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Date:   Tue, 22 Jan 2019 20:24:51 +0000
From:   "Lendacky, Thomas" <Thomas.Lendacky@....com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     "x86@...nel.org" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G

On 1/22/19 10:53 AM, Paul Menzel wrote:
> [Adding Tom to CC]
> 
> Dear Thomas, dear Tom,
> 
> 
> On 01/14/19 11:09, Paul Menzel wrote:
> 
>> On 01/11/19 21:43, Thomas Gleixner wrote:
>>
>>> On Mon, 7 Jan 2019, Paul Menzel wrote:
>>>> On 01/07/19 16:24, Thomas Gleixner wrote:
>>>>>> Linux 4.19.13 from Debian Sid/unstable logs the message below on the board MSI
>>>>>> MS-7A37/B350M MORTAR with the processor AMD Ryzen 3 2200G.
>>>>>>
>>>>>> As a result, the early time stamps do not seem to be working.
>>>>>
>>>>>>> [    0.000000] DMI: Micro-Star International Co., Ltd. MS-7A37/B350M MORTAR (MS-7A37), BIOS 1.I0 11/06/2018
>>>>>>> [    0.000000] tsc: Fast TSC calibration failed
>>>>>
>>>>> And the further boot log says:
>>>>>
>>>>> [    0.036000] tsc: Unable to calibrate against PIT
>>>>> [    0.036000] tsc: using HPET reference calibration
>>>>> [    0.036000] tsc: Detected 3500.117 MHz processor
>>>>>
>>>>> So the quick calibration in early boot fails because the PIT seems not to
>>>>> do what the kernel expects. Nothing we can cure :(
>>>>
>>>> I see. Can AMD confirm that this is the expected behavior? If yes, should
>>>> the fast TSC calibration be skipped on these devices?

Hi Paul,

It's not expected behavior. All of the systems that I have access to do
not exhibit this issue. Having said that, I have a limited number of
systems available to me.

I don't have much experience in this area, but if it is something that
consistently occurs, you might try to see if you can better identify why
it fails. The message is issued in pit_hpet_ptimer_calibrate_cpu() in file
arch/x86/kernel/tsc.c.

Thanks,
Tom

>>>
>>> It should work and we really don't want to add cpu family/model based
>>> decisions whether we invoke something or not. Those tables are stale before
>>> they hit mainline.
>>
>> Understood. If it’s supposed to work, any hints on how to debug this?
>>
>> Does some Linux kernel developers have an AMD Ryzen system, and can reproduce
>> the issue?
>>
>> It seems to fail with an AMD Ryzen 2400G too [1].
> 
> We now have an HP EliteDesk 705 G4 MT with that processsor, showing the same
> problem.
> 
> ```
> [    0.000000] Linux version 4.20.0.mx64.238 (root@...attivo.molgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 24 14:50:00 CET 2018
> […]
> [    0.000000] NX (Execute Disable) protection: active
> [    0.000000] SMBIOS 3.1 present.
> [    0.000000] DMI: HP HP EliteDesk 705 G4 MT/83E7, BIOS Q06 Ver. 02.04.01 09/14/2018
> [    0.000000] tsc: Fast TSC calibration failed
> [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
> […]
> [    0.017860] smpboot: CPU0: AMD Ryzen 5 PRO 2400G with Radeon Vega Graphics (family: 0x17, model: 0x11, stepping: 0x0)
> […]
> ```
> 
>> It also fails on an AMD Ryzen 7 1700 [2].
>>
>> ```
>> [ 0.000000] Linux version 4.15.0-kali3-amd64 (devel@...i.org) (gcc version 7.3.0 (Debian 7.3.0-16)) #1 SMP Debian 4.15.17-1kali1 (2018-04-25)
>> […]
>> [ 0.008000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
>> [ 0.028000] tsc: Fast TSC calibration failed
>> [ 0.032000] tsc: PIT calibration matches HPET. 1 loops
>> [ 0.032000] tsc: Detected 2994.246 MHz processor
>> […]
>> [ 0.044000] smpboot: CPU0: AMD Ryzen 7 1700 Eight-Core Processor (family: 0x17, model: 0x1, stepping: 0x1)
>> ```
>>
>> It *works* here on one system with AMD Ryzen 5 PRO 1500 and Linux 4.14.87.
>>
>> ```
>> [    0.000000] Linux version 4.14.87.mx64.236 (root@...earollingstone.molgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 10 09:48:57 CET 2018
>> […]
>> [    0.000000] tsc: Fast TSC calibration using PIT
>> […]
>> [    0.035000] smpboot: CPU0: AMD Ryzen 5 PRO 1500 Quad-Core Processor (family: 0x17, model: 0x1, stepping: 0x1)
>> ```
> 
> How to continue from here? Is documentation for that available from AMD?
> I didn’t find a BKDG (Bios Kernel Developer Guide) at [3].
> 
> 
> Kind regards,
> 
> Paul
> 
> 
>> [1]: https://bbs.archlinux.org/viewtopic.php?pid=1781282#p1781282
>> [2]: https://forums.kali.org/showthread.php?40444-error-loading-amdgpu-drivers-AMD-RX580-driver[3]: https://developer.amd.com/resources/developer-guides-manuals/
> 

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