linux-kernel - Re: [PATCH v4 05/26] psci: Replace psci_function

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Message-ID: <20201203104331.GB96754@C02TD0UTHF1T.local>
Date:   Thu, 3 Dec 2020 10:43:31 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     kvmarm@...ts.cs.columbia.edu, Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 05/26] psci: Replace psci_function_id array with a
 struct

On Wed, Dec 02, 2020 at 06:41:01PM +0000, David Brazdil wrote:
> Small refactor that replaces array of v0.1 function IDs indexed by an
> enum of function-name constants with a struct of function IDs "indexed"
> by field names. This is done in preparation for exposing the IDs to
> other parts of the kernel. Exposing a struct avoids the need for
> bounds checking.
> 
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>

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

Mark.

> ---
>  drivers/firmware/psci/psci.c | 29 ++++++++++++++---------------
>  1 file changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
> index 13b9ed71b446..593fdd0e09a2 100644
> --- a/drivers/firmware/psci/psci.c
> +++ b/drivers/firmware/psci/psci.c
> @@ -58,15 +58,14 @@ typedef unsigned long (psci_fn)(unsigned long, unsigned long,
>  				unsigned long, unsigned long);
>  static psci_fn *invoke_psci_fn;
>  
> -enum psci_function {
> -	PSCI_FN_CPU_SUSPEND,
> -	PSCI_FN_CPU_ON,
> -	PSCI_FN_CPU_OFF,
> -	PSCI_FN_MIGRATE,
> -	PSCI_FN_MAX,
> +struct psci_0_1_function_ids {
> +	u32 cpu_suspend;
> +	u32 cpu_on;
> +	u32 cpu_off;
> +	u32 migrate;
>  };
>  
> -static u32 psci_function_id[PSCI_FN_MAX];
> +static struct psci_0_1_function_ids psci_0_1_function_ids;
>  
>  #define PSCI_0_2_POWER_STATE_MASK		\
>  				(PSCI_0_2_POWER_STATE_ID_MASK | \
> @@ -178,7 +177,7 @@ static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
>  
>  static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
>  {
> -	return __psci_cpu_suspend(psci_function_id[PSCI_FN_CPU_SUSPEND],
> +	return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
>  				  state, entry_point);
>  }
>  
> @@ -198,7 +197,7 @@ static int __psci_cpu_off(u32 fn, u32 state)
>  
>  static int psci_0_1_cpu_off(u32 state)
>  {
> -	return __psci_cpu_off(psci_function_id[PSCI_FN_CPU_OFF], state);
> +	return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
>  }
>  
>  static int psci_0_2_cpu_off(u32 state)
> @@ -216,7 +215,7 @@ static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
>  
>  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);
> +	return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
>  }
>  
>  static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
> @@ -234,7 +233,7 @@ static int __psci_migrate(u32 fn, unsigned long cpuid)
>  
>  static int psci_0_1_migrate(unsigned long cpuid)
>  {
> -	return __psci_migrate(psci_function_id[PSCI_FN_MIGRATE], cpuid);
> +	return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
>  }
>  
>  static int psci_0_2_migrate(unsigned long cpuid)
> @@ -548,22 +547,22 @@ static int __init psci_0_1_init(struct device_node *np)
>  	psci_ops.get_version = psci_0_1_get_version;
>  
>  	if (!of_property_read_u32(np, "cpu_suspend", &id)) {
> -		psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
> +		psci_0_1_function_ids.cpu_suspend = id;
>  		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_0_1_function_ids.cpu_off = id;
>  		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_0_1_function_ids.cpu_on = id;
>  		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_0_1_function_ids.migrate = id;
>  		psci_ops.migrate = psci_0_1_migrate;
>  	}
>  
> -- 
> 2.29.2.454.gaff20da3a2-goog
>