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 "util.h" 26 #include "auxtrace.h" 27 #include "session.h" 28 #include "evlist.h" 29 #include "config.h" 30 #include "color.h" 31 #include "sample-raw.h" 32 #include "s390-cpumcf-kernel.h" 33 #include "pmu-events/pmu-events.h" 34 35 static size_t ctrset_size(struct cf_ctrset_entry *set) 36 { 37 return sizeof(*set) + set->ctr * sizeof(u64); 38 } 39 40 static bool ctrset_valid(struct cf_ctrset_entry *set) 41 { 42 return set->def == S390_CPUMCF_DIAG_DEF; 43 } 44 45 /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte 46 * aligned and might have trailing padding bytes. 47 * Display the raw data on screen. 48 */ 49 static bool s390_cpumcfdg_testctr(struct perf_sample *sample) 50 { 51 size_t len = sample->raw_size, offset = 0; 52 unsigned char *buf = sample->raw_data; 53 struct cf_trailer_entry *te; 54 struct cf_ctrset_entry *cep, ce; 55 56 if (!len) 57 return false; 58 while (offset < len) { 59 cep = (struct cf_ctrset_entry *)(buf + offset); 60 ce.def = be16_to_cpu(cep->def); 61 ce.set = be16_to_cpu(cep->set); 62 ce.ctr = be16_to_cpu(cep->ctr); 63 ce.res1 = be16_to_cpu(cep->res1); 64 65 if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) { 66 /* Raw data for counter sets are always multiple of 8 67 * bytes. Prepending a 4 bytes size field to the 68 * raw data block in the sample causes the perf tool 69 * to append 4 padding bytes to make the raw data part 70 * of the sample a multiple of eight bytes again. 71 * 72 * If the last entry (trailer) is 4 bytes off the raw 73 * area data end, all is good. 74 */ 75 if (len - offset - sizeof(*te) == 4) 76 break; 77 pr_err("Invalid counter set entry at %zd\n", offset); 78 return false; 79 } 80 offset += ctrset_size(&ce); 81 } 82 return true; 83 } 84 85 /* Dump event bc000 on screen, already tested on correctness. */ 86 static void s390_cpumcfdg_dumptrail(const char *color, size_t offset, 87 struct cf_trailer_entry *tep) 88 { 89 struct cf_trailer_entry te; 90 91 te.flags = be64_to_cpu(tep->flags); 92 te.cfvn = be16_to_cpu(tep->cfvn); 93 te.csvn = be16_to_cpu(tep->csvn); 94 te.cpu_speed = be32_to_cpu(tep->cpu_speed); 95 te.timestamp = be64_to_cpu(tep->timestamp); 96 te.progusage1 = be64_to_cpu(tep->progusage1); 97 te.progusage2 = be64_to_cpu(tep->progusage2); 98 te.progusage3 = be64_to_cpu(tep->progusage3); 99 te.tod_base = be64_to_cpu(tep->tod_base); 100 te.mach_type = be16_to_cpu(tep->mach_type); 101 te.res1 = be16_to_cpu(tep->res1); 102 te.res2 = be32_to_cpu(tep->res2); 103 104 color_fprintf(stdout, color, " [%#08zx] Trailer:%c%c%c%c%c" 105 " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n", 106 offset, te.clock_base ? 'T' : ' ', 107 te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ', 108 te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ', 109 te.cfvn, te.csvn, te.cpu_speed, te.timestamp); 110 color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx" 111 " Type:%x\n\n", 112 te.progusage1, te.progusage2, te.progusage3, 113 te.tod_base, te.mach_type); 114 } 115 116 /* Return starting number of a counter set */ 117 static int get_counterset_start(int setnr) 118 { 119 switch (setnr) { 120 case CPUMF_CTR_SET_BASIC: /* Basic counter set */ 121 return 0; 122 case CPUMF_CTR_SET_USER: /* Problem state counter set */ 123 return 32; 124 case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */ 125 return 64; 126 case CPUMF_CTR_SET_EXT: /* Extended counter set */ 127 return 128; 128 case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */ 129 return 448; 130 default: 131 return -1; 132 } 133 } 134 135 /* Scan the PMU table and extract the logical name of a counter from the 136 * PMU events table. Input is the counter set and counter number with in the 137 * set. Construct the event number and use this as key. If they match return 138 * the name of this counter. 139 * If no match is found a NULL pointer is returned. 140 */ 141 static const char *get_counter_name(int set, int nr, struct pmu_events_map *map) 142 { 143 int rc, event_nr, wanted = get_counterset_start(set) + nr; 144 145 if (map) { 146 struct pmu_event *evp = map->table; 147 148 for (; evp->name || evp->event || evp->desc; ++evp) { 149 if (evp->name == NULL || evp->event == NULL) 150 continue; 151 rc = sscanf(evp->event, "event=%x", &event_nr); 152 if (rc == 1 && event_nr == wanted) 153 return evp->name; 154 } 155 } 156 return NULL; 157 } 158 159 static void s390_cpumcfdg_dump(struct perf_sample *sample) 160 { 161 size_t i, len = sample->raw_size, offset = 0; 162 unsigned char *buf = sample->raw_data; 163 const char *color = PERF_COLOR_BLUE; 164 struct cf_ctrset_entry *cep, ce; 165 struct pmu_events_map *map; 166 struct perf_pmu pmu; 167 u64 *p; 168 169 memset(&pmu, 0, sizeof(pmu)); 170 map = perf_pmu__find_map(&pmu); 171 while (offset < len) { 172 cep = (struct cf_ctrset_entry *)(buf + offset); 173 174 ce.def = be16_to_cpu(cep->def); 175 ce.set = be16_to_cpu(cep->set); 176 ce.ctr = be16_to_cpu(cep->ctr); 177 ce.res1 = be16_to_cpu(cep->res1); 178 179 if (!ctrset_valid(&ce)) { /* Print trailer */ 180 s390_cpumcfdg_dumptrail(color, offset, 181 (struct cf_trailer_entry *)cep); 182 return; 183 } 184 185 color_fprintf(stdout, color, " [%#08zx] Counterset:%d" 186 " Counters:%d\n", offset, ce.set, ce.ctr); 187 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) { 188 const char *ev_name = get_counter_name(ce.set, i, map); 189 190 color_fprintf(stdout, color, 191 "\tCounter:%03d %s Value:%#018lx\n", i, 192 ev_name ?: "<unknown>", be64_to_cpu(*p)); 193 } 194 offset += ctrset_size(&ce); 195 } 196 } 197 198 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events 199 * and if the event was triggered by a counter set diagnostic event display 200 * its raw data. 201 * The function is only invoked when the dump flag -D is set. 202 */ 203 void perf_evlist__s390_sample_raw(struct perf_evlist *evlist, union perf_event *event, 204 struct perf_sample *sample) 205 { 206 struct perf_evsel *ev_bc000; 207 208 if (event->header.type != PERF_RECORD_SAMPLE) 209 return; 210 211 ev_bc000 = perf_evlist__event2evsel(evlist, event); 212 if (ev_bc000 == NULL || 213 ev_bc000->attr.config != PERF_EVENT_CPUM_CF_DIAG) 214 return; 215 216 /* Display raw data on screen */ 217 if (!s390_cpumcfdg_testctr(sample)) { 218 pr_err("Invalid counter set data encountered\n"); 219 return; 220 } 221 s390_cpumcfdg_dump(sample); 222 } 223