f633cef020
Impact: rework trace.c to use new event register API Almost every ftrace event has to implement its output display in trace.c through a different function. Some events did not handle all the formats (trace, latency-trace, raw, hex, binary), and this method does not scale well. This patch converts the format functions to use the event API to find the event and and print its format. Currently, we have a print function for trace, latency_trace, raw, hex and binary. A trace_nop_print is available if the event wants to avoid output on a particular format. Perhaps other tracers could use this in the future (like mmiotrace and function_graph). Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
#ifndef __TRACE_EVENTS_H
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#define __TRACE_EVENTS_H
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#include "trace.h"
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typedef int (*trace_print_func)(struct trace_seq *s, struct trace_entry *entry,
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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 latency_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 trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
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extern int
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seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
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unsigned long sym_flags);
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extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
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size_t cnt);
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int trace_seq_puts(struct trace_seq *s, const char *str);
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int trace_seq_putc(struct trace_seq *s, unsigned char c);
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int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
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int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
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int trace_seq_path(struct trace_seq *s, struct path *path);
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int seq_print_userip_objs(const struct userstack_entry *entry,
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struct trace_seq *s, unsigned long sym_flags);
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int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
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unsigned long ip, unsigned long sym_flags);
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struct trace_event *ftrace_find_event(int type);
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int register_ftrace_event(struct trace_event *event);
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int unregister_ftrace_event(struct trace_event *event);
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int
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trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags);
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#define MAX_MEMHEX_BYTES 8
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#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
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#define SEQ_PUT_FIELD_RET(s, x) \
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do { \
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if (!trace_seq_putmem(s, &(x), sizeof(x))) \
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return 0; \
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} while (0)
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#define SEQ_PUT_HEX_FIELD_RET(s, x) \
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do { \
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BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
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if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
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return 0; \
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} while (0)
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#endif
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