1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2019
4 * Author(s): Thomas Richter <tmricht@linux.ibm.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
10 * Architecture specific trace_event function. Save event's bc000 raw data
11 * to file. File name is aux.ctr.## where ## stands for the CPU number the
12 * sample was taken from.
21 #include <linux/compiler.h>
22 #include <asm/byteorder.h>
29 #include "sample-raw.h"
30 #include "s390-cpumcf-kernel.h"
31 #include "pmu-events/pmu-events.h"
33 static size_t ctrset_size(struct cf_ctrset_entry *set)
35 return sizeof(*set) + set->ctr * sizeof(u64);
38 static bool ctrset_valid(struct cf_ctrset_entry *set)
40 return set->def == S390_CPUMCF_DIAG_DEF;
43 /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte
44 * aligned and might have trailing padding bytes.
45 * Display the raw data on screen.
47 static bool s390_cpumcfdg_testctr(struct perf_sample *sample)
49 size_t len = sample->raw_size, offset = 0;
50 unsigned char *buf = sample->raw_data;
51 struct cf_trailer_entry *te;
52 struct cf_ctrset_entry *cep, ce;
56 while (offset < len) {
57 cep = (struct cf_ctrset_entry *)(buf + offset);
58 ce.def = be16_to_cpu(cep->def);
59 ce.set = be16_to_cpu(cep->set);
60 ce.ctr = be16_to_cpu(cep->ctr);
61 ce.res1 = be16_to_cpu(cep->res1);
63 if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) {
64 /* Raw data for counter sets are always multiple of 8
65 * bytes. Prepending a 4 bytes size field to the
66 * raw data block in the sample causes the perf tool
67 * to append 4 padding bytes to make the raw data part
68 * of the sample a multiple of eight bytes again.
70 * If the last entry (trailer) is 4 bytes off the raw
71 * area data end, all is good.
73 if (len - offset - sizeof(*te) == 4)
75 pr_err("Invalid counter set entry at %zd\n", offset);
78 offset += ctrset_size(&ce);
83 /* Dump event bc000 on screen, already tested on correctness. */
84 static void s390_cpumcfdg_dumptrail(const char *color, size_t offset,
85 struct cf_trailer_entry *tep)
87 struct cf_trailer_entry te;
89 te.flags = be64_to_cpu(tep->flags);
90 te.cfvn = be16_to_cpu(tep->cfvn);
91 te.csvn = be16_to_cpu(tep->csvn);
92 te.cpu_speed = be32_to_cpu(tep->cpu_speed);
93 te.timestamp = be64_to_cpu(tep->timestamp);
94 te.progusage1 = be64_to_cpu(tep->progusage1);
95 te.progusage2 = be64_to_cpu(tep->progusage2);
96 te.progusage3 = be64_to_cpu(tep->progusage3);
97 te.tod_base = be64_to_cpu(tep->tod_base);
98 te.mach_type = be16_to_cpu(tep->mach_type);
99 te.res1 = be16_to_cpu(tep->res1);
100 te.res2 = be32_to_cpu(tep->res2);
102 color_fprintf(stdout, color, " [%#08zx] Trailer:%c%c%c%c%c"
103 " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n",
104 offset, te.clock_base ? 'T' : ' ',
105 te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ',
106 te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ',
107 te.cfvn, te.csvn, te.cpu_speed, te.timestamp);
108 color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx"
110 te.progusage1, te.progusage2, te.progusage3,
111 te.tod_base, te.mach_type);
114 /* Return starting number of a counter set */
115 static int get_counterset_start(int setnr)
118 case CPUMF_CTR_SET_BASIC: /* Basic counter set */
120 case CPUMF_CTR_SET_USER: /* Problem state counter set */
122 case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */
124 case CPUMF_CTR_SET_EXT: /* Extended counter set */
126 case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */
133 /* Scan the PMU table and extract the logical name of a counter from the
134 * PMU events table. Input is the counter set and counter number with in the
135 * set. Construct the event number and use this as key. If they match return
136 * the name of this counter.
137 * If no match is found a NULL pointer is returned.
139 static const char *get_counter_name(int set, int nr, struct pmu_events_map *map)
141 int rc, event_nr, wanted = get_counterset_start(set) + nr;
144 struct pmu_event *evp = map->table;
146 for (; evp->name || evp->event || evp->desc; ++evp) {
147 if (evp->name == NULL || evp->event == NULL)
149 rc = sscanf(evp->event, "event=%x", &event_nr);
150 if (rc == 1 && event_nr == wanted)
157 static void s390_cpumcfdg_dump(struct perf_sample *sample)
159 size_t i, len = sample->raw_size, offset = 0;
160 unsigned char *buf = sample->raw_data;
161 const char *color = PERF_COLOR_BLUE;
162 struct cf_ctrset_entry *cep, ce;
163 struct pmu_events_map *map;
167 memset(&pmu, 0, sizeof(pmu));
168 map = perf_pmu__find_map(&pmu);
169 while (offset < len) {
170 cep = (struct cf_ctrset_entry *)(buf + offset);
172 ce.def = be16_to_cpu(cep->def);
173 ce.set = be16_to_cpu(cep->set);
174 ce.ctr = be16_to_cpu(cep->ctr);
175 ce.res1 = be16_to_cpu(cep->res1);
177 if (!ctrset_valid(&ce)) { /* Print trailer */
178 s390_cpumcfdg_dumptrail(color, offset,
179 (struct cf_trailer_entry *)cep);
183 color_fprintf(stdout, color, " [%#08zx] Counterset:%d"
184 " Counters:%d\n", offset, ce.set, ce.ctr);
185 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) {
186 const char *ev_name = get_counter_name(ce.set, i, map);
188 color_fprintf(stdout, color,
189 "\tCounter:%03d %s Value:%#018lx\n", i,
190 ev_name ?: "<unknown>", be64_to_cpu(*p));
192 offset += ctrset_size(&ce);
196 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events
197 * and if the event was triggered by a counter set diagnostic event display
199 * The function is only invoked when the dump flag -D is set.
201 void perf_evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event,
202 struct perf_sample *sample)
204 struct evsel *ev_bc000;
206 if (event->header.type != PERF_RECORD_SAMPLE)
209 ev_bc000 = perf_evlist__event2evsel(evlist, event);
210 if (ev_bc000 == NULL ||
211 ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG)
214 /* Display raw data on screen */
215 if (!s390_cpumcfdg_testctr(sample)) {
216 pr_err("Invalid counter set data encountered\n");
219 s390_cpumcfdg_dump(sample);