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 "util/pmu.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 char *result; 136 }; 137 138 static int get_counter_name_callback(void *vdata, struct pmu_event_info *info) 139 { 140 struct get_counter_name_data *data = vdata; 141 int rc, event_nr; 142 const char *event_str; 143 144 if (info->str == NULL) 145 return 0; 146 147 event_str = strstr(info->str, "event="); 148 if (!event_str) 149 return 0; 150 151 rc = sscanf(event_str, "event=%x", &event_nr); 152 if (rc == 1 && event_nr == data->wanted) { 153 data->result = strdup(info->name); 154 return 1; /* Terminate the search. */ 155 } 156 return 0; 157 } 158 159 /* Scan the PMU and extract the logical name of a counter from the event. Input 160 * is the counter set and counter number with in the set. Construct the event 161 * number and use this as key. If they match return the name of this counter. 162 * If no match is found a NULL pointer is returned. 163 */ 164 static char *get_counter_name(int set, int nr, struct perf_pmu *pmu) 165 { 166 struct get_counter_name_data data = { 167 .wanted = get_counterset_start(set) + nr, 168 .result = NULL, 169 }; 170 171 if (!pmu) 172 return NULL; 173 174 perf_pmu__for_each_event(pmu, /*skip_duplicate_pmus=*/ true, 175 &data, get_counter_name_callback); 176 return data.result; 177 } 178 179 static void s390_cpumcfdg_dump(struct perf_pmu *pmu, struct perf_sample *sample) 180 { 181 size_t i, len = sample->raw_size, offset = 0; 182 unsigned char *buf = sample->raw_data; 183 const char *color = PERF_COLOR_BLUE; 184 struct cf_ctrset_entry *cep, ce; 185 u64 *p; 186 187 while (offset < len) { 188 cep = (struct cf_ctrset_entry *)(buf + offset); 189 190 ce.def = be16_to_cpu(cep->def); 191 ce.set = be16_to_cpu(cep->set); 192 ce.ctr = be16_to_cpu(cep->ctr); 193 ce.res1 = be16_to_cpu(cep->res1); 194 195 if (!ctrset_valid(&ce)) { /* Print trailer */ 196 s390_cpumcfdg_dumptrail(color, offset, 197 (struct cf_trailer_entry *)cep); 198 return; 199 } 200 201 color_fprintf(stdout, color, " [%#08zx] Counterset:%d" 202 " Counters:%d\n", offset, ce.set, ce.ctr); 203 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) { 204 char *ev_name = get_counter_name(ce.set, i, pmu); 205 206 color_fprintf(stdout, color, 207 "\tCounter:%03d %s Value:%#018lx\n", i, 208 ev_name ?: "<unknown>", be64_to_cpu(*p)); 209 free(ev_name); 210 } 211 offset += ctrset_size(&ce); 212 } 213 } 214 215 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events 216 * and if the event was triggered by a counter set diagnostic event display 217 * its raw data. 218 * The function is only invoked when the dump flag -D is set. 219 */ 220 void evlist__s390_sample_raw(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) 221 { 222 struct evsel *evsel; 223 224 if (event->header.type != PERF_RECORD_SAMPLE) 225 return; 226 227 evsel = evlist__event2evsel(evlist, event); 228 if (evsel == NULL || 229 evsel->core.attr.config != PERF_EVENT_CPUM_CF_DIAG) 230 return; 231 232 /* Display raw data on screen */ 233 if (!s390_cpumcfdg_testctr(sample)) { 234 pr_err("Invalid counter set data encountered\n"); 235 return; 236 } 237 s390_cpumcfdg_dump(evsel->pmu, sample); 238 } 239