tools/perf/tests/sample-parsing.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdbool.h>
   3 #include <inttypes.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <linux/bitops.h>
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9
  10 #include "map_symbol.h"
  11 #include "branch.h"
  12 #include "event.h"
  13 #include "evsel.h"
  14 #include "debug.h"
  15 #include "util/synthetic-events.h"
  16 #include "util/util.h"
  17
  18 #include "tests.h"
  19
  20 #define COMP(m) do {                                    \
  21         if (s1->m != s2->m) {                           \
  22                 pr_debug("Samples differ at '"#m"'\n"); \
  23                 return false;                           \
  24         }                                               \
  25 } while (0)
  26
  27 #define MCOMP(m) do {                                   \
  28         if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) {    \
  29                 pr_debug("Samples differ at '"#m"'\n"); \
  30                 return false;                           \
  31         }                                               \
  32 } while (0)
  33
  34 /*
  35  * Hardcode the expected values for branch_entry flags.
  36  * These are based on the input value (213) specified
  37  * in branch_stack variable.
  38  */
  39 #define BS_EXPECTED_BE  0xa000d00000000000
  40 #define BS_EXPECTED_LE  0x1aa00000000
  41 #define FLAG(s) s->branch_stack->entries[i].flags
  42
  43 static bool samples_same(const struct perf_sample *s1,
  44                          const struct perf_sample *s2,
  45                          u64 type, u64 read_format, bool needs_swap)
  46 {
  47         size_t i;
  48
  49         if (type & PERF_SAMPLE_IDENTIFIER)
  50                 COMP(id);
  51
  52         if (type & PERF_SAMPLE_IP)
  53                 COMP(ip);
  54
  55         if (type & PERF_SAMPLE_TID) {
  56                 COMP(pid);
  57                 COMP(tid);
  58         }
  59
  60         if (type & PERF_SAMPLE_TIME)
  61                 COMP(time);
  62
  63         if (type & PERF_SAMPLE_ADDR)
  64                 COMP(addr);
  65
  66         if (type & PERF_SAMPLE_ID)
  67                 COMP(id);
  68
  69         if (type & PERF_SAMPLE_STREAM_ID)
  70                 COMP(stream_id);
  71
  72         if (type & PERF_SAMPLE_CPU)
  73                 COMP(cpu);
  74
  75         if (type & PERF_SAMPLE_PERIOD)
  76                 COMP(period);
  77
  78         if (type & PERF_SAMPLE_READ) {
  79                 if (read_format & PERF_FORMAT_GROUP)
  80                         COMP(read.group.nr);
  81                 else
  82                         COMP(read.one.value);
  83                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  84                         COMP(read.time_enabled);
  85                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  86                         COMP(read.time_running);
  87                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
  88                 if (read_format & PERF_FORMAT_GROUP) {
  89                         for (i = 0; i < s1->read.group.nr; i++) {
  90                                 /* FIXME: check values without LOST */
  91                                 if (read_format & PERF_FORMAT_LOST)
  92                                         MCOMP(read.group.values[i]);
  93                         }
  94                 } else {
  95                         COMP(read.one.id);
  96                         if (read_format & PERF_FORMAT_LOST)
  97                                 COMP(read.one.lost);
  98                 }
  99         }
 100
 101         if (type & PERF_SAMPLE_CALLCHAIN) {
 102                 COMP(callchain->nr);
 103                 for (i = 0; i < s1->callchain->nr; i++)
 104                         COMP(callchain->ips[i]);
 105         }
 106
 107         if (type & PERF_SAMPLE_RAW) {
 108                 COMP(raw_size);
 109                 if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
 110                         pr_debug("Samples differ at 'raw_data'\n");
 111                         return false;
 112                 }
 113         }
 114
 115         if (type & PERF_SAMPLE_BRANCH_STACK) {
 116                 COMP(branch_stack->nr);
 117                 COMP(branch_stack->hw_idx);
 118                 for (i = 0; i < s1->branch_stack->nr; i++) {
 119                         if (needs_swap)
 120                                 return ((host_is_bigendian()) ?
 121                                         (FLAG(s2).value == BS_EXPECTED_BE) :
 122                                         (FLAG(s2).value == BS_EXPECTED_LE));
 123                         else
 124                                 MCOMP(branch_stack->entries[i]);
 125                 }
 126         }
 127
 128         if (type & PERF_SAMPLE_REGS_USER) {
 129                 size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64);
 130
 131                 COMP(user_regs.mask);
 132                 COMP(user_regs.abi);
 133                 if (s1->user_regs.abi &&
 134                     (!s1->user_regs.regs || !s2->user_regs.regs ||
 135                      memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
 136                         pr_debug("Samples differ at 'user_regs'\n");
 137                         return false;
 138                 }
 139         }
 140
 141         if (type & PERF_SAMPLE_STACK_USER) {
 142                 COMP(user_stack.size);
 143                 if (memcmp(s1->user_stack.data, s2->user_stack.data,
 144                            s1->user_stack.size)) {
 145                         pr_debug("Samples differ at 'user_stack'\n");
 146                         return false;
 147                 }
 148         }
 149
 150         if (type & PERF_SAMPLE_WEIGHT)
 151                 COMP(weight);
 152
 153         if (type & PERF_SAMPLE_DATA_SRC)
 154                 COMP(data_src);
 155
 156         if (type & PERF_SAMPLE_TRANSACTION)
 157                 COMP(transaction);
 158
 159         if (type & PERF_SAMPLE_REGS_INTR) {
 160                 size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64);
 161
 162                 COMP(intr_regs.mask);
 163                 COMP(intr_regs.abi);
 164                 if (s1->intr_regs.abi &&
 165                     (!s1->intr_regs.regs || !s2->intr_regs.regs ||
 166                      memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) {
 167                         pr_debug("Samples differ at 'intr_regs'\n");
 168                         return false;
 169                 }
 170         }
 171
 172         if (type & PERF_SAMPLE_PHYS_ADDR)
 173                 COMP(phys_addr);
 174
 175         if (type & PERF_SAMPLE_CGROUP)
 176                 COMP(cgroup);
 177
 178         if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
 179                 COMP(data_page_size);
 180
 181         if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
 182                 COMP(code_page_size);
 183
 184         if (type & PERF_SAMPLE_AUX) {
 185                 COMP(aux_sample.size);
 186                 if (memcmp(s1->aux_sample.data, s2->aux_sample.data,
 187                            s1->aux_sample.size)) {
 188                         pr_debug("Samples differ at 'aux_sample'\n");
 189                         return false;
 190                 }
 191         }
 192
 193         return true;
 194 }
 195
 196 static int do_test(u64 sample_type, u64 sample_regs, u64 read_format)
 197 {
 198         struct evsel evsel = {
 199                 .needs_swap = false,
 200                 .core = {
 201                         . attr = {
 202                                 .sample_type = sample_type,
 203                                 .read_format = read_format,
 204                         },
 205                 },
 206         };
 207         union perf_event *event;
 208         union {
 209                 struct ip_callchain callchain;
 210                 u64 data[64];
 211         } callchain = {
 212                 /* 3 ips */
 213                 .data = {3, 201, 202, 203},
 214         };
 215         union {
 216                 struct branch_stack branch_stack;
 217                 u64 data[64];
 218         } branch_stack = {
 219                 /* 1 branch_entry */
 220                 .data = {1, -1ULL, 211, 212, 213},
 221         };
 222         u64 regs[64];
 223         const u32 raw_data[] = {0x12345678, 0x0a0b0c0d, 0x11020304, 0x05060708, 0 };
 224         const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
 225         const u64 aux_data[] = {0xa55a, 0, 0xeeddee, 0x0282028202820282};
 226         struct perf_sample sample = {
 227                 .ip             = 101,
 228                 .pid            = 102,
 229                 .tid            = 103,
 230                 .time           = 104,
 231                 .addr           = 105,
 232                 .id             = 106,
 233                 .stream_id      = 107,
 234                 .period         = 108,
 235                 .weight         = 109,
 236                 .cpu            = 110,
 237                 .raw_size       = sizeof(raw_data),
 238                 .data_src       = 111,
 239                 .transaction    = 112,
 240                 .raw_data       = (void *)raw_data,
 241                 .callchain      = &callchain.callchain,
 242                 .no_hw_idx      = false,
 243                 .branch_stack   = &branch_stack.branch_stack,
 244                 .user_regs      = {
 245                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 246                         .mask   = sample_regs,
 247                         .regs   = regs,
 248                 },
 249                 .user_stack     = {
 250                         .size   = sizeof(data),
 251                         .data   = (void *)data,
 252                 },
 253                 .read           = {
 254                         .time_enabled = 0x030a59d664fca7deULL,
 255                         .time_running = 0x011b6ae553eb98edULL,
 256                 },
 257                 .intr_regs      = {
 258                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 259                         .mask   = sample_regs,
 260                         .regs   = regs,
 261                 },
 262                 .phys_addr      = 113,
 263                 .cgroup         = 114,
 264                 .data_page_size = 115,
 265                 .code_page_size = 116,
 266                 .aux_sample     = {
 267                         .size   = sizeof(aux_data),
 268                         .data   = (void *)aux_data,
 269                 },
 270         };
 271         struct sample_read_value values[] = {{1, 5, 0}, {9, 3, 0}, {2, 7, 0}, {6, 4, 1},};
 272         struct perf_sample sample_out, sample_out_endian;
 273         size_t i, sz, bufsz;
 274         int err, ret = -1;
 275
 276         if (sample_type & PERF_SAMPLE_REGS_USER)
 277                 evsel.core.attr.sample_regs_user = sample_regs;
 278
 279         if (sample_type & PERF_SAMPLE_REGS_INTR)
 280                 evsel.core.attr.sample_regs_intr = sample_regs;
 281
 282         if (sample_type & PERF_SAMPLE_BRANCH_STACK)
 283                 evsel.core.attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX;
 284
 285         for (i = 0; i < sizeof(regs); i++)
 286                 *(i + (u8 *)regs) = i & 0xfe;
 287
 288         if (read_format & PERF_FORMAT_GROUP) {
 289                 sample.read.group.nr     = 4;
 290                 sample.read.group.values = values;
 291         } else {
 292                 sample.read.one.value = 0x08789faeb786aa87ULL;
 293                 sample.read.one.id    = 99;
 294                 sample.read.one.lost  = 1;
 295         }
 296
 297         sz = perf_event__sample_event_size(&sample, sample_type, read_format);
 298         bufsz = sz + 4096; /* Add a bit for overrun checking */
 299         event = malloc(bufsz);
 300         if (!event) {
 301                 pr_debug("malloc failed\n");
 302                 return -1;
 303         }
 304
 305         memset(event, 0xff, bufsz);
 306         event->header.type = PERF_RECORD_SAMPLE;
 307         event->header.misc = 0;
 308         event->header.size = sz;
 309
 310         err = perf_event__synthesize_sample(event, sample_type, read_format,
 311                                             &sample);
 312         if (err) {
 313                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 314                          "perf_event__synthesize_sample", sample_type, err);
 315                 goto out_free;
 316         }
 317
 318         /* The data does not contain 0xff so we use that to check the size */
 319         for (i = bufsz; i > 0; i--) {
 320                 if (*(i - 1 + (u8 *)event) != 0xff)
 321                         break;
 322         }
 323         if (i != sz) {
 324                 pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
 325                          i, sz);
 326                 goto out_free;
 327         }
 328
 329         evsel.sample_size = __evsel__sample_size(sample_type);
 330
 331         err = evsel__parse_sample(&evsel, event, &sample_out);
 332         if (err) {
 333                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 334                          "evsel__parse_sample", sample_type, err);
 335                 goto out_free;
 336         }
 337
 338         if (!samples_same(&sample, &sample_out, sample_type, read_format, evsel.needs_swap)) {
 339                 pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 340                          sample_type);
 341                 goto out_free;
 342         }
 343
 344         if (sample_type == PERF_SAMPLE_BRANCH_STACK) {
 345                 evsel.needs_swap = true;
 346                 evsel.sample_size = __evsel__sample_size(sample_type);
 347                 err = evsel__parse_sample(&evsel, event, &sample_out_endian);
 348                 if (err) {
 349                         pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 350                                  "evsel__parse_sample", sample_type, err);
 351                         goto out_free;
 352                 }
 353
 354                 if (!samples_same(&sample, &sample_out_endian, sample_type, read_format, evsel.needs_swap)) {
 355                         pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 356                                  sample_type);
 357                         goto out_free;
 358                 }
 359         }
 360
 361         ret = 0;
 362 out_free:
 363         free(event);
 364         if (ret && read_format)
 365                 pr_debug("read_format %#"PRIx64"\n", read_format);
 366         return ret;
 367 }
 368
 369 /**
 370  * test__sample_parsing - test sample parsing.
 371  *
 372  * This function implements a test that synthesizes a sample event, parses it
 373  * and then checks that the parsed sample matches the original sample.  The test
 374  * checks sample format bits separately and together.  If the test passes %0 is
 375  * returned, otherwise %-1 is returned.
 376  */
 377 static int test__sample_parsing(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 378 {
 379         const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15, 20, 21, 22, 28, 29, 30, 31};
 380         u64 sample_type;
 381         u64 sample_regs;
 382         size_t i;
 383         int err;
 384
 385         /*
 386          * Fail the test if it has not been updated when new sample format bits
 387          * were added.  Please actually update the test rather than just change
 388          * the condition below.
 389          */
 390         if (PERF_SAMPLE_MAX > PERF_SAMPLE_WEIGHT_STRUCT << 1) {
 391                 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
 392                 return -1;
 393         }
 394
 395         /* Test each sample format bit separately */
 396         for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
 397              sample_type <<= 1) {
 398                 /* Test read_format variations */
 399                 if (sample_type == PERF_SAMPLE_READ) {
 400                         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 401                                 err = do_test(sample_type, 0, rf[i]);
 402                                 if (err)
 403                                         return err;
 404                         }
 405                         continue;
 406                 }
 407                 sample_regs = 0;
 408
 409                 if (sample_type == PERF_SAMPLE_REGS_USER)
 410                         sample_regs = 0x3fff;
 411
 412                 if (sample_type == PERF_SAMPLE_REGS_INTR)
 413                         sample_regs = 0xff0fff;
 414
 415                 err = do_test(sample_type, sample_regs, 0);
 416                 if (err)
 417                         return err;
 418         }
 419
 420         /*
 421          * Test all sample format bits together
 422          * Note: PERF_SAMPLE_WEIGHT and PERF_SAMPLE_WEIGHT_STRUCT cannot
 423          *       be set simultaneously.
 424          */
 425         sample_type = (PERF_SAMPLE_MAX - 1) & ~PERF_SAMPLE_WEIGHT;
 426         sample_regs = 0x3fff; /* shared yb intr and user regs */
 427         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 428                 err = do_test(sample_type, sample_regs, rf[i]);
 429                 if (err)
 430                         return err;
 431         }
 432
 433         return 0;
 434 }
 435
 436 DEFINE_SUITE("Sample parsing", sample_parsing);