1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2019 4 * Author(s): Thomas Richter <tmricht@linux.ibm.com> 5 * 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. 9 * 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. 13 */ 14 15 #include <unistd.h> 16 #include <stdio.h> 17 #include <string.h> 18 #include <inttypes.h> 19 20 #include <sys/stat.h> 21 #include <linux/compiler.h> 22 #include <asm/byteorder.h> 23 24 #include "debug.h" 25 #include "session.h" 26 #include "evlist.h" 27 #include "color.h" 28 #include "sample-raw.h" 29 #include "s390-cpumcf-kernel.h" 30 #include "pmu-events/pmu-events.h" 31 32 static size_t ctrset_size(struct cf_ctrset_entry *set) 33 { 34 return sizeof(*set) + set->ctr * sizeof(u64); 35 } 36 37 static bool ctrset_valid(struct cf_ctrset_entry *set) 38 { 39 return set->def == S390_CPUMCF_DIAG_DEF; 40 } 41 42 /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte 43 * aligned and might have trailing padding bytes. 44 * Display the raw data on screen. 45 */ 46 static bool s390_cpumcfdg_testctr(struct perf_sample *sample) 47 { 48 size_t len = sample->raw_size, offset = 0; 49 unsigned char *buf = sample->raw_data; 50 struct cf_trailer_entry *te; 51 struct cf_ctrset_entry *cep, ce; 52 53 if (!len) 54 return false; 55 while (offset < len) { 56 cep = (struct cf_ctrset_entry *)(buf + offset); 57 ce.def = be16_to_cpu(cep->def); 58 ce.set = be16_to_cpu(cep->set); 59 ce.ctr = be16_to_cpu(cep->ctr); 60 ce.res1 = be16_to_cpu(cep->res1); 61 62 if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) { 63 /* Raw data for counter sets are always multiple of 8 64 * bytes. Prepending a 4 bytes size field to the 65 * raw data block in the sample causes the perf tool 66 * to append 4 padding bytes to make the raw data part 67 * of the sample a multiple of eight bytes again. 68 * 69 * If the last entry (trailer) is 4 bytes off the raw 70 * area data end, all is good. 71 */ 72 if (len - offset - sizeof(*te) == 4) 73 break; 74 pr_err("Invalid counter set entry at %zd\n", offset); 75 return false; 76 } 77 offset += ctrset_size(&ce); 78 } 79 return true; 80 } 81 82 /* Dump event bc000 on screen, already tested on correctness. */ 83 static void s390_cpumcfdg_dumptrail(const char *color, size_t offset, 84 struct cf_trailer_entry *tep) 85 { 86 struct cf_trailer_entry te; 87 88 te.flags = be64_to_cpu(tep->flags); 89 te.cfvn = be16_to_cpu(tep->cfvn); 90 te.csvn = be16_to_cpu(tep->csvn); 91 te.cpu_speed = be32_to_cpu(tep->cpu_speed); 92 te.timestamp = be64_to_cpu(tep->timestamp); 93 te.progusage1 = be64_to_cpu(tep->progusage1); 94 te.progusage2 = be64_to_cpu(tep->progusage2); 95 te.progusage3 = be64_to_cpu(tep->progusage3); 96 te.tod_base = be64_to_cpu(tep->tod_base); 97 te.mach_type = be16_to_cpu(tep->mach_type); 98 te.res1 = be16_to_cpu(tep->res1); 99 te.res2 = be32_to_cpu(tep->res2); 100 101 color_fprintf(stdout, color, " [%#08zx] Trailer:%c%c%c%c%c" 102 " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n", 103 offset, te.clock_base ? 'T' : ' ', 104 te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ', 105 te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ', 106 te.cfvn, te.csvn, te.cpu_speed, te.timestamp); 107 color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx" 108 " Type:%x\n\n", 109 te.progusage1, te.progusage2, te.progusage3, 110 te.tod_base, te.mach_type); 111 } 112 113 /* Return starting number of a counter set */ 114 static int get_counterset_start(int setnr) 115 { 116 switch (setnr) { 117 case CPUMF_CTR_SET_BASIC: /* Basic counter set */ 118 return 0; 119 case CPUMF_CTR_SET_USER: /* Problem state counter set */ 120 return 32; 121 case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */ 122 return 64; 123 case CPUMF_CTR_SET_EXT: /* Extended counter set */ 124 return 128; 125 case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */ 126 return 448; 127 default: 128 return -1; 129 } 130 } 131 132 /* Scan the PMU table and extract the logical name of a counter from the 133 * PMU events table. Input is the counter set and counter number with in the 134 * set. Construct the event number and use this as key. If they match return 135 * the name of this counter. 136 * If no match is found a NULL pointer is returned. 137 */ 138 static const char *get_counter_name(int set, int nr, struct pmu_events_map *map) 139 { 140 int rc, event_nr, wanted = get_counterset_start(set) + nr; 141 142 if (map) { 143 struct pmu_event *evp = map->table; 144 145 for (; evp->name || evp->event || evp->desc; ++evp) { 146 if (evp->name == NULL || evp->event == NULL) 147 continue; 148 rc = sscanf(evp->event, "event=%x", &event_nr); 149 if (rc == 1 && event_nr == wanted) 150 return evp->name; 151 } 152 } 153 return NULL; 154 } 155 156 static void s390_cpumcfdg_dump(struct perf_sample *sample) 157 { 158 size_t i, len = sample->raw_size, offset = 0; 159 unsigned char *buf = sample->raw_data; 160 const char *color = PERF_COLOR_BLUE; 161 struct cf_ctrset_entry *cep, ce; 162 struct pmu_events_map *map; 163 struct perf_pmu pmu; 164 u64 *p; 165 166 memset(&pmu, 0, sizeof(pmu)); 167 map = perf_pmu__find_map(&pmu); 168 while (offset < len) { 169 cep = (struct cf_ctrset_entry *)(buf + offset); 170 171 ce.def = be16_to_cpu(cep->def); 172 ce.set = be16_to_cpu(cep->set); 173 ce.ctr = be16_to_cpu(cep->ctr); 174 ce.res1 = be16_to_cpu(cep->res1); 175 176 if (!ctrset_valid(&ce)) { /* Print trailer */ 177 s390_cpumcfdg_dumptrail(color, offset, 178 (struct cf_trailer_entry *)cep); 179 return; 180 } 181 182 color_fprintf(stdout, color, " [%#08zx] Counterset:%d" 183 " Counters:%d\n", offset, ce.set, ce.ctr); 184 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) { 185 const char *ev_name = get_counter_name(ce.set, i, map); 186 187 color_fprintf(stdout, color, 188 "\tCounter:%03d %s Value:%#018lx\n", i, 189 ev_name ?: "<unknown>", be64_to_cpu(*p)); 190 } 191 offset += ctrset_size(&ce); 192 } 193 } 194 195 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events 196 * and if the event was triggered by a counter set diagnostic event display 197 * its raw data. 198 * The function is only invoked when the dump flag -D is set. 199 */ 200 void perf_evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, 201 struct perf_sample *sample) 202 { 203 struct evsel *ev_bc000; 204 205 if (event->header.type != PERF_RECORD_SAMPLE) 206 return; 207 208 ev_bc000 = perf_evlist__event2evsel(evlist, event); 209 if (ev_bc000 == NULL || 210 ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG) 211 return; 212 213 /* Display raw data on screen */ 214 if (!s390_cpumcfdg_testctr(sample)) { 215 pr_err("Invalid counter set data encountered\n"); 216 return; 217 } 218 s390_cpumcfdg_dump(sample); 219 } 220