perf evlist: Remove __evlist__add_default

__evlist__add_default adds a cycles event to a typically empty evlist
and was extended for hybrid with evlist__add_default_hybrid, as more
than 1 PMU was necessary. Rather than have dedicated logic for the
cycles event, this change switches to parsing 'cycles:P' which will
handle wildcarding the PMUs appropriately for hybrid.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230527072210.2900565-14-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/evsel.c

@@ -16,26 +16,6 @@ void arch_evsel__set_sample_weight(struct evsel *evsel)
 	evsel__set_sample_bit(evsel, WEIGHT_STRUCT);
 }
 
-void arch_evsel__fixup_new_cycles(struct perf_event_attr *attr)
-{
-	struct perf_env env = { .total_mem = 0, } ;
-
-	if (!perf_env__cpuid(&env))
-		return;
-
-	/*
-	 * On AMD, precise cycles event sampling internally uses IBS pmu.
-	 * But IBS does not have filtering capabilities and perf by default
-	 * sets exclude_guest = 1. This makes IBS pmu event init fail and
-	 * thus perf ends up doing non-precise sampling. Avoid it by clearing
-	 * exclude_guest.
-	 */
-	if (env.cpuid && strstarts(env.cpuid, "AuthenticAMD"))
-		attr->exclude_guest = 0;
-
-	free(env.cpuid);
-}
-
 /* Check whether the evsel's PMU supports the perf metrics */
 bool evsel__sys_has_perf_metrics(const struct evsel *evsel)
 {

tools/perf/builtin-record.c

@@ -4161,18 +4161,11 @@ int cmd_record(int argc, const char **argv)
 		record.opts.tail_synthesize = true;
 
 	if (rec->evlist->core.nr_entries == 0) {
-		if (perf_pmu__has_hybrid()) {
+		bool can_profile_kernel = perf_event_paranoid_check(1);
-			err = evlist__add_default_hybrid(rec->evlist,
-							 !record.opts.no_samples);
-		} else {
-			err = __evlist__add_default(rec->evlist,
-						    !record.opts.no_samples);
-		}
 
-		if (err < 0) {
+		err = parse_event(rec->evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
-			pr_err("Not enough memory for event selector list\n");
+		if (err)
 			goto out;
-		}
 	}
 
 	if (rec->opts.target.tid && !rec->opts.no_inherit_set)

tools/perf/builtin-top.c

@@ -1653,10 +1653,12 @@ int cmd_top(int argc, const char **argv)
 	if (annotate_check_args(&top.annotation_opts) < 0)
 		goto out_delete_evlist;
 
-	if (!top.evlist->core.nr_entries &&
+	if (!top.evlist->core.nr_entries) {
-	    evlist__add_default(top.evlist) < 0) {
+		bool can_profile_kernel = perf_event_paranoid_check(1);
-		pr_err("Not enough memory for event selector list\n");
+		int err = parse_event(top.evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
-		goto out_delete_evlist;
+
+		if (err)
+			goto out_delete_evlist;
 	}
 
 	status = evswitch__init(&top.evswitch, top.evlist, stderr);

tools/perf/util/evlist-hybrid.c

@@ -16,31 +16,6 @@
 #include <perf/evsel.h>
 #include <perf/cpumap.h>
 
-int evlist__add_default_hybrid(struct evlist *evlist, bool precise)
-{
-	struct evsel *evsel;
-	struct perf_pmu *pmu;
-	__u64 config;
-	struct perf_cpu_map *cpus;
-
-	perf_pmu__for_each_hybrid_pmu(pmu) {
-		config = PERF_COUNT_HW_CPU_CYCLES |
-			 ((__u64)pmu->type << PERF_PMU_TYPE_SHIFT);
-		evsel = evsel__new_cycles(precise, PERF_TYPE_HARDWARE,
-					  config);
-		if (!evsel)
-			return -ENOMEM;
-
-		cpus = perf_cpu_map__get(pmu->cpus);
-		evsel->core.cpus = cpus;
-		evsel->core.own_cpus = perf_cpu_map__get(cpus);
-		evsel->pmu_name = strdup(pmu->name);
-		evlist__add(evlist, evsel);
-	}
-
-	return 0;
-}
-
 bool evlist__has_hybrid(struct evlist *evlist)
 {
 	struct evsel *evsel;

tools/perf/util/evlist-hybrid.h

@@ -7,7 +7,6 @@
 #include "evlist.h"
 #include <unistd.h>
 
-int evlist__add_default_hybrid(struct evlist *evlist, bool precise);
 bool evlist__has_hybrid(struct evlist *evlist);
 
 #endif /* __PERF_EVLIST_HYBRID_H */

tools/perf/util/evlist.c

@@ -93,8 +93,15 @@ struct evlist *evlist__new(void)
 struct evlist *evlist__new_default(void)
 {
 	struct evlist *evlist = evlist__new();
+	bool can_profile_kernel;
+	int err;
 
-	if (evlist && evlist__add_default(evlist)) {
+	if (!evlist)
+		return NULL;
+
+	can_profile_kernel = perf_event_paranoid_check(1);
+	err = parse_event(evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
+	if (err) {
 		evlist__delete(evlist);
 		evlist = NULL;
 	}
@@ -237,19 +244,6 @@ static void evlist__set_leader(struct evlist *evlist)
 	perf_evlist__set_leader(&evlist->core);
 }
 
-int __evlist__add_default(struct evlist *evlist, bool precise)
-{
-	struct evsel *evsel;
-
-	evsel = evsel__new_cycles(precise, PERF_TYPE_HARDWARE,
-				  PERF_COUNT_HW_CPU_CYCLES);
-	if (evsel == NULL)
-		return -ENOMEM;
-
-	evlist__add(evlist, evsel);
-	return 0;
-}
-
 static struct evsel *evlist__dummy_event(struct evlist *evlist)
 {
 	struct perf_event_attr attr = {

tools/perf/util/evlist.h

@@ -100,13 +100,6 @@ void evlist__delete(struct evlist *evlist);
 void evlist__add(struct evlist *evlist, struct evsel *entry);
 void evlist__remove(struct evlist *evlist, struct evsel *evsel);
 
-int __evlist__add_default(struct evlist *evlist, bool precise);
-
-static inline int evlist__add_default(struct evlist *evlist)
-{
-	return __evlist__add_default(evlist, true);
-}
-
 int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs);
 
 int __evlist__add_default_attrs(struct evlist *evlist,

tools/perf/util/evsel.c

@@ -316,48 +316,6 @@ struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
 	return evsel;
 }
 
-static bool perf_event_can_profile_kernel(void)
-{
-	return perf_event_paranoid_check(1);
-}
-
-struct evsel *evsel__new_cycles(bool precise __maybe_unused, __u32 type, __u64 config)
-{
-	struct perf_event_attr attr = {
-		.type	= type,
-		.config	= config,
-		.exclude_kernel	= !perf_event_can_profile_kernel(),
-	};
-	struct evsel *evsel;
-
-	event_attr_init(&attr);
-
-	/*
-	 * Now let the usual logic to set up the perf_event_attr defaults
-	 * to kick in when we return and before perf_evsel__open() is called.
-	 */
-	evsel = evsel__new(&attr);
-	if (evsel == NULL)
-		goto out;
-
-	arch_evsel__fixup_new_cycles(&evsel->core.attr);
-
-	evsel->precise_max = true;
-
-	/* use asprintf() because free(evsel) assumes name is allocated */
-	if (asprintf(&evsel->name, "cycles%s%s%.*s",
-		     (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
-		     attr.exclude_kernel ? "u" : "",
-		     attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
-		goto error_free;
-out:
-	return evsel;
-error_free:
-	evsel__delete(evsel);
-	evsel = NULL;
-	goto out;
-}
-
 int copy_config_terms(struct list_head *dst, struct list_head *src)
 {
 	struct evsel_config_term *pos, *tmp;
@@ -1131,10 +1089,6 @@ void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
 	evsel__set_sample_bit(evsel, WEIGHT);
 }
 
-void __weak arch_evsel__fixup_new_cycles(struct perf_event_attr *attr __maybe_unused)
-{
-}
-
 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
 				    struct perf_event_attr *attr __maybe_unused)
 {

tools/perf/util/evsel.h

@@ -243,8 +243,6 @@ static inline struct evsel *evsel__newtp(const char *sys, const char *name)
 }
 #endif
 
-struct evsel *evsel__new_cycles(bool precise, __u32 type, __u64 config);
-
 #ifdef HAVE_LIBTRACEEVENT
 struct tep_event *event_format__new(const char *sys, const char *name);
 #endif
@@ -312,7 +310,6 @@ void __evsel__reset_sample_bit(struct evsel *evsel, enum perf_event_sample_forma
 void evsel__set_sample_id(struct evsel *evsel, bool use_sample_identifier);
 
 void arch_evsel__set_sample_weight(struct evsel *evsel);
-void arch_evsel__fixup_new_cycles(struct perf_event_attr *attr);
 void arch__post_evsel_config(struct evsel *evsel, struct perf_event_attr *attr);
 
 int evsel__set_filter(struct evsel *evsel, const char *filter);

tools/perf/util/python.c

@@ -49,6 +49,14 @@
 #define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
 #endif
 
+/*
+ * Avoid bringing in event parsing.
+ */
+int parse_event(struct evlist *evlist __maybe_unused, const char *str __maybe_unused)
+{
+	return 0;
+}
+
 /*
  * Provide these two so that we don't have to link against callchain.c and
  * start dragging hist.c, etc.