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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a43783ae | 2 | #include <errno.h> |
877a7a11 | 3 | #include <linux/kernel.h> |
d944c4ee | 4 | #include <linux/types.h> |
fd20e811 | 5 | #include <inttypes.h> |
b55ae0a9 AH |
6 | #include <stdlib.h> |
7 | #include <unistd.h> | |
8 | #include <stdio.h> | |
b55ae0a9 | 9 | #include <string.h> |
391e4206 | 10 | #include <sys/param.h> |
9c3516d1 | 11 | #include <perf/cpumap.h> |
453fa030 | 12 | #include <perf/evlist.h> |
b55ae0a9 | 13 | |
b4209025 | 14 | #include "debug.h" |
4a3cec84 | 15 | #include "dso.h" |
f2a39fe8 | 16 | #include "env.h" |
b55ae0a9 | 17 | #include "parse-events.h" |
f2a39fe8 | 18 | #include "trace-event.h" |
b55ae0a9 AH |
19 | #include "evlist.h" |
20 | #include "evsel.h" | |
21 | #include "thread_map.h" | |
b55ae0a9 | 22 | #include "machine.h" |
1101f69a | 23 | #include "map.h" |
daecf9e0 | 24 | #include "symbol.h" |
b55ae0a9 | 25 | #include "event.h" |
aeb00b1a | 26 | #include "record.h" |
e0fcfb08 | 27 | #include "util/mmap.h" |
ea49e01c | 28 | #include "util/synthetic-events.h" |
b55ae0a9 AH |
29 | #include "thread.h" |
30 | ||
31 | #include "tests.h" | |
32 | ||
3052ba56 | 33 | #include <linux/ctype.h> |
3d689ed6 | 34 | |
b55ae0a9 AH |
35 | #define BUFSZ 1024 |
36 | #define READLEN 128 | |
37 | ||
7a77bc2c AH |
38 | struct state { |
39 | u64 done[1024]; | |
40 | size_t done_cnt; | |
41 | }; | |
42 | ||
b55ae0a9 AH |
43 | static unsigned int hex(char c) |
44 | { | |
45 | if (c >= '0' && c <= '9') | |
46 | return c - '0'; | |
47 | if (c >= 'a' && c <= 'f') | |
48 | return c - 'a' + 10; | |
49 | return c - 'A' + 10; | |
50 | } | |
51 | ||
b2d0dbf0 JS |
52 | static size_t read_objdump_chunk(const char **line, unsigned char **buf, |
53 | size_t *buf_len) | |
b55ae0a9 | 54 | { |
b2d0dbf0 JS |
55 | size_t bytes_read = 0; |
56 | unsigned char *chunk_start = *buf; | |
b55ae0a9 AH |
57 | |
58 | /* Read bytes */ | |
b2d0dbf0 | 59 | while (*buf_len > 0) { |
b55ae0a9 AH |
60 | char c1, c2; |
61 | ||
b55ae0a9 | 62 | /* Get 2 hex digits */ |
b2d0dbf0 JS |
63 | c1 = *(*line)++; |
64 | if (!isxdigit(c1)) | |
b55ae0a9 | 65 | break; |
b2d0dbf0 JS |
66 | c2 = *(*line)++; |
67 | if (!isxdigit(c2)) | |
b55ae0a9 | 68 | break; |
b2d0dbf0 JS |
69 | |
70 | /* Store byte and advance buf */ | |
71 | **buf = (hex(c1) << 4) | hex(c2); | |
72 | (*buf)++; | |
73 | (*buf_len)--; | |
74 | bytes_read++; | |
75 | ||
76 | /* End of chunk? */ | |
77 | if (isspace(**line)) | |
b55ae0a9 | 78 | break; |
b55ae0a9 | 79 | } |
b2d0dbf0 JS |
80 | |
81 | /* | |
82 | * objdump will display raw insn as LE if code endian | |
83 | * is LE and bytes_per_chunk > 1. In that case reverse | |
84 | * the chunk we just read. | |
85 | * | |
86 | * see disassemble_bytes() at binutils/objdump.c for details | |
87 | * how objdump chooses display endian) | |
88 | */ | |
89 | if (bytes_read > 1 && !bigendian()) { | |
90 | unsigned char *chunk_end = chunk_start + bytes_read - 1; | |
91 | unsigned char tmp; | |
92 | ||
93 | while (chunk_start < chunk_end) { | |
94 | tmp = *chunk_start; | |
95 | *chunk_start = *chunk_end; | |
96 | *chunk_end = tmp; | |
97 | chunk_start++; | |
98 | chunk_end--; | |
99 | } | |
100 | } | |
101 | ||
102 | return bytes_read; | |
103 | } | |
104 | ||
105 | static size_t read_objdump_line(const char *line, unsigned char *buf, | |
106 | size_t buf_len) | |
107 | { | |
108 | const char *p; | |
109 | size_t ret, bytes_read = 0; | |
110 | ||
111 | /* Skip to a colon */ | |
112 | p = strchr(line, ':'); | |
113 | if (!p) | |
114 | return 0; | |
115 | p++; | |
116 | ||
117 | /* Skip initial spaces */ | |
118 | while (*p) { | |
119 | if (!isspace(*p)) | |
120 | break; | |
121 | p++; | |
122 | } | |
123 | ||
124 | do { | |
125 | ret = read_objdump_chunk(&p, &buf, &buf_len); | |
126 | bytes_read += ret; | |
127 | p++; | |
128 | } while (ret > 0); | |
129 | ||
729a7ed1 | 130 | /* return number of successfully read bytes */ |
b2d0dbf0 | 131 | return bytes_read; |
b55ae0a9 AH |
132 | } |
133 | ||
729a7ed1 | 134 | static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) |
b55ae0a9 AH |
135 | { |
136 | char *line = NULL; | |
729a7ed1 | 137 | size_t line_len, off_last = 0; |
b55ae0a9 AH |
138 | ssize_t ret; |
139 | int err = 0; | |
edfdb7ea | 140 | u64 addr, last_addr = start_addr; |
729a7ed1 JS |
141 | |
142 | while (off_last < *len) { | |
143 | size_t off, read_bytes, written_bytes; | |
144 | unsigned char tmp[BUFSZ]; | |
b55ae0a9 | 145 | |
b55ae0a9 AH |
146 | ret = getline(&line, &line_len, f); |
147 | if (feof(f)) | |
148 | break; | |
149 | if (ret < 0) { | |
150 | pr_debug("getline failed\n"); | |
151 | err = -1; | |
152 | break; | |
153 | } | |
729a7ed1 JS |
154 | |
155 | /* read objdump data into temporary buffer */ | |
b2d0dbf0 | 156 | read_bytes = read_objdump_line(line, tmp, sizeof(tmp)); |
729a7ed1 JS |
157 | if (!read_bytes) |
158 | continue; | |
159 | ||
160 | if (sscanf(line, "%"PRIx64, &addr) != 1) | |
161 | continue; | |
edfdb7ea JS |
162 | if (addr < last_addr) { |
163 | pr_debug("addr going backwards, read beyond section?\n"); | |
164 | break; | |
165 | } | |
166 | last_addr = addr; | |
729a7ed1 JS |
167 | |
168 | /* copy it from temporary buffer to 'buf' according | |
169 | * to address on current objdump line */ | |
170 | off = addr - start_addr; | |
171 | if (off >= *len) | |
172 | break; | |
173 | written_bytes = MIN(read_bytes, *len - off); | |
174 | memcpy(buf + off, tmp, written_bytes); | |
175 | off_last = off + written_bytes; | |
b55ae0a9 AH |
176 | } |
177 | ||
729a7ed1 JS |
178 | /* len returns number of bytes that could not be read */ |
179 | *len -= off_last; | |
180 | ||
b55ae0a9 AH |
181 | free(line); |
182 | ||
183 | return err; | |
184 | } | |
185 | ||
186 | static int read_via_objdump(const char *filename, u64 addr, void *buf, | |
187 | size_t len) | |
188 | { | |
189 | char cmd[PATH_MAX * 2]; | |
190 | const char *fmt; | |
191 | FILE *f; | |
192 | int ret; | |
193 | ||
06f679c1 | 194 | fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s"; |
b55ae0a9 AH |
195 | ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len, |
196 | filename); | |
197 | if (ret <= 0 || (size_t)ret >= sizeof(cmd)) | |
198 | return -1; | |
199 | ||
200 | pr_debug("Objdump command is: %s\n", cmd); | |
201 | ||
7a77bc2c AH |
202 | /* Ignore objdump errors */ |
203 | strcat(cmd, " 2>/dev/null"); | |
204 | ||
b55ae0a9 AH |
205 | f = popen(cmd, "r"); |
206 | if (!f) { | |
207 | pr_debug("popen failed\n"); | |
208 | return -1; | |
209 | } | |
210 | ||
729a7ed1 | 211 | ret = read_objdump_output(f, buf, &len, addr); |
b55ae0a9 | 212 | if (len) { |
b2d0dbf0 | 213 | pr_debug("objdump read too few bytes: %zd\n", len); |
b55ae0a9 AH |
214 | if (!ret) |
215 | ret = len; | |
216 | } | |
217 | ||
218 | pclose(f); | |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
fd405cf6 JS |
223 | static void dump_buf(unsigned char *buf, size_t len) |
224 | { | |
225 | size_t i; | |
226 | ||
227 | for (i = 0; i < len; i++) { | |
228 | pr_debug("0x%02x ", buf[i]); | |
229 | if (i % 16 == 15) | |
230 | pr_debug("\n"); | |
231 | } | |
232 | pr_debug("\n"); | |
233 | } | |
234 | ||
b55ae0a9 | 235 | static int read_object_code(u64 addr, size_t len, u8 cpumode, |
29f9e521 | 236 | struct thread *thread, struct state *state) |
b55ae0a9 AH |
237 | { |
238 | struct addr_location al; | |
239 | unsigned char buf1[BUFSZ]; | |
240 | unsigned char buf2[BUFSZ]; | |
241 | size_t ret_len; | |
242 | u64 objdump_addr; | |
94df1040 NK |
243 | const char *objdump_name; |
244 | char decomp_name[KMOD_DECOMP_LEN]; | |
bcd4287e | 245 | bool decomp = false; |
b55ae0a9 AH |
246 | int ret; |
247 | ||
248 | pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr); | |
249 | ||
71a84b5a | 250 | if (!thread__find_map(thread, cpumode, addr, &al) || !al.map->dso) { |
9a805d86 RB |
251 | if (cpumode == PERF_RECORD_MISC_HYPERVISOR) { |
252 | pr_debug("Hypervisor address can not be resolved - skipping\n"); | |
253 | return 0; | |
254 | } | |
255 | ||
f07a2d32 | 256 | pr_debug("thread__find_map failed\n"); |
b55ae0a9 AH |
257 | return -1; |
258 | } | |
259 | ||
260 | pr_debug("File is: %s\n", al.map->dso->long_name); | |
261 | ||
7a77bc2c AH |
262 | if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS && |
263 | !dso__is_kcore(al.map->dso)) { | |
b55ae0a9 AH |
264 | pr_debug("Unexpected kernel address - skipping\n"); |
265 | return 0; | |
266 | } | |
267 | ||
268 | pr_debug("On file address is: %#"PRIx64"\n", al.addr); | |
269 | ||
270 | if (len > BUFSZ) | |
271 | len = BUFSZ; | |
272 | ||
273 | /* Do not go off the map */ | |
274 | if (addr + len > al.map->end) | |
275 | len = al.map->end - addr; | |
276 | ||
277 | /* Read the object code using perf */ | |
29f9e521 ACM |
278 | ret_len = dso__data_read_offset(al.map->dso, thread->mg->machine, |
279 | al.addr, buf1, len); | |
b55ae0a9 AH |
280 | if (ret_len != len) { |
281 | pr_debug("dso__data_read_offset failed\n"); | |
282 | return -1; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Converting addresses for use by objdump requires more information. | |
287 | * map__load() does that. See map__rip_2objdump() for details. | |
288 | */ | |
be39db9f | 289 | if (map__load(al.map)) |
b55ae0a9 AH |
290 | return -1; |
291 | ||
7a77bc2c AH |
292 | /* objdump struggles with kcore - try each map only once */ |
293 | if (dso__is_kcore(al.map->dso)) { | |
294 | size_t d; | |
295 | ||
296 | for (d = 0; d < state->done_cnt; d++) { | |
297 | if (state->done[d] == al.map->start) { | |
298 | pr_debug("kcore map tested already"); | |
299 | pr_debug(" - skipping\n"); | |
300 | return 0; | |
301 | } | |
302 | } | |
303 | if (state->done_cnt >= ARRAY_SIZE(state->done)) { | |
304 | pr_debug("Too many kcore maps - skipping\n"); | |
305 | return 0; | |
306 | } | |
307 | state->done[state->done_cnt++] = al.map->start; | |
308 | } | |
309 | ||
94df1040 NK |
310 | objdump_name = al.map->dso->long_name; |
311 | if (dso__needs_decompress(al.map->dso)) { | |
312 | if (dso__decompress_kmodule_path(al.map->dso, objdump_name, | |
313 | decomp_name, | |
314 | sizeof(decomp_name)) < 0) { | |
315 | pr_debug("decompression failed\n"); | |
316 | return -1; | |
317 | } | |
318 | ||
bcd4287e | 319 | decomp = true; |
94df1040 NK |
320 | objdump_name = decomp_name; |
321 | } | |
322 | ||
b55ae0a9 AH |
323 | /* Read the object code using objdump */ |
324 | objdump_addr = map__rip_2objdump(al.map, al.addr); | |
94df1040 NK |
325 | ret = read_via_objdump(objdump_name, objdump_addr, buf2, len); |
326 | ||
bcd4287e | 327 | if (decomp) |
94df1040 NK |
328 | unlink(objdump_name); |
329 | ||
b55ae0a9 AH |
330 | if (ret > 0) { |
331 | /* | |
332 | * The kernel maps are inaccurate - assume objdump is right in | |
333 | * that case. | |
334 | */ | |
335 | if (cpumode == PERF_RECORD_MISC_KERNEL || | |
336 | cpumode == PERF_RECORD_MISC_GUEST_KERNEL) { | |
337 | len -= ret; | |
7a77bc2c | 338 | if (len) { |
b55ae0a9 | 339 | pr_debug("Reducing len to %zu\n", len); |
7a77bc2c AH |
340 | } else if (dso__is_kcore(al.map->dso)) { |
341 | /* | |
342 | * objdump cannot handle very large segments | |
343 | * that may be found in kcore. | |
344 | */ | |
345 | pr_debug("objdump failed for kcore"); | |
346 | pr_debug(" - skipping\n"); | |
347 | return 0; | |
348 | } else { | |
b55ae0a9 | 349 | return -1; |
7a77bc2c | 350 | } |
b55ae0a9 AH |
351 | } |
352 | } | |
353 | if (ret < 0) { | |
354 | pr_debug("read_via_objdump failed\n"); | |
355 | return -1; | |
356 | } | |
357 | ||
358 | /* The results should be identical */ | |
359 | if (memcmp(buf1, buf2, len)) { | |
360 | pr_debug("Bytes read differ from those read by objdump\n"); | |
fd405cf6 JS |
361 | pr_debug("buf1 (dso):\n"); |
362 | dump_buf(buf1, len); | |
363 | pr_debug("buf2 (objdump):\n"); | |
364 | dump_buf(buf2, len); | |
b55ae0a9 AH |
365 | return -1; |
366 | } | |
367 | pr_debug("Bytes read match those read by objdump\n"); | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static int process_sample_event(struct machine *machine, | |
63503dba | 373 | struct evlist *evlist, |
7a77bc2c | 374 | union perf_event *event, struct state *state) |
b55ae0a9 AH |
375 | { |
376 | struct perf_sample sample; | |
377 | struct thread *thread; | |
b91fc39f | 378 | int ret; |
b55ae0a9 AH |
379 | |
380 | if (perf_evlist__parse_sample(evlist, event, &sample)) { | |
381 | pr_debug("perf_evlist__parse_sample failed\n"); | |
382 | return -1; | |
383 | } | |
384 | ||
13ce34df | 385 | thread = machine__findnew_thread(machine, sample.pid, sample.tid); |
b55ae0a9 AH |
386 | if (!thread) { |
387 | pr_debug("machine__findnew_thread failed\n"); | |
388 | return -1; | |
389 | } | |
390 | ||
473398a2 | 391 | ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread, state); |
b91fc39f ACM |
392 | thread__put(thread); |
393 | return ret; | |
b55ae0a9 AH |
394 | } |
395 | ||
63503dba | 396 | static int process_event(struct machine *machine, struct evlist *evlist, |
7a77bc2c | 397 | union perf_event *event, struct state *state) |
b55ae0a9 AH |
398 | { |
399 | if (event->header.type == PERF_RECORD_SAMPLE) | |
7a77bc2c | 400 | return process_sample_event(machine, evlist, event, state); |
b55ae0a9 | 401 | |
48095b72 AH |
402 | if (event->header.type == PERF_RECORD_THROTTLE || |
403 | event->header.type == PERF_RECORD_UNTHROTTLE) | |
404 | return 0; | |
405 | ||
406 | if (event->header.type < PERF_RECORD_MAX) { | |
407 | int ret; | |
408 | ||
409 | ret = machine__process_event(machine, event, NULL); | |
410 | if (ret < 0) | |
411 | pr_debug("machine__process_event failed, event type %u\n", | |
412 | event->header.type); | |
413 | return ret; | |
414 | } | |
b55ae0a9 AH |
415 | |
416 | return 0; | |
417 | } | |
418 | ||
63503dba | 419 | static int process_events(struct machine *machine, struct evlist *evlist, |
7a77bc2c | 420 | struct state *state) |
b55ae0a9 AH |
421 | { |
422 | union perf_event *event; | |
a5830532 | 423 | struct mmap *md; |
b55ae0a9 AH |
424 | int i, ret; |
425 | ||
c976ee11 | 426 | for (i = 0; i < evlist->core.nr_mmaps; i++) { |
00fc2460 | 427 | md = &evlist->mmap[i]; |
b9bae2c8 | 428 | if (perf_mmap__read_init(md) < 0) |
00fc2460 KL |
429 | continue; |
430 | ||
0019dc87 | 431 | while ((event = perf_mmap__read_event(md)) != NULL) { |
7a77bc2c | 432 | ret = process_event(machine, evlist, event, state); |
d6ace3df | 433 | perf_mmap__consume(md); |
b55ae0a9 AH |
434 | if (ret < 0) |
435 | return ret; | |
436 | } | |
00fc2460 | 437 | perf_mmap__read_done(md); |
b55ae0a9 AH |
438 | } |
439 | return 0; | |
440 | } | |
441 | ||
442 | static int comp(const void *a, const void *b) | |
443 | { | |
444 | return *(int *)a - *(int *)b; | |
445 | } | |
446 | ||
447 | static void do_sort_something(void) | |
448 | { | |
309b5185 | 449 | int buf[40960], i; |
b55ae0a9 | 450 | |
309b5185 DA |
451 | for (i = 0; i < (int)ARRAY_SIZE(buf); i++) |
452 | buf[i] = ARRAY_SIZE(buf) - i - 1; | |
b55ae0a9 | 453 | |
309b5185 | 454 | qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp); |
b55ae0a9 | 455 | |
309b5185 | 456 | for (i = 0; i < (int)ARRAY_SIZE(buf); i++) { |
b55ae0a9 AH |
457 | if (buf[i] != i) { |
458 | pr_debug("qsort failed\n"); | |
459 | break; | |
460 | } | |
461 | } | |
462 | } | |
463 | ||
464 | static void sort_something(void) | |
465 | { | |
466 | int i; | |
467 | ||
468 | for (i = 0; i < 10; i++) | |
469 | do_sort_something(); | |
470 | } | |
471 | ||
472 | static void syscall_something(void) | |
473 | { | |
474 | int pipefd[2]; | |
475 | int i; | |
476 | ||
477 | for (i = 0; i < 1000; i++) { | |
478 | if (pipe(pipefd) < 0) { | |
479 | pr_debug("pipe failed\n"); | |
480 | break; | |
481 | } | |
482 | close(pipefd[1]); | |
483 | close(pipefd[0]); | |
484 | } | |
485 | } | |
486 | ||
487 | static void fs_something(void) | |
488 | { | |
489 | const char *test_file_name = "temp-perf-code-reading-test-file--"; | |
490 | FILE *f; | |
491 | int i; | |
492 | ||
493 | for (i = 0; i < 1000; i++) { | |
494 | f = fopen(test_file_name, "w+"); | |
495 | if (f) { | |
496 | fclose(f); | |
497 | unlink(test_file_name); | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
f2a39fe8 ACM |
502 | #ifdef __s390x__ |
503 | #include "header.h" // for get_cpuid() | |
504 | #endif | |
505 | ||
b3be39c5 TR |
506 | static const char *do_determine_event(bool excl_kernel) |
507 | { | |
508 | const char *event = excl_kernel ? "cycles:u" : "cycles"; | |
509 | ||
510 | #ifdef __s390x__ | |
511 | char cpuid[128], model[16], model_c[16], cpum_cf_v[16]; | |
512 | unsigned int family; | |
513 | int ret, cpum_cf_a; | |
514 | ||
515 | if (get_cpuid(cpuid, sizeof(cpuid))) | |
516 | goto out_clocks; | |
517 | ret = sscanf(cpuid, "%*[^,],%u,%[^,],%[^,],%[^,],%x", &family, model_c, | |
518 | model, cpum_cf_v, &cpum_cf_a); | |
519 | if (ret != 5) /* Not available */ | |
520 | goto out_clocks; | |
521 | if (excl_kernel && (cpum_cf_a & 4)) | |
522 | return event; | |
523 | if (!excl_kernel && (cpum_cf_a & 2)) | |
524 | return event; | |
525 | ||
526 | /* Fall through: missing authorization */ | |
527 | out_clocks: | |
528 | event = excl_kernel ? "cpu-clock:u" : "cpu-clock"; | |
529 | ||
530 | #endif | |
531 | return event; | |
532 | } | |
533 | ||
b55ae0a9 AH |
534 | static void do_something(void) |
535 | { | |
536 | fs_something(); | |
537 | ||
538 | sort_something(); | |
539 | ||
540 | syscall_something(); | |
541 | } | |
542 | ||
543 | enum { | |
544 | TEST_CODE_READING_OK, | |
545 | TEST_CODE_READING_NO_VMLINUX, | |
7a77bc2c | 546 | TEST_CODE_READING_NO_KCORE, |
b55ae0a9 | 547 | TEST_CODE_READING_NO_ACCESS, |
7a77bc2c | 548 | TEST_CODE_READING_NO_KERNEL_OBJ, |
b55ae0a9 AH |
549 | }; |
550 | ||
7a77bc2c | 551 | static int do_test_code_reading(bool try_kcore) |
b55ae0a9 | 552 | { |
b55ae0a9 AH |
553 | struct machine *machine; |
554 | struct thread *thread; | |
b4006796 | 555 | struct record_opts opts = { |
b55ae0a9 AH |
556 | .mmap_pages = UINT_MAX, |
557 | .user_freq = UINT_MAX, | |
558 | .user_interval = ULLONG_MAX, | |
5243ba76 | 559 | .freq = 500, |
b55ae0a9 AH |
560 | .target = { |
561 | .uses_mmap = true, | |
562 | }, | |
563 | }; | |
7a77bc2c AH |
564 | struct state state = { |
565 | .done_cnt = 0, | |
566 | }; | |
9749b90e | 567 | struct perf_thread_map *threads = NULL; |
f854839b | 568 | struct perf_cpu_map *cpus = NULL; |
63503dba | 569 | struct evlist *evlist = NULL; |
32dcd021 | 570 | struct evsel *evsel = NULL; |
b55ae0a9 AH |
571 | int err = -1, ret; |
572 | pid_t pid; | |
573 | struct map *map; | |
7a77bc2c | 574 | bool have_vmlinux, have_kcore, excl_kernel = false; |
b55ae0a9 AH |
575 | |
576 | pid = getpid(); | |
577 | ||
0fd4008e | 578 | machine = machine__new_host(); |
f6c66d73 | 579 | machine->env = &perf_env; |
b55ae0a9 AH |
580 | |
581 | ret = machine__create_kernel_maps(machine); | |
582 | if (ret < 0) { | |
583 | pr_debug("machine__create_kernel_maps failed\n"); | |
584 | goto out_err; | |
585 | } | |
586 | ||
7a77bc2c AH |
587 | /* Force the use of kallsyms instead of vmlinux to try kcore */ |
588 | if (try_kcore) | |
589 | symbol_conf.kallsyms_name = "/proc/kallsyms"; | |
590 | ||
b55ae0a9 | 591 | /* Load kernel map */ |
a5e813c6 | 592 | map = machine__kernel_map(machine); |
be39db9f | 593 | ret = map__load(map); |
b55ae0a9 AH |
594 | if (ret < 0) { |
595 | pr_debug("map__load failed\n"); | |
596 | goto out_err; | |
597 | } | |
7a77bc2c AH |
598 | have_vmlinux = dso__is_vmlinux(map->dso); |
599 | have_kcore = dso__is_kcore(map->dso); | |
600 | ||
601 | /* 2nd time through we just try kcore */ | |
602 | if (try_kcore && !have_kcore) | |
603 | return TEST_CODE_READING_NO_KCORE; | |
604 | ||
605 | /* No point getting kernel events if there is no kernel object */ | |
606 | if (!have_vmlinux && !have_kcore) | |
b55ae0a9 AH |
607 | excl_kernel = true; |
608 | ||
609 | threads = thread_map__new_by_tid(pid); | |
610 | if (!threads) { | |
611 | pr_debug("thread_map__new_by_tid failed\n"); | |
612 | goto out_err; | |
613 | } | |
614 | ||
615 | ret = perf_event__synthesize_thread_map(NULL, threads, | |
3fcb10e4 | 616 | perf_event__process, machine, false); |
b55ae0a9 AH |
617 | if (ret < 0) { |
618 | pr_debug("perf_event__synthesize_thread_map failed\n"); | |
619 | goto out_err; | |
620 | } | |
621 | ||
314add6b | 622 | thread = machine__findnew_thread(machine, pid, pid); |
b55ae0a9 AH |
623 | if (!thread) { |
624 | pr_debug("machine__findnew_thread failed\n"); | |
b91fc39f | 625 | goto out_put; |
b55ae0a9 AH |
626 | } |
627 | ||
9c3516d1 | 628 | cpus = perf_cpu_map__new(NULL); |
b55ae0a9 | 629 | if (!cpus) { |
9c3516d1 | 630 | pr_debug("perf_cpu_map__new failed\n"); |
b91fc39f | 631 | goto out_put; |
b55ae0a9 AH |
632 | } |
633 | ||
634 | while (1) { | |
635 | const char *str; | |
636 | ||
0f98b11c | 637 | evlist = evlist__new(); |
b55ae0a9 AH |
638 | if (!evlist) { |
639 | pr_debug("perf_evlist__new failed\n"); | |
b91fc39f | 640 | goto out_put; |
b55ae0a9 AH |
641 | } |
642 | ||
453fa030 | 643 | perf_evlist__set_maps(&evlist->core, cpus, threads); |
b55ae0a9 | 644 | |
b3be39c5 | 645 | str = do_determine_event(excl_kernel); |
b55ae0a9 | 646 | pr_debug("Parsing event '%s'\n", str); |
b39b8393 | 647 | ret = parse_events(evlist, str, NULL); |
b55ae0a9 AH |
648 | if (ret < 0) { |
649 | pr_debug("parse_events failed\n"); | |
b91fc39f | 650 | goto out_put; |
b55ae0a9 AH |
651 | } |
652 | ||
e68ae9cf | 653 | perf_evlist__config(evlist, &opts, NULL); |
b55ae0a9 | 654 | |
515dbe48 | 655 | evsel = evlist__first(evlist); |
b55ae0a9 | 656 | |
1fc632ce JO |
657 | evsel->core.attr.comm = 1; |
658 | evsel->core.attr.disabled = 1; | |
659 | evsel->core.attr.enable_on_exec = 0; | |
b55ae0a9 | 660 | |
474ddc4c | 661 | ret = evlist__open(evlist); |
b55ae0a9 AH |
662 | if (ret < 0) { |
663 | if (!excl_kernel) { | |
664 | excl_kernel = true; | |
7320b1b3 JO |
665 | /* |
666 | * Both cpus and threads are now owned by evlist | |
667 | * and will be freed by following perf_evlist__set_maps | |
668 | * call. Getting refference to keep them alive. | |
669 | */ | |
38f01d8d | 670 | perf_cpu_map__get(cpus); |
7836e52e | 671 | perf_thread_map__get(threads); |
453fa030 | 672 | perf_evlist__set_maps(&evlist->core, NULL, NULL); |
c12995a5 | 673 | evlist__delete(evlist); |
b55ae0a9 AH |
674 | evlist = NULL; |
675 | continue; | |
676 | } | |
6880bbf9 | 677 | |
bb963e16 | 678 | if (verbose > 0) { |
6880bbf9 ACM |
679 | char errbuf[512]; |
680 | perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf)); | |
681 | pr_debug("perf_evlist__open() failed!\n%s\n", errbuf); | |
682 | } | |
683 | ||
b91fc39f | 684 | goto out_put; |
b55ae0a9 AH |
685 | } |
686 | break; | |
687 | } | |
688 | ||
9521b5f2 | 689 | ret = evlist__mmap(evlist, UINT_MAX); |
b55ae0a9 | 690 | if (ret < 0) { |
9521b5f2 | 691 | pr_debug("evlist__mmap failed\n"); |
b91fc39f | 692 | goto out_put; |
b55ae0a9 AH |
693 | } |
694 | ||
1c87f165 | 695 | evlist__enable(evlist); |
b55ae0a9 AH |
696 | |
697 | do_something(); | |
698 | ||
e74676de | 699 | evlist__disable(evlist); |
b55ae0a9 | 700 | |
7a77bc2c | 701 | ret = process_events(machine, evlist, &state); |
b55ae0a9 | 702 | if (ret < 0) |
b91fc39f | 703 | goto out_put; |
b55ae0a9 | 704 | |
7a77bc2c AH |
705 | if (!have_vmlinux && !have_kcore && !try_kcore) |
706 | err = TEST_CODE_READING_NO_KERNEL_OBJ; | |
707 | else if (!have_vmlinux && !try_kcore) | |
b55ae0a9 AH |
708 | err = TEST_CODE_READING_NO_VMLINUX; |
709 | else if (excl_kernel) | |
710 | err = TEST_CODE_READING_NO_ACCESS; | |
711 | else | |
712 | err = TEST_CODE_READING_OK; | |
b91fc39f ACM |
713 | out_put: |
714 | thread__put(thread); | |
b55ae0a9 | 715 | out_err: |
b91fc39f | 716 | |
b55ae0a9 | 717 | if (evlist) { |
c12995a5 | 718 | evlist__delete(evlist); |
03ad9747 | 719 | } else { |
38f01d8d | 720 | perf_cpu_map__put(cpus); |
7836e52e | 721 | perf_thread_map__put(threads); |
03ad9747 | 722 | } |
b55ae0a9 | 723 | machine__delete_threads(machine); |
0fd4008e | 724 | machine__delete(machine); |
b55ae0a9 AH |
725 | |
726 | return err; | |
727 | } | |
728 | ||
81f17c90 | 729 | int test__code_reading(struct test *test __maybe_unused, int subtest __maybe_unused) |
b55ae0a9 AH |
730 | { |
731 | int ret; | |
732 | ||
7a77bc2c AH |
733 | ret = do_test_code_reading(false); |
734 | if (!ret) | |
735 | ret = do_test_code_reading(true); | |
b55ae0a9 AH |
736 | |
737 | switch (ret) { | |
738 | case TEST_CODE_READING_OK: | |
739 | return 0; | |
740 | case TEST_CODE_READING_NO_VMLINUX: | |
597bdeb4 | 741 | pr_debug("no vmlinux\n"); |
b55ae0a9 | 742 | return 0; |
7a77bc2c | 743 | case TEST_CODE_READING_NO_KCORE: |
597bdeb4 | 744 | pr_debug("no kcore\n"); |
7a77bc2c | 745 | return 0; |
b55ae0a9 | 746 | case TEST_CODE_READING_NO_ACCESS: |
597bdeb4 | 747 | pr_debug("no access\n"); |
b55ae0a9 | 748 | return 0; |
7a77bc2c | 749 | case TEST_CODE_READING_NO_KERNEL_OBJ: |
597bdeb4 | 750 | pr_debug("no kernel obj\n"); |
7a77bc2c | 751 | return 0; |
b55ae0a9 AH |
752 | default: |
753 | return -1; | |
754 | }; | |
755 | } |