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

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Date:	Fri, 28 Aug 2015 18:42:02 +0800
From:	Huang Rui <ray.huang@....com>
To:	Ingo Molnar <mingo@...nel.org>
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

On Fri, Aug 28, 2015 at 10:03:35AM +0200, Ingo Molnar wrote:
> 
> * Huang Rui <ray.huang@....com> wrote:
> 
> > @@ -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?
> 

Oh, yes. :)
I will update it at v2.

> > +		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.
> 

OK, I got it.

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

Yes, but actually this value is for the compute unit which the core
belongs to.
E.X. the MSR_F15H_CU_PWR_ACCUMULATOR value is the same between core 0
and core 1. Because they belong to the same compute unit.

Thanks,
Rui
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