#ifndef _LINUX_KERNEL_TRACE_H#define _LINUX_KERNEL_TRACE_H #include <linux/fs.h>#include <asm/atomic.h>#include <linux/sched.h>#include <linux/clocksource.h>#include <linux/ring_buffer.h>#include <linux/mmiotrace.h>#include <linux/ftrace.h>#include <trace/boot.h>#include <trace/kmemtrace.h>#include <trace/power.h> enum trace_type {	__TRACE_FIRST_TYPE = 0, 	TRACE_FN,	TRACE_CTX,	TRACE_WAKE,	TRACE_STACK,	TRACE_PRINT,	TRACE_BPRINT,	TRACE_SPECIAL,	TRACE_MMIO_RW,	TRACE_MMIO_MAP,	TRACE_BRANCH,	TRACE_BOOT_CALL,	TRACE_BOOT_RET,	TRACE_GRAPH_RET,	TRACE_GRAPH_ENT,	TRACE_USER_STACK,	TRACE_HW_BRANCHES,	TRACE_SYSCALL_ENTER,	TRACE_SYSCALL_EXIT,	TRACE_KMEM_ALLOC,	TRACE_KMEM_FREE,	TRACE_POWER,	TRACE_BLK, 	__TRACE_LAST_TYPE,}; /* * The trace entry - the most basic unit of tracing. This is what * is printed in the end as a single line in the trace output, such as: * *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter */struct trace_entry {	unsigned char		type;	unsigned char		flags;	unsigned char		preempt_count;	int			pid;	int			tgid;}; /* * Function trace entry - function address and parent function addres: */struct ftrace_entry {	struct trace_entry	ent;	unsigned long		ip;	unsigned long		parent_ip;}; /* Function call entry */struct ftrace_graph_ent_entry {	struct trace_entry		ent;	struct ftrace_graph_ent		graph_ent;}; /* Function return entry */struct ftrace_graph_ret_entry {	struct trace_entry		ent;	struct ftrace_graph_ret		ret;};extern struct tracer boot_tracer; /* * Context switch trace entry - which task (and prio) we switched from/to: */struct ctx_switch_entry {	struct trace_entry	ent;	unsigned int		prev_pid;	unsigned char		prev_prio;	unsigned char		prev_state;	unsigned int		next_pid;	unsigned char		next_prio;	unsigned char		next_state;	unsigned int		next_cpu;}; /* * Special (free-form) trace entry: */struct special_entry {	struct trace_entry	ent;	unsigned long		arg1;	unsigned long		arg2;	unsigned long		arg3;}; /* * Stack-trace entry: */ #define FTRACE_STACK_ENTRIES	8 struct stack_entry {	struct trace_entry	ent;	unsigned long		caller[FTRACE_STACK_ENTRIES];}; struct userstack_entry {	struct trace_entry	ent;	unsigned long		caller[FTRACE_STACK_ENTRIES];}; /* * trace_printk entry: */struct bprint_entry {	struct trace_entry	ent;	unsigned long		ip;	const char		*fmt;	u32			buf[];}; struct print_entry {	struct trace_entry	ent;	unsigned long		ip;	char			buf[];}; #define TRACE_OLD_SIZE		88 struct trace_field_cont {	unsigned char		type;	/* Temporary till we get rid of this completely */	char			buf[TRACE_OLD_SIZE - 1];}; struct trace_mmiotrace_rw {	struct trace_entry	ent;	struct mmiotrace_rw	rw;}; struct trace_mmiotrace_map {	struct trace_entry	ent;	struct mmiotrace_map	map;}; struct trace_boot_call {	struct trace_entry	ent;	struct boot_trace_call boot_call;}; struct trace_boot_ret {	struct trace_entry	ent;	struct boot_trace_ret boot_ret;}; #define TRACE_FUNC_SIZE 30#define TRACE_FILE_SIZE 20struct trace_branch {	struct trace_entry	ent;	unsigned	        line;	char			func[TRACE_FUNC_SIZE+1];	char			file[TRACE_FILE_SIZE+1];	char			correct;}; struct hw_branch_entry {	struct trace_entry	ent;	u64			from;	u64			to;}; struct trace_power {	struct trace_entry	ent;	struct power_trace	state_data;}; enum kmemtrace_type_id {	KMEMTRACE_TYPE_KMALLOC = 0,	/* kmalloc() or kfree(). */	KMEMTRACE_TYPE_CACHE,		/* kmem_cache_*(). */	KMEMTRACE_TYPE_PAGES,		/* __get_free_pages() and friends. */}; struct kmemtrace_alloc_entry {	struct trace_entry	ent;	enum kmemtrace_type_id type_id;	unsigned long call_site;	const void *ptr;	size_t bytes_req;	size_t bytes_alloc;	gfp_t gfp_flags;	int node;}; struct kmemtrace_free_entry {	struct trace_entry	ent;	enum kmemtrace_type_id type_id;	unsigned long call_site;	const void *ptr;}; struct syscall_trace_enter {	struct trace_entry	ent;	int			nr;	unsigned long		args[];}; struct syscall_trace_exit {	struct trace_entry	ent;	int			nr;	unsigned long		ret;};  /* * trace_flag_type is an enumeration that holds different * states when a trace occurs. These are: *  IRQS_OFF		- interrupts were disabled *  IRQS_NOSUPPORT	- arch does not support irqs_disabled_flags *  NEED_RESCED		- reschedule is requested *  HARDIRQ		- inside an interrupt handler *  SOFTIRQ		- inside a softirq handler */enum trace_flag_type {	TRACE_FLAG_IRQS_OFF		= 0x01,	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,	TRACE_FLAG_NEED_RESCHED		= 0x04,	TRACE_FLAG_HARDIRQ		= 0x08,	TRACE_FLAG_SOFTIRQ		= 0x10,}; #define TRACE_BUF_SIZE		1024 /* * The CPU trace array - it consists of thousands of trace entries * plus some other descriptor data: (for example which task started * the trace, etc.) */struct trace_array_cpu {	atomic_t		disabled;	void			*buffer_page;	/* ring buffer spare */ 	/* these fields get copied into max-trace: */	unsigned long		trace_idx;	unsigned long		overrun;	unsigned long		saved_latency;	unsigned long		critical_start;	unsigned long		critical_end;	unsigned long		critical_sequence;	unsigned long		nice;	unsigned long		policy;	unsigned long		rt_priority;	cycle_t			preempt_timestamp;	pid_t			pid;	uid_t			uid;	char			comm[TASK_COMM_LEN];}; struct trace_iterator; /* * The trace array - an array of per-CPU trace arrays. This is the * highest level data structure that individual tracers deal with. * They have on/off state as well: */struct trace_array {	struct ring_buffer	*buffer;	unsigned long		entries;	int			cpu;	cycle_t			time_start;	struct task_struct	*waiter;	struct trace_array_cpu	*data[NR_CPUS];}; #define FTRACE_CMP_TYPE(var, type) \	__builtin_types_compatible_p(typeof(var), type *) #undef IF_ASSIGN#define IF_ASSIGN(var, entry, etype, id)		\	if (FTRACE_CMP_TYPE(var, etype)) {		\		var = (typeof(var))(entry);		\		WARN_ON(id && (entry)->type != id);	\		break;					\	} /* Will cause compile errors if type is not found. */extern void __ftrace_bad_type(void); /* * The trace_assign_type is a verifier that the entry type is * the same as the type being assigned. To add new types simply * add a line with the following format: * * IF_ASSIGN(var, ent, type, id); * *  Where "type" is the trace type that includes the trace_entry *  as the "ent" item. And "id" is the trace identifier that is *  used in the trace_type enum. * *  If the type can have more than one id, then use zero. */#define trace_assign_type(var, ent)					\	do {								\		IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);	\		IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);	\		IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);	\		IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\		IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);	\		IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT);	\		IF_ASSIGN(var, ent, struct special_entry, 0);		\		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\			  TRACE_MMIO_RW);				\		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\			  TRACE_MMIO_MAP);				\		IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\		IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\		IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \		IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,	\			  TRACE_GRAPH_ENT);		\		IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,	\			  TRACE_GRAPH_RET);		\		IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\		IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \		IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,	\			  TRACE_KMEM_ALLOC);	\		IF_ASSIGN(var, ent, struct kmemtrace_free_entry,	\			  TRACE_KMEM_FREE);	\		IF_ASSIGN(var, ent, struct syscall_trace_enter,		\			  TRACE_SYSCALL_ENTER);				\		IF_ASSIGN(var, ent, struct syscall_trace_exit,		\			  TRACE_SYSCALL_EXIT);				\		__ftrace_bad_type();					\	} while (0) /* Return values for print_line callback */enum print_line_t {	TRACE_TYPE_PARTIAL_LINE	= 0,	/* Retry after flushing the seq */	TRACE_TYPE_HANDLED	= 1,	TRACE_TYPE_UNHANDLED	= 2,	/* Relay to other output functions */	TRACE_TYPE_NO_CONSUME	= 3	/* Handled but ask to not consume */};  /* * An option specific to a tracer. This is a boolean value. * The bit is the bit index that sets its value on the * flags value in struct tracer_flags. */struct tracer_opt {	const char	*name; /* Will appear on the trace_options file */	u32		bit; /* Mask assigned in val field in tracer_flags */}; /* * The set of specific options for a tracer. Your tracer * have to set the initial value of the flags val. */struct tracer_flags {	u32			val;	struct tracer_opt	*opts;}; /* Makes more easy to define a tracer opt */#define TRACER_OPT(s, b)	.name = #s, .bit = b  /** * struct tracer - a specific tracer and its callbacks to interact with debugfs * @name: the name chosen to select it on the available_tracers file * @init: called when one switches to this tracer (echo name > current_tracer) * @reset: called when one switches to another tracer * @start: called when tracing is unpaused (echo 1 > tracing_enabled) * @stop: called when tracing is paused (echo 0 > tracing_enabled) * @open: called when the trace file is opened * @pipe_open: called when the trace_pipe file is opened * @wait_pipe: override how the user waits for traces on trace_pipe * @close: called when the trace file is released * @read: override the default read callback on trace_pipe * @splice_read: override the default splice_read callback on trace_pipe * @selftest: selftest to run on boot (see trace_selftest.c) * @print_headers: override the first lines that describe your columns * @print_line: callback that prints a trace * @set_flag: signals one of your private flags changed (trace_options file) * @flags: your private flags */struct tracer {	const char		*name;	int			(*init)(struct trace_array *tr);	void			(*reset)(struct trace_array *tr);	void			(*start)(struct trace_array *tr);	void			(*stop)(struct trace_array *tr);	void			(*open)(struct trace_iterator *iter);	void			(*pipe_open)(struct trace_iterator *iter);	void			(*wait_pipe)(struct trace_iterator *iter);	void			(*close)(struct trace_iterator *iter);	ssize_t			(*read)(struct trace_iterator *iter,					struct file *filp, char __user *ubuf,					size_t cnt, loff_t *ppos);	ssize_t			(*splice_read)(struct trace_iterator *iter,					       struct file *filp,					       loff_t *ppos,					       struct pipe_inode_info *pipe,					       size_t len,					       unsigned int flags);#ifdef CONFIG_FTRACE_STARTUP_TEST	int			(*selftest)(struct tracer *trace,					    struct trace_array *tr);#endif	void			(*print_header)(struct seq_file *m);	enum print_line_t	(*print_line)(struct trace_iterator *iter);	/* If you handled the flag setting, return 0 */	int			(*set_flag)(u32 old_flags, u32 bit, int set);	struct tracer		*next;	int			print_max;	struct tracer_flags	*flags;	struct tracer_stat	*stats;}; struct trace_seq {	unsigned char		buffer[PAGE_SIZE];	unsigned int		len;	unsigned int		readpos;}; static inline voidtrace_seq_init(struct trace_seq *s){	s->len = 0;	s->readpos = 0;}  #define TRACE_PIPE_ALL_CPU	-1 /* * Trace iterator - used by printout routines who present trace * results to users and which routines might sleep, etc: */struct trace_iterator {	struct trace_array	*tr;	struct tracer		*trace;	void			*private;	int			cpu_file;	struct mutex		mutex;	struct ring_buffer_iter	*buffer_iter[NR_CPUS]; 	/* The below is zeroed out in pipe_read */	struct trace_seq	seq;	struct trace_entry	*ent;	int			cpu;	u64			ts; 	unsigned long		iter_flags;	loff_t			pos;	long			idx; 	cpumask_var_t		started;}; int tracer_init(struct tracer *t, struct trace_array *tr);int tracing_is_enabled(void);void trace_wake_up(void);void tracing_reset(struct trace_array *tr, int cpu);void tracing_reset_online_cpus(struct trace_array *tr);int tracing_open_generic(struct inode *inode, struct file *filp);struct dentry *tracing_init_dentry(void);void init_tracer_sysprof_debugfs(struct dentry *d_tracer); struct ring_buffer_event; struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,						    unsigned char type,						    unsigned long len,						    unsigned long flags,						    int pc);void trace_buffer_unlock_commit(struct trace_array *tr,				struct ring_buffer_event *event,				unsigned long flags, int pc); struct ring_buffer_event *trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,				  unsigned long flags, int pc);void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,					unsigned long flags, int pc);void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,					unsigned long flags, int pc); struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,						struct trace_array_cpu *data); struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,					  int *ent_cpu, u64 *ent_ts); 

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