// SPDX-License-Identifier: GPL-2.0 /* * Copyright IBM Corp. 2019 * Author(s): Thomas Richter * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2 only) * as published by the Free Software Foundation. * * Architecture specific trace_event function. Save event's bc000 raw data * to file. File name is aux.ctr.## where ## stands for the CPU number the * sample was taken from. */ #include #include #include #include #include #include #include #include "debug.h" #include "session.h" #include "evlist.h" #include "color.h" #include "sample-raw.h" #include "s390-cpumcf-kernel.h" #include "pmu-events/pmu-events.h" static size_t ctrset_size(struct cf_ctrset_entry *set) { return sizeof(*set) + set->ctr * sizeof(u64); } static bool ctrset_valid(struct cf_ctrset_entry *set) { return set->def == S390_CPUMCF_DIAG_DEF; } /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte * aligned and might have trailing padding bytes. * Display the raw data on screen. */ static bool s390_cpumcfdg_testctr(struct perf_sample *sample) { size_t len = sample->raw_size, offset = 0; unsigned char *buf = sample->raw_data; struct cf_trailer_entry *te; struct cf_ctrset_entry *cep, ce; if (!len) return false; while (offset < len) { cep = (struct cf_ctrset_entry *)(buf + offset); ce.def = be16_to_cpu(cep->def); ce.set = be16_to_cpu(cep->set); ce.ctr = be16_to_cpu(cep->ctr); ce.res1 = be16_to_cpu(cep->res1); if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) { /* Raw data for counter sets are always multiple of 8 * bytes. Prepending a 4 bytes size field to the * raw data block in the sample causes the perf tool * to append 4 padding bytes to make the raw data part * of the sample a multiple of eight bytes again. * * If the last entry (trailer) is 4 bytes off the raw * area data end, all is good. */ if (len - offset - sizeof(*te) == 4) break; pr_err("Invalid counter set entry at %zd\n", offset); return false; } offset += ctrset_size(&ce); } return true; } /* Dump event bc000 on screen, already tested on correctness. */ static void s390_cpumcfdg_dumptrail(const char *color, size_t offset, struct cf_trailer_entry *tep) { struct cf_trailer_entry te; te.flags = be64_to_cpu(tep->flags); te.cfvn = be16_to_cpu(tep->cfvn); te.csvn = be16_to_cpu(tep->csvn); te.cpu_speed = be32_to_cpu(tep->cpu_speed); te.timestamp = be64_to_cpu(tep->timestamp); te.progusage1 = be64_to_cpu(tep->progusage1); te.progusage2 = be64_to_cpu(tep->progusage2); te.progusage3 = be64_to_cpu(tep->progusage3); te.tod_base = be64_to_cpu(tep->tod_base); te.mach_type = be16_to_cpu(tep->mach_type); te.res1 = be16_to_cpu(tep->res1); te.res2 = be32_to_cpu(tep->res2); color_fprintf(stdout, color, " [%#08zx] Trailer:%c%c%c%c%c" " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n", offset, te.clock_base ? 'T' : ' ', te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ', te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ', te.cfvn, te.csvn, te.cpu_speed, te.timestamp); color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx" " Type:%x\n\n", te.progusage1, te.progusage2, te.progusage3, te.tod_base, te.mach_type); } /* Return starting number of a counter set */ static int get_counterset_start(int setnr) { switch (setnr) { case CPUMF_CTR_SET_BASIC: /* Basic counter set */ return 0; case CPUMF_CTR_SET_USER: /* Problem state counter set */ return 32; case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */ return 64; case CPUMF_CTR_SET_EXT: /* Extended counter set */ return 128; case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */ return 448; default: return -1; } } /* Scan the PMU table and extract the logical name of a counter from the * PMU events table. Input is the counter set and counter number with in the * set. Construct the event number and use this as key. If they match return * the name of this counter. * If no match is found a NULL pointer is returned. */ static const char *get_counter_name(int set, int nr, struct pmu_events_map *map) { int rc, event_nr, wanted = get_counterset_start(set) + nr; if (map) { struct pmu_event *evp = map->table; for (; evp->name || evp->event || evp->desc; ++evp) { if (evp->name == NULL || evp->event == NULL) continue; rc = sscanf(evp->event, "event=%x", &event_nr); if (rc == 1 && event_nr == wanted) return evp->name; } } return NULL; } static void s390_cpumcfdg_dump(struct perf_sample *sample) { size_t i, len = sample->raw_size, offset = 0; unsigned char *buf = sample->raw_data; const char *color = PERF_COLOR_BLUE; struct cf_ctrset_entry *cep, ce; struct pmu_events_map *map; struct perf_pmu pmu; u64 *p; memset(&pmu, 0, sizeof(pmu)); map = perf_pmu__find_map(&pmu); while (offset < len) { cep = (struct cf_ctrset_entry *)(buf + offset); ce.def = be16_to_cpu(cep->def); ce.set = be16_to_cpu(cep->set); ce.ctr = be16_to_cpu(cep->ctr); ce.res1 = be16_to_cpu(cep->res1); if (!ctrset_valid(&ce)) { /* Print trailer */ s390_cpumcfdg_dumptrail(color, offset, (struct cf_trailer_entry *)cep); return; } color_fprintf(stdout, color, " [%#08zx] Counterset:%d" " Counters:%d\n", offset, ce.set, ce.ctr); for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) { const char *ev_name = get_counter_name(ce.set, i, map); color_fprintf(stdout, color, "\tCounter:%03d %s Value:%#018lx\n", i, ev_name ?: "", be64_to_cpu(*p)); } offset += ctrset_size(&ce); } } /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events * and if the event was triggered by a counter set diagnostic event display * its raw data. * The function is only invoked when the dump flag -D is set. */ void perf_evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) { struct evsel *ev_bc000; if (event->header.type != PERF_RECORD_SAMPLE) return; ev_bc000 = perf_evlist__event2evsel(evlist, event); if (ev_bc000 == NULL || ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG) return; /* Display raw data on screen */ if (!s390_cpumcfdg_testctr(sample)) { pr_err("Invalid counter set data encountered\n"); return; } s390_cpumcfdg_dump(sample); }