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#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>
#ifndef __GENKSYMS__
#include <linux/perf_event.h>
#endif
struct trace_array;
struct tracer;
struct dentry;
DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);
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_hex_seq(struct trace_seq *p,
const unsigned char *buf, int len);
/*
* 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;
int lock_depth;
};
#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;
void *private;
int cpu_file;
struct mutex mutex;
struct ring_buffer_iter *buffer_iter[NR_CPUS];
unsigned long iter_flags;
/* The below is zeroed out in pipe_read */
struct trace_seq seq;
struct trace_entry *ent;
int cpu;
u64 ts;
loff_t pos;
long idx;
cpumask_var_t started;
#ifndef __GENKSYMS__
int leftover;
#endif
};
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 {
struct hlist_node node;
struct list_head list;
int type;
trace_print_func trace;
trace_print_func raw;
trace_print_func hex;
trace_print_func binary;
};
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 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_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
struct ring_buffer_event *event,
unsigned long flags, int pc);
void trace_nowake_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);
struct event_filter;
enum {
TRACE_EVENT_FL_ENABLED_BIT,
TRACE_EVENT_FL_FILTERED_BIT,
TRACE_EVENT_FL_RECORDED_CMD_BIT,
/*
* RHEL6 specific bit.
*
* Due to KABI constraints, we cannot change ftrace_event_call
* struct. This bit is to differentiate among current RHEL6
* version with 'print_fmt' pointer and older releases versions
* with show_format pointer. Both occupy same place.
*/
TRACE_EVENT_FL_KABI_PRINT_FMT_BIT = 31,
};
enum {
TRACE_EVENT_FL_ENABLED = (1 << TRACE_EVENT_FL_ENABLED_BIT),
TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
TRACE_EVENT_FL_RECORDED_CMD = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT),
TRACE_EVENT_FL_KABI_PRINT_FMT = (1 << TRACE_EVENT_FL_KABI_PRINT_FMT_BIT),
};
struct ftrace_event_call {
struct list_head list;
char *name;
char *system;
struct dentry *dir;
struct trace_event *event;
/* The enabled field was invalidated by flags field,
* but is left here due to the KABI constrains. */
int enabled;
int (*regfunc)(struct ftrace_event_call *);
void (*unregfunc)(struct ftrace_event_call *);
int id;
int (*raw_init)(struct ftrace_event_call *);
#ifdef __GENKSYMS__
int (*show_format)(struct ftrace_event_call *,
struct trace_seq *);
#else
/*
* RHEL6 specific.
*
* TRACE_EVENT_FL_KABI_PRINT_FMT flags bit tells what
* pointer to use. From this version onward RHEL6 uses
* print_fmt and have TRACE_EVENT_FL_KABI_PRINT_FMT
* flags bit enabled by default. Older releases have this
* flags bit set to 0 and use show_format pointer.
*/
union {
int (*show_format)(struct ftrace_event_call *,
struct trace_seq *);
const char *print_fmt;
} fmt;
#endif
int (*define_fields)(struct ftrace_event_call *);
struct list_head fields;
#ifdef __GENKSYMS__
int filter_active;
#else
/*
* 32 bit flags:
* bit 1: enabled
* bit 2: filter_active
* bit 3: enabled cmd record
* bit 31: print_fmt format display
* (read TRACE_EVENT_FL_KABI_PRINT_FMT_BIT
* enum comment)
*
* Changes to flags must hold the event_mutex.
*
* Note: Reads of flags do not hold the event_mutex since
* they occur in critical sections. But the way flags
* is currently used, these changes do no 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.
*/
unsigned int flags;
#endif
struct event_filter *filter;
void *mod;
void *data;
atomic_t profile_count;
int (*profile_enable)(struct ftrace_event_call *);
void (*profile_disable)(struct ftrace_event_call *);
};
#define FTRACE_MAX_PROFILE_SIZE 2048
extern char *trace_profile_buf;
extern char *trace_profile_buf_nmi;
#define MAX_FILTER_PRED 32
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
extern void destroy_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct event_filter *filter, void *rec);
extern int filter_current_check_discard(struct ring_buffer *buffer,
struct ftrace_event_call *call,
void *rec,
struct ring_buffer_event *event);
enum {
FILTER_OTHER = 0,
FILTER_STATIC_STRING,
FILTER_DYN_STRING,
FILTER_PTR_STRING,
};
extern int trace_define_common_fields(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 void trace_remove_event_call(struct ftrace_event_call *call);
#define is_signed_type(type) (((type)(-1)) < 0)
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)
#ifdef CONFIG_EVENT_PROFILE
struct perf_event;
extern int ftrace_profile_enable(int event_id);
extern void ftrace_profile_disable(int event_id);
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 *
ftrace_perf_buf_prepare(int size, unsigned short type, int *rctxp,
unsigned long *irq_flags);
static inline void
ftrace_perf_buf_submit(void *raw_data, int size, int rctx, u64 addr,
u64 count, unsigned long irq_flags,
struct pt_regs *regs)
{
struct trace_entry *entry = raw_data;
perf_tp_event_regs(entry->type, addr, count, raw_data, size, regs);
perf_swevent_put_recursion_context(rctx);
local_irq_restore(irq_flags);
}
#endif
#define PTRS_MASK 1
static inline bool use_ftrace_events_ptrs(void *ptr)
{
return ((unsigned long) ptr & PTRS_MASK) == 0;
}
static inline bool module_has_ftrace_events_ptrs(struct module *mod)
{
return (unsigned long) mod->trace_events.ptrs & PTRS_MASK;
}
static inline struct ftrace_event_call**
ftrace_events_ptrs_mask(struct ftrace_event_call** ptrs)
{
unsigned long p = (unsigned long) ptrs;
p |= PTRS_MASK;
return (struct ftrace_event_call**) p;
}
static inline struct ftrace_event_call**
module_ftrace_events_ptrs_unmask(struct ftrace_event_call** ptrs)
{
unsigned long p = (unsigned long) ptrs;
p &= ~PTRS_MASK;
return (struct ftrace_event_call**) p;
}
#undef PTRS_MASK
#endif /* _LINUX_FTRACE_EVENT_H */
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