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[PATCH 5/9] KVM: arm64: pmu: Use arm_pmuv3.h register accessors

Rob Herring (Arm) posted 9 patches 1 year, 8 months ago
There is a newer version of this series
[PATCH 5/9] KVM: arm64: pmu: Use arm_pmuv3.h register accessors
Posted by Rob Herring (Arm) 1 year, 8 months ago 
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@kernel.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
Re: [PATCH 5/9] KVM: arm64: pmu: Use arm_pmuv3.h register accessors
Posted by Mark Rutland 1 year, 8 months ago 
On Fri, Jun 07, 2024 at 02:31:30PM -0600, Rob Herring (Arm) wrote:
> 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@kernel.org>
> ---
>  arch/arm64/include/asm/arm_pmuv3.h | 13 ++++++++
>  arch/arm64/kvm/pmu.c               | 67 +++++---------------------------------
>  2 files changed, 22 insertions(+), 58 deletions(-)

Acked-by: Mark Rutland <mark.rutland@arm.com>

Mark.

> 
> 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
>

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