linux-kernel - [PATCH v2 2/9] perf/x86/intel: Move the topdown stuff into the intel driver

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Message-ID: <20220829101321.505933457@infradead.org>
Date:   Mon, 29 Aug 2022 12:10:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, kan.liang@...ux.intel.com, eranian@...gle.com,
        ravi.bangoria@....com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org
Subject: [PATCH v2 2/9] perf/x86/intel: Move the topdown stuff into the intel driver

Use the new x86_pmu::{set_period,update}() methods to push the topdown
stuff into the Intel driver, where it belongs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/events/core.c       |    7 -------
 arch/x86/events/intel/core.c |   28 +++++++++++++++++++++++++---
 2 files changed, 25 insertions(+), 10 deletions(-)

--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -119,9 +119,6 @@ u64 x86_perf_event_update(struct perf_ev
 	if (unlikely(!hwc->event_base))
 		return 0;
 
-	if (unlikely(is_topdown_count(event)) && x86_pmu.update_topdown_event)
-		return x86_pmu.update_topdown_event(event);
-
 	/*
 	 * Careful: an NMI might modify the previous event value.
 	 *
@@ -1373,10 +1370,6 @@ int x86_perf_event_set_period(struct per
 	if (unlikely(!hwc->event_base))
 		return 0;
 
-	if (unlikely(is_topdown_count(event)) &&
-	    x86_pmu.set_topdown_event_period)
-		return x86_pmu.set_topdown_event_period(event);
-
 	/*
 	 * If we are way outside a reasonable range then just skip forward:
 	 */
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2301,7 +2301,7 @@ static void intel_pmu_nhm_workaround(voi
 	for (i = 0; i < 4; i++) {
 		event = cpuc->events[i];
 		if (event)
-			x86_perf_event_update(event);
+			static_call(x86_pmu_update)(event);
 	}
 
 	for (i = 0; i < 4; i++) {
@@ -2316,7 +2316,7 @@ static void intel_pmu_nhm_workaround(voi
 		event = cpuc->events[i];
 
 		if (event) {
-			x86_perf_event_set_period(event);
+			static_call(x86_pmu_set_period)(event);
 			__x86_pmu_enable_event(&event->hw,
 					ARCH_PERFMON_EVENTSEL_ENABLE);
 		} else
@@ -2793,7 +2793,7 @@ static void intel_pmu_add_event(struct p
  */
 int intel_pmu_save_and_restart(struct perf_event *event)
 {
-	x86_perf_event_update(event);
+	static_call(x86_pmu_update)(event);
 	/*
 	 * For a checkpointed counter always reset back to 0.  This
 	 * avoids a situation where the counter overflows, aborts the
@@ -2805,9 +2805,27 @@ int intel_pmu_save_and_restart(struct pe
 		wrmsrl(event->hw.event_base, 0);
 		local64_set(&event->hw.prev_count, 0);
 	}
+	return static_call(x86_pmu_set_period)(event);
+}
+
+static int intel_pmu_set_period(struct perf_event *event)
+{
+	if (unlikely(is_topdown_count(event)) &&
+	    x86_pmu.set_topdown_event_period)
+		return x86_pmu.set_topdown_event_period(event);
+
 	return x86_perf_event_set_period(event);
 }
 
+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);
+
+	return x86_perf_event_update(event);
+}
+
 static void intel_pmu_reset(void)
 {
 	struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds);
@@ -4635,6 +4653,10 @@ static __initconst const struct x86_pmu
 	.enable_all		= core_pmu_enable_all,
 	.enable			= core_pmu_enable_event,
 	.disable		= x86_pmu_disable_event,
+
+	.set_period		= intel_pmu_set_period,
+	.update			= intel_pmu_update,
+
 	.hw_config		= core_pmu_hw_config,
 	.schedule_events	= x86_schedule_events,
 	.eventsel		= MSR_ARCH_PERFMON_EVENTSEL0,