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
  17 #include "tests.h"
  18
  19 #define COMP(m) do {                                    \
  20         if (s1->m != s2->m) {                           \
  21                 pr_debug("Samples differ at '"#m"'\n"); \
  22                 return false;                           \
  23         }                                               \
  24 } while (0)
  25
  26 #define MCOMP(m) do {                                   \
  27         if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) {    \
  28                 pr_debug("Samples differ at '"#m"'\n"); \
  29                 return false;                           \
  30         }                                               \
  31 } while (0)
  32
  33 static bool samples_same(const struct perf_sample *s1,
  34                          const struct perf_sample *s2,
  35                          u64 type, u64 read_format)
  36 {
  37         size_t i;
  38
  39         if (type & PERF_SAMPLE_IDENTIFIER)
  40                 COMP(id);
  41
  42         if (type & PERF_SAMPLE_IP)
  43                 COMP(ip);
  44
  45         if (type & PERF_SAMPLE_TID) {
  46                 COMP(pid);
  47                 COMP(tid);
  48         }
  49
  50         if (type & PERF_SAMPLE_TIME)
  51                 COMP(time);
  52
  53         if (type & PERF_SAMPLE_ADDR)
  54                 COMP(addr);
  55
  56         if (type & PERF_SAMPLE_ID)
  57                 COMP(id);
  58
  59         if (type & PERF_SAMPLE_STREAM_ID)
  60                 COMP(stream_id);
  61
  62         if (type & PERF_SAMPLE_CPU)
  63                 COMP(cpu);
  64
  65         if (type & PERF_SAMPLE_PERIOD)
  66                 COMP(period);
  67
  68         if (type & PERF_SAMPLE_READ) {
  69                 if (read_format & PERF_FORMAT_GROUP)
  70                         COMP(read.group.nr);
  71                 else
  72                         COMP(read.one.value);
  73                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  74                         COMP(read.time_enabled);
  75                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  76                         COMP(read.time_running);
  77                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
  78                 if (read_format & PERF_FORMAT_GROUP) {
  79                         for (i = 0; i < s1->read.group.nr; i++)
  80                                 MCOMP(read.group.values[i]);
  81                 } else {
  82                         COMP(read.one.id);
  83                 }
  84         }
  85
  86         if (type & PERF_SAMPLE_CALLCHAIN) {
  87                 COMP(callchain->nr);
  88                 for (i = 0; i < s1->callchain->nr; i++)
  89                         COMP(callchain->ips[i]);
  90         }
  91
  92         if (type & PERF_SAMPLE_RAW) {
  93                 COMP(raw_size);
  94                 if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
  95                         pr_debug("Samples differ at 'raw_data'\n");
  96                         return false;
  97                 }
  98         }
  99
 100         if (type & PERF_SAMPLE_BRANCH_STACK) {
 101                 COMP(branch_stack->nr);
 102                 COMP(branch_stack->hw_idx);
 103                 for (i = 0; i < s1->branch_stack->nr; i++)
 104                         MCOMP(branch_stack->entries[i]);
 105         }
 106
 107         if (type & PERF_SAMPLE_REGS_USER) {
 108                 size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64);
 109
 110                 COMP(user_regs.mask);
 111                 COMP(user_regs.abi);
 112                 if (s1->user_regs.abi &&
 113                     (!s1->user_regs.regs || !s2->user_regs.regs ||
 114                      memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
 115                         pr_debug("Samples differ at 'user_regs'\n");
 116                         return false;
 117                 }
 118         }
 119
 120         if (type & PERF_SAMPLE_STACK_USER) {
 121                 COMP(user_stack.size);
 122                 if (memcmp(s1->user_stack.data, s2->user_stack.data,
 123                            s1->user_stack.size)) {
 124                         pr_debug("Samples differ at 'user_stack'\n");
 125                         return false;
 126                 }
 127         }
 128
 129         if (type & PERF_SAMPLE_WEIGHT)
 130                 COMP(weight);
 131
 132         if (type & PERF_SAMPLE_DATA_SRC)
 133                 COMP(data_src);
 134
 135         if (type & PERF_SAMPLE_TRANSACTION)
 136                 COMP(transaction);
 137
 138         if (type & PERF_SAMPLE_REGS_INTR) {
 139                 size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64);
 140
 141                 COMP(intr_regs.mask);
 142                 COMP(intr_regs.abi);
 143                 if (s1->intr_regs.abi &&
 144                     (!s1->intr_regs.regs || !s2->intr_regs.regs ||
 145                      memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) {
 146                         pr_debug("Samples differ at 'intr_regs'\n");
 147                         return false;
 148                 }
 149         }
 150
 151         if (type & PERF_SAMPLE_PHYS_ADDR)
 152                 COMP(phys_addr);
 153
 154         if (type & PERF_SAMPLE_CGROUP)
 155                 COMP(cgroup);
 156
 157         if (type & PERF_SAMPLE_AUX) {
 158                 COMP(aux_sample.size);
 159                 if (memcmp(s1->aux_sample.data, s2->aux_sample.data,
 160                            s1->aux_sample.size)) {
 161                         pr_debug("Samples differ at 'aux_sample'\n");
 162                         return false;
 163                 }
 164         }
 165
 166         return true;
 167 }
 168
 169 static int do_test(u64 sample_type, u64 sample_regs, u64 read_format)
 170 {
 171         struct evsel evsel = {
 172                 .needs_swap = false,
 173                 .core = {
 174                         . attr = {
 175                                 .sample_type = sample_type,
 176                                 .read_format = read_format,
 177                         },
 178                 },
 179         };
 180         union perf_event *event;
 181         union {
 182                 struct ip_callchain callchain;
 183                 u64 data[64];
 184         } callchain = {
 185                 /* 3 ips */
 186                 .data = {3, 201, 202, 203},
 187         };
 188         union {
 189                 struct branch_stack branch_stack;
 190                 u64 data[64];
 191         } branch_stack = {
 192                 /* 1 branch_entry */
 193                 .data = {1, -1ULL, 211, 212, 213},
 194         };
 195         u64 regs[64];
 196         const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL};
 197         const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
 198         const u64 aux_data[] = {0xa55a, 0, 0xeeddee, 0x0282028202820282};
 199         struct perf_sample sample = {
 200                 .ip             = 101,
 201                 .pid            = 102,
 202                 .tid            = 103,
 203                 .time           = 104,
 204                 .addr           = 105,
 205                 .id             = 106,
 206                 .stream_id      = 107,
 207                 .period         = 108,
 208                 .weight         = 109,
 209                 .cpu            = 110,
 210                 .raw_size       = sizeof(raw_data),
 211                 .data_src       = 111,
 212                 .transaction    = 112,
 213                 .raw_data       = (void *)raw_data,
 214                 .callchain      = &callchain.callchain,
 215                 .no_hw_idx      = false,
 216                 .branch_stack   = &branch_stack.branch_stack,
 217                 .user_regs      = {
 218                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 219                         .mask   = sample_regs,
 220                         .regs   = regs,
 221                 },
 222                 .user_stack     = {
 223                         .size   = sizeof(data),
 224                         .data   = (void *)data,
 225                 },
 226                 .read           = {
 227                         .time_enabled = 0x030a59d664fca7deULL,
 228                         .time_running = 0x011b6ae553eb98edULL,
 229                 },
 230                 .intr_regs      = {
 231                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 232                         .mask   = sample_regs,
 233                         .regs   = regs,
 234                 },
 235                 .phys_addr      = 113,
 236                 .cgroup         = 114,
 237                 .aux_sample     = {
 238                         .size   = sizeof(aux_data),
 239                         .data   = (void *)aux_data,
 240                 },
 241         };
 242         struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},};
 243         struct perf_sample sample_out;
 244         size_t i, sz, bufsz;
 245         int err, ret = -1;
 246
 247         if (sample_type & PERF_SAMPLE_REGS_USER)
 248                 evsel.core.attr.sample_regs_user = sample_regs;
 249
 250         if (sample_type & PERF_SAMPLE_REGS_INTR)
 251                 evsel.core.attr.sample_regs_intr = sample_regs;
 252
 253         if (sample_type & PERF_SAMPLE_BRANCH_STACK)
 254                 evsel.core.attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX;
 255
 256         for (i = 0; i < sizeof(regs); i++)
 257                 *(i + (u8 *)regs) = i & 0xfe;
 258
 259         if (read_format & PERF_FORMAT_GROUP) {
 260                 sample.read.group.nr     = 4;
 261                 sample.read.group.values = values;
 262         } else {
 263                 sample.read.one.value = 0x08789faeb786aa87ULL;
 264                 sample.read.one.id    = 99;
 265         }
 266
 267         sz = perf_event__sample_event_size(&sample, sample_type, read_format);
 268         bufsz = sz + 4096; /* Add a bit for overrun checking */
 269         event = malloc(bufsz);
 270         if (!event) {
 271                 pr_debug("malloc failed\n");
 272                 return -1;
 273         }
 274
 275         memset(event, 0xff, bufsz);
 276         event->header.type = PERF_RECORD_SAMPLE;
 277         event->header.misc = 0;
 278         event->header.size = sz;
 279
 280         err = perf_event__synthesize_sample(event, sample_type, read_format,
 281                                             &sample);
 282         if (err) {
 283                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 284                          "perf_event__synthesize_sample", sample_type, err);
 285                 goto out_free;
 286         }
 287
 288         /* The data does not contain 0xff so we use that to check the size */
 289         for (i = bufsz; i > 0; i--) {
 290                 if (*(i - 1 + (u8 *)event) != 0xff)
 291                         break;
 292         }
 293         if (i != sz) {
 294                 pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
 295                          i, sz);
 296                 goto out_free;
 297         }
 298
 299         evsel.sample_size = __evsel__sample_size(sample_type);
 300
 301         err = evsel__parse_sample(&evsel, event, &sample_out);
 302         if (err) {
 303                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 304                          "evsel__parse_sample", sample_type, err);
 305                 goto out_free;
 306         }
 307
 308         if (!samples_same(&sample, &sample_out, sample_type, read_format)) {
 309                 pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 310                          sample_type);
 311                 goto out_free;
 312         }
 313
 314         ret = 0;
 315 out_free:
 316         free(event);
 317         if (ret && read_format)
 318                 pr_debug("read_format %#"PRIx64"\n", read_format);
 319         return ret;
 320 }
 321
 322 /**
 323  * test__sample_parsing - test sample parsing.
 324  *
 325  * This function implements a test that synthesizes a sample event, parses it
 326  * and then checks that the parsed sample matches the original sample.  The test
 327  * checks sample format bits separately and together.  If the test passes %0 is
 328  * returned, otherwise %-1 is returned.
 329  */
 330 int test__sample_parsing(struct test *test __maybe_unused, int subtest __maybe_unused)
 331 {
 332         const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15};
 333         u64 sample_type;
 334         u64 sample_regs;
 335         size_t i;
 336         int err;
 337
 338         /*
 339          * Fail the test if it has not been updated when new sample format bits
 340          * were added.  Please actually update the test rather than just change
 341          * the condition below.
 342          */
 343         if (PERF_SAMPLE_MAX > PERF_SAMPLE_CGROUP << 1) {
 344                 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
 345                 return -1;
 346         }
 347
 348         /* Test each sample format bit separately */
 349         for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
 350              sample_type <<= 1) {
 351                 /* Test read_format variations */
 352                 if (sample_type == PERF_SAMPLE_READ) {
 353                         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 354                                 err = do_test(sample_type, 0, rf[i]);
 355                                 if (err)
 356                                         return err;
 357                         }
 358                         continue;
 359                 }
 360                 sample_regs = 0;
 361
 362                 if (sample_type == PERF_SAMPLE_REGS_USER)
 363                         sample_regs = 0x3fff;
 364
 365                 if (sample_type == PERF_SAMPLE_REGS_INTR)
 366                         sample_regs = 0xff0fff;
 367
 368                 err = do_test(sample_type, sample_regs, 0);
 369                 if (err)
 370                         return err;
 371         }
 372
 373         /* Test all sample format bits together */
 374         sample_type = PERF_SAMPLE_MAX - 1;
 375         sample_regs = 0x3fff; /* shared yb intr and user regs */
 376         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 377                 err = do_test(sample_type, sample_regs, rf[i]);
 378                 if (err)
 379                         return err;
 380         }
 381
 382         return 0;
 383 }