linux-kernel - Re: [PATCH 3/4] perf/arm_cspmu: Clean up ACPI dependency

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Message-ID: <90979d06-1f6b-90ee-4a68-0f5cc013c82a@arm.com>
Date:   Fri, 2 Jun 2023 17:02:36 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Robin Murphy <robin.murphy@....com>, will@...nel.org
Cc:     mark.rutland@....com, bwicaksono@...dia.com,
        ilkka@...amperecomputing.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] perf/arm_cspmu: Clean up ACPI dependency

On 01/06/2023 12:59, Robin Murphy wrote:
> Build-wise, the ACPI dependency consists of only a couple of things
> which could probably stand being factored out into ACPI helpers anyway.
> However for the immediate concern of working towards Devicetree support
> here, it's easy enough to make a few tweaks to contain the affected code
> locally, such that we can relax the Kconfig dependency.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>   drivers/perf/arm_cspmu/Kconfig     |  3 +--
>   drivers/perf/arm_cspmu/arm_cspmu.c | 17 +++++++++++++++--
>   2 files changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/perf/arm_cspmu/Kconfig b/drivers/perf/arm_cspmu/Kconfig
> index 0b316fe69a45..25d25ded0983 100644
> --- a/drivers/perf/arm_cspmu/Kconfig
> +++ b/drivers/perf/arm_cspmu/Kconfig
> @@ -4,8 +4,7 @@
>   
>   config ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU
>   	tristate "ARM Coresight Architecture PMU"
> -	depends on ARM64 && ACPI
> -	depends on ACPI_APMT || COMPILE_TEST
> +	depends on ARM64 || COMPILE_TEST
>   	help
>   	  Provides support for performance monitoring unit (PMU) devices
>   	  based on ARM CoreSight PMU architecture. Note that this PMU
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
> index 72dc7a9e1ca8..3b91115c376d 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -28,7 +28,6 @@
>   #include <linux/module.h>
>   #include <linux/perf_event.h>
>   #include <linux/platform_device.h>
> -#include <acpi/processor.h>
>   
>   #include "arm_cspmu.h"
>   #include "nvidia_cspmu.h"
> @@ -1075,6 +1074,9 @@ static int arm_cspmu_request_irq(struct arm_cspmu *cspmu)
>   	return 0;
>   }
>   
> +#if defined(CONFIG_ACPI) && defined(CONFIG_ARM64)
> +#include <acpi/processor.h>
> +
>   static inline int arm_cspmu_find_cpu_container(int cpu, u32 container_uid)
>   {
>   	u32 acpi_uid;
> @@ -1099,7 +1101,7 @@ static inline int arm_cspmu_find_cpu_container(int cpu, u32 container_uid)
>   	return -ENODEV;
>   }
>   
> -static int arm_cspmu_get_cpus(struct arm_cspmu *cspmu)
> +static int arm_cspmu_acpi_get_cpus(struct arm_cspmu *cspmu)
>   {
>   	struct device *dev;
>   	struct acpi_apmt_node *apmt_node;
> @@ -1135,6 +1137,17 @@ static int arm_cspmu_get_cpus(struct arm_cspmu *cspmu)
>   
>   	return 0;
>   }
> +#else
> +static int arm_cspmu_acpi_get_cpus(struct arm_cspmu *cspmu)
> +{
> +	return -ENODEV;
> +}
> +#endif
> +
> +static int arm_cspmu_get_cpus(struct arm_cspmu *cspmu)
> +{
> +	return arm_cspmu_acpi_get_cpus(cspmu);
> +}
>   
>   static int arm_cspmu_register_pmu(struct arm_cspmu *cspmu)
>   {


Reviewed-and-Tested-by: Suzuki K Poulose <suzuki.poulose@....com>