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 } 347