217 lines
6.4 KiB
C
217 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2019
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* Author(s): Thomas Richter <tmricht@linux.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Architecture specific trace_event function. Save event's bc000 raw data
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* to file. File name is aux.ctr.## where ## stands for the CPU number the
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* sample was taken from.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <sys/stat.h>
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#include <linux/compiler.h>
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#include <asm/byteorder.h>
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#include "debug.h"
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#include "session.h"
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#include "evlist.h"
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#include "color.h"
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#include "sample-raw.h"
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#include "s390-cpumcf-kernel.h"
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#include "pmu-events/pmu-events.h"
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static size_t ctrset_size(struct cf_ctrset_entry *set)
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{
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return sizeof(*set) + set->ctr * sizeof(u64);
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}
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static bool ctrset_valid(struct cf_ctrset_entry *set)
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{
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return set->def == S390_CPUMCF_DIAG_DEF;
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}
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/* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte
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* aligned and might have trailing padding bytes.
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* Display the raw data on screen.
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*/
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static bool s390_cpumcfdg_testctr(struct perf_sample *sample)
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{
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size_t len = sample->raw_size, offset = 0;
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unsigned char *buf = sample->raw_data;
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struct cf_trailer_entry *te;
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struct cf_ctrset_entry *cep, ce;
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if (!len)
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return false;
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while (offset < len) {
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cep = (struct cf_ctrset_entry *)(buf + offset);
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ce.def = be16_to_cpu(cep->def);
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ce.set = be16_to_cpu(cep->set);
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ce.ctr = be16_to_cpu(cep->ctr);
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ce.res1 = be16_to_cpu(cep->res1);
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if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) {
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/* Raw data for counter sets are always multiple of 8
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* bytes. Prepending a 4 bytes size field to the
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* raw data block in the sample causes the perf tool
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* to append 4 padding bytes to make the raw data part
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* of the sample a multiple of eight bytes again.
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*
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* If the last entry (trailer) is 4 bytes off the raw
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* area data end, all is good.
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*/
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if (len - offset - sizeof(*te) == 4)
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break;
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pr_err("Invalid counter set entry at %zd\n", offset);
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return false;
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}
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offset += ctrset_size(&ce);
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}
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return true;
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}
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/* Dump event bc000 on screen, already tested on correctness. */
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static void s390_cpumcfdg_dumptrail(const char *color, size_t offset,
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struct cf_trailer_entry *tep)
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{
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struct cf_trailer_entry te;
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te.flags = be64_to_cpu(tep->flags);
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te.cfvn = be16_to_cpu(tep->cfvn);
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te.csvn = be16_to_cpu(tep->csvn);
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te.cpu_speed = be32_to_cpu(tep->cpu_speed);
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te.timestamp = be64_to_cpu(tep->timestamp);
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te.progusage1 = be64_to_cpu(tep->progusage1);
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te.progusage2 = be64_to_cpu(tep->progusage2);
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te.progusage3 = be64_to_cpu(tep->progusage3);
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te.tod_base = be64_to_cpu(tep->tod_base);
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te.mach_type = be16_to_cpu(tep->mach_type);
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te.res1 = be16_to_cpu(tep->res1);
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te.res2 = be32_to_cpu(tep->res2);
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color_fprintf(stdout, color, " [%#08zx] Trailer:%c%c%c%c%c"
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" Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n",
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offset, te.clock_base ? 'T' : ' ',
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te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ',
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te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ',
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te.cfvn, te.csvn, te.cpu_speed, te.timestamp);
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color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx"
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" Type:%x\n\n",
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te.progusage1, te.progusage2, te.progusage3,
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te.tod_base, te.mach_type);
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}
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/* Return starting number of a counter set */
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static int get_counterset_start(int setnr)
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{
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switch (setnr) {
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case CPUMF_CTR_SET_BASIC: /* Basic counter set */
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return 0;
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case CPUMF_CTR_SET_USER: /* Problem state counter set */
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return 32;
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case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */
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return 64;
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case CPUMF_CTR_SET_EXT: /* Extended counter set */
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return 128;
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case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */
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return 448;
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default:
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return -1;
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}
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}
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/* Scan the PMU table and extract the logical name of a counter from the
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* PMU events table. Input is the counter set and counter number with in the
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* set. Construct the event number and use this as key. If they match return
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* the name of this counter.
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* If no match is found a NULL pointer is returned.
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*/
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static const char *get_counter_name(int set, int nr, const struct pmu_events_map *map)
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{
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int rc, event_nr, wanted = get_counterset_start(set) + nr;
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if (map) {
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const struct pmu_event *evp = map->table;
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for (; evp->name || evp->event || evp->desc; ++evp) {
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if (evp->name == NULL || evp->event == NULL)
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continue;
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rc = sscanf(evp->event, "event=%x", &event_nr);
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if (rc == 1 && event_nr == wanted)
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return evp->name;
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}
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}
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return NULL;
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}
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static void s390_cpumcfdg_dump(struct perf_sample *sample)
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{
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size_t i, len = sample->raw_size, offset = 0;
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unsigned char *buf = sample->raw_data;
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const char *color = PERF_COLOR_BLUE;
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struct cf_ctrset_entry *cep, ce;
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const struct pmu_events_map *map;
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u64 *p;
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map = pmu_events_map__find();
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while (offset < len) {
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cep = (struct cf_ctrset_entry *)(buf + offset);
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ce.def = be16_to_cpu(cep->def);
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ce.set = be16_to_cpu(cep->set);
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ce.ctr = be16_to_cpu(cep->ctr);
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ce.res1 = be16_to_cpu(cep->res1);
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if (!ctrset_valid(&ce)) { /* Print trailer */
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s390_cpumcfdg_dumptrail(color, offset,
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(struct cf_trailer_entry *)cep);
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return;
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}
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color_fprintf(stdout, color, " [%#08zx] Counterset:%d"
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" Counters:%d\n", offset, ce.set, ce.ctr);
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for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) {
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const char *ev_name = get_counter_name(ce.set, i, map);
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color_fprintf(stdout, color,
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"\tCounter:%03d %s Value:%#018lx\n", i,
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ev_name ?: "<unknown>", be64_to_cpu(*p));
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}
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offset += ctrset_size(&ce);
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}
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}
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/* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events
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* and if the event was triggered by a counter set diagnostic event display
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* its raw data.
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* The function is only invoked when the dump flag -D is set.
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*/
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void evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
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{
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struct evsel *ev_bc000;
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if (event->header.type != PERF_RECORD_SAMPLE)
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return;
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ev_bc000 = evlist__event2evsel(evlist, event);
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if (ev_bc000 == NULL ||
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ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG)
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return;
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/* Display raw data on screen */
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if (!s390_cpumcfdg_testctr(sample)) {
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pr_err("Invalid counter set data encountered\n");
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return;
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}
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s390_cpumcfdg_dump(sample);
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}
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