linux-kernel - Re: [PATCH v3 09/14] platform/x86: hfi: add power management callback

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Message-ID: <ZxCoG7vaLmvTMXFT@BLRRASHENOY1.amd.com>
Date: Thu, 17 Oct 2024 11:30:59 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	x86@...nel.org, Perry Yuan <perry.yuan@....com>,
	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>
Subject: Re: [PATCH v3 09/14] platform/x86: hfi: add power management callback

On Tue, Oct 15, 2024 at 04:36:40PM -0500, Mario Limonciello wrote:
> From: Perry Yuan <Perry.Yuan@....com>
> 
> Introduces power management callbacks for the `amd_hfi` driver.
> Specifically, the `suspend` and `resume` callbacks have been added
> to handle the necessary operations during system low power states
> and wake-up.
> 
> 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->v3:
>  * Whitespace (Ilpo)
> ---
>  drivers/platform/x86/amd/hfi/hfi.c | 33 ++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
> index d971ec1124af..79963c423d35 100644
> --- a/drivers/platform/x86/amd/hfi/hfi.c
> +++ b/drivers/platform/x86/amd/hfi/hfi.c
> @@ -392,6 +392,38 @@ static int amd_hfi_metadata_parser(struct platform_device *pdev,
>  	return ret;
>  }
>  
> +static int amd_hfi_pm_resume(struct device *dev)
> +{
> +	int ret, cpu;
> +
> +	for_each_present_cpu(cpu) {

Shouldn't this be for_each_online_cpu() in light of the hotplug
notifier callbacks implemented in Patch 8?

> +		ret = amd_hfi_set_state(cpu, true);
> +		if (ret < 0) {
> +			dev_err(dev, "failed to enable workload class config: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int amd_hfi_pm_suspend(struct device *dev)
> +{
> +	int ret, cpu;
> +
> +	for_each_present_cpu(cpu) {

Ditto..

> +		ret = amd_hfi_set_state(cpu, false);
> +		if (ret < 0) {
> +			dev_err(dev, "failed to disable workload class config: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(amd_hfi_pm_ops, amd_hfi_pm_suspend, amd_hfi_pm_resume);
> +
>  static const struct acpi_device_id amd_hfi_platform_match[] = {
>  	{ "AMDI0104", 0},
>  	{ }
> @@ -438,6 +470,7 @@ static struct platform_driver amd_hfi_driver = {
>  	.driver = {
>  		.name = AMD_HFI_DRIVER,
>  		.owner = THIS_MODULE,
> +		.pm = &amd_hfi_pm_ops,
>  		.acpi_match_table = ACPI_PTR(amd_hfi_platform_match),
>  	},
>  	.probe = amd_hfi_probe,
> -- 
> 2.43.0

--
Thanks and Regards
gautham.