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 - 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 } 317