1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdbool.h> 3 #include <assert.h> 4 #include <errno.h> 5 #include <stdlib.h> 6 #include <string.h> 7 #include "metricgroup.h" 8 #include "debug.h" 9 #include "evlist.h" 10 #include "expr.h" 11 #include "smt.h" 12 #include "tool_pmu.h" 13 #include <util/expr-bison.h> 14 #include <util/expr-flex.h> 15 #include "util/hashmap.h" 16 #include "util/header.h" 17 #include "util/pmu.h" 18 #include <perf/cpumap.h> 19 #include <linux/err.h> 20 #include <linux/kernel.h> 21 #include <linux/zalloc.h> 22 #include <ctype.h> 23 #include <math.h> 24 25 struct expr_id_data { 26 union { 27 struct { 28 double val; 29 int source_count; 30 int aggr_nr; 31 } val; 32 struct { 33 double val; 34 const char *metric_name; 35 const char *metric_expr; 36 } ref; 37 }; 38 39 enum { 40 /* Holding a double value. */ 41 EXPR_ID_DATA__VALUE, 42 /* Reference to another metric. */ 43 EXPR_ID_DATA__REF, 44 /* A reference but the value has been computed. */ 45 EXPR_ID_DATA__REF_VALUE, 46 } kind; 47 }; 48 49 static size_t key_hash(long key, void *ctx __maybe_unused) 50 { 51 const char *str = (const char *)key; 52 size_t hash = 0; 53 54 while (*str != '\0') { 55 hash *= 31; 56 hash += *str; 57 str++; 58 } 59 return hash; 60 } 61 62 static bool key_equal(long key1, long key2, void *ctx __maybe_unused) 63 { 64 return !strcmp((const char *)key1, (const char *)key2); 65 } 66 67 struct hashmap *ids__new(void) 68 { 69 struct hashmap *hash; 70 71 hash = hashmap__new(key_hash, key_equal, NULL); 72 if (IS_ERR(hash)) 73 return NULL; 74 return hash; 75 } 76 77 void ids__free(struct hashmap *ids) 78 { 79 struct hashmap_entry *cur; 80 size_t bkt; 81 82 if (ids == NULL) 83 return; 84 85 hashmap__for_each_entry(ids, cur, bkt) { 86 zfree(&cur->pkey); 87 zfree(&cur->pvalue); 88 } 89 90 hashmap__free(ids); 91 } 92 93 int ids__insert(struct hashmap *ids, const char *id) 94 { 95 struct expr_id_data *data_ptr = NULL, *old_data = NULL; 96 char *old_key = NULL; 97 int ret; 98 99 ret = hashmap__set(ids, id, data_ptr, &old_key, &old_data); 100 if (ret) 101 free(data_ptr); 102 free(old_key); 103 free(old_data); 104 return ret; 105 } 106 107 struct hashmap *ids__union(struct hashmap *ids1, struct hashmap *ids2) 108 { 109 size_t bkt; 110 struct hashmap_entry *cur; 111 int ret; 112 struct expr_id_data *old_data = NULL; 113 char *old_key = NULL; 114 115 if (!ids1) 116 return ids2; 117 118 if (!ids2) 119 return ids1; 120 121 if (hashmap__size(ids1) < hashmap__size(ids2)) { 122 struct hashmap *tmp = ids1; 123 124 ids1 = ids2; 125 ids2 = tmp; 126 } 127 hashmap__for_each_entry(ids2, cur, bkt) { 128 ret = hashmap__set(ids1, cur->key, cur->value, &old_key, &old_data); 129 free(old_key); 130 free(old_data); 131 132 if (ret) { 133 hashmap__free(ids1); 134 hashmap__free(ids2); 135 return NULL; 136 } 137 } 138 hashmap__free(ids2); 139 return ids1; 140 } 141 142 /* Caller must make sure id is allocated */ 143 int expr__add_id(struct expr_parse_ctx *ctx, const char *id) 144 { 145 return ids__insert(ctx->ids, id); 146 } 147 148 /* Caller must make sure id is allocated */ 149 int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val) 150 { 151 return expr__add_id_val_source_count(ctx, id, val, /*source_count=*/1); 152 } 153 154 /* Caller must make sure id is allocated */ 155 int expr__add_id_val_source_count_aggr_nr(struct expr_parse_ctx *ctx, const char *id, 156 double val, int source_count, int aggr_nr) 157 { 158 struct expr_id_data *data_ptr = NULL, *old_data = NULL; 159 char *old_key = NULL; 160 int ret; 161 162 data_ptr = malloc(sizeof(*data_ptr)); 163 if (!data_ptr) 164 return -ENOMEM; 165 data_ptr->val.val = val; 166 data_ptr->val.source_count = source_count; 167 data_ptr->val.aggr_nr = aggr_nr; 168 data_ptr->kind = EXPR_ID_DATA__VALUE; 169 170 ret = hashmap__set(ctx->ids, id, data_ptr, &old_key, &old_data); 171 if (ret) { 172 free(data_ptr); 173 } else if (old_data) { 174 data_ptr->val.val += old_data->val.val; 175 data_ptr->val.source_count += old_data->val.source_count; 176 data_ptr->val.aggr_nr += old_data->val.aggr_nr; 177 } 178 free(old_key); 179 free(old_data); 180 return ret; 181 } 182 183 /* Caller must make sure id is allocated */ 184 int expr__add_id_val_source_count(struct expr_parse_ctx *ctx, const char *id, 185 double val, int source_count) 186 { 187 return expr__add_id_val_source_count_aggr_nr(ctx, id, val, source_count, 1); 188 } 189 190 int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref) 191 { 192 struct expr_id_data *data_ptr = NULL, *old_data = NULL; 193 char *old_key = NULL; 194 char *name; 195 int ret; 196 197 data_ptr = zalloc(sizeof(*data_ptr)); 198 if (!data_ptr) 199 return -ENOMEM; 200 201 name = strdup(ref->metric_name); 202 if (!name) { 203 free(data_ptr); 204 return -ENOMEM; 205 } 206 207 /* 208 * Intentionally passing just const char pointers, 209 * originally from 'struct pmu_event' object. 210 * We don't need to change them, so there's no 211 * need to create our own copy. 212 */ 213 data_ptr->ref.metric_name = ref->metric_name; 214 data_ptr->ref.metric_expr = ref->metric_expr; 215 data_ptr->kind = EXPR_ID_DATA__REF; 216 217 ret = hashmap__set(ctx->ids, name, data_ptr, &old_key, &old_data); 218 if (ret) 219 free(data_ptr); 220 221 pr_debug2("adding ref metric %s: %s\n", 222 ref->metric_name, ref->metric_expr); 223 224 free(old_key); 225 free(old_data); 226 return ret; 227 } 228 229 int expr__get_id(struct expr_parse_ctx *ctx, const char *id, 230 struct expr_id_data **data) 231 { 232 if (!ctx || !id) 233 return -1; 234 return hashmap__find(ctx->ids, id, data) ? 0 : -1; 235 } 236 237 bool expr__subset_of_ids(struct expr_parse_ctx *haystack, 238 struct expr_parse_ctx *needles) 239 { 240 struct hashmap_entry *cur; 241 size_t bkt; 242 struct expr_id_data *data; 243 244 hashmap__for_each_entry(needles->ids, cur, bkt) { 245 if (expr__get_id(haystack, cur->pkey, &data)) 246 return false; 247 } 248 return true; 249 } 250 251 252 int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id, 253 struct expr_id_data **datap) 254 { 255 struct expr_id_data *data; 256 257 if (expr__get_id(ctx, id, datap) || !*datap) { 258 pr_debug("%s not found\n", id); 259 return -1; 260 } 261 262 data = *datap; 263 264 switch (data->kind) { 265 case EXPR_ID_DATA__VALUE: 266 pr_debug2("lookup(%s): val %f\n", id, data->val.val); 267 break; 268 case EXPR_ID_DATA__REF: 269 pr_debug2("lookup(%s): ref metric name %s\n", id, 270 data->ref.metric_name); 271 pr_debug("processing metric: %s ENTRY\n", id); 272 data->kind = EXPR_ID_DATA__REF_VALUE; 273 if (expr__parse(&data->ref.val, ctx, data->ref.metric_expr)) { 274 pr_debug("%s failed to count\n", id); 275 return -1; 276 } 277 pr_debug("processing metric: %s EXIT: %f\n", id, data->ref.val); 278 break; 279 case EXPR_ID_DATA__REF_VALUE: 280 pr_debug2("lookup(%s): ref val %f metric name %s\n", id, 281 data->ref.val, data->ref.metric_name); 282 break; 283 default: 284 assert(0); /* Unreachable. */ 285 } 286 287 return 0; 288 } 289 290 void expr__del_id(struct expr_parse_ctx *ctx, const char *id) 291 { 292 struct expr_id_data *old_val = NULL; 293 char *old_key = NULL; 294 295 hashmap__delete(ctx->ids, id, &old_key, &old_val); 296 free(old_key); 297 free(old_val); 298 } 299 300 struct expr_parse_ctx *expr__ctx_new(void) 301 { 302 struct expr_parse_ctx *ctx; 303 304 ctx = calloc(1, sizeof(struct expr_parse_ctx)); 305 if (!ctx) 306 return NULL; 307 308 ctx->ids = hashmap__new(key_hash, key_equal, NULL); 309 if (IS_ERR(ctx->ids)) { 310 free(ctx); 311 return NULL; 312 } 313 314 return ctx; 315 } 316 317 void expr__ctx_clear(struct expr_parse_ctx *ctx) 318 { 319 struct hashmap_entry *cur; 320 size_t bkt; 321 322 hashmap__for_each_entry(ctx->ids, cur, bkt) { 323 zfree(&cur->pkey); 324 zfree(&cur->pvalue); 325 } 326 hashmap__clear(ctx->ids); 327 } 328 329 void expr__ctx_free(struct expr_parse_ctx *ctx) 330 { 331 struct hashmap_entry *cur; 332 size_t bkt; 333 334 if (!ctx) 335 return; 336 337 zfree(&ctx->sctx.user_requested_cpu_list); 338 hashmap__for_each_entry(ctx->ids, cur, bkt) { 339 zfree(&cur->pkey); 340 zfree(&cur->pvalue); 341 } 342 hashmap__free(ctx->ids); 343 free(ctx); 344 } 345 346 static int 347 __expr__parse(double *val, struct expr_parse_ctx *ctx, const char *expr, 348 bool compute_ids) 349 { 350 YY_BUFFER_STATE buffer; 351 void *scanner; 352 int ret; 353 354 pr_debug2("parsing metric: %s\n", expr); 355 356 ret = expr_lex_init_extra(&ctx->sctx, &scanner); 357 if (ret) 358 return ret; 359 360 buffer = expr__scan_string(expr, scanner); 361 362 #ifdef PARSER_DEBUG 363 expr_debug = 1; 364 expr_set_debug(1, scanner); 365 #endif 366 367 ret = expr_parse(val, ctx, compute_ids, scanner); 368 369 expr__flush_buffer(buffer, scanner); 370 expr__delete_buffer(buffer, scanner); 371 expr_lex_destroy(scanner); 372 return ret; 373 } 374 375 int expr__parse(double *final_val, struct expr_parse_ctx *ctx, 376 const char *expr) 377 { 378 return __expr__parse(final_val, ctx, expr, /*compute_ids=*/false) ? -1 : 0; 379 } 380 381 int expr__find_ids(const char *expr, const char *one, 382 struct expr_parse_ctx *ctx) 383 { 384 int ret = __expr__parse(NULL, ctx, expr, /*compute_ids=*/true); 385 386 if (one) 387 expr__del_id(ctx, one); 388 389 /* A positive value means syntax error, convert to -EINVAL */ 390 return ret > 0 ? -EINVAL : ret; 391 } 392 393 double expr_id_data__value(const struct expr_id_data *data) 394 { 395 if (data->kind == EXPR_ID_DATA__VALUE) 396 return data->val.val; 397 assert(data->kind == EXPR_ID_DATA__REF_VALUE); 398 return data->ref.val; 399 } 400 401 double expr_id_data__source_count(const struct expr_id_data *data) 402 { 403 if (data->kind == EXPR_ID_DATA__VALUE) 404 return data->val.source_count; 405 return 1.0; 406 } 407 408 double expr_id_data__aggr_nr(const struct expr_id_data *data) 409 { 410 if (data->kind == EXPR_ID_DATA__VALUE) 411 return data->val.aggr_nr; 412 return 1.0; 413 } 414 415 double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx) 416 { 417 double result = NAN; 418 enum tool_pmu_event ev = tool_pmu__str_to_event(literal + 1); 419 420 if (ev != TOOL_PMU__EVENT_NONE) { 421 u64 count; 422 423 if (tool_pmu__read_event(ev, /*evsel=*/NULL, 424 ctx->system_wide, ctx->user_requested_cpu_list, 425 &count)) 426 result = count; 427 else 428 pr_err("Failure to read '%s'\n", literal); 429 } else { 430 pr_err("Unrecognized literal '%s'\n", literal); 431 } 432 433 pr_debug2("literal: %s = %f\n", literal, result); 434 return result; 435 } 436 437 /* Does the event 'id' parse? Determine via ctx->ids if possible. */ 438 double expr__has_event(const struct expr_parse_ctx *ctx, bool compute_ids, const char *id) 439 { 440 struct evlist *tmp; 441 double ret; 442 443 if (hashmap__find(ctx->ids, id, /*value=*/NULL)) 444 return 1.0; 445 446 if (!compute_ids) 447 return 0.0; 448 449 tmp = evlist__new(); 450 if (!tmp) 451 return NAN; 452 453 if (strchr(id, '@')) { 454 char *tmp_id, *p; 455 456 tmp_id = strdup(id); 457 if (!tmp_id) { 458 ret = NAN; 459 goto out; 460 } 461 p = strchr(tmp_id, '@'); 462 *p = '/'; 463 p = strrchr(tmp_id, '@'); 464 *p = '/'; 465 ret = parse_event(tmp, tmp_id) ? 0 : 1; 466 free(tmp_id); 467 } else { 468 ret = parse_event(tmp, id) ? 0 : 1; 469 } 470 out: 471 evlist__delete(tmp); 472 return ret; 473 } 474 475 double expr__strcmp_cpuid_str(const struct expr_parse_ctx *ctx __maybe_unused, 476 bool compute_ids __maybe_unused, const char *test_id) 477 { 478 double ret; 479 struct perf_cpu cpu = {-1}; 480 char *cpuid = get_cpuid_allow_env_override(cpu); 481 482 if (!cpuid) 483 return NAN; 484 485 ret = !strcmp_cpuid_str(test_id, cpuid); 486 487 free(cpuid); 488 return ret; 489 } 490