perf stat: Implement --topdown using json metrics

Request the topdown metric group of a level with the metrics in the
group 'TopdownL<level>' rather than through specific events. As more
topdown levels are supported this way, such as 6 on Intel Ice Lake,
default to just showing the level 1 metrics. This can be overridden
using '--td-level'. Rather than determine the maximum topdown level
from sysfs, use the metric group names. Remove some now unused topdown
code.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
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: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Link: https://lore.kernel.org/r/20230219092848.639226-41-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 1 insertions, 47 deletions

diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c
index eb3a7d9652ab..9ad5e5c7bd27 100644
--- a/tools/perf/arch/x86/util/topdown.c
+++ b/tools/perf/arch/x86/util/topdown.c
@@ -1,11 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <stdio.h>
 #include "api/fs/fs.h"
+#include "util/evsel.h"
 #include "util/pmu.h"
 #include "util/topdown.h"
-#include "util/evlist.h"
-#include "util/debug.h"
-#include "util/pmu-hybrid.h"
 #include "topdown.h"
 #include "evsel.h"
 
@@ -33,30 +30,6 @@ bool topdown_sys_has_perf_metrics(void)
 	return has_perf_metrics;
 }
 
-/*
- * Check whether we can use a group for top down.
- * Without a group may get bad results due to multiplexing.
- */
-bool arch_topdown_check_group(bool *warn)
-{
-	int n;
-
-	if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0)
-		return false;
-	if (n > 0) {
-		*warn = true;
-		return false;
-	}
-	return true;
-}
-
-void arch_topdown_group_warn(void)
-{
-	fprintf(stderr,
-		"nmi_watchdog enabled with topdown. May give wrong results.\n"
-		"Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n");
-}
-
 #define TOPDOWN_SLOTS		0x0400
 
 /*
@@ -65,7 +38,6 @@ void arch_topdown_group_warn(void)
  * Only Topdown metric supports sample-read. The slots
  * event must be the leader of the topdown group.
  */
-
 bool arch_topdown_sample_read(struct evsel *leader)
 {
 	if (!evsel__sys_has_perf_metrics(leader))
@@ -76,21 +48,3 @@ bool arch_topdown_sample_read(struct evsel *leader)
 
 	return false;
 }
-
-const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn)
-{
-	const char *pmu_name;
-
-	if (!perf_pmu__has_hybrid())
-		return "cpu";
-
-	if (!evlist->hybrid_pmu_name) {
-		if (warn)
-			pr_warning("WARNING: default to use cpu_core topdown events\n");
-		evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core");
-	}
-
-	pmu_name = evlist->hybrid_pmu_name;
-
-	return pmu_name;
-}