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 if (type & PERF_SAMPLE_TRANSACTION) 125 COMP(transaction); 126 127 return true; 128 } 129 130 static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format) 131 { 132 struct perf_evsel evsel = { 133 .needs_swap = false, 134 .attr = { 135 .sample_type = sample_type, 136 .sample_regs_user = sample_regs_user, 137 .read_format = read_format, 138 }, 139 }; 140 union perf_event *event; 141 union { 142 struct ip_callchain callchain; 143 u64 data[64]; 144 } callchain = { 145 /* 3 ips */ 146 .data = {3, 201, 202, 203}, 147 }; 148 union { 149 struct branch_stack branch_stack; 150 u64 data[64]; 151 } branch_stack = { 152 /* 1 branch_entry */ 153 .data = {1, 211, 212, 213}, 154 }; 155 u64 user_regs[64]; 156 const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL}; 157 const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL}; 158 struct perf_sample sample = { 159 .ip = 101, 160 .pid = 102, 161 .tid = 103, 162 .time = 104, 163 .addr = 105, 164 .id = 106, 165 .stream_id = 107, 166 .period = 108, 167 .weight = 109, 168 .cpu = 110, 169 .raw_size = sizeof(raw_data), 170 .data_src = 111, 171 .transaction = 112, 172 .raw_data = (void *)raw_data, 173 .callchain = &callchain.callchain, 174 .branch_stack = &branch_stack.branch_stack, 175 .user_regs = { 176 .abi = PERF_SAMPLE_REGS_ABI_64, 177 .regs = user_regs, 178 }, 179 .user_stack = { 180 .size = sizeof(data), 181 .data = (void *)data, 182 }, 183 .read = { 184 .time_enabled = 0x030a59d664fca7deULL, 185 .time_running = 0x011b6ae553eb98edULL, 186 }, 187 }; 188 struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},}; 189 struct perf_sample sample_out; 190 size_t i, sz, bufsz; 191 int err, ret = -1; 192 193 for (i = 0; i < sizeof(user_regs); i++) 194 *(i + (u8 *)user_regs) = i & 0xfe; 195 196 if (read_format & PERF_FORMAT_GROUP) { 197 sample.read.group.nr = 4; 198 sample.read.group.values = values; 199 } else { 200 sample.read.one.value = 0x08789faeb786aa87ULL; 201 sample.read.one.id = 99; 202 } 203 204 sz = perf_event__sample_event_size(&sample, sample_type, 205 sample_regs_user, read_format); 206 bufsz = sz + 4096; /* Add a bit for overrun checking */ 207 event = malloc(bufsz); 208 if (!event) { 209 pr_debug("malloc failed\n"); 210 return -1; 211 } 212 213 memset(event, 0xff, bufsz); 214 event->header.type = PERF_RECORD_SAMPLE; 215 event->header.misc = 0; 216 event->header.size = sz; 217 218 err = perf_event__synthesize_sample(event, sample_type, 219 sample_regs_user, read_format, 220 &sample, false); 221 if (err) { 222 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 223 "perf_event__synthesize_sample", sample_type, err); 224 goto out_free; 225 } 226 227 /* The data does not contain 0xff so we use that to check the size */ 228 for (i = bufsz; i > 0; i--) { 229 if (*(i - 1 + (u8 *)event) != 0xff) 230 break; 231 } 232 if (i != sz) { 233 pr_debug("Event size mismatch: actual %zu vs expected %zu\n", 234 i, sz); 235 goto out_free; 236 } 237 238 evsel.sample_size = __perf_evsel__sample_size(sample_type); 239 240 err = perf_evsel__parse_sample(&evsel, event, &sample_out); 241 if (err) { 242 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 243 "perf_evsel__parse_sample", sample_type, err); 244 goto out_free; 245 } 246 247 if (!samples_same(&sample, &sample_out, sample_type, 248 sample_regs_user, read_format)) { 249 pr_debug("parsing failed for sample_type %#"PRIx64"\n", 250 sample_type); 251 goto out_free; 252 } 253 254 ret = 0; 255 out_free: 256 free(event); 257 if (ret && read_format) 258 pr_debug("read_format %#"PRIx64"\n", read_format); 259 return ret; 260 } 261 262 /** 263 * test__sample_parsing - test sample parsing. 264 * 265 * This function implements a test that synthesizes a sample event, parses it 266 * and then checks that the parsed sample matches the original sample. The test 267 * checks sample format bits separately and together. If the test passes %0 is 268 * returned, otherwise %-1 is returned. 269 */ 270 int test__sample_parsing(void) 271 { 272 const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15}; 273 u64 sample_type; 274 u64 sample_regs_user; 275 size_t i; 276 int err; 277 278 /* 279 * Fail the test if it has not been updated when new sample format bits 280 * were added. Please actually update the test rather than just change 281 * the condition below. 282 */ 283 if (PERF_SAMPLE_MAX > PERF_SAMPLE_TRANSACTION << 1) { 284 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n"); 285 return -1; 286 } 287 288 /* Test each sample format bit separately */ 289 for (sample_type = 1; sample_type != PERF_SAMPLE_MAX; 290 sample_type <<= 1) { 291 /* Test read_format variations */ 292 if (sample_type == PERF_SAMPLE_READ) { 293 for (i = 0; i < ARRAY_SIZE(rf); i++) { 294 err = do_test(sample_type, 0, rf[i]); 295 if (err) 296 return err; 297 } 298 continue; 299 } 300 301 if (sample_type == PERF_SAMPLE_REGS_USER) 302 sample_regs_user = 0x3fff; 303 else 304 sample_regs_user = 0; 305 306 err = do_test(sample_type, sample_regs_user, 0); 307 if (err) 308 return err; 309 } 310 311 /* Test all sample format bits together */ 312 sample_type = PERF_SAMPLE_MAX - 1; 313 sample_regs_user = 0x3fff; 314 for (i = 0; i < ARRAY_SIZE(rf); i++) { 315 err = do_test(sample_type, sample_regs_user, rf[i]); 316 if (err) 317 return err; 318 } 319 320 return 0; 321 } 322