diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
commit | e5fd91f1ef340da553f7a79da9540c3db711c937 (patch) | |
tree | b11842027dc6641da63f4bcc524f8678263304a3 /include/linux/ftrace_event.h | |
parent | 2a9b0348e685a63d97486f6749622b61e9e3292f (diff) |
Linux-libre 4.2-gnu
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r-- | include/linux/ftrace_event.h | 627 |
1 files changed, 0 insertions, 627 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h deleted file mode 100644 index f9ecf63d4..000000000 --- a/include/linux/ftrace_event.h +++ /dev/null @@ -1,627 +0,0 @@ - -#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 bpf_prog; - -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); - -const char *ftrace_print_array_seq(struct trace_seq *p, - const void *buf, int count, - size_t el_size); - -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 */ -}; - -/* - * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq - * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function - * simplifies those functions and keeps them in sync. - */ -static inline enum print_line_t trace_handle_return(struct trace_seq *s) -{ - return trace_seq_has_overflowed(s) ? - TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; -} - -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 { - const 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, - TRACE_EVENT_FL_KPROBE_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 - * KPROBE - Event is a kprobe - */ -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), - TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_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; - char *print_fmt; - struct event_filter *filter; - 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; - struct bpf_prog *prog; - - 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 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); -} - -#ifdef CONFIG_BPF_SYSCALL -unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx); -#else -static inline unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx) -{ - return 1; -} -#endif - -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) - -#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 */ |