Root/kernel/trace/trace.h

1#ifndef _LINUX_KERNEL_TRACE_H
2#define _LINUX_KERNEL_TRACE_H
3
4#include <linux/fs.h>
5#include <asm/atomic.h>
6#include <linux/sched.h>
7#include <linux/clocksource.h>
8#include <linux/ring_buffer.h>
9#include <linux/mmiotrace.h>
10#include <linux/tracepoint.h>
11#include <linux/ftrace.h>
12#include <linux/hw_breakpoint.h>
13#include <linux/trace_seq.h>
14#include <linux/ftrace_event.h>
15
16enum trace_type {
17    __TRACE_FIRST_TYPE = 0,
18
19    TRACE_FN,
20    TRACE_CTX,
21    TRACE_WAKE,
22    TRACE_STACK,
23    TRACE_PRINT,
24    TRACE_BPRINT,
25    TRACE_MMIO_RW,
26    TRACE_MMIO_MAP,
27    TRACE_BRANCH,
28    TRACE_GRAPH_RET,
29    TRACE_GRAPH_ENT,
30    TRACE_USER_STACK,
31    TRACE_BLK,
32
33    __TRACE_LAST_TYPE,
34};
35
36
37#undef __field
38#define __field(type, item) type item;
39
40#undef __field_struct
41#define __field_struct(type, item) __field(type, item)
42
43#undef __field_desc
44#define __field_desc(type, container, item)
45
46#undef __array
47#define __array(type, item, size) type item[size];
48
49#undef __array_desc
50#define __array_desc(type, container, item, size)
51
52#undef __dynamic_array
53#define __dynamic_array(type, item) type item[];
54
55#undef F_STRUCT
56#define F_STRUCT(args...) args
57
58#undef FTRACE_ENTRY
59#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
60    struct struct_name { \
61        struct trace_entry ent; \
62        tstruct \
63    }
64
65#undef TP_ARGS
66#define TP_ARGS(args...) args
67
68#undef FTRACE_ENTRY_DUP
69#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
70
71#include "trace_entries.h"
72
73/*
74 * syscalls are special, and need special handling, this is why
75 * they are not included in trace_entries.h
76 */
77struct syscall_trace_enter {
78    struct trace_entry ent;
79    int nr;
80    unsigned long args[];
81};
82
83struct syscall_trace_exit {
84    struct trace_entry ent;
85    int nr;
86    long ret;
87};
88
89struct kprobe_trace_entry_head {
90    struct trace_entry ent;
91    unsigned long ip;
92};
93
94struct kretprobe_trace_entry_head {
95    struct trace_entry ent;
96    unsigned long func;
97    unsigned long ret_ip;
98};
99
100/*
101 * trace_flag_type is an enumeration that holds different
102 * states when a trace occurs. These are:
103 * IRQS_OFF - interrupts were disabled
104 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
105 * NEED_RESCHED - reschedule is requested
106 * HARDIRQ - inside an interrupt handler
107 * SOFTIRQ - inside a softirq handler
108 */
109enum trace_flag_type {
110    TRACE_FLAG_IRQS_OFF = 0x01,
111    TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
112    TRACE_FLAG_NEED_RESCHED = 0x04,
113    TRACE_FLAG_HARDIRQ = 0x08,
114    TRACE_FLAG_SOFTIRQ = 0x10,
115};
116
117#define TRACE_BUF_SIZE 1024
118
119/*
120 * The CPU trace array - it consists of thousands of trace entries
121 * plus some other descriptor data: (for example which task started
122 * the trace, etc.)
123 */
124struct trace_array_cpu {
125    atomic_t disabled;
126    void *buffer_page; /* ring buffer spare */
127
128    unsigned long saved_latency;
129    unsigned long critical_start;
130    unsigned long critical_end;
131    unsigned long critical_sequence;
132    unsigned long nice;
133    unsigned long policy;
134    unsigned long rt_priority;
135    unsigned long skipped_entries;
136    cycle_t preempt_timestamp;
137    pid_t pid;
138    uid_t uid;
139    char comm[TASK_COMM_LEN];
140};
141
142/*
143 * The trace array - an array of per-CPU trace arrays. This is the
144 * highest level data structure that individual tracers deal with.
145 * They have on/off state as well:
146 */
147struct trace_array {
148    struct ring_buffer *buffer;
149    unsigned long entries;
150    int cpu;
151    cycle_t time_start;
152    struct task_struct *waiter;
153    struct trace_array_cpu *data[NR_CPUS];
154};
155
156#define FTRACE_CMP_TYPE(var, type) \
157    __builtin_types_compatible_p(typeof(var), type *)
158
159#undef IF_ASSIGN
160#define IF_ASSIGN(var, entry, etype, id) \
161    if (FTRACE_CMP_TYPE(var, etype)) { \
162        var = (typeof(var))(entry); \
163        WARN_ON(id && (entry)->type != id); \
164        break; \
165    }
166
167/* Will cause compile errors if type is not found. */
168extern void __ftrace_bad_type(void);
169
170/*
171 * The trace_assign_type is a verifier that the entry type is
172 * the same as the type being assigned. To add new types simply
173 * add a line with the following format:
174 *
175 * IF_ASSIGN(var, ent, type, id);
176 *
177 * Where "type" is the trace type that includes the trace_entry
178 * as the "ent" item. And "id" is the trace identifier that is
179 * used in the trace_type enum.
180 *
181 * If the type can have more than one id, then use zero.
182 */
183#define trace_assign_type(var, ent) \
184    do { \
185        IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
186        IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
187        IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
188        IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
189        IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
190        IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
191        IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
192              TRACE_MMIO_RW); \
193        IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
194              TRACE_MMIO_MAP); \
195        IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
196        IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
197              TRACE_GRAPH_ENT); \
198        IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
199              TRACE_GRAPH_RET); \
200        __ftrace_bad_type(); \
201    } while (0)
202
203/*
204 * An option specific to a tracer. This is a boolean value.
205 * The bit is the bit index that sets its value on the
206 * flags value in struct tracer_flags.
207 */
208struct tracer_opt {
209    const char *name; /* Will appear on the trace_options file */
210    u32 bit; /* Mask assigned in val field in tracer_flags */
211};
212
213/*
214 * The set of specific options for a tracer. Your tracer
215 * have to set the initial value of the flags val.
216 */
217struct tracer_flags {
218    u32 val;
219    struct tracer_opt *opts;
220};
221
222/* Makes more easy to define a tracer opt */
223#define TRACER_OPT(s, b) .name = #s, .bit = b
224
225
226/**
227 * struct tracer - a specific tracer and its callbacks to interact with debugfs
228 * @name: the name chosen to select it on the available_tracers file
229 * @init: called when one switches to this tracer (echo name > current_tracer)
230 * @reset: called when one switches to another tracer
231 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
232 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
233 * @open: called when the trace file is opened
234 * @pipe_open: called when the trace_pipe file is opened
235 * @wait_pipe: override how the user waits for traces on trace_pipe
236 * @close: called when the trace file is released
237 * @pipe_close: called when the trace_pipe file is released
238 * @read: override the default read callback on trace_pipe
239 * @splice_read: override the default splice_read callback on trace_pipe
240 * @selftest: selftest to run on boot (see trace_selftest.c)
241 * @print_headers: override the first lines that describe your columns
242 * @print_line: callback that prints a trace
243 * @set_flag: signals one of your private flags changed (trace_options file)
244 * @flags: your private flags
245 */
246struct tracer {
247    const char *name;
248    int (*init)(struct trace_array *tr);
249    void (*reset)(struct trace_array *tr);
250    void (*start)(struct trace_array *tr);
251    void (*stop)(struct trace_array *tr);
252    void (*open)(struct trace_iterator *iter);
253    void (*pipe_open)(struct trace_iterator *iter);
254    void (*wait_pipe)(struct trace_iterator *iter);
255    void (*close)(struct trace_iterator *iter);
256    void (*pipe_close)(struct trace_iterator *iter);
257    ssize_t (*read)(struct trace_iterator *iter,
258                    struct file *filp, char __user *ubuf,
259                    size_t cnt, loff_t *ppos);
260    ssize_t (*splice_read)(struct trace_iterator *iter,
261                           struct file *filp,
262                           loff_t *ppos,
263                           struct pipe_inode_info *pipe,
264                           size_t len,
265                           unsigned int flags);
266#ifdef CONFIG_FTRACE_STARTUP_TEST
267    int (*selftest)(struct tracer *trace,
268                        struct trace_array *tr);
269#endif
270    void (*print_header)(struct seq_file *m);
271    enum print_line_t (*print_line)(struct trace_iterator *iter);
272    /* If you handled the flag setting, return 0 */
273    int (*set_flag)(u32 old_flags, u32 bit, int set);
274    struct tracer *next;
275    struct tracer_flags *flags;
276    int print_max;
277    int use_max_tr;
278};
279
280
281#define TRACE_PIPE_ALL_CPU -1
282
283int tracer_init(struct tracer *t, struct trace_array *tr);
284int tracing_is_enabled(void);
285void trace_wake_up(void);
286void tracing_reset(struct trace_array *tr, int cpu);
287void tracing_reset_online_cpus(struct trace_array *tr);
288void tracing_reset_current(int cpu);
289void tracing_reset_current_online_cpus(void);
290int tracing_open_generic(struct inode *inode, struct file *filp);
291struct dentry *trace_create_file(const char *name,
292                 mode_t mode,
293                 struct dentry *parent,
294                 void *data,
295                 const struct file_operations *fops);
296
297struct dentry *tracing_init_dentry(void);
298
299struct ring_buffer_event;
300
301struct ring_buffer_event *
302trace_buffer_lock_reserve(struct ring_buffer *buffer,
303              int type,
304              unsigned long len,
305              unsigned long flags,
306              int pc);
307void trace_buffer_unlock_commit(struct ring_buffer *buffer,
308                struct ring_buffer_event *event,
309                unsigned long flags, int pc);
310
311struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
312                        struct trace_array_cpu *data);
313
314struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
315                      int *ent_cpu, u64 *ent_ts);
316
317int trace_empty(struct trace_iterator *iter);
318
319void *trace_find_next_entry_inc(struct trace_iterator *iter);
320
321void trace_init_global_iter(struct trace_iterator *iter);
322
323void tracing_iter_reset(struct trace_iterator *iter, int cpu);
324
325void default_wait_pipe(struct trace_iterator *iter);
326void poll_wait_pipe(struct trace_iterator *iter);
327
328void ftrace(struct trace_array *tr,
329                struct trace_array_cpu *data,
330                unsigned long ip,
331                unsigned long parent_ip,
332                unsigned long flags, int pc);
333void tracing_sched_switch_trace(struct trace_array *tr,
334                struct task_struct *prev,
335                struct task_struct *next,
336                unsigned long flags, int pc);
337
338void tracing_sched_wakeup_trace(struct trace_array *tr,
339                struct task_struct *wakee,
340                struct task_struct *cur,
341                unsigned long flags, int pc);
342void trace_function(struct trace_array *tr,
343            unsigned long ip,
344            unsigned long parent_ip,
345            unsigned long flags, int pc);
346void trace_graph_function(struct trace_array *tr,
347            unsigned long ip,
348            unsigned long parent_ip,
349            unsigned long flags, int pc);
350void trace_default_header(struct seq_file *m);
351void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
352int trace_empty(struct trace_iterator *iter);
353
354void trace_graph_return(struct ftrace_graph_ret *trace);
355int trace_graph_entry(struct ftrace_graph_ent *trace);
356void set_graph_array(struct trace_array *tr);
357
358void tracing_start_cmdline_record(void);
359void tracing_stop_cmdline_record(void);
360void tracing_sched_switch_assign_trace(struct trace_array *tr);
361void tracing_stop_sched_switch_record(void);
362void tracing_start_sched_switch_record(void);
363int register_tracer(struct tracer *type);
364void unregister_tracer(struct tracer *type);
365int is_tracing_stopped(void);
366enum trace_file_type {
367    TRACE_FILE_LAT_FMT = 1,
368    TRACE_FILE_ANNOTATE = 2,
369};
370
371extern cpumask_var_t __read_mostly tracing_buffer_mask;
372
373#define for_each_tracing_cpu(cpu) \
374    for_each_cpu(cpu, tracing_buffer_mask)
375
376extern unsigned long nsecs_to_usecs(unsigned long nsecs);
377
378extern unsigned long tracing_thresh;
379
380#ifdef CONFIG_TRACER_MAX_TRACE
381extern unsigned long tracing_max_latency;
382
383void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
384void update_max_tr_single(struct trace_array *tr,
385              struct task_struct *tsk, int cpu);
386#endif /* CONFIG_TRACER_MAX_TRACE */
387
388#ifdef CONFIG_STACKTRACE
389void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
390            int skip, int pc);
391
392void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
393                int pc);
394
395void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
396           int pc);
397#else
398static inline void ftrace_trace_stack(struct ring_buffer *buffer,
399                      unsigned long flags, int skip, int pc)
400{
401}
402
403static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
404                      unsigned long flags, int pc)
405{
406}
407
408static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
409                 int skip, int pc)
410{
411}
412#endif /* CONFIG_STACKTRACE */
413
414extern cycle_t ftrace_now(int cpu);
415
416extern void trace_find_cmdline(int pid, char comm[]);
417
418#ifdef CONFIG_DYNAMIC_FTRACE
419extern unsigned long ftrace_update_tot_cnt;
420#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
421extern int DYN_FTRACE_TEST_NAME(void);
422#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
423extern int DYN_FTRACE_TEST_NAME2(void);
424#endif
425
426extern int ring_buffer_expanded;
427extern bool tracing_selftest_disabled;
428DECLARE_PER_CPU(int, ftrace_cpu_disabled);
429
430#ifdef CONFIG_FTRACE_STARTUP_TEST
431extern int trace_selftest_startup_function(struct tracer *trace,
432                       struct trace_array *tr);
433extern int trace_selftest_startup_function_graph(struct tracer *trace,
434                         struct trace_array *tr);
435extern int trace_selftest_startup_irqsoff(struct tracer *trace,
436                      struct trace_array *tr);
437extern int trace_selftest_startup_preemptoff(struct tracer *trace,
438                         struct trace_array *tr);
439extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
440                         struct trace_array *tr);
441extern int trace_selftest_startup_wakeup(struct tracer *trace,
442                     struct trace_array *tr);
443extern int trace_selftest_startup_nop(struct tracer *trace,
444                     struct trace_array *tr);
445extern int trace_selftest_startup_sched_switch(struct tracer *trace,
446                           struct trace_array *tr);
447extern int trace_selftest_startup_branch(struct tracer *trace,
448                     struct trace_array *tr);
449#endif /* CONFIG_FTRACE_STARTUP_TEST */
450
451extern void *head_page(struct trace_array_cpu *data);
452extern unsigned long long ns2usecs(cycle_t nsec);
453extern int
454trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
455extern int
456trace_vprintk(unsigned long ip, const char *fmt, va_list args);
457extern int
458trace_array_vprintk(struct trace_array *tr,
459            unsigned long ip, const char *fmt, va_list args);
460int trace_array_printk(struct trace_array *tr,
461               unsigned long ip, const char *fmt, ...);
462void trace_printk_seq(struct trace_seq *s);
463enum print_line_t print_trace_line(struct trace_iterator *iter);
464
465extern unsigned long trace_flags;
466
467extern int trace_clock_id;
468
469/* Standard output formatting function used for function return traces */
470#ifdef CONFIG_FUNCTION_GRAPH_TRACER
471
472/* Flag options */
473#define TRACE_GRAPH_PRINT_OVERRUN 0x1
474#define TRACE_GRAPH_PRINT_CPU 0x2
475#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
476#define TRACE_GRAPH_PRINT_PROC 0x8
477#define TRACE_GRAPH_PRINT_DURATION 0x10
478#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
479
480extern enum print_line_t
481print_graph_function_flags(struct trace_iterator *iter, u32 flags);
482extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
483extern enum print_line_t
484trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
485extern void graph_trace_open(struct trace_iterator *iter);
486extern void graph_trace_close(struct trace_iterator *iter);
487extern int __trace_graph_entry(struct trace_array *tr,
488                   struct ftrace_graph_ent *trace,
489                   unsigned long flags, int pc);
490extern void __trace_graph_return(struct trace_array *tr,
491                 struct ftrace_graph_ret *trace,
492                 unsigned long flags, int pc);
493
494
495#ifdef CONFIG_DYNAMIC_FTRACE
496/* TODO: make this variable */
497#define FTRACE_GRAPH_MAX_FUNCS 32
498extern int ftrace_graph_filter_enabled;
499extern int ftrace_graph_count;
500extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
501
502static inline int ftrace_graph_addr(unsigned long addr)
503{
504    int i;
505
506    if (!ftrace_graph_filter_enabled)
507        return 1;
508
509    for (i = 0; i < ftrace_graph_count; i++) {
510        if (addr == ftrace_graph_funcs[i])
511            return 1;
512    }
513
514    return 0;
515}
516#else
517static inline int ftrace_graph_addr(unsigned long addr)
518{
519    return 1;
520}
521#endif /* CONFIG_DYNAMIC_FTRACE */
522#else /* CONFIG_FUNCTION_GRAPH_TRACER */
523static inline enum print_line_t
524print_graph_function_flags(struct trace_iterator *iter, u32 flags)
525{
526    return TRACE_TYPE_UNHANDLED;
527}
528#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
529
530extern struct list_head ftrace_pids;
531
532#ifdef CONFIG_FUNCTION_TRACER
533static inline int ftrace_trace_task(struct task_struct *task)
534{
535    if (list_empty(&ftrace_pids))
536        return 1;
537
538    return test_tsk_trace_trace(task);
539}
540#else
541static inline int ftrace_trace_task(struct task_struct *task)
542{
543    return 1;
544}
545#endif
546
547/*
548 * struct trace_parser - servers for reading the user input separated by spaces
549 * @cont: set if the input is not complete - no final space char was found
550 * @buffer: holds the parsed user input
551 * @idx: user input length
552 * @size: buffer size
553 */
554struct trace_parser {
555    bool cont;
556    char *buffer;
557    unsigned idx;
558    unsigned size;
559};
560
561static inline bool trace_parser_loaded(struct trace_parser *parser)
562{
563    return (parser->idx != 0);
564}
565
566static inline bool trace_parser_cont(struct trace_parser *parser)
567{
568    return parser->cont;
569}
570
571static inline void trace_parser_clear(struct trace_parser *parser)
572{
573    parser->cont = false;
574    parser->idx = 0;
575}
576
577extern int trace_parser_get_init(struct trace_parser *parser, int size);
578extern void trace_parser_put(struct trace_parser *parser);
579extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
580    size_t cnt, loff_t *ppos);
581
582/*
583 * trace_iterator_flags is an enumeration that defines bit
584 * positions into trace_flags that controls the output.
585 *
586 * NOTE: These bits must match the trace_options array in
587 * trace.c.
588 */
589enum trace_iterator_flags {
590    TRACE_ITER_PRINT_PARENT = 0x01,
591    TRACE_ITER_SYM_OFFSET = 0x02,
592    TRACE_ITER_SYM_ADDR = 0x04,
593    TRACE_ITER_VERBOSE = 0x08,
594    TRACE_ITER_RAW = 0x10,
595    TRACE_ITER_HEX = 0x20,
596    TRACE_ITER_BIN = 0x40,
597    TRACE_ITER_BLOCK = 0x80,
598    TRACE_ITER_STACKTRACE = 0x100,
599    TRACE_ITER_PRINTK = 0x200,
600    TRACE_ITER_PREEMPTONLY = 0x400,
601    TRACE_ITER_BRANCH = 0x800,
602    TRACE_ITER_ANNOTATE = 0x1000,
603    TRACE_ITER_USERSTACKTRACE = 0x2000,
604    TRACE_ITER_SYM_USEROBJ = 0x4000,
605    TRACE_ITER_PRINTK_MSGONLY = 0x8000,
606    TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
607    TRACE_ITER_LATENCY_FMT = 0x20000,
608    TRACE_ITER_SLEEP_TIME = 0x40000,
609    TRACE_ITER_GRAPH_TIME = 0x80000,
610    TRACE_ITER_RECORD_CMD = 0x100000,
611    TRACE_ITER_OVERWRITE = 0x200000,
612};
613
614/*
615 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
616 * control the output of kernel symbols.
617 */
618#define TRACE_ITER_SYM_MASK \
619    (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
620
621extern struct tracer nop_trace;
622
623#ifdef CONFIG_BRANCH_TRACER
624extern int enable_branch_tracing(struct trace_array *tr);
625extern void disable_branch_tracing(void);
626static inline int trace_branch_enable(struct trace_array *tr)
627{
628    if (trace_flags & TRACE_ITER_BRANCH)
629        return enable_branch_tracing(tr);
630    return 0;
631}
632static inline void trace_branch_disable(void)
633{
634    /* due to races, always disable */
635    disable_branch_tracing();
636}
637#else
638static inline int trace_branch_enable(struct trace_array *tr)
639{
640    return 0;
641}
642static inline void trace_branch_disable(void)
643{
644}
645#endif /* CONFIG_BRANCH_TRACER */
646
647/* set ring buffers to default size if not already done so */
648int tracing_update_buffers(void);
649
650/* trace event type bit fields, not numeric */
651enum {
652    TRACE_EVENT_TYPE_PRINTF = 1,
653    TRACE_EVENT_TYPE_RAW = 2,
654};
655
656struct ftrace_event_field {
657    struct list_head link;
658    char *name;
659    char *type;
660    int filter_type;
661    int offset;
662    int size;
663    int is_signed;
664};
665
666struct event_filter {
667    int n_preds; /* Number assigned */
668    int a_preds; /* allocated */
669    struct filter_pred *preds;
670    struct filter_pred *root;
671    char *filter_string;
672};
673
674struct event_subsystem {
675    struct list_head list;
676    const char *name;
677    struct dentry *entry;
678    struct event_filter *filter;
679    int nr_events;
680};
681
682#define FILTER_PRED_INVALID ((unsigned short)-1)
683#define FILTER_PRED_IS_RIGHT (1 << 15)
684#define FILTER_PRED_FOLD (1 << 15)
685
686/*
687 * The max preds is the size of unsigned short with
688 * two flags at the MSBs. One bit is used for both the IS_RIGHT
689 * and FOLD flags. The other is reserved.
690 *
691 * 2^14 preds is way more than enough.
692 */
693#define MAX_FILTER_PRED 16384
694
695struct filter_pred;
696struct regex;
697
698typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
699
700typedef int (*regex_match_func)(char *str, struct regex *r, int len);
701
702enum regex_type {
703    MATCH_FULL = 0,
704    MATCH_FRONT_ONLY,
705    MATCH_MIDDLE_ONLY,
706    MATCH_END_ONLY,
707};
708
709struct regex {
710    char pattern[MAX_FILTER_STR_VAL];
711    int len;
712    int field_len;
713    regex_match_func match;
714};
715
716struct filter_pred {
717    filter_pred_fn_t fn;
718    u64 val;
719    struct regex regex;
720    /*
721     * Leaf nodes use field_name, ops is used by AND and OR
722     * nodes. The field_name is always freed when freeing a pred.
723     * We can overload field_name for ops and have it freed
724     * as well.
725     */
726    union {
727        char *field_name;
728        unsigned short *ops;
729    };
730    int offset;
731    int not;
732    int op;
733    unsigned short index;
734    unsigned short parent;
735    unsigned short left;
736    unsigned short right;
737};
738
739extern struct list_head ftrace_common_fields;
740
741extern enum regex_type
742filter_parse_regex(char *buff, int len, char **search, int *not);
743extern void print_event_filter(struct ftrace_event_call *call,
744                   struct trace_seq *s);
745extern int apply_event_filter(struct ftrace_event_call *call,
746                  char *filter_string);
747extern int apply_subsystem_event_filter(struct event_subsystem *system,
748                    char *filter_string);
749extern void print_subsystem_event_filter(struct event_subsystem *system,
750                     struct trace_seq *s);
751extern int filter_assign_type(const char *type);
752
753struct list_head *
754trace_get_fields(struct ftrace_event_call *event_call);
755
756static inline int
757filter_check_discard(struct ftrace_event_call *call, void *rec,
758             struct ring_buffer *buffer,
759             struct ring_buffer_event *event)
760{
761    if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
762        !filter_match_preds(call->filter, rec)) {
763        ring_buffer_discard_commit(buffer, event);
764        return 1;
765    }
766
767    return 0;
768}
769
770extern void trace_event_enable_cmd_record(bool enable);
771
772extern struct mutex event_mutex;
773extern struct list_head ftrace_events;
774
775extern const char *__start___trace_bprintk_fmt[];
776extern const char *__stop___trace_bprintk_fmt[];
777
778#undef FTRACE_ENTRY
779#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
780    extern struct ftrace_event_call \
781    __attribute__((__aligned__(4))) event_##call;
782#undef FTRACE_ENTRY_DUP
783#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
784    FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
785#include "trace_entries.h"
786
787/* Only current can touch trace_recursion */
788#define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
789#define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
790
791/* Ring buffer has the 10 LSB bits to count */
792#define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
793
794/* for function tracing recursion */
795#define TRACE_INTERNAL_BIT (1<<11)
796#define TRACE_GLOBAL_BIT (1<<12)
797
798#define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
799#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
800#define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
801
802#endif /* _LINUX_KERNEL_TRACE_H */
803

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