linux/kernel/trace/trace_event_perf.c

// SPDX-License-Identifier: GPL-2.0
/*
 * trace event based perf event profiling/tracing
 *
 * Copyright (C) 2009 Red Hat Inc, Peter Zijlstra
 * Copyright (C) 2009-2010 Frederic Weisbecker <[email protected]>
 */

#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/security.h>
#include "trace.h"
#include "trace_probe.h"

static char __percpu *perf_trace_buf[PERF_NR_CONTEXTS];

/*
 * Force it to be aligned to unsigned long to avoid misaligned accesses
 * surprises
 */
perf_trace_t;

/* Count the events in use (per event id, not per instance) */
static int	total_ref_count;

static int perf_trace_event_perm(struct trace_event_call *tp_event,
				 struct perf_event *p_event)
{ … }

static int perf_trace_event_reg(struct trace_event_call *tp_event,
				struct perf_event *p_event)
{ … }

static void perf_trace_event_unreg(struct perf_event *p_event)
{ … }

static int perf_trace_event_open(struct perf_event *p_event)
{ … }

static void perf_trace_event_close(struct perf_event *p_event)
{ … }

static int perf_trace_event_init(struct trace_event_call *tp_event,
				 struct perf_event *p_event)
{ … }

int perf_trace_init(struct perf_event *p_event)
{ … }

void perf_trace_destroy(struct perf_event *p_event)
{ … }

#ifdef CONFIG_KPROBE_EVENTS
int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe)
{ … }

void perf_kprobe_destroy(struct perf_event *p_event)
{ … }
#endif /* CONFIG_KPROBE_EVENTS */

#ifdef CONFIG_UPROBE_EVENTS
int perf_uprobe_init(struct perf_event *p_event,
		     unsigned long ref_ctr_offset, bool is_retprobe)
{ … }

void perf_uprobe_destroy(struct perf_event *p_event)
{ … }
#endif /* CONFIG_UPROBE_EVENTS */

int perf_trace_add(struct perf_event *p_event, int flags)
{ … }

void perf_trace_del(struct perf_event *p_event, int flags)
{ … }

void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp)
{ … }
EXPORT_SYMBOL_GPL(…);
NOKPROBE_SYMBOL(perf_trace_buf_alloc);

void perf_trace_buf_update(void *record, u16 type)
{ … }
NOKPROBE_SYMBOL(perf_trace_buf_update);

#ifdef CONFIG_FUNCTION_TRACER
static void
perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
			  struct ftrace_ops *ops,  struct ftrace_regs *fregs)
{ … }

static int perf_ftrace_function_register(struct perf_event *event)
{ … }

static int perf_ftrace_function_unregister(struct perf_event *event)
{ … }

int perf_ftrace_event_register(struct trace_event_call *call,
			       enum trace_reg type, void *data)
{ … }
#endif /* CONFIG_FUNCTION_TRACER */