[v1] Introduce support for artificial Energy Model

[RESEND][PATCH 8/8] powercap: DTPM: Check for Energy Model type

Posted by Lukasz Luba 2 years, 7 months ago

The Energy Model power values might be artificial. In such case
it's safe to bail out during the registration, since the PowerCap
framework supports only micro-Watts.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 drivers/powercap/dtpm_cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
index bca2f912d349..f5eced0842b3 100644
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -211,7 +211,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
 		return 0;
 
 	pd = em_cpu_get(cpu);
-	if (!pd)
+	if (!pd || em_is_artificial(pd))
 		return -EINVAL;
 
 	dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL);
-- 
2.17.1

Re: [RESEND][PATCH 8/8] powercap: DTPM: Check for Energy Model type

Posted by Ionela Voinescu 2 years, 7 months ago

On Monday 21 Mar 2022 at 09:57:29 (+0000), Lukasz Luba wrote:
> The Energy Model power values might be artificial. In such case
> it's safe to bail out during the registration, since the PowerCap
> framework supports only micro-Watts.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
> ---
>  drivers/powercap/dtpm_cpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
> index bca2f912d349..f5eced0842b3 100644
> --- a/drivers/powercap/dtpm_cpu.c
> +++ b/drivers/powercap/dtpm_cpu.c
> @@ -211,7 +211,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
>  		return 0;
>  
>  	pd = em_cpu_get(cpu);
> -	if (!pd)
> +	if (!pd || em_is_artificial(pd))
>  		return -EINVAL;
>  
>  	dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL);

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>

> -- 
> 2.17.1
>