Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 1 | /* |
| 2 | * intel_pt.c: Intel Processor Trace support |
| 3 | * Copyright (c) 2013-2015, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <stdbool.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/bitops.h> |
| 20 | #include <linux/log2.h> |
Adrian Hunter | 11fa7cb | 2015-07-17 19:33:54 +0300 | [diff] [blame] | 21 | #include <cpuid.h> |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 22 | |
| 23 | #include "../../perf.h" |
| 24 | #include "../../util/session.h" |
| 25 | #include "../../util/event.h" |
| 26 | #include "../../util/evlist.h" |
| 27 | #include "../../util/evsel.h" |
| 28 | #include "../../util/cpumap.h" |
Josh Poimboeuf | 4b6ab94 | 2015-12-15 09:39:39 -0600 | [diff] [blame] | 29 | #include <subcmd/parse-options.h> |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 30 | #include "../../util/parse-events.h" |
| 31 | #include "../../util/pmu.h" |
| 32 | #include "../../util/debug.h" |
| 33 | #include "../../util/auxtrace.h" |
| 34 | #include "../../util/tsc.h" |
| 35 | #include "../../util/intel-pt.h" |
| 36 | |
| 37 | #define KiB(x) ((x) * 1024) |
| 38 | #define MiB(x) ((x) * 1024 * 1024) |
| 39 | #define KiB_MASK(x) (KiB(x) - 1) |
| 40 | #define MiB_MASK(x) (MiB(x) - 1) |
| 41 | |
| 42 | #define INTEL_PT_DEFAULT_SAMPLE_SIZE KiB(4) |
| 43 | |
| 44 | #define INTEL_PT_MAX_SAMPLE_SIZE KiB(60) |
| 45 | |
| 46 | #define INTEL_PT_PSB_PERIOD_NEAR 256 |
| 47 | |
| 48 | struct intel_pt_snapshot_ref { |
| 49 | void *ref_buf; |
| 50 | size_t ref_offset; |
| 51 | bool wrapped; |
| 52 | }; |
| 53 | |
| 54 | struct intel_pt_recording { |
| 55 | struct auxtrace_record itr; |
| 56 | struct perf_pmu *intel_pt_pmu; |
| 57 | int have_sched_switch; |
| 58 | struct perf_evlist *evlist; |
| 59 | bool snapshot_mode; |
| 60 | bool snapshot_init_done; |
| 61 | size_t snapshot_size; |
| 62 | size_t snapshot_ref_buf_size; |
| 63 | int snapshot_ref_cnt; |
| 64 | struct intel_pt_snapshot_ref *snapshot_refs; |
| 65 | }; |
| 66 | |
| 67 | static int intel_pt_parse_terms_with_default(struct list_head *formats, |
| 68 | const char *str, |
| 69 | u64 *config) |
| 70 | { |
| 71 | struct list_head *terms; |
| 72 | struct perf_event_attr attr = { .size = 0, }; |
| 73 | int err; |
| 74 | |
| 75 | terms = malloc(sizeof(struct list_head)); |
| 76 | if (!terms) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | INIT_LIST_HEAD(terms); |
| 80 | |
| 81 | err = parse_events_terms(terms, str); |
| 82 | if (err) |
| 83 | goto out_free; |
| 84 | |
| 85 | attr.config = *config; |
| 86 | err = perf_pmu__config_terms(formats, &attr, terms, true, NULL); |
| 87 | if (err) |
| 88 | goto out_free; |
| 89 | |
| 90 | *config = attr.config; |
| 91 | out_free: |
Arnaldo Carvalho de Melo | 2146afc | 2016-02-12 17:09:17 -0300 | [diff] [blame] | 92 | parse_events_terms__delete(terms); |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 93 | return err; |
| 94 | } |
| 95 | |
| 96 | static int intel_pt_parse_terms(struct list_head *formats, const char *str, |
| 97 | u64 *config) |
| 98 | { |
| 99 | *config = 0; |
| 100 | return intel_pt_parse_terms_with_default(formats, str, config); |
| 101 | } |
| 102 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 103 | static u64 intel_pt_masked_bits(u64 mask, u64 bits) |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 104 | { |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 105 | const u64 top_bit = 1ULL << 63; |
| 106 | u64 res = 0; |
| 107 | int i; |
| 108 | |
| 109 | for (i = 0; i < 64; i++) { |
| 110 | if (mask & top_bit) { |
| 111 | res <<= 1; |
| 112 | if (bits & top_bit) |
| 113 | res |= 1; |
| 114 | } |
| 115 | mask <<= 1; |
| 116 | bits <<= 1; |
| 117 | } |
| 118 | |
| 119 | return res; |
| 120 | } |
| 121 | |
| 122 | static int intel_pt_read_config(struct perf_pmu *intel_pt_pmu, const char *str, |
| 123 | struct perf_evlist *evlist, u64 *res) |
| 124 | { |
| 125 | struct perf_evsel *evsel; |
| 126 | u64 mask; |
| 127 | |
| 128 | *res = 0; |
| 129 | |
| 130 | mask = perf_pmu__format_bits(&intel_pt_pmu->format, str); |
| 131 | if (!mask) |
| 132 | return -EINVAL; |
| 133 | |
Arnaldo Carvalho de Melo | e5cadb9 | 2016-06-23 11:26:15 -0300 | [diff] [blame] | 134 | evlist__for_each_entry(evlist, evsel) { |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 135 | if (evsel->attr.type == intel_pt_pmu->type) { |
| 136 | *res = intel_pt_masked_bits(mask, evsel->attr.config); |
| 137 | return 0; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | return -EINVAL; |
| 142 | } |
| 143 | |
| 144 | static size_t intel_pt_psb_period(struct perf_pmu *intel_pt_pmu, |
| 145 | struct perf_evlist *evlist) |
| 146 | { |
| 147 | u64 val; |
| 148 | int err, topa_multiple_entries; |
| 149 | size_t psb_period; |
| 150 | |
| 151 | if (perf_pmu__scan_file(intel_pt_pmu, "caps/topa_multiple_entries", |
| 152 | "%d", &topa_multiple_entries) != 1) |
| 153 | topa_multiple_entries = 0; |
| 154 | |
| 155 | /* |
| 156 | * Use caps/topa_multiple_entries to indicate early hardware that had |
| 157 | * extra frequent PSBs. |
| 158 | */ |
| 159 | if (!topa_multiple_entries) { |
| 160 | psb_period = 256; |
| 161 | goto out; |
| 162 | } |
| 163 | |
| 164 | err = intel_pt_read_config(intel_pt_pmu, "psb_period", evlist, &val); |
| 165 | if (err) |
| 166 | val = 0; |
| 167 | |
| 168 | psb_period = 1 << (val + 11); |
| 169 | out: |
| 170 | pr_debug2("%s psb_period %zu\n", intel_pt_pmu->name, psb_period); |
| 171 | return psb_period; |
| 172 | } |
| 173 | |
| 174 | static int intel_pt_pick_bit(int bits, int target) |
| 175 | { |
| 176 | int pos, pick = -1; |
| 177 | |
| 178 | for (pos = 0; bits; bits >>= 1, pos++) { |
| 179 | if (bits & 1) { |
| 180 | if (pos <= target || pick < 0) |
| 181 | pick = pos; |
| 182 | if (pos >= target) |
| 183 | break; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return pick; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu) |
| 191 | { |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 192 | char buf[256]; |
Adrian Hunter | b45fc0b | 2015-07-17 19:33:56 +0300 | [diff] [blame] | 193 | int mtc, mtc_periods = 0, mtc_period; |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 194 | int psb_cyc, psb_periods, psb_period; |
| 195 | int pos = 0; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 196 | u64 config; |
| 197 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 198 | pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc"); |
| 199 | |
Adrian Hunter | b45fc0b | 2015-07-17 19:33:56 +0300 | [diff] [blame] | 200 | if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc", "%d", |
| 201 | &mtc) != 1) |
| 202 | mtc = 1; |
| 203 | |
| 204 | if (mtc) { |
| 205 | if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc_periods", "%x", |
| 206 | &mtc_periods) != 1) |
| 207 | mtc_periods = 0; |
| 208 | if (mtc_periods) { |
| 209 | mtc_period = intel_pt_pick_bit(mtc_periods, 3); |
| 210 | pos += scnprintf(buf + pos, sizeof(buf) - pos, |
| 211 | ",mtc,mtc_period=%d", mtc_period); |
| 212 | } |
| 213 | } |
| 214 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 215 | if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_cyc", "%d", |
| 216 | &psb_cyc) != 1) |
| 217 | psb_cyc = 1; |
| 218 | |
Adrian Hunter | b45fc0b | 2015-07-17 19:33:56 +0300 | [diff] [blame] | 219 | if (psb_cyc && mtc_periods) { |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 220 | if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_periods", "%x", |
| 221 | &psb_periods) != 1) |
| 222 | psb_periods = 0; |
| 223 | if (psb_periods) { |
| 224 | psb_period = intel_pt_pick_bit(psb_periods, 3); |
| 225 | pos += scnprintf(buf + pos, sizeof(buf) - pos, |
| 226 | ",psb_period=%d", psb_period); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf); |
| 231 | |
| 232 | intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config); |
| 233 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 234 | return config; |
| 235 | } |
| 236 | |
| 237 | static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr, |
| 238 | struct record_opts *opts, |
| 239 | const char *str) |
| 240 | { |
| 241 | struct intel_pt_recording *ptr = |
| 242 | container_of(itr, struct intel_pt_recording, itr); |
| 243 | unsigned long long snapshot_size = 0; |
| 244 | char *endptr; |
| 245 | |
| 246 | if (str) { |
| 247 | snapshot_size = strtoull(str, &endptr, 0); |
| 248 | if (*endptr || snapshot_size > SIZE_MAX) |
| 249 | return -1; |
| 250 | } |
| 251 | |
| 252 | opts->auxtrace_snapshot_mode = true; |
| 253 | opts->auxtrace_snapshot_size = snapshot_size; |
| 254 | |
| 255 | ptr->snapshot_size = snapshot_size; |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | struct perf_event_attr * |
| 261 | intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu) |
| 262 | { |
| 263 | struct perf_event_attr *attr; |
| 264 | |
| 265 | attr = zalloc(sizeof(struct perf_event_attr)); |
| 266 | if (!attr) |
| 267 | return NULL; |
| 268 | |
| 269 | attr->config = intel_pt_default_config(intel_pt_pmu); |
| 270 | |
| 271 | intel_pt_pmu->selectable = true; |
| 272 | |
| 273 | return attr; |
| 274 | } |
| 275 | |
Mathieu Poirier | 14a05e1 | 2016-01-14 14:46:15 -0700 | [diff] [blame] | 276 | static size_t |
| 277 | intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused, |
| 278 | struct perf_evlist *evlist __maybe_unused) |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 279 | { |
| 280 | return INTEL_PT_AUXTRACE_PRIV_SIZE; |
| 281 | } |
| 282 | |
Adrian Hunter | 11fa7cb | 2015-07-17 19:33:54 +0300 | [diff] [blame] | 283 | static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d) |
| 284 | { |
| 285 | unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0; |
| 286 | |
| 287 | __get_cpuid(0x15, &eax, &ebx, &ecx, &edx); |
| 288 | *n = ebx; |
| 289 | *d = eax; |
| 290 | } |
| 291 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 292 | static int intel_pt_info_fill(struct auxtrace_record *itr, |
| 293 | struct perf_session *session, |
| 294 | struct auxtrace_info_event *auxtrace_info, |
| 295 | size_t priv_size) |
| 296 | { |
| 297 | struct intel_pt_recording *ptr = |
| 298 | container_of(itr, struct intel_pt_recording, itr); |
| 299 | struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu; |
| 300 | struct perf_event_mmap_page *pc; |
| 301 | struct perf_tsc_conversion tc = { .time_mult = 0, }; |
| 302 | bool cap_user_time_zero = false, per_cpu_mmaps; |
Adrian Hunter | 11fa7cb | 2015-07-17 19:33:54 +0300 | [diff] [blame] | 303 | u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit; |
| 304 | u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 305 | int err; |
| 306 | |
| 307 | if (priv_size != INTEL_PT_AUXTRACE_PRIV_SIZE) |
| 308 | return -EINVAL; |
| 309 | |
| 310 | intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit); |
| 311 | intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp", |
| 312 | &noretcomp_bit); |
Adrian Hunter | 11fa7cb | 2015-07-17 19:33:54 +0300 | [diff] [blame] | 313 | intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit); |
| 314 | mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format, |
| 315 | "mtc_period"); |
| 316 | intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit); |
| 317 | |
| 318 | intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d); |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 319 | |
| 320 | if (!session->evlist->nr_mmaps) |
| 321 | return -EINVAL; |
| 322 | |
| 323 | pc = session->evlist->mmap[0].base; |
| 324 | if (pc) { |
| 325 | err = perf_read_tsc_conversion(pc, &tc); |
| 326 | if (err) { |
| 327 | if (err != -EOPNOTSUPP) |
| 328 | return err; |
| 329 | } else { |
| 330 | cap_user_time_zero = tc.time_mult != 0; |
| 331 | } |
| 332 | if (!cap_user_time_zero) |
| 333 | ui__warning("Intel Processor Trace: TSC not available\n"); |
| 334 | } |
| 335 | |
| 336 | per_cpu_mmaps = !cpu_map__empty(session->evlist->cpus); |
| 337 | |
| 338 | auxtrace_info->type = PERF_AUXTRACE_INTEL_PT; |
| 339 | auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type; |
| 340 | auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift; |
| 341 | auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult; |
| 342 | auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero; |
| 343 | auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero; |
| 344 | auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit; |
| 345 | auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit; |
| 346 | auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch; |
| 347 | auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode; |
| 348 | auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps; |
Adrian Hunter | 11fa7cb | 2015-07-17 19:33:54 +0300 | [diff] [blame] | 349 | auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit; |
| 350 | auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits; |
| 351 | auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n; |
| 352 | auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d; |
| 353 | auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 354 | |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | static int intel_pt_track_switches(struct perf_evlist *evlist) |
| 359 | { |
| 360 | const char *sched_switch = "sched:sched_switch"; |
| 361 | struct perf_evsel *evsel; |
| 362 | int err; |
| 363 | |
| 364 | if (!perf_evlist__can_select_event(evlist, sched_switch)) |
| 365 | return -EPERM; |
| 366 | |
| 367 | err = parse_events(evlist, sched_switch, NULL); |
| 368 | if (err) { |
| 369 | pr_debug2("%s: failed to parse %s, error %d\n", |
| 370 | __func__, sched_switch, err); |
| 371 | return err; |
| 372 | } |
| 373 | |
| 374 | evsel = perf_evlist__last(evlist); |
| 375 | |
| 376 | perf_evsel__set_sample_bit(evsel, CPU); |
| 377 | perf_evsel__set_sample_bit(evsel, TIME); |
| 378 | |
| 379 | evsel->system_wide = true; |
| 380 | evsel->no_aux_samples = true; |
| 381 | evsel->immediate = true; |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 386 | static void intel_pt_valid_str(char *str, size_t len, u64 valid) |
| 387 | { |
| 388 | unsigned int val, last = 0, state = 1; |
| 389 | int p = 0; |
| 390 | |
| 391 | str[0] = '\0'; |
| 392 | |
| 393 | for (val = 0; val <= 64; val++, valid >>= 1) { |
| 394 | if (valid & 1) { |
| 395 | last = val; |
| 396 | switch (state) { |
| 397 | case 0: |
| 398 | p += scnprintf(str + p, len - p, ","); |
| 399 | /* Fall through */ |
| 400 | case 1: |
| 401 | p += scnprintf(str + p, len - p, "%u", val); |
| 402 | state = 2; |
| 403 | break; |
| 404 | case 2: |
| 405 | state = 3; |
| 406 | break; |
| 407 | case 3: |
| 408 | state = 4; |
| 409 | break; |
| 410 | default: |
| 411 | break; |
| 412 | } |
| 413 | } else { |
| 414 | switch (state) { |
| 415 | case 3: |
| 416 | p += scnprintf(str + p, len - p, ",%u", last); |
| 417 | state = 0; |
| 418 | break; |
| 419 | case 4: |
| 420 | p += scnprintf(str + p, len - p, "-%u", last); |
| 421 | state = 0; |
| 422 | break; |
| 423 | default: |
| 424 | break; |
| 425 | } |
| 426 | if (state != 1) |
| 427 | state = 0; |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu, |
| 433 | const char *caps, const char *name, |
| 434 | const char *supported, u64 config) |
| 435 | { |
| 436 | char valid_str[256]; |
| 437 | unsigned int shift; |
| 438 | unsigned long long valid; |
| 439 | u64 bits; |
| 440 | int ok; |
| 441 | |
| 442 | if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1) |
| 443 | valid = 0; |
| 444 | |
| 445 | if (supported && |
| 446 | perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok) |
| 447 | valid = 0; |
| 448 | |
| 449 | valid |= 1; |
| 450 | |
| 451 | bits = perf_pmu__format_bits(&intel_pt_pmu->format, name); |
| 452 | |
| 453 | config &= bits; |
| 454 | |
| 455 | for (shift = 0; bits && !(bits & 1); shift++) |
| 456 | bits >>= 1; |
| 457 | |
| 458 | config >>= shift; |
| 459 | |
| 460 | if (config > 63) |
| 461 | goto out_err; |
| 462 | |
| 463 | if (valid & (1 << config)) |
| 464 | return 0; |
| 465 | out_err: |
| 466 | intel_pt_valid_str(valid_str, sizeof(valid_str), valid); |
| 467 | pr_err("Invalid %s for %s. Valid values are: %s\n", |
| 468 | name, INTEL_PT_PMU_NAME, valid_str); |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | |
| 472 | static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu, |
| 473 | struct perf_evsel *evsel) |
| 474 | { |
Adrian Hunter | b45fc0b | 2015-07-17 19:33:56 +0300 | [diff] [blame] | 475 | int err; |
| 476 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 477 | if (!evsel) |
| 478 | return 0; |
| 479 | |
Adrian Hunter | 0de802a | 2015-07-17 19:33:58 +0300 | [diff] [blame] | 480 | err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds", |
| 481 | "cyc_thresh", "caps/psb_cyc", |
| 482 | evsel->attr.config); |
| 483 | if (err) |
| 484 | return err; |
| 485 | |
Adrian Hunter | b45fc0b | 2015-07-17 19:33:56 +0300 | [diff] [blame] | 486 | err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods", |
| 487 | "mtc_period", "caps/mtc", |
| 488 | evsel->attr.config); |
| 489 | if (err) |
| 490 | return err; |
| 491 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 492 | return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods", |
| 493 | "psb_period", "caps/psb_cyc", |
| 494 | evsel->attr.config); |
| 495 | } |
| 496 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 497 | static int intel_pt_recording_options(struct auxtrace_record *itr, |
| 498 | struct perf_evlist *evlist, |
| 499 | struct record_opts *opts) |
| 500 | { |
| 501 | struct intel_pt_recording *ptr = |
| 502 | container_of(itr, struct intel_pt_recording, itr); |
| 503 | struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu; |
Adrian Hunter | 3d918fb | 2016-08-15 10:23:04 +0300 | [diff] [blame] | 504 | bool have_timing_info, need_immediate = false; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 505 | struct perf_evsel *evsel, *intel_pt_evsel = NULL; |
| 506 | const struct cpu_map *cpus = evlist->cpus; |
| 507 | bool privileged = geteuid() == 0 || perf_event_paranoid() < 0; |
| 508 | u64 tsc_bit; |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 509 | int err; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 510 | |
| 511 | ptr->evlist = evlist; |
| 512 | ptr->snapshot_mode = opts->auxtrace_snapshot_mode; |
| 513 | |
Arnaldo Carvalho de Melo | e5cadb9 | 2016-06-23 11:26:15 -0300 | [diff] [blame] | 514 | evlist__for_each_entry(evlist, evsel) { |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 515 | if (evsel->attr.type == intel_pt_pmu->type) { |
| 516 | if (intel_pt_evsel) { |
| 517 | pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n"); |
| 518 | return -EINVAL; |
| 519 | } |
| 520 | evsel->attr.freq = 0; |
| 521 | evsel->attr.sample_period = 1; |
| 522 | intel_pt_evsel = evsel; |
| 523 | opts->full_auxtrace = true; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) { |
| 528 | pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n"); |
| 529 | return -EINVAL; |
| 530 | } |
| 531 | |
| 532 | if (opts->use_clockid) { |
| 533 | pr_err("Cannot use clockid (-k option) with " INTEL_PT_PMU_NAME "\n"); |
| 534 | return -EINVAL; |
| 535 | } |
| 536 | |
| 537 | if (!opts->full_auxtrace) |
| 538 | return 0; |
| 539 | |
Adrian Hunter | bc9b6bf | 2015-07-17 19:33:52 +0300 | [diff] [blame] | 540 | err = intel_pt_validate_config(intel_pt_pmu, intel_pt_evsel); |
| 541 | if (err) |
| 542 | return err; |
| 543 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 544 | /* Set default sizes for snapshot mode */ |
| 545 | if (opts->auxtrace_snapshot_mode) { |
| 546 | size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist); |
| 547 | |
| 548 | if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) { |
| 549 | if (privileged) { |
| 550 | opts->auxtrace_mmap_pages = MiB(4) / page_size; |
| 551 | } else { |
| 552 | opts->auxtrace_mmap_pages = KiB(128) / page_size; |
| 553 | if (opts->mmap_pages == UINT_MAX) |
| 554 | opts->mmap_pages = KiB(256) / page_size; |
| 555 | } |
| 556 | } else if (!opts->auxtrace_mmap_pages && !privileged && |
| 557 | opts->mmap_pages == UINT_MAX) { |
| 558 | opts->mmap_pages = KiB(256) / page_size; |
| 559 | } |
| 560 | if (!opts->auxtrace_snapshot_size) |
| 561 | opts->auxtrace_snapshot_size = |
| 562 | opts->auxtrace_mmap_pages * (size_t)page_size; |
| 563 | if (!opts->auxtrace_mmap_pages) { |
| 564 | size_t sz = opts->auxtrace_snapshot_size; |
| 565 | |
| 566 | sz = round_up(sz, page_size) / page_size; |
| 567 | opts->auxtrace_mmap_pages = roundup_pow_of_two(sz); |
| 568 | } |
| 569 | if (opts->auxtrace_snapshot_size > |
| 570 | opts->auxtrace_mmap_pages * (size_t)page_size) { |
| 571 | pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n", |
| 572 | opts->auxtrace_snapshot_size, |
| 573 | opts->auxtrace_mmap_pages * (size_t)page_size); |
| 574 | return -EINVAL; |
| 575 | } |
| 576 | if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) { |
| 577 | pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n"); |
| 578 | return -EINVAL; |
| 579 | } |
| 580 | pr_debug2("Intel PT snapshot size: %zu\n", |
| 581 | opts->auxtrace_snapshot_size); |
| 582 | if (psb_period && |
| 583 | opts->auxtrace_snapshot_size <= psb_period + |
| 584 | INTEL_PT_PSB_PERIOD_NEAR) |
| 585 | ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n", |
| 586 | opts->auxtrace_snapshot_size, psb_period); |
| 587 | } |
| 588 | |
| 589 | /* Set default sizes for full trace mode */ |
| 590 | if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) { |
| 591 | if (privileged) { |
| 592 | opts->auxtrace_mmap_pages = MiB(4) / page_size; |
| 593 | } else { |
| 594 | opts->auxtrace_mmap_pages = KiB(128) / page_size; |
| 595 | if (opts->mmap_pages == UINT_MAX) |
| 596 | opts->mmap_pages = KiB(256) / page_size; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | /* Validate auxtrace_mmap_pages */ |
| 601 | if (opts->auxtrace_mmap_pages) { |
| 602 | size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size; |
| 603 | size_t min_sz; |
| 604 | |
| 605 | if (opts->auxtrace_snapshot_mode) |
| 606 | min_sz = KiB(4); |
| 607 | else |
| 608 | min_sz = KiB(8); |
| 609 | |
| 610 | if (sz < min_sz || !is_power_of_2(sz)) { |
| 611 | pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n", |
| 612 | min_sz / 1024); |
| 613 | return -EINVAL; |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit); |
| 618 | |
| 619 | if (opts->full_auxtrace && (intel_pt_evsel->attr.config & tsc_bit)) |
| 620 | have_timing_info = true; |
| 621 | else |
| 622 | have_timing_info = false; |
| 623 | |
| 624 | /* |
| 625 | * Per-cpu recording needs sched_switch events to distinguish different |
| 626 | * threads. |
| 627 | */ |
| 628 | if (have_timing_info && !cpu_map__empty(cpus)) { |
Adrian Hunter | 86c2786 | 2015-08-13 12:40:57 +0300 | [diff] [blame] | 629 | if (perf_can_record_switch_events()) { |
| 630 | bool cpu_wide = !target__none(&opts->target) && |
| 631 | !target__has_task(&opts->target); |
| 632 | |
| 633 | if (!cpu_wide && perf_can_record_cpu_wide()) { |
| 634 | struct perf_evsel *switch_evsel; |
| 635 | |
| 636 | err = parse_events(evlist, "dummy:u", NULL); |
| 637 | if (err) |
| 638 | return err; |
| 639 | |
| 640 | switch_evsel = perf_evlist__last(evlist); |
| 641 | |
| 642 | switch_evsel->attr.freq = 0; |
| 643 | switch_evsel->attr.sample_period = 1; |
| 644 | switch_evsel->attr.context_switch = 1; |
| 645 | |
| 646 | switch_evsel->system_wide = true; |
| 647 | switch_evsel->no_aux_samples = true; |
| 648 | switch_evsel->immediate = true; |
| 649 | |
| 650 | perf_evsel__set_sample_bit(switch_evsel, TID); |
| 651 | perf_evsel__set_sample_bit(switch_evsel, TIME); |
| 652 | perf_evsel__set_sample_bit(switch_evsel, CPU); |
| 653 | |
| 654 | opts->record_switch_events = false; |
| 655 | ptr->have_sched_switch = 3; |
| 656 | } else { |
| 657 | opts->record_switch_events = true; |
Adrian Hunter | 3d918fb | 2016-08-15 10:23:04 +0300 | [diff] [blame] | 658 | need_immediate = true; |
Adrian Hunter | 86c2786 | 2015-08-13 12:40:57 +0300 | [diff] [blame] | 659 | if (cpu_wide) |
| 660 | ptr->have_sched_switch = 3; |
| 661 | else |
| 662 | ptr->have_sched_switch = 2; |
| 663 | } |
| 664 | } else { |
| 665 | err = intel_pt_track_switches(evlist); |
| 666 | if (err == -EPERM) |
| 667 | pr_debug2("Unable to select sched:sched_switch\n"); |
| 668 | else if (err) |
| 669 | return err; |
| 670 | else |
| 671 | ptr->have_sched_switch = 1; |
| 672 | } |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | if (intel_pt_evsel) { |
| 676 | /* |
| 677 | * To obtain the auxtrace buffer file descriptor, the auxtrace |
| 678 | * event must come first. |
| 679 | */ |
| 680 | perf_evlist__to_front(evlist, intel_pt_evsel); |
| 681 | /* |
| 682 | * In the case of per-cpu mmaps, we need the CPU on the |
| 683 | * AUX event. |
| 684 | */ |
| 685 | if (!cpu_map__empty(cpus)) |
| 686 | perf_evsel__set_sample_bit(intel_pt_evsel, CPU); |
| 687 | } |
| 688 | |
| 689 | /* Add dummy event to keep tracking */ |
| 690 | if (opts->full_auxtrace) { |
| 691 | struct perf_evsel *tracking_evsel; |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 692 | |
| 693 | err = parse_events(evlist, "dummy:u", NULL); |
| 694 | if (err) |
| 695 | return err; |
| 696 | |
| 697 | tracking_evsel = perf_evlist__last(evlist); |
| 698 | |
| 699 | perf_evlist__set_tracking_event(evlist, tracking_evsel); |
| 700 | |
| 701 | tracking_evsel->attr.freq = 0; |
| 702 | tracking_evsel->attr.sample_period = 1; |
| 703 | |
Adrian Hunter | 3d918fb | 2016-08-15 10:23:04 +0300 | [diff] [blame] | 704 | if (need_immediate) |
| 705 | tracking_evsel->immediate = true; |
| 706 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 707 | /* In per-cpu case, always need the time of mmap events etc */ |
Adrian Hunter | 86c2786 | 2015-08-13 12:40:57 +0300 | [diff] [blame] | 708 | if (!cpu_map__empty(cpus)) { |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 709 | perf_evsel__set_sample_bit(tracking_evsel, TIME); |
Adrian Hunter | 86c2786 | 2015-08-13 12:40:57 +0300 | [diff] [blame] | 710 | /* And the CPU for switch events */ |
| 711 | perf_evsel__set_sample_bit(tracking_evsel, CPU); |
| 712 | } |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | /* |
| 716 | * Warn the user when we do not have enough information to decode i.e. |
| 717 | * per-cpu with no sched_switch (except workload-only). |
| 718 | */ |
| 719 | if (!ptr->have_sched_switch && !cpu_map__empty(cpus) && |
| 720 | !target__none(&opts->target)) |
| 721 | ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n"); |
| 722 | |
| 723 | return 0; |
| 724 | } |
| 725 | |
| 726 | static int intel_pt_snapshot_start(struct auxtrace_record *itr) |
| 727 | { |
| 728 | struct intel_pt_recording *ptr = |
| 729 | container_of(itr, struct intel_pt_recording, itr); |
| 730 | struct perf_evsel *evsel; |
| 731 | |
Arnaldo Carvalho de Melo | e5cadb9 | 2016-06-23 11:26:15 -0300 | [diff] [blame] | 732 | evlist__for_each_entry(ptr->evlist, evsel) { |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 733 | if (evsel->attr.type == ptr->intel_pt_pmu->type) |
Jiri Olsa | d2190a8 | 2016-01-07 10:13:58 +0100 | [diff] [blame] | 734 | return perf_evsel__disable(evsel); |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 735 | } |
| 736 | return -EINVAL; |
| 737 | } |
| 738 | |
| 739 | static int intel_pt_snapshot_finish(struct auxtrace_record *itr) |
| 740 | { |
| 741 | struct intel_pt_recording *ptr = |
| 742 | container_of(itr, struct intel_pt_recording, itr); |
| 743 | struct perf_evsel *evsel; |
| 744 | |
Arnaldo Carvalho de Melo | e5cadb9 | 2016-06-23 11:26:15 -0300 | [diff] [blame] | 745 | evlist__for_each_entry(ptr->evlist, evsel) { |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 746 | if (evsel->attr.type == ptr->intel_pt_pmu->type) |
Jiri Olsa | d2190a8 | 2016-01-07 10:13:58 +0100 | [diff] [blame] | 747 | return perf_evsel__enable(evsel); |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 748 | } |
| 749 | return -EINVAL; |
| 750 | } |
| 751 | |
| 752 | static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx) |
| 753 | { |
| 754 | const size_t sz = sizeof(struct intel_pt_snapshot_ref); |
| 755 | int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2; |
| 756 | struct intel_pt_snapshot_ref *refs; |
| 757 | |
| 758 | if (!new_cnt) |
| 759 | new_cnt = 16; |
| 760 | |
| 761 | while (new_cnt <= idx) |
| 762 | new_cnt *= 2; |
| 763 | |
| 764 | refs = calloc(new_cnt, sz); |
| 765 | if (!refs) |
| 766 | return -ENOMEM; |
| 767 | |
| 768 | memcpy(refs, ptr->snapshot_refs, cnt * sz); |
| 769 | |
| 770 | ptr->snapshot_refs = refs; |
| 771 | ptr->snapshot_ref_cnt = new_cnt; |
| 772 | |
| 773 | return 0; |
| 774 | } |
| 775 | |
| 776 | static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr) |
| 777 | { |
| 778 | int i; |
| 779 | |
| 780 | for (i = 0; i < ptr->snapshot_ref_cnt; i++) |
| 781 | zfree(&ptr->snapshot_refs[i].ref_buf); |
| 782 | zfree(&ptr->snapshot_refs); |
| 783 | } |
| 784 | |
| 785 | static void intel_pt_recording_free(struct auxtrace_record *itr) |
| 786 | { |
| 787 | struct intel_pt_recording *ptr = |
| 788 | container_of(itr, struct intel_pt_recording, itr); |
| 789 | |
| 790 | intel_pt_free_snapshot_refs(ptr); |
| 791 | free(ptr); |
| 792 | } |
| 793 | |
| 794 | static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx, |
| 795 | size_t snapshot_buf_size) |
| 796 | { |
| 797 | size_t ref_buf_size = ptr->snapshot_ref_buf_size; |
| 798 | void *ref_buf; |
| 799 | |
| 800 | ref_buf = zalloc(ref_buf_size); |
| 801 | if (!ref_buf) |
| 802 | return -ENOMEM; |
| 803 | |
| 804 | ptr->snapshot_refs[idx].ref_buf = ref_buf; |
| 805 | ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size; |
| 806 | |
| 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr, |
| 811 | size_t snapshot_buf_size) |
| 812 | { |
| 813 | const size_t max_size = 256 * 1024; |
| 814 | size_t buf_size = 0, psb_period; |
| 815 | |
| 816 | if (ptr->snapshot_size <= 64 * 1024) |
| 817 | return 0; |
| 818 | |
| 819 | psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist); |
| 820 | if (psb_period) |
| 821 | buf_size = psb_period * 2; |
| 822 | |
| 823 | if (!buf_size || buf_size > max_size) |
| 824 | buf_size = max_size; |
| 825 | |
| 826 | if (buf_size >= snapshot_buf_size) |
| 827 | return 0; |
| 828 | |
| 829 | if (buf_size >= ptr->snapshot_size / 2) |
| 830 | return 0; |
| 831 | |
| 832 | return buf_size; |
| 833 | } |
| 834 | |
| 835 | static int intel_pt_snapshot_init(struct intel_pt_recording *ptr, |
| 836 | size_t snapshot_buf_size) |
| 837 | { |
| 838 | if (ptr->snapshot_init_done) |
| 839 | return 0; |
| 840 | |
| 841 | ptr->snapshot_init_done = true; |
| 842 | |
| 843 | ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr, |
| 844 | snapshot_buf_size); |
| 845 | |
| 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * intel_pt_compare_buffers - compare bytes in a buffer to a circular buffer. |
| 851 | * @buf1: first buffer |
| 852 | * @compare_size: number of bytes to compare |
| 853 | * @buf2: second buffer (a circular buffer) |
| 854 | * @offs2: offset in second buffer |
| 855 | * @buf2_size: size of second buffer |
| 856 | * |
| 857 | * The comparison allows for the possibility that the bytes to compare in the |
| 858 | * circular buffer are not contiguous. It is assumed that @compare_size <= |
| 859 | * @buf2_size. This function returns %false if the bytes are identical, %true |
| 860 | * otherwise. |
| 861 | */ |
| 862 | static bool intel_pt_compare_buffers(void *buf1, size_t compare_size, |
| 863 | void *buf2, size_t offs2, size_t buf2_size) |
| 864 | { |
| 865 | size_t end2 = offs2 + compare_size, part_size; |
| 866 | |
| 867 | if (end2 <= buf2_size) |
| 868 | return memcmp(buf1, buf2 + offs2, compare_size); |
| 869 | |
| 870 | part_size = end2 - buf2_size; |
| 871 | if (memcmp(buf1, buf2 + offs2, part_size)) |
| 872 | return true; |
| 873 | |
| 874 | compare_size -= part_size; |
| 875 | |
| 876 | return memcmp(buf1 + part_size, buf2, compare_size); |
| 877 | } |
| 878 | |
| 879 | static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset, |
| 880 | size_t ref_size, size_t buf_size, |
| 881 | void *data, size_t head) |
| 882 | { |
| 883 | size_t ref_end = ref_offset + ref_size; |
| 884 | |
| 885 | if (ref_end > buf_size) { |
| 886 | if (head > ref_offset || head < ref_end - buf_size) |
| 887 | return true; |
| 888 | } else if (head > ref_offset && head < ref_end) { |
| 889 | return true; |
| 890 | } |
| 891 | |
| 892 | return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset, |
| 893 | buf_size); |
| 894 | } |
| 895 | |
| 896 | static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size, |
| 897 | void *data, size_t head) |
| 898 | { |
| 899 | if (head >= ref_size) { |
| 900 | memcpy(ref_buf, data + head - ref_size, ref_size); |
| 901 | } else { |
| 902 | memcpy(ref_buf, data, head); |
| 903 | ref_size -= head; |
| 904 | memcpy(ref_buf + head, data + buf_size - ref_size, ref_size); |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx, |
| 909 | struct auxtrace_mmap *mm, unsigned char *data, |
| 910 | u64 head) |
| 911 | { |
| 912 | struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx]; |
| 913 | bool wrapped; |
| 914 | |
| 915 | wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset, |
| 916 | ptr->snapshot_ref_buf_size, mm->len, |
| 917 | data, head); |
| 918 | |
| 919 | intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len, |
| 920 | data, head); |
| 921 | |
| 922 | return wrapped; |
| 923 | } |
| 924 | |
| 925 | static bool intel_pt_first_wrap(u64 *data, size_t buf_size) |
| 926 | { |
| 927 | int i, a, b; |
| 928 | |
| 929 | b = buf_size >> 3; |
| 930 | a = b - 512; |
| 931 | if (a < 0) |
| 932 | a = 0; |
| 933 | |
| 934 | for (i = a; i < b; i++) { |
| 935 | if (data[i]) |
| 936 | return true; |
| 937 | } |
| 938 | |
| 939 | return false; |
| 940 | } |
| 941 | |
| 942 | static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx, |
| 943 | struct auxtrace_mmap *mm, unsigned char *data, |
| 944 | u64 *head, u64 *old) |
| 945 | { |
| 946 | struct intel_pt_recording *ptr = |
| 947 | container_of(itr, struct intel_pt_recording, itr); |
| 948 | bool wrapped; |
| 949 | int err; |
| 950 | |
| 951 | pr_debug3("%s: mmap index %d old head %zu new head %zu\n", |
| 952 | __func__, idx, (size_t)*old, (size_t)*head); |
| 953 | |
| 954 | err = intel_pt_snapshot_init(ptr, mm->len); |
| 955 | if (err) |
| 956 | goto out_err; |
| 957 | |
| 958 | if (idx >= ptr->snapshot_ref_cnt) { |
| 959 | err = intel_pt_alloc_snapshot_refs(ptr, idx); |
| 960 | if (err) |
| 961 | goto out_err; |
| 962 | } |
| 963 | |
| 964 | if (ptr->snapshot_ref_buf_size) { |
| 965 | if (!ptr->snapshot_refs[idx].ref_buf) { |
| 966 | err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len); |
| 967 | if (err) |
| 968 | goto out_err; |
| 969 | } |
| 970 | wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head); |
| 971 | } else { |
| 972 | wrapped = ptr->snapshot_refs[idx].wrapped; |
| 973 | if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) { |
| 974 | ptr->snapshot_refs[idx].wrapped = true; |
| 975 | wrapped = true; |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * In full trace mode 'head' continually increases. However in snapshot |
| 981 | * mode 'head' is an offset within the buffer. Here 'old' and 'head' |
| 982 | * are adjusted to match the full trace case which expects that 'old' is |
| 983 | * always less than 'head'. |
| 984 | */ |
| 985 | if (wrapped) { |
| 986 | *old = *head; |
| 987 | *head += mm->len; |
| 988 | } else { |
| 989 | if (mm->mask) |
| 990 | *old &= mm->mask; |
| 991 | else |
| 992 | *old %= mm->len; |
| 993 | if (*old > *head) |
| 994 | *head += mm->len; |
| 995 | } |
| 996 | |
| 997 | pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n", |
| 998 | __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head); |
| 999 | |
| 1000 | return 0; |
| 1001 | |
| 1002 | out_err: |
| 1003 | pr_err("%s: failed, error %d\n", __func__, err); |
| 1004 | return err; |
| 1005 | } |
| 1006 | |
| 1007 | static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused) |
| 1008 | { |
| 1009 | return rdtsc(); |
| 1010 | } |
| 1011 | |
| 1012 | static int intel_pt_read_finish(struct auxtrace_record *itr, int idx) |
| 1013 | { |
| 1014 | struct intel_pt_recording *ptr = |
| 1015 | container_of(itr, struct intel_pt_recording, itr); |
| 1016 | struct perf_evsel *evsel; |
| 1017 | |
Arnaldo Carvalho de Melo | e5cadb9 | 2016-06-23 11:26:15 -0300 | [diff] [blame] | 1018 | evlist__for_each_entry(ptr->evlist, evsel) { |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 1019 | if (evsel->attr.type == ptr->intel_pt_pmu->type) |
| 1020 | return perf_evlist__enable_event_idx(ptr->evlist, evsel, |
| 1021 | idx); |
| 1022 | } |
| 1023 | return -EINVAL; |
| 1024 | } |
| 1025 | |
| 1026 | struct auxtrace_record *intel_pt_recording_init(int *err) |
| 1027 | { |
| 1028 | struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME); |
| 1029 | struct intel_pt_recording *ptr; |
| 1030 | |
| 1031 | if (!intel_pt_pmu) |
| 1032 | return NULL; |
| 1033 | |
Adrian Hunter | bd0c7a5 | 2016-03-08 10:38:53 +0200 | [diff] [blame] | 1034 | if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) { |
| 1035 | *err = -errno; |
| 1036 | return NULL; |
| 1037 | } |
| 1038 | |
Adrian Hunter | 90e457f | 2015-07-17 19:33:41 +0300 | [diff] [blame] | 1039 | ptr = zalloc(sizeof(struct intel_pt_recording)); |
| 1040 | if (!ptr) { |
| 1041 | *err = -ENOMEM; |
| 1042 | return NULL; |
| 1043 | } |
| 1044 | |
| 1045 | ptr->intel_pt_pmu = intel_pt_pmu; |
| 1046 | ptr->itr.recording_options = intel_pt_recording_options; |
| 1047 | ptr->itr.info_priv_size = intel_pt_info_priv_size; |
| 1048 | ptr->itr.info_fill = intel_pt_info_fill; |
| 1049 | ptr->itr.free = intel_pt_recording_free; |
| 1050 | ptr->itr.snapshot_start = intel_pt_snapshot_start; |
| 1051 | ptr->itr.snapshot_finish = intel_pt_snapshot_finish; |
| 1052 | ptr->itr.find_snapshot = intel_pt_find_snapshot; |
| 1053 | ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options; |
| 1054 | ptr->itr.reference = intel_pt_reference; |
| 1055 | ptr->itr.read_finish = intel_pt_read_finish; |
| 1056 | return &ptr->itr; |
| 1057 | } |