1 #include <stdbool.h> 2 #include <linux/types.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, 26 u64 type, 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(s1->user_regs.mask) * sizeof(u64); 99 100 COMP(user_regs.mask); 101 COMP(user_regs.abi); 102 if (s1->user_regs.abi && 103 (!s1->user_regs.regs || !s2->user_regs.regs || 104 memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) { 105 pr_debug("Samples differ at 'user_regs'\n"); 106 return false; 107 } 108 } 109 110 if (type & PERF_SAMPLE_STACK_USER) { 111 COMP(user_stack.size); 112 if (memcmp(s1->user_stack.data, s1->user_stack.data, 113 s1->user_stack.size)) { 114 pr_debug("Samples differ at 'user_stack'\n"); 115 return false; 116 } 117 } 118 119 if (type & PERF_SAMPLE_WEIGHT) 120 COMP(weight); 121 122 if (type & PERF_SAMPLE_DATA_SRC) 123 COMP(data_src); 124 125 if (type & PERF_SAMPLE_TRANSACTION) 126 COMP(transaction); 127 128 return true; 129 } 130 131 static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format) 132 { 133 struct perf_evsel evsel = { 134 .needs_swap = false, 135 .attr = { 136 .sample_type = sample_type, 137 .sample_regs_user = sample_regs_user, 138 .read_format = read_format, 139 }, 140 }; 141 union perf_event *event; 142 union { 143 struct ip_callchain callchain; 144 u64 data[64]; 145 } callchain = { 146 /* 3 ips */ 147 .data = {3, 201, 202, 203}, 148 }; 149 union { 150 struct branch_stack branch_stack; 151 u64 data[64]; 152 } branch_stack = { 153 /* 1 branch_entry */ 154 .data = {1, 211, 212, 213}, 155 }; 156 u64 user_regs[64]; 157 const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL}; 158 const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL}; 159 struct perf_sample sample = { 160 .ip = 101, 161 .pid = 102, 162 .tid = 103, 163 .time = 104, 164 .addr = 105, 165 .id = 106, 166 .stream_id = 107, 167 .period = 108, 168 .weight = 109, 169 .cpu = 110, 170 .raw_size = sizeof(raw_data), 171 .data_src = 111, 172 .transaction = 112, 173 .raw_data = (void *)raw_data, 174 .callchain = &callchain.callchain, 175 .branch_stack = &branch_stack.branch_stack, 176 .user_regs = { 177 .abi = PERF_SAMPLE_REGS_ABI_64, 178 .mask = sample_regs_user, 179 .regs = user_regs, 180 }, 181 .user_stack = { 182 .size = sizeof(data), 183 .data = (void *)data, 184 }, 185 .read = { 186 .time_enabled = 0x030a59d664fca7deULL, 187 .time_running = 0x011b6ae553eb98edULL, 188 }, 189 }; 190 struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},}; 191 struct perf_sample sample_out; 192 size_t i, sz, bufsz; 193 int err, ret = -1; 194 195 for (i = 0; i < sizeof(user_regs); i++) 196 *(i + (u8 *)user_regs) = i & 0xfe; 197 198 if (read_format & PERF_FORMAT_GROUP) { 199 sample.read.group.nr = 4; 200 sample.read.group.values = values; 201 } else { 202 sample.read.one.value = 0x08789faeb786aa87ULL; 203 sample.read.one.id = 99; 204 } 205 206 sz = perf_event__sample_event_size(&sample, sample_type, read_format); 207 bufsz = sz + 4096; /* Add a bit for overrun checking */ 208 event = malloc(bufsz); 209 if (!event) { 210 pr_debug("malloc failed\n"); 211 return -1; 212 } 213 214 memset(event, 0xff, bufsz); 215 event->header.type = PERF_RECORD_SAMPLE; 216 event->header.misc = 0; 217 event->header.size = sz; 218 219 err = perf_event__synthesize_sample(event, sample_type, 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, read_format)) { 248 pr_debug("parsing failed for sample_type %#"PRIx64"\n", 249 sample_type); 250 goto out_free; 251 } 252 253 ret = 0; 254 out_free: 255 free(event); 256 if (ret && read_format) 257 pr_debug("read_format %#"PRIx64"\n", read_format); 258 return ret; 259 } 260 261 /** 262 * test__sample_parsing - test sample parsing. 263 * 264 * This function implements a test that synthesizes a sample event, parses it 265 * and then checks that the parsed sample matches the original sample. The test 266 * checks sample format bits separately and together. If the test passes %0 is 267 * returned, otherwise %-1 is returned. 268 */ 269 int test__sample_parsing(void) 270 { 271 const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15}; 272 u64 sample_type; 273 u64 sample_regs_user; 274 size_t i; 275 int err; 276 277 /* 278 * Fail the test if it has not been updated when new sample format bits 279 * were added. Please actually update the test rather than just change 280 * the condition below. 281 */ 282 if (PERF_SAMPLE_MAX > PERF_SAMPLE_TRANSACTION << 1) { 283 pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n"); 284 return -1; 285 } 286 287 /* Test each sample format bit separately */ 288 for (sample_type = 1; sample_type != PERF_SAMPLE_MAX; 289 sample_type <<= 1) { 290 /* Test read_format variations */ 291 if (sample_type == PERF_SAMPLE_READ) { 292 for (i = 0; i < ARRAY_SIZE(rf); i++) { 293 err = do_test(sample_type, 0, rf[i]); 294 if (err) 295 return err; 296 } 297 continue; 298 } 299 300 if (sample_type == PERF_SAMPLE_REGS_USER) 301 sample_regs_user = 0x3fff; 302 else 303 sample_regs_user = 0; 304 305 err = do_test(sample_type, sample_regs_user, 0); 306 if (err) 307 return err; 308 } 309 310 /* Test all sample format bits together */ 311 sample_type = PERF_SAMPLE_MAX - 1; 312 sample_regs_user = 0x3fff; 313 for (i = 0; i < ARRAY_SIZE(rf); i++) { 314 err = do_test(sample_type, sample_regs_user, rf[i]); 315 if (err) 316 return err; 317 } 318 319 return 0; 320 } 321