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From: Thomas Gleixner <tglx@linutronix.de>
To: "Lendacky, Thomas" <Thomas.Lendacky@amd.com>
Cc: "Li, Aubrey" <aubrey.li@linux.intel.com>,
	Aubrey Li <aubrey.intel@gmail.com>,
	Daniel Drake <drake@endlessm.com>,
	"x86@kernel.org" <x86@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Endless Linux Upstreaming Team <linux@endlessm.com>
Subject: Re: setup_boot_APIC_clock() NULL dereference during early boot on reduced hardware platforms
Date: Thu, 8 Aug 2019 22:36:47 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1908082235590.2882@nanos.tec.linutronix.de> (raw)
In-Reply-To: <3d14b0cc-3cca-1874-3521-4ee2ec52141d@amd.com>

Tom,

On Thu, 1 Aug 2019, Lendacky, Thomas wrote:
> On 8/1/19 5:13 AM, Thomas Gleixner wrote:
> >   2.1.9 Timers
> > 
> >    Each core includes the following timers. These timers do not vary in
> >    frequency regardless of the current P-state or C-state.
> > 
> >    * Core::X86::Msr::TSC; the TSC increments at the rate specified by the
> >      P0 Pstate. See Core::X86::Msr::PStateDef.
> > 
> >    * The APIC timer (Core::X86::Apic::TimerInitialCount and
> >      Core::X86::Apic::TimerCurrentCount), which increments at the rate of
> >      2xCLKIN; the APIC timer may increment in units of between 1 and 8.
> > 
> > The Ryzens use a 100MHz input clock for the APIC normally, but I'm not sure
> > whether this is subject to overclocking. If so then it should be possible
> > to figure that out somehow. Tom?
> 
> Let me check with the hardware folks and I'll get back to you.

any update on this? The problem seems to come in from several sides now.

Thanks,

	tglx

  reply	other threads:[~2019-08-08 20:37 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-01  6:24 setup_boot_APIC_clock() NULL dereference during early boot on reduced hardware platforms Daniel Drake
2019-08-01  7:16 ` Aubrey Li
2019-08-01  7:35   ` Thomas Gleixner
2019-08-01  7:56     ` Aubrey Li
2019-08-01  8:13       ` Thomas Gleixner
2019-08-01  8:21         ` Li, Aubrey
2019-08-01 10:13           ` Thomas Gleixner
2019-08-01 15:44             ` Lendacky, Thomas
2019-08-08 20:36               ` Thomas Gleixner [this message]
2019-08-08 21:01                 ` Lendacky, Thomas
2019-08-08 21:08                   ` Thomas Gleixner
2019-08-08 21:36                     ` Lendacky, Thomas
2019-08-09 12:54                       ` [PATCH] x86/apic: Handle missing global clockevent gracefully Thomas Gleixner
2019-08-09 12:59                         ` Jiri Slaby
2019-08-09 13:58                         ` Lendacky, Thomas
2019-08-09 19:40                           ` Thomas Gleixner
2019-08-12  6:16                         ` Daniel Drake
2019-08-12  7:03                           ` Jiri Slaby
2019-08-15  5:02                           ` Daniel Drake
2019-08-12  7:46                         ` Li, Aubrey
2019-08-12 12:24                           ` Thomas Gleixner
2019-08-12 12:59                             ` Aubrey Li
2019-08-12 17:11                               ` Thomas Gleixner
2019-08-19 10:37                         ` [tip:x86/urgent] " tip-bot for Thomas Gleixner
2019-08-01  9:00   ` setup_boot_APIC_clock() NULL dereference during early boot on reduced hardware platforms Daniel Drake
2019-08-01 10:17     ` Thomas Gleixner
2019-08-01  7:27 ` Thomas Gleixner

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