trace_output.c (2c1ed907520c50326b8f604907a8478b27881a2e) trace_output.c (533c20b062d7c25cbcbadb31e3ecb95a08ddb877)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 *
7 */
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11#include <linux/kprobes.h>
12#include <linux/sched/clock.h>
13#include <linux/sched/mm.h>
14#include <linux/idr.h>
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 *
7 */
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11#include <linux/kprobes.h>
12#include <linux/sched/clock.h>
13#include <linux/sched/mm.h>
14#include <linux/idr.h>
15#include <linux/btf.h>
16#include <linux/bpf.h>
15
16#include "trace_output.h"
17
18#include "trace_output.h"
19#include "trace_btf.h"
17
18/* must be a power of 2 */
19#define EVENT_HASHSIZE 128
20
21DECLARE_RWSEM(trace_event_sem);
22
23static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
24

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679 lat_print_generic(s, entry, iter->cpu);
680 }
681
682 lat_print_timestamp(iter, next_ts);
683
684 return !trace_seq_has_overflowed(s);
685}
686
20
21/* must be a power of 2 */
22#define EVENT_HASHSIZE 128
23
24DECLARE_RWSEM(trace_event_sem);
25
26static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
27

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682 lat_print_generic(s, entry, iter->cpu);
683 }
684
685 lat_print_timestamp(iter, next_ts);
686
687 return !trace_seq_has_overflowed(s);
688}
689
690#ifdef CONFIG_FUNCTION_TRACE_ARGS
691void print_function_args(struct trace_seq *s, unsigned long *args,
692 unsigned long func)
693{
694 const struct btf_param *param;
695 const struct btf_type *t;
696 const char *param_name;
697 char name[KSYM_NAME_LEN];
698 unsigned long arg;
699 struct btf *btf;
700 s32 tid, nr = 0;
701 int a, p, x;
702
703 trace_seq_printf(s, "(");
704
705 if (!args)
706 goto out;
707 if (lookup_symbol_name(func, name))
708 goto out;
709
710 /* TODO: Pass module name here too */
711 t = btf_find_func_proto(name, &btf);
712 if (IS_ERR_OR_NULL(t))
713 goto out;
714
715 param = btf_get_func_param(t, &nr);
716 if (!param)
717 goto out_put;
718
719 for (a = 0, p = 0; p < nr; a++, p++) {
720 if (p)
721 trace_seq_puts(s, ", ");
722
723 /* This only prints what the arch allows (6 args by default) */
724 if (a == FTRACE_REGS_MAX_ARGS) {
725 trace_seq_puts(s, "...");
726 break;
727 }
728
729 arg = args[a];
730
731 param_name = btf_name_by_offset(btf, param[p].name_off);
732 if (param_name)
733 trace_seq_printf(s, "%s=", param_name);
734 t = btf_type_skip_modifiers(btf, param[p].type, &tid);
735
736 switch (t ? BTF_INFO_KIND(t->info) : BTF_KIND_UNKN) {
737 case BTF_KIND_UNKN:
738 trace_seq_putc(s, '?');
739 /* Still print unknown type values */
740 fallthrough;
741 case BTF_KIND_PTR:
742 trace_seq_printf(s, "0x%lx", arg);
743 break;
744 case BTF_KIND_INT:
745 trace_seq_printf(s, "%ld", arg);
746 break;
747 case BTF_KIND_ENUM:
748 trace_seq_printf(s, "%ld", arg);
749 break;
750 default:
751 /* This does not handle complex arguments */
752 trace_seq_printf(s, "(%s)[0x%lx", btf_type_str(t), arg);
753 for (x = sizeof(long); x < t->size; x += sizeof(long)) {
754 trace_seq_putc(s, ':');
755 if (++a == FTRACE_REGS_MAX_ARGS) {
756 trace_seq_puts(s, "...]");
757 goto out_put;
758 }
759 trace_seq_printf(s, "0x%lx", args[a]);
760 }
761 trace_seq_putc(s, ']');
762 break;
763 }
764 }
765out_put:
766 btf_put(btf);
767out:
768 trace_seq_printf(s, ")");
769}
770#endif
771
687/**
688 * ftrace_find_event - find a registered event
689 * @type: the type of event to look for
690 *
691 * Returns an event of type @type otherwise NULL
692 * Called with trace_event_read_lock() held.
693 */
694struct trace_event *ftrace_find_event(int type)

--- 1057 unchanged lines hidden --- 		772/**
773 * ftrace_find_event - find a registered event
774 * @type: the type of event to look for
775 *
776 * Returns an event of type @type otherwise NULL
777 * Called with trace_event_read_lock() held.
778 */
779struct trace_event *ftrace_find_event(int type)

--- 1057 unchanged lines hidden ---