linux-kernel - Re: [PATCH 7/8] cpufreq: Add support for x86 cpuinfo auto loading v3

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Date:	Wed, 21 Dec 2011 12:14:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	Thomas Renninger <trenn@...e.de>, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org, kay.sievers@....org,
	davej@...hat.com, kay.sievers@...y.org
Subject: Re: [PATCH 7/8] cpufreq: Add support for x86 cpuinfo auto loading
 v3

On 12/21/2011 12:12 PM, Andi Kleen wrote:
>>> +static const struct x86_cpu_id powernow_k8_ids[] = {
>>> +	{ X86_VENDOR_AMD, 0xf, },
>>> +	{ X86_VENDOR_AMD, 0x10, },
>>> +	{ X86_VENDOR_AMD, 0x11, },
>>> +	{ X86_VENDOR_AMD, 0x12, },
>>> +	{ X86_VENDOR_AMD, 0x13, },
>>> +	{ X86_VENDOR_AMD, 0x14, },
>> { X86_VENDOR_AMD, 0x15, },
>>
>> Should also have BullDozer family included.
> 
> I think it really needs a cpuid feature bit for the hwpstate.  This is
> not in one of the normal CPUID leaves, so the amd specific CPU init
> code would need to set it.
> 
> I added 0x15 for now, but it would be good if someone with the hardware
> fixed it like this.
> 
> Then could just add a match on "AMD-hw pstate" or so.
> 

Agreed.  This is literally screaming for a synthetic CPUID bit.

	-hpa

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