trace_output.c (f01387d2693813eb5271a3448e6a082322c7d75d) trace_output.c (12306276fabcb746a14979e96f43a13c724dec49)
1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>

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15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>

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15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24{
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38}
39
40enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bputs_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);

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80
81 ret = trace_seq_puts(s, field->buf);
82 if (!ret)
83 return TRACE_TYPE_PARTIAL_LINE;
84
85 return TRACE_TYPE_HANDLED;
86}
87
23enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24{
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28 int ret;
29
30 trace_assign_type(field, entry);

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63
64 ret = trace_seq_puts(s, field->buf);
65 if (!ret)
66 return TRACE_TYPE_PARTIAL_LINE;
67
68 return TRACE_TYPE_HANDLED;
69}
70
88/**
89 * trace_seq_printf - sequence printing of trace information
90 * @s: trace sequence descriptor
91 * @fmt: printf format string
92 *
93 * It returns 0 if the trace oversizes the buffer's free
94 * space, 1 otherwise.
95 *
96 * The tracer may use either sequence operations or its own
97 * copy to user routines. To simplify formating of a trace
98 * trace_seq_printf is used to store strings into a special
99 * buffer (@s). Then the output may be either used by
100 * the sequencer or pulled into another buffer.
101 */
102int
103trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
104{
105 int len = (PAGE_SIZE - 1) - s->len;
106 va_list ap;
107 int ret;
108
109 if (s->full || !len)
110 return 0;
111
112 va_start(ap, fmt);
113 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
114 va_end(ap);
115
116 /* If we can't write it all, don't bother writing anything */
117 if (ret >= len) {
118 s->full = 1;
119 return 0;
120 }
121
122 s->len += ret;
123
124 return 1;
125}
126EXPORT_SYMBOL_GPL(trace_seq_printf);
127
128/**
129 * trace_seq_vprintf - sequence printing of trace information
130 * @s: trace sequence descriptor
131 * @fmt: printf format string
132 *
133 * The tracer may use either sequence operations or its own
134 * copy to user routines. To simplify formating of a trace
135 * trace_seq_printf is used to store strings into a special
136 * buffer (@s). Then the output may be either used by
137 * the sequencer or pulled into another buffer.
138 */
139int
140trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
141{
142 int len = (PAGE_SIZE - 1) - s->len;
143 int ret;
144
145 if (s->full || !len)
146 return 0;
147
148 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
149
150 /* If we can't write it all, don't bother writing anything */
151 if (ret >= len) {
152 s->full = 1;
153 return 0;
154 }
155
156 s->len += ret;
157
158 return len;
159}
160EXPORT_SYMBOL_GPL(trace_seq_vprintf);
161
162int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
163{
164 int len = (PAGE_SIZE - 1) - s->len;
165 int ret;
166
167 if (s->full || !len)
168 return 0;
169
170 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
171
172 /* If we can't write it all, don't bother writing anything */
173 if (ret >= len) {
174 s->full = 1;
175 return 0;
176 }
177
178 s->len += ret;
179
180 return len;
181}
182
183/**
184 * trace_seq_puts - trace sequence printing of simple string
185 * @s: trace sequence descriptor
186 * @str: simple string to record
187 *
188 * The tracer may use either the sequence operations or its own
189 * copy to user routines. This function records a simple string
190 * into a special buffer (@s) for later retrieval by a sequencer
191 * or other mechanism.
192 */
193int trace_seq_puts(struct trace_seq *s, const char *str)
194{
195 int len = strlen(str);
196
197 if (s->full)
198 return 0;
199
200 if (len > ((PAGE_SIZE - 1) - s->len)) {
201 s->full = 1;
202 return 0;
203 }
204
205 memcpy(s->buffer + s->len, str, len);
206 s->len += len;
207
208 return len;
209}
210
211int trace_seq_putc(struct trace_seq *s, unsigned char c)
212{
213 if (s->full)
214 return 0;
215
216 if (s->len >= (PAGE_SIZE - 1)) {
217 s->full = 1;
218 return 0;
219 }
220
221 s->buffer[s->len++] = c;
222
223 return 1;
224}
225EXPORT_SYMBOL(trace_seq_putc);
226
227int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
228{
229 if (s->full)
230 return 0;
231
232 if (len > ((PAGE_SIZE - 1) - s->len)) {
233 s->full = 1;
234 return 0;
235 }
236
237 memcpy(s->buffer + s->len, mem, len);
238 s->len += len;
239
240 return len;
241}
242
243int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
244{
245 unsigned char hex[HEX_CHARS];
246 const unsigned char *data = mem;
247 int i, j;
248
249 if (s->full)
250 return 0;
251
252#ifdef __BIG_ENDIAN
253 for (i = 0, j = 0; i < len; i++) {
254#else
255 for (i = len-1, j = 0; i >= 0; i--) {
256#endif
257 hex[j++] = hex_asc_hi(data[i]);
258 hex[j++] = hex_asc_lo(data[i]);
259 }
260 hex[j++] = ' ';
261
262 return trace_seq_putmem(s, hex, j);
263}
264
265void *trace_seq_reserve(struct trace_seq *s, size_t len)
266{
267 void *ret;
268
269 if (s->full)
270 return NULL;
271
272 if (len > ((PAGE_SIZE - 1) - s->len)) {
273 s->full = 1;
274 return NULL;
275 }
276
277 ret = s->buffer + s->len;
278 s->len += len;
279
280 return ret;
281}
282
283int trace_seq_path(struct trace_seq *s, const struct path *path)
284{
285 unsigned char *p;
286
287 if (s->full)
288 return 0;
289
290 if (s->len >= (PAGE_SIZE - 1)) {
291 s->full = 1;
292 return 0;
293 }
294
295 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
296 if (!IS_ERR(p)) {
297 p = mangle_path(s->buffer + s->len, p, "\n");
298 if (p) {
299 s->len = p - s->buffer;
300 return 1;
301 }
302 } else {
303 s->buffer[s->len++] = '?';
304 return 1;
305 }
306
307 s->full = 1;
308 return 0;
309}
310
311const char *
312ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
313 unsigned long flags,
314 const struct trace_print_flags *flag_array)
315{
316 unsigned long mask;
317 const char *str;
318 const char *ret = p->buffer + p->len;

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394 trace_seq_putc(p, 0);
395
396 return ret;
397}
398EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
399#endif
400
401const char *
71const char *
72ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
73 unsigned long flags,
74 const struct trace_print_flags *flag_array)
75{
76 unsigned long mask;
77 const char *str;
78 const char *ret = p->buffer + p->len;

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154 trace_seq_putc(p, 0);
155
156 return ret;
157}
158EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
159#endif
160
161const char *
162ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
163 unsigned int bitmask_size)
164{
165 const char *ret = p->buffer + p->len;
166
167 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
168 trace_seq_putc(p, 0);
169
170 return ret;
171}
172EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
173
174const char *
402ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
403{
404 int i;
405 const char *ret = p->buffer + p->len;
406
407 for (i = 0; i < buf_len; i++)
408 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
409

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176{
177 int i;
178 const char *ret = p->buffer + p->len;
179
180 for (i = 0; i < buf_len; i++)
181 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
182

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