linux-kernel - Re: [PATCH v2 07/13] platform/x86: hfi: init per-cpu scores for each class

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Message-ID: <9c434cd5-24d6-4da9-89b5-b7ce42e6374a@linux.intel.com>
Date: Mon, 14 Oct 2024 13:15:43 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
cc: Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>, 
    x86@...nel.org, "Gautham R . Shenoy" <gautham.shenoy@....com>, 
    Perry Yuan <perry.yuan@....com>, LKML <linux-kernel@...r.kernel.org>, 
    linux-doc@...r.kernel.org, linux-pm@...r.kernel.org, 
    platform-driver-x86@...r.kernel.org, 
    Shyam Sundar S K <Shyam-sundar.S-k@....com>, 
    Perry Yuan <Perry.Yuan@....com>
Subject: Re: [PATCH v2 07/13] platform/x86: hfi: init per-cpu scores for each
 class

On Thu, 10 Oct 2024, Mario Limonciello wrote:

> From: Perry Yuan <Perry.Yuan@....com>
> 
> Initialize per cpu score `amd_hfi_ipcc_scores` which store energy score
> and performance score data for each class.
> 
> `Classic core` and `Dense core` are ranked according to those values as
> energy efficiency capability or performance capability.
> OS scheduler will pick cores from the ranking list on each class ID for
> the thread which provide the class id got from hardware feedback
> interface.
> 
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> Co-developed-by: Mario Limonciello <mario.limonciello@....com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v2:
>  * Rework
> ---
>  drivers/platform/x86/amd/hfi/hfi.c | 32 ++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
> index 10651399cf75..c0065ba0ed18 100644
> --- a/drivers/platform/x86/amd/hfi/hfi.c
> +++ b/drivers/platform/x86/amd/hfi/hfi.c
> @@ -119,6 +119,8 @@ struct amd_hfi_cpuinfo {
>  
>  static DEFINE_PER_CPU(struct amd_hfi_cpuinfo, amd_hfi_cpuinfo) = {.class_index = -1};
>  
> +static DEFINE_MUTEX(hfi_cpuinfo_lock);
> +
>  static int find_cpu_index_by_apicid(unsigned int target_apicid)
>  {
>  	int cpu_index;
> @@ -233,6 +235,31 @@ static void amd_hfi_remove(struct platform_device *pdev)
>  	mutex_destroy(&dev->lock);
>  }
>  
> +static int amd_set_hfi_ipcc_score(struct amd_hfi_cpuinfo *hfi_cpuinfo, int cpu)
> +{
> +	for (int i = 0; i < hfi_cpuinfo->nr_class; i++)
> +		WRITE_ONCE(hfi_cpuinfo->ipcc_scores[i],
> +			   hfi_cpuinfo->amd_hfi_classes[i].perf);
> +
> +	return 0;
> +}
> +
> +static int update_hfi_ipcc_scores(struct amd_hfi_data *amd_hfi_data)
> +{
> +	int cpu;
> +	int ret;
> +
> +	for_each_online_cpu(cpu) {
> +		struct amd_hfi_cpuinfo *hfi_cpuinfo = per_cpu_ptr(&amd_hfi_cpuinfo, cpu);
> +
> +		ret = amd_set_hfi_ipcc_score(hfi_cpuinfo, cpu);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int amd_hfi_metadata_parser(struct platform_device *pdev,
>  				   struct amd_hfi_data *amd_hfi_data)
>  {
> @@ -330,6 +357,11 @@ static int amd_hfi_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto out;
>  
> +	/* set up IPCC scores */
> +	ret = update_hfi_ipcc_scores(amd_hfi_data);
> +	if (ret)
> +		goto out;

return ret;

or

directly:

return update_hfi_ipcc_scores(amd_hfi_data);

> +
>  out:
>  	return ret;
>  }
> 

-- 
 i.