| // SPDX-License-Identifier: GPL-2.0 |
| |
| #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/trace.h> |
| #include <linux/hw_breakpoint.h> |
| #include <linux/trace_seq.h> |
| #include <linux/trace_events.h> |
| #include <linux/compiler.h> |
| #include <linux/glob.h> |
| #include <linux/irq_work.h> |
| #include <linux/workqueue.h> |
| #include <linux/ctype.h> |
| #include <linux/once_lite.h> |
| |
| #include "pid_list.h" |
| |
| #ifdef CONFIG_FTRACE_SYSCALLS |
| #include <asm/unistd.h> /* For NR_SYSCALLS */ |
| #include <asm/syscall.h> /* some archs define it here */ |
| #endif |
| |
| #define TRACE_MODE_WRITE 0640 |
| #define TRACE_MODE_READ 0440 |
| |
| 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_HWLAT, |
| TRACE_OSNOISE, |
| TRACE_TIMERLAT, |
| TRACE_RAW_DATA, |
| TRACE_FUNC_REPEATS, |
| |
| __TRACE_LAST_TYPE, |
| }; |
| |
| |
| #undef __field |
| #define __field(type, item) type item; |
| |
| #undef __field_fn |
| #define __field_fn(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 __field_packed |
| #define __field_packed(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 __rel_dynamic_array |
| #define __rel_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) \ |
| struct struct_name { \ |
| struct trace_entry ent; \ |
| tstruct \ |
| } |
| |
| #undef FTRACE_ENTRY_DUP |
| #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) |
| |
| #undef FTRACE_ENTRY_REG |
| #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ |
| FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
| |
| #undef FTRACE_ENTRY_PACKED |
| #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ |
| FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed |
| |
| #include "trace_entries.h" |
| |
| /* Use this for memory failure errors */ |
| #define MEM_FAIL(condition, fmt, ...) \ |
| DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) |
| |
| /* |
| * 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 eprobe_trace_entry_head { |
| struct trace_entry ent; |
| }; |
| |
| struct kretprobe_trace_entry_head { |
| struct trace_entry ent; |
| unsigned long func; |
| unsigned long ret_ip; |
| }; |
| |
| #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; |
| u64 preempt_timestamp; |
| pid_t pid; |
| kuid_t uid; |
| char comm[TASK_COMM_LEN]; |
| |
| #ifdef CONFIG_FUNCTION_TRACER |
| int ftrace_ignore_pid; |
| #endif |
| bool ignore_pid; |
| }; |
| |
| struct tracer; |
| struct trace_option_dentry; |
| |
| struct array_buffer { |
| struct trace_array *tr; |
| struct trace_buffer *buffer; |
| struct trace_array_cpu __percpu *data; |
| u64 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 *trace_pid_list_alloc(void); |
| void trace_pid_list_free(struct trace_pid_list *pid_list); |
| bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); |
| int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); |
| int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); |
| int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); |
| int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, |
| unsigned int *next); |
| |
| enum { |
| TRACE_PIDS = BIT(0), |
| TRACE_NO_PIDS = BIT(1), |
| }; |
| |
| static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, |
| struct trace_pid_list *no_pid_list) |
| { |
| /* Return true if the pid list in type has pids */ |
| return ((type & TRACE_PIDS) && pid_list) || |
| ((type & TRACE_NO_PIDS) && no_pid_list); |
| } |
| |
| static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, |
| struct trace_pid_list *no_pid_list) |
| { |
| /* |
| * Turning off what is in @type, return true if the "other" |
| * pid list, still has pids in it. |
| */ |
| return (!(type & TRACE_PIDS) && pid_list) || |
| (!(type & TRACE_NO_PIDS) && no_pid_list); |
| } |
| |
| typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); |
| |
| /** |
| * struct cond_snapshot - conditional snapshot data and callback |
| * |
| * The cond_snapshot structure encapsulates a callback function and |
| * data associated with the snapshot for a given tracing instance. |
| * |
| * When a snapshot is taken conditionally, by invoking |
| * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is |
| * passed in turn to the cond_snapshot.update() function. That data |
| * can be compared by the update() implementation with the cond_data |
| * contained within the struct cond_snapshot instance associated with |
| * the trace_array. Because the tr->max_lock is held throughout the |
| * update() call, the update() function can directly retrieve the |
| * cond_snapshot and cond_data associated with the per-instance |
| * snapshot associated with the trace_array. |
| * |
| * The cond_snapshot.update() implementation can save data to be |
| * associated with the snapshot if it decides to, and returns 'true' |
| * in that case, or it returns 'false' if the conditional snapshot |
| * shouldn't be taken. |
| * |
| * The cond_snapshot instance is created and associated with the |
| * user-defined cond_data by tracing_cond_snapshot_enable(). |
| * Likewise, the cond_snapshot instance is destroyed and is no longer |
| * associated with the trace instance by |
| * tracing_cond_snapshot_disable(). |
| * |
| * The method below is required. |
| * |
| * @update: When a conditional snapshot is invoked, the update() |
| * callback function is invoked with the tr->max_lock held. The |
| * update() implementation signals whether or not to actually |
| * take the snapshot, by returning 'true' if so, 'false' if no |
| * snapshot should be taken. Because the max_lock is held for |
| * the duration of update(), the implementation is safe to |
| * directly retrieved and save any implementation data it needs |
| * to in association with the snapshot. |
| */ |
| struct cond_snapshot { |
| void *cond_data; |
| cond_update_fn_t update; |
| }; |
| |
| /* |
| * struct trace_func_repeats - used to keep track of the consecutive |
| * (on the same CPU) calls of a single function. |
| */ |
| struct trace_func_repeats { |
| unsigned long ip; |
| unsigned long parent_ip; |
| unsigned long count; |
| u64 ts_last_call; |
| }; |
| |
| /* |
| * 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 array_buffer array_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 array_buffer |
| * When a snapshot is taken, the buffer of the max_buffer is swapped |
| * with the buffer of the array_buffer and the buffers are reset for |
| * the array_buffer so the tracing can continue. |
| */ |
| struct array_buffer max_buffer; |
| bool allocated_snapshot; |
| #endif |
| #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ |
| || defined(CONFIG_OSNOISE_TRACER) |
| unsigned long max_latency; |
| #ifdef CONFIG_FSNOTIFY |
| struct dentry *d_max_latency; |
| struct work_struct fsnotify_work; |
| struct irq_work fsnotify_irqwork; |
| #endif |
| #endif |
| struct trace_pid_list __rcu *filtered_pids; |
| struct trace_pid_list __rcu *filtered_no_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; |
| bool clear_trace; |
| int buffer_percent; |
| unsigned int n_err_log_entries; |
| 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 list_head err_log; |
| 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; |
| struct trace_event_file *trace_marker_file; |
| cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
| int ref; |
| int trace_ref; |
| #ifdef CONFIG_FUNCTION_TRACER |
| struct ftrace_ops *ops; |
| struct trace_pid_list __rcu *function_pids; |
| struct trace_pid_list __rcu *function_no_pids; |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| /* All of these are protected by the ftrace_lock */ |
| struct list_head func_probes; |
| struct list_head mod_trace; |
| struct list_head mod_notrace; |
| #endif |
| /* function tracing enabled */ |
| int function_enabled; |
| #endif |
| int no_filter_buffering_ref; |
| struct list_head hist_vars; |
| #ifdef CONFIG_TRACER_SNAPSHOT |
| struct cond_snapshot *cond_snapshot; |
| #endif |
| struct trace_func_repeats __percpu *last_func_repeats; |
| }; |
| |
| 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 int tracing_check_open_get_tr(struct trace_array *tr); |
| extern struct trace_array *trace_array_find(const char *instance); |
| extern struct trace_array *trace_array_find_get(const char *instance); |
| |
| extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); |
| extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); |
| extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); |
| |
| extern bool trace_clock_in_ns(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 != 0 && (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 hwlat_entry, TRACE_HWLAT); \ |
| IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ |
| IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ |
| IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ |
| 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); \ |
| IF_ASSIGN(var, ent, struct func_repeats_entry, \ |
| TRACE_FUNC_REPEATS); \ |
| __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; |
| struct tracer *trace; |
| }; |
| |
| /* 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_on) |
| * @stop: called when tracing is paused (echo 0 > tracing_on) |
| * @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; |
| 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 (*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; |
| }; |
| |
| 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_data *data); |
| extern void event_enable_trigger_free(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_and_filter); |
| 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_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, |
| struct event_trigger_data *trigger_data); |
| extern void event_trigger_unregister(struct event_command *cmd_ops, |
| struct trace_event_file *file, |
| char *glob, |
| struct event_trigger_data *trigger_data); |
| |
| /** |
| * 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_data *data); |
| void (*free)(struct event_trigger_data *data); |
| int (*print)(struct seq_file *m, |
| 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, u16 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; |
| |
| #ifdef CONFIG_RV |
| extern int rv_init_interface(void); |
| #else |
| static inline int rv_init_interface(void) |
| { |
| return 0; |
| } |
| #endif |
| |
| #endif /* _LINUX_KERNEL_TRACE_H */ |