linux-kernel - [PATCH 5/9] KVM: arm64: pmu: Use arm

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Message-Id: <20240607-arm-pmu-3-9-icntr-v1-5-c7bd2dceff3b@kernel.org>
Date: Fri, 07 Jun 2024 14:31:30 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Russell King <linux@...linux.org.uk>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, Will Deacon <will@...nel.org>, 
 Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 James Morse <james.morse@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Zenghui Yu <yuzenghui@...wei.com>, 
 Catalin Marinas <catalin.marinas@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-perf-users@...r.kernel.org, kvmarm@...ts.linux.dev
Subject: [PATCH 5/9] KVM: arm64: pmu: Use arm_pmuv3.h register accessors

Commit df29ddf4f04b ("arm64: perf: Abstract system register accesses
away") split off PMU register accessor functions to a standalone header.
Let's use it for KVM PMU code and get rid one copy of the ugly switch
macro.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 arch/arm64/include/asm/arm_pmuv3.h | 13 ++++++++
 arch/arm64/kvm/pmu.c               | 67 +++++---------------------------------
 2 files changed, 22 insertions(+), 58 deletions(-)

diff --git a/arch/arm64/include/asm/arm_pmuv3.h b/arch/arm64/include/asm/arm_pmuv3.h
index e96ce7900fc7..1ed91334fede 100644
--- a/arch/arm64/include/asm/arm_pmuv3.h
+++ b/arch/arm64/include/asm/arm_pmuv3.h
@@ -33,6 +33,14 @@ static inline void write_pmevtypern(int n, unsigned long val)
 	PMEVN_SWITCH(n, WRITE_PMEVTYPERN);
 }
 
+#define RETURN_READ_PMEVTYPERN(n) \
+	return read_sysreg(pmevtyper##n##_el0)
+static inline unsigned long read_pmevtypern(int n)
+{
+	PMEVN_SWITCH(n, RETURN_READ_PMEVTYPERN);
+	return 0;
+}
+
 static inline unsigned long read_pmmir(void)
 {
 	return read_cpuid(PMMIR_EL1);
@@ -96,6 +104,11 @@ static inline void write_pmccfiltr(u64 val)
 	write_sysreg(val, pmccfiltr_el0);
 }
 
+static inline u64 read_pmccfiltr(void)
+{
+	return read_sysreg(pmccfiltr_el0);
+}
+
 static inline void write_pmovsclr(u64 val)
 {
 	write_sysreg(val, pmovsclr_el0);
diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c
index e633b4434c6a..01c9a9efdd1c 100644
--- a/arch/arm64/kvm/pmu.c
+++ b/arch/arm64/kvm/pmu.c
@@ -6,6 +6,8 @@
 #include <linux/kvm_host.h>
 #include <linux/perf_event.h>
 
+#include <asm/arm_pmuv3.h>
+
 static DEFINE_PER_CPU(struct kvm_pmu_events, kvm_pmu_events);
 
 /*
@@ -62,63 +64,16 @@ void kvm_clr_pmu_events(u64 clr)
 	pmu->events_guest &= ~clr;
 }
 
-#define PMEVTYPER_READ_CASE(idx)				\
-	case idx:						\
-		return read_sysreg(pmevtyper##idx##_el0)
-
-#define PMEVTYPER_WRITE_CASE(idx)				\
-	case idx:						\
-		write_sysreg(val, pmevtyper##idx##_el0);	\
-		break
-
-#define PMEVTYPER_CASES(readwrite)				\
-	PMEVTYPER_##readwrite##_CASE(0);			\
-	PMEVTYPER_##readwrite##_CASE(1);			\
-	PMEVTYPER_##readwrite##_CASE(2);			\
-	PMEVTYPER_##readwrite##_CASE(3);			\
-	PMEVTYPER_##readwrite##_CASE(4);			\
-	PMEVTYPER_##readwrite##_CASE(5);			\
-	PMEVTYPER_##readwrite##_CASE(6);			\
-	PMEVTYPER_##readwrite##_CASE(7);			\
-	PMEVTYPER_##readwrite##_CASE(8);			\
-	PMEVTYPER_##readwrite##_CASE(9);			\
-	PMEVTYPER_##readwrite##_CASE(10);			\
-	PMEVTYPER_##readwrite##_CASE(11);			\
-	PMEVTYPER_##readwrite##_CASE(12);			\
-	PMEVTYPER_##readwrite##_CASE(13);			\
-	PMEVTYPER_##readwrite##_CASE(14);			\
-	PMEVTYPER_##readwrite##_CASE(15);			\
-	PMEVTYPER_##readwrite##_CASE(16);			\
-	PMEVTYPER_##readwrite##_CASE(17);			\
-	PMEVTYPER_##readwrite##_CASE(18);			\
-	PMEVTYPER_##readwrite##_CASE(19);			\
-	PMEVTYPER_##readwrite##_CASE(20);			\
-	PMEVTYPER_##readwrite##_CASE(21);			\
-	PMEVTYPER_##readwrite##_CASE(22);			\
-	PMEVTYPER_##readwrite##_CASE(23);			\
-	PMEVTYPER_##readwrite##_CASE(24);			\
-	PMEVTYPER_##readwrite##_CASE(25);			\
-	PMEVTYPER_##readwrite##_CASE(26);			\
-	PMEVTYPER_##readwrite##_CASE(27);			\
-	PMEVTYPER_##readwrite##_CASE(28);			\
-	PMEVTYPER_##readwrite##_CASE(29);			\
-	PMEVTYPER_##readwrite##_CASE(30)
-
 /*
  * Read a value direct from PMEVTYPER<idx> where idx is 0-30
  * or PMCCFILTR_EL0 where idx is ARMV8_PMU_CYCLE_IDX (31).
  */
 static u64 kvm_vcpu_pmu_read_evtype_direct(int idx)
 {
-	switch (idx) {
-	PMEVTYPER_CASES(READ);
-	case ARMV8_PMU_CYCLE_IDX:
-		return read_sysreg(pmccfiltr_el0);
-	default:
-		WARN_ON(1);
-	}
+	if (idx == ARMV8_PMU_CYCLE_IDX)
+		return read_pmccfiltr();
 
-	return 0;
+	return read_pmevtypern(idx);
 }
 
 /*
@@ -127,14 +82,10 @@ static u64 kvm_vcpu_pmu_read_evtype_direct(int idx)
  */
 static void kvm_vcpu_pmu_write_evtype_direct(int idx, u32 val)
 {
-	switch (idx) {
-	PMEVTYPER_CASES(WRITE);
-	case ARMV8_PMU_CYCLE_IDX:
-		write_sysreg(val, pmccfiltr_el0);
-		break;
-	default:
-		WARN_ON(1);
-	}
+	if (idx == ARMV8_PMU_CYCLE_IDX)
+		write_pmccfiltr(val);
+	else
+		write_pmevtypern(idx, val);
 }
 
 /*

-- 
2.43.0