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1
2#include <linux/list.h>
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <unistd.h>
6#include <stdio.h>
7#include <dirent.h>
8#include "sysfs.h"
9#include "util.h"
10#include "pmu.h"
11#include "parse-events.h"
12
13int perf_pmu_parse(struct list_head *list, char *name);
14extern FILE *perf_pmu_in;
15
16static LIST_HEAD(pmus);
17
18/*
19 * Parse & process all the sysfs attributes located under
20 * the directory specified in 'dir' parameter.
21 */
22static int pmu_format_parse(char *dir, struct list_head *head)
23{
24 struct dirent *evt_ent;
25 DIR *format_dir;
26 int ret = 0;
27
28 format_dir = opendir(dir);
29 if (!format_dir)
30 return -EINVAL;
31
32 while (!ret && (evt_ent = readdir(format_dir))) {
33 char path[PATH_MAX];
34 char *name = evt_ent->d_name;
35 FILE *file;
36
37 if (!strcmp(name, ".") || !strcmp(name, ".."))
38 continue;
39
40 snprintf(path, PATH_MAX, "%s/%s", dir, name);
41
42 ret = -EINVAL;
43 file = fopen(path, "r");
44 if (!file)
45 break;
46
47 perf_pmu_in = file;
48 ret = perf_pmu_parse(head, name);
49 fclose(file);
50 }
51
52 closedir(format_dir);
53 return ret;
54}
55
56/*
57 * Reading/parsing the default pmu format definition, which should be
58 * located at:
59 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
60 */
61static int pmu_format(char *name, struct list_head *format)
62{
63 struct stat st;
64 char path[PATH_MAX];
65 const char *sysfs;
66
67 sysfs = sysfs_find_mountpoint();
68 if (!sysfs)
69 return -1;
70
71 snprintf(path, PATH_MAX,
72 "%s/bus/event_source/devices/%s/format", sysfs, name);
73
74 if (stat(path, &st) < 0)
75 return -1;
76
77 if (pmu_format_parse(path, format))
78 return -1;
79
80 return 0;
81}
82
83/*
84 * Reading/parsing the default pmu type value, which should be
85 * located at:
86 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
87 */
88static int pmu_type(char *name, __u32 *type)
89{
90 struct stat st;
91 char path[PATH_MAX];
92 const char *sysfs;
93 FILE *file;
94 int ret = 0;
95
96 sysfs = sysfs_find_mountpoint();
97 if (!sysfs)
98 return -1;
99
100 snprintf(path, PATH_MAX,
101 "%s/bus/event_source/devices/%s/type", sysfs, name);
102
103 if (stat(path, &st) < 0)
104 return -1;
105
106 file = fopen(path, "r");
107 if (!file)
108 return -EINVAL;
109
110 if (1 != fscanf(file, "%u", type))
111 ret = -1;
112
113 fclose(file);
114 return ret;
115}
116
117static struct perf_pmu *pmu_lookup(char *name)
118{
119 struct perf_pmu *pmu;
120 LIST_HEAD(format);
121 __u32 type;
122
123 /*
124 * The pmu data we store & need consists of the pmu
125 * type value and format definitions. Load both right
126 * now.
127 */
128 if (pmu_format(name, &format))
129 return NULL;
130
131 if (pmu_type(name, &type))
132 return NULL;
133
134 pmu = zalloc(sizeof(*pmu));
135 if (!pmu)
136 return NULL;
137
138 INIT_LIST_HEAD(&pmu->format);
139 list_splice(&format, &pmu->format);
140 pmu->name = strdup(name);
141 pmu->type = type;
142 return pmu;
143}
144
145static struct perf_pmu *pmu_find(char *name)
146{
147 struct perf_pmu *pmu;
148
149 list_for_each_entry(pmu, &pmus, list)
150 if (!strcmp(pmu->name, name))
151 return pmu;
152
153 return NULL;
154}
155
156struct perf_pmu *perf_pmu__find(char *name)
157{
158 struct perf_pmu *pmu;
159
160 /*
161 * Once PMU is loaded it stays in the list,
162 * so we keep us from multiple reading/parsing
163 * the pmu format definitions.
164 */
165 pmu = pmu_find(name);
166 if (pmu)
167 return pmu;
168
169 return pmu_lookup(name);
170}
171
172static struct perf_pmu__format*
173pmu_find_format(struct list_head *formats, char *name)
174{
175 struct perf_pmu__format *format;
176
177 list_for_each_entry(format, formats, list)
178 if (!strcmp(format->name, name))
179 return format;
180
181 return NULL;
182}
183
184/*
185 * Returns value based on the format definition (format parameter)
186 * and unformated value (value parameter).
187 *
188 * TODO maybe optimize a little ;)
189 */
190static __u64 pmu_format_value(unsigned long *format, __u64 value)
191{
192 unsigned long fbit, vbit;
193 __u64 v = 0;
194
195 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
196
197 if (!test_bit(fbit, format))
198 continue;
199
200 if (!(value & (1llu << vbit++)))
201 continue;
202
203 v |= (1llu << fbit);
204 }
205
206 return v;
207}
208
209/*
210 * Setup one of config[12] attr members based on the
211 * user input data - temr parameter.
212 */
213static int pmu_config_term(struct list_head *formats,
214 struct perf_event_attr *attr,
215 struct parse_events__term *term)
216{
217 struct perf_pmu__format *format;
218 __u64 *vp;
219
220 /*
221 * Support only for hardcoded and numnerial terms.
222 * Hardcoded terms should be already in, so nothing
223 * to be done for them.
224 */
225 if (parse_events__is_hardcoded_term(term))
226 return 0;
227
228 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
229 return -EINVAL;
230
231 format = pmu_find_format(formats, term->config);
232 if (!format)
233 return -EINVAL;
234
235 switch (format->value) {
236 case PERF_PMU_FORMAT_VALUE_CONFIG:
237 vp = &attr->config;
238 break;
239 case PERF_PMU_FORMAT_VALUE_CONFIG1:
240 vp = &attr->config1;
241 break;
242 case PERF_PMU_FORMAT_VALUE_CONFIG2:
243 vp = &attr->config2;
244 break;
245 default:
246 return -EINVAL;
247 }
248
249 /*
250 * XXX If we ever decide to go with string values for
251 * non-hardcoded terms, here's the place to translate
252 * them into value.
253 */
254 *vp |= pmu_format_value(format->bits, term->val.num);
255 return 0;
256}
257
258static int pmu_config(struct list_head *formats, struct perf_event_attr *attr,
259 struct list_head *head_terms)
260{
261 struct parse_events__term *term;
262
263 list_for_each_entry(term, head_terms, list)
264 if (pmu_config_term(formats, attr, term))
265 return -EINVAL;
266
267 return 0;
268}
269
270/*
271 * Configures event's 'attr' parameter based on the:
272 * 1) users input - specified in terms parameter
273 * 2) pmu format definitions - specified by pmu parameter
274 */
275int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
276 struct list_head *head_terms)
277{
278 attr->type = pmu->type;
279 return pmu_config(&pmu->format, attr, head_terms);
280}
281
282int perf_pmu__new_format(struct list_head *list, char *name,
283 int config, unsigned long *bits)
284{
285 struct perf_pmu__format *format;
286
287 format = zalloc(sizeof(*format));
288 if (!format)
289 return -ENOMEM;
290
291 format->name = strdup(name);
292 format->value = config;
293 memcpy(format->bits, bits, sizeof(format->bits));
294
295 list_add_tail(&format->list, list);
296 return 0;
297}
298
299void perf_pmu__set_format(unsigned long *bits, long from, long to)
300{
301 long b;
302
303 if (!to)
304 to = from;
305
306 memset(bits, 0, BITS_TO_LONGS(PERF_PMU_FORMAT_BITS));
307 for (b = from; b <= to; b++)
308 set_bit(b, bits);
309}
310
311/* Simulated format definitions. */
312static struct test_format {
313 const char *name;
314 const char *value;
315} test_formats[] = {
316 { "krava01", "config:0-1,62-63\n", },
317 { "krava02", "config:10-17\n", },
318 { "krava03", "config:5\n", },
319 { "krava11", "config1:0,2,4,6,8,20-28\n", },
320 { "krava12", "config1:63\n", },
321 { "krava13", "config1:45-47\n", },
322 { "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
323 { "krava22", "config2:8,18,48,58\n", },
324 { "krava23", "config2:28-29,38\n", },
325};
326
327#define TEST_FORMATS_CNT (sizeof(test_formats) / sizeof(struct test_format))
328
329/* Simulated users input. */
330static struct parse_events__term test_terms[] = {
331 {
332 .config = (char *) "krava01",
333 .val.num = 15,
334 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
335 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
336 },
337 {
338 .config = (char *) "krava02",
339 .val.num = 170,
340 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
341 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
342 },
343 {
344 .config = (char *) "krava03",
345 .val.num = 1,
346 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
347 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
348 },
349 {
350 .config = (char *) "krava11",
351 .val.num = 27,
352 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
353 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
354 },
355 {
356 .config = (char *) "krava12",
357 .val.num = 1,
358 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
359 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
360 },
361 {
362 .config = (char *) "krava13",
363 .val.num = 2,
364 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
365 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
366 },
367 {
368 .config = (char *) "krava21",
369 .val.num = 119,
370 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
371 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
372 },
373 {
374 .config = (char *) "krava22",
375 .val.num = 11,
376 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
377 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
378 },
379 {
380 .config = (char *) "krava23",
381 .val.num = 2,
382 .type_val = PARSE_EVENTS__TERM_TYPE_NUM,
383 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
384 },
385};
386#define TERMS_CNT (sizeof(test_terms) / sizeof(struct parse_events__term))
387
388/*
389 * Prepare format directory data, exported by kernel
390 * at /sys/bus/event_source/devices/<dev>/format.
391 */
392static char *test_format_dir_get(void)
393{
394 static char dir[PATH_MAX];
395 unsigned int i;
396
397 snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
398 if (!mkdtemp(dir))
399 return NULL;
400
401 for (i = 0; i < TEST_FORMATS_CNT; i++) {
402 static char name[PATH_MAX];
403 struct test_format *format = &test_formats[i];
404 FILE *file;
405
406 snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
407
408 file = fopen(name, "w");
409 if (!file)
410 return NULL;
411
412 if (1 != fwrite(format->value, strlen(format->value), 1, file))
413 break;
414
415 fclose(file);
416 }
417
418 return dir;
419}
420
421/* Cleanup format directory. */
422static int test_format_dir_put(char *dir)
423{
424 char buf[PATH_MAX];
425 snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
426 if (system(buf))
427 return -1;
428
429 snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
430 return system(buf);
431}
432
433static struct list_head *test_terms_list(void)
434{
435 static LIST_HEAD(terms);
436 unsigned int i;
437
438 for (i = 0; i < TERMS_CNT; i++)
439 list_add_tail(&test_terms[i].list, &terms);
440
441 return &terms;
442}
443
444#undef TERMS_CNT
445
446int perf_pmu__test(void)
447{
448 char *format = test_format_dir_get();
449 LIST_HEAD(formats);
450 struct list_head *terms = test_terms_list();
451 int ret;
452
453 if (!format)
454 return -EINVAL;
455
456 do {
457 struct perf_event_attr attr;
458
459 memset(&attr, 0, sizeof(attr));
460
461 ret = pmu_format_parse(format, &formats);
462 if (ret)
463 break;
464
465 ret = pmu_config(&formats, &attr, terms);
466 if (ret)
467 break;
468
469 ret = -EINVAL;
470
471 if (attr.config != 0xc00000000002a823)
472 break;
473 if (attr.config1 != 0x8000400000000145)
474 break;
475 if (attr.config2 != 0x0400000020041d07)
476 break;
477
478 ret = 0;
479 } while (0);
480
481 test_format_dir_put(format);
482 return ret;
483}