diff options
Diffstat (limited to 'include/linux/ftrace_event.h')
| -rw-r--r-- | include/linux/ftrace_event.h | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h new file mode 100644 index 00000000000..2233c98d80d --- /dev/null +++ b/include/linux/ftrace_event.h @@ -0,0 +1,200 @@ +#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> + +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; +}; + +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); + +/* + * 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 leftover; + int cpu; + u64 ts; + + loff_t pos; + long idx; + + cpumask_var_t started; +}; + + +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_current_buffer_discard_commit(struct ring_buffer *buffer, + struct ring_buffer_event *event); + +void tracing_record_cmdline(struct task_struct *tsk); + +struct event_filter; + +struct ftrace_event_call { + struct list_head list; + char *name; + char *system; + struct dentry *dir; + struct trace_event *event; + int enabled; + int (*regfunc)(struct ftrace_event_call *); + void (*unregfunc)(struct ftrace_event_call *); + int id; + int (*raw_init)(struct ftrace_event_call *); + int (*show_format)(struct ftrace_event_call *, + struct trace_seq *); + int (*define_fields)(struct ftrace_event_call *); + struct list_head fields; + int filter_active; + struct event_filter *filter; + void *mod; + void *data; + + int profile_count; + int (*profile_enable)(struct ftrace_event_call *); + void (*profile_disable)(struct ftrace_event_call *); +}; + +#define FTRACE_MAX_PROFILE_SIZE 2048 + +extern char *perf_trace_buf; +extern char *perf_trace_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_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_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); +#endif + +#endif /* _LINUX_FTRACE_EVENT_H */ |