linux-kernel - Re: [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86

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Date:	Fri, 28 Mar 2014 16:20:54 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Clemens Ladisch <clemens@...isch.de>, tglx@...utronix.de,
	mingo@...e.hu, hpa@...or.com, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y
 for X86_64

On Fri, Mar 28, 2014 at 09:11:17AM +0100, Ingo Molnar wrote:
> 
> * Clemens Ladisch <clemens@...isch.de> wrote:
> 
> > Feng Tang wrote:
> > > On Fri, Mar 28, 2014 at 08:17:16AM +0100, Ingo Molnar wrote:
> > >> * Feng Tang <feng.tang@...el.com> wrote:
> > >>  - or the kernel should have a quirk to reliably disable it. Why
> > >>    should we crash or misbehave if a driver is built into the
> > >>    kernel?
> > >
> > > I thought about this before, HPET doesn't have PCI ID like stuff,
> > 
> > HPET does have the PCI vendor ID in the first register.
> > 
> > > only thing I can think of to identify them may be the CPU family/ID.
> > 
> > The HPET is implemented by some actual chip, and that chip also has lots
> > of PCI devices.  (In the case of a SoC, the CPU ID would work, too).
> 
> Correct. See arch/x86/kernel/hpet.c, which has a large number of HPET 
> quirks keyed off chipset PCI IDs:
> 
>   DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
>                            ich_force_enable_hpet);
>   DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0,
>                            ich_force_enable_hpet);
>   DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
>                            ich_force_enable_hpet);
>   [...]

Got it, thanks Ingo and Clemens for the pointer. Will try to figure it out.

- Feng
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