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

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Message-ID: <2276df05-86f2-4f4f-a790-e26d09859352@amd.com>
Date: Thu, 17 Oct 2024 14:27:43 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: "Gautham R. Shenoy" <gautham.shenoy@....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 10/17/2024 01:00, Gautham R. Shenoy wrote:
> 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?

Thx, will fix.

> 
>> +		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.