| |
| #ifndef _LINUX_KERNEL_TRACE_H |
| #define _LINUX_KERNEL_TRACE_H |
| |
| #include <linux/fs.h> |
| #include <linux/atomic.h> |
| #include <linux/sched.h> |
| #include <linux/clocksource.h> |
| #include <linux/ring_buffer.h> |
| #include <linux/mmiotrace.h> |
| #include <linux/tracepoint.h> |
| #include <linux/ftrace.h> |
| #include <linux/hw_breakpoint.h> |
| #include <linux/trace_seq.h> |
| #include <linux/trace_events.h> |
| #include <linux/compiler.h> |
| #include <linux/trace_seq.h> |
| |
| #ifdef CONFIG_FTRACE_SYSCALLS |
| #include <asm/unistd.h> /* For NR_SYSCALLS */ |
| #include <asm/syscall.h> /* some archs define it here */ |
| #endif |
| |
| enum trace_type { |
| __TRACE_FIRST_TYPE = 0, |
| |
| TRACE_FN, |
| TRACE_CTX, |
| TRACE_WAKE, |
| TRACE_STACK, |
| TRACE_PRINT, |
| TRACE_BPRINT, |
| TRACE_MMIO_RW, |
| TRACE_MMIO_MAP, |
| TRACE_BRANCH, |
| TRACE_GRAPH_RET, |
| TRACE_GRAPH_ENT, |
| TRACE_USER_STACK, |
| TRACE_BLK, |
| TRACE_BPUTS, |
| |
| __TRACE_LAST_TYPE, |
| }; |
| |
| |
| #undef __field |
| #define __field(type, item) type item; |
| |
| #undef __field_struct |
| #define __field_struct(type, item) __field(type, item) |
| |
| #undef __field_desc |
| #define __field_desc(type, container, item) |
| |
| #undef __array |
| #define __array(type, item, size) type item[size]; |
| |
| #undef __array_desc |
| #define __array_desc(type, container, item, size) |
| |
| #undef __dynamic_array |
| #define __dynamic_array(type, item) type item[]; |
| |
| #undef F_STRUCT |
| #define F_STRUCT(args...) args |
| |
| #undef FTRACE_ENTRY |
| #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
| struct struct_name { \ |
| struct trace_entry ent; \ |
| tstruct \ |
| } |
| |
| #undef TP_ARGS |
| #define TP_ARGS(args...) args |
| |
| #undef FTRACE_ENTRY_DUP |
| #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
| |
| #undef FTRACE_ENTRY_REG |
| #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
| filter, regfn) \ |
| FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
| filter) |
| |
| #include "trace_entries.h" |
| |
| /* |
| * syscalls are special, and need special handling, this is why |
| * they are not included in trace_entries.h |
| */ |
| struct syscall_trace_enter { |
| struct trace_entry ent; |
| int nr; |
| unsigned long args[]; |
| }; |
| |
| struct syscall_trace_exit { |
| struct trace_entry ent; |
| int nr; |
| long ret; |
| }; |
| |
| struct kprobe_trace_entry_head { |
| struct trace_entry ent; |
| unsigned long ip; |
| }; |
| |
| struct kretprobe_trace_entry_head { |
| struct trace_entry ent; |
| unsigned long func; |
| unsigned long ret_ip; |
| }; |
| |
| /* |
| * trace_flag_type is an enumeration that holds different |
| * states when a trace occurs. These are: |
| * IRQS_OFF - interrupts were disabled |
| * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
| * NEED_RESCHED - reschedule is requested |
| * HARDIRQ - inside an interrupt handler |
| * SOFTIRQ - inside a softirq handler |
| */ |
| enum trace_flag_type { |
| TRACE_FLAG_IRQS_OFF = 0x01, |
| TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
| TRACE_FLAG_NEED_RESCHED = 0x04, |
| TRACE_FLAG_HARDIRQ = 0x08, |
| TRACE_FLAG_SOFTIRQ = 0x10, |
| TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
| }; |
| |
| #define TRACE_BUF_SIZE 1024 |
| |
| struct trace_array; |
| |
| /* |
| * The CPU trace array - it consists of thousands of trace entries |
| * plus some other descriptor data: (for example which task started |
| * the trace, etc.) |
| */ |
| struct trace_array_cpu { |
| atomic_t disabled; |
| void *buffer_page; /* ring buffer spare */ |
| |
| unsigned long entries; |
| unsigned long saved_latency; |
| unsigned long critical_start; |
| unsigned long critical_end; |
| unsigned long critical_sequence; |
| unsigned long nice; |
| unsigned long policy; |
| unsigned long rt_priority; |
| unsigned long skipped_entries; |
| cycle_t preempt_timestamp; |
| pid_t pid; |
| kuid_t uid; |
| char comm[TASK_COMM_LEN]; |
| |
| bool ignore_pid; |
| }; |
| |
| struct tracer; |
| struct trace_option_dentry; |
| |
| struct trace_buffer { |
| struct trace_array *tr; |
| struct ring_buffer *buffer; |
| struct trace_array_cpu __percpu *data; |
| cycle_t time_start; |
| int cpu; |
| }; |
| |
| #define TRACE_FLAGS_MAX_SIZE 32 |
| |
| struct trace_options { |
| struct tracer *tracer; |
| struct trace_option_dentry *topts; |
| }; |
| |
| struct trace_pid_list { |
| unsigned int nr_pids; |
| int order; |
| pid_t *pids; |
| }; |
| |
| /* |
| * The trace array - an array of per-CPU trace arrays. This is the |
| * highest level data structure that individual tracers deal with. |
| * They have on/off state as well: |
| */ |
| struct trace_array { |
| struct list_head list; |
| char *name; |
| struct trace_buffer trace_buffer; |
| #ifdef CONFIG_TRACER_MAX_TRACE |
| /* |
| * The max_buffer is used to snapshot the trace when a maximum |
| * latency is reached, or when the user initiates a snapshot. |
| * Some tracers will use this to store a maximum trace while |
| * it continues examining live traces. |
| * |
| * The buffers for the max_buffer are set up the same as the trace_buffer |
| * When a snapshot is taken, the buffer of the max_buffer is swapped |
| * with the buffer of the trace_buffer and the buffers are reset for |
| * the trace_buffer so the tracing can continue. |
| */ |
| struct trace_buffer max_buffer; |
| bool allocated_snapshot; |
| unsigned long max_latency; |
| #endif |
| struct trace_pid_list __rcu *filtered_pids; |
| /* |
| * max_lock is used to protect the swapping of buffers |
| * when taking a max snapshot. The buffers themselves are |
| * protected by per_cpu spinlocks. But the action of the swap |
| * needs its own lock. |
| * |
| * This is defined as a arch_spinlock_t in order to help |
| * with performance when lockdep debugging is enabled. |
| * |
| * It is also used in other places outside the update_max_tr |
| * so it needs to be defined outside of the |
| * CONFIG_TRACER_MAX_TRACE. |
| */ |
| arch_spinlock_t max_lock; |
| int buffer_disabled; |
| #ifdef CONFIG_FTRACE_SYSCALLS |
| int sys_refcount_enter; |
| int sys_refcount_exit; |
| struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
| struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; |
| #endif |
| int stop_count; |
| int clock_id; |
| int nr_topts; |
| struct tracer *current_trace; |
| unsigned int trace_flags; |
| unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
| unsigned int flags; |
| raw_spinlock_t start_lock; |
| struct dentry *dir; |
| struct dentry *options; |
| struct dentry *percpu_dir; |
| struct dentry *event_dir; |
| struct trace_options *topts; |
| struct list_head systems; |
| struct list_head events; |
| cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
| int ref; |
| #ifdef CONFIG_FUNCTION_TRACER |
| struct ftrace_ops *ops; |
| /* function tracing enabled */ |
| int function_enabled; |
| #endif |
| }; |
| |
| enum { |
| TRACE_ARRAY_FL_GLOBAL = (1 << 0) |
| }; |
| |
| extern struct list_head ftrace_trace_arrays; |
| |
| extern struct mutex trace_types_lock; |
| |
| extern int trace_array_get(struct trace_array *tr); |
| extern void trace_array_put(struct trace_array *tr); |
| |
| /* |
| * The global tracer (top) should be the first trace array added, |
| * but we check the flag anyway. |
| */ |
| static inline struct trace_array *top_trace_array(void) |
| { |
| struct trace_array *tr; |
| |
| if (list_empty(&ftrace_trace_arrays)) |
| return NULL; |
| |
| tr = list_entry(ftrace_trace_arrays.prev, |
| typeof(*tr), list); |
| WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); |
| return tr; |
| } |
| |
| #define FTRACE_CMP_TYPE(var, type) \ |
| __builtin_types_compatible_p(typeof(var), type *) |
| |
| #undef IF_ASSIGN |
| #define IF_ASSIGN(var, entry, etype, id) \ |
| if (FTRACE_CMP_TYPE(var, etype)) { \ |
| var = (typeof(var))(entry); \ |
| WARN_ON(id && (entry)->type != id); \ |
| break; \ |
| } |
| |
| /* Will cause compile errors if type is not found. */ |
| extern void __ftrace_bad_type(void); |
| |
| /* |
| * The trace_assign_type is a verifier that the entry type is |
| * the same as the type being assigned. To add new types simply |
| * add a line with the following format: |
| * |
| * IF_ASSIGN(var, ent, type, id); |
| * |
| * Where "type" is the trace type that includes the trace_entry |
| * as the "ent" item. And "id" is the trace identifier that is |
| * used in the trace_type enum. |
| * |
| * If the type can have more than one id, then use zero. |
| */ |
| #define trace_assign_type(var, ent) \ |
| do { \ |
| IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ |
| IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ |
| IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
| IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
| IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
| IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
| IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
| IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
| TRACE_MMIO_RW); \ |
| IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ |
| TRACE_MMIO_MAP); \ |
| IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
| IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
| TRACE_GRAPH_ENT); \ |
| IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ |
| TRACE_GRAPH_RET); \ |
| __ftrace_bad_type(); \ |
| } while (0) |
| |
| /* |
| * An option specific to a tracer. This is a boolean value. |
| * The bit is the bit index that sets its value on the |
| * flags value in struct tracer_flags. |
| */ |
| struct tracer_opt { |
| const char *name; /* Will appear on the trace_options file */ |
| u32 bit; /* Mask assigned in val field in tracer_flags */ |
| }; |
| |
| /* |
| * The set of specific options for a tracer. Your tracer |
| * have to set the initial value of the flags val. |
| */ |
| struct tracer_flags { |
| u32 val; |
| struct tracer_opt *opts; |
| }; |
| |
| /* Makes more easy to define a tracer opt */ |
| #define TRACER_OPT(s, b) .name = #s, .bit = b |
| |
| |
| struct trace_option_dentry { |
| struct tracer_opt *opt; |
| struct tracer_flags *flags; |
| struct trace_array *tr; |
| struct dentry *entry; |
| }; |
| |
| /** |
| * struct tracer - a specific tracer and its callbacks to interact with tracefs |
| * @name: the name chosen to select it on the available_tracers file |
| * @init: called when one switches to this tracer (echo name > current_tracer) |
| * @reset: called when one switches to another tracer |
| * @start: called when tracing is unpaused (echo 1 > tracing_enabled) |
| * @stop: called when tracing is paused (echo 0 > tracing_enabled) |
| * @update_thresh: called when tracing_thresh is updated |
| * @open: called when the trace file is opened |
| * @pipe_open: called when the trace_pipe file is opened |
| * @close: called when the trace file is released |
| * @pipe_close: called when the trace_pipe file is released |
| * @read: override the default read callback on trace_pipe |
| * @splice_read: override the default splice_read callback on trace_pipe |
| * @selftest: selftest to run on boot (see trace_selftest.c) |
| * @print_headers: override the first lines that describe your columns |
| * @print_line: callback that prints a trace |
| * @set_flag: signals one of your private flags changed (trace_options file) |
| * @flags: your private flags |
| */ |
| struct tracer { |
| const char *name; |
| int (*init)(struct trace_array *tr); |
| void (*reset)(struct trace_array *tr); |
| void (*start)(struct trace_array *tr); |
| void (*stop)(struct trace_array *tr); |
| int (*update_thresh)(struct trace_array *tr); |
| void (*open)(struct trace_iterator *iter); |
| void (*pipe_open)(struct trace_iterator *iter); |
| void (*close)(struct trace_iterator *iter); |
| void (*pipe_close)(struct trace_iterator *iter); |
| ssize_t (*read)(struct trace_iterator *iter, |
| struct file *filp, char __user *ubuf, |
| size_t cnt, loff_t *ppos); |
| ssize_t (*splice_read)(struct trace_iterator *iter, |
| struct file *filp, |
| loff_t *ppos, |
| struct pipe_inode_info *pipe, |
| size_t len, |
| unsigned int flags); |
| #ifdef CONFIG_FTRACE_STARTUP_TEST |
| int (*selftest)(struct tracer *trace, |
| struct trace_array *tr); |
| #endif |
| void (*print_header)(struct seq_file *m); |
| enum print_line_t (*print_line)(struct trace_iterator *iter); |
| /* If you handled the flag setting, return 0 */ |
| int (*set_flag)(struct trace_array *tr, |
| 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; |
| int ref; |
| bool print_max; |
| bool allow_instances; |
| #ifdef CONFIG_TRACER_MAX_TRACE |
| bool use_max_tr; |
| #endif |
| }; |
| |
| |
| /* Only current can touch trace_recursion */ |
| |
| /* |
| * For function tracing recursion: |
| * The order of these bits are important. |
| * |
| * When function tracing occurs, the following steps are made: |
| * If arch does not support a ftrace feature: |
| * call internal function (uses INTERNAL bits) which calls... |
| * If callback is registered to the "global" list, the list |
| * function is called and recursion checks the GLOBAL bits. |
| * then this function calls... |
| * The function callback, which can use the FTRACE bits to |
| * check for recursion. |
| * |
| * Now if the arch does not suppport a feature, and it calls |
| * the global list function which calls the ftrace callback |
| * all three of these steps will do a recursion protection. |
| * There's no reason to do one if the previous caller already |
| * did. The recursion that we are protecting against will |
| * go through the same steps again. |
| * |
| * To prevent the multiple recursion checks, if a recursion |
| * bit is set that is higher than the MAX bit of the current |
| * check, then we know that the check was made by the previous |
| * caller, and we can skip the current check. |
| */ |
| enum { |
| TRACE_BUFFER_BIT, |
| TRACE_BUFFER_NMI_BIT, |
| TRACE_BUFFER_IRQ_BIT, |
| TRACE_BUFFER_SIRQ_BIT, |
| |
| /* Start of function recursion bits */ |
| TRACE_FTRACE_BIT, |
| TRACE_FTRACE_NMI_BIT, |
| TRACE_FTRACE_IRQ_BIT, |
| TRACE_FTRACE_SIRQ_BIT, |
| |
| /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
| TRACE_INTERNAL_BIT, |
| TRACE_INTERNAL_NMI_BIT, |
| TRACE_INTERNAL_IRQ_BIT, |
| TRACE_INTERNAL_SIRQ_BIT, |
| |
| TRACE_CONTROL_BIT, |
| |
| TRACE_BRANCH_BIT, |
| /* |
| * Abuse of the trace_recursion. |
| * As we need a way to maintain state if we are tracing the function |
| * graph in irq because we want to trace a particular function that |
| * was called in irq context but we have irq tracing off. Since this |
| * can only be modified by current, we can reuse trace_recursion. |
| */ |
| TRACE_IRQ_BIT, |
| }; |
| |
| #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
| #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) |
| #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) |
| |
| #define TRACE_CONTEXT_BITS 4 |
| |
| #define TRACE_FTRACE_START TRACE_FTRACE_BIT |
| #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) |
| |
| #define TRACE_LIST_START TRACE_INTERNAL_BIT |
| #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) |
| |
| #define TRACE_CONTEXT_MASK TRACE_LIST_MAX |
| |
| static __always_inline int trace_get_context_bit(void) |
| { |
| int bit; |
| |
| if (in_interrupt()) { |
| if (in_nmi()) |
| bit = 0; |
| |
| else if (in_irq()) |
| bit = 1; |
| else |
| bit = 2; |
| } else |
| bit = 3; |
| |
| return bit; |
| } |
| |
| static __always_inline int trace_test_and_set_recursion(int start, int max) |
| { |
| unsigned int val = current->trace_recursion; |
| int bit; |
| |
| /* A previous recursion check was made */ |
| if ((val & TRACE_CONTEXT_MASK) > max) |
| return 0; |
| |
| bit = trace_get_context_bit() + start; |
| if (unlikely(val & (1 << bit))) |
| return -1; |
| |
| val |= 1 << bit; |
| current->trace_recursion = val; |
| barrier(); |
| |
| return bit; |
| } |
| |
| static __always_inline void trace_clear_recursion(int bit) |
| { |
| unsigned int val = current->trace_recursion; |
| |
| if (!bit) |
| return; |
| |
| bit = 1 << bit; |
| val &= ~bit; |
| |
| barrier(); |
| current->trace_recursion = val; |
| } |
| |
| static inline struct ring_buffer_iter * |
| trace_buffer_iter(struct trace_iterator *iter, int cpu) |
| { |
| if (iter->buffer_iter && iter->buffer_iter[cpu]) |
| return iter->buffer_iter[cpu]; |
| return NULL; |
| } |
| |
| int tracer_init(struct tracer *t, struct trace_array *tr); |
| int tracing_is_enabled(void); |
| void tracing_reset(struct trace_buffer *buf, int cpu); |
| void tracing_reset_online_cpus(struct trace_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); |
| bool tracing_is_disabled(void); |
| struct dentry *trace_create_file(const char *name, |
| umode_t mode, |
| struct dentry *parent, |
| void *data, |
| const struct file_operations *fops); |
| |
| struct dentry *tracing_init_dentry(void); |
| |
| struct ring_buffer_event; |
| |
| struct ring_buffer_event * |
| trace_buffer_lock_reserve(struct ring_buffer *buffer, |
| int type, |
| unsigned long len, |
| unsigned long flags, |
| int pc); |
| |
| struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
| struct trace_array_cpu *data); |
| |
| struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
| int *ent_cpu, u64 *ent_ts); |
| |
| void __buffer_unlock_commit(struct ring_buffer *buffer, |
| struct ring_buffer_event *event); |
| |
| 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); |
| |
| void trace_function(struct trace_array *tr, |
| unsigned long ip, |
| unsigned long parent_ip, |
| unsigned long flags, int pc); |
| void trace_graph_function(struct trace_array *tr, |
| unsigned long ip, |
| unsigned long parent_ip, |
| unsigned long flags, int pc); |
| 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); |
| int trace_empty(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); |
| 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; |
| |
| #ifdef CONFIG_TRACER_MAX_TRACE |
| void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
| void update_max_tr_single(struct trace_array *tr, |
| struct task_struct *tsk, int cpu); |
| #endif /* CONFIG_TRACER_MAX_TRACE */ |
| |
| #ifdef CONFIG_STACKTRACE |
| void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
| int pc); |
| |
| void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
| int pc); |
| #else |
| static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
| unsigned long flags, int pc) |
| { |
| } |
| |
| static inline void __trace_stack(struct trace_array *tr, unsigned long flags, |
| int skip, int pc) |
| { |
| } |
| #endif /* CONFIG_STACKTRACE */ |
| |
| extern cycle_t ftrace_now(int cpu); |
| |
| extern void trace_find_cmdline(int pid, char comm[]); |
| |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| extern unsigned long ftrace_update_tot_cnt; |
| #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; |
| DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
| |
| #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 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_sched_switch(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 |
| /* 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(cycle_t 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(struct trace_array *tr, |
| unsigned long ip, const char *fmt, ...); |
| int trace_array_printk_buf(struct ring_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); |
| |
| /* 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_IRQS 0x40 |
| #define TRACE_GRAPH_PRINT_TAIL 0x80 |
| #define TRACE_GRAPH_SLEEP_TIME 0x100 |
| #define TRACE_GRAPH_GRAPH_TIME 0x200 |
| #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); |
| extern void ftrace_graph_graph_time_control(bool enable); |
| |
| 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 long flags, int pc); |
| extern void __trace_graph_return(struct trace_array *tr, |
| struct ftrace_graph_ret *trace, |
| unsigned long flags, int pc); |
| |
| |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| /* TODO: make this variable */ |
| #define FTRACE_GRAPH_MAX_FUNCS 32 |
| extern int ftrace_graph_count; |
| extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; |
| extern int ftrace_graph_notrace_count; |
| extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; |
| |
| static inline int ftrace_graph_addr(unsigned long addr) |
| { |
| int i; |
| |
| if (!ftrace_graph_count) |
| return 1; |
| |
| for (i = 0; i < ftrace_graph_count; i++) { |
| if (addr == ftrace_graph_funcs[i]) { |
| /* |
| * 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_irq()) |
| trace_recursion_set(TRACE_IRQ_BIT); |
| else |
| trace_recursion_clear(TRACE_IRQ_BIT); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static inline int ftrace_graph_notrace_addr(unsigned long addr) |
| { |
| int i; |
| |
| if (!ftrace_graph_notrace_count) |
| return 0; |
| |
| for (i = 0; i < ftrace_graph_notrace_count; i++) { |
| if (addr == ftrace_graph_notrace_funcs[i]) |
| return 1; |
| } |
| |
| return 0; |
| } |
| #else |
| static inline int ftrace_graph_addr(unsigned long addr) |
| { |
| return 1; |
| } |
| |
| static inline int ftrace_graph_notrace_addr(unsigned long addr) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_DYNAMIC_FTRACE */ |
| #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 |
| extern bool ftrace_filter_param __initdata; |
| static inline int ftrace_trace_task(struct task_struct *task) |
| { |
| if (list_empty(&ftrace_pids)) |
| return 1; |
| |
| return test_tsk_trace_trace(task); |
| } |
| 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); |
| 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); |
| int using_ftrace_ops_list_func(void); |
| #else |
| static inline int ftrace_trace_task(struct task_struct *task) |
| { |
| 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 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) { } |
| /* 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) |
| void ftrace_create_filter_files(struct ftrace_ops *ops, |
| struct dentry *parent); |
| void ftrace_destroy_filter_files(struct ftrace_ops *ops); |
| #else |
| /* |
| * 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 */ |
| |
| int 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"), |
| # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION |
| #else |
| # define FUNCTION_FLAGS |
| # define FUNCTION_DEFAULT_FLAGS 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(OVERWRITE, "overwrite"), \ |
| C(STOP_ON_FREE, "disable_on_free"), \ |
| C(IRQ_INFO, "irq-info"), \ |
| C(MARKERS, "markers"), \ |
| 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 event_filter { |
| int n_preds; /* Number assigned */ |
| int a_preds; /* allocated */ |
| struct filter_pred *preds; |
| struct filter_pred *root; |
| 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; |
| }; |
| |
| #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, |
| }; |
| |
| 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; |
| unsigned short index; |
| unsigned short parent; |
| unsigned short left; |
| unsigned short right; |
| }; |
| |
| 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_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 int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
| extern int event_trace_del_tracer(struct trace_array *tr); |
| |
| 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 ACCESS_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 int register_trigger_cmds(void); |
| extern void clear_event_triggers(struct trace_array *tr); |
| |
| struct event_trigger_data { |
| unsigned long count; |
| int ref; |
| struct event_trigger_ops *ops; |
| struct event_command *cmd_ops; |
| struct event_filter __rcu *filter; |
| char *filter_str; |
| void *private_data; |
| struct list_head list; |
| }; |
| |
| /** |
| * struct event_trigger_ops - callbacks for trace event triggers |
| * |
| * The methods in this structure provide per-event trigger hooks for |
| * various trigger operations. |
| * |
| * All the methods below, except for @init() and @free(), must be |
| * implemented. |
| * |
| * @func: 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). |
| * |
| * @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 (*func)(struct event_trigger_data *data); |
| 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. |
| * |
| * @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. |
| * |
| * All the methods below, except for @set_filter(), must be |
| * implemented. |
| * |
| * @func: 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). |
| * |
| * @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. |
| */ |
| struct event_command { |
| struct list_head list; |
| char *name; |
| enum event_trigger_type trigger_type; |
| bool post_trigger; |
| int (*func)(struct event_command *cmd_ops, |
| struct trace_event_file *file, |
| char *glob, char *cmd, char *params); |
| int (*reg)(char *glob, |
| struct event_trigger_ops *ops, |
| struct event_trigger_data *data, |
| struct trace_event_file *file); |
| void (*unreg)(char *glob, |
| struct event_trigger_ops *ops, |
| struct event_trigger_data *data, |
| 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); |
| }; |
| |
| extern int trace_event_enable_disable(struct trace_event_file *file, |
| int enable, int soft_disable); |
| extern int tracing_alloc_snapshot(void); |
| |
| 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_init_buffers(void); |
| 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); |
| |
| /* |
| * 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, filter) \ |
| extern struct trace_event_call \ |
| __aligned(4) event_##call; |
| #undef FTRACE_ENTRY_DUP |
| #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
| FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
| filter) |
| #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); |
| #else |
| static inline void init_ftrace_syscalls(void) { } |
| #endif |
| |
| #ifdef CONFIG_EVENT_TRACING |
| void trace_event_init(void); |
| void trace_event_enum_update(struct trace_enum_map **map, int len); |
| #else |
| static inline void __init trace_event_init(void) { } |
| static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
| #endif |
| |
| extern struct trace_iterator *tracepoint_print_iter; |
| |
| #endif /* _LINUX_KERNEL_TRACE_H */ |