sched/core: Fix a race between try_to_wake_up() and a woken up task
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / trace / trace_probe.h
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1/*
2 * Common header file for probe-based Dynamic events.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 * This code was copied from kernel/trace/trace_kprobe.h written by
18 * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
19 *
20 * Updates to make this generic:
21 * Copyright (C) IBM Corporation, 2010-2011
22 * Author: Srikar Dronamraju
23 */
24
25#include <linux/seq_file.h>
26#include <linux/slab.h>
27#include <linux/smp.h>
28#include <linux/debugfs.h>
29#include <linux/types.h>
30#include <linux/string.h>
31#include <linux/ctype.h>
32#include <linux/ptrace.h>
33#include <linux/perf_event.h>
34#include <linux/kprobes.h>
35#include <linux/stringify.h>
36#include <linux/limits.h>
37#include <linux/uaccess.h>
38#include <asm/bitsperlong.h>
39
40#include "trace.h"
41#include "trace_output.h"
42
43#define MAX_TRACE_ARGS 128
44#define MAX_ARGSTR_LEN 63
45#define MAX_EVENT_NAME_LEN 64
46#define MAX_STRING_SIZE PATH_MAX
47
48/* Reserved field names */
49#define FIELD_STRING_IP "__probe_ip"
50#define FIELD_STRING_RETIP "__probe_ret_ip"
51#define FIELD_STRING_FUNC "__probe_func"
52
53#undef DEFINE_FIELD
54#define DEFINE_FIELD(type, item, name, is_signed) \
55 do { \
56 ret = trace_define_field(event_call, #type, name, \
57 offsetof(typeof(field), item), \
58 sizeof(field.item), is_signed, \
59 FILTER_OTHER); \
60 if (ret) \
61 return ret; \
62 } while (0)
63
64
65/* Flags for trace_probe */
66#define TP_FLAG_TRACE 1
67#define TP_FLAG_PROFILE 2
68#define TP_FLAG_REGISTERED 4
69
70
71/* data_rloc: data relative location, compatible with u32 */
72#define make_data_rloc(len, roffs) \
73 (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
74#define get_rloc_len(dl) ((u32)(dl) >> 16)
75#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
76
77/*
78 * Convert data_rloc to data_loc:
79 * data_rloc stores the offset from data_rloc itself, but data_loc
80 * stores the offset from event entry.
81 */
82#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
83
84/* Data fetch function type */
85typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
86/* Printing function type */
87typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, void *);
88
89/* Fetch types */
90enum {
91 FETCH_MTD_reg = 0,
92 FETCH_MTD_stack,
93 FETCH_MTD_retval,
94 FETCH_MTD_memory,
95 FETCH_MTD_symbol,
96 FETCH_MTD_deref,
97 FETCH_MTD_bitfield,
98 FETCH_MTD_END,
99};
100
101/* Fetch type information table */
102struct fetch_type {
103 const char *name; /* Name of type */
104 size_t size; /* Byte size of type */
105 int is_signed; /* Signed flag */
106 print_type_func_t print; /* Print functions */
107 const char *fmt; /* Fromat string */
108 const char *fmttype; /* Name in format file */
109 /* Fetch functions */
110 fetch_func_t fetch[FETCH_MTD_END];
111};
112
113struct fetch_param {
114 fetch_func_t fn;
115 void *data;
116};
117
118struct probe_arg {
119 struct fetch_param fetch;
120 struct fetch_param fetch_size;
121 unsigned int offset; /* Offset from argument entry */
122 const char *name; /* Name of this argument */
123 const char *comm; /* Command of this argument */
124 const struct fetch_type *type; /* Type of this argument */
125};
126
127static inline __kprobes void call_fetch(struct fetch_param *fprm,
128 struct pt_regs *regs, void *dest)
129{
130 return fprm->fn(regs, fprm->data, dest);
131}
132
133/* Check the name is good for event/group/fields */
134static inline int is_good_name(const char *name)
135{
136 if (!isalpha(*name) && *name != '_')
137 return 0;
138 while (*++name != '\0') {
139 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
140 return 0;
141 }
142 return 1;
143}
144
145extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
f3f096cf 146 struct probe_arg *parg, bool is_return, bool is_kprobe);
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147
148extern int traceprobe_conflict_field_name(const char *name,
149 struct probe_arg *args, int narg);
150
151extern void traceprobe_update_arg(struct probe_arg *arg);
152extern void traceprobe_free_probe_arg(struct probe_arg *arg);
153
154extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset);
155
156extern ssize_t traceprobe_probes_write(struct file *file,
157 const char __user *buffer, size_t count, loff_t *ppos,
158 int (*createfn)(int, char**));
159
160extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));