_KERNEL_TRACE_H
|
|
|
|
#include <linux/fs.h>
|
|
#include <asm/atomic.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/clocksource.h>
|
|
#include <linux/ring_buffer.h>
|
|
#include <linux/mmiotrace.h>
|
|
#include <linux/ftrace.h>
|
|
#include <trace/boot.h>
|
|
#include <linux/kmemtrace.h>
|
|
#include <trace/power.h>
|
|
|
|
#include <linux/trace_seq.h>
|
|
#include <linux/ftrace_event.h>
|
|
|
|
enum trace_type {
|
|
__TRACE_FIRST_TYPE = 0,
|
|
|
|
TRACE_FN,
|
|
TRACE_CTX,
|
|
TRACE_WAKE,
|
|
TRACE_STACK,
|
|
TRACE_PRINT,
|
|
TRACE_BPRINT,
|
|
TRACE_SPECIAL,
|
|
TRACE_MMIO_RW,
|
|
TRACE_MMIO_MAP,
|
|
TRACE_BRANCH,
|
|
TRACE_BOOT_CALL,
|
|
TRACE_BOOT_RET,
|
|
TRACE_GRAPH_RET,
|
|
TRACE_GRAPH_ENT,
|
|
TRACE_USER_STACK,
|
|
TRACE_HW_BRANCHES,
|
|
TRACE_SYSCALL_ENTER,
|
|
TRACE_SYSCALL_EXIT,
|
|
TRACE_KMEM_ALLOC,
|
|
TRACE_KMEM_FREE,
|
|
TRACE_POWER,
|
|
TRACE_BLK,
|
|
|
|
__TRACE_LAST_TYPE,
|
|
};
|
|
|
|
/*
|
|
* Function trace entry - function address and parent function addres:
|
|
*/
|
|
struct ftrace_entry {
|
|
struct trace_entry ent;
|
|
unsigned long ip;
|
|
unsigned long parent_ip;
|
|
};
|
|
|
|
/* Function call entry */
|
|
struct ftrace_graph_ent_entry {
|
|
struct trace_entry ent;
|
|
struct ftrace_graph_ent graph_ent;
|
|
};
|
|
|
|
/* Function return entry */
|
|
struct ftrace_graph_ret_entry {
|
|
struct trace_entry ent;
|
|
struct ftrace_graph_ret ret;
|
|
};
|
|
extern struct tracer boot_tracer;
|
|
|
|
/*
|
|
* Context switch trace entry - which task (and prio) we switched from/to:
|
|
*/
|
|
struct ctx_switch_entry {
|
|
struct trace_entry ent;
|
|
unsigned int prev_pid;
|
|
unsigned char prev_prio;
|
|
unsigned char prev_state;
|
|
unsigned int next_pid;
|
|
unsigned char next_prio;
|
|
unsigned char next_state;
|
|
unsigned int next_cpu;
|
|
};
|
|
|
|
/*
|
|
* Special (free-form) trace entry:
|
|
*/
|
|
struct special_entry {
|
|
struct trace_entry ent;
|
|
unsigned long arg1;
|
|
unsigned long arg2;
|
|
unsigned long arg3;
|
|
};
|
|
|
|
/*
|
|
* Stack-trace entry:
|
|
*/
|
|
|
|
#define FTRACE_STACK_ENTRIES 8
|
|
|
|
struct stack_entry {
|
|
struct trace_entry ent;
|
|
unsigned long caller[FTRACE_STACK_ENTRIES];
|
|
};
|
|
|
|
struct userstack_entry {
|
|
struct trace_entry ent;
|
|
unsigned long caller[FTRACE_STACK_ENTRIES];
|
|
};
|
|
|
|
/*
|
|
* trace_printk entry:
|
|
*/
|
|
struct bprint_entry {
|
|
struct trace_entry ent;
|
|
unsigned long ip;
|
|
const char *fmt;
|
|
u32 buf[];
|
|
};
|
|
|
|
struct print_entry {
|
|
struct trace_entry ent;
|
|
unsigned long ip;
|
|
char buf[];
|
|
};
|
|
|
|
#define TRACE_OLD_SIZE 88
|
|
|
|
struct trace_field_cont {
|
|
unsigned char type;
|
|
/* Temporary till we get rid of this completely */
|
|
char buf[TRACE_OLD_SIZE - 1];
|
|
};
|
|
|
|
struct trace_mmiotrace_rw {
|
|
struct trace_entry ent;
|
|
struct mmiotrace_rw rw;
|
|
};
|
|
|
|
struct trace_mmiotrace_map {
|
|
struct trace_entry ent;
|
|
struct mmiotrace_map map;
|
|
};
|
|
|
|
struct trace_boot_call {
|
|
struct trace_entry ent;
|
|
struct boot_trace_call boot_call;
|
|
};
|
|
|
|
struct trace_boot_ret {
|
|
struct trace_entry ent;
|
|
struct boot_trace_ret boot_ret;
|
|
};
|
|
|
|
#define TRACE_FUNC_SIZE 30
|
|
#define TRACE_FILE_SIZE 20
|
|
struct trace_branch {
|
|
struct trace_entry ent;
|
|
unsigned line;
|
|
char func[TRACE_FUNC_SIZE+1];
|
|
char file[TRACE_FILE_SIZE+1];
|
|
char correct;
|
|
};
|
|
|
|
struct hw_branch_entry {
|
|
struct trace_entry ent;
|
|
u64 from;
|
|
u64 to;
|
|
};
|
|
|
|
struct trace_power {
|
|
struct trace_entry ent;
|
|
struct power_trace state_data;
|
|
};
|
|
|
|
enum kmemtrace_type_id {
|
|
KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
|
|
KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
|
|
KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
|
|
};
|
|
|
|
struct kmemtrace_alloc_entry {
|
|
struct trace_entry ent;
|
|
enum kmemtrace_type_id type_id;
|
|
unsigned long call_site;
|
|
const void *ptr;
|
|
size_t bytes_req;
|
|
size_t bytes_alloc;
|
|
gfp_t gfp_flags;
|
|
int node;
|
|
};
|
|
|
|
struct kmemtrace_free_entry {
|
|
struct trace_entry ent;
|
|
enum kmemtrace_type_id type_id;
|
|
unsigned long call_site;
|
|
const void *ptr;
|
|
};
|
|
|
|
struct syscall_trace_enter {
|
|
struct trace_entry ent;
|
|
int nr;
|
|
unsigned long args[];
|
|
};
|
|
|
|
struct syscall_trace_exit {
|
|
struct trace_entry ent;
|
|
int nr;
|
|
unsigned long ret;
|
|
};
|
|
|
|
|
|
/*
|
|
* trace_flag_type is an enumeration that holds different
|
|
* states when a trace occurs. These are:
|
|
* IRQS_OFF - interrupts were disabled
|
|
* IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
|
|
* NEED_RESCED - reschedule is requested
|
|
* HARDIRQ - inside an interrupt handler
|
|
* SOFTIRQ - inside a softirq handler
|
|
*/
|
|
enum trace_flag_type {
|
|
TRACE_FLAG_IRQS_OFF = 0x01,
|
|
TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
|
|
TRACE_FLAG_NEED_RESCHED = 0x04,
|
|
TRACE_FLAG_HARDIRQ = 0x08,
|
|
TRACE_FLAG_SOFTIRQ = 0x10,
|
|
};
|
|
|
|
#define TRACE_BUF_SIZE 1024
|
|
|
|
/*
|
|
* The CPU trace array - it consists of thousands of trace entries
|
|
* plus some other descriptor data: (for example which task started
|
|
* the trace, etc.)
|
|
*/
|
|
struct trace_array_cpu {
|
|
atomic_t disabled;
|
|
void *buffer_page; /* ring buffer spare */
|
|
|
|
/* these fields get copied into max-trace: */
|
|
unsigned long trace_idx;
|
|
unsigned long overrun;
|
|
unsigned long saved_latency;
|
|
unsigned long critical_start;
|
|
unsigned long critical_end;
|
|
unsigned long critical_sequence;
|
|
unsigned long nice;
|
|
unsigned long policy;
|
|
unsigned long rt_priority;
|
|
cycle_t preempt_timestamp;
|
|
pid_t pid;
|
|
uid_t uid;
|
|
char comm[TASK_COMM_LEN];
|
|
};
|
|
|
|
/*
|
|
* The trace array - an array of per-CPU trace arrays. This is the
|
|
* highest level data structure that individual tracers deal with.
|
|
* They have on/off state as well:
|
|
*/
|
|
struct trace_array {
|
|
struct ring_buffer *buffer;
|
|
unsigned long entries;
|
|
int cpu;
|
|
cycle_t time_start;
|
|
struct task_struct *waiter;
|
|
struct trace_array_cpu *data[NR_CPUS];
|
|
};
|
|
|
|
#define FTRACE_CMP_TYPE(var, type) \
|
|
__builtin_types_compatible_p(typeof(var), type *)
|
|
|
|
#undef IF_ASSIGN
|
|
#define IF_ASSIGN(var, entry, etype, id) \
|
|
if (FTRACE_CMP_TYPE(var, etype)) { \
|
|
var = (typeof(var))(entry); \
|
|
WARN_ON(id && (entry)->type != id); \
|
|
break; \
|
|
}
|
|
|
|
/* Will cause compile errors if type is not found. */
|
|
extern void __ftrace_bad_type(void);
|
|
|
|
/*
|
|
* The trace_assign_type is a verifier that the entry type is
|
|
* the same as the type being assigned. To add new types simply
|
|
* add a line with the following format:
|
|
*
|
|
* IF_ASSIGN(var, ent, type, id);
|
|
*
|
|
* Where "type" is the trace type that includes the trace_entry
|
|
* as the "ent" item. And "id" is the trace identifier that is
|
|
* used in the trace_type enum.
|
|
*
|
|
* If the type can have more than one id, then use zero.
|
|
*/
|
|
#define trace_assign_type(var, ent) \
|
|
do { \
|
|
IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
|
|
IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
|
|
IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
|
|
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
|
|
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
|
|
IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
|
|
IF_ASSIGN(var, ent, struct special_entry, 0); \
|
|
IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
|
|
TRACE_MMIO_RW); \
|
|
IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
|
|
TRACE_MMIO_MAP); \
|
|
IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
|
|
IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
|
|
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
|
|
IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
|
|
TRACE_GRAPH_ENT); \
|
|
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
|
|
TRACE_GRAPH_RET); \
|
|
IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
|
|
IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
|
|
IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
|
|
TRACE_KMEM_ALLOC); \
|
|
IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
|
|
TRACE_KMEM_FREE); \
|
|
IF_ASSIGN(var, ent, struct syscall_trace_enter, \
|
|
TRACE_SYSCALL_ENTER); \
|
|
IF_ASSIGN(var, ent, struct syscall_trace_exit, \
|
|
TRACE_SYSCALL_EXIT); \
|
|
__ftrace_bad_type(); \
|
|
} while (0)
|
|
|
|
/*
|
|
* An option specific to a tracer. This is a boolean value.
|
|
* The bit is the bit index that sets its value on the
|
|
* flags value in struct tracer_flags.
|
|
*/
|
|
struct tracer_opt {
|
|
const char *name; /* Will appear on the trace_options file */
|
|
u32 bit; /* Mask assigned in val field in tracer_flags */
|
|
};
|
|
|
|
/*
|
|
* The set of specific options for a tracer. Your tracer
|
|
* have to set the initial value of the flags val.
|
|
*/
|
|
struct tracer_flags {
|
|
u32 val;
|
|
struct tracer_opt *opts;
|
|
};
|
|
|
|
/* Makes more easy to define a tracer opt */
|
|
#define TRACER_OPT(s, b) .name = #s, .bit = b
|
|
|
|
|
|
/**
|
|
* struct tracer - a specific tracer and its callbacks to interact with debugfs
|
|
* @name: the name chosen to select it on the available_tracers file
|
|
* @init: called when one switches to this tracer (echo name > current_tracer)
|
|
* @reset: called when one switches to another tracer
|
|
* @start: called when tracing is unpaused (echo 1 > tracing_enabled)
|
|
* @stop: called when tracing is paused (echo 0 > tracing_enabled)
|
|
* @open: called when the trace file is opened
|
|
* @pipe_open: called when the trace_pipe file is opened
|
|
* @wait_pipe: override how the user waits for traces on trace_pipe
|
|
* @close: called when the trace file is released
|
|
* @read: override the default read callback on trace_pipe
|
|
* @splice_read: override the default splice_read callback on trace_pipe
|
|
* @selftest: selftest to run on boot (see trace_selftest.c)
|
|
* @print_headers: override the first lines that describe your columns
|
|
* @print_line: callback that prints a trace
|
|
* @set_flag: signals one of your private flags changed (trace_options file)
|
|
* @flags: your private flags
|
|
*/
|
|
struct tracer {
|
|
const char *name;
|
|
int (*init)(struct trace_array *tr);
|
|
void (*reset)(struct trace_array *tr);
|
|
void (*start)(struct trace_array *tr);
|
|
void (*stop)(struct trace_array *tr);
|
|
void (*open)(struct trace_iterator *iter);
|
|
void (*pipe_open)(struct trace_iterator *iter);
|
|
void (*wait_pipe)(struct trace_iterator *iter);
|
|
void (*close)(struct trace_iterator *iter);
|
|
ssize_t (*read)(struct trace_iterator *iter,
|
|
struct file *filp, char __user *ubuf,
|
|
size_t cnt, loff_t *ppos);
|
|
ssize_t (*splice_read)(struct trace_iterator *iter,
|
|
struct file *filp,
|
|
loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len,
|
|
unsigned int flags);
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
int (*selftest)(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
void (*print_header)(struct seq_file *m);
|
|
enum print_line_t (*print_line)(struct trace_iterator *iter);
|
|
/* If you handled the flag setting, return 0 */
|
|
int (*set_flag)(u32 old_flags, u32 bit, int set);
|
|
struct tracer *next;
|
|
int print_max;
|
|
struct tracer_flags *flags;
|
|
struct tracer_stat *stats;
|
|
};
|
|
|
|
|
|
#define TRACE_PIPE_ALL_CPU -1
|
|
|
|
int tracer_init(struct tracer *t, struct trace_array *tr);
|
|
int tracing_is_enabled(void);
|
|
void trace_wake_up(void);
|
|
void tracing_reset(struct trace_array *tr, int cpu);
|
|
void tracing_reset_online_cpus(struct trace_array *tr);
|
|
int tracing_open_generic(struct inode *inode, struct file *filp);
|
|
struct dentry *trace_create_file(const char *name,
|
|
mode_t mode,
|
|
struct dentry *parent,
|
|
void *data,
|
|
const struct file_operations *fops);
|
|
|
|
struct dentry *tracing_init_dentry(void);
|
|
void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
|
|
|
|
struct ring_buffer_event;
|
|
|
|
struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
|
|
int type,
|
|
unsigned long len,
|
|
unsigned long flags,
|
|
int pc);
|
|
void trace_buffer_unlock_commit(struct trace_array *tr,
|
|
struct ring_buffer_event *event,
|
|
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 tracing_generic_entry_update(struct trace_entry *entry,
|
|
unsigned long flags,
|
|
int pc);
|
|
|
|
void default_wait_pipe(struct trace_iterator *iter);
|
|
void poll_wait_pipe(struct trace_iterator *iter);
|
|
|
|
void ftrace(struct trace_array *tr,
|
|
struct trace_array_cpu *data,
|
|
unsigned long ip,
|
|
unsigned long parent_ip,
|
|
unsigned long flags, int pc);
|
|
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_special(struct trace_array *tr,
|
|
struct trace_array_cpu *data,
|
|
unsigned long arg1,
|
|
unsigned long arg2,
|
|
unsigned long arg3, int pc);
|
|
void trace_function(struct trace_array *tr,
|
|
unsigned long ip,
|
|
unsigned long parent_ip,
|
|
unsigned long flags, int pc);
|
|
|
|
void trace_graph_return(struct ftrace_graph_ret *trace);
|
|
int trace_graph_entry(struct ftrace_graph_ent *trace);
|
|
|
|
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);
|
|
void unregister_tracer(struct tracer *type);
|
|
|
|
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
|
|
|
|
extern unsigned long tracing_max_latency;
|
|
extern unsigned long tracing_thresh;
|
|
|
|
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);
|
|
|
|
void __trace_stack(struct trace_array *tr,
|
|
unsigned long flags,
|
|
int skip, int pc);
|
|
|
|
extern cycle_t ftrace_now(int cpu);
|
|
|
|
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
|
|
typedef void
|
|
(*tracer_switch_func_t)(void *private,
|
|
void *__rq,
|
|
struct task_struct *prev,
|
|
struct task_struct *next);
|
|
|
|
struct tracer_switch_ops {
|
|
tracer_switch_func_t func;
|
|
void *private;
|
|
struct tracer_switch_ops *next;
|
|
};
|
|
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
|
|
|
|
extern void trace_find_cmdline(int pid, char comm[]);
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
extern unsigned long ftrace_update_tot_cnt;
|
|
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
|
|
extern int DYN_FTRACE_TEST_NAME(void);
|
|
#endif
|
|
|
|
#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_sysprof(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 unsigned long trace_flags;
|
|
|
|
/* Standard output formatting function used for function return traces */
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
extern enum print_line_t print_graph_function(struct trace_iterator *iter);
|
|
extern enum print_line_t
|
|
trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
/* TODO: make this variable */
|
|
#define FTRACE_GRAPH_MAX_FUNCS 32
|
|
extern int ftrace_graph_count;
|
|
extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
|
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
{
|
|
int i;
|
|
|
|
if (!ftrace_graph_count || test_tsk_trace_graph(current))
|
|
return 1;
|
|
|
|
for (i = 0; i < ftrace_graph_count; i++) {
|
|
if (addr == ftrace_graph_funcs[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int ftrace_trace_addr(unsigned long addr)
|
|
{
|
|
return 1;
|
|
}
|
|
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(struct trace_iterator *iter)
|
|
{
|
|
return TRACE_TYPE_UNHANDLED;
|
|
}
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
extern struct pid *ftrace_pid_trace;
|
|
|
|
static inline int ftrace_trace_task(struct task_struct *task)
|
|
{
|
|
if (!ftrace_pid_trace)
|
|
return 1;
|
|
|
|
return test_tsk_trace_trace(task);
|
|
}
|
|
|
|
/*
|
|
* 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_SCHED_TREE = 0x200,
|
|
TRACE_ITER_PRINTK = 0x400,
|
|
TRACE_ITER_PREEMPTONLY = 0x800,
|
|
TRACE_ITER_BRANCH = 0x1000,
|
|
TRACE_ITER_ANNOTATE = 0x2000,
|
|
TRACE_ITER_USERSTACKTRACE = 0x4000,
|
|
TRACE_ITER_SYM_USEROBJ = 0x8000,
|
|
TRACE_ITER_PRINTK_MSGONLY = 0x10000,
|
|
TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */
|
|
TRACE_ITER_LATENCY_FMT = 0x40000,
|
|
TRACE_ITER_GLOBAL_CLK = 0x80000,
|
|
TRACE_ITER_SLEEP_TIME = 0x100000,
|
|
TRACE_ITER_GRAPH_TIME = 0x200000,
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/**
|
|
* ftrace_preempt_disable - disable preemption scheduler safe
|
|
*
|
|
* When tracing can happen inside the scheduler, there exists
|
|
* cases that the tracing might happen before the need_resched
|
|
* flag is checked. If this happens and the tracer calls
|
|
* preempt_enable (after a disable), a schedule might take place
|
|
* causing an infinite recursion.
|
|
*
|
|
* To prevent this, we read the need_resched flag before
|
|
* disabling preemption. When we want to enable preemption we
|
|
* check the flag, if it is set, then we call preempt_enable_no_resched.
|
|
* Otherwise, we call preempt_enable.
|
|
*
|
|
* The rational for doing the above is that if need_resched is set
|
|
* and we have yet to reschedule, we are either in an atomic location
|
|
* (where we do not need to check for scheduling) or we are inside
|
|
* the scheduler and do not want to resched.
|
|
*/
|
|
static inline int ftrace_preempt_disable(void)
|
|
{
|
|
int resched;
|
|
|
|
resched = need_resched();
|
|
preempt_disable_notrace();
|
|
|
|
return resched;
|
|
}
|
|
|
|
/**
|
|
* ftrace_preempt_enable - enable preemption scheduler safe
|
|
* @resched: the return value from ftrace_preempt_disable
|
|
*
|
|
* This is a scheduler safe way to enable preemption and not miss
|
|
* any preemption checks. The disabled saved the state of preemption.
|
|
* If resched is set, then we are either inside an atomic or
|
|
* are inside the scheduler (we would have already scheduled
|
|
* otherwise). In this case, we do not want to call normal
|
|
* preempt_enable, but preempt_enable_no_resched instead.
|
|
*/
|
|
static inline void ftrace_preempt_enable(int resched)
|
|
{
|
|
if (resched)
|
|
preempt_enable_no_resched_notrace();
|
|
else
|
|
preempt_enable_notrace();
|
|
}
|
|
|
|
#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);
|
|
|
|
/* trace event type bit fields, not numeric */
|
|
enum {
|
|
TRACE_EVENT_TYPE_PRINTF = 1,
|
|
TRACE_EVENT_TYPE_RAW = 2,
|
|
};
|
|
|
|
struct ftrace_event_field {
|
|
struct list_head link;
|
|
char *name;
|
|
char *type;
|
|
int offset;
|
|
int size;
|
|
};
|
|
|
|
struct event_subsystem {
|
|
struct list_head list;
|
|
const char *name;
|
|
struct dentry *entry;
|
|
int n_preds;
|
|
struct filter_pred **preds;
|
|
};
|
|
|
|
struct filter_pred;
|
|
|
|
typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
|
|
|
|
struct filter_pred {
|
|
filter_pred_fn_t fn;
|
|
u64 val;
|
|
char str_val[MAX_FILTER_STR_VAL];
|
|
int str_len;
|
|
char *field_name;
|
|
int offset;
|
|
int not;
|
|
int or;
|
|
int compound;
|
|
int clear;
|
|
};
|
|
|
|
extern void filter_free_pred(struct filter_pred *pred);
|
|
extern void filter_print_preds(struct ftrace_event_call *call,
|
|
struct trace_seq *s);
|
|
extern int filter_parse(char **pbuf, struct filter_pred *pred);
|
|
extern int filter_add_pred(struct ftrace_event_call *call,
|
|
struct filter_pred *pred);
|
|
extern void filter_disable_preds(struct ftrace_event_call *call);
|
|
extern void filter_free_subsystem_preds(struct event_subsystem *system);
|
|
extern void filter_print_subsystem_preds(struct event_subsystem *system,
|
|
struct trace_seq *s);
|
|
extern int filter_add_subsystem_pred(struct event_subsystem *system,
|
|
struct filter_pred *pred);
|
|
|
|
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->n_preds) && !filter_match_preds(call, rec)) {
|
|
ring_buffer_discard_commit(buffer, event);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
extern struct list_head ftrace_events;
|
|
|
|
extern const char *__start___trace_bprintk_fmt[];
|
|
extern const char *__stop___trace_bprintk_fmt[];
|
|
|
|
#undef TRACE_EVENT_FORMAT
|
|
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
|
|
extern struct ftrace_event_call event_##call;
|
|
#undef TRACE_EVENT_FORMAT_NOFILTER
|
|
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
|
|
#include "trace_event_types.h"
|
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|