7a4f453b6d
struct trace_entry->type is unsigned char, while trace event's id is
int type, thus for a event with id >= 256, it's entry->type is cast
to (id % 256), and then we can't see the trace output of this event.
# insmod trace-events-sample.ko
# echo foo_bar > /mnt/tracing/set_event
# cat /debug/tracing/events/trace-events-sample/foo_bar/id
256
# cat /mnt/tracing/trace_pipe
<...>-3548 [001] 215.091142: Unknown type 0
<...>-3548 [001] 216.089207: Unknown type 0
<...>-3548 [001] 217.087271: Unknown type 0
<...>-3548 [001] 218.085332: Unknown type 0
[ Impact: fix output for trace events with id >= 256 ]
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <49EEDB0E.5070207@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
150 lines
4 KiB
C
150 lines
4 KiB
C
#ifndef _LINUX_FTRACE_EVENT_H
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#define _LINUX_FTRACE_EVENT_H
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#include <linux/trace_seq.h>
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#include <linux/ring_buffer.h>
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struct trace_array;
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struct tracer;
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struct dentry;
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/*
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* The trace entry - the most basic unit of tracing. This is what
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* is printed in the end as a single line in the trace output, such as:
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*
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* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
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*/
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struct trace_entry {
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int type;
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unsigned char flags;
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unsigned char preempt_count;
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int pid;
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int tgid;
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};
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/*
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* Trace iterator - used by printout routines who present trace
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* results to users and which routines might sleep, etc:
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*/
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struct trace_iterator {
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struct trace_array *tr;
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struct tracer *trace;
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void *private;
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int cpu_file;
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struct mutex mutex;
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struct ring_buffer_iter *buffer_iter[NR_CPUS];
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/* The below is zeroed out in pipe_read */
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struct trace_seq seq;
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struct trace_entry *ent;
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int cpu;
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u64 ts;
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unsigned long iter_flags;
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loff_t pos;
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long idx;
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cpumask_var_t started;
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};
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typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
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int flags);
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struct trace_event {
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struct hlist_node node;
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int type;
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trace_print_func trace;
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trace_print_func raw;
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trace_print_func hex;
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trace_print_func binary;
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};
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extern int register_ftrace_event(struct trace_event *event);
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extern int unregister_ftrace_event(struct trace_event *event);
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/* Return values for print_line callback */
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enum print_line_t {
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TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
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TRACE_TYPE_HANDLED = 1,
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TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
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TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
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};
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struct ring_buffer_event *
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trace_current_buffer_lock_reserve(int type, unsigned long len,
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unsigned long flags, int pc);
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void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
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unsigned long flags, int pc);
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void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
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unsigned long flags, int pc);
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void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
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void tracing_record_cmdline(struct task_struct *tsk);
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struct ftrace_event_call {
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struct list_head list;
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char *name;
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char *system;
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struct dentry *dir;
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struct trace_event *event;
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int enabled;
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int (*regfunc)(void);
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void (*unregfunc)(void);
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int id;
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int (*raw_init)(void);
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int (*show_format)(struct trace_seq *s);
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int (*define_fields)(void);
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struct list_head fields;
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int n_preds;
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struct filter_pred **preds;
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void *mod;
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#ifdef CONFIG_EVENT_PROFILE
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atomic_t profile_count;
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int (*profile_enable)(struct ftrace_event_call *);
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void (*profile_disable)(struct ftrace_event_call *);
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#endif
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};
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#define MAX_FILTER_PRED 8
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#define MAX_FILTER_STR_VAL 128
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extern int init_preds(struct ftrace_event_call *call);
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extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
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extern int filter_current_check_discard(struct ftrace_event_call *call,
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void *rec,
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struct ring_buffer_event *event);
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extern int trace_define_field(struct ftrace_event_call *call, char *type,
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char *name, int offset, int size);
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/*
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* The double __builtin_constant_p is because gcc will give us an error
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* if we try to allocate the static variable to fmt if it is not a
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* constant. Even with the outer if statement optimizing out.
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*/
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#define event_trace_printk(ip, fmt, args...) \
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do { \
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__trace_printk_check_format(fmt, ##args); \
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tracing_record_cmdline(current); \
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if (__builtin_constant_p(fmt)) { \
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static const char *trace_printk_fmt \
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__attribute__((section("__trace_printk_fmt"))) = \
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__builtin_constant_p(fmt) ? fmt : NULL; \
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\
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__trace_bprintk(ip, trace_printk_fmt, ##args); \
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} else \
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__trace_printk(ip, fmt, ##args); \
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} while (0)
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#define __common_field(type, item) \
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ret = trace_define_field(event_call, #type, "common_" #item, \
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offsetof(typeof(field.ent), item), \
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sizeof(field.ent.item)); \
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if (ret) \
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return ret;
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#endif /* _LINUX_FTRACE_EVENT_H */
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