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 #include "util/sample.h" 32 33 static size_t ctrset_size(struct cf_ctrset_entry *set) 34 { 35 return sizeof(*set) + set->ctr * sizeof(u64); 36 } 37 38 static bool ctrset_valid(struct cf_ctrset_entry *set) 39 { 40 return set->def == S390_CPUMCF_DIAG_DEF; 41 } 42 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. 46 */ 47 static bool s390_cpumcfdg_testctr(struct perf_sample *sample) 48 { 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; 53 54 if (!len) 55 return false; 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); 62 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. 69 * 70 * If the last entry (trailer) is 4 bytes off the raw 71 * area data end, all is good. 72 */ 73 if (len - offset - sizeof(*te) == 4) 74 break; 75 pr_err("Invalid counter set entry at %zd\n", offset); 76 return false; 77 } 78 offset += ctrset_size(&ce); 79 } 80 return true; 81 } 82 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) 86 { 87 struct cf_trailer_entry te; 88 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); 101 102 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" 109 " Type:%x\n\n", 110 te.progusage1, te.progusage2, te.progusage3, 111 te.tod_base, te.mach_type); 112 } 113 114 /* Return starting number of a counter set */ 115 static int get_counterset_start(int setnr) 116 { 117 switch (setnr) { 118 case CPUMF_CTR_SET_BASIC: /* Basic counter set */ 119 return 0; 120 case CPUMF_CTR_SET_USER: /* Problem state counter set */ 121 return 32; 122 case CPUMF_CTR_SET_CRYPTO: /* Crypto counter set */ 123 return 64; 124 case CPUMF_CTR_SET_EXT: /* Extended counter set */ 125 return 128; 126 case CPUMF_CTR_SET_MT_DIAG: /* Diagnostic counter set */ 127 return 448; 128 default: 129 return -1; 130 } 131 } 132 133 struct get_counter_name_data { 134 int wanted; 135 const char *result; 136 }; 137 138 static int get_counter_name_callback(const struct pmu_event *evp, 139 const struct pmu_events_table *table __maybe_unused, 140 void *vdata) 141 { 142 struct get_counter_name_data *data = vdata; 143 int rc, event_nr; 144 145 if (evp->name == NULL || evp->event == NULL) 146 return 0; 147 rc = sscanf(evp->event, "event=%x", &event_nr); 148 if (rc == 1 && event_nr == data->wanted) { 149 data->result = evp->name; 150 return 1; /* Terminate the search. */ 151 } 152 return 0; 153 } 154 155 /* Scan the PMU table and extract the logical name of a counter from the 156 * PMU events table. Input is the counter set and counter number with in the 157 * set. Construct the event number and use this as key. If they match return 158 * the name of this counter. 159 * If no match is found a NULL pointer is returned. 160 */ 161 static const char *get_counter_name(int set, int nr, const struct pmu_events_table *table) 162 { 163 struct get_counter_name_data data = { 164 .wanted = get_counterset_start(set) + nr, 165 .result = NULL, 166 }; 167 168 if (!table) 169 return NULL; 170 171 pmu_events_table_for_each_event(table, get_counter_name_callback, &data); 172 return data.result; 173 } 174 175 static void s390_cpumcfdg_dump(struct perf_sample *sample) 176 { 177 size_t i, len = sample->raw_size, offset = 0; 178 unsigned char *buf = sample->raw_data; 179 const char *color = PERF_COLOR_BLUE; 180 struct cf_ctrset_entry *cep, ce; 181 const struct pmu_events_table *table; 182 u64 *p; 183 184 table = pmu_events_table__find(); 185 while (offset < len) { 186 cep = (struct cf_ctrset_entry *)(buf + offset); 187 188 ce.def = be16_to_cpu(cep->def); 189 ce.set = be16_to_cpu(cep->set); 190 ce.ctr = be16_to_cpu(cep->ctr); 191 ce.res1 = be16_to_cpu(cep->res1); 192 193 if (!ctrset_valid(&ce)) { /* Print trailer */ 194 s390_cpumcfdg_dumptrail(color, offset, 195 (struct cf_trailer_entry *)cep); 196 return; 197 } 198 199 color_fprintf(stdout, color, " [%#08zx] Counterset:%d" 200 " Counters:%d\n", offset, ce.set, ce.ctr); 201 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) { 202 const char *ev_name = get_counter_name(ce.set, i, table); 203 204 color_fprintf(stdout, color, 205 "\tCounter:%03d %s Value:%#018lx\n", i, 206 ev_name ?: "<unknown>", be64_to_cpu(*p)); 207 } 208 offset += ctrset_size(&ce); 209 } 210 } 211 212 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events 213 * and if the event was triggered by a counter set diagnostic event display 214 * its raw data. 215 * The function is only invoked when the dump flag -D is set. 216 */ 217 void evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) 218 { 219 struct evsel *ev_bc000; 220 221 if (event->header.type != PERF_RECORD_SAMPLE) 222 return; 223 224 ev_bc000 = evlist__event2evsel(evlist, event); 225 if (ev_bc000 == NULL || 226 ev_bc000->core.attr.config != PERF_EVENT_CPUM_CF_DIAG) 227 return; 228 229 /* Display raw data on screen */ 230 if (!s390_cpumcfdg_testctr(sample)) { 231 pr_err("Invalid counter set data encountered\n"); 232 return; 233 } 234 s390_cpumcfdg_dump(sample); 235 } 236