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7c6a1c65 PZ |
1 | #include <sys/types.h> |
2 | #include <unistd.h> | |
3 | #include <stdio.h> | |
4 | #include <stdlib.h> | |
5 | ||
6 | #include "util.h" | |
7 | #include "header.h" | |
8 | ||
9 | /* | |
10 | * | |
11 | */ | |
12 | ||
13 | struct perf_header_attr *perf_header_attr__new(struct perf_counter_attr *attr) | |
14 | { | |
15 | struct perf_header_attr *self = malloc(sizeof(*self)); | |
16 | ||
17 | if (!self) | |
18 | die("nomem"); | |
19 | ||
20 | self->attr = *attr; | |
21 | self->ids = 0; | |
22 | self->size = 1; | |
23 | self->id = malloc(sizeof(u64)); | |
24 | ||
25 | if (!self->id) | |
26 | die("nomem"); | |
27 | ||
28 | return self; | |
29 | } | |
30 | ||
31 | void perf_header_attr__add_id(struct perf_header_attr *self, u64 id) | |
32 | { | |
33 | int pos = self->ids; | |
34 | ||
35 | self->ids++; | |
36 | if (self->ids > self->size) { | |
37 | self->size *= 2; | |
38 | self->id = realloc(self->id, self->size * sizeof(u64)); | |
39 | if (!self->id) | |
40 | die("nomem"); | |
41 | } | |
42 | self->id[pos] = id; | |
43 | } | |
44 | ||
45 | /* | |
46 | * | |
47 | */ | |
48 | ||
49 | struct perf_header *perf_header__new(void) | |
50 | { | |
51 | struct perf_header *self = malloc(sizeof(*self)); | |
52 | ||
53 | if (!self) | |
54 | die("nomem"); | |
55 | ||
56 | self->frozen = 0; | |
57 | ||
58 | self->attrs = 0; | |
59 | self->size = 1; | |
60 | self->attr = malloc(sizeof(void *)); | |
61 | ||
62 | if (!self->attr) | |
63 | die("nomem"); | |
64 | ||
65 | self->data_offset = 0; | |
66 | self->data_size = 0; | |
67 | ||
68 | return self; | |
69 | } | |
70 | ||
71 | void perf_header__add_attr(struct perf_header *self, | |
72 | struct perf_header_attr *attr) | |
73 | { | |
74 | int pos = self->attrs; | |
75 | ||
76 | if (self->frozen) | |
77 | die("frozen"); | |
78 | ||
79 | self->attrs++; | |
80 | if (self->attrs > self->size) { | |
81 | self->size *= 2; | |
82 | self->attr = realloc(self->attr, self->size * sizeof(void *)); | |
83 | if (!self->attr) | |
84 | die("nomem"); | |
85 | } | |
86 | self->attr[pos] = attr; | |
87 | } | |
88 | ||
8755a8f2 AV |
89 | struct perf_trace_event_type { |
90 | u64 event_id; | |
91 | char name[64]; | |
92 | }; | |
93 | ||
94 | static int event_count; | |
95 | static struct perf_trace_event_type *events; | |
96 | ||
97 | void perf_header__push_event(u64 id, const char *name) | |
98 | { | |
99 | if (strlen(name) > 64) | |
100 | printf("Event %s will be truncated\n", name); | |
101 | ||
102 | if (!events) { | |
103 | events = malloc(sizeof(struct perf_trace_event_type)); | |
104 | if (!events) | |
105 | die("nomem"); | |
106 | } else { | |
107 | events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type)); | |
108 | if (!events) | |
109 | die("nomem"); | |
110 | } | |
111 | memset(&events[event_count], 0, sizeof(struct perf_trace_event_type)); | |
112 | events[event_count].event_id = id; | |
113 | strncpy(events[event_count].name, name, 63); | |
114 | event_count++; | |
115 | } | |
116 | ||
117 | char *perf_header__find_event(u64 id) | |
118 | { | |
119 | int i; | |
120 | for (i = 0 ; i < event_count; i++) { | |
121 | if (events[i].event_id == id) | |
122 | return events[i].name; | |
123 | } | |
124 | return NULL; | |
125 | } | |
126 | ||
7c6a1c65 PZ |
127 | static const char *__perf_magic = "PERFFILE"; |
128 | ||
129 | #define PERF_MAGIC (*(u64 *)__perf_magic) | |
130 | ||
131 | struct perf_file_section { | |
132 | u64 offset; | |
133 | u64 size; | |
134 | }; | |
135 | ||
136 | struct perf_file_attr { | |
137 | struct perf_counter_attr attr; | |
138 | struct perf_file_section ids; | |
139 | }; | |
140 | ||
141 | struct perf_file_header { | |
142 | u64 magic; | |
143 | u64 size; | |
144 | u64 attr_size; | |
145 | struct perf_file_section attrs; | |
146 | struct perf_file_section data; | |
8755a8f2 | 147 | struct perf_file_section event_types; |
7c6a1c65 PZ |
148 | }; |
149 | ||
150 | static void do_write(int fd, void *buf, size_t size) | |
151 | { | |
152 | while (size) { | |
153 | int ret = write(fd, buf, size); | |
154 | ||
155 | if (ret < 0) | |
156 | die("failed to write"); | |
157 | ||
158 | size -= ret; | |
159 | buf += ret; | |
160 | } | |
161 | } | |
162 | ||
163 | void perf_header__write(struct perf_header *self, int fd) | |
164 | { | |
165 | struct perf_file_header f_header; | |
166 | struct perf_file_attr f_attr; | |
167 | struct perf_header_attr *attr; | |
168 | int i; | |
169 | ||
170 | lseek(fd, sizeof(f_header), SEEK_SET); | |
171 | ||
172 | ||
173 | for (i = 0; i < self->attrs; i++) { | |
174 | attr = self->attr[i]; | |
175 | ||
176 | attr->id_offset = lseek(fd, 0, SEEK_CUR); | |
177 | do_write(fd, attr->id, attr->ids * sizeof(u64)); | |
178 | } | |
179 | ||
180 | ||
181 | self->attr_offset = lseek(fd, 0, SEEK_CUR); | |
182 | ||
183 | for (i = 0; i < self->attrs; i++) { | |
184 | attr = self->attr[i]; | |
185 | ||
186 | f_attr = (struct perf_file_attr){ | |
187 | .attr = attr->attr, | |
188 | .ids = { | |
189 | .offset = attr->id_offset, | |
190 | .size = attr->ids * sizeof(u64), | |
191 | } | |
192 | }; | |
193 | do_write(fd, &f_attr, sizeof(f_attr)); | |
194 | } | |
195 | ||
8755a8f2 AV |
196 | self->event_offset = lseek(fd, 0, SEEK_CUR); |
197 | self->event_size = event_count * sizeof(struct perf_trace_event_type); | |
198 | if (events) | |
199 | do_write(fd, events, self->event_size); | |
200 | ||
7c6a1c65 PZ |
201 | |
202 | self->data_offset = lseek(fd, 0, SEEK_CUR); | |
203 | ||
204 | f_header = (struct perf_file_header){ | |
205 | .magic = PERF_MAGIC, | |
206 | .size = sizeof(f_header), | |
207 | .attr_size = sizeof(f_attr), | |
208 | .attrs = { | |
209 | .offset = self->attr_offset, | |
210 | .size = self->attrs * sizeof(f_attr), | |
211 | }, | |
212 | .data = { | |
213 | .offset = self->data_offset, | |
214 | .size = self->data_size, | |
215 | }, | |
8755a8f2 AV |
216 | .event_types = { |
217 | .offset = self->event_offset, | |
218 | .size = self->event_size, | |
219 | }, | |
7c6a1c65 PZ |
220 | }; |
221 | ||
222 | lseek(fd, 0, SEEK_SET); | |
223 | do_write(fd, &f_header, sizeof(f_header)); | |
224 | lseek(fd, self->data_offset + self->data_size, SEEK_SET); | |
225 | ||
226 | self->frozen = 1; | |
227 | } | |
228 | ||
229 | static void do_read(int fd, void *buf, size_t size) | |
230 | { | |
231 | while (size) { | |
232 | int ret = read(fd, buf, size); | |
233 | ||
234 | if (ret < 0) | |
235 | die("failed to read"); | |
7eac7e9e PH |
236 | if (ret == 0) |
237 | die("failed to read: missing data"); | |
7c6a1c65 PZ |
238 | |
239 | size -= ret; | |
240 | buf += ret; | |
241 | } | |
242 | } | |
243 | ||
244 | struct perf_header *perf_header__read(int fd) | |
245 | { | |
246 | struct perf_header *self = perf_header__new(); | |
247 | struct perf_file_header f_header; | |
248 | struct perf_file_attr f_attr; | |
249 | u64 f_id; | |
250 | ||
251 | int nr_attrs, nr_ids, i, j; | |
252 | ||
253 | lseek(fd, 0, SEEK_SET); | |
254 | do_read(fd, &f_header, sizeof(f_header)); | |
255 | ||
256 | if (f_header.magic != PERF_MAGIC || | |
257 | f_header.size != sizeof(f_header) || | |
258 | f_header.attr_size != sizeof(f_attr)) | |
259 | die("incompatible file format"); | |
260 | ||
261 | nr_attrs = f_header.attrs.size / sizeof(f_attr); | |
262 | lseek(fd, f_header.attrs.offset, SEEK_SET); | |
263 | ||
264 | for (i = 0; i < nr_attrs; i++) { | |
265 | struct perf_header_attr *attr; | |
1c222bce | 266 | off_t tmp; |
7c6a1c65 PZ |
267 | |
268 | do_read(fd, &f_attr, sizeof(f_attr)); | |
1c222bce | 269 | tmp = lseek(fd, 0, SEEK_CUR); |
7c6a1c65 PZ |
270 | |
271 | attr = perf_header_attr__new(&f_attr.attr); | |
272 | ||
273 | nr_ids = f_attr.ids.size / sizeof(u64); | |
274 | lseek(fd, f_attr.ids.offset, SEEK_SET); | |
275 | ||
276 | for (j = 0; j < nr_ids; j++) { | |
277 | do_read(fd, &f_id, sizeof(f_id)); | |
278 | ||
279 | perf_header_attr__add_id(attr, f_id); | |
280 | } | |
281 | perf_header__add_attr(self, attr); | |
282 | lseek(fd, tmp, SEEK_SET); | |
283 | } | |
284 | ||
8755a8f2 AV |
285 | if (f_header.event_types.size) { |
286 | lseek(fd, f_header.event_types.offset, SEEK_SET); | |
287 | events = malloc(f_header.event_types.size); | |
288 | if (!events) | |
289 | die("nomem"); | |
290 | do_read(fd, events, f_header.event_types.size); | |
291 | event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type); | |
292 | } | |
293 | self->event_offset = f_header.event_types.offset; | |
294 | self->event_size = f_header.event_types.size; | |
295 | ||
7c6a1c65 PZ |
296 | self->data_offset = f_header.data.offset; |
297 | self->data_size = f_header.data.size; | |
298 | ||
2e01d179 | 299 | lseek(fd, self->data_offset, SEEK_SET); |
7c6a1c65 PZ |
300 | |
301 | self->frozen = 1; | |
302 | ||
303 | return self; | |
304 | } | |
0d3a5c88 FW |
305 | |
306 | u64 perf_header__sample_type(struct perf_header *header) | |
307 | { | |
308 | u64 type = 0; | |
309 | int i; | |
310 | ||
311 | for (i = 0; i < header->attrs; i++) { | |
312 | struct perf_header_attr *attr = header->attr[i]; | |
313 | ||
314 | if (!type) | |
315 | type = attr->attr.sample_type; | |
316 | else if (type != attr->attr.sample_type) | |
317 | die("non matching sample_type"); | |
318 | } | |
319 | ||
320 | return type; | |
321 | } | |
322 | ||
323 | struct perf_counter_attr * | |
324 | perf_header__find_attr(u64 id, struct perf_header *header) | |
325 | { | |
326 | int i; | |
327 | ||
328 | for (i = 0; i < header->attrs; i++) { | |
329 | struct perf_header_attr *attr = header->attr[i]; | |
330 | int j; | |
331 | ||
332 | for (j = 0; j < attr->ids; j++) { | |
333 | if (attr->id[j] == id) | |
334 | return &attr->attr; | |
335 | } | |
336 | } | |
337 | ||
338 | return NULL; | |
339 | } |