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Date:   Thu, 3 Dec 2020 10:42:46 +0000
From:   Mark Rutland <mark.rutland@arm.com>
To:     David Brazdil <dbrazdil@google.com>
Cc:     kvmarm@lists.cs.columbia.edu, Jonathan Corbet <corbet@lwn.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>,
        Christoph Lameter <cl@linux.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sudeep Holla <sudeep.holla@arm.com>, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        kernel-team@android.com
Subject: Re: [PATCH v4 04/26] psci: Split functions to v0.1 and v0.2+ variants
Message-ID: <20201203104246.GA96754@C02TD0UTHF1T.local>
References: <20201202184122.26046-1-dbrazdil@google.com>
 <20201202184122.26046-5-dbrazdil@google.com>
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On Wed, Dec 02, 2020 at 06:41:00PM +0000, David Brazdil wrote:
> Refactor implementation of v0.1+ functions (CPU_SUSPEND, CPU_OFF,
> CPU_ON, MIGRATE) to have two functions psci_0_1_foo / psci_0_2_foo that
> select the function ID and call a common helper __psci_foo.
> 
> This is a small cleanup so that the function ID array is only used for
> v0.1 configurations.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>

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

Mark.

> ---
>  drivers/firmware/psci/psci.c | 94 +++++++++++++++++++++++-------------
>  1 file changed, 60 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
> index ace5b9ac676c..13b9ed71b446 100644
> --- a/drivers/firmware/psci/psci.c
> +++ b/drivers/firmware/psci/psci.c
> @@ -168,46 +168,80 @@ int psci_set_osi_mode(bool enable)
>  	return psci_to_linux_errno(err);
>  }
>  
> -static int psci_cpu_suspend(u32 state, unsigned long entry_point)
> +static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
>  {
>  	int err;
> -	u32 fn;
>  
> -	fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
>  	err = invoke_psci_fn(fn, state, entry_point, 0);
>  	return psci_to_linux_errno(err);
>  }
>  
> -static int psci_cpu_off(u32 state)
> +static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
> +{
> +	return __psci_cpu_suspend(psci_function_id[PSCI_FN_CPU_SUSPEND],
> +				  state, entry_point);
> +}
> +
> +static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
> +{
> +	return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
> +				  state, entry_point);
> +}
> +
> +static int __psci_cpu_off(u32 fn, u32 state)
>  {
>  	int err;
> -	u32 fn;
>  
> -	fn = psci_function_id[PSCI_FN_CPU_OFF];
>  	err = invoke_psci_fn(fn, state, 0, 0);
>  	return psci_to_linux_errno(err);
>  }
>  
> -static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +static int psci_0_1_cpu_off(u32 state)
> +{
> +	return __psci_cpu_off(psci_function_id[PSCI_FN_CPU_OFF], state);
> +}
> +
> +static int psci_0_2_cpu_off(u32 state)
> +{
> +	return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
> +}
> +
> +static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
>  {
>  	int err;
> -	u32 fn;
>  
> -	fn = psci_function_id[PSCI_FN_CPU_ON];
>  	err = invoke_psci_fn(fn, cpuid, entry_point, 0);
>  	return psci_to_linux_errno(err);
>  }
>  
> -static int psci_migrate(unsigned long cpuid)
> +static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +{
> +	return __psci_cpu_on(psci_function_id[PSCI_FN_CPU_ON], cpuid, entry_point);
> +}
> +
> +static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +{
> +	return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
> +}
> +
> +static int __psci_migrate(u32 fn, unsigned long cpuid)
>  {
>  	int err;
> -	u32 fn;
>  
> -	fn = psci_function_id[PSCI_FN_MIGRATE];
>  	err = invoke_psci_fn(fn, cpuid, 0, 0);
>  	return psci_to_linux_errno(err);
>  }
>  
> +static int psci_0_1_migrate(unsigned long cpuid)
> +{
> +	return __psci_migrate(psci_function_id[PSCI_FN_MIGRATE], cpuid);
> +}
> +
> +static int psci_0_2_migrate(unsigned long cpuid)
> +{
> +	return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
> +}
> +
>  static int psci_affinity_info(unsigned long target_affinity,
>  		unsigned long lowest_affinity_level)
>  {
> @@ -352,7 +386,7 @@ static void __init psci_init_system_suspend(void)
>  
>  static void __init psci_init_cpu_suspend(void)
>  {
> -	int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
> +	int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
>  
>  	if (feature != PSCI_RET_NOT_SUPPORTED)
>  		psci_cpu_suspend_feature = feature;
> @@ -426,24 +460,16 @@ static void __init psci_init_smccc(void)
>  static void __init psci_0_2_set_functions(void)
>  {
>  	pr_info("Using standard PSCI v0.2 function IDs\n");
> -	psci_ops.get_version = psci_0_2_get_version;
> -
> -	psci_function_id[PSCI_FN_CPU_SUSPEND] =
> -					PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
> -	psci_ops.cpu_suspend = psci_cpu_suspend;
> -
> -	psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
> -	psci_ops.cpu_off = psci_cpu_off;
> -
> -	psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
> -	psci_ops.cpu_on = psci_cpu_on;
>  
> -	psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
> -	psci_ops.migrate = psci_migrate;
> -
> -	psci_ops.affinity_info = psci_affinity_info;
> -
> -	psci_ops.migrate_info_type = psci_migrate_info_type;
> +	psci_ops = (struct psci_operations){
> +		.get_version = psci_0_2_get_version,
> +		.cpu_suspend = psci_0_2_cpu_suspend,
> +		.cpu_off = psci_0_2_cpu_off,
> +		.cpu_on = psci_0_2_cpu_on,
> +		.migrate = psci_0_2_migrate,
> +		.affinity_info = psci_affinity_info,
> +		.migrate_info_type = psci_migrate_info_type,
> +	};
>  
>  	arm_pm_restart = psci_sys_reset;
>  
> @@ -523,22 +549,22 @@ static int __init psci_0_1_init(struct device_node *np)
>  
>  	if (!of_property_read_u32(np, "cpu_suspend", &id)) {
>  		psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
> -		psci_ops.cpu_suspend = psci_cpu_suspend;
> +		psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
>  	}
>  
>  	if (!of_property_read_u32(np, "cpu_off", &id)) {
>  		psci_function_id[PSCI_FN_CPU_OFF] = id;
> -		psci_ops.cpu_off = psci_cpu_off;
> +		psci_ops.cpu_off = psci_0_1_cpu_off;
>  	}
>  
>  	if (!of_property_read_u32(np, "cpu_on", &id)) {
>  		psci_function_id[PSCI_FN_CPU_ON] = id;
> -		psci_ops.cpu_on = psci_cpu_on;
> +		psci_ops.cpu_on = psci_0_1_cpu_on;
>  	}
>  
>  	if (!of_property_read_u32(np, "migrate", &id)) {
>  		psci_function_id[PSCI_FN_MIGRATE] = id;
> -		psci_ops.migrate = psci_migrate;
> +		psci_ops.migrate = psci_0_1_migrate;
>  	}
>  
>  	return 0;
> -- 
> 2.29.2.454.gaff20da3a2-goog
>