linux-kernel - [RFC][PATCH 7/5] perf/x86/intel: Remove x86_pmu::update_topdown

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Date:   Wed, 11 May 2022 17:35:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, kan.liang@...ux.intel.com, eranian@...gle.com
Cc:     linux-kernel@...r.kernel.org, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org
Subject: [RFC][PATCH 7/5] perf/x86/intel: Remove x86_pmu::update_topdown_event


Subject: perf/x86/intel: Remove x86_pmu::update_topdown_event
From: Peter Zijlstra <peterz@...radead.org>
Date: Wed May 11 17:02:05 CEST 2022

Not that it is all internal to the intel driver, remove
x86_pmu::update_topdown_event.

Assumes that is_topdown_count(event) can only be true when the
hardware has topdown stuff and the function is set.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/events/intel/core.c |   22 ++++++++++++----------
 arch/x86/events/perf_event.h |    1 -
 2 files changed, 12 insertions(+), 11 deletions(-)

--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2672,6 +2672,7 @@ static u64 adl_update_topdown_event(stru
 	return icl_update_topdown_event(event);
 }
 
+DEFINE_STATIC_CALL(intel_pmu_update_topdown_event, x86_perf_event_update);
 
 static void intel_pmu_read_topdown_event(struct perf_event *event)
 {
@@ -2683,7 +2684,7 @@ static void intel_pmu_read_topdown_event
 		return;
 
 	perf_pmu_disable(event->pmu);
-	x86_pmu.update_topdown_event(event);
+	static_call(intel_pmu_update_topdown_event)(event);
 	perf_pmu_enable(event->pmu);
 }
 
@@ -2691,7 +2692,7 @@ static void intel_pmu_read_event(struct
 {
 	if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)
 		intel_pmu_auto_reload_read(event);
-	else if (is_topdown_count(event) && x86_pmu.update_topdown_event)
+	else if (is_topdown_count(event))
 		intel_pmu_read_topdown_event(event);
 	else
 		x86_perf_event_update(event);
@@ -2820,9 +2821,8 @@ static int intel_pmu_set_period(struct p
 
 static u64 intel_pmu_update(struct perf_event *event)
 {
-	if (unlikely(is_topdown_count(event)) &&
-	    x86_pmu.update_topdown_event)
-		return x86_pmu.update_topdown_event(event);
+	if (unlikely(is_topdown_count(event)))
+		return static_call(intel_pmu_update_topdown_event)(event);
 
 	return x86_perf_event_update(event);
 }
@@ -2950,8 +2950,7 @@ static int handle_pmi_common(struct pt_r
 	 */
 	if (__test_and_clear_bit(GLOBAL_STATUS_PERF_METRICS_OVF_BIT, (unsigned long *)&status)) {
 		handled++;
-		if (x86_pmu.update_topdown_event)
-			x86_pmu.update_topdown_event(NULL);
+		static_call(intel_pmu_update_topdown_event)(NULL);
 	}
 
 	/*
@@ -6191,7 +6190,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.lbr_pt_coexist = true;
 		intel_pmu_pebs_data_source_skl(pmem);
 		x86_pmu.num_topdown_events = 4;
-		x86_pmu.update_topdown_event = icl_update_topdown_event;
+		static_call_update(intel_pmu_update_topdown_event,
+				   &icl_update_topdown_event);
 		static_call_update(intel_pmu_set_topdown_event_period,
 				   &icl_set_topdown_event_period);
 		pr_cont("Icelake events, ");
@@ -6229,7 +6229,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.lbr_pt_coexist = true;
 		intel_pmu_pebs_data_source_skl(pmem);
 		x86_pmu.num_topdown_events = 8;
-		x86_pmu.update_topdown_event = icl_update_topdown_event;
+		static_call_update(intel_pmu_update_topdown_event,
+				   &icl_update_topdown_event);
 		static_call_update(intel_pmu_set_topdown_event_period,
 				   &icl_set_topdown_event_period);
 		pr_cont("Sapphire Rapids events, ");
@@ -6263,7 +6264,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.lbr_pt_coexist = true;
 		intel_pmu_pebs_data_source_skl(false);
 		x86_pmu.num_topdown_events = 8;
-		x86_pmu.update_topdown_event = adl_update_topdown_event;
+		static_call_update(intel_pmu_update_topdown_event,
+				   &adl_update_topdown_event);
 		static_call_update(intel_pmu_set_topdown_event_period,
 				   &adl_set_topdown_event_period);
 
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -878,7 +878,6 @@ struct x86_pmu {
 	 * Intel perf metrics
 	 */
 	int		num_topdown_events;
-	u64		(*update_topdown_event)(struct perf_event *event);
 
 	/*
 	 * perf task context (i.e. struct perf_event_context::task_ctx_data)