tools/perf/tests/sample-parsing.c

   1 #include <stdbool.h>
   2 #include <inttypes.h>
   3
   4 #include "util.h"
   5 #include "event.h"
   6 #include "evsel.h"
   7
   8 #include "tests.h"
   9
  10 #define COMP(m) do {                                    \
  11         if (s1->m != s2->m) {                           \
  12                 pr_debug("Samples differ at '"#m"'\n"); \
  13                 return false;                           \
  14         }                                               \
  15 } while (0)
  16
  17 #define MCOMP(m) do {                                   \
  18         if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) {    \
  19                 pr_debug("Samples differ at '"#m"'\n"); \
  20                 return false;                           \
  21         }                                               \
  22 } while (0)
  23
  24 static bool samples_same(const struct perf_sample *s1,
  25                          const struct perf_sample *s2, u64 type, u64 regs_user,
  26                          u64 read_format)
  27 {
  28         size_t i;
  29
  30         if (type & PERF_SAMPLE_IDENTIFIER)
  31                 COMP(id);
  32
  33         if (type & PERF_SAMPLE_IP)
  34                 COMP(ip);
  35
  36         if (type & PERF_SAMPLE_TID) {
  37                 COMP(pid);
  38                 COMP(tid);
  39         }
  40
  41         if (type & PERF_SAMPLE_TIME)
  42                 COMP(time);
  43
  44         if (type & PERF_SAMPLE_ADDR)
  45                 COMP(addr);
  46
  47         if (type & PERF_SAMPLE_ID)
  48                 COMP(id);
  49
  50         if (type & PERF_SAMPLE_STREAM_ID)
  51                 COMP(stream_id);
  52
  53         if (type & PERF_SAMPLE_CPU)
  54                 COMP(cpu);
  55
  56         if (type & PERF_SAMPLE_PERIOD)
  57                 COMP(period);
  58
  59         if (type & PERF_SAMPLE_READ) {
  60                 if (read_format & PERF_FORMAT_GROUP)
  61                         COMP(read.group.nr);
  62                 else
  63                         COMP(read.one.value);
  64                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  65                         COMP(read.time_enabled);
  66                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  67                         COMP(read.time_running);
  68                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
  69                 if (read_format & PERF_FORMAT_GROUP) {
  70                         for (i = 0; i < s1->read.group.nr; i++)
  71                                 MCOMP(read.group.values[i]);
  72                 } else {
  73                         COMP(read.one.id);
  74                 }
  75         }
  76
  77         if (type & PERF_SAMPLE_CALLCHAIN) {
  78                 COMP(callchain->nr);
  79                 for (i = 0; i < s1->callchain->nr; i++)
  80                         COMP(callchain->ips[i]);
  81         }
  82
  83         if (type & PERF_SAMPLE_RAW) {
  84                 COMP(raw_size);
  85                 if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
  86                         pr_debug("Samples differ at 'raw_data'\n");
  87                         return false;
  88                 }
  89         }
  90
  91         if (type & PERF_SAMPLE_BRANCH_STACK) {
  92                 COMP(branch_stack->nr);
  93                 for (i = 0; i < s1->branch_stack->nr; i++)
  94                         MCOMP(branch_stack->entries[i]);
  95         }
  96
  97         if (type & PERF_SAMPLE_REGS_USER) {
  98                 size_t sz = hweight_long(regs_user) * sizeof(u64);
  99
 100                 COMP(user_regs.abi);
 101                 if (s1->user_regs.abi &&
 102                     (!s1->user_regs.regs || !s2->user_regs.regs ||
 103                      memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
 104                         pr_debug("Samples differ at 'user_regs'\n");
 105                         return false;
 106                 }
 107         }
 108
 109         if (type & PERF_SAMPLE_STACK_USER) {
 110                 COMP(user_stack.size);
 111                 if (memcmp(s1->user_stack.data, s1->user_stack.data,
 112                            s1->user_stack.size)) {
 113                         pr_debug("Samples differ at 'user_stack'\n");
 114                         return false;
 115                 }
 116         }
 117
 118         if (type & PERF_SAMPLE_WEIGHT)
 119                 COMP(weight);
 120
 121         if (type & PERF_SAMPLE_DATA_SRC)
 122                 COMP(data_src);
 123
 124         return true;
 125 }
 126
 127 static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format)
 128 {
 129         struct perf_evsel evsel = {
 130                 .needs_swap = false,
 131                 .attr = {
 132                         .sample_type = sample_type,
 133                         .sample_regs_user = sample_regs_user,
 134                         .read_format = read_format,
 135                 },
 136         };
 137         union perf_event *event;
 138         union {
 139                 struct ip_callchain callchain;
 140                 u64 data[64];
 141         } callchain = {
 142                 /* 3 ips */
 143                 .data = {3, 201, 202, 203},
 144         };
 145         union {
 146                 struct branch_stack branch_stack;
 147                 u64 data[64];
 148         } branch_stack = {
 149                 /* 1 branch_entry */
 150                 .data = {1, 211, 212, 213},
 151         };
 152         u64 user_regs[64];
 153         const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL};
 154         const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
 155         struct perf_sample sample = {
 156                 .ip             = 101,
 157                 .pid            = 102,
 158                 .tid            = 103,
 159                 .time           = 104,
 160                 .addr           = 105,
 161                 .id             = 106,
 162                 .stream_id      = 107,
 163                 .period         = 108,
 164                 .weight         = 109,
 165                 .cpu            = 110,
 166                 .raw_size       = sizeof(raw_data),
 167                 .data_src       = 111,
 168                 .raw_data       = (void *)raw_data,
 169                 .callchain      = &callchain.callchain,
 170                 .branch_stack   = &branch_stack.branch_stack,
 171                 .user_regs      = {
 172                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 173                         .regs   = user_regs,
 174                 },
 175                 .user_stack     = {
 176                         .size   = sizeof(data),
 177                         .data   = (void *)data,
 178                 },
 179                 .read           = {
 180                         .time_enabled = 0x030a59d664fca7deULL,
 181                         .time_running = 0x011b6ae553eb98edULL,
 182                 },
 183         };
 184         struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},};
 185         struct perf_sample sample_out;
 186         size_t i, sz, bufsz;
 187         int err, ret = -1;
 188
 189         for (i = 0; i < sizeof(user_regs); i++)
 190                 *(i + (u8 *)user_regs) = i & 0xfe;
 191
 192         if (read_format & PERF_FORMAT_GROUP) {
 193                 sample.read.group.nr     = 4;
 194                 sample.read.group.values = values;
 195         } else {
 196                 sample.read.one.value = 0x08789faeb786aa87ULL;
 197                 sample.read.one.id    = 99;
 198         }
 199
 200         sz = perf_event__sample_event_size(&sample, sample_type,
 201                                            sample_regs_user, read_format);
 202         bufsz = sz + 4096; /* Add a bit for overrun checking */
 203         event = malloc(bufsz);
 204         if (!event) {
 205                 pr_debug("malloc failed\n");
 206                 return -1;
 207         }
 208
 209         memset(event, 0xff, bufsz);
 210         event->header.type = PERF_RECORD_SAMPLE;
 211         event->header.misc = 0;
 212         event->header.size = sz;
 213
 214         err = perf_event__synthesize_sample(event, sample_type,
 215                                             sample_regs_user, read_format,
 216                                             &sample, false);
 217         if (err) {
 218                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 219                          "perf_event__synthesize_sample", sample_type, err);
 220                 goto out_free;
 221         }
 222
 223         /* The data does not contain 0xff so we use that to check the size */
 224         for (i = bufsz; i > 0; i--) {
 225                 if (*(i - 1 + (u8 *)event) != 0xff)
 226                         break;
 227         }
 228         if (i != sz) {
 229                 pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
 230                          i, sz);
 231                 goto out_free;
 232         }
 233
 234         evsel.sample_size = __perf_evsel__sample_size(sample_type);
 235
 236         err = perf_evsel__parse_sample(&evsel, event, &sample_out);
 237         if (err) {
 238                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 239                          "perf_evsel__parse_sample", sample_type, err);
 240                 goto out_free;
 241         }
 242
 243         if (!samples_same(&sample, &sample_out, sample_type,
 244                           sample_regs_user, read_format)) {
 245                 pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 246                          sample_type);
 247                 goto out_free;
 248         }
 249
 250         ret = 0;
 251 out_free:
 252         free(event);
 253         if (ret && read_format)
 254                 pr_debug("read_format %#"PRIx64"\n", read_format);
 255         return ret;
 256 }
 257
 258 /**
 259  * test__sample_parsing - test sample parsing.
 260  *
 261  * This function implements a test that synthesizes a sample event, parses it
 262  * and then checks that the parsed sample matches the original sample.  The test
 263  * checks sample format bits separately and together.  If the test passes %0 is
 264  * returned, otherwise %-1 is returned.
 265  */
 266 int test__sample_parsing(void)
 267 {
 268         const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15};
 269         u64 sample_type;
 270         u64 sample_regs_user;
 271         size_t i;
 272         int err;
 273
 274         /*
 275          * Fail the test if it has not been updated when new sample format bits
 276          * were added.
 277          */
 278         if (PERF_SAMPLE_MAX > PERF_SAMPLE_IDENTIFIER << 1) {
 279                 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
 280                 return -1;
 281         }
 282
 283         /* Test each sample format bit separately */
 284         for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
 285              sample_type <<= 1) {
 286                 /* Test read_format variations */
 287                 if (sample_type == PERF_SAMPLE_READ) {
 288                         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 289                                 err = do_test(sample_type, 0, rf[i]);
 290                                 if (err)
 291                                         return err;
 292                         }
 293                         continue;
 294                 }
 295
 296                 if (sample_type == PERF_SAMPLE_REGS_USER)
 297                         sample_regs_user = 0x3fff;
 298                 else
 299                         sample_regs_user = 0;
 300
 301                 err = do_test(sample_type, sample_regs_user, 0);
 302                 if (err)
 303                         return err;
 304         }
 305
 306         /* Test all sample format bits together */
 307         sample_type = PERF_SAMPLE_MAX - 1;
 308         sample_regs_user = 0x3fff;
 309         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 310                 err = do_test(sample_type, sample_regs_user, rf[i]);
 311                 if (err)
 312                         return err;
 313         }
 314
 315         return 0;
 316 }