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