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, s1->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 return true; 130 } 131 132 static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format) 133 { 134 struct perf_evsel evsel = { 135 .needs_swap = false, 136 .attr = { 137 .sample_type = sample_type, 138 .sample_regs_user = sample_regs_user, 139 .read_format = read_format, 140 }, 141 }; 142 union perf_event *event; 143 union { 144 struct ip_callchain callchain; 145 u64 data[64]; 146 } callchain = { 147 /* 3 ips */ 148 .data = {3, 201, 202, 203}, 149 }; 150 union { 151 struct branch_stack branch_stack; 152 u64 data[64]; 153 } branch_stack = { 154 /* 1 branch_entry */ 155 .data = {1, 211, 212, 213}, 156 }; 157 u64 user_regs[64]; 158 const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL}; 159 const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL}; 160 struct perf_sample sample = { 161 .ip = 101, 162 .pid = 102, 163 .tid = 103, 164 .time = 104, 165 .addr = 105, 166 .id = 106, 167 .stream_id = 107, 168 .period = 108, 169 .weight = 109, 170 .cpu = 110, 171 .raw_size = sizeof(raw_data), 172 .data_src = 111, 173 .transaction = 112, 174 .raw_data = (void *)raw_data, 175 .callchain = &callchain.callchain, 176 .branch_stack = &branch_stack.branch_stack, 177 .user_regs = { 178 .abi = PERF_SAMPLE_REGS_ABI_64, 179 .mask = sample_regs_user, 180 .regs = user_regs, 181 }, 182 .user_stack = { 183 .size = sizeof(data), 184 .data = (void *)data, 185 }, 186 .read = { 187 .time_enabled = 0x030a59d664fca7deULL, 188 .time_running = 0x011b6ae553eb98edULL, 189 }, 190 }; 191 struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},}; 192 struct perf_sample sample_out; 193 size_t i, sz, bufsz; 194 int err, ret = -1; 195 196 for (i = 0; i < sizeof(user_regs); i++) 197 *(i + (u8 *)user_regs) = i & 0xfe; 198 199 if (read_format & PERF_FORMAT_GROUP) { 200 sample.read.group.nr = 4; 201 sample.read.group.values = values; 202 } else { 203 sample.read.one.value = 0x08789faeb786aa87ULL; 204 sample.read.one.id = 99; 205 } 206 207 sz = perf_event__sample_event_size(&sample, sample_type, read_format); 208 bufsz = sz + 4096; /* Add a bit for overrun checking */ 209 event = malloc(bufsz); 210 if (!event) { 211 pr_debug("malloc failed\n"); 212 return -1; 213 } 214 215 memset(event, 0xff, bufsz); 216 event->header.type = PERF_RECORD_SAMPLE; 217 event->header.misc = 0; 218 event->header.size = sz; 219 220 err = perf_event__synthesize_sample(event, sample_type, read_format, 221 &sample, false); 222 if (err) { 223 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 224 "perf_event__synthesize_sample", sample_type, err); 225 goto out_free; 226 } 227 228 /* The data does not contain 0xff so we use that to check the size */ 229 for (i = bufsz; i > 0; i--) { 230 if (*(i - 1 + (u8 *)event) != 0xff) 231 break; 232 } 233 if (i != sz) { 234 pr_debug("Event size mismatch: actual %zu vs expected %zu\n", 235 i, sz); 236 goto out_free; 237 } 238 239 evsel.sample_size = __perf_evsel__sample_size(sample_type); 240 241 err = perf_evsel__parse_sample(&evsel, event, &sample_out); 242 if (err) { 243 pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", 244 "perf_evsel__parse_sample", sample_type, err); 245 goto out_free; 246 } 247 248 if (!samples_same(&sample, &sample_out, sample_type, 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