// SPDX-License-Identifier: GPL-2.0 /* * * Function graph tracer. * Copyright (c) 2008-2009 Frederic Weisbecker <[email protected]> * Mostly borrowed from function tracer which * is Copyright (c) Steven Rostedt <[email protected]> * */ #include <linux/uaccess.h> #include <linux/ftrace.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/fs.h> #include "trace.h" #include "trace_output.h" /* When set, irq functions will be ignored */ static int ftrace_graph_skip_irqs; struct fgraph_cpu_data { … }; struct fgraph_data { … }; #define TRACE_GRAPH_INDENT … unsigned int fgraph_max_depth; static struct tracer_opt trace_opts[] = …; static struct tracer_flags tracer_flags = …; /* * DURATION column is being also used to display IRQ signs, * following values are used by print_graph_irq and others * to fill in space into DURATION column. */ enum { … }; static void print_graph_duration(struct trace_array *tr, unsigned long long duration, struct trace_seq *s, u32 flags); int __trace_graph_entry(struct trace_array *tr, struct ftrace_graph_ent *trace, unsigned int trace_ctx) { … } static inline int ftrace_graph_ignore_irqs(void) { … } int trace_graph_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops) { … } static void __trace_graph_function(struct trace_array *tr, unsigned long ip, unsigned int trace_ctx) { … } void trace_graph_function(struct trace_array *tr, unsigned long ip, unsigned long parent_ip, unsigned int trace_ctx) { … } void __trace_graph_return(struct trace_array *tr, struct ftrace_graph_ret *trace, unsigned int trace_ctx) { … } void trace_graph_return(struct ftrace_graph_ret *trace, struct fgraph_ops *gops) { … } static void trace_graph_thresh_return(struct ftrace_graph_ret *trace, struct fgraph_ops *gops) { … } static struct fgraph_ops funcgraph_ops = …; int allocate_fgraph_ops(struct trace_array *tr, struct ftrace_ops *ops) { … } void free_fgraph_ops(struct trace_array *tr) { … } __init void init_array_fgraph_ops(struct trace_array *tr, struct ftrace_ops *ops) { … } static int graph_trace_init(struct trace_array *tr) { … } static void graph_trace_reset(struct trace_array *tr) { … } static int graph_trace_update_thresh(struct trace_array *tr) { … } static int max_bytes_for_cpu; static void print_graph_cpu(struct trace_seq *s, int cpu) { … } #define TRACE_GRAPH_PROCINFO_LENGTH … static void print_graph_proc(struct trace_seq *s, pid_t pid) { … } static void print_graph_lat_fmt(struct trace_seq *s, struct trace_entry *entry) { … } /* If the pid changed since the last trace, output this event */ static void verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data) { … } static struct ftrace_graph_ret_entry * get_return_for_leaf(struct trace_iterator *iter, struct ftrace_graph_ent_entry *curr) { … } static void print_graph_abs_time(u64 t, struct trace_seq *s) { … } static void print_graph_rel_time(struct trace_iterator *iter, struct trace_seq *s) { … } static void print_graph_irq(struct trace_iterator *iter, unsigned long addr, enum trace_type type, int cpu, pid_t pid, u32 flags) { … } void trace_print_graph_duration(unsigned long long duration, struct trace_seq *s) { … } static void print_graph_duration(struct trace_array *tr, unsigned long long duration, struct trace_seq *s, u32 flags) { … } #ifdef CONFIG_FUNCTION_GRAPH_RETVAL #define __TRACE_GRAPH_PRINT_RETVAL … static void print_graph_retval(struct trace_seq *s, unsigned long retval, bool leaf, void *func, bool hex_format) { … } #else #define __TRACE_GRAPH_PRINT_RETVAL … #define print_graph_retval … #endif /* Case of a leaf function on its call entry */ static enum print_line_t print_graph_entry_leaf(struct trace_iterator *iter, struct ftrace_graph_ent_entry *entry, struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s, u32 flags) { … } static enum print_line_t print_graph_entry_nested(struct trace_iterator *iter, struct ftrace_graph_ent_entry *entry, struct trace_seq *s, int cpu, u32 flags) { … } static void print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s, int type, unsigned long addr, u32 flags) { … } /* * Entry check for irq code * * returns 1 if * - we are inside irq code * - we just entered irq code * * returns 0 if * - funcgraph-interrupts option is set * - we are not inside irq code */ static int check_irq_entry(struct trace_iterator *iter, u32 flags, unsigned long addr, int depth) { … } /* * Return check for irq code * * returns 1 if * - we are inside irq code * - we just left irq code * * returns 0 if * - funcgraph-interrupts option is set * - we are not inside irq code */ static int check_irq_return(struct trace_iterator *iter, u32 flags, int depth) { … } static enum print_line_t print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s, struct trace_iterator *iter, u32 flags) { … } static enum print_line_t print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s, struct trace_entry *ent, struct trace_iterator *iter, u32 flags) { … } static enum print_line_t print_graph_comment(struct trace_seq *s, struct trace_entry *ent, struct trace_iterator *iter, u32 flags) { … } enum print_line_t print_graph_function_flags(struct trace_iterator *iter, u32 flags) { … } static enum print_line_t print_graph_function(struct trace_iterator *iter) { … } static enum print_line_t print_graph_function_event(struct trace_iterator *iter, int flags, struct trace_event *event) { … } static void print_lat_header(struct seq_file *s, u32 flags) { … } static void __print_graph_headers_flags(struct trace_array *tr, struct seq_file *s, u32 flags) { … } static void print_graph_headers(struct seq_file *s) { … } void print_graph_headers_flags(struct seq_file *s, u32 flags) { … } void graph_trace_open(struct trace_iterator *iter) { … } void graph_trace_close(struct trace_iterator *iter) { … } static int func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) { … } static struct trace_event_functions graph_functions = …; static struct trace_event graph_trace_entry_event = …; static struct trace_event graph_trace_ret_event = …; static struct tracer graph_trace __tracer_data = …; static ssize_t graph_depth_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { … } static ssize_t graph_depth_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { … } static const struct file_operations graph_depth_fops = …; static __init int init_graph_tracefs(void) { … } fs_initcall(init_graph_tracefs); static __init int init_graph_trace(void) { … } core_initcall(init_graph_trace);
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