#include <stdbool.h> #include <linux/types.h> #include "util.h" #include "event.h" #include "evsel.h" #include "debug.h" #include "tests.h" #define COMP(m) do { \ if (s1->m != s2->m) { \ pr_debug("Samples differ at '"#m"'\n"); \ return false; \ } \ } while (0) #define MCOMP(m) do { \ if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) { \ pr_debug("Samples differ at '"#m"'\n"); \ return false; \ } \ } while (0) static bool samples_same(const struct perf_sample *s1, const struct perf_sample *s2, u64 type, u64 read_format) { size_t i; if (type & PERF_SAMPLE_IDENTIFIER) COMP(id); if (type & PERF_SAMPLE_IP) COMP(ip); if (type & PERF_SAMPLE_TID) { COMP(pid); COMP(tid); } if (type & PERF_SAMPLE_TIME) COMP(time); if (type & PERF_SAMPLE_ADDR) COMP(addr); if (type & PERF_SAMPLE_ID) COMP(id); if (type & PERF_SAMPLE_STREAM_ID) COMP(stream_id); if (type & PERF_SAMPLE_CPU) COMP(cpu); if (type & PERF_SAMPLE_PERIOD) COMP(period); if (type & PERF_SAMPLE_READ) { if (read_format & PERF_FORMAT_GROUP) COMP(read.group.nr); else COMP(read.one.value); if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) COMP(read.time_enabled); if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) COMP(read.time_running); /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ if (read_format & PERF_FORMAT_GROUP) { for (i = 0; i < s1->read.group.nr; i++) MCOMP(read.group.values[i]); } else { COMP(read.one.id); } } if (type & PERF_SAMPLE_CALLCHAIN) { COMP(callchain->nr); for (i = 0; i < s1->callchain->nr; i++) COMP(callchain->ips[i]); } if (type & PERF_SAMPLE_RAW) { COMP(raw_size); if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) { pr_debug("Samples differ at 'raw_data'\n"); return false; } } if (type & PERF_SAMPLE_BRANCH_STACK) { COMP(branch_stack->nr); for (i = 0; i < s1->branch_stack->nr; i++) MCOMP(branch_stack->entries[i]); } if (type & PERF_SAMPLE_REGS_USER) { size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64); COMP(user_regs.mask); COMP(user_regs.abi); if (s1->user_regs.abi && (!s1->user_regs.regs || !s2->user_regs.regs || memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) { pr_debug("Samples differ at 'user_regs'\n"); return false; } } if (type & PERF_SAMPLE_STACK_USER) { COMP(user_stack.size); if (memcmp(s1->user_stack.data, s2->user_stack.data, s1->user_stack.size)) { pr_debug("Samples differ at 'user_stack'\n"); return false; } } if (type & PERF_SAMPLE_WEIGHT) COMP(weight); if (type & PERF_SAMPLE_DATA_SRC) COMP(data_src); if (type & PERF_SAMPLE_TRANSACTION) COMP(transaction); if (type & PERF_SAMPLE_REGS_INTR) { size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64); COMP(intr_regs.mask); COMP(intr_regs.abi); if (s1->intr_regs.abi && (!s1->intr_regs.regs || !s2->intr_regs.regs || memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) { pr_debug("Samples differ at 'intr_regs'\n"); return false; } } return true; } static int do_test(u64 sample_type, u64 sample_regs, u64 read_format) { struct perf_evsel evsel = { .needs_swap = false, .attr = { .sample_type = sample_type, .read_format = read_format, }, }; union perf_event *event; union { struct ip_callchain callchain; u64 data[64]; } callchain = { /* 3 ips */ .data = {3, 201, 202, 203}, }; union { struct branch_stack branch_stack; u64 data[64]; } branch_stack = { /* 1 branch_entry */ .data = {1, 211, 212, 213}, }; u64 regs[64]; const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL}; const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL}; struct perf_sample sample = { .ip = 101, .pid = 102, .tid = 103, .time = 104, .addr = 105, .id = 106, .stream_id = 107, .period = 108, .weight = 109, .cpu = 110, .raw_size = sizeof(raw_data), .data_src = 111, .transaction = 112, .raw_data = (void *)raw_data, .callchain = &callchain.callchain, .branch_stack = &branch_stack.branch_stack, .user_regs = { .abi = PERF_SAMPLE_REGS_ABI_64, .mask = sample_regs, .regs = regs, }, .user_stack = { .size = sizeof(data), .data = (void *)data, }, .read = { .time_enabled = 0x030a59d664fca7deULL, .time_running = 0x011b6ae553eb98edULL, }, .intr_regs = { .abi = PERF_SAMPLE_REGS_ABI_64, .mask = sample_regs, .regs = regs, }, }; struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},}; struct perf_sample sample_out; size_t i, sz, bufsz; int err, ret = -1; if (sample_type & PERF_SAMPLE_REGS_USER) evsel.attr.sample_regs_user = sample_regs; if (sample_type & PERF_SAMPLE_REGS_INTR) evsel.attr.sample_regs_intr = sample_regs; for (i = 0; i < sizeof(regs); i++) *(i + (u8 *)regs) = i & 0xfe; if (read_format & PERF_FORMAT_GROUP) { sample.read.group.nr = 4; sample.read.group.values = values; } else { sample.read.one.value = 0x08789faeb786aa87ULL; sample.read.one.id = 99; } sz = perf_event__sample_event_size(&sample, sample_type, read_format); bufsz = sz + 4096; /* Add a bit for overrun checking */ event = malloc(bufsz); if (!event) { pr_debug("malloc failed\n"); return -1; } memset(event, 0xff, bufsz); event->header.type = PERF_RECORD_SAMPLE; event->header.misc = 0; event->header.size = sz; err = perf_event__synthesize_sample(event, sample_type, read_format, &sample, false); if (err) { pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", "perf_event__synthesize_sample", sample_type, err); goto out_free; } /* The data does not contain 0xff so we use that to check the size */ for (i = bufsz; i > 0; i--) { if (*(i - 1 + (u8 *)event) != 0xff) break; } if (i != sz) { pr_debug("Event size mismatch: actual %zu vs expected %zu\n", i, sz); goto out_free; } evsel.sample_size = __perf_evsel__sample_size(sample_type); err = perf_evsel__parse_sample(&evsel, event, &sample_out); if (err) { pr_debug("%s failed for sample_type %#"PRIx64", error %d\n", "perf_evsel__parse_sample", sample_type, err); goto out_free; } if (!samples_same(&sample, &sample_out, sample_type, read_format)) { pr_debug("parsing failed for sample_type %#"PRIx64"\n", sample_type); goto out_free; } ret = 0; out_free: free(event); if (ret && read_format) pr_debug("read_format %#"PRIx64"\n", read_format); return ret; } /** * test__sample_parsing - test sample parsing. * * This function implements a test that synthesizes a sample event, parses it * and then checks that the parsed sample matches the original sample. The test * checks sample format bits separately and together. If the test passes %0 is * returned, otherwise %-1 is returned. */ int test__sample_parsing(int subtest __maybe_unused) { const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15}; u64 sample_type; u64 sample_regs; size_t i; int err; /* * Fail the test if it has not been updated when new sample format bits * were added. Please actually update the test rather than just change * the condition below. */ if (PERF_SAMPLE_MAX > PERF_SAMPLE_REGS_INTR << 1) { pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n"); return -1; } /* Test each sample format bit separately */ for (sample_type = 1; sample_type != PERF_SAMPLE_MAX; sample_type <<= 1) { /* Test read_format variations */ if (sample_type == PERF_SAMPLE_READ) { for (i = 0; i < ARRAY_SIZE(rf); i++) { err = do_test(sample_type, 0, rf[i]); if (err) return err; } continue; } sample_regs = 0; if (sample_type == PERF_SAMPLE_REGS_USER) sample_regs = 0x3fff; if (sample_type == PERF_SAMPLE_REGS_INTR) sample_regs = 0xff0fff; err = do_test(sample_type, sample_regs, 0); if (err) return err; } /* Test all sample format bits together */ sample_type = PERF_SAMPLE_MAX - 1; sample_regs = 0x3fff; /* shared yb intr and user regs */ for (i = 0; i < ARRAY_SIZE(rf); i++) { err = do_test(sample_type, sample_regs, rf[i]); if (err) return err; } return 0; }