linux-kernel - Re: [PATCH 10/15] hwmon, fam15h_power: add compute unit accumulated power

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Message-ID: <20150828080335.GA13309@gmail.com>
Date:	Fri, 28 Aug 2015 10:03:35 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Huang Rui <ray.huang@....com>
Cc:	Borislav Petkov <bp@...e.de>, Jean Delvare <jdelvare@...e.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Andy Lutomirski <luto@...capital.net>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	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 10/15] hwmon, fam15h_power: add compute unit accumulated
 power


* Huang Rui <ray.huang@....com> wrote:

> This patch adds a member in fam15h_power_data which specifies the
> compute unit accumulated power.
> 
> Signed-off-by: Huang Rui <ray.huang@....com>
> ---
>  drivers/hwmon/fam15h_power.c | 31 +++++++++++++++++++++++++++----
>  1 file changed, 27 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
> index fdfa18e..f5ff48f 100644
> --- a/drivers/hwmon/fam15h_power.c
> +++ b/drivers/hwmon/fam15h_power.c
> @@ -43,7 +43,9 @@ MODULE_LICENSE("GPL");
>  #define REG_TDP_LIMIT3			0xe8
>  
>  #define FAM15H_MIN_POWER_GROUPS		2
> +#define MAX_CUS				8
>  
> +#define MSR_F15H_CU_PWR_ACCUMULATOR	0xc001007a
>  #define MSR_F15H_CU_MAX_PWR_ACCUMULATOR	0xc001007b
>  
>  struct fam15h_power_data {
> @@ -54,6 +56,8 @@ struct fam15h_power_data {
>  	unsigned int cpu_pwr_sample_ratio;
>  	/* maximum accumulated power of a compute unit */
>  	u64 max_cu_acc_power;
> +	/* accumulated power of the compute units */
> +	u64 cu_acc_power[MAX_CUS];
>  };
>  
>  static ssize_t show_power(struct device *dev,
> @@ -207,6 +211,7 @@ static int fam15h_power_resume(struct pci_dev *pdev)
>  static int fam15h_power_init_data(struct pci_dev *f4,
>  				  struct fam15h_power_data *data)
>  {
> +	int cu_num, cores_per_cu, cpu, cu;
>  	u32 val, eax, ebx, ecx, edx;
>  	u64 tmp;
>  
> @@ -249,6 +254,21 @@ static int fam15h_power_init_data(struct pci_dev *f4,
>  
>  	data->max_cu_acc_power = tmp;
>  
> +	cores_per_cu = amd_get_cores_per_cu();
> +	cu_num = boot_cpu_data.x86_max_cores / cores_per_cu;
> +
> +	WARN_ON_ONCE(cu_num > MAX_CUS);
> +
> +	for (cpu = 0; cpu < cu_num * cores_per_cu; cpu += cores_per_cu) {

so 'cu_num * cores_per_cu' is really a roundabout way to say 
boot_cpu_data.x86_max_cores?

> +		cu = cpu / cores_per_cu;
> +		if (rdmsrl_safe_on_cpu(cpu, MSR_F15H_CU_PWR_ACCUMULATOR,
> +				       &data->cu_acc_power[cu])) {
> +			pr_err("Failed to read compute unit power accumulator MSR on core%d\n",
> +			       cpu);

Please don't break printk lines mid-line - ignore checkpatch in this case.

Also, the message talks about 'core', while a CPU ID is printed.

Thanks,

	Ingo
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