939 lines
29 KiB
C
939 lines
29 KiB
C
/*
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* Ftrace header. For implementation details beyond the random comments
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* scattered below, see: Documentation/trace/ftrace-design.txt
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*/
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#ifndef _LINUX_FTRACE_H
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#define _LINUX_FTRACE_H
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#include <linux/trace_clock.h>
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#include <linux/kallsyms.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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#include <linux/ptrace.h>
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#include <linux/ktime.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <asm/ftrace.h>
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/*
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* If the arch supports passing the variable contents of
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* function_trace_op as the third parameter back from the
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* mcount call, then the arch should define this as 1.
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*/
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#ifndef ARCH_SUPPORTS_FTRACE_OPS
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#define ARCH_SUPPORTS_FTRACE_OPS 0
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#endif
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/*
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* If the arch's mcount caller does not support all of ftrace's
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* features, then it must call an indirect function that
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* does. Or at least does enough to prevent any unwelcomed side effects.
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*/
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#if !ARCH_SUPPORTS_FTRACE_OPS
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# define FTRACE_FORCE_LIST_FUNC 1
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#else
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# define FTRACE_FORCE_LIST_FUNC 0
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#endif
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/* Main tracing buffer and events set up */
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#ifdef CONFIG_TRACING
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void trace_init(void);
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#else
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static inline void trace_init(void) { }
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#endif
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struct module;
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struct ftrace_hash;
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#ifdef CONFIG_FUNCTION_TRACER
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extern int ftrace_enabled;
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extern int
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ftrace_enable_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos);
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struct ftrace_ops;
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typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
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struct ftrace_ops *op, struct pt_regs *regs);
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ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
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/*
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* FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
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* set in the flags member.
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* CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and
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* IPMODIFY are a kind of attribute flags which can be set only before
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* registering the ftrace_ops, and can not be modified while registered.
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* Changing those attribute flags after regsitering ftrace_ops will
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* cause unexpected results.
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*
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* ENABLED - set/unset when ftrace_ops is registered/unregistered
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* DYNAMIC - set when ftrace_ops is registered to denote dynamically
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* allocated ftrace_ops which need special care
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* PER_CPU - set manualy by ftrace_ops user to denote the ftrace_ops
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* could be controlled by following calls:
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* ftrace_function_local_enable
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* ftrace_function_local_disable
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* SAVE_REGS - The ftrace_ops wants regs saved at each function called
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* and passed to the callback. If this flag is set, but the
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* architecture does not support passing regs
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* (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
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* ftrace_ops will fail to register, unless the next flag
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* is set.
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* SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
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* handler can handle an arch that does not save regs
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* (the handler tests if regs == NULL), then it can set
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* this flag instead. It will not fail registering the ftrace_ops
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* but, the regs field will be NULL if the arch does not support
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* passing regs to the handler.
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* Note, if this flag is set, the SAVE_REGS flag will automatically
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* get set upon registering the ftrace_ops, if the arch supports it.
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* RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
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* that the call back has its own recursion protection. If it does
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* not set this, then the ftrace infrastructure will add recursion
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* protection for the caller.
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* STUB - The ftrace_ops is just a place holder.
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* INITIALIZED - The ftrace_ops has already been initialized (first use time
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* register_ftrace_function() is called, it will initialized the ops)
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* DELETED - The ops are being deleted, do not let them be registered again.
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* ADDING - The ops is in the process of being added.
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* REMOVING - The ops is in the process of being removed.
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* MODIFYING - The ops is in the process of changing its filter functions.
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* ALLOC_TRAMP - A dynamic trampoline was allocated by the core code.
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* The arch specific code sets this flag when it allocated a
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* trampoline. This lets the arch know that it can update the
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* trampoline in case the callback function changes.
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* The ftrace_ops trampoline can be set by the ftrace users, and
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* in such cases the arch must not modify it. Only the arch ftrace
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* core code should set this flag.
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* IPMODIFY - The ops can modify the IP register. This can only be set with
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* SAVE_REGS. If another ops with this flag set is already registered
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* for any of the functions that this ops will be registered for, then
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* this ops will fail to register or set_filter_ip.
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* PID - Is affected by set_ftrace_pid (allows filtering on those pids)
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*/
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enum {
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FTRACE_OPS_FL_ENABLED = 1 << 0,
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FTRACE_OPS_FL_DYNAMIC = 1 << 1,
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FTRACE_OPS_FL_PER_CPU = 1 << 2,
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FTRACE_OPS_FL_SAVE_REGS = 1 << 3,
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FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4,
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FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5,
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FTRACE_OPS_FL_STUB = 1 << 6,
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FTRACE_OPS_FL_INITIALIZED = 1 << 7,
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FTRACE_OPS_FL_DELETED = 1 << 8,
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FTRACE_OPS_FL_ADDING = 1 << 9,
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FTRACE_OPS_FL_REMOVING = 1 << 10,
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FTRACE_OPS_FL_MODIFYING = 1 << 11,
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FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12,
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FTRACE_OPS_FL_IPMODIFY = 1 << 13,
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FTRACE_OPS_FL_PID = 1 << 14,
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FTRACE_OPS_FL_RCU = 1 << 15,
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};
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#ifdef CONFIG_DYNAMIC_FTRACE
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/* The hash used to know what functions callbacks trace */
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struct ftrace_ops_hash {
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struct ftrace_hash *notrace_hash;
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struct ftrace_hash *filter_hash;
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struct mutex regex_lock;
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};
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#endif
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/*
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* Note, ftrace_ops can be referenced outside of RCU protection, unless
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* the RCU flag is set. If ftrace_ops is allocated and not part of kernel
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* core data, the unregistering of it will perform a scheduling on all CPUs
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* to make sure that there are no more users. Depending on the load of the
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* system that may take a bit of time.
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*
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* Any private data added must also take care not to be freed and if private
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* data is added to a ftrace_ops that is in core code, the user of the
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* ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
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*/
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struct ftrace_ops {
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ftrace_func_t func;
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struct ftrace_ops *next;
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unsigned long flags;
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void *private;
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ftrace_func_t saved_func;
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int __percpu *disabled;
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#ifdef CONFIG_DYNAMIC_FTRACE
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int nr_trampolines;
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struct ftrace_ops_hash local_hash;
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struct ftrace_ops_hash *func_hash;
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struct ftrace_ops_hash old_hash;
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unsigned long trampoline;
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unsigned long trampoline_size;
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#endif
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};
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/*
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* Type of the current tracing.
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*/
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enum ftrace_tracing_type_t {
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FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
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FTRACE_TYPE_RETURN, /* Hook the return of the function */
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};
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/* Current tracing type, default is FTRACE_TYPE_ENTER */
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extern enum ftrace_tracing_type_t ftrace_tracing_type;
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/*
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* The ftrace_ops must be a static and should also
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* be read_mostly. These functions do modify read_mostly variables
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* so use them sparely. Never free an ftrace_op or modify the
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* next pointer after it has been registered. Even after unregistering
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* it, the next pointer may still be used internally.
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*/
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int register_ftrace_function(struct ftrace_ops *ops);
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int unregister_ftrace_function(struct ftrace_ops *ops);
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void clear_ftrace_function(void);
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/**
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* ftrace_function_local_enable - enable ftrace_ops on current cpu
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*
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* This function enables tracing on current cpu by decreasing
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* the per cpu control variable.
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* It must be called with preemption disabled and only on ftrace_ops
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* registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
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* disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
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*/
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static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
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{
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if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
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return;
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(*this_cpu_ptr(ops->disabled))--;
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}
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/**
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* ftrace_function_local_disable - disable ftrace_ops on current cpu
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*
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* This function disables tracing on current cpu by increasing
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* the per cpu control variable.
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* It must be called with preemption disabled and only on ftrace_ops
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* registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
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* disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
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*/
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static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
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{
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if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
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return;
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(*this_cpu_ptr(ops->disabled))++;
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}
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/**
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* ftrace_function_local_disabled - returns ftrace_ops disabled value
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* on current cpu
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*
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* This function returns value of ftrace_ops::disabled on current cpu.
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* It must be called with preemption disabled and only on ftrace_ops
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* registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
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* disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
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*/
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static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
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{
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WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU));
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return *this_cpu_ptr(ops->disabled);
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}
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extern void ftrace_stub(unsigned long a0, unsigned long a1,
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struct ftrace_ops *op, struct pt_regs *regs);
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#else /* !CONFIG_FUNCTION_TRACER */
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/*
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* (un)register_ftrace_function must be a macro since the ops parameter
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* must not be evaluated.
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*/
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#define register_ftrace_function(ops) ({ 0; })
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#define unregister_ftrace_function(ops) ({ 0; })
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static inline int ftrace_nr_registered_ops(void)
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{
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return 0;
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}
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static inline void clear_ftrace_function(void) { }
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static inline void ftrace_kill(void) { }
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#endif /* CONFIG_FUNCTION_TRACER */
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#ifdef CONFIG_STACK_TRACER
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#define STACK_TRACE_ENTRIES 500
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struct stack_trace;
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extern unsigned stack_trace_index[];
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extern struct stack_trace stack_trace_max;
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extern unsigned long stack_trace_max_size;
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extern arch_spinlock_t stack_trace_max_lock;
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extern int stack_tracer_enabled;
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void stack_trace_print(void);
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int
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stack_trace_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos);
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#endif
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struct ftrace_func_command {
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struct list_head list;
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char *name;
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int (*func)(struct ftrace_hash *hash,
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char *func, char *cmd,
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char *params, int enable);
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};
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#ifdef CONFIG_DYNAMIC_FTRACE
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int ftrace_arch_code_modify_prepare(void);
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int ftrace_arch_code_modify_post_process(void);
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struct dyn_ftrace;
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enum ftrace_bug_type {
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FTRACE_BUG_UNKNOWN,
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FTRACE_BUG_INIT,
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FTRACE_BUG_NOP,
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FTRACE_BUG_CALL,
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FTRACE_BUG_UPDATE,
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};
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extern enum ftrace_bug_type ftrace_bug_type;
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/*
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* Archs can set this to point to a variable that holds the value that was
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* expected at the call site before calling ftrace_bug().
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*/
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extern const void *ftrace_expected;
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void ftrace_bug(int err, struct dyn_ftrace *rec);
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struct seq_file;
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struct ftrace_probe_ops {
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void (*func)(unsigned long ip,
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unsigned long parent_ip,
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void **data);
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int (*init)(struct ftrace_probe_ops *ops,
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unsigned long ip, void **data);
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void (*free)(struct ftrace_probe_ops *ops,
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unsigned long ip, void **data);
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int (*print)(struct seq_file *m,
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unsigned long ip,
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struct ftrace_probe_ops *ops,
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void *data);
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};
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extern int
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register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
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void *data);
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extern void
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unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
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void *data);
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extern void
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unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
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extern void unregister_ftrace_function_probe_all(char *glob);
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extern int ftrace_text_reserved(const void *start, const void *end);
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extern int ftrace_nr_registered_ops(void);
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bool is_ftrace_trampoline(unsigned long addr);
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/*
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* The dyn_ftrace record's flags field is split into two parts.
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* the first part which is '0-FTRACE_REF_MAX' is a counter of
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* the number of callbacks that have registered the function that
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* the dyn_ftrace descriptor represents.
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*
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* The second part is a mask:
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* ENABLED - the function is being traced
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* REGS - the record wants the function to save regs
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* REGS_EN - the function is set up to save regs.
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* IPMODIFY - the record allows for the IP address to be changed.
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* DISABLED - the record is not ready to be touched yet
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*
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* When a new ftrace_ops is registered and wants a function to save
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* pt_regs, the rec->flag REGS is set. When the function has been
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* set up to save regs, the REG_EN flag is set. Once a function
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* starts saving regs it will do so until all ftrace_ops are removed
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* from tracing that function.
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*/
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enum {
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FTRACE_FL_ENABLED = (1UL << 31),
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FTRACE_FL_REGS = (1UL << 30),
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FTRACE_FL_REGS_EN = (1UL << 29),
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FTRACE_FL_TRAMP = (1UL << 28),
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FTRACE_FL_TRAMP_EN = (1UL << 27),
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FTRACE_FL_IPMODIFY = (1UL << 26),
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FTRACE_FL_DISABLED = (1UL << 25),
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};
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#define FTRACE_REF_MAX_SHIFT 25
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#define FTRACE_FL_BITS 7
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#define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1)
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#define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
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#define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
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#define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
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struct dyn_ftrace {
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unsigned long ip; /* address of mcount call-site */
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unsigned long flags;
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struct dyn_arch_ftrace arch;
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};
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int ftrace_force_update(void);
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int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
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int remove, int reset);
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int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
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int len, int reset);
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int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
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int len, int reset);
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void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
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void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
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void ftrace_free_filter(struct ftrace_ops *ops);
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int register_ftrace_command(struct ftrace_func_command *cmd);
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int unregister_ftrace_command(struct ftrace_func_command *cmd);
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enum {
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FTRACE_UPDATE_CALLS = (1 << 0),
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FTRACE_DISABLE_CALLS = (1 << 1),
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FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
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FTRACE_START_FUNC_RET = (1 << 3),
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FTRACE_STOP_FUNC_RET = (1 << 4),
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};
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/*
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* The FTRACE_UPDATE_* enum is used to pass information back
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* from the ftrace_update_record() and ftrace_test_record()
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* functions. These are called by the code update routines
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* to find out what is to be done for a given function.
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*
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* IGNORE - The function is already what we want it to be
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* MAKE_CALL - Start tracing the function
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* MODIFY_CALL - Stop saving regs for the function
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* MAKE_NOP - Stop tracing the function
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*/
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enum {
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FTRACE_UPDATE_IGNORE,
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FTRACE_UPDATE_MAKE_CALL,
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FTRACE_UPDATE_MODIFY_CALL,
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FTRACE_UPDATE_MAKE_NOP,
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};
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enum {
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FTRACE_ITER_FILTER = (1 << 0),
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FTRACE_ITER_NOTRACE = (1 << 1),
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FTRACE_ITER_PRINTALL = (1 << 2),
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FTRACE_ITER_DO_HASH = (1 << 3),
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FTRACE_ITER_HASH = (1 << 4),
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FTRACE_ITER_ENABLED = (1 << 5),
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};
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void arch_ftrace_update_code(int command);
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struct ftrace_rec_iter;
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struct ftrace_rec_iter *ftrace_rec_iter_start(void);
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struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
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struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
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#define for_ftrace_rec_iter(iter) \
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for (iter = ftrace_rec_iter_start(); \
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iter; \
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iter = ftrace_rec_iter_next(iter))
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int ftrace_update_record(struct dyn_ftrace *rec, int enable);
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int ftrace_test_record(struct dyn_ftrace *rec, int enable);
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void ftrace_run_stop_machine(int command);
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unsigned long ftrace_location(unsigned long ip);
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unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);
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unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
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extern ftrace_func_t ftrace_trace_function;
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int ftrace_regex_open(struct ftrace_ops *ops, int flag,
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struct inode *inode, struct file *file);
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ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
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size_t cnt, loff_t *ppos);
|
|
ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
|
|
size_t cnt, loff_t *ppos);
|
|
int ftrace_regex_release(struct inode *inode, struct file *file);
|
|
|
|
void __init
|
|
ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
|
|
|
|
/* defined in arch */
|
|
extern int ftrace_ip_converted(unsigned long ip);
|
|
extern int ftrace_dyn_arch_init(void);
|
|
extern void ftrace_replace_code(int enable);
|
|
extern int ftrace_update_ftrace_func(ftrace_func_t func);
|
|
extern void ftrace_caller(void);
|
|
extern void ftrace_regs_caller(void);
|
|
extern void ftrace_call(void);
|
|
extern void ftrace_regs_call(void);
|
|
extern void mcount_call(void);
|
|
|
|
void ftrace_modify_all_code(int command);
|
|
|
|
#ifndef FTRACE_ADDR
|
|
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
|
|
#endif
|
|
|
|
#ifndef FTRACE_GRAPH_ADDR
|
|
#define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller)
|
|
#endif
|
|
|
|
#ifndef FTRACE_REGS_ADDR
|
|
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
|
|
# define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
|
|
#else
|
|
# define FTRACE_REGS_ADDR FTRACE_ADDR
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* If an arch would like functions that are only traced
|
|
* by the function graph tracer to jump directly to its own
|
|
* trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR
|
|
* to be that address to jump to.
|
|
*/
|
|
#ifndef FTRACE_GRAPH_TRAMP_ADDR
|
|
#define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
extern void ftrace_graph_caller(void);
|
|
extern int ftrace_enable_ftrace_graph_caller(void);
|
|
extern int ftrace_disable_ftrace_graph_caller(void);
|
|
#else
|
|
static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
|
|
static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
|
|
#endif
|
|
|
|
/**
|
|
* ftrace_make_nop - convert code into nop
|
|
* @mod: module structure if called by module load initialization
|
|
* @rec: the mcount call site record
|
|
* @addr: the address that the call site should be calling
|
|
*
|
|
* This is a very sensitive operation and great care needs
|
|
* to be taken by the arch. The operation should carefully
|
|
* read the location, check to see if what is read is indeed
|
|
* what we expect it to be, and then on success of the compare,
|
|
* it should write to the location.
|
|
*
|
|
* The code segment at @rec->ip should be a caller to @addr
|
|
*
|
|
* Return must be:
|
|
* 0 on success
|
|
* -EFAULT on error reading the location
|
|
* -EINVAL on a failed compare of the contents
|
|
* -EPERM on error writing to the location
|
|
* Any other value will be considered a failure.
|
|
*/
|
|
extern int ftrace_make_nop(struct module *mod,
|
|
struct dyn_ftrace *rec, unsigned long addr);
|
|
|
|
/**
|
|
* ftrace_make_call - convert a nop call site into a call to addr
|
|
* @rec: the mcount call site record
|
|
* @addr: the address that the call site should call
|
|
*
|
|
* This is a very sensitive operation and great care needs
|
|
* to be taken by the arch. The operation should carefully
|
|
* read the location, check to see if what is read is indeed
|
|
* what we expect it to be, and then on success of the compare,
|
|
* it should write to the location.
|
|
*
|
|
* The code segment at @rec->ip should be a nop
|
|
*
|
|
* Return must be:
|
|
* 0 on success
|
|
* -EFAULT on error reading the location
|
|
* -EINVAL on a failed compare of the contents
|
|
* -EPERM on error writing to the location
|
|
* Any other value will be considered a failure.
|
|
*/
|
|
extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
|
|
/**
|
|
* ftrace_modify_call - convert from one addr to another (no nop)
|
|
* @rec: the mcount call site record
|
|
* @old_addr: the address expected to be currently called to
|
|
* @addr: the address to change to
|
|
*
|
|
* This is a very sensitive operation and great care needs
|
|
* to be taken by the arch. The operation should carefully
|
|
* read the location, check to see if what is read is indeed
|
|
* what we expect it to be, and then on success of the compare,
|
|
* it should write to the location.
|
|
*
|
|
* The code segment at @rec->ip should be a caller to @old_addr
|
|
*
|
|
* Return must be:
|
|
* 0 on success
|
|
* -EFAULT on error reading the location
|
|
* -EINVAL on a failed compare of the contents
|
|
* -EPERM on error writing to the location
|
|
* Any other value will be considered a failure.
|
|
*/
|
|
extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
|
|
unsigned long addr);
|
|
#else
|
|
/* Should never be called */
|
|
static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
|
|
unsigned long addr)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/* May be defined in arch */
|
|
extern int ftrace_arch_read_dyn_info(char *buf, int size);
|
|
|
|
extern int skip_trace(unsigned long ip);
|
|
extern void ftrace_module_init(struct module *mod);
|
|
extern void ftrace_release_mod(struct module *mod);
|
|
|
|
extern void ftrace_disable_daemon(void);
|
|
extern void ftrace_enable_daemon(void);
|
|
#else /* CONFIG_DYNAMIC_FTRACE */
|
|
static inline int skip_trace(unsigned long ip) { return 0; }
|
|
static inline int ftrace_force_update(void) { return 0; }
|
|
static inline void ftrace_disable_daemon(void) { }
|
|
static inline void ftrace_enable_daemon(void) { }
|
|
static inline void ftrace_release_mod(struct module *mod) {}
|
|
static inline void ftrace_module_init(struct module *mod) {}
|
|
static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
static inline __init int unregister_ftrace_command(char *cmd_name)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
static inline int ftrace_text_reserved(const void *start, const void *end)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline unsigned long ftrace_location(unsigned long ip)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Again users of functions that have ftrace_ops may not
|
|
* have them defined when ftrace is not enabled, but these
|
|
* functions may still be called. Use a macro instead of inline.
|
|
*/
|
|
#define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
|
|
#define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
|
|
#define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
|
|
#define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
|
|
#define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
|
|
#define ftrace_free_filter(ops) do { } while (0)
|
|
|
|
static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
|
|
size_t cnt, loff_t *ppos) { return -ENODEV; }
|
|
static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
|
|
size_t cnt, loff_t *ppos) { return -ENODEV; }
|
|
static inline int
|
|
ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
|
|
|
|
static inline bool is_ftrace_trampoline(unsigned long addr)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
|
|
/* totally disable ftrace - can not re-enable after this */
|
|
void ftrace_kill(void);
|
|
|
|
static inline void tracer_disable(void)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
ftrace_enabled = 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Ftrace disable/restore without lock. Some synchronization mechanism
|
|
* must be used to prevent ftrace_enabled to be changed between
|
|
* disable/restore.
|
|
*/
|
|
static inline int __ftrace_enabled_save(void)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
int saved_ftrace_enabled = ftrace_enabled;
|
|
ftrace_enabled = 0;
|
|
return saved_ftrace_enabled;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static inline void __ftrace_enabled_restore(int enabled)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
ftrace_enabled = enabled;
|
|
#endif
|
|
}
|
|
|
|
/* All archs should have this, but we define it for consistency */
|
|
#ifndef ftrace_return_address0
|
|
# define ftrace_return_address0 __builtin_return_address(0)
|
|
#endif
|
|
|
|
/* Archs may use other ways for ADDR1 and beyond */
|
|
#ifndef ftrace_return_address
|
|
# ifdef CONFIG_FRAME_POINTER
|
|
# define ftrace_return_address(n) __builtin_return_address(n)
|
|
# else
|
|
# define ftrace_return_address(n) 0UL
|
|
# endif
|
|
#endif
|
|
|
|
#define CALLER_ADDR0 ((unsigned long)ftrace_return_address0)
|
|
#define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
|
|
#define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
|
|
#define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3))
|
|
#define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4))
|
|
#define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
|
|
#define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
|
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
|
|
extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
|
|
#else
|
|
static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
|
|
static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
extern void trace_preempt_on(unsigned long a0, unsigned long a1);
|
|
extern void trace_preempt_off(unsigned long a0, unsigned long a1);
|
|
#else
|
|
/*
|
|
* Use defines instead of static inlines because some arches will make code out
|
|
* of the CALLER_ADDR, when we really want these to be a real nop.
|
|
*/
|
|
# define trace_preempt_on(a0, a1) do { } while (0)
|
|
# define trace_preempt_off(a0, a1) do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
|
extern void ftrace_init(void);
|
|
#else
|
|
static inline void ftrace_init(void) { }
|
|
#endif
|
|
|
|
/*
|
|
* Structure that defines an entry function trace.
|
|
*/
|
|
struct ftrace_graph_ent {
|
|
unsigned long func; /* Current function */
|
|
int depth;
|
|
};
|
|
|
|
/*
|
|
* Structure that defines a return function trace.
|
|
*/
|
|
struct ftrace_graph_ret {
|
|
unsigned long func; /* Current function */
|
|
unsigned long long calltime;
|
|
unsigned long long rettime;
|
|
/* Number of functions that overran the depth limit for current task */
|
|
unsigned long overrun;
|
|
int depth;
|
|
};
|
|
|
|
/* Type of the callback handlers for tracing function graph*/
|
|
typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
|
|
typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
/* for init task */
|
|
#define INIT_FTRACE_GRAPH .ret_stack = NULL,
|
|
|
|
/*
|
|
* Stack of return addresses for functions
|
|
* of a thread.
|
|
* Used in struct thread_info
|
|
*/
|
|
struct ftrace_ret_stack {
|
|
unsigned long ret;
|
|
unsigned long func;
|
|
unsigned long long calltime;
|
|
unsigned long long subtime;
|
|
unsigned long fp;
|
|
};
|
|
|
|
/*
|
|
* Primary handler of a function return.
|
|
* It relays on ftrace_return_to_handler.
|
|
* Defined in entry_32/64.S
|
|
*/
|
|
extern void return_to_handler(void);
|
|
|
|
extern int
|
|
ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
|
|
unsigned long frame_pointer);
|
|
|
|
/*
|
|
* Sometimes we don't want to trace a function with the function
|
|
* graph tracer but we want them to keep traced by the usual function
|
|
* tracer if the function graph tracer is not configured.
|
|
*/
|
|
#define __notrace_funcgraph notrace
|
|
|
|
/*
|
|
* We want to which function is an entrypoint of a hardirq.
|
|
* That will help us to put a signal on output.
|
|
*/
|
|
#define __irq_entry __attribute__((__section__(".irqentry.text")))
|
|
|
|
/* Limits of hardirq entrypoints */
|
|
extern char __irqentry_text_start[];
|
|
extern char __irqentry_text_end[];
|
|
|
|
#define FTRACE_NOTRACE_DEPTH 65536
|
|
#define FTRACE_RETFUNC_DEPTH 50
|
|
#define FTRACE_RETSTACK_ALLOC_SIZE 32
|
|
extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
|
|
trace_func_graph_ent_t entryfunc);
|
|
|
|
extern bool ftrace_graph_is_dead(void);
|
|
extern void ftrace_graph_stop(void);
|
|
|
|
/* The current handlers in use */
|
|
extern trace_func_graph_ret_t ftrace_graph_return;
|
|
extern trace_func_graph_ent_t ftrace_graph_entry;
|
|
|
|
extern void unregister_ftrace_graph(void);
|
|
|
|
extern void ftrace_graph_init_task(struct task_struct *t);
|
|
extern void ftrace_graph_exit_task(struct task_struct *t);
|
|
extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
|
|
|
|
static inline int task_curr_ret_stack(struct task_struct *t)
|
|
{
|
|
return t->curr_ret_stack;
|
|
}
|
|
|
|
static inline void pause_graph_tracing(void)
|
|
{
|
|
atomic_inc(¤t->tracing_graph_pause);
|
|
}
|
|
|
|
static inline void unpause_graph_tracing(void)
|
|
{
|
|
atomic_dec(¤t->tracing_graph_pause);
|
|
}
|
|
#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
#define __notrace_funcgraph
|
|
#define __irq_entry
|
|
#define INIT_FTRACE_GRAPH
|
|
|
|
static inline void ftrace_graph_init_task(struct task_struct *t) { }
|
|
static inline void ftrace_graph_exit_task(struct task_struct *t) { }
|
|
static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
|
|
|
|
static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
|
|
trace_func_graph_ent_t entryfunc)
|
|
{
|
|
return -1;
|
|
}
|
|
static inline void unregister_ftrace_graph(void) { }
|
|
|
|
static inline int task_curr_ret_stack(struct task_struct *tsk)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline void pause_graph_tracing(void) { }
|
|
static inline void unpause_graph_tracing(void) { }
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
#ifdef CONFIG_TRACING
|
|
|
|
/* flags for current->trace */
|
|
enum {
|
|
TSK_TRACE_FL_TRACE_BIT = 0,
|
|
TSK_TRACE_FL_GRAPH_BIT = 1,
|
|
};
|
|
enum {
|
|
TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
|
|
TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
|
|
};
|
|
|
|
static inline void set_tsk_trace_trace(struct task_struct *tsk)
|
|
{
|
|
set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
|
|
}
|
|
|
|
static inline void clear_tsk_trace_trace(struct task_struct *tsk)
|
|
{
|
|
clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
|
|
}
|
|
|
|
static inline int test_tsk_trace_trace(struct task_struct *tsk)
|
|
{
|
|
return tsk->trace & TSK_TRACE_FL_TRACE;
|
|
}
|
|
|
|
static inline void set_tsk_trace_graph(struct task_struct *tsk)
|
|
{
|
|
set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
|
|
}
|
|
|
|
static inline void clear_tsk_trace_graph(struct task_struct *tsk)
|
|
{
|
|
clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
|
|
}
|
|
|
|
static inline int test_tsk_trace_graph(struct task_struct *tsk)
|
|
{
|
|
return tsk->trace & TSK_TRACE_FL_GRAPH;
|
|
}
|
|
|
|
enum ftrace_dump_mode;
|
|
|
|
extern enum ftrace_dump_mode ftrace_dump_on_oops;
|
|
extern int tracepoint_printk;
|
|
|
|
extern void disable_trace_on_warning(void);
|
|
extern int __disable_trace_on_warning;
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
#define INIT_TRACE_RECURSION .trace_recursion = 0,
|
|
#endif
|
|
|
|
#else /* CONFIG_TRACING */
|
|
static inline void disable_trace_on_warning(void) { }
|
|
#endif /* CONFIG_TRACING */
|
|
|
|
#ifndef INIT_TRACE_RECURSION
|
|
#define INIT_TRACE_RECURSION
|
|
#endif
|
|
|
|
#ifdef CONFIG_FTRACE_SYSCALLS
|
|
|
|
unsigned long arch_syscall_addr(int nr);
|
|
|
|
#endif /* CONFIG_FTRACE_SYSCALLS */
|
|
|
|
#endif /* _LINUX_FTRACE_H */
|