![Oleg Nesterov](/assets/img/avatar_default.png)
destroy_preds() makes no sense. The only caller, event_remove(), actually wants destroy_file_preds(). __trace_remove_event_call() does destroy_call_preds() which takes care of call->filter. And after the previous change we can simply remove destroy_preds() from event_remove(), we are going to call remove_event_from_tracers() which in turn calls remove_event_file_dir()->free_event_filter(). Link: http://lkml.kernel.org/p/20140715184813.GA20488@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
635 lines
20 KiB
C
635 lines
20 KiB
C
|
|
#ifndef _LINUX_FTRACE_EVENT_H
|
|
#define _LINUX_FTRACE_EVENT_H
|
|
|
|
#include <linux/ring_buffer.h>
|
|
#include <linux/trace_seq.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/tracepoint.h>
|
|
|
|
struct trace_array;
|
|
struct trace_buffer;
|
|
struct tracer;
|
|
struct dentry;
|
|
|
|
struct trace_print_flags {
|
|
unsigned long mask;
|
|
const char *name;
|
|
};
|
|
|
|
struct trace_print_flags_u64 {
|
|
unsigned long long mask;
|
|
const char *name;
|
|
};
|
|
|
|
const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
|
|
unsigned long flags,
|
|
const struct trace_print_flags *flag_array);
|
|
|
|
const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
|
|
const struct trace_print_flags *symbol_array);
|
|
|
|
#if BITS_PER_LONG == 32
|
|
const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
|
|
unsigned long long val,
|
|
const struct trace_print_flags_u64
|
|
*symbol_array);
|
|
#endif
|
|
|
|
const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
|
|
unsigned int bitmask_size);
|
|
|
|
const char *ftrace_print_hex_seq(struct trace_seq *p,
|
|
const unsigned char *buf, int len);
|
|
|
|
struct trace_iterator;
|
|
struct trace_event;
|
|
|
|
int ftrace_raw_output_prep(struct trace_iterator *iter,
|
|
struct trace_event *event);
|
|
|
|
/*
|
|
* The trace entry - the most basic unit of tracing. This is what
|
|
* is printed in the end as a single line in the trace output, such as:
|
|
*
|
|
* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
|
|
*/
|
|
struct trace_entry {
|
|
unsigned short type;
|
|
unsigned char flags;
|
|
unsigned char preempt_count;
|
|
int pid;
|
|
};
|
|
|
|
#define FTRACE_MAX_EVENT \
|
|
((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
|
|
|
|
/*
|
|
* Trace iterator - used by printout routines who present trace
|
|
* results to users and which routines might sleep, etc:
|
|
*/
|
|
struct trace_iterator {
|
|
struct trace_array *tr;
|
|
struct tracer *trace;
|
|
struct trace_buffer *trace_buffer;
|
|
void *private;
|
|
int cpu_file;
|
|
struct mutex mutex;
|
|
struct ring_buffer_iter **buffer_iter;
|
|
unsigned long iter_flags;
|
|
|
|
/* trace_seq for __print_flags() and __print_symbolic() etc. */
|
|
struct trace_seq tmp_seq;
|
|
|
|
cpumask_var_t started;
|
|
|
|
/* it's true when current open file is snapshot */
|
|
bool snapshot;
|
|
|
|
/* The below is zeroed out in pipe_read */
|
|
struct trace_seq seq;
|
|
struct trace_entry *ent;
|
|
unsigned long lost_events;
|
|
int leftover;
|
|
int ent_size;
|
|
int cpu;
|
|
u64 ts;
|
|
|
|
loff_t pos;
|
|
long idx;
|
|
|
|
/* All new field here will be zeroed out in pipe_read */
|
|
};
|
|
|
|
enum trace_iter_flags {
|
|
TRACE_FILE_LAT_FMT = 1,
|
|
TRACE_FILE_ANNOTATE = 2,
|
|
TRACE_FILE_TIME_IN_NS = 4,
|
|
};
|
|
|
|
|
|
typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
|
|
int flags, struct trace_event *event);
|
|
|
|
struct trace_event_functions {
|
|
trace_print_func trace;
|
|
trace_print_func raw;
|
|
trace_print_func hex;
|
|
trace_print_func binary;
|
|
};
|
|
|
|
struct trace_event {
|
|
struct hlist_node node;
|
|
struct list_head list;
|
|
int type;
|
|
struct trace_event_functions *funcs;
|
|
};
|
|
|
|
extern int register_ftrace_event(struct trace_event *event);
|
|
extern int unregister_ftrace_event(struct trace_event *event);
|
|
|
|
/* Return values for print_line callback */
|
|
enum print_line_t {
|
|
TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
|
|
TRACE_TYPE_HANDLED = 1,
|
|
TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
|
|
TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
|
|
};
|
|
|
|
void tracing_generic_entry_update(struct trace_entry *entry,
|
|
unsigned long flags,
|
|
int pc);
|
|
struct ftrace_event_file;
|
|
|
|
struct ring_buffer_event *
|
|
trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
|
|
struct ftrace_event_file *ftrace_file,
|
|
int type, unsigned long len,
|
|
unsigned long flags, int pc);
|
|
struct ring_buffer_event *
|
|
trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
|
|
int type, unsigned long len,
|
|
unsigned long flags, int pc);
|
|
void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
unsigned long flags, int pc);
|
|
void trace_buffer_unlock_commit(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
unsigned long flags, int pc);
|
|
void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
unsigned long flags, int pc,
|
|
struct pt_regs *regs);
|
|
void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
|
|
void tracing_record_cmdline(struct task_struct *tsk);
|
|
|
|
int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
|
|
|
|
struct event_filter;
|
|
|
|
enum trace_reg {
|
|
TRACE_REG_REGISTER,
|
|
TRACE_REG_UNREGISTER,
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
TRACE_REG_PERF_REGISTER,
|
|
TRACE_REG_PERF_UNREGISTER,
|
|
TRACE_REG_PERF_OPEN,
|
|
TRACE_REG_PERF_CLOSE,
|
|
TRACE_REG_PERF_ADD,
|
|
TRACE_REG_PERF_DEL,
|
|
#endif
|
|
};
|
|
|
|
struct ftrace_event_call;
|
|
|
|
struct ftrace_event_class {
|
|
char *system;
|
|
void *probe;
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
void *perf_probe;
|
|
#endif
|
|
int (*reg)(struct ftrace_event_call *event,
|
|
enum trace_reg type, void *data);
|
|
int (*define_fields)(struct ftrace_event_call *);
|
|
struct list_head *(*get_fields)(struct ftrace_event_call *);
|
|
struct list_head fields;
|
|
int (*raw_init)(struct ftrace_event_call *);
|
|
};
|
|
|
|
extern int ftrace_event_reg(struct ftrace_event_call *event,
|
|
enum trace_reg type, void *data);
|
|
|
|
int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
|
|
char *fmt, ...);
|
|
|
|
int ftrace_event_define_field(struct ftrace_event_call *call,
|
|
char *type, int len, char *item, int offset,
|
|
int field_size, int sign, int filter);
|
|
|
|
struct ftrace_event_buffer {
|
|
struct ring_buffer *buffer;
|
|
struct ring_buffer_event *event;
|
|
struct ftrace_event_file *ftrace_file;
|
|
void *entry;
|
|
unsigned long flags;
|
|
int pc;
|
|
};
|
|
|
|
void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
|
|
struct ftrace_event_file *ftrace_file,
|
|
unsigned long len);
|
|
|
|
void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer);
|
|
|
|
int ftrace_event_define_field(struct ftrace_event_call *call,
|
|
char *type, int len, char *item, int offset,
|
|
int field_size, int sign, int filter);
|
|
|
|
enum {
|
|
TRACE_EVENT_FL_FILTERED_BIT,
|
|
TRACE_EVENT_FL_CAP_ANY_BIT,
|
|
TRACE_EVENT_FL_NO_SET_FILTER_BIT,
|
|
TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
|
|
TRACE_EVENT_FL_WAS_ENABLED_BIT,
|
|
TRACE_EVENT_FL_USE_CALL_FILTER_BIT,
|
|
TRACE_EVENT_FL_TRACEPOINT_BIT,
|
|
};
|
|
|
|
/*
|
|
* Event flags:
|
|
* FILTERED - The event has a filter attached
|
|
* CAP_ANY - Any user can enable for perf
|
|
* NO_SET_FILTER - Set when filter has error and is to be ignored
|
|
* IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file
|
|
* WAS_ENABLED - Set and stays set when an event was ever enabled
|
|
* (used for module unloading, if a module event is enabled,
|
|
* it is best to clear the buffers that used it).
|
|
* USE_CALL_FILTER - For ftrace internal events, don't use file filter
|
|
* TRACEPOINT - Event is a tracepoint
|
|
*/
|
|
enum {
|
|
TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
|
|
TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
|
|
TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
|
|
TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
|
|
TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
|
|
TRACE_EVENT_FL_USE_CALL_FILTER = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT),
|
|
TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
|
|
};
|
|
|
|
struct ftrace_event_call {
|
|
struct list_head list;
|
|
struct ftrace_event_class *class;
|
|
union {
|
|
char *name;
|
|
/* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
|
|
struct tracepoint *tp;
|
|
};
|
|
struct trace_event event;
|
|
const char *print_fmt;
|
|
struct event_filter *filter;
|
|
struct list_head *files;
|
|
void *mod;
|
|
void *data;
|
|
/*
|
|
* bit 0: filter_active
|
|
* bit 1: allow trace by non root (cap any)
|
|
* bit 2: failed to apply filter
|
|
* bit 3: ftrace internal event (do not enable)
|
|
* bit 4: Event was enabled by module
|
|
* bit 5: use call filter rather than file filter
|
|
* bit 6: Event is a tracepoint
|
|
*/
|
|
int flags; /* static flags of different events */
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
int perf_refcount;
|
|
struct hlist_head __percpu *perf_events;
|
|
|
|
int (*perf_perm)(struct ftrace_event_call *,
|
|
struct perf_event *);
|
|
#endif
|
|
};
|
|
|
|
static inline const char *
|
|
ftrace_event_name(struct ftrace_event_call *call)
|
|
{
|
|
if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
|
|
return call->tp ? call->tp->name : NULL;
|
|
else
|
|
return call->name;
|
|
}
|
|
|
|
struct trace_array;
|
|
struct ftrace_subsystem_dir;
|
|
|
|
enum {
|
|
FTRACE_EVENT_FL_ENABLED_BIT,
|
|
FTRACE_EVENT_FL_RECORDED_CMD_BIT,
|
|
FTRACE_EVENT_FL_FILTERED_BIT,
|
|
FTRACE_EVENT_FL_NO_SET_FILTER_BIT,
|
|
FTRACE_EVENT_FL_SOFT_MODE_BIT,
|
|
FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
|
|
FTRACE_EVENT_FL_TRIGGER_MODE_BIT,
|
|
FTRACE_EVENT_FL_TRIGGER_COND_BIT,
|
|
};
|
|
|
|
/*
|
|
* Ftrace event file flags:
|
|
* ENABLED - The event is enabled
|
|
* RECORDED_CMD - The comms should be recorded at sched_switch
|
|
* FILTERED - The event has a filter attached
|
|
* NO_SET_FILTER - Set when filter has error and is to be ignored
|
|
* SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
|
|
* SOFT_DISABLED - When set, do not trace the event (even though its
|
|
* tracepoint may be enabled)
|
|
* TRIGGER_MODE - When set, invoke the triggers associated with the event
|
|
* TRIGGER_COND - When set, one or more triggers has an associated filter
|
|
*/
|
|
enum {
|
|
FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT),
|
|
FTRACE_EVENT_FL_RECORDED_CMD = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT),
|
|
FTRACE_EVENT_FL_FILTERED = (1 << FTRACE_EVENT_FL_FILTERED_BIT),
|
|
FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT),
|
|
FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT),
|
|
FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT),
|
|
FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT),
|
|
FTRACE_EVENT_FL_TRIGGER_COND = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT),
|
|
};
|
|
|
|
struct ftrace_event_file {
|
|
struct list_head list;
|
|
struct ftrace_event_call *event_call;
|
|
struct event_filter *filter;
|
|
struct dentry *dir;
|
|
struct trace_array *tr;
|
|
struct ftrace_subsystem_dir *system;
|
|
struct list_head triggers;
|
|
|
|
/*
|
|
* 32 bit flags:
|
|
* bit 0: enabled
|
|
* bit 1: enabled cmd record
|
|
* bit 2: enable/disable with the soft disable bit
|
|
* bit 3: soft disabled
|
|
* bit 4: trigger enabled
|
|
*
|
|
* Note: The bits must be set atomically to prevent races
|
|
* from other writers. Reads of flags do not need to be in
|
|
* sync as they occur in critical sections. But the way flags
|
|
* is currently used, these changes do not affect the code
|
|
* except that when a change is made, it may have a slight
|
|
* delay in propagating the changes to other CPUs due to
|
|
* caching and such. Which is mostly OK ;-)
|
|
*/
|
|
unsigned long flags;
|
|
atomic_t sm_ref; /* soft-mode reference counter */
|
|
atomic_t tm_ref; /* trigger-mode reference counter */
|
|
};
|
|
|
|
#define __TRACE_EVENT_FLAGS(name, value) \
|
|
static int __init trace_init_flags_##name(void) \
|
|
{ \
|
|
event_##name.flags |= value; \
|
|
return 0; \
|
|
} \
|
|
early_initcall(trace_init_flags_##name);
|
|
|
|
#define __TRACE_EVENT_PERF_PERM(name, expr...) \
|
|
static int perf_perm_##name(struct ftrace_event_call *tp_event, \
|
|
struct perf_event *p_event) \
|
|
{ \
|
|
return ({ expr; }); \
|
|
} \
|
|
static int __init trace_init_perf_perm_##name(void) \
|
|
{ \
|
|
event_##name.perf_perm = &perf_perm_##name; \
|
|
return 0; \
|
|
} \
|
|
early_initcall(trace_init_perf_perm_##name);
|
|
|
|
#define PERF_MAX_TRACE_SIZE 2048
|
|
|
|
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
|
|
|
|
enum event_trigger_type {
|
|
ETT_NONE = (0),
|
|
ETT_TRACE_ONOFF = (1 << 0),
|
|
ETT_SNAPSHOT = (1 << 1),
|
|
ETT_STACKTRACE = (1 << 2),
|
|
ETT_EVENT_ENABLE = (1 << 3),
|
|
};
|
|
|
|
extern void destroy_call_preds(struct ftrace_event_call *call);
|
|
extern int filter_match_preds(struct event_filter *filter, void *rec);
|
|
|
|
extern int filter_check_discard(struct ftrace_event_file *file, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file,
|
|
void *rec);
|
|
extern void event_triggers_post_call(struct ftrace_event_file *file,
|
|
enum event_trigger_type tt);
|
|
|
|
/**
|
|
* ftrace_trigger_soft_disabled - do triggers and test if soft disabled
|
|
* @file: The file pointer of the event to test
|
|
*
|
|
* If any triggers without filters are attached to this event, they
|
|
* will be called here. If the event is soft disabled and has no
|
|
* triggers that require testing the fields, it will return true,
|
|
* otherwise false.
|
|
*/
|
|
static inline bool
|
|
ftrace_trigger_soft_disabled(struct ftrace_event_file *file)
|
|
{
|
|
unsigned long eflags = file->flags;
|
|
|
|
if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
|
|
if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
|
|
event_triggers_call(file, NULL);
|
|
if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Helper function for event_trigger_unlock_commit{_regs}().
|
|
* If there are event triggers attached to this event that requires
|
|
* filtering against its fields, then they wil be called as the
|
|
* entry already holds the field information of the current event.
|
|
*
|
|
* It also checks if the event should be discarded or not.
|
|
* It is to be discarded if the event is soft disabled and the
|
|
* event was only recorded to process triggers, or if the event
|
|
* filter is active and this event did not match the filters.
|
|
*
|
|
* Returns true if the event is discarded, false otherwise.
|
|
*/
|
|
static inline bool
|
|
__event_trigger_test_discard(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry,
|
|
enum event_trigger_type *tt)
|
|
{
|
|
unsigned long eflags = file->flags;
|
|
|
|
if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
|
|
*tt = event_triggers_call(file, entry);
|
|
|
|
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags))
|
|
ring_buffer_discard_commit(buffer, event);
|
|
else if (!filter_check_discard(file, entry, buffer, event))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt);
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit_regs - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*
|
|
* Same as event_trigger_unlock_commit() but calls
|
|
* trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit_regs(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc,
|
|
struct pt_regs *regs)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit_regs(buffer, event,
|
|
irq_flags, pc, regs);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt);
|
|
}
|
|
|
|
enum {
|
|
FILTER_OTHER = 0,
|
|
FILTER_STATIC_STRING,
|
|
FILTER_DYN_STRING,
|
|
FILTER_PTR_STRING,
|
|
FILTER_TRACE_FN,
|
|
};
|
|
|
|
extern int trace_event_raw_init(struct ftrace_event_call *call);
|
|
extern int trace_define_field(struct ftrace_event_call *call, const char *type,
|
|
const char *name, int offset, int size,
|
|
int is_signed, int filter_type);
|
|
extern int trace_add_event_call(struct ftrace_event_call *call);
|
|
extern int trace_remove_event_call(struct ftrace_event_call *call);
|
|
|
|
#define is_signed_type(type) (((type)(-1)) < (type)1)
|
|
|
|
int trace_set_clr_event(const char *system, const char *event, int set);
|
|
|
|
/*
|
|
* The double __builtin_constant_p is because gcc will give us an error
|
|
* if we try to allocate the static variable to fmt if it is not a
|
|
* constant. Even with the outer if statement optimizing out.
|
|
*/
|
|
#define event_trace_printk(ip, fmt, args...) \
|
|
do { \
|
|
__trace_printk_check_format(fmt, ##args); \
|
|
tracing_record_cmdline(current); \
|
|
if (__builtin_constant_p(fmt)) { \
|
|
static const char *trace_printk_fmt \
|
|
__attribute__((section("__trace_printk_fmt"))) = \
|
|
__builtin_constant_p(fmt) ? fmt : NULL; \
|
|
\
|
|
__trace_bprintk(ip, trace_printk_fmt, ##args); \
|
|
} else \
|
|
__trace_printk(ip, fmt, ##args); \
|
|
} while (0)
|
|
|
|
/**
|
|
* tracepoint_string - register constant persistent string to trace system
|
|
* @str - a constant persistent string that will be referenced in tracepoints
|
|
*
|
|
* If constant strings are being used in tracepoints, it is faster and
|
|
* more efficient to just save the pointer to the string and reference
|
|
* that with a printf "%s" instead of saving the string in the ring buffer
|
|
* and wasting space and time.
|
|
*
|
|
* The problem with the above approach is that userspace tools that read
|
|
* the binary output of the trace buffers do not have access to the string.
|
|
* Instead they just show the address of the string which is not very
|
|
* useful to users.
|
|
*
|
|
* With tracepoint_string(), the string will be registered to the tracing
|
|
* system and exported to userspace via the debugfs/tracing/printk_formats
|
|
* file that maps the string address to the string text. This way userspace
|
|
* tools that read the binary buffers have a way to map the pointers to
|
|
* the ASCII strings they represent.
|
|
*
|
|
* The @str used must be a constant string and persistent as it would not
|
|
* make sense to show a string that no longer exists. But it is still fine
|
|
* to be used with modules, because when modules are unloaded, if they
|
|
* had tracepoints, the ring buffers are cleared too. As long as the string
|
|
* does not change during the life of the module, it is fine to use
|
|
* tracepoint_string() within a module.
|
|
*/
|
|
#define tracepoint_string(str) \
|
|
({ \
|
|
static const char *___tp_str __tracepoint_string = str; \
|
|
___tp_str; \
|
|
})
|
|
#define __tracepoint_string __attribute__((section("__tracepoint_str")))
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
struct perf_event;
|
|
|
|
DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
|
|
|
|
extern int perf_trace_init(struct perf_event *event);
|
|
extern void perf_trace_destroy(struct perf_event *event);
|
|
extern int perf_trace_add(struct perf_event *event, int flags);
|
|
extern void perf_trace_del(struct perf_event *event, int flags);
|
|
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
|
|
char *filter_str);
|
|
extern void ftrace_profile_free_filter(struct perf_event *event);
|
|
extern void *perf_trace_buf_prepare(int size, unsigned short type,
|
|
struct pt_regs *regs, int *rctxp);
|
|
|
|
static inline void
|
|
perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
|
|
u64 count, struct pt_regs *regs, void *head,
|
|
struct task_struct *task)
|
|
{
|
|
perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_FTRACE_EVENT_H */
|