| #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> |
| |
| struct trace_array; |
| struct tracer; |
| struct dentry; |
| |
| struct trace_print_flags { |
| unsigned 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); |
| |
| 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; |
| |
| /* trace_seq for __print_flags() and __print_symbolic() etc. */ |
| struct trace_seq tmp_seq; |
| |
| /* The below is zeroed out in pipe_read */ |
| struct trace_seq seq; |
| struct trace_entry *ent; |
| unsigned long lost_events; |
| int leftover; |
| int cpu; |
| u64 ts; |
| |
| loff_t pos; |
| long idx; |
| |
| cpumask_var_t started; |
| }; |
| |
| |
| struct trace_event; |
| |
| 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 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_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_reg { |
| TRACE_REG_REGISTER, |
| TRACE_REG_UNREGISTER, |
| TRACE_REG_PERF_REGISTER, |
| TRACE_REG_PERF_UNREGISTER, |
| }; |
| |
| 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); |
| 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); |
| |
| enum { |
| TRACE_EVENT_FL_ENABLED_BIT, |
| TRACE_EVENT_FL_FILTERED_BIT, |
| TRACE_EVENT_FL_RECORDED_CMD_BIT, |
| TRACE_EVENT_FL_CAP_ANY_BIT, |
| }; |
| |
| 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_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT), |
| }; |
| |
| struct ftrace_event_call { |
| struct list_head list; |
| struct ftrace_event_class *class; |
| char *name; |
| struct dentry *dir; |
| struct trace_event event; |
| const char *print_fmt; |
| struct event_filter *filter; |
| void *mod; |
| void *data; |
| |
| /* |
| * 32 bit flags: |
| * bit 1: enabled |
| * bit 2: filter_active |
| * bit 3: enabled cmd record |
| * |
| * 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; |
| |
| #ifdef CONFIG_PERF_EVENTS |
| int perf_refcount; |
| struct hlist_head __percpu *perf_events; |
| #endif |
| }; |
| |
| #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 PERF_MAX_TRACE_SIZE 2048 |
| |
| #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_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 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_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) |
| { |
| perf_tp_event(addr, count, raw_data, size, regs, head, rctx); |
| } |
| #endif |
| |
| #endif /* _LINUX_FTRACE_EVENT_H */ |