summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/expr.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/expr.c')
-rw-r--r--tools/perf/util/expr.c522
1 files changed, 522 insertions, 0 deletions
diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
new file mode 100644
index 0000000000..4488f306de
--- /dev/null
+++ b/tools/perf/util/expr.c
@@ -0,0 +1,522 @@
+// 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;
+}