linux-kernel - Re: [PATCH 07/15] hwmon, fam15h_power: add ratio of Tsample to the PTSC period

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Message-ID: <55DF24A6.5050106@roeck-us.net>
Date:	Thu, 27 Aug 2015 07:54:30 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Huang Rui <ray.huang@....com>, Borislav Petkov <bp@...e.de>,
	Jean Delvare <jdelvare@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker 
	<fweisbec@...il.com>
CC:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>
Subject: Re: [PATCH 07/15] hwmon, fam15h_power: add ratio of Tsample to the
 PTSC period

On 08/27/2015 01:07 AM, Huang Rui wrote:
> This patch adds a member (cpu_pwr_sample_ratio) of fam15h_power_data,
> that represents the ratio of compute unit power accumulator sample
> period to the PTSC counter period.
>
> Tsample: compute unit power accumulator sample period
> Tref: the performance timestamp counter period
> PTSC: performance timestamp counter
>
> Signed-off-by: Huang Rui <ray.huang@....com>

Applied to hwmon-next (after fixing spelling error 'detemine').

Thanks,
Guenter

> ---
>   drivers/hwmon/fam15h_power.c | 16 +++++++++++++++-
>   1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
> index 55b25ef..d6efcf6 100644
> --- a/drivers/hwmon/fam15h_power.c
> +++ b/drivers/hwmon/fam15h_power.c
> @@ -48,6 +48,7 @@ struct fam15h_power_data {
>   	unsigned int tdp_to_watts;
>   	unsigned int base_tdp;
>   	unsigned int processor_pwr_watts;
> +	unsigned int cpu_pwr_sample_ratio;
>   };
>
>   static ssize_t show_power(struct device *dev,
> @@ -201,7 +202,7 @@ static int fam15h_power_resume(struct pci_dev *pdev)
>   static void fam15h_power_init_data(struct pci_dev *f4,
>   					     struct fam15h_power_data *data)
>   {
> -	u32 val;
> +	u32 val, eax, ebx, ecx, edx;
>   	u64 tmp;
>
>   	pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
> @@ -222,6 +223,19 @@ static void fam15h_power_init_data(struct pci_dev *f4,
>
>   	/* convert to microWatt */
>   	data->processor_pwr_watts = (tmp * 15625) >> 10;
> +
> +	cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
> +
> +	/* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */
> +	if (!(edx & BIT(12)))
> +		return;
> +
> +	/*
> +	 * detemine the ratio of the compute unit power accumulator
> +	 * sample period to the PTSC counter period by executing CPUID
> +	 * Fn8000_0007:ECX
> +	 */
> +	data->cpu_pwr_sample_ratio = ecx;
>   }
>
>   static int fam15h_power_probe(struct pci_dev *pdev,
>

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