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Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 1945 |
1 files changed, 1945 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h new file mode 100644 index 000000000..74185fb04 --- /dev/null +++ b/kernel/trace/trace.h @@ -0,0 +1,1945 @@ +// 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/hw_breakpoint.h> +#include <linux/trace_seq.h> +#include <linux/trace_events.h> +#include <linux/compiler.h> +#include <linux/trace_seq.h> +#include <linux/glob.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_HWLAT, + TRACE_RAW_DATA, + + __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 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) + +#undef FTRACE_ENTRY_PACKED +#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ + filter) \ + FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ + filter) __packed + +#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, + TRACE_FLAG_NMI = 0x40, +}; + +#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]; + + bool ignore_pid; +#ifdef CONFIG_FUNCTION_TRACER + bool ftrace_ignore_pid; +#endif +}; + +struct tracer; +struct trace_option_dentry; + +struct trace_buffer { + struct trace_array *tr; + struct ring_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 { + int pid_max; + unsigned long *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; +#endif +#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) + 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; + bool clear_trace; + 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; + struct trace_event_file *trace_marker_file; + cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ + int ref; +#ifdef CONFIG_FUNCTION_TRACER + struct ftrace_ops *ops; + struct trace_pid_list __rcu *function_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 time_stamp_abs_ref; + struct list_head hist_vars; +}; + +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); + +extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); +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 && (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 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); \ + __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; + int ref; + 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; +}; + + +/* 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... + * The function callback, which can use the FTRACE bits to + * check for recursion. + */ +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, + TRACE_FTRACE_TRANSITION_BIT, + + /* Internal use recursion bits */ + TRACE_INTERNAL_BIT, + TRACE_INTERNAL_NMI_BIT, + TRACE_INTERNAL_IRQ_BIT, + TRACE_INTERNAL_SIRQ_BIT, + TRACE_INTERNAL_TRANSITION_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, + + /* Set if the function is in the set_graph_function file */ + TRACE_GRAPH_BIT, + + /* + * In the very unlikely case that an interrupt came in + * at a start of graph tracing, and we want to trace + * the function in that interrupt, the depth can be greater + * than zero, because of the preempted start of a previous + * trace. In an even more unlikely case, depth could be 2 + * if a softirq interrupted the start of graph tracing, + * followed by an interrupt preempting a start of graph + * tracing in the softirq, and depth can even be 3 + * if an NMI came in at the start of an interrupt function + * that preempted a softirq start of a function that + * preempted normal context!!!! Luckily, it can't be + * greater than 3, so the next two bits are a mask + * of what the depth is when we set TRACE_GRAPH_BIT + */ + + TRACE_GRAPH_DEPTH_START_BIT, + TRACE_GRAPH_DEPTH_END_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_recursion_depth() \ + (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) +#define trace_recursion_set_depth(depth) \ + do { \ + current->trace_recursion &= \ + ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ + current->trace_recursion |= \ + ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ + } while (0) + +#define TRACE_CONTEXT_BITS 4 + +#define TRACE_FTRACE_START TRACE_FTRACE_BIT + +#define TRACE_LIST_START TRACE_INTERNAL_BIT + +#define TRACE_CONTEXT_MASK ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) + +enum { + TRACE_CTX_NMI, + TRACE_CTX_IRQ, + TRACE_CTX_SOFTIRQ, + TRACE_CTX_NORMAL, + TRACE_CTX_TRANSITION, +}; + +static __always_inline int trace_get_context_bit(void) +{ + int bit; + + if (in_interrupt()) { + if (in_nmi()) + bit = TRACE_CTX_NMI; + + else if (in_irq()) + bit = TRACE_CTX_IRQ; + else + bit = TRACE_CTX_SOFTIRQ; + } else + bit = TRACE_CTX_NORMAL; + + return bit; +} + +static __always_inline int trace_test_and_set_recursion(int start) +{ + unsigned int val = current->trace_recursion; + int bit; + + bit = trace_get_context_bit() + start; + if (unlikely(val & (1 << bit))) { + /* + * It could be that preempt_count has not been updated during + * a switch between contexts. Allow for a single recursion. + */ + bit = start + TRACE_CTX_TRANSITION; + if (trace_recursion_test(bit)) + return -1; + trace_recursion_set(bit); + barrier(); + return bit; + } + + 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; + + 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) +{ + 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(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); +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); + +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 trace_buffer_unlock_commit_nostack(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); +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 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 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 trace_array *tr, + 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 trace_array *tr, + 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 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; +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 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 +/* 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(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); + +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_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 +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_irq()) + 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 +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->trace_buffer.data->ftrace_ignore_pid); +} +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); +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 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); +#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"), \ + 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 ring_buffer *buffer, + struct ring_buffer_event *event); + +void trace_buffer_unlock_commit_regs(struct trace_array *tr, + struct ring_buffer *buffer, + struct ring_buffer_event *event, + unsigned long flags, int pc, + struct pt_regs *regs); + +static inline void trace_buffer_unlock_commit(struct trace_array *tr, + struct ring_buffer *buffer, + struct ring_buffer_event *event, + unsigned long flags, int pc) +{ + trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, 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 ring_buffer *buffer, + struct ring_buffer_event *event) +{ + if (this_cpu_read(trace_buffered_event) == event) { + /* Simply release the temp buffer */ + this_cpu_dec(trace_buffered_event_cnt); + return; + } + 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 wil 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 ring_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, 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 assoctiated to 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 + * @irq_flags: The state of the interrupts at the start of the event + * @pc: The state of the preempt count at the start of the event. + * + * 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 ring_buffer *buffer, + struct ring_buffer_event *event, + void *entry, unsigned long irq_flags, int pc) +{ + 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, irq_flags, pc); + + if (tt) + event_triggers_post_call(file, tt); +} + +/** + * event_trigger_unlock_commit_regs - handle triggers and finish event commit + * @file: The file pointer assoctiated to 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 + * @irq_flags: The state of the interrupts at the start of the event + * @pc: The state of the preempt count at the start of the event. + * + * 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. + * + * Same as event_trigger_unlock_commit() but calls + * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). + */ +static inline void +event_trigger_unlock_commit_regs(struct trace_event_file *file, + struct ring_buffer *buffer, + struct ring_buffer_event *event, + void *entry, unsigned long irq_flags, int pc, + struct pt_regs *regs) +{ + enum event_trigger_type tt = ETT_NONE; + + if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) + trace_buffer_unlock_commit_regs(file->tr, buffer, event, + irq_flags, pc, regs); + + if (tt) + event_triggers_post_call(file, tt); +} + +#define FILTER_PRED_INVALID ((unsigned short)-1) +#define FILTER_PRED_IS_RIGHT (1 << 15) +#define FILTER_PRED_FOLD (1 << 15) + +/* + * The max preds is the size of unsigned short with + * two flags at the MSBs. One bit is used for both the IS_RIGHT + * and FOLD flags. The other is reserved. + * + * 2^14 preds is way more than enough. + */ +#define MAX_FILTER_PRED 16384 + +struct filter_pred; +struct regex; + +typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); + +typedef int (*regex_match_func)(char *str, struct regex *r, int len); + +enum regex_type { + MATCH_FULL = 0, + MATCH_FRONT_ONLY, + MATCH_MIDDLE_ONLY, + MATCH_END_ONLY, + MATCH_GLOB, +}; + +struct regex { + char pattern[MAX_FILTER_STR_VAL]; + int len; + int field_len; + regex_match_func match; +}; + +struct filter_pred { + filter_pred_fn_t fn; + u64 val; + struct regex regex; + unsigned short *ops; + struct ftrace_event_field *field; + int offset; + int not; + int op; +}; + +static inline bool is_string_field(struct ftrace_event_field *field) +{ + return field->filter_type == FILTER_DYN_STRING || + field->filter_type == FILTER_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_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 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; + +#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); + +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; + bool paused; + bool paused_tmp; + struct list_head list; + char *name; + struct list_head named_list; + struct event_trigger_data *named_data; +}; + +/* Avoid typos */ +#define ENABLE_EVENT_STR "enable_event" +#define DISABLE_EVENT_STR "disable_event" +#define ENABLE_HIST_STR "enable_hist" +#define DISABLE_HIST_STR "disable_hist" + +struct enable_trigger_data { + struct trace_event_file *file; + bool enable; + bool hist; +}; + +extern int event_enable_trigger_print(struct seq_file *m, + struct event_trigger_ops *ops, + struct event_trigger_data *data); +extern void event_enable_trigger_free(struct event_trigger_ops *ops, + struct event_trigger_data *data); +extern int event_enable_trigger_func(struct event_command *cmd_ops, + struct trace_event_file *file, + char *glob, char *cmd, char *param); +extern int event_enable_register_trigger(char *glob, + struct event_trigger_ops *ops, + struct event_trigger_data *data, + struct trace_event_file *file); +extern void event_enable_unregister_trigger(char *glob, + struct event_trigger_ops *ops, + struct event_trigger_data *test, + struct trace_event_file *file); +extern void trigger_data_free(struct event_trigger_data *data); +extern int event_trigger_init(struct event_trigger_ops *ops, + struct event_trigger_data *data); +extern int trace_event_trigger_enable_disable(struct trace_event_file *file, + int trigger_enable); +extern void update_cond_flag(struct trace_event_file *file); +extern int set_trigger_filter(char *filter_str, + struct event_trigger_data *trigger_data, + struct trace_event_file *file); +extern struct event_trigger_data *find_named_trigger(const char *name); +extern bool is_named_trigger(struct event_trigger_data *test); +extern int save_named_trigger(const char *name, + struct event_trigger_data *data); +extern void del_named_trigger(struct event_trigger_data *data); +extern void pause_named_trigger(struct event_trigger_data *data); +extern void unpause_named_trigger(struct event_trigger_data *data); +extern void set_named_trigger_data(struct event_trigger_data *data, + struct event_trigger_data *named_data); +extern struct event_trigger_data * +get_named_trigger_data(struct event_trigger_data *data); +extern int register_event_command(struct event_command *cmd); +extern int unregister_event_command(struct event_command *cmd); +extern int register_trigger_hist_enable_disable_cmds(void); + +/** + * 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) 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 (*func)(struct event_trigger_data *data, + void *rec, + struct ring_buffer_event *rbe); + int (*init)(struct event_trigger_ops *ops, + struct event_trigger_data *data); + void (*free)(struct event_trigger_ops *ops, + struct event_trigger_data *data); + int (*print)(struct seq_file *m, + struct event_trigger_ops *ops, + struct event_trigger_data *data); +}; + +/** + * struct event_command - callbacks and data members for event commands + * + * Event commands are invoked by users by writing the command name + * into the 'trigger' file associated with a trace event. The + * parameters associated with a specific invocation of an event + * command are used to create an event trigger instance, which is + * added to the list of trigger instances associated with that trace + * event. When the event is hit, the set of triggers associated with + * that event is invoked. + * + * The data members in this structure provide per-event command data + * for various event commands. + * + * All the data members below, except for @post_trigger, must be set + * for each event command. + * + * @name: The unique name that identifies the event command. This is + * the name used when setting triggers via trigger files. + * + * @trigger_type: A unique id that identifies the event command + * 'type'. This value has two purposes, the first to ensure that + * only one trigger of the same type can be set at a given time + * for a particular event e.g. it doesn't make sense to have both + * a traceon and traceoff trigger attached to a single event at + * the same time, so traceon and traceoff have the same type + * though they have different names. The @trigger_type value is + * also used as a bit value for deferring the actual trigger + * action until after the current event is finished. Some + * commands need to do this if they themselves log to the trace + * buffer (see the @post_trigger() member below). @trigger_type + * values are defined by adding new values to the trigger_type + * enum in include/linux/trace_events.h. + * + * @flags: See the enum event_command_flags below. + * + * All the methods below, except for @set_filter() and @unreg_all(), + * must be implemented. + * + * @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). + * + * @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. + */ +struct event_command { + struct list_head list; + char *name; + enum event_trigger_type trigger_type; + int flags; + 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); + 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 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); + +#define MAX_EVENT_NAME_LEN 64 + +extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); +extern ssize_t trace_parse_run_command(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos, + int (*createfn)(int, char**)); + +/* + * 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) +#undef FTRACE_ENTRY_PACKED +#define FTRACE_ENTRY_PACKED(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); +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); +#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) +{ + const size_t offset = offsetof(struct trace_iterator, seq); + + /* + * Keep gcc from complaining about overwriting more than just one + * member in the structure. + */ + memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); + + iter->pos = -1; +} + +#endif /* _LINUX_KERNEL_TRACE_H */ |