1 #include <stdbool.h> 2 #include <inttypes.h> 3 #include <linux/kernel.h> 4 #include <linux/types.h> 5 6 #include "util.h" 7 #include "event.h" 8 #include "evsel.h" 9 #include "debug.h" 10 11 #include "tests.h" 12 13 #define COMP(m) do { \ 14 if (s1->m != s2->m) { \ 15 pr_debug("Samples differ at '"#m"'\n"); \ 16 return false; \ 17 } \ 18 } while (0) 19 20 #define MCOMP(m) do { \ 21 if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) { \ 22 pr_debug("Samples differ at '"#m"'\n"); \ 23 return false; \ 24 } \ 25 } while (0) 26 27 static bool samples_same(const struct perf_sample *s1, 28 const struct perf_sample *s2, 29 u64 type, u64 read_format) 30 { 31 size_t i; 32 33 if (type & PERF_SAMPLE_IDENTIFIER) 34 COMP(id); 35 36 if (type & PERF_SAMPLE_IP) 37 COMP(ip); 38 39 if (type & PERF_SAMPLE_TID) { 40 COMP(pid); 41 COMP(tid); 42 } 43 44 if (type & PERF_SAMPLE_TIME) 45 COMP(time); 46 47 if (type & PERF_SAMPLE_ADDR) 48 COMP(addr); 49 50 if (type & PERF_SAMPLE_ID) 51 COMP(id); 52 53 if (type & PERF_SAMPLE_STREAM_ID) 54 COMP(stream_id); 55 56 if (type & PERF_SAMPLE_CPU) 57 COMP(cpu); 58 59 if (type & PERF_SAMPLE_PERIOD) 60 COMP(period); 61 62 if (type & PERF_SAMPLE_READ) { 63 if (read_format & PERF_FORMAT_GROUP) 64 COMP(read.group.nr); 65 else 66 COMP(read.one.value); 67 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 68 COMP(read.time_enabled); 69 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 70 COMP(read.time_running); 71 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 72 if (read_format & PERF_FORMAT_GROUP) { 73 for (i = 0; i < s1->read.group.nr; i++) 74 MCOMP(read.group.values[i]); 75 } else { 76 COMP(read.one.id); 77 } 78 } 79 80 if (type & PERF_SAMPLE_CALLCHAIN) { 81 COMP(callchain->nr); 82 for (i = 0; i < s1->callchain->nr; i++) 83 COMP(callchain->ips[i]); 84 } 85 86 if (type & PERF_SAMPLE_RAW) { 87 COMP(raw_size); 88 if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) { 89 pr_debug("Samples differ at 'raw_data'\n"); 90 return false; 91 } 92 } 93 94 if (type & PERF_SAMPLE_BRANCH_STACK) { 95 COMP(branch_stack->nr); 96 for (i = 0; i < s1->branch_stack->nr; i++) 97 MCOMP(branch_stack->entries[i]); 98 } 99 100 if (type & PERF_SAMPLE_REGS_USER) { 101 size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64); 102 103 COMP(user_regs.mask); 104 COMP(user_regs.abi); 105 if (s1->user_regs.abi && 106 (!s1->user_regs.regs || !s2->user_regs.regs || 107 memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) { 108 pr_debug("Samples differ at 'user_regs'\n"); 109 return false; 110 } 111 } 112 113 if (type & PERF_SAMPLE_STACK_USER) { 114 COMP(user_stack.size); 115 if (memcmp(s1->user_stack.data, s2->user_stack.data, 116 s1->user_stack.size)) { 117 pr_debug("Samples differ at 'user_stack'\n"); 118 return false; 119 } 120 } 121 122 if (type & PERF_SAMPLE_WEIGHT) 123 COMP(weight); 124 125 if (type & PERF_SAMPLE_DATA_SRC) 126 COMP(data_src); 127 128 if (type & PERF_SAMPLE_TRANSACTION) 129 COMP(transaction); 130 131 if (type & PERF_SAMPLE_REGS_INTR) { 132 size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64); 133 134 COMP(intr_regs.mask); 135 COMP(intr_regs.abi); 136 if (s1->intr_regs.abi && 137 (!s1->intr_regs.regs || !s2->intr_regs.regs || 138 memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) { 139 pr_debug("Samples differ at 'intr_regs'\n"); 140 return false; 141 } 142 } 143 144 return true; 145 } 146 147 static int do_test(u64 sample_type, u64 sample_regs, u64 read_format) 148 { 149 struct perf_evsel evsel = { 150 .needs_swap = false, 151 .attr = { 152 .sample_type = sample_type, 153 .read_format = read_format, 154 }, 155 }; 156 union perf_event *event; 157 union { 158 struct ip_callchain callchain; 159 u64 data[64]; 160 } callchain = { 161 /* 3 ips */ 162 .data = {3, 201, 202, 203}, 163 }; 164 union { 165 struct branch_stack branch_stack; 166 u64 data[64]; 167 } branch_stack = { 168 /* 1 branch_entry */ 169 .data = {1, 211, 212, 213}, 170 }; 171 u64 regs[64]; 172 const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL}; 173 const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL}; 174 struct perf_sample sample = { 175 .ip = 101, 176 .pid = 102, 177 .tid = 103, 178 .time = 104, 179 .addr = 105, 180 .id = 106, 181 .stream_id = 107, 182 .period = 108, 183 .weight = 109, 184 .cpu = 110, 185 .raw_size = sizeof(raw_data), 186 .data_src = 111, 187 .transaction = 112, 188 .raw_data = (void *)raw_data, 189 .callchain = &callchain.callchain, 190 .branch_stack = &branch_stack.branch_stack, 191 .user_regs = { 192 .abi = PERF_SAMPLE_REGS_ABI_64, 193 .mask = sample_regs, 194 .regs = regs, 195 }, 196 .user_stack = { 197 .size = sizeof(data), 198 .data = (void *)data, 199 }, 200 .read = { 201 .time_enabled = 0x030a59d664fca7deULL, 202 .time_running = 0x011b6ae553eb98edULL, 203 }, 204 .intr_regs = { 205 .abi = PERF_SAMPLE_REGS_ABI_64, 206 .mask = sample_regs, 207 .regs = regs, 208 }, 209 }; 210 struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},}; 211 struct perf_sample sample_out; 212 size_t i, sz, bufsz; 213 int err, ret = -1; 214 215 if (sample_type & PERF_SAMPLE_REGS_USER) 216 evsel.attr.sample_regs_user = sample_regs; 217 218 if (sample_type & PERF_SAMPLE_REGS_INTR) 219 evsel.attr.sample_regs_intr = sample_regs; 220 221 for (i = 0; i < sizeof(regs); i++) 222 *(i + (u8 *)regs) = i & 0xfe; 223 224 if (read_format & PERF_FORMAT_GROUP) { 225 sample.read.group.nr = 4; 226 sample.read.group.values = values; 227 } else { 228 sample.read.one.value = 0x08789faeb786aa87ULL; 229 sample.read.one.id = 99; 230 } 231 232 sz = perf_event__sample_event_size(&sample, sample_type, read_format); 233 bufsz = sz + 4096; /* Add a bit for overrun checking */ 234 event = malloc(bufsz); 235 if (!event) { 236 pr_debug("malloc failed\n"); 237 return -1; 238 } 239 240 memset(event, 0xff, bufsz); 241 event->header.type = PERF_RECORD_SAMPLE; 242 event->header.misc = 0; 243 event->header.size = sz; 244 245 err = perf_event__synthesize_sample(event, sample_type, read_format, 246 &sample, false); 247 if (err) { 248 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 249 "perf_event__synthesize_sample", sample_type, err); 250 goto out_free; 251 } 252 253 /* The data does not contain 0xff so we use that to check the size */ 254 for (i = bufsz; i > 0; i--) { 255 if (*(i - 1 + (u8 *)event) != 0xff) 256 break; 257 } 258 if (i != sz) { 259 pr_debug("Event size mismatch: actual %zu vs expected %zu\n", 260 i, sz); 261 goto out_free; 262 } 263 264 evsel.sample_size = __perf_evsel__sample_size(sample_type); 265 266 err = perf_evsel__parse_sample(&evsel, event, &sample_out); 267 if (err) { 268 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 269 "perf_evsel__parse_sample", sample_type, err); 270 goto out_free; 271 } 272 273 if (!samples_same(&sample, &sample_out, sample_type, read_format)) { 274 pr_debug("parsing failed for sample_type %#"PRIx64"\n", 275 sample_type); 276 goto out_free; 277 } 278 279 ret = 0; 280 out_free: 281 free(event); 282 if (ret && read_format) 283 pr_debug("read_format %#"PRIx64"\n", read_format); 284 return ret; 285 } 286 287 /** 288 * test__sample_parsing - test sample parsing. 289 * 290 * This function implements a test that synthesizes a sample event, parses it 291 * and then checks that the parsed sample matches the original sample. The test 292 * checks sample format bits separately and together. If the test passes %0 is 293 * returned, otherwise %-1 is returned. 294 */ 295 int test__sample_parsing(int subtest __maybe_unused) 296 { 297 const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15}; 298 u64 sample_type; 299 u64 sample_regs; 300 size_t i; 301 int err; 302 303 /* 304 * Fail the test if it has not been updated when new sample format bits 305 * were added. Please actually update the test rather than just change 306 * the condition below. 307 */ 308 if (PERF_SAMPLE_MAX > PERF_SAMPLE_REGS_INTR << 1) { 309 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n"); 310 return -1; 311 } 312 313 /* Test each sample format bit separately */ 314 for (sample_type = 1; sample_type != PERF_SAMPLE_MAX; 315 sample_type <<= 1) { 316 /* Test read_format variations */ 317 if (sample_type == PERF_SAMPLE_READ) { 318 for (i = 0; i < ARRAY_SIZE(rf); i++) { 319 err = do_test(sample_type, 0, rf[i]); 320 if (err) 321 return err; 322 } 323 continue; 324 } 325 sample_regs = 0; 326 327 if (sample_type == PERF_SAMPLE_REGS_USER) 328 sample_regs = 0x3fff; 329 330 if (sample_type == PERF_SAMPLE_REGS_INTR) 331 sample_regs = 0xff0fff; 332 333 err = do_test(sample_type, sample_regs, 0); 334 if (err) 335 return err; 336 } 337 338 /* Test all sample format bits together */ 339 sample_type = PERF_SAMPLE_MAX - 1; 340 sample_regs = 0x3fff; /* shared yb intr and user regs */ 341 for (i = 0; i < ARRAY_SIZE(rf); i++) { 342 err = do_test(sample_type, sample_regs, rf[i]); 343 if (err) 344 return err; 345 } 346 347 return 0; 348 } 349