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2012 lines
64 KiB
2012 lines
64 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#ifndef _LINUX_KERNEL_TRACE_H |
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#define _LINUX_KERNEL_TRACE_H |
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#include <linux/fs.h> |
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#include <linux/atomic.h> |
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#include <linux/sched.h> |
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#include <linux/clocksource.h> |
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#include <linux/ring_buffer.h> |
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#include <linux/mmiotrace.h> |
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#include <linux/tracepoint.h> |
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#include <linux/ftrace.h> |
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#include <linux/trace.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/trace_seq.h> |
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#include <linux/trace_events.h> |
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#include <linux/compiler.h> |
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#include <linux/glob.h> |
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#include <linux/irq_work.h> |
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#include <linux/workqueue.h> |
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#include <linux/ctype.h> |
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#include <linux/once_lite.h> |
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#include "pid_list.h" |
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#ifdef CONFIG_FTRACE_SYSCALLS |
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#include <asm/unistd.h> /* For NR_SYSCALLS */ |
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#include <asm/syscall.h> /* some archs define it here */ |
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#endif |
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#define TRACE_MODE_WRITE 0640 |
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#define TRACE_MODE_READ 0440 |
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enum trace_type { |
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__TRACE_FIRST_TYPE = 0, |
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TRACE_FN, |
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TRACE_CTX, |
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TRACE_WAKE, |
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TRACE_STACK, |
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TRACE_PRINT, |
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TRACE_BPRINT, |
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TRACE_MMIO_RW, |
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TRACE_MMIO_MAP, |
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TRACE_BRANCH, |
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TRACE_GRAPH_RET, |
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TRACE_GRAPH_ENT, |
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TRACE_USER_STACK, |
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TRACE_BLK, |
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TRACE_BPUTS, |
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TRACE_HWLAT, |
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TRACE_OSNOISE, |
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TRACE_TIMERLAT, |
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TRACE_RAW_DATA, |
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TRACE_FUNC_REPEATS, |
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__TRACE_LAST_TYPE, |
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}; |
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#undef __field |
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#define __field(type, item) type item; |
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#undef __field_fn |
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#define __field_fn(type, item) type item; |
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#undef __field_struct |
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#define __field_struct(type, item) __field(type, item) |
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#undef __field_desc |
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#define __field_desc(type, container, item) |
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#undef __field_packed |
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#define __field_packed(type, container, item) |
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#undef __array |
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#define __array(type, item, size) type item[size]; |
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#undef __array_desc |
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#define __array_desc(type, container, item, size) |
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#undef __dynamic_array |
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#define __dynamic_array(type, item) type item[]; |
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#undef __rel_dynamic_array |
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#define __rel_dynamic_array(type, item) type item[]; |
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#undef F_STRUCT |
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#define F_STRUCT(args...) args |
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#undef FTRACE_ENTRY |
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
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struct struct_name { \ |
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struct trace_entry ent; \ |
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tstruct \ |
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} |
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#undef FTRACE_ENTRY_DUP |
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#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) |
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#undef FTRACE_ENTRY_REG |
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#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ |
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
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#undef FTRACE_ENTRY_PACKED |
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#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ |
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed |
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#include "trace_entries.h" |
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/* Use this for memory failure errors */ |
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#define MEM_FAIL(condition, fmt, ...) \ |
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DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) |
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/* |
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* syscalls are special, and need special handling, this is why |
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* they are not included in trace_entries.h |
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*/ |
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struct syscall_trace_enter { |
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struct trace_entry ent; |
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int nr; |
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unsigned long args[]; |
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}; |
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struct syscall_trace_exit { |
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struct trace_entry ent; |
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int nr; |
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long ret; |
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}; |
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struct kprobe_trace_entry_head { |
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struct trace_entry ent; |
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unsigned long ip; |
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}; |
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struct eprobe_trace_entry_head { |
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struct trace_entry ent; |
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}; |
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struct kretprobe_trace_entry_head { |
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struct trace_entry ent; |
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unsigned long func; |
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unsigned long ret_ip; |
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}; |
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#define TRACE_BUF_SIZE 1024 |
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struct trace_array; |
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/* |
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* The CPU trace array - it consists of thousands of trace entries |
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* plus some other descriptor data: (for example which task started |
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* the trace, etc.) |
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*/ |
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struct trace_array_cpu { |
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atomic_t disabled; |
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void *buffer_page; /* ring buffer spare */ |
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unsigned long entries; |
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unsigned long saved_latency; |
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unsigned long critical_start; |
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unsigned long critical_end; |
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unsigned long critical_sequence; |
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unsigned long nice; |
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unsigned long policy; |
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unsigned long rt_priority; |
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unsigned long skipped_entries; |
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u64 preempt_timestamp; |
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pid_t pid; |
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kuid_t uid; |
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char comm[TASK_COMM_LEN]; |
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#ifdef CONFIG_FUNCTION_TRACER |
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int ftrace_ignore_pid; |
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#endif |
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bool ignore_pid; |
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}; |
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struct tracer; |
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struct trace_option_dentry; |
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struct array_buffer { |
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struct trace_array *tr; |
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struct trace_buffer *buffer; |
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struct trace_array_cpu __percpu *data; |
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u64 time_start; |
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int cpu; |
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}; |
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#define TRACE_FLAGS_MAX_SIZE 32 |
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struct trace_options { |
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struct tracer *tracer; |
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struct trace_option_dentry *topts; |
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}; |
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struct trace_pid_list *trace_pid_list_alloc(void); |
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void trace_pid_list_free(struct trace_pid_list *pid_list); |
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bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); |
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int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); |
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int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); |
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int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); |
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int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, |
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unsigned int *next); |
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enum { |
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TRACE_PIDS = BIT(0), |
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TRACE_NO_PIDS = BIT(1), |
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}; |
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static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, |
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struct trace_pid_list *no_pid_list) |
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{ |
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/* Return true if the pid list in type has pids */ |
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return ((type & TRACE_PIDS) && pid_list) || |
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((type & TRACE_NO_PIDS) && no_pid_list); |
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} |
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static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, |
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struct trace_pid_list *no_pid_list) |
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{ |
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/* |
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* Turning off what is in @type, return true if the "other" |
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* pid list, still has pids in it. |
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*/ |
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return (!(type & TRACE_PIDS) && pid_list) || |
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(!(type & TRACE_NO_PIDS) && no_pid_list); |
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} |
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typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); |
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/** |
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* struct cond_snapshot - conditional snapshot data and callback |
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* |
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* The cond_snapshot structure encapsulates a callback function and |
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* data associated with the snapshot for a given tracing instance. |
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* |
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* When a snapshot is taken conditionally, by invoking |
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* tracing_snapshot_cond(tr, cond_data), the cond_data passed in is |
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* passed in turn to the cond_snapshot.update() function. That data |
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* can be compared by the update() implementation with the cond_data |
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* contained within the struct cond_snapshot instance associated with |
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* the trace_array. Because the tr->max_lock is held throughout the |
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* update() call, the update() function can directly retrieve the |
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* cond_snapshot and cond_data associated with the per-instance |
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* snapshot associated with the trace_array. |
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* |
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* The cond_snapshot.update() implementation can save data to be |
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* associated with the snapshot if it decides to, and returns 'true' |
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* in that case, or it returns 'false' if the conditional snapshot |
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* shouldn't be taken. |
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* |
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* The cond_snapshot instance is created and associated with the |
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* user-defined cond_data by tracing_cond_snapshot_enable(). |
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* Likewise, the cond_snapshot instance is destroyed and is no longer |
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* associated with the trace instance by |
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* tracing_cond_snapshot_disable(). |
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* |
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* The method below is required. |
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* |
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* @update: When a conditional snapshot is invoked, the update() |
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* callback function is invoked with the tr->max_lock held. The |
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* update() implementation signals whether or not to actually |
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* take the snapshot, by returning 'true' if so, 'false' if no |
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* snapshot should be taken. Because the max_lock is held for |
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* the duration of update(), the implementation is safe to |
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* directly retrieved and save any implementation data it needs |
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* to in association with the snapshot. |
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*/ |
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struct cond_snapshot { |
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void *cond_data; |
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cond_update_fn_t update; |
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}; |
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/* |
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* struct trace_func_repeats - used to keep track of the consecutive |
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* (on the same CPU) calls of a single function. |
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*/ |
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struct trace_func_repeats { |
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unsigned long ip; |
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unsigned long parent_ip; |
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unsigned long count; |
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u64 ts_last_call; |
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}; |
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/* |
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* The trace array - an array of per-CPU trace arrays. This is the |
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* highest level data structure that individual tracers deal with. |
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* They have on/off state as well: |
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*/ |
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struct trace_array { |
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struct list_head list; |
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char *name; |
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struct array_buffer array_buffer; |
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#ifdef CONFIG_TRACER_MAX_TRACE |
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/* |
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* The max_buffer is used to snapshot the trace when a maximum |
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* latency is reached, or when the user initiates a snapshot. |
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* Some tracers will use this to store a maximum trace while |
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* it continues examining live traces. |
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* |
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* The buffers for the max_buffer are set up the same as the array_buffer |
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* When a snapshot is taken, the buffer of the max_buffer is swapped |
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* with the buffer of the array_buffer and the buffers are reset for |
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* the array_buffer so the tracing can continue. |
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*/ |
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struct array_buffer max_buffer; |
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bool allocated_snapshot; |
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#endif |
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#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ |
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|| defined(CONFIG_OSNOISE_TRACER) |
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unsigned long max_latency; |
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#ifdef CONFIG_FSNOTIFY |
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struct dentry *d_max_latency; |
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struct work_struct fsnotify_work; |
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struct irq_work fsnotify_irqwork; |
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#endif |
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#endif |
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struct trace_pid_list __rcu *filtered_pids; |
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struct trace_pid_list __rcu *filtered_no_pids; |
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/* |
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* max_lock is used to protect the swapping of buffers |
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* when taking a max snapshot. The buffers themselves are |
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* protected by per_cpu spinlocks. But the action of the swap |
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* needs its own lock. |
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* |
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* This is defined as a arch_spinlock_t in order to help |
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* with performance when lockdep debugging is enabled. |
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* |
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* It is also used in other places outside the update_max_tr |
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* so it needs to be defined outside of the |
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* CONFIG_TRACER_MAX_TRACE. |
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*/ |
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arch_spinlock_t max_lock; |
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int buffer_disabled; |
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#ifdef CONFIG_FTRACE_SYSCALLS |
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int sys_refcount_enter; |
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int sys_refcount_exit; |
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struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
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struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; |
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#endif |
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int stop_count; |
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int clock_id; |
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int nr_topts; |
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bool clear_trace; |
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int buffer_percent; |
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unsigned int n_err_log_entries; |
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struct tracer *current_trace; |
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unsigned int trace_flags; |
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unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
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unsigned int flags; |
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raw_spinlock_t start_lock; |
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struct list_head err_log; |
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struct dentry *dir; |
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struct dentry *options; |
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struct dentry *percpu_dir; |
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struct dentry *event_dir; |
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struct trace_options *topts; |
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struct list_head systems; |
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struct list_head events; |
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struct trace_event_file *trace_marker_file; |
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cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
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int ref; |
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int trace_ref; |
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#ifdef CONFIG_FUNCTION_TRACER |
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struct ftrace_ops *ops; |
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struct trace_pid_list __rcu *function_pids; |
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struct trace_pid_list __rcu *function_no_pids; |
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#ifdef CONFIG_DYNAMIC_FTRACE |
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/* All of these are protected by the ftrace_lock */ |
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struct list_head func_probes; |
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struct list_head mod_trace; |
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struct list_head mod_notrace; |
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#endif |
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/* function tracing enabled */ |
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int function_enabled; |
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#endif |
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int no_filter_buffering_ref; |
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struct list_head hist_vars; |
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#ifdef CONFIG_TRACER_SNAPSHOT |
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struct cond_snapshot *cond_snapshot; |
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#endif |
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struct trace_func_repeats __percpu *last_func_repeats; |
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}; |
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enum { |
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TRACE_ARRAY_FL_GLOBAL = (1 << 0) |
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}; |
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extern struct list_head ftrace_trace_arrays; |
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extern struct mutex trace_types_lock; |
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extern int trace_array_get(struct trace_array *tr); |
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extern int tracing_check_open_get_tr(struct trace_array *tr); |
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extern struct trace_array *trace_array_find(const char *instance); |
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extern struct trace_array *trace_array_find_get(const char *instance); |
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extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); |
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extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); |
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extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); |
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extern bool trace_clock_in_ns(struct trace_array *tr); |
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/* |
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* The global tracer (top) should be the first trace array added, |
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* but we check the flag anyway. |
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*/ |
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static inline struct trace_array *top_trace_array(void) |
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{ |
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struct trace_array *tr; |
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if (list_empty(&ftrace_trace_arrays)) |
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return NULL; |
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tr = list_entry(ftrace_trace_arrays.prev, |
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typeof(*tr), list); |
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WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); |
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return tr; |
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} |
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#define FTRACE_CMP_TYPE(var, type) \ |
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__builtin_types_compatible_p(typeof(var), type *) |
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#undef IF_ASSIGN |
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#define IF_ASSIGN(var, entry, etype, id) \ |
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if (FTRACE_CMP_TYPE(var, etype)) { \ |
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var = (typeof(var))(entry); \ |
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WARN_ON(id != 0 && (entry)->type != id); \ |
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break; \ |
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} |
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/* Will cause compile errors if type is not found. */ |
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extern void __ftrace_bad_type(void); |
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/* |
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* The trace_assign_type is a verifier that the entry type is |
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* the same as the type being assigned. To add new types simply |
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* add a line with the following format: |
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* |
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* IF_ASSIGN(var, ent, type, id); |
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* |
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* Where "type" is the trace type that includes the trace_entry |
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* as the "ent" item. And "id" is the trace identifier that is |
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* used in the trace_type enum. |
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* |
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* If the type can have more than one id, then use zero. |
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*/ |
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#define trace_assign_type(var, ent) \ |
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do { \ |
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IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ |
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IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ |
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IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
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IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
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IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
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IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
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IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
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IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ |
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IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ |
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IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ |
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IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ |
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IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
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TRACE_MMIO_RW); \ |
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IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ |
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TRACE_MMIO_MAP); \ |
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IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
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IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
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TRACE_GRAPH_ENT); \ |
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IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ |
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TRACE_GRAPH_RET); \ |
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IF_ASSIGN(var, ent, struct func_repeats_entry, \ |
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TRACE_FUNC_REPEATS); \ |
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__ftrace_bad_type(); \ |
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} while (0) |
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/* |
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* An option specific to a tracer. This is a boolean value. |
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* The bit is the bit index that sets its value on the |
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* flags value in struct tracer_flags. |
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*/ |
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struct tracer_opt { |
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const char *name; /* Will appear on the trace_options file */ |
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u32 bit; /* Mask assigned in val field in tracer_flags */ |
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}; |
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/* |
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* The set of specific options for a tracer. Your tracer |
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* have to set the initial value of the flags val. |
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*/ |
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struct tracer_flags { |
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u32 val; |
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struct tracer_opt *opts; |
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struct tracer *trace; |
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}; |
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/* Makes more easy to define a tracer opt */ |
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#define TRACER_OPT(s, b) .name = #s, .bit = b |
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struct trace_option_dentry { |
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struct tracer_opt *opt; |
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struct tracer_flags *flags; |
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struct trace_array *tr; |
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struct dentry *entry; |
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}; |
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/** |
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* struct tracer - a specific tracer and its callbacks to interact with tracefs |
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* @name: the name chosen to select it on the available_tracers file |
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* @init: called when one switches to this tracer (echo name > current_tracer) |
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* @reset: called when one switches to another tracer |
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* @start: called when tracing is unpaused (echo 1 > tracing_on) |
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* @stop: called when tracing is paused (echo 0 > tracing_on) |
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* @update_thresh: called when tracing_thresh is updated |
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* @open: called when the trace file is opened |
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* @pipe_open: called when the trace_pipe file is opened |
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* @close: called when the trace file is released |
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* @pipe_close: called when the trace_pipe file is released |
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* @read: override the default read callback on trace_pipe |
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* @splice_read: override the default splice_read callback on trace_pipe |
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* @selftest: selftest to run on boot (see trace_selftest.c) |
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* @print_headers: override the first lines that describe your columns |
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* @print_line: callback that prints a trace |
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* @set_flag: signals one of your private flags changed (trace_options file) |
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* @flags: your private flags |
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*/ |
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struct tracer { |
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const char *name; |
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int (*init)(struct trace_array *tr); |
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void (*reset)(struct trace_array *tr); |
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void (*start)(struct trace_array *tr); |
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void (*stop)(struct trace_array *tr); |
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int (*update_thresh)(struct trace_array *tr); |
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void (*open)(struct trace_iterator *iter); |
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void (*pipe_open)(struct trace_iterator *iter); |
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void (*close)(struct trace_iterator *iter); |
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void (*pipe_close)(struct trace_iterator *iter); |
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ssize_t (*read)(struct trace_iterator *iter, |
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struct file *filp, char __user *ubuf, |
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size_t cnt, loff_t *ppos); |
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ssize_t (*splice_read)(struct trace_iterator *iter, |
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struct file *filp, |
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loff_t *ppos, |
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struct pipe_inode_info *pipe, |
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size_t len, |
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unsigned int flags); |
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#ifdef CONFIG_FTRACE_STARTUP_TEST |
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int (*selftest)(struct tracer *trace, |
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struct trace_array *tr); |
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#endif |
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void (*print_header)(struct seq_file *m); |
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enum print_line_t (*print_line)(struct trace_iterator *iter); |
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/* If you handled the flag setting, return 0 */ |
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int (*set_flag)(struct trace_array *tr, |
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u32 old_flags, u32 bit, int set); |
|
/* Return 0 if OK with change, else return non-zero */ |
|
int (*flag_changed)(struct trace_array *tr, |
|
u32 mask, int set); |
|
struct tracer *next; |
|
struct tracer_flags *flags; |
|
int enabled; |
|
bool print_max; |
|
bool allow_instances; |
|
#ifdef CONFIG_TRACER_MAX_TRACE |
|
bool use_max_tr; |
|
#endif |
|
/* True if tracer cannot be enabled in kernel param */ |
|
bool noboot; |
|
}; |
|
|
|
static inline struct ring_buffer_iter * |
|
trace_buffer_iter(struct trace_iterator *iter, int cpu) |
|
{ |
|
return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; |
|
} |
|
|
|
int tracer_init(struct tracer *t, struct trace_array *tr); |
|
int tracing_is_enabled(void); |
|
void tracing_reset_online_cpus(struct array_buffer *buf); |
|
void tracing_reset_current(int cpu); |
|
void tracing_reset_all_online_cpus(void); |
|
int tracing_open_generic(struct inode *inode, struct file *filp); |
|
int tracing_open_generic_tr(struct inode *inode, struct file *filp); |
|
bool tracing_is_disabled(void); |
|
bool tracer_tracing_is_on(struct trace_array *tr); |
|
void tracer_tracing_on(struct trace_array *tr); |
|
void tracer_tracing_off(struct trace_array *tr); |
|
struct dentry *trace_create_file(const char *name, |
|
umode_t mode, |
|
struct dentry *parent, |
|
void *data, |
|
const struct file_operations *fops); |
|
|
|
int tracing_init_dentry(void); |
|
|
|
struct ring_buffer_event; |
|
|
|
struct ring_buffer_event * |
|
trace_buffer_lock_reserve(struct trace_buffer *buffer, |
|
int type, |
|
unsigned long len, |
|
unsigned int trace_ctx); |
|
|
|
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); |
|
|
|
void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, |
|
struct ring_buffer_event *event); |
|
|
|
bool trace_is_tracepoint_string(const char *str); |
|
const char *trace_event_format(struct trace_iterator *iter, const char *fmt); |
|
void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, |
|
va_list ap); |
|
|
|
int trace_empty(struct trace_iterator *iter); |
|
|
|
void *trace_find_next_entry_inc(struct trace_iterator *iter); |
|
|
|
void trace_init_global_iter(struct trace_iterator *iter); |
|
|
|
void tracing_iter_reset(struct trace_iterator *iter, int cpu); |
|
|
|
unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); |
|
unsigned long trace_total_entries(struct trace_array *tr); |
|
|
|
void trace_function(struct trace_array *tr, |
|
unsigned long ip, |
|
unsigned long parent_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_latency_header(struct seq_file *m); |
|
void trace_default_header(struct seq_file *m); |
|
void print_trace_header(struct seq_file *m, struct trace_iterator *iter); |
|
|
|
void trace_graph_return(struct ftrace_graph_ret *trace); |
|
int trace_graph_entry(struct ftrace_graph_ent *trace); |
|
void set_graph_array(struct trace_array *tr); |
|
|
|
void tracing_start_cmdline_record(void); |
|
void tracing_stop_cmdline_record(void); |
|
void tracing_start_tgid_record(void); |
|
void tracing_stop_tgid_record(void); |
|
|
|
int register_tracer(struct tracer *type); |
|
int is_tracing_stopped(void); |
|
|
|
loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
|
|
|
extern cpumask_var_t __read_mostly tracing_buffer_mask; |
|
|
|
#define for_each_tracing_cpu(cpu) \ |
|
for_each_cpu(cpu, tracing_buffer_mask) |
|
|
|
extern unsigned long nsecs_to_usecs(unsigned long nsecs); |
|
|
|
extern unsigned long tracing_thresh; |
|
|
|
/* PID filtering */ |
|
|
|
extern int pid_max; |
|
|
|
bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, |
|
pid_t search_pid); |
|
bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, |
|
struct trace_pid_list *filtered_no_pids, |
|
struct task_struct *task); |
|
void trace_filter_add_remove_task(struct trace_pid_list *pid_list, |
|
struct task_struct *self, |
|
struct task_struct *task); |
|
void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); |
|
void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); |
|
int trace_pid_show(struct seq_file *m, void *v); |
|
void trace_free_pid_list(struct trace_pid_list *pid_list); |
|
int trace_pid_write(struct trace_pid_list *filtered_pids, |
|
struct trace_pid_list **new_pid_list, |
|
const char __user *ubuf, size_t cnt); |
|
|
|
#ifdef CONFIG_TRACER_MAX_TRACE |
|
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, |
|
void *cond_data); |
|
void update_max_tr_single(struct trace_array *tr, |
|
struct task_struct *tsk, int cpu); |
|
#endif /* CONFIG_TRACER_MAX_TRACE */ |
|
|
|
#if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ |
|
|| defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY) |
|
#define LATENCY_FS_NOTIFY |
|
#endif |
|
|
|
#ifdef LATENCY_FS_NOTIFY |
|
void latency_fsnotify(struct trace_array *tr); |
|
#else |
|
static inline void latency_fsnotify(struct trace_array *tr) { } |
|
#endif |
|
|
|
#ifdef CONFIG_STACKTRACE |
|
void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); |
|
#else |
|
static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, |
|
int skip) |
|
{ |
|
} |
|
#endif /* CONFIG_STACKTRACE */ |
|
|
|
void trace_last_func_repeats(struct trace_array *tr, |
|
struct trace_func_repeats *last_info, |
|
unsigned int trace_ctx); |
|
|
|
extern u64 ftrace_now(int cpu); |
|
|
|
extern void trace_find_cmdline(int pid, char comm[]); |
|
extern int trace_find_tgid(int pid); |
|
extern void trace_event_follow_fork(struct trace_array *tr, bool enable); |
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE |
|
extern unsigned long ftrace_update_tot_cnt; |
|
extern unsigned long ftrace_number_of_pages; |
|
extern unsigned long ftrace_number_of_groups; |
|
void ftrace_init_trace_array(struct trace_array *tr); |
|
#else |
|
static inline void ftrace_init_trace_array(struct trace_array *tr) { } |
|
#endif |
|
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
|
extern int DYN_FTRACE_TEST_NAME(void); |
|
#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
|
extern int DYN_FTRACE_TEST_NAME2(void); |
|
|
|
extern bool ring_buffer_expanded; |
|
extern bool tracing_selftest_disabled; |
|
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST |
|
extern void __init disable_tracing_selftest(const char *reason); |
|
|
|
extern int trace_selftest_startup_function(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_function_graph(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_wakeup(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_nop(struct tracer *trace, |
|
struct trace_array *tr); |
|
extern int trace_selftest_startup_branch(struct tracer *trace, |
|
struct trace_array *tr); |
|
/* |
|
* Tracer data references selftest functions that only occur |
|
* on boot up. These can be __init functions. Thus, when selftests |
|
* are enabled, then the tracers need to reference __init functions. |
|
*/ |
|
#define __tracer_data __refdata |
|
#else |
|
static inline void __init disable_tracing_selftest(const char *reason) |
|
{ |
|
} |
|
/* Tracers are seldom changed. Optimize when selftests are disabled. */ |
|
#define __tracer_data __read_mostly |
|
#endif /* CONFIG_FTRACE_STARTUP_TEST */ |
|
|
|
extern void *head_page(struct trace_array_cpu *data); |
|
extern unsigned long long ns2usecs(u64 nsec); |
|
extern int |
|
trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
|
extern int |
|
trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
|
extern int |
|
trace_array_vprintk(struct trace_array *tr, |
|
unsigned long ip, const char *fmt, va_list args); |
|
int trace_array_printk_buf(struct trace_buffer *buffer, |
|
unsigned long ip, const char *fmt, ...); |
|
void trace_printk_seq(struct trace_seq *s); |
|
enum print_line_t print_trace_line(struct trace_iterator *iter); |
|
|
|
extern char trace_find_mark(unsigned long long duration); |
|
|
|
struct ftrace_hash; |
|
|
|
struct ftrace_mod_load { |
|
struct list_head list; |
|
char *func; |
|
char *module; |
|
int enable; |
|
}; |
|
|
|
enum { |
|
FTRACE_HASH_FL_MOD = (1 << 0), |
|
}; |
|
|
|
struct ftrace_hash { |
|
unsigned long size_bits; |
|
struct hlist_head *buckets; |
|
unsigned long count; |
|
unsigned long flags; |
|
struct rcu_head rcu; |
|
}; |
|
|
|
struct ftrace_func_entry * |
|
ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); |
|
|
|
static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) |
|
{ |
|
return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); |
|
} |
|
|
|
/* Standard output formatting function used for function return traces */ |
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
|
|
|
/* Flag options */ |
|
#define TRACE_GRAPH_PRINT_OVERRUN 0x1 |
|
#define TRACE_GRAPH_PRINT_CPU 0x2 |
|
#define TRACE_GRAPH_PRINT_OVERHEAD 0x4 |
|
#define TRACE_GRAPH_PRINT_PROC 0x8 |
|
#define TRACE_GRAPH_PRINT_DURATION 0x10 |
|
#define TRACE_GRAPH_PRINT_ABS_TIME 0x20 |
|
#define TRACE_GRAPH_PRINT_REL_TIME 0x40 |
|
#define TRACE_GRAPH_PRINT_IRQS 0x80 |
|
#define TRACE_GRAPH_PRINT_TAIL 0x100 |
|
#define TRACE_GRAPH_SLEEP_TIME 0x200 |
|
#define TRACE_GRAPH_GRAPH_TIME 0x400 |
|
#define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
|
#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) |
|
|
|
extern void ftrace_graph_sleep_time_control(bool enable); |
|
|
|
#ifdef CONFIG_FUNCTION_PROFILER |
|
extern void ftrace_graph_graph_time_control(bool enable); |
|
#else |
|
static inline void ftrace_graph_graph_time_control(bool enable) { } |
|
#endif |
|
|
|
extern enum print_line_t |
|
print_graph_function_flags(struct trace_iterator *iter, u32 flags); |
|
extern void print_graph_headers_flags(struct seq_file *s, u32 flags); |
|
extern void |
|
trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
|
extern void graph_trace_open(struct trace_iterator *iter); |
|
extern void graph_trace_close(struct trace_iterator *iter); |
|
extern int __trace_graph_entry(struct trace_array *tr, |
|
struct ftrace_graph_ent *trace, |
|
unsigned int trace_ctx); |
|
extern void __trace_graph_return(struct trace_array *tr, |
|
struct ftrace_graph_ret *trace, |
|
unsigned int trace_ctx); |
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE |
|
extern struct ftrace_hash __rcu *ftrace_graph_hash; |
|
extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; |
|
|
|
static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) |
|
{ |
|
unsigned long addr = trace->func; |
|
int ret = 0; |
|
struct ftrace_hash *hash; |
|
|
|
preempt_disable_notrace(); |
|
|
|
/* |
|
* Have to open code "rcu_dereference_sched()" because the |
|
* function graph tracer can be called when RCU is not |
|
* "watching". |
|
* Protected with schedule_on_each_cpu(ftrace_sync) |
|
*/ |
|
hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); |
|
|
|
if (ftrace_hash_empty(hash)) { |
|
ret = 1; |
|
goto out; |
|
} |
|
|
|
if (ftrace_lookup_ip(hash, addr)) { |
|
|
|
/* |
|
* This needs to be cleared on the return functions |
|
* when the depth is zero. |
|
*/ |
|
trace_recursion_set(TRACE_GRAPH_BIT); |
|
trace_recursion_set_depth(trace->depth); |
|
|
|
/* |
|
* If no irqs are to be traced, but a set_graph_function |
|
* is set, and called by an interrupt handler, we still |
|
* want to trace it. |
|
*/ |
|
if (in_hardirq()) |
|
trace_recursion_set(TRACE_IRQ_BIT); |
|
else |
|
trace_recursion_clear(TRACE_IRQ_BIT); |
|
ret = 1; |
|
} |
|
|
|
out: |
|
preempt_enable_notrace(); |
|
return ret; |
|
} |
|
|
|
static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) |
|
{ |
|
if (trace_recursion_test(TRACE_GRAPH_BIT) && |
|
trace->depth == trace_recursion_depth()) |
|
trace_recursion_clear(TRACE_GRAPH_BIT); |
|
} |
|
|
|
static inline int ftrace_graph_notrace_addr(unsigned long addr) |
|
{ |
|
int ret = 0; |
|
struct ftrace_hash *notrace_hash; |
|
|
|
preempt_disable_notrace(); |
|
|
|
/* |
|
* Have to open code "rcu_dereference_sched()" because the |
|
* function graph tracer can be called when RCU is not |
|
* "watching". |
|
* Protected with schedule_on_each_cpu(ftrace_sync) |
|
*/ |
|
notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, |
|
!preemptible()); |
|
|
|
if (ftrace_lookup_ip(notrace_hash, addr)) |
|
ret = 1; |
|
|
|
preempt_enable_notrace(); |
|
return ret; |
|
} |
|
#else |
|
static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) |
|
{ |
|
return 1; |
|
} |
|
|
|
static inline int ftrace_graph_notrace_addr(unsigned long addr) |
|
{ |
|
return 0; |
|
} |
|
static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) |
|
{ } |
|
#endif /* CONFIG_DYNAMIC_FTRACE */ |
|
|
|
extern unsigned int fgraph_max_depth; |
|
|
|
static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) |
|
{ |
|
/* trace it when it is-nested-in or is a function enabled. */ |
|
return !(trace_recursion_test(TRACE_GRAPH_BIT) || |
|
ftrace_graph_addr(trace)) || |
|
(trace->depth < 0) || |
|
(fgraph_max_depth && trace->depth >= fgraph_max_depth); |
|
} |
|
|
|
#else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
|
static inline enum print_line_t |
|
print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
|
{ |
|
return TRACE_TYPE_UNHANDLED; |
|
} |
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
|
|
|
extern struct list_head ftrace_pids; |
|
|
|
#ifdef CONFIG_FUNCTION_TRACER |
|
|
|
#define FTRACE_PID_IGNORE -1 |
|
#define FTRACE_PID_TRACE -2 |
|
|
|
struct ftrace_func_command { |
|
struct list_head list; |
|
char *name; |
|
int (*func)(struct trace_array *tr, |
|
struct ftrace_hash *hash, |
|
char *func, char *cmd, |
|
char *params, int enable); |
|
}; |
|
extern bool ftrace_filter_param __initdata; |
|
static inline int ftrace_trace_task(struct trace_array *tr) |
|
{ |
|
return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != |
|
FTRACE_PID_IGNORE; |
|
} |
|
extern int ftrace_is_dead(void); |
|
int ftrace_create_function_files(struct trace_array *tr, |
|
struct dentry *parent); |
|
void ftrace_destroy_function_files(struct trace_array *tr); |
|
int ftrace_allocate_ftrace_ops(struct trace_array *tr); |
|
void ftrace_free_ftrace_ops(struct trace_array *tr); |
|
void ftrace_init_global_array_ops(struct trace_array *tr); |
|
void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); |
|
void ftrace_reset_array_ops(struct trace_array *tr); |
|
void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
|
void ftrace_init_tracefs_toplevel(struct trace_array *tr, |
|
struct dentry *d_tracer); |
|
void ftrace_clear_pids(struct trace_array *tr); |
|
int init_function_trace(void); |
|
void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); |
|
#else |
|
static inline int ftrace_trace_task(struct trace_array *tr) |
|
{ |
|
return 1; |
|
} |
|
static inline int ftrace_is_dead(void) { return 0; } |
|
static inline int |
|
ftrace_create_function_files(struct trace_array *tr, |
|
struct dentry *parent) |
|
{ |
|
return 0; |
|
} |
|
static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) |
|
{ |
|
return 0; |
|
} |
|
static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } |
|
static inline void ftrace_destroy_function_files(struct trace_array *tr) { } |
|
static inline __init void |
|
ftrace_init_global_array_ops(struct trace_array *tr) { } |
|
static inline void ftrace_reset_array_ops(struct trace_array *tr) { } |
|
static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } |
|
static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } |
|
static inline void ftrace_clear_pids(struct trace_array *tr) { } |
|
static inline int init_function_trace(void) { return 0; } |
|
static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } |
|
/* ftace_func_t type is not defined, use macro instead of static inline */ |
|
#define ftrace_init_array_ops(tr, func) do { } while (0) |
|
#endif /* CONFIG_FUNCTION_TRACER */ |
|
|
|
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) |
|
|
|
struct ftrace_probe_ops { |
|
void (*func)(unsigned long ip, |
|
unsigned long parent_ip, |
|
struct trace_array *tr, |
|
struct ftrace_probe_ops *ops, |
|
void *data); |
|
int (*init)(struct ftrace_probe_ops *ops, |
|
struct trace_array *tr, |
|
unsigned long ip, void *init_data, |
|
void **data); |
|
void (*free)(struct ftrace_probe_ops *ops, |
|
struct trace_array *tr, |
|
unsigned long ip, void *data); |
|
int (*print)(struct seq_file *m, |
|
unsigned long ip, |
|
struct ftrace_probe_ops *ops, |
|
void *data); |
|
}; |
|
|
|
struct ftrace_func_mapper; |
|
typedef int (*ftrace_mapper_func)(void *data); |
|
|
|
struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); |
|
void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, |
|
unsigned long ip); |
|
int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, |
|
unsigned long ip, void *data); |
|
void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, |
|
unsigned long ip); |
|
void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, |
|
ftrace_mapper_func free_func); |
|
|
|
extern int |
|
register_ftrace_function_probe(char *glob, struct trace_array *tr, |
|
struct ftrace_probe_ops *ops, void *data); |
|
extern int |
|
unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, |
|
struct ftrace_probe_ops *ops); |
|
extern void clear_ftrace_function_probes(struct trace_array *tr); |
|
|
|
int register_ftrace_command(struct ftrace_func_command *cmd); |
|
int unregister_ftrace_command(struct ftrace_func_command *cmd); |
|
|
|
void ftrace_create_filter_files(struct ftrace_ops *ops, |
|
struct dentry *parent); |
|
void ftrace_destroy_filter_files(struct ftrace_ops *ops); |
|
|
|
extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
|
int len, int reset); |
|
extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
|
int len, int reset); |
|
#else |
|
struct ftrace_func_command; |
|
|
|
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 void clear_ftrace_function_probes(struct trace_array *tr) |
|
{ |
|
} |
|
|
|
/* |
|
* The ops parameter passed in is usually undefined. |
|
* This must be a macro. |
|
*/ |
|
#define ftrace_create_filter_files(ops, parent) do { } while (0) |
|
#define ftrace_destroy_filter_files(ops) do { } while (0) |
|
#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ |
|
|
|
bool ftrace_event_is_function(struct trace_event_call *call); |
|
|
|
/* |
|
* struct trace_parser - servers for reading the user input separated by spaces |
|
* @cont: set if the input is not complete - no final space char was found |
|
* @buffer: holds the parsed user input |
|
* @idx: user input length |
|
* @size: buffer size |
|
*/ |
|
struct trace_parser { |
|
bool cont; |
|
char *buffer; |
|
unsigned idx; |
|
unsigned size; |
|
}; |
|
|
|
static inline bool trace_parser_loaded(struct trace_parser *parser) |
|
{ |
|
return (parser->idx != 0); |
|
} |
|
|
|
static inline bool trace_parser_cont(struct trace_parser *parser) |
|
{ |
|
return parser->cont; |
|
} |
|
|
|
static inline void trace_parser_clear(struct trace_parser *parser) |
|
{ |
|
parser->cont = false; |
|
parser->idx = 0; |
|
} |
|
|
|
extern int trace_parser_get_init(struct trace_parser *parser, int size); |
|
extern void trace_parser_put(struct trace_parser *parser); |
|
extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, |
|
size_t cnt, loff_t *ppos); |
|
|
|
/* |
|
* Only create function graph options if function graph is configured. |
|
*/ |
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
|
# define FGRAPH_FLAGS \ |
|
C(DISPLAY_GRAPH, "display-graph"), |
|
#else |
|
# define FGRAPH_FLAGS |
|
#endif |
|
|
|
#ifdef CONFIG_BRANCH_TRACER |
|
# define BRANCH_FLAGS \ |
|
C(BRANCH, "branch"), |
|
#else |
|
# define BRANCH_FLAGS |
|
#endif |
|
|
|
#ifdef CONFIG_FUNCTION_TRACER |
|
# define FUNCTION_FLAGS \ |
|
C(FUNCTION, "function-trace"), \ |
|
C(FUNC_FORK, "function-fork"), |
|
# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION |
|
#else |
|
# define FUNCTION_FLAGS |
|
# define FUNCTION_DEFAULT_FLAGS 0UL |
|
# define TRACE_ITER_FUNC_FORK 0UL |
|
#endif |
|
|
|
#ifdef CONFIG_STACKTRACE |
|
# define STACK_FLAGS \ |
|
C(STACKTRACE, "stacktrace"), |
|
#else |
|
# define STACK_FLAGS |
|
#endif |
|
|
|
/* |
|
* trace_iterator_flags is an enumeration that defines bit |
|
* positions into trace_flags that controls the output. |
|
* |
|
* NOTE: These bits must match the trace_options array in |
|
* trace.c (this macro guarantees it). |
|
*/ |
|
#define TRACE_FLAGS \ |
|
C(PRINT_PARENT, "print-parent"), \ |
|
C(SYM_OFFSET, "sym-offset"), \ |
|
C(SYM_ADDR, "sym-addr"), \ |
|
C(VERBOSE, "verbose"), \ |
|
C(RAW, "raw"), \ |
|
C(HEX, "hex"), \ |
|
C(BIN, "bin"), \ |
|
C(BLOCK, "block"), \ |
|
C(PRINTK, "trace_printk"), \ |
|
C(ANNOTATE, "annotate"), \ |
|
C(USERSTACKTRACE, "userstacktrace"), \ |
|
C(SYM_USEROBJ, "sym-userobj"), \ |
|
C(PRINTK_MSGONLY, "printk-msg-only"), \ |
|
C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ |
|
C(LATENCY_FMT, "latency-format"), \ |
|
C(RECORD_CMD, "record-cmd"), \ |
|
C(RECORD_TGID, "record-tgid"), \ |
|
C(OVERWRITE, "overwrite"), \ |
|
C(STOP_ON_FREE, "disable_on_free"), \ |
|
C(IRQ_INFO, "irq-info"), \ |
|
C(MARKERS, "markers"), \ |
|
C(EVENT_FORK, "event-fork"), \ |
|
C(PAUSE_ON_TRACE, "pause-on-trace"), \ |
|
C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ |
|
FUNCTION_FLAGS \ |
|
FGRAPH_FLAGS \ |
|
STACK_FLAGS \ |
|
BRANCH_FLAGS |
|
|
|
/* |
|
* By defining C, we can make TRACE_FLAGS a list of bit names |
|
* that will define the bits for the flag masks. |
|
*/ |
|
#undef C |
|
#define C(a, b) TRACE_ITER_##a##_BIT |
|
|
|
enum trace_iterator_bits { |
|
TRACE_FLAGS |
|
/* Make sure we don't go more than we have bits for */ |
|
TRACE_ITER_LAST_BIT |
|
}; |
|
|
|
/* |
|
* By redefining C, we can make TRACE_FLAGS a list of masks that |
|
* use the bits as defined above. |
|
*/ |
|
#undef C |
|
#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) |
|
|
|
enum trace_iterator_flags { TRACE_FLAGS }; |
|
|
|
/* |
|
* TRACE_ITER_SYM_MASK masks the options in trace_flags that |
|
* control the output of kernel symbols. |
|
*/ |
|
#define TRACE_ITER_SYM_MASK \ |
|
(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
|
|
|
extern struct tracer nop_trace; |
|
|
|
#ifdef CONFIG_BRANCH_TRACER |
|
extern int enable_branch_tracing(struct trace_array *tr); |
|
extern void disable_branch_tracing(void); |
|
static inline int trace_branch_enable(struct trace_array *tr) |
|
{ |
|
if (tr->trace_flags & TRACE_ITER_BRANCH) |
|
return enable_branch_tracing(tr); |
|
return 0; |
|
} |
|
static inline void trace_branch_disable(void) |
|
{ |
|
/* due to races, always disable */ |
|
disable_branch_tracing(); |
|
} |
|
#else |
|
static inline int trace_branch_enable(struct trace_array *tr) |
|
{ |
|
return 0; |
|
} |
|
static inline void trace_branch_disable(void) |
|
{ |
|
} |
|
#endif /* CONFIG_BRANCH_TRACER */ |
|
|
|
/* set ring buffers to default size if not already done so */ |
|
int tracing_update_buffers(void); |
|
|
|
struct ftrace_event_field { |
|
struct list_head link; |
|
const char *name; |
|
const char *type; |
|
int filter_type; |
|
int offset; |
|
int size; |
|
int is_signed; |
|
}; |
|
|
|
struct prog_entry; |
|
|
|
struct event_filter { |
|
struct prog_entry __rcu *prog; |
|
char *filter_string; |
|
}; |
|
|
|
struct event_subsystem { |
|
struct list_head list; |
|
const char *name; |
|
struct event_filter *filter; |
|
int ref_count; |
|
}; |
|
|
|
struct trace_subsystem_dir { |
|
struct list_head list; |
|
struct event_subsystem *subsystem; |
|
struct trace_array *tr; |
|
struct dentry *entry; |
|
int ref_count; |
|
int nr_events; |
|
}; |
|
|
|
extern int call_filter_check_discard(struct trace_event_call *call, void *rec, |
|
struct trace_buffer *buffer, |
|
struct ring_buffer_event *event); |
|
|
|
void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
|
struct trace_buffer *buffer, |
|
struct ring_buffer_event *event, |
|
unsigned int trcace_ctx, |
|
struct pt_regs *regs); |
|
|
|
static inline void trace_buffer_unlock_commit(struct trace_array *tr, |
|
struct trace_buffer *buffer, |
|
struct ring_buffer_event *event, |
|
unsigned int trace_ctx) |
|
{ |
|
trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); |
|
} |
|
|
|
DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); |
|
DECLARE_PER_CPU(int, trace_buffered_event_cnt); |
|
void trace_buffered_event_disable(void); |
|
void trace_buffered_event_enable(void); |
|
|
|
static inline void |
|
__trace_event_discard_commit(struct trace_buffer *buffer, |
|
struct ring_buffer_event *event) |
|
{ |
|
if (this_cpu_read(trace_buffered_event) == event) { |
|
/* Simply release the temp buffer and enable preemption */ |
|
this_cpu_dec(trace_buffered_event_cnt); |
|
preempt_enable_notrace(); |
|
return; |
|
} |
|
/* ring_buffer_discard_commit() enables preemption */ |
|
ring_buffer_discard_commit(buffer, event); |
|
} |
|
|
|
/* |
|
* Helper function for event_trigger_unlock_commit{_regs}(). |
|
* If there are event triggers attached to this event that requires |
|
* filtering against its fields, then they will be called as the |
|
* entry already holds the field information of the current event. |
|
* |
|
* It also checks if the event should be discarded or not. |
|
* It is to be discarded if the event is soft disabled and the |
|
* event was only recorded to process triggers, or if the event |
|
* filter is active and this event did not match the filters. |
|
* |
|
* Returns true if the event is discarded, false otherwise. |
|
*/ |
|
static inline bool |
|
__event_trigger_test_discard(struct trace_event_file *file, |
|
struct trace_buffer *buffer, |
|
struct ring_buffer_event *event, |
|
void *entry, |
|
enum event_trigger_type *tt) |
|
{ |
|
unsigned long eflags = file->flags; |
|
|
|
if (eflags & EVENT_FILE_FL_TRIGGER_COND) |
|
*tt = event_triggers_call(file, buffer, entry, event); |
|
|
|
if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | |
|
EVENT_FILE_FL_FILTERED | |
|
EVENT_FILE_FL_PID_FILTER)))) |
|
return false; |
|
|
|
if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) |
|
goto discard; |
|
|
|
if (file->flags & EVENT_FILE_FL_FILTERED && |
|
!filter_match_preds(file->filter, entry)) |
|
goto discard; |
|
|
|
if ((file->flags & EVENT_FILE_FL_PID_FILTER) && |
|
trace_event_ignore_this_pid(file)) |
|
goto discard; |
|
|
|
return false; |
|
discard: |
|
__trace_event_discard_commit(buffer, event); |
|
return true; |
|
} |
|
|
|
/** |
|
* event_trigger_unlock_commit - handle triggers and finish event commit |
|
* @file: The file pointer associated with the event |
|
* @buffer: The ring buffer that the event is being written to |
|
* @event: The event meta data in the ring buffer |
|
* @entry: The event itself |
|
* @trace_ctx: The tracing context flags. |
|
* |
|
* This is a helper function to handle triggers that require data |
|
* from the event itself. It also tests the event against filters and |
|
* if the event is soft disabled and should be discarded. |
|
*/ |
|
static inline void |
|
event_trigger_unlock_commit(struct trace_event_file *file, |
|
struct trace_buffer *buffer, |
|
struct ring_buffer_event *event, |
|
void *entry, unsigned int trace_ctx) |
|
{ |
|
enum event_trigger_type tt = ETT_NONE; |
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) |
|
trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); |
|
|
|
if (tt) |
|
event_triggers_post_call(file, tt); |
|
} |
|
|
|
#define FILTER_PRED_INVALID ((unsigned short)-1) |
|
#define FILTER_PRED_IS_RIGHT (1 << 15) |
|
#define FILTER_PRED_FOLD (1 << 15) |
|
|
|
/* |
|
* The max preds is the size of unsigned short with |
|
* two flags at the MSBs. One bit is used for both the IS_RIGHT |
|
* and FOLD flags. The other is reserved. |
|
* |
|
* 2^14 preds is way more than enough. |
|
*/ |
|
#define MAX_FILTER_PRED 16384 |
|
|
|
struct filter_pred; |
|
struct regex; |
|
|
|
typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
|
|
|
typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
|
|
|
enum regex_type { |
|
MATCH_FULL = 0, |
|
MATCH_FRONT_ONLY, |
|
MATCH_MIDDLE_ONLY, |
|
MATCH_END_ONLY, |
|
MATCH_GLOB, |
|
MATCH_INDEX, |
|
}; |
|
|
|
struct regex { |
|
char pattern[MAX_FILTER_STR_VAL]; |
|
int len; |
|
int field_len; |
|
regex_match_func match; |
|
}; |
|
|
|
struct filter_pred { |
|
filter_pred_fn_t fn; |
|
u64 val; |
|
struct regex regex; |
|
unsigned short *ops; |
|
struct ftrace_event_field *field; |
|
int offset; |
|
int not; |
|
int op; |
|
}; |
|
|
|
static inline bool is_string_field(struct ftrace_event_field *field) |
|
{ |
|
return field->filter_type == FILTER_DYN_STRING || |
|
field->filter_type == FILTER_RDYN_STRING || |
|
field->filter_type == FILTER_STATIC_STRING || |
|
field->filter_type == FILTER_PTR_STRING || |
|
field->filter_type == FILTER_COMM; |
|
} |
|
|
|
static inline bool is_function_field(struct ftrace_event_field *field) |
|
{ |
|
return field->filter_type == FILTER_TRACE_FN; |
|
} |
|
|
|
extern enum regex_type |
|
filter_parse_regex(char *buff, int len, char **search, int *not); |
|
extern void print_event_filter(struct trace_event_file *file, |
|
struct trace_seq *s); |
|
extern int apply_event_filter(struct trace_event_file *file, |
|
char *filter_string); |
|
extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
|
char *filter_string); |
|
extern void print_subsystem_event_filter(struct event_subsystem *system, |
|
struct trace_seq *s); |
|
extern int filter_assign_type(const char *type); |
|
extern int create_event_filter(struct trace_array *tr, |
|
struct trace_event_call *call, |
|
char *filter_str, bool set_str, |
|
struct event_filter **filterp); |
|
extern void free_event_filter(struct event_filter *filter); |
|
|
|
struct ftrace_event_field * |
|
trace_find_event_field(struct trace_event_call *call, char *name); |
|
|
|
extern void trace_event_enable_cmd_record(bool enable); |
|
extern void trace_event_enable_tgid_record(bool enable); |
|
|
|
extern int event_trace_init(void); |
|
extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
|
extern int event_trace_del_tracer(struct trace_array *tr); |
|
extern void __trace_early_add_events(struct trace_array *tr); |
|
|
|
extern struct trace_event_file *__find_event_file(struct trace_array *tr, |
|
const char *system, |
|
const char *event); |
|
extern struct trace_event_file *find_event_file(struct trace_array *tr, |
|
const char *system, |
|
const char *event); |
|
|
|
static inline void *event_file_data(struct file *filp) |
|
{ |
|
return READ_ONCE(file_inode(filp)->i_private); |
|
} |
|
|
|
extern struct mutex event_mutex; |
|
extern struct list_head ftrace_events; |
|
|
|
extern const struct file_operations event_trigger_fops; |
|
extern const struct file_operations event_hist_fops; |
|
extern const struct file_operations event_hist_debug_fops; |
|
extern const struct file_operations event_inject_fops; |
|
|
|
#ifdef CONFIG_HIST_TRIGGERS |
|
extern int register_trigger_hist_cmd(void); |
|
extern int register_trigger_hist_enable_disable_cmds(void); |
|
#else |
|
static inline int register_trigger_hist_cmd(void) { return 0; } |
|
static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } |
|
#endif |
|
|
|
extern int register_trigger_cmds(void); |
|
extern void clear_event_triggers(struct trace_array *tr); |
|
|
|
enum { |
|
EVENT_TRIGGER_FL_PROBE = BIT(0), |
|
}; |
|
|
|
struct event_trigger_data { |
|
unsigned long count; |
|
int ref; |
|
int flags; |
|
struct event_trigger_ops *ops; |
|
struct event_command *cmd_ops; |
|
struct event_filter __rcu *filter; |
|
char *filter_str; |
|
void *private_data; |
|
bool paused; |
|
bool paused_tmp; |
|
struct list_head list; |
|
char *name; |
|
struct list_head named_list; |
|
struct event_trigger_data *named_data; |
|
}; |
|
|
|
/* Avoid typos */ |
|
#define ENABLE_EVENT_STR "enable_event" |
|
#define DISABLE_EVENT_STR "disable_event" |
|
#define ENABLE_HIST_STR "enable_hist" |
|
#define DISABLE_HIST_STR "disable_hist" |
|
|
|
struct enable_trigger_data { |
|
struct trace_event_file *file; |
|
bool enable; |
|
bool hist; |
|
}; |
|
|
|
extern int event_enable_trigger_print(struct seq_file *m, |
|
struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
extern void event_enable_trigger_free(struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
extern int event_enable_trigger_parse(struct event_command *cmd_ops, |
|
struct trace_event_file *file, |
|
char *glob, char *cmd, char *param); |
|
extern int event_enable_register_trigger(char *glob, |
|
struct event_trigger_data *data, |
|
struct trace_event_file *file); |
|
extern void event_enable_unregister_trigger(char *glob, |
|
struct event_trigger_data *test, |
|
struct trace_event_file *file); |
|
extern void trigger_data_free(struct event_trigger_data *data); |
|
extern int event_trigger_init(struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
extern int trace_event_trigger_enable_disable(struct trace_event_file *file, |
|
int trigger_enable); |
|
extern void update_cond_flag(struct trace_event_file *file); |
|
extern int set_trigger_filter(char *filter_str, |
|
struct event_trigger_data *trigger_data, |
|
struct trace_event_file *file); |
|
extern struct event_trigger_data *find_named_trigger(const char *name); |
|
extern bool is_named_trigger(struct event_trigger_data *test); |
|
extern int save_named_trigger(const char *name, |
|
struct event_trigger_data *data); |
|
extern void del_named_trigger(struct event_trigger_data *data); |
|
extern void pause_named_trigger(struct event_trigger_data *data); |
|
extern void unpause_named_trigger(struct event_trigger_data *data); |
|
extern void set_named_trigger_data(struct event_trigger_data *data, |
|
struct event_trigger_data *named_data); |
|
extern struct event_trigger_data * |
|
get_named_trigger_data(struct event_trigger_data *data); |
|
extern int register_event_command(struct event_command *cmd); |
|
extern int unregister_event_command(struct event_command *cmd); |
|
extern int register_trigger_hist_enable_disable_cmds(void); |
|
extern bool event_trigger_check_remove(const char *glob); |
|
extern bool event_trigger_empty_param(const char *param); |
|
extern int event_trigger_separate_filter(char *param_and_filter, char **param, |
|
char **filter, bool param_required); |
|
extern struct event_trigger_data * |
|
event_trigger_alloc(struct event_command *cmd_ops, |
|
char *cmd, |
|
char *param, |
|
void *private_data); |
|
extern int event_trigger_parse_num(char *trigger, |
|
struct event_trigger_data *trigger_data); |
|
extern int event_trigger_set_filter(struct event_command *cmd_ops, |
|
struct trace_event_file *file, |
|
char *param, |
|
struct event_trigger_data *trigger_data); |
|
extern void event_trigger_reset_filter(struct event_command *cmd_ops, |
|
struct event_trigger_data *trigger_data); |
|
extern int event_trigger_register(struct event_command *cmd_ops, |
|
struct trace_event_file *file, |
|
char *glob, |
|
char *cmd, |
|
char *trigger, |
|
struct event_trigger_data *trigger_data, |
|
int *n_registered); |
|
|
|
/** |
|
* struct event_trigger_ops - callbacks for trace event triggers |
|
* |
|
* The methods in this structure provide per-event trigger hooks for |
|
* various trigger operations. |
|
* |
|
* The @init and @free methods are used during trigger setup and |
|
* teardown, typically called from an event_command's @parse() |
|
* function implementation. |
|
* |
|
* The @print method is used to print the trigger spec. |
|
* |
|
* The @trigger method is the function that actually implements the |
|
* trigger and is called in the context of the triggering event |
|
* whenever that event occurs. |
|
* |
|
* All the methods below, except for @init() and @free(), must be |
|
* implemented. |
|
* |
|
* @trigger: The trigger 'probe' function called when the triggering |
|
* event occurs. The data passed into this callback is the data |
|
* that was supplied to the event_command @reg() function that |
|
* registered the trigger (see struct event_command) along with |
|
* the trace record, rec. |
|
* |
|
* @init: An optional initialization function called for the trigger |
|
* when the trigger is registered (via the event_command reg() |
|
* function). This can be used to perform per-trigger |
|
* initialization such as incrementing a per-trigger reference |
|
* count, for instance. This is usually implemented by the |
|
* generic utility function @event_trigger_init() (see |
|
* trace_event_triggers.c). |
|
* |
|
* @free: An optional de-initialization function called for the |
|
* trigger when the trigger is unregistered (via the |
|
* event_command @reg() function). This can be used to perform |
|
* per-trigger de-initialization such as decrementing a |
|
* per-trigger reference count and freeing corresponding trigger |
|
* data, for instance. This is usually implemented by the |
|
* generic utility function @event_trigger_free() (see |
|
* trace_event_triggers.c). |
|
* |
|
* @print: The callback function invoked to have the trigger print |
|
* itself. This is usually implemented by a wrapper function |
|
* that calls the generic utility function @event_trigger_print() |
|
* (see trace_event_triggers.c). |
|
*/ |
|
struct event_trigger_ops { |
|
void (*trigger)(struct event_trigger_data *data, |
|
struct trace_buffer *buffer, |
|
void *rec, |
|
struct ring_buffer_event *rbe); |
|
int (*init)(struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
void (*free)(struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
int (*print)(struct seq_file *m, |
|
struct event_trigger_ops *ops, |
|
struct event_trigger_data *data); |
|
}; |
|
|
|
/** |
|
* struct event_command - callbacks and data members for event commands |
|
* |
|
* Event commands are invoked by users by writing the command name |
|
* into the 'trigger' file associated with a trace event. The |
|
* parameters associated with a specific invocation of an event |
|
* command are used to create an event trigger instance, which is |
|
* added to the list of trigger instances associated with that trace |
|
* event. When the event is hit, the set of triggers associated with |
|
* that event is invoked. |
|
* |
|
* The data members in this structure provide per-event command data |
|
* for various event commands. |
|
* |
|
* All the data members below, except for @post_trigger, must be set |
|
* for each event command. |
|
* |
|
* @name: The unique name that identifies the event command. This is |
|
* the name used when setting triggers via trigger files. |
|
* |
|
* @trigger_type: A unique id that identifies the event command |
|
* 'type'. This value has two purposes, the first to ensure that |
|
* only one trigger of the same type can be set at a given time |
|
* for a particular event e.g. it doesn't make sense to have both |
|
* a traceon and traceoff trigger attached to a single event at |
|
* the same time, so traceon and traceoff have the same type |
|
* though they have different names. The @trigger_type value is |
|
* also used as a bit value for deferring the actual trigger |
|
* action until after the current event is finished. Some |
|
* commands need to do this if they themselves log to the trace |
|
* buffer (see the @post_trigger() member below). @trigger_type |
|
* values are defined by adding new values to the trigger_type |
|
* enum in include/linux/trace_events.h. |
|
* |
|
* @flags: See the enum event_command_flags below. |
|
* |
|
* All the methods below, except for @set_filter() and @unreg_all(), |
|
* must be implemented. |
|
* |
|
* @parse: The callback function responsible for parsing and |
|
* registering the trigger written to the 'trigger' file by the |
|
* user. It allocates the trigger instance and registers it with |
|
* the appropriate trace event. It makes use of the other |
|
* event_command callback functions to orchestrate this, and is |
|
* usually implemented by the generic utility function |
|
* @event_trigger_callback() (see trace_event_triggers.c). |
|
* |
|
* @reg: Adds the trigger to the list of triggers associated with the |
|
* event, and enables the event trigger itself, after |
|
* initializing it (via the event_trigger_ops @init() function). |
|
* This is also where commands can use the @trigger_type value to |
|
* make the decision as to whether or not multiple instances of |
|
* the trigger should be allowed. This is usually implemented by |
|
* the generic utility function @register_trigger() (see |
|
* trace_event_triggers.c). |
|
* |
|
* @unreg: Removes the trigger from the list of triggers associated |
|
* with the event, and disables the event trigger itself, after |
|
* initializing it (via the event_trigger_ops @free() function). |
|
* This is usually implemented by the generic utility function |
|
* @unregister_trigger() (see trace_event_triggers.c). |
|
* |
|
* @unreg_all: An optional function called to remove all the triggers |
|
* from the list of triggers associated with the event. Called |
|
* when a trigger file is opened in truncate mode. |
|
* |
|
* @set_filter: An optional function called to parse and set a filter |
|
* for the trigger. If no @set_filter() method is set for the |
|
* event command, filters set by the user for the command will be |
|
* ignored. This is usually implemented by the generic utility |
|
* function @set_trigger_filter() (see trace_event_triggers.c). |
|
* |
|
* @get_trigger_ops: The callback function invoked to retrieve the |
|
* event_trigger_ops implementation associated with the command. |
|
* This callback function allows a single event_command to |
|
* support multiple trigger implementations via different sets of |
|
* event_trigger_ops, depending on the value of the @param |
|
* string. |
|
*/ |
|
struct event_command { |
|
struct list_head list; |
|
char *name; |
|
enum event_trigger_type trigger_type; |
|
int flags; |
|
int (*parse)(struct event_command *cmd_ops, |
|
struct trace_event_file *file, |
|
char *glob, char *cmd, |
|
char *param_and_filter); |
|
int (*reg)(char *glob, |
|
struct event_trigger_data *data, |
|
struct trace_event_file *file); |
|
void (*unreg)(char *glob, |
|
struct event_trigger_data *data, |
|
struct trace_event_file *file); |
|
void (*unreg_all)(struct trace_event_file *file); |
|
int (*set_filter)(char *filter_str, |
|
struct event_trigger_data *data, |
|
struct trace_event_file *file); |
|
struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
|
}; |
|
|
|
/** |
|
* enum event_command_flags - flags for struct event_command |
|
* |
|
* @POST_TRIGGER: A flag that says whether or not this command needs |
|
* to have its action delayed until after the current event has |
|
* been closed. Some triggers need to avoid being invoked while |
|
* an event is currently in the process of being logged, since |
|
* the trigger may itself log data into the trace buffer. Thus |
|
* we make sure the current event is committed before invoking |
|
* those triggers. To do that, the trigger invocation is split |
|
* in two - the first part checks the filter using the current |
|
* trace record; if a command has the @post_trigger flag set, it |
|
* sets a bit for itself in the return value, otherwise it |
|
* directly invokes the trigger. Once all commands have been |
|
* either invoked or set their return flag, the current record is |
|
* either committed or discarded. At that point, if any commands |
|
* have deferred their triggers, those commands are finally |
|
* invoked following the close of the current event. In other |
|
* words, if the event_trigger_ops @func() probe implementation |
|
* itself logs to the trace buffer, this flag should be set, |
|
* otherwise it can be left unspecified. |
|
* |
|
* @NEEDS_REC: A flag that says whether or not this command needs |
|
* access to the trace record in order to perform its function, |
|
* regardless of whether or not it has a filter associated with |
|
* it (filters make a trigger require access to the trace record |
|
* but are not always present). |
|
*/ |
|
enum event_command_flags { |
|
EVENT_CMD_FL_POST_TRIGGER = 1, |
|
EVENT_CMD_FL_NEEDS_REC = 2, |
|
}; |
|
|
|
static inline bool event_command_post_trigger(struct event_command *cmd_ops) |
|
{ |
|
return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; |
|
} |
|
|
|
static inline bool event_command_needs_rec(struct event_command *cmd_ops) |
|
{ |
|
return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; |
|
} |
|
|
|
extern int trace_event_enable_disable(struct trace_event_file *file, |
|
int enable, int soft_disable); |
|
extern int tracing_alloc_snapshot(void); |
|
extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); |
|
extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); |
|
|
|
extern int tracing_snapshot_cond_disable(struct trace_array *tr); |
|
extern void *tracing_cond_snapshot_data(struct trace_array *tr); |
|
|
|
extern const char *__start___trace_bprintk_fmt[]; |
|
extern const char *__stop___trace_bprintk_fmt[]; |
|
|
|
extern const char *__start___tracepoint_str[]; |
|
extern const char *__stop___tracepoint_str[]; |
|
|
|
void trace_printk_control(bool enabled); |
|
void trace_printk_start_comm(void); |
|
int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
|
int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
|
|
|
/* Used from boot time tracer */ |
|
extern int trace_set_options(struct trace_array *tr, char *option); |
|
extern int tracing_set_tracer(struct trace_array *tr, const char *buf); |
|
extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
|
unsigned long size, int cpu_id); |
|
extern int tracing_set_cpumask(struct trace_array *tr, |
|
cpumask_var_t tracing_cpumask_new); |
|
|
|
|
|
#define MAX_EVENT_NAME_LEN 64 |
|
|
|
extern ssize_t trace_parse_run_command(struct file *file, |
|
const char __user *buffer, size_t count, loff_t *ppos, |
|
int (*createfn)(const char *)); |
|
|
|
extern unsigned int err_pos(char *cmd, const char *str); |
|
extern void tracing_log_err(struct trace_array *tr, |
|
const char *loc, const char *cmd, |
|
const char **errs, u8 type, u8 pos); |
|
|
|
/* |
|
* Normal trace_printk() and friends allocates special buffers |
|
* to do the manipulation, as well as saves the print formats |
|
* into sections to display. But the trace infrastructure wants |
|
* to use these without the added overhead at the price of being |
|
* a bit slower (used mainly for warnings, where we don't care |
|
* about performance). The internal_trace_puts() is for such |
|
* a purpose. |
|
*/ |
|
#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) |
|
|
|
#undef FTRACE_ENTRY |
|
#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ |
|
extern struct trace_event_call \ |
|
__aligned(4) event_##call; |
|
#undef FTRACE_ENTRY_DUP |
|
#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ |
|
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
|
#undef FTRACE_ENTRY_PACKED |
|
#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ |
|
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
|
|
|
#include "trace_entries.h" |
|
|
|
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
|
int perf_ftrace_event_register(struct trace_event_call *call, |
|
enum trace_reg type, void *data); |
|
#else |
|
#define perf_ftrace_event_register NULL |
|
#endif |
|
|
|
#ifdef CONFIG_FTRACE_SYSCALLS |
|
void init_ftrace_syscalls(void); |
|
const char *get_syscall_name(int syscall); |
|
#else |
|
static inline void init_ftrace_syscalls(void) { } |
|
static inline const char *get_syscall_name(int syscall) |
|
{ |
|
return NULL; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_EVENT_TRACING |
|
void trace_event_init(void); |
|
void trace_event_eval_update(struct trace_eval_map **map, int len); |
|
/* Used from boot time tracer */ |
|
extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); |
|
extern int trigger_process_regex(struct trace_event_file *file, char *buff); |
|
#else |
|
static inline void __init trace_event_init(void) { } |
|
static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } |
|
#endif |
|
|
|
#ifdef CONFIG_TRACER_SNAPSHOT |
|
void tracing_snapshot_instance(struct trace_array *tr); |
|
int tracing_alloc_snapshot_instance(struct trace_array *tr); |
|
#else |
|
static inline void tracing_snapshot_instance(struct trace_array *tr) { } |
|
static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) |
|
{ |
|
return 0; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_PREEMPT_TRACER |
|
void tracer_preempt_on(unsigned long a0, unsigned long a1); |
|
void tracer_preempt_off(unsigned long a0, unsigned long a1); |
|
#else |
|
static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } |
|
static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } |
|
#endif |
|
#ifdef CONFIG_IRQSOFF_TRACER |
|
void tracer_hardirqs_on(unsigned long a0, unsigned long a1); |
|
void tracer_hardirqs_off(unsigned long a0, unsigned long a1); |
|
#else |
|
static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } |
|
static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } |
|
#endif |
|
|
|
extern struct trace_iterator *tracepoint_print_iter; |
|
|
|
/* |
|
* Reset the state of the trace_iterator so that it can read consumed data. |
|
* Normally, the trace_iterator is used for reading the data when it is not |
|
* consumed, and must retain state. |
|
*/ |
|
static __always_inline void trace_iterator_reset(struct trace_iterator *iter) |
|
{ |
|
memset_startat(iter, 0, seq); |
|
iter->pos = -1; |
|
} |
|
|
|
/* Check the name is good for event/group/fields */ |
|
static inline bool is_good_name(const char *name) |
|
{ |
|
if (!isalpha(*name) && *name != '_') |
|
return false; |
|
while (*++name != '\0') { |
|
if (!isalpha(*name) && !isdigit(*name) && *name != '_') |
|
return false; |
|
} |
|
return true; |
|
} |
|
|
|
/* Convert certain expected symbols into '_' when generating event names */ |
|
static inline void sanitize_event_name(char *name) |
|
{ |
|
while (*name++ != '\0') |
|
if (*name == ':' || *name == '.') |
|
*name = '_'; |
|
} |
|
|
|
/* |
|
* This is a generic way to read and write a u64 value from a file in tracefs. |
|
* |
|
* The value is stored on the variable pointed by *val. The value needs |
|
* to be at least *min and at most *max. The write is protected by an |
|
* existing *lock. |
|
*/ |
|
struct trace_min_max_param { |
|
struct mutex *lock; |
|
u64 *val; |
|
u64 *min; |
|
u64 *max; |
|
}; |
|
|
|
#define U64_STR_SIZE 24 /* 20 digits max */ |
|
|
|
extern const struct file_operations trace_min_max_fops; |
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|
|
|