1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright(C) 2015 Linaro Limited. All rights reserved.
4 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
5 */
6
7 #include <api/fs/fs.h>
8 #include <linux/bits.h>
9 #include <linux/bitops.h>
10 #include <linux/compiler.h>
11 #include <linux/coresight-pmu.h>
12 #include <linux/kernel.h>
13 #include <linux/log2.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/zalloc.h>
17
18 #include "cs-etm.h"
19 #include "../../../util/debug.h"
20 #include "../../../util/record.h"
21 #include "../../../util/auxtrace.h"
22 #include "../../../util/cpumap.h"
23 #include "../../../util/event.h"
24 #include "../../../util/evlist.h"
25 #include "../../../util/evsel.h"
26 #include "../../../util/perf_api_probe.h"
27 #include "../../../util/evsel_config.h"
28 #include "../../../util/pmu.h"
29 #include "../../../util/cs-etm.h"
30 #include <internal/lib.h> // page_size
31 #include "../../../util/session.h"
32
33 #include <errno.h>
34 #include <stdlib.h>
35 #include <sys/stat.h>
36
37 struct cs_etm_recording {
38 struct auxtrace_record itr;
39 struct perf_pmu *cs_etm_pmu;
40 struct evlist *evlist;
41 bool snapshot_mode;
42 size_t snapshot_size;
43 };
44
45 static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = {
46 [CS_ETM_ETMCCER] = "mgmt/etmccer",
47 [CS_ETM_ETMIDR] = "mgmt/etmidr",
48 };
49
50 static const char * const metadata_etmv4_ro[] = {
51 [CS_ETMV4_TRCIDR0] = "trcidr/trcidr0",
52 [CS_ETMV4_TRCIDR1] = "trcidr/trcidr1",
53 [CS_ETMV4_TRCIDR2] = "trcidr/trcidr2",
54 [CS_ETMV4_TRCIDR8] = "trcidr/trcidr8",
55 [CS_ETMV4_TRCAUTHSTATUS] = "mgmt/trcauthstatus",
56 [CS_ETE_TRCDEVARCH] = "mgmt/trcdevarch"
57 };
58
59 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu);
60 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu);
61
cs_etm_set_context_id(struct auxtrace_record * itr,struct evsel * evsel,int cpu)62 static int cs_etm_set_context_id(struct auxtrace_record *itr,
63 struct evsel *evsel, int cpu)
64 {
65 struct cs_etm_recording *ptr;
66 struct perf_pmu *cs_etm_pmu;
67 char path[PATH_MAX];
68 int err = -EINVAL;
69 u32 val;
70 u64 contextid;
71
72 ptr = container_of(itr, struct cs_etm_recording, itr);
73 cs_etm_pmu = ptr->cs_etm_pmu;
74
75 if (!cs_etm_is_etmv4(itr, cpu))
76 goto out;
77
78 /* Get a handle on TRCIDR2 */
79 snprintf(path, PATH_MAX, "cpu%d/%s",
80 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
81 err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
82
83 /* There was a problem reading the file, bailing out */
84 if (err != 1) {
85 pr_err("%s: can't read file %s\n",
86 CORESIGHT_ETM_PMU_NAME, path);
87 goto out;
88 }
89
90 /* User has configured for PID tracing, respects it. */
91 contextid = evsel->core.attr.config &
92 (BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_CTXTID2));
93
94 /*
95 * If user doesn't configure the contextid format, parse PMU format and
96 * enable PID tracing according to the "contextid" format bits:
97 *
98 * If bit ETM_OPT_CTXTID is set, trace CONTEXTIDR_EL1;
99 * If bit ETM_OPT_CTXTID2 is set, trace CONTEXTIDR_EL2.
100 */
101 if (!contextid)
102 contextid = perf_pmu__format_bits(&cs_etm_pmu->format,
103 "contextid");
104
105 if (contextid & BIT(ETM_OPT_CTXTID)) {
106 /*
107 * TRCIDR2.CIDSIZE, bit [9-5], indicates whether contextID
108 * tracing is supported:
109 * 0b00000 Context ID tracing is not supported.
110 * 0b00100 Maximum of 32-bit Context ID size.
111 * All other values are reserved.
112 */
113 val = BMVAL(val, 5, 9);
114 if (!val || val != 0x4) {
115 pr_err("%s: CONTEXTIDR_EL1 isn't supported\n",
116 CORESIGHT_ETM_PMU_NAME);
117 err = -EINVAL;
118 goto out;
119 }
120 }
121
122 if (contextid & BIT(ETM_OPT_CTXTID2)) {
123 /*
124 * TRCIDR2.VMIDOPT[30:29] != 0 and
125 * TRCIDR2.VMIDSIZE[14:10] == 0b00100 (32bit virtual contextid)
126 * We can't support CONTEXTIDR in VMID if the size of the
127 * virtual context id is < 32bit.
128 * Any value of VMIDSIZE >= 4 (i.e, > 32bit) is fine for us.
129 */
130 if (!BMVAL(val, 29, 30) || BMVAL(val, 10, 14) < 4) {
131 pr_err("%s: CONTEXTIDR_EL2 isn't supported\n",
132 CORESIGHT_ETM_PMU_NAME);
133 err = -EINVAL;
134 goto out;
135 }
136 }
137
138 /* All good, let the kernel know */
139 evsel->core.attr.config |= contextid;
140 err = 0;
141
142 out:
143 return err;
144 }
145
cs_etm_set_timestamp(struct auxtrace_record * itr,struct evsel * evsel,int cpu)146 static int cs_etm_set_timestamp(struct auxtrace_record *itr,
147 struct evsel *evsel, int cpu)
148 {
149 struct cs_etm_recording *ptr;
150 struct perf_pmu *cs_etm_pmu;
151 char path[PATH_MAX];
152 int err = -EINVAL;
153 u32 val;
154
155 ptr = container_of(itr, struct cs_etm_recording, itr);
156 cs_etm_pmu = ptr->cs_etm_pmu;
157
158 if (!cs_etm_is_etmv4(itr, cpu))
159 goto out;
160
161 /* Get a handle on TRCIRD0 */
162 snprintf(path, PATH_MAX, "cpu%d/%s",
163 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
164 err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
165
166 /* There was a problem reading the file, bailing out */
167 if (err != 1) {
168 pr_err("%s: can't read file %s\n",
169 CORESIGHT_ETM_PMU_NAME, path);
170 goto out;
171 }
172
173 /*
174 * TRCIDR0.TSSIZE, bit [28-24], indicates whether global timestamping
175 * is supported:
176 * 0b00000 Global timestamping is not implemented
177 * 0b00110 Implementation supports a maximum timestamp of 48bits.
178 * 0b01000 Implementation supports a maximum timestamp of 64bits.
179 */
180 val &= GENMASK(28, 24);
181 if (!val) {
182 err = -EINVAL;
183 goto out;
184 }
185
186 /* All good, let the kernel know */
187 evsel->core.attr.config |= (1 << ETM_OPT_TS);
188 err = 0;
189
190 out:
191 return err;
192 }
193
194 #define ETM_SET_OPT_CTXTID (1 << 0)
195 #define ETM_SET_OPT_TS (1 << 1)
196 #define ETM_SET_OPT_MASK (ETM_SET_OPT_CTXTID | ETM_SET_OPT_TS)
197
cs_etm_set_option(struct auxtrace_record * itr,struct evsel * evsel,u32 option)198 static int cs_etm_set_option(struct auxtrace_record *itr,
199 struct evsel *evsel, u32 option)
200 {
201 int i, err = -EINVAL;
202 struct perf_cpu_map *event_cpus = evsel->evlist->core.user_requested_cpus;
203 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
204
205 /* Set option of each CPU we have */
206 for (i = 0; i < cpu__max_cpu().cpu; i++) {
207 struct perf_cpu cpu = { .cpu = i, };
208
209 if (!perf_cpu_map__has(event_cpus, cpu) ||
210 !perf_cpu_map__has(online_cpus, cpu))
211 continue;
212
213 if (option & BIT(ETM_OPT_CTXTID)) {
214 err = cs_etm_set_context_id(itr, evsel, i);
215 if (err)
216 goto out;
217 }
218 if (option & BIT(ETM_OPT_TS)) {
219 err = cs_etm_set_timestamp(itr, evsel, i);
220 if (err)
221 goto out;
222 }
223 if (option & ~(BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_TS)))
224 /* Nothing else is currently supported */
225 goto out;
226 }
227
228 err = 0;
229 out:
230 perf_cpu_map__put(online_cpus);
231 return err;
232 }
233
cs_etm_parse_snapshot_options(struct auxtrace_record * itr,struct record_opts * opts,const char * str)234 static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr,
235 struct record_opts *opts,
236 const char *str)
237 {
238 struct cs_etm_recording *ptr =
239 container_of(itr, struct cs_etm_recording, itr);
240 unsigned long long snapshot_size = 0;
241 char *endptr;
242
243 if (str) {
244 snapshot_size = strtoull(str, &endptr, 0);
245 if (*endptr || snapshot_size > SIZE_MAX)
246 return -1;
247 }
248
249 opts->auxtrace_snapshot_mode = true;
250 opts->auxtrace_snapshot_size = snapshot_size;
251 ptr->snapshot_size = snapshot_size;
252
253 return 0;
254 }
255
cs_etm_set_sink_attr(struct perf_pmu * pmu,struct evsel * evsel)256 static int cs_etm_set_sink_attr(struct perf_pmu *pmu,
257 struct evsel *evsel)
258 {
259 char msg[BUFSIZ], path[PATH_MAX], *sink;
260 struct evsel_config_term *term;
261 int ret = -EINVAL;
262 u32 hash;
263
264 if (evsel->core.attr.config2 & GENMASK(31, 0))
265 return 0;
266
267 list_for_each_entry(term, &evsel->config_terms, list) {
268 if (term->type != EVSEL__CONFIG_TERM_DRV_CFG)
269 continue;
270
271 sink = term->val.str;
272 snprintf(path, PATH_MAX, "sinks/%s", sink);
273
274 ret = perf_pmu__scan_file(pmu, path, "%x", &hash);
275 if (ret != 1) {
276 pr_err("failed to set sink \"%s\" on event %s with %d (%s)\n",
277 sink, evsel__name(evsel), errno,
278 str_error_r(errno, msg, sizeof(msg)));
279 return ret;
280 }
281
282 evsel->core.attr.config2 |= hash;
283 return 0;
284 }
285
286 /*
287 * No sink was provided on the command line - allow the CoreSight
288 * system to look for a default
289 */
290 return 0;
291 }
292
cs_etm_recording_options(struct auxtrace_record * itr,struct evlist * evlist,struct record_opts * opts)293 static int cs_etm_recording_options(struct auxtrace_record *itr,
294 struct evlist *evlist,
295 struct record_opts *opts)
296 {
297 int ret;
298 struct cs_etm_recording *ptr =
299 container_of(itr, struct cs_etm_recording, itr);
300 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
301 struct evsel *evsel, *cs_etm_evsel = NULL;
302 struct perf_cpu_map *cpus = evlist->core.user_requested_cpus;
303 bool privileged = perf_event_paranoid_check(-1);
304 int err = 0;
305
306 ptr->evlist = evlist;
307 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
308
309 if (!record_opts__no_switch_events(opts) &&
310 perf_can_record_switch_events())
311 opts->record_switch_events = true;
312
313 evlist__for_each_entry(evlist, evsel) {
314 if (evsel->core.attr.type == cs_etm_pmu->type) {
315 if (cs_etm_evsel) {
316 pr_err("There may be only one %s event\n",
317 CORESIGHT_ETM_PMU_NAME);
318 return -EINVAL;
319 }
320 evsel->core.attr.freq = 0;
321 evsel->core.attr.sample_period = 1;
322 evsel->needs_auxtrace_mmap = true;
323 cs_etm_evsel = evsel;
324 opts->full_auxtrace = true;
325 }
326 }
327
328 /* no need to continue if at least one event of interest was found */
329 if (!cs_etm_evsel)
330 return 0;
331
332 ret = cs_etm_set_sink_attr(cs_etm_pmu, cs_etm_evsel);
333 if (ret)
334 return ret;
335
336 if (opts->use_clockid) {
337 pr_err("Cannot use clockid (-k option) with %s\n",
338 CORESIGHT_ETM_PMU_NAME);
339 return -EINVAL;
340 }
341
342 /* we are in snapshot mode */
343 if (opts->auxtrace_snapshot_mode) {
344 /*
345 * No size were given to '-S' or '-m,', so go with
346 * the default
347 */
348 if (!opts->auxtrace_snapshot_size &&
349 !opts->auxtrace_mmap_pages) {
350 if (privileged) {
351 opts->auxtrace_mmap_pages = MiB(4) / page_size;
352 } else {
353 opts->auxtrace_mmap_pages =
354 KiB(128) / page_size;
355 if (opts->mmap_pages == UINT_MAX)
356 opts->mmap_pages = KiB(256) / page_size;
357 }
358 } else if (!opts->auxtrace_mmap_pages && !privileged &&
359 opts->mmap_pages == UINT_MAX) {
360 opts->mmap_pages = KiB(256) / page_size;
361 }
362
363 /*
364 * '-m,xyz' was specified but no snapshot size, so make the
365 * snapshot size as big as the auxtrace mmap area.
366 */
367 if (!opts->auxtrace_snapshot_size) {
368 opts->auxtrace_snapshot_size =
369 opts->auxtrace_mmap_pages * (size_t)page_size;
370 }
371
372 /*
373 * -Sxyz was specified but no auxtrace mmap area, so make the
374 * auxtrace mmap area big enough to fit the requested snapshot
375 * size.
376 */
377 if (!opts->auxtrace_mmap_pages) {
378 size_t sz = opts->auxtrace_snapshot_size;
379
380 sz = round_up(sz, page_size) / page_size;
381 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
382 }
383
384 /* Snapshot size can't be bigger than the auxtrace area */
385 if (opts->auxtrace_snapshot_size >
386 opts->auxtrace_mmap_pages * (size_t)page_size) {
387 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
388 opts->auxtrace_snapshot_size,
389 opts->auxtrace_mmap_pages * (size_t)page_size);
390 return -EINVAL;
391 }
392
393 /* Something went wrong somewhere - this shouldn't happen */
394 if (!opts->auxtrace_snapshot_size ||
395 !opts->auxtrace_mmap_pages) {
396 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
397 return -EINVAL;
398 }
399 }
400
401 /* We are in full trace mode but '-m,xyz' wasn't specified */
402 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
403 if (privileged) {
404 opts->auxtrace_mmap_pages = MiB(4) / page_size;
405 } else {
406 opts->auxtrace_mmap_pages = KiB(128) / page_size;
407 if (opts->mmap_pages == UINT_MAX)
408 opts->mmap_pages = KiB(256) / page_size;
409 }
410
411 }
412
413 if (opts->auxtrace_snapshot_mode)
414 pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
415 opts->auxtrace_snapshot_size);
416
417 /*
418 * To obtain the auxtrace buffer file descriptor, the auxtrace
419 * event must come first.
420 */
421 evlist__to_front(evlist, cs_etm_evsel);
422
423 /*
424 * In the case of per-cpu mmaps, we need the CPU on the
425 * AUX event. We also need the contextID in order to be notified
426 * when a context switch happened.
427 */
428 if (!perf_cpu_map__empty(cpus)) {
429 evsel__set_sample_bit(cs_etm_evsel, CPU);
430
431 err = cs_etm_set_option(itr, cs_etm_evsel,
432 BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_TS));
433 if (err)
434 goto out;
435 }
436
437 /* Add dummy event to keep tracking */
438 if (opts->full_auxtrace) {
439 struct evsel *tracking_evsel;
440
441 err = parse_event(evlist, "dummy:u");
442 if (err)
443 goto out;
444
445 tracking_evsel = evlist__last(evlist);
446 evlist__set_tracking_event(evlist, tracking_evsel);
447
448 tracking_evsel->core.attr.freq = 0;
449 tracking_evsel->core.attr.sample_period = 1;
450
451 /* In per-cpu case, always need the time of mmap events etc */
452 if (!perf_cpu_map__empty(cpus))
453 evsel__set_sample_bit(tracking_evsel, TIME);
454 }
455
456 out:
457 return err;
458 }
459
cs_etm_get_config(struct auxtrace_record * itr)460 static u64 cs_etm_get_config(struct auxtrace_record *itr)
461 {
462 u64 config = 0;
463 struct cs_etm_recording *ptr =
464 container_of(itr, struct cs_etm_recording, itr);
465 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
466 struct evlist *evlist = ptr->evlist;
467 struct evsel *evsel;
468
469 evlist__for_each_entry(evlist, evsel) {
470 if (evsel->core.attr.type == cs_etm_pmu->type) {
471 /*
472 * Variable perf_event_attr::config is assigned to
473 * ETMv3/PTM. The bit fields have been made to match
474 * the ETMv3.5 ETRMCR register specification. See the
475 * PMU_FORMAT_ATTR() declarations in
476 * drivers/hwtracing/coresight/coresight-perf.c for
477 * details.
478 */
479 config = evsel->core.attr.config;
480 break;
481 }
482 }
483
484 return config;
485 }
486
487 #ifndef BIT
488 #define BIT(N) (1UL << (N))
489 #endif
490
cs_etmv4_get_config(struct auxtrace_record * itr)491 static u64 cs_etmv4_get_config(struct auxtrace_record *itr)
492 {
493 u64 config = 0;
494 u64 config_opts = 0;
495
496 /*
497 * The perf event variable config bits represent both
498 * the command line options and register programming
499 * bits in ETMv3/PTM. For ETMv4 we must remap options
500 * to real bits
501 */
502 config_opts = cs_etm_get_config(itr);
503 if (config_opts & BIT(ETM_OPT_CYCACC))
504 config |= BIT(ETM4_CFG_BIT_CYCACC);
505 if (config_opts & BIT(ETM_OPT_CTXTID))
506 config |= BIT(ETM4_CFG_BIT_CTXTID);
507 if (config_opts & BIT(ETM_OPT_TS))
508 config |= BIT(ETM4_CFG_BIT_TS);
509 if (config_opts & BIT(ETM_OPT_RETSTK))
510 config |= BIT(ETM4_CFG_BIT_RETSTK);
511 if (config_opts & BIT(ETM_OPT_CTXTID2))
512 config |= BIT(ETM4_CFG_BIT_VMID) |
513 BIT(ETM4_CFG_BIT_VMID_OPT);
514 if (config_opts & BIT(ETM_OPT_BRANCH_BROADCAST))
515 config |= BIT(ETM4_CFG_BIT_BB);
516
517 return config;
518 }
519
520 static size_t
cs_etm_info_priv_size(struct auxtrace_record * itr __maybe_unused,struct evlist * evlist __maybe_unused)521 cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
522 struct evlist *evlist __maybe_unused)
523 {
524 int i;
525 int etmv3 = 0, etmv4 = 0, ete = 0;
526 struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus;
527 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
528
529 /* cpu map is not empty, we have specific CPUs to work with */
530 if (!perf_cpu_map__empty(event_cpus)) {
531 for (i = 0; i < cpu__max_cpu().cpu; i++) {
532 struct perf_cpu cpu = { .cpu = i, };
533
534 if (!perf_cpu_map__has(event_cpus, cpu) ||
535 !perf_cpu_map__has(online_cpus, cpu))
536 continue;
537
538 if (cs_etm_is_ete(itr, i))
539 ete++;
540 else if (cs_etm_is_etmv4(itr, i))
541 etmv4++;
542 else
543 etmv3++;
544 }
545 } else {
546 /* get configuration for all CPUs in the system */
547 for (i = 0; i < cpu__max_cpu().cpu; i++) {
548 struct perf_cpu cpu = { .cpu = i, };
549
550 if (!perf_cpu_map__has(online_cpus, cpu))
551 continue;
552
553 if (cs_etm_is_ete(itr, i))
554 ete++;
555 else if (cs_etm_is_etmv4(itr, i))
556 etmv4++;
557 else
558 etmv3++;
559 }
560 }
561
562 perf_cpu_map__put(online_cpus);
563
564 return (CS_ETM_HEADER_SIZE +
565 (ete * CS_ETE_PRIV_SIZE) +
566 (etmv4 * CS_ETMV4_PRIV_SIZE) +
567 (etmv3 * CS_ETMV3_PRIV_SIZE));
568 }
569
cs_etm_is_etmv4(struct auxtrace_record * itr,int cpu)570 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu)
571 {
572 bool ret = false;
573 char path[PATH_MAX];
574 int scan;
575 unsigned int val;
576 struct cs_etm_recording *ptr =
577 container_of(itr, struct cs_etm_recording, itr);
578 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
579
580 /* Take any of the RO files for ETMv4 and see if it present */
581 snprintf(path, PATH_MAX, "cpu%d/%s",
582 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
583 scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
584
585 /* The file was read successfully, we have a winner */
586 if (scan == 1)
587 ret = true;
588
589 return ret;
590 }
591
cs_etm_get_ro(struct perf_pmu * pmu,int cpu,const char * path)592 static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
593 {
594 char pmu_path[PATH_MAX];
595 int scan;
596 unsigned int val = 0;
597
598 /* Get RO metadata from sysfs */
599 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);
600
601 scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val);
602 if (scan != 1)
603 pr_err("%s: error reading: %s\n", __func__, pmu_path);
604
605 return val;
606 }
607
608 #define TRCDEVARCH_ARCHPART_SHIFT 0
609 #define TRCDEVARCH_ARCHPART_MASK GENMASK(11, 0)
610 #define TRCDEVARCH_ARCHPART(x) (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT)
611
612 #define TRCDEVARCH_ARCHVER_SHIFT 12
613 #define TRCDEVARCH_ARCHVER_MASK GENMASK(15, 12)
614 #define TRCDEVARCH_ARCHVER(x) (((x) & TRCDEVARCH_ARCHVER_MASK) >> TRCDEVARCH_ARCHVER_SHIFT)
615
cs_etm_is_ete(struct auxtrace_record * itr,int cpu)616 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu)
617 {
618 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
619 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
620 int trcdevarch = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETE_TRCDEVARCH]);
621
622 /*
623 * ETE if ARCHVER is 5 (ARCHVER is 4 for ETM) and ARCHPART is 0xA13.
624 * See ETM_DEVARCH_ETE_ARCH in coresight-etm4x.h
625 */
626 return TRCDEVARCH_ARCHVER(trcdevarch) == 5 && TRCDEVARCH_ARCHPART(trcdevarch) == 0xA13;
627 }
628
cs_etm_save_etmv4_header(__u64 data[],struct auxtrace_record * itr,int cpu)629 static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu)
630 {
631 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
632 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
633
634 /* Get trace configuration register */
635 data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr);
636 /* Get traceID from the framework */
637 data[CS_ETMV4_TRCTRACEIDR] = coresight_get_trace_id(cpu);
638 /* Get read-only information from sysFS */
639 data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
640 metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
641 data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu,
642 metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
643 data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu,
644 metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
645 data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu,
646 metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
647 data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu,
648 metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]);
649 }
650
cs_etm_get_metadata(int cpu,u32 * offset,struct auxtrace_record * itr,struct perf_record_auxtrace_info * info)651 static void cs_etm_get_metadata(int cpu, u32 *offset,
652 struct auxtrace_record *itr,
653 struct perf_record_auxtrace_info *info)
654 {
655 u32 increment, nr_trc_params;
656 u64 magic;
657 struct cs_etm_recording *ptr =
658 container_of(itr, struct cs_etm_recording, itr);
659 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
660
661 /* first see what kind of tracer this cpu is affined to */
662 if (cs_etm_is_ete(itr, cpu)) {
663 magic = __perf_cs_ete_magic;
664 /* ETE uses the same registers as ETMv4 plus TRCDEVARCH */
665 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
666 info->priv[*offset + CS_ETE_TRCDEVARCH] =
667 cs_etm_get_ro(cs_etm_pmu, cpu,
668 metadata_etmv4_ro[CS_ETE_TRCDEVARCH]);
669
670 /* How much space was used */
671 increment = CS_ETE_PRIV_MAX;
672 nr_trc_params = CS_ETE_PRIV_MAX - CS_ETM_COMMON_BLK_MAX_V1;
673 } else if (cs_etm_is_etmv4(itr, cpu)) {
674 magic = __perf_cs_etmv4_magic;
675 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
676
677 /* How much space was used */
678 increment = CS_ETMV4_PRIV_MAX;
679 nr_trc_params = CS_ETMV4_PRIV_MAX - CS_ETMV4_TRCCONFIGR;
680 } else {
681 magic = __perf_cs_etmv3_magic;
682 /* Get configuration register */
683 info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr);
684 /* Get traceID from the framework */
685 info->priv[*offset + CS_ETM_ETMTRACEIDR] =
686 coresight_get_trace_id(cpu);
687 /* Get read-only information from sysFS */
688 info->priv[*offset + CS_ETM_ETMCCER] =
689 cs_etm_get_ro(cs_etm_pmu, cpu,
690 metadata_etmv3_ro[CS_ETM_ETMCCER]);
691 info->priv[*offset + CS_ETM_ETMIDR] =
692 cs_etm_get_ro(cs_etm_pmu, cpu,
693 metadata_etmv3_ro[CS_ETM_ETMIDR]);
694
695 /* How much space was used */
696 increment = CS_ETM_PRIV_MAX;
697 nr_trc_params = CS_ETM_PRIV_MAX - CS_ETM_ETMCR;
698 }
699
700 /* Build generic header portion */
701 info->priv[*offset + CS_ETM_MAGIC] = magic;
702 info->priv[*offset + CS_ETM_CPU] = cpu;
703 info->priv[*offset + CS_ETM_NR_TRC_PARAMS] = nr_trc_params;
704 /* Where the next CPU entry should start from */
705 *offset += increment;
706 }
707
cs_etm_info_fill(struct auxtrace_record * itr,struct perf_session * session,struct perf_record_auxtrace_info * info,size_t priv_size)708 static int cs_etm_info_fill(struct auxtrace_record *itr,
709 struct perf_session *session,
710 struct perf_record_auxtrace_info *info,
711 size_t priv_size)
712 {
713 int i;
714 u32 offset;
715 u64 nr_cpu, type;
716 struct perf_cpu_map *cpu_map;
717 struct perf_cpu_map *event_cpus = session->evlist->core.user_requested_cpus;
718 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
719 struct cs_etm_recording *ptr =
720 container_of(itr, struct cs_etm_recording, itr);
721 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
722
723 if (priv_size != cs_etm_info_priv_size(itr, session->evlist))
724 return -EINVAL;
725
726 if (!session->evlist->core.nr_mmaps)
727 return -EINVAL;
728
729 /* If the cpu_map is empty all online CPUs are involved */
730 if (perf_cpu_map__empty(event_cpus)) {
731 cpu_map = online_cpus;
732 } else {
733 /* Make sure all specified CPUs are online */
734 for (i = 0; i < perf_cpu_map__nr(event_cpus); i++) {
735 struct perf_cpu cpu = { .cpu = i, };
736
737 if (perf_cpu_map__has(event_cpus, cpu) &&
738 !perf_cpu_map__has(online_cpus, cpu))
739 return -EINVAL;
740 }
741
742 cpu_map = event_cpus;
743 }
744
745 nr_cpu = perf_cpu_map__nr(cpu_map);
746 /* Get PMU type as dynamically assigned by the core */
747 type = cs_etm_pmu->type;
748
749 /* First fill out the session header */
750 info->type = PERF_AUXTRACE_CS_ETM;
751 info->priv[CS_HEADER_VERSION] = CS_HEADER_CURRENT_VERSION;
752 info->priv[CS_PMU_TYPE_CPUS] = type << 32;
753 info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu;
754 info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode;
755
756 offset = CS_ETM_SNAPSHOT + 1;
757
758 for (i = 0; i < cpu__max_cpu().cpu && offset < priv_size; i++) {
759 struct perf_cpu cpu = { .cpu = i, };
760
761 if (perf_cpu_map__has(cpu_map, cpu))
762 cs_etm_get_metadata(i, &offset, itr, info);
763 }
764
765 perf_cpu_map__put(online_cpus);
766
767 return 0;
768 }
769
cs_etm_snapshot_start(struct auxtrace_record * itr)770 static int cs_etm_snapshot_start(struct auxtrace_record *itr)
771 {
772 struct cs_etm_recording *ptr =
773 container_of(itr, struct cs_etm_recording, itr);
774 struct evsel *evsel;
775
776 evlist__for_each_entry(ptr->evlist, evsel) {
777 if (evsel->core.attr.type == ptr->cs_etm_pmu->type)
778 return evsel__disable(evsel);
779 }
780 return -EINVAL;
781 }
782
cs_etm_snapshot_finish(struct auxtrace_record * itr)783 static int cs_etm_snapshot_finish(struct auxtrace_record *itr)
784 {
785 struct cs_etm_recording *ptr =
786 container_of(itr, struct cs_etm_recording, itr);
787 struct evsel *evsel;
788
789 evlist__for_each_entry(ptr->evlist, evsel) {
790 if (evsel->core.attr.type == ptr->cs_etm_pmu->type)
791 return evsel__enable(evsel);
792 }
793 return -EINVAL;
794 }
795
cs_etm_reference(struct auxtrace_record * itr __maybe_unused)796 static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused)
797 {
798 return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) |
799 (((u64) rand() << 32) & 0xFFFFFFFF00000000ull);
800 }
801
cs_etm_recording_free(struct auxtrace_record * itr)802 static void cs_etm_recording_free(struct auxtrace_record *itr)
803 {
804 struct cs_etm_recording *ptr =
805 container_of(itr, struct cs_etm_recording, itr);
806
807 free(ptr);
808 }
809
cs_etm_record_init(int * err)810 struct auxtrace_record *cs_etm_record_init(int *err)
811 {
812 struct perf_pmu *cs_etm_pmu;
813 struct cs_etm_recording *ptr;
814
815 cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
816
817 if (!cs_etm_pmu) {
818 *err = -EINVAL;
819 goto out;
820 }
821
822 ptr = zalloc(sizeof(struct cs_etm_recording));
823 if (!ptr) {
824 *err = -ENOMEM;
825 goto out;
826 }
827
828 ptr->cs_etm_pmu = cs_etm_pmu;
829 ptr->itr.pmu = cs_etm_pmu;
830 ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options;
831 ptr->itr.recording_options = cs_etm_recording_options;
832 ptr->itr.info_priv_size = cs_etm_info_priv_size;
833 ptr->itr.info_fill = cs_etm_info_fill;
834 ptr->itr.snapshot_start = cs_etm_snapshot_start;
835 ptr->itr.snapshot_finish = cs_etm_snapshot_finish;
836 ptr->itr.reference = cs_etm_reference;
837 ptr->itr.free = cs_etm_recording_free;
838 ptr->itr.read_finish = auxtrace_record__read_finish;
839
840 *err = 0;
841 return &ptr->itr;
842 out:
843 return NULL;
844 }
845