summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/expr.c
blob: 4488f306de7853daaf145fbe5a52c8ad271de6f1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
// SPDX-License-Identifier: GPL-2.0
#include <stdbool.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "metricgroup.h"
#include "cpumap.h"
#include "cputopo.h"
#include "debug.h"
#include "evlist.h"
#include "expr.h"
#include <util/expr-bison.h>
#include <util/expr-flex.h>
#include "util/hashmap.h"
#include "util/header.h"
#include "util/pmu.h"
#include "smt.h"
#include "tsc.h"
#include <api/fs/fs.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/zalloc.h>
#include <ctype.h>
#include <math.h>
#include "pmu.h"

#ifdef PARSER_DEBUG
extern int expr_debug;
#endif

struct expr_id_data {
	union {
		struct {
			double val;
			int source_count;
		} val;
		struct {
			double val;
			const char *metric_name;
			const char *metric_expr;
		} ref;
	};

	enum {
		/* Holding a double value. */
		EXPR_ID_DATA__VALUE,
		/* Reference to another metric. */
		EXPR_ID_DATA__REF,
		/* A reference but the value has been computed. */
		EXPR_ID_DATA__REF_VALUE,
	} kind;
};

static size_t key_hash(long key, void *ctx __maybe_unused)
{
	const char *str = (const char *)key;
	size_t hash = 0;

	while (*str != '\0') {
		hash *= 31;
		hash += *str;
		str++;
	}
	return hash;
}

static bool key_equal(long key1, long key2, void *ctx __maybe_unused)
{
	return !strcmp((const char *)key1, (const char *)key2);
}

struct hashmap *ids__new(void)
{
	struct hashmap *hash;

	hash = hashmap__new(key_hash, key_equal, NULL);
	if (IS_ERR(hash))
		return NULL;
	return hash;
}

void ids__free(struct hashmap *ids)
{
	struct hashmap_entry *cur;
	size_t bkt;

	if (ids == NULL)
		return;

	hashmap__for_each_entry(ids, cur, bkt) {
		zfree(&cur->pkey);
		zfree(&cur->pvalue);
	}

	hashmap__free(ids);
}

int ids__insert(struct hashmap *ids, const char *id)
{
	struct expr_id_data *data_ptr = NULL, *old_data = NULL;
	char *old_key = NULL;
	int ret;

	ret = hashmap__set(ids, id, data_ptr, &old_key, &old_data);
	if (ret)
		free(data_ptr);
	free(old_key);
	free(old_data);
	return ret;
}

struct hashmap *ids__union(struct hashmap *ids1, struct hashmap *ids2)
{
	size_t bkt;
	struct hashmap_entry *cur;
	int ret;
	struct expr_id_data *old_data = NULL;
	char *old_key = NULL;

	if (!ids1)
		return ids2;

	if (!ids2)
		return ids1;

	if (hashmap__size(ids1) <  hashmap__size(ids2)) {
		struct hashmap *tmp = ids1;

		ids1 = ids2;
		ids2 = tmp;
	}
	hashmap__for_each_entry(ids2, cur, bkt) {
		ret = hashmap__set(ids1, cur->key, cur->value, &old_key, &old_data);
		free(old_key);
		free(old_data);

		if (ret) {
			hashmap__free(ids1);
			hashmap__free(ids2);
			return NULL;
		}
	}
	hashmap__free(ids2);
	return ids1;
}

/* Caller must make sure id is allocated */
int expr__add_id(struct expr_parse_ctx *ctx, const char *id)
{
	return ids__insert(ctx->ids, id);
}

/* Caller must make sure id is allocated */
int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val)
{
	return expr__add_id_val_source_count(ctx, id, val, /*source_count=*/1);
}

/* Caller must make sure id is allocated */
int expr__add_id_val_source_count(struct expr_parse_ctx *ctx, const char *id,
				  double val, int source_count)
{
	struct expr_id_data *data_ptr = NULL, *old_data = NULL;
	char *old_key = NULL;
	int ret;

	data_ptr = malloc(sizeof(*data_ptr));
	if (!data_ptr)
		return -ENOMEM;
	data_ptr->val.val = val;
	data_ptr->val.source_count = source_count;
	data_ptr->kind = EXPR_ID_DATA__VALUE;

	ret = hashmap__set(ctx->ids, id, data_ptr, &old_key, &old_data);
	if (ret)
		free(data_ptr);
	free(old_key);
	free(old_data);
	return ret;
}

int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref)
{
	struct expr_id_data *data_ptr = NULL, *old_data = NULL;
	char *old_key = NULL;
	char *name;
	int ret;

	data_ptr = zalloc(sizeof(*data_ptr));
	if (!data_ptr)
		return -ENOMEM;

	name = strdup(ref->metric_name);
	if (!name) {
		free(data_ptr);
		return -ENOMEM;
	}

	/*
	 * Intentionally passing just const char pointers,
	 * originally from 'struct pmu_event' object.
	 * We don't need to change them, so there's no
	 * need to create our own copy.
	 */
	data_ptr->ref.metric_name = ref->metric_name;
	data_ptr->ref.metric_expr = ref->metric_expr;
	data_ptr->kind = EXPR_ID_DATA__REF;

	ret = hashmap__set(ctx->ids, name, data_ptr, &old_key, &old_data);
	if (ret)
		free(data_ptr);

	pr_debug2("adding ref metric %s: %s\n",
		  ref->metric_name, ref->metric_expr);

	free(old_key);
	free(old_data);
	return ret;
}

int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
		 struct expr_id_data **data)
{
	return hashmap__find(ctx->ids, id, data) ? 0 : -1;
}

bool expr__subset_of_ids(struct expr_parse_ctx *haystack,
			 struct expr_parse_ctx *needles)
{
	struct hashmap_entry *cur;
	size_t bkt;
	struct expr_id_data *data;

	hashmap__for_each_entry(needles->ids, cur, bkt) {
		if (expr__get_id(haystack, cur->pkey, &data))
			return false;
	}
	return true;
}


int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
		     struct expr_id_data **datap)
{
	struct expr_id_data *data;

	if (expr__get_id(ctx, id, datap) || !*datap) {
		pr_debug("%s not found\n", id);
		return -1;
	}

	data = *datap;

	switch (data->kind) {
	case EXPR_ID_DATA__VALUE:
		pr_debug2("lookup(%s): val %f\n", id, data->val.val);
		break;
	case EXPR_ID_DATA__REF:
		pr_debug2("lookup(%s): ref metric name %s\n", id,
			data->ref.metric_name);
		pr_debug("processing metric: %s ENTRY\n", id);
		data->kind = EXPR_ID_DATA__REF_VALUE;
		if (expr__parse(&data->ref.val, ctx, data->ref.metric_expr)) {
			pr_debug("%s failed to count\n", id);
			return -1;
		}
		pr_debug("processing metric: %s EXIT: %f\n", id, data->ref.val);
		break;
	case EXPR_ID_DATA__REF_VALUE:
		pr_debug2("lookup(%s): ref val %f metric name %s\n", id,
			data->ref.val, data->ref.metric_name);
		break;
	default:
		assert(0);  /* Unreachable. */
	}

	return 0;
}

void expr__del_id(struct expr_parse_ctx *ctx, const char *id)
{
	struct expr_id_data *old_val = NULL;
	char *old_key = NULL;

	hashmap__delete(ctx->ids, id, &old_key, &old_val);
	free(old_key);
	free(old_val);
}

struct expr_parse_ctx *expr__ctx_new(void)
{
	struct expr_parse_ctx *ctx;

	ctx = malloc(sizeof(struct expr_parse_ctx));
	if (!ctx)
		return NULL;

	ctx->ids = hashmap__new(key_hash, key_equal, NULL);
	if (IS_ERR(ctx->ids)) {
		free(ctx);
		return NULL;
	}
	ctx->sctx.user_requested_cpu_list = NULL;
	ctx->sctx.runtime = 0;
	ctx->sctx.system_wide = false;

	return ctx;
}

void expr__ctx_clear(struct expr_parse_ctx *ctx)
{
	struct hashmap_entry *cur;
	size_t bkt;

	hashmap__for_each_entry(ctx->ids, cur, bkt) {
		zfree(&cur->pkey);
		zfree(&cur->pvalue);
	}
	hashmap__clear(ctx->ids);
}

void expr__ctx_free(struct expr_parse_ctx *ctx)
{
	struct hashmap_entry *cur;
	size_t bkt;

	if (!ctx)
		return;

	zfree(&ctx->sctx.user_requested_cpu_list);
	hashmap__for_each_entry(ctx->ids, cur, bkt) {
		zfree(&cur->pkey);
		zfree(&cur->pvalue);
	}
	hashmap__free(ctx->ids);
	free(ctx);
}

static int
__expr__parse(double *val, struct expr_parse_ctx *ctx, const char *expr,
	      bool compute_ids)
{
	YY_BUFFER_STATE buffer;
	void *scanner;
	int ret;

	pr_debug2("parsing metric: %s\n", expr);

	ret = expr_lex_init_extra(&ctx->sctx, &scanner);
	if (ret)
		return ret;

	buffer = expr__scan_string(expr, scanner);

#ifdef PARSER_DEBUG
	expr_debug = 1;
	expr_set_debug(1, scanner);
#endif

	ret = expr_parse(val, ctx, compute_ids, scanner);

	expr__flush_buffer(buffer, scanner);
	expr__delete_buffer(buffer, scanner);
	expr_lex_destroy(scanner);
	return ret;
}

int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
		const char *expr)
{
	return __expr__parse(final_val, ctx, expr, /*compute_ids=*/false) ? -1 : 0;
}

int expr__find_ids(const char *expr, const char *one,
		   struct expr_parse_ctx *ctx)
{
	int ret = __expr__parse(NULL, ctx, expr, /*compute_ids=*/true);

	if (one)
		expr__del_id(ctx, one);

	return ret;
}

double expr_id_data__value(const struct expr_id_data *data)
{
	if (data->kind == EXPR_ID_DATA__VALUE)
		return data->val.val;
	assert(data->kind == EXPR_ID_DATA__REF_VALUE);
	return data->ref.val;
}

double expr_id_data__source_count(const struct expr_id_data *data)
{
	assert(data->kind == EXPR_ID_DATA__VALUE);
	return data->val.source_count;
}

#if !defined(__i386__) && !defined(__x86_64__)
double arch_get_tsc_freq(void)
{
	return 0.0;
}
#endif

static double has_pmem(void)
{
	static bool has_pmem, cached;
	const char *sysfs = sysfs__mountpoint();
	char path[PATH_MAX];

	if (!cached) {
		snprintf(path, sizeof(path), "%s/firmware/acpi/tables/NFIT", sysfs);
		has_pmem = access(path, F_OK) == 0;
		cached = true;
	}
	return has_pmem ? 1.0 : 0.0;
}

double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx)
{
	const struct cpu_topology *topology;
	double result = NAN;

	if (!strcmp("#num_cpus", literal)) {
		result = cpu__max_present_cpu().cpu;
		goto out;
	}
	if (!strcmp("#num_cpus_online", literal)) {
		struct perf_cpu_map *online = cpu_map__online();

		if (online)
			result = perf_cpu_map__nr(online);
		goto out;
	}

	if (!strcasecmp("#system_tsc_freq", literal)) {
		result = arch_get_tsc_freq();
		goto out;
	}

	/*
	 * Assume that topology strings are consistent, such as CPUs "0-1"
	 * wouldn't be listed as "0,1", and so after deduplication the number of
	 * these strings gives an indication of the number of packages, dies,
	 * etc.
	 */
	if (!strcasecmp("#smt_on", literal)) {
		result = smt_on() ? 1.0 : 0.0;
		goto out;
	}
	if (!strcmp("#core_wide", literal)) {
		result = core_wide(ctx->system_wide, ctx->user_requested_cpu_list)
			? 1.0 : 0.0;
		goto out;
	}
	if (!strcmp("#num_packages", literal)) {
		topology = online_topology();
		result = topology->package_cpus_lists;
		goto out;
	}
	if (!strcmp("#num_dies", literal)) {
		topology = online_topology();
		result = topology->die_cpus_lists;
		goto out;
	}
	if (!strcmp("#num_cores", literal)) {
		topology = online_topology();
		result = topology->core_cpus_lists;
		goto out;
	}
	if (!strcmp("#slots", literal)) {
		result = perf_pmu__cpu_slots_per_cycle();
		goto out;
	}
	if (!strcmp("#has_pmem", literal)) {
		result = has_pmem();
		goto out;
	}

	pr_err("Unrecognized literal '%s'", literal);
out:
	pr_debug2("literal: %s = %f\n", literal, result);
	return result;
}

/* Does the event 'id' parse? Determine via ctx->ids if possible. */
double expr__has_event(const struct expr_parse_ctx *ctx, bool compute_ids, const char *id)
{
	struct evlist *tmp;
	double ret;

	if (hashmap__find(ctx->ids, id, /*value=*/NULL))
		return 1.0;

	if (!compute_ids)
		return 0.0;

	tmp = evlist__new();
	if (!tmp)
		return NAN;
	ret = parse_event(tmp, id) ? 0 : 1;
	evlist__delete(tmp);
	return ret;
}

double expr__strcmp_cpuid_str(const struct expr_parse_ctx *ctx __maybe_unused,
		       bool compute_ids __maybe_unused, const char *test_id)
{
	double ret;
	struct perf_pmu *pmu = pmu__find_core_pmu();
	char *cpuid = perf_pmu__getcpuid(pmu);

	if (!cpuid)
		return NAN;

	ret = !strcmp_cpuid_str(test_id, cpuid);

	free(cpuid);
	return ret;
}