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Subject: Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     x86@kernel.org, LKML <linux-kernel@vger.kernel.org>
References: <fd05d500-f1b5-7115-4326-7c7fee9f5456@molgen.mpg.de>
 <alpine.DEB.2.21.1901071622160.2688@nanos.tec.linutronix.de>
 <9f444c64-c221-e729-7eb5-fc4f093c16d3@molgen.mpg.de>
 <alpine.DEB.2.21.1901112141480.1661@nanos.tec.linutronix.de>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <5656446a-eaef-aa94-8766-49fec24257c6@molgen.mpg.de>
Date:   Mon, 14 Jan 2019 11:09:35 +0100
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Dear Thomas,


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/B350=
M 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 no=
t to
>>> do what the kernel expects. Nothing we can cure :(
>>
>> I see. Can AMD confirm that this is the expected behavior? If yes, sho=
uld
>> the fast TSC calibration be skipped on these devices?
>=20
> 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 be=
fore
> they hit mainline.

Understood. If it=E2=80=99s supposed to work, any hints on how to debug t=
his?

Does some Linux kernel developers have an AMD Ryzen system, and can repro=
duce
the issue?

It seems to fail with an AMD Ryzen 2400G too [1].

It also fails on an AMD Ryzen 7 1700 [2].

```
[ 0.000000] Linux version 4.15.0-kali3-amd64 (devel@kali.org) (gcc versio=
n 7.3.0 (Debian 7.3.0-16)) #1 SMP Debian 4.15.17-1kali1 (2018-04-25)
[=E2=80=A6]
[ 0.008000] ..TIMER: vector=3D0x30 apic1=3D0 pin1=3D2 apic2=3D-1 pin2=3D-=
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
[=E2=80=A6]
[ 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=
=2E

```
[    0.000000] Linux version 4.14.87.mx64.236 (root@likearollingstone.mol=
gen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 10 09:48:57 CET 2018=

[=E2=80=A6]
[    0.000000] tsc: Fast TSC calibration using PIT
[=E2=80=A6]
[    0.035000] smpboot: CPU0: AMD Ryzen 5 PRO 1500 Quad-Core Processor (f=
amily: 0x17, model: 0x1, stepping: 0x1)
```


Kind regards,

Paul


[1]: https://bbs.archlinux.org/viewtopic.php?pid=3D1781282#p1781282
[2]: https://forums.kali.org/showthread.php?40444-error-loading-amdgpu-dr=
ivers-AMD-RX580-driver


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