kernel/tools/perf/tests/sample-parsing.c

   1 #include <stdbool.h>
   2 #include <linux/types.h>
   3
   4 #include "util.h"
   5 #include "event.h"
   6 #include "evsel.h"
   7 #include "debug.h"
   8
   9 #include "tests.h"
  10
  11 #define COMP(m) do {                                    \
  12         if (s1->m != s2->m) {                           \
  13                 pr_debug("Samples differ at '"#m"'\n"); \
  14                 return false;                           \
  15         }                                               \
  16 } while (0)
  17
  18 #define MCOMP(m) do {                                   \
  19         if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) {    \
  20                 pr_debug("Samples differ at '"#m"'\n"); \
  21                 return false;                           \
  22         }                                               \
  23 } while (0)
  24
  25 static bool samples_same(const struct perf_sample *s1,
  26                          const struct perf_sample *s2,
  27                          u64 type, u64 read_format)
  28 {
  29         size_t i;
  30
  31         if (type & PERF_SAMPLE_IDENTIFIER)
  32                 COMP(id);
  33
  34         if (type & PERF_SAMPLE_IP)
  35                 COMP(ip);
  36
  37         if (type & PERF_SAMPLE_TID) {
  38                 COMP(pid);
  39                 COMP(tid);
  40         }
  41
  42         if (type & PERF_SAMPLE_TIME)
  43                 COMP(time);
  44
  45         if (type & PERF_SAMPLE_ADDR)
  46                 COMP(addr);
  47
  48         if (type & PERF_SAMPLE_ID)
  49                 COMP(id);
  50
  51         if (type & PERF_SAMPLE_STREAM_ID)
  52                 COMP(stream_id);
  53
  54         if (type & PERF_SAMPLE_CPU)
  55                 COMP(cpu);
  56
  57         if (type & PERF_SAMPLE_PERIOD)
  58                 COMP(period);
  59
  60         if (type & PERF_SAMPLE_READ) {
  61                 if (read_format & PERF_FORMAT_GROUP)
  62                         COMP(read.group.nr);
  63                 else
  64                         COMP(read.one.value);
  65                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  66                         COMP(read.time_enabled);
  67                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  68                         COMP(read.time_running);
  69                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
  70                 if (read_format & PERF_FORMAT_GROUP) {
  71                         for (i = 0; i < s1->read.group.nr; i++)
  72                                 MCOMP(read.group.values[i]);
  73                 } else {
  74                         COMP(read.one.id);
  75                 }
  76         }
  77
  78         if (type & PERF_SAMPLE_CALLCHAIN) {
  79                 COMP(callchain->nr);
  80                 for (i = 0; i < s1->callchain->nr; i++)
  81                         COMP(callchain->ips[i]);
  82         }
  83
  84         if (type & PERF_SAMPLE_RAW) {
  85                 COMP(raw_size);
  86                 if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
  87                         pr_debug("Samples differ at 'raw_data'\n");
  88                         return false;
  89                 }
  90         }
  91
  92         if (type & PERF_SAMPLE_BRANCH_STACK) {
  93                 COMP(branch_stack->nr);
  94                 for (i = 0; i < s1->branch_stack->nr; i++)
  95                         MCOMP(branch_stack->entries[i]);
  96         }
  97
  98         if (type & PERF_SAMPLE_REGS_USER) {
  99                 size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64);
 100
 101                 COMP(user_regs.mask);
 102                 COMP(user_regs.abi);
 103                 if (s1->user_regs.abi &&
 104                     (!s1->user_regs.regs || !s2->user_regs.regs ||
 105                      memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
 106                         pr_debug("Samples differ at 'user_regs'\n");
 107                         return false;
 108                 }
 109         }
 110
 111         if (type & PERF_SAMPLE_STACK_USER) {
 112                 COMP(user_stack.size);
 113                 if (memcmp(s1->user_stack.data, s2->user_stack.data,
 114                            s1->user_stack.size)) {
 115                         pr_debug("Samples differ at 'user_stack'\n");
 116                         return false;
 117                 }
 118         }
 119
 120         if (type & PERF_SAMPLE_WEIGHT)
 121                 COMP(weight);
 122
 123         if (type & PERF_SAMPLE_DATA_SRC)
 124                 COMP(data_src);
 125
 126         if (type & PERF_SAMPLE_TRANSACTION)
 127                 COMP(transaction);
 128
 129         if (type & PERF_SAMPLE_REGS_INTR) {
 130                 size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64);
 131
 132                 COMP(intr_regs.mask);
 133                 COMP(intr_regs.abi);
 134                 if (s1->intr_regs.abi &&
 135                     (!s1->intr_regs.regs || !s2->intr_regs.regs ||
 136                      memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) {
 137                         pr_debug("Samples differ at 'intr_regs'\n");
 138                         return false;
 139                 }
 140         }
 141
 142         return true;
 143 }
 144
 145 static int do_test(u64 sample_type, u64 sample_regs, u64 read_format)
 146 {
 147         struct perf_evsel evsel = {
 148                 .needs_swap = false,
 149                 .attr = {
 150                         .sample_type = sample_type,
 151                         .read_format = read_format,
 152                 },
 153         };
 154         union perf_event *event;
 155         union {
 156                 struct ip_callchain callchain;
 157                 u64 data[64];
 158         } callchain = {
 159                 /* 3 ips */
 160                 .data = {3, 201, 202, 203},
 161         };
 162         union {
 163                 struct branch_stack branch_stack;
 164                 u64 data[64];
 165         } branch_stack = {
 166                 /* 1 branch_entry */
 167                 .data = {1, 211, 212, 213},
 168         };
 169         u64 regs[64];
 170         const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL};
 171         const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
 172         struct perf_sample sample = {
 173                 .ip             = 101,
 174                 .pid            = 102,
 175                 .tid            = 103,
 176                 .time           = 104,
 177                 .addr           = 105,
 178                 .id             = 106,
 179                 .stream_id      = 107,
 180                 .period         = 108,
 181                 .weight         = 109,
 182                 .cpu            = 110,
 183                 .raw_size       = sizeof(raw_data),
 184                 .data_src       = 111,
 185                 .transaction    = 112,
 186                 .raw_data       = (void *)raw_data,
 187                 .callchain      = &callchain.callchain,
 188                 .branch_stack   = &branch_stack.branch_stack,
 189                 .user_regs      = {
 190                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 191                         .mask   = sample_regs,
 192                         .regs   = regs,
 193                 },
 194                 .user_stack     = {
 195                         .size   = sizeof(data),
 196                         .data   = (void *)data,
 197                 },
 198                 .read           = {
 199                         .time_enabled = 0x030a59d664fca7deULL,
 200                         .time_running = 0x011b6ae553eb98edULL,
 201                 },
 202                 .intr_regs      = {
 203                         .abi    = PERF_SAMPLE_REGS_ABI_64,
 204                         .mask   = sample_regs,
 205                         .regs   = regs,
 206                 },
 207         };
 208         struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},};
 209         struct perf_sample sample_out;
 210         size_t i, sz, bufsz;
 211         int err, ret = -1;
 212
 213         if (sample_type & PERF_SAMPLE_REGS_USER)
 214                 evsel.attr.sample_regs_user = sample_regs;
 215
 216         if (sample_type & PERF_SAMPLE_REGS_INTR)
 217                 evsel.attr.sample_regs_intr = sample_regs;
 218
 219         for (i = 0; i < sizeof(regs); i++)
 220                 *(i + (u8 *)regs) = i & 0xfe;
 221
 222         if (read_format & PERF_FORMAT_GROUP) {
 223                 sample.read.group.nr     = 4;
 224                 sample.read.group.values = values;
 225         } else {
 226                 sample.read.one.value = 0x08789faeb786aa87ULL;
 227                 sample.read.one.id    = 99;
 228         }
 229
 230         sz = perf_event__sample_event_size(&sample, sample_type, read_format);
 231         bufsz = sz + 4096; /* Add a bit for overrun checking */
 232         event = malloc(bufsz);
 233         if (!event) {
 234                 pr_debug("malloc failed\n");
 235                 return -1;
 236         }
 237
 238         memset(event, 0xff, bufsz);
 239         event->header.type = PERF_RECORD_SAMPLE;
 240         event->header.misc = 0;
 241         event->header.size = sz;
 242
 243         err = perf_event__synthesize_sample(event, sample_type, read_format,
 244                                             &sample, false);
 245         if (err) {
 246                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 247                          "perf_event__synthesize_sample", sample_type, err);
 248                 goto out_free;
 249         }
 250
 251         /* The data does not contain 0xff so we use that to check the size */
 252         for (i = bufsz; i > 0; i--) {
 253                 if (*(i - 1 + (u8 *)event) != 0xff)
 254                         break;
 255         }
 256         if (i != sz) {
 257                 pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
 258                          i, sz);
 259                 goto out_free;
 260         }
 261
 262         evsel.sample_size = __perf_evsel__sample_size(sample_type);
 263
 264         err = perf_evsel__parse_sample(&evsel, event, &sample_out);
 265         if (err) {
 266                 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 267                          "perf_evsel__parse_sample", sample_type, err);
 268                 goto out_free;
 269         }
 270
 271         if (!samples_same(&sample, &sample_out, sample_type, read_format)) {
 272                 pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 273                          sample_type);
 274                 goto out_free;
 275         }
 276
 277         ret = 0;
 278 out_free:
 279         free(event);
 280         if (ret && read_format)
 281                 pr_debug("read_format %#"PRIx64"\n", read_format);
 282         return ret;
 283 }
 284
 285 /**
 286  * test__sample_parsing - test sample parsing.
 287  *
 288  * This function implements a test that synthesizes a sample event, parses it
 289  * and then checks that the parsed sample matches the original sample.  The test
 290  * checks sample format bits separately and together.  If the test passes %0 is
 291  * returned, otherwise %-1 is returned.
 292  */
 293 int test__sample_parsing(void)
 294 {
 295         const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15};
 296         u64 sample_type;
 297         u64 sample_regs;
 298         size_t i;
 299         int err;
 300
 301         /*
 302          * Fail the test if it has not been updated when new sample format bits
 303          * were added.  Please actually update the test rather than just change
 304          * the condition below.
 305          */
 306         if (PERF_SAMPLE_MAX > PERF_SAMPLE_REGS_INTR << 1) {
 307                 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
 308                 return -1;
 309         }
 310
 311         /* Test each sample format bit separately */
 312         for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
 313              sample_type <<= 1) {
 314                 /* Test read_format variations */
 315                 if (sample_type == PERF_SAMPLE_READ) {
 316                         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 317                                 err = do_test(sample_type, 0, rf[i]);
 318                                 if (err)
 319                                         return err;
 320                         }
 321                         continue;
 322                 }
 323                 sample_regs = 0;
 324
 325                 if (sample_type == PERF_SAMPLE_REGS_USER)
 326                         sample_regs = 0x3fff;
 327
 328                 if (sample_type == PERF_SAMPLE_REGS_INTR)
 329                         sample_regs = 0xff0fff;
 330
 331                 err = do_test(sample_type, sample_regs, 0);
 332                 if (err)
 333                         return err;
 334         }
 335
 336         /* Test all sample format bits together */
 337         sample_type = PERF_SAMPLE_MAX - 1;
 338         sample_regs = 0x3fff; /* shared yb intr and user regs */
 339         for (i = 0; i < ARRAY_SIZE(rf); i++) {
 340                 err = do_test(sample_type, sample_regs, rf[i]);
 341                 if (err)
 342                         return err;
 343         }
 344
 345         return 0;
 346 }