linux-kernel - [PATCH 18/18] perf/x86/intel/cstate: Support multi-die/package

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Date:   Wed,  1 May 2019 00:24:27 -0400
From:   Len Brown <lenb@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Len Brown <len.brown@...el.com>
Subject: [PATCH 18/18] perf/x86/intel/cstate: Support multi-die/package

From: Kan Liang <kan.liang@...ux.intel.com>

Some cstate counters becomes die-scope on Xeon Cascade Lake-AP. Perf
cstate driver needs to support die-scope cstate counters.

Use topology_die_cpumask() to replace topology_core_cpumask().
For previous platforms which doesn't have multi-die,
topology_die_cpumask() is identical as topology_core_cpumask().
There is no functional change for previous platforms.

Name the die-scope PMU "cstate_die".

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 arch/x86/events/intel/cstate.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index 94a4b7fc75d0..52c5fea29457 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -302,7 +302,7 @@ static int cstate_pmu_event_init(struct perf_event *event)
 			return -EINVAL;
 		event->hw.event_base = pkg_msr[cfg].msr;
 		cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
-				      topology_core_cpumask(event->cpu));
+				      topology_die_cpumask(event->cpu));
 	} else {
 		return -ENOENT;
 	}
@@ -385,7 +385,7 @@ static int cstate_cpu_exit(unsigned int cpu)
 	if (has_cstate_pkg &&
 	    cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) {
 
-		target = cpumask_any_but(topology_core_cpumask(cpu), cpu);
+		target = cpumask_any_but(topology_die_cpumask(cpu), cpu);
 		/* Migrate events if there is a valid target */
 		if (target < nr_cpu_ids) {
 			cpumask_set_cpu(target, &cstate_pkg_cpu_mask);
@@ -414,7 +414,7 @@ static int cstate_cpu_init(unsigned int cpu)
 	 * in the package cpu mask as the designated reader.
 	 */
 	target = cpumask_any_and(&cstate_pkg_cpu_mask,
-				 topology_core_cpumask(cpu));
+				 topology_die_cpumask(cpu));
 	if (has_cstate_pkg && target >= nr_cpu_ids)
 		cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
 
@@ -661,7 +661,13 @@ static int __init cstate_init(void)
 	}
 
 	if (has_cstate_pkg) {
-		err = perf_pmu_register(&cstate_pkg_pmu, cstate_pkg_pmu.name, -1);
+		if (topology_max_die_per_package() > 1) {
+			err = perf_pmu_register(&cstate_pkg_pmu,
+						"cstate_die", -1);
+		} else {
+			err = perf_pmu_register(&cstate_pkg_pmu,
+						cstate_pkg_pmu.name, -1);
+		}
 		if (err) {
 			has_cstate_pkg = false;
 			pr_info("Failed to register cstate pkg pmu\n");
-- 
2.18.0-rc0