1 files changed, 461 insertions, 0 deletions
diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
new file mode 100644
index 000000000..aaacf514d
--- /dev/null
+++ b/tools/perf/util/expr.c
@@ -0,0 +1,461 @@
+// 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 "expr.h"
+#include "expr-bison.h"
+#include "expr-flex.h"
+#include "smt.h"
+#include "tsc.h"
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/zalloc.h>
+#include <ctype.h>
+#include <math.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(const void *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(const void *key1, const void *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) {
+		free((char *)cur->key);
+		free(cur->value);
+	}
+
+	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,
+			   (const void **)&old_key, (void **)&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,
+				(const void **)&old_key, (void **)&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,
+			   (const void **)&old_key, (void **)&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,
+			   (const void **)&old_key, (void **)&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, (void **)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->key, &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,
+			(const void **)&old_key, (void **)&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) {
+		free((char *)cur->key);
+		free(cur->value);
+	}
+	hashmap__clear(ctx->ids);
+}
+
+void expr__ctx_free(struct expr_parse_ctx *ctx)
+{
+	struct hashmap_entry *cur;
+	size_t bkt;
+
+	if (!ctx)
+		return;
+
+	free(ctx->sctx.user_requested_cpu_list);
+	hashmap__for_each_entry(ctx->ids, cur, bkt) {
+		free((char *)cur->key);
+		free(cur->value);
+	}
+	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
+
+double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx)
+{
+	static struct cpu_topology *topology;
+	double result = NAN;
+
+	if (!strcmp("#num_cpus", literal)) {
+		result = cpu__max_present_cpu().cpu;
+		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 (!topology) {
+		topology = cpu_topology__new();
+		if (!topology) {
+			pr_err("Error creating CPU topology");
+			goto out;
+		}
+	}
+	if (!strcasecmp("#smt_on", literal)) {
+		result = smt_on(topology) ? 1.0 : 0.0;
+		goto out;
+	}
+	if (!strcmp("#core_wide", literal)) {
+		result = core_wide(ctx->system_wide, ctx->user_requested_cpu_list, topology)
+			? 1.0 : 0.0;
+		goto out;
+	}
+	if (!strcmp("#num_packages", literal)) {
+		result = topology->package_cpus_lists;
+		goto out;
+	}
+	if (!strcmp("#num_dies", literal)) {
+		result = topology->die_cpus_lists;
+		goto out;
+	}
+	if (!strcmp("#num_cores", literal)) {
+		result = topology->core_cpus_lists;
+		goto out;
+	}
+
+	pr_err("Unrecognized literal '%s'", literal);
+out:
+	pr_debug2("literal: %s = %f\n", literal, result);
+	return result;
+}