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Subject: Re: tsc: Fast TSC calibration failed with sever AMD Ryzen processor
 (2200G, 2400G, Ryzen 7 1700)
To:     Thomas Lendacky <Thomas.Lendacky@amd.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        "x86@kernel.org" <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>
 <5656446a-eaef-aa94-8766-49fec24257c6@molgen.mpg.de>
 <0bacd3f0-12fd-c1d9-8bed-320ac87d4505@molgen.mpg.de>
 <b95f5c96-2428-1f3b-0be4-ca7b439c7124@amd.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <cbfae260-6e31-f842-a164-379ec70d3b08@molgen.mpg.de>
Date:   Wed, 23 Jan 2019 13:56:40 +0100
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Dear Tom,


On 01/22/19 21:24, Lendacky, Thomas wrote:
> On 1/22/19 10:53 AM, Paul Menzel wrote:
>> [Adding Tom to CC]

>> 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/B=
350M 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?

> 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.

But as a data point, what Ryzen systems did you test with? Just to know, =
if
there are configurations where the same processor behaves inconsistently.=


Can you request one of the failing systems mentioned below to reproduce t=
he
problem?

> 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 wh=
y
> it fails. The message is issued in pit_hpet_ptimer_calibrate_cpu() in f=
ile
> arch/x86/kernel/tsc.c.

With the attached patch applied, I get:

    [    0.000000] tsc: quick_pit_calibrate: break in if !pit_expect_msb,=
 i =3D 42
    [    0.000000] tsc: Fast TSC calibration failed, i =3D 42
    [    0.000000] tsc: Using PIT calibration value

The functions `pit_verify_msb()` and `pit_expect_msb()` are:

```
static inline int pit_verify_msb(unsigned char val)
{
        /* Ignore LSB */
        inb(0x42);
        return inb(0x42) =3D=3D val;
}

static inline int pit_expect_msb(unsigned char val, u64 *tscp, unsigned l=
ong *deltap)
{
        int count;
        u64 tsc =3D 0, prev_tsc =3D 0;

        for (count =3D 0; count < 50000; count++) {
                if (!pit_verify_msb(val))
                        break;
                prev_tsc =3D tsc;
                tsc =3D get_cycles();
        }
        *deltap =3D get_cycles() - prev_tsc;
        *tscp =3D tsc;

        /*
         * We require _some_ success, but the quality control
         * will be based on the error terms on the TSC values.
         */
        return count > 5;
}
```

So count is smaller than or equal to 5, and `pit_verify_msb(val)` failed =
early,
right?

>>>> It should work and we really don't want to add cpu family/model base=
d
>>>> decisions whether we invoke something or not. Those tables are stale=
 before
>>>> they hit mainline.
>>>
>>> Understood. If it=E2=80=99s supposed to work, any hints on how to deb=
ug this?
>>>
>>> Does some Linux kernel developers have an AMD Ryzen system, and can r=
eproduce
>>> 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 th=
e same
>> problem.
>>
>> ```
>> [    0.000000] Linux version 4.20.0.mx64.238 (root@elcattivo.molgen.mp=
g.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 24 14:50:00 CET 2018
>> [=E2=80=A6]
>> [    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. 02.0=
4.01 09/14/2018
>> [    0.000000] tsc: Fast TSC calibration failed
>> [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable =3D=3D>=
 reserved
>> [=E2=80=A6]
>> [    0.017860] smpboot: CPU0: AMD Ryzen 5 PRO 2400G with Radeon Vega G=
raphics (family: 0x17, model: 0x11, stepping: 0x0)
>> [=E2=80=A6]
>> ```
>>
>>> It also fails on an AMD Ryzen 7 1700 [2].
>>>
>>> ```
>>> [ 0.000000] Linux version 4.15.0-kali3-amd64 (devel@kali.org) (gcc ve=
rsion 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 (fam=
ily: 0x17, model: 0x1, stepping: 0x1)
>>> ```
>>>
>>> It *works* here on one system with AMD Ryzen 5 PRO 1500 and Linux 4.1=
4.87.
>>>
>>> ```
>>> [    0.000000] Linux version 4.14.87.mx64.236 (root@likearollingstone=
=2Emolgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 10 09:48:57 CE=
T 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 Processo=
r (family: 0x17, model: 0x1, stepping: 0x1)
>>> ```
>>
>> How to continue from here? Is documentation for that available from AM=
D?
>> I didn=E2=80=99t find a BKDG (Bios Kernel Developer Guide) at [3].


Kind regards,

Paul


>>> [1]: https://bbs.archlinux.org/viewtopic.php?pid=3D1781282#p1781282
>>> [2]: https://forums.kali.org/showthread.php?40444-error-loading-amdgp=
u-drivers-AMD-RX580-driver[3]: https://developer.amd.com/resources/develo=
per-guides-manuals/

--------------452C442898FB1C784A346B5C
Content-Type: text/x-patch;
 name="0001-x86-kernel-tsc-Debug-early-TSC-calibration.patch"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
 filename="0001-x86-kernel-tsc-Debug-early-TSC-calibration.patch"

=46rom af43aa1191dd7abcfece56b712966bb19df94653 Mon Sep 17 00:00:00 2001
From: Paul Menzel <pmenzel@molgen.mpg.de>
Date: Wed, 23 Jan 2019 00:24:37 +0100
Subject: [PATCH] x86/kernel/tsc: Debug early TSC calibration

Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
---
 arch/x86/kernel/tsc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index e9f777bfed40..28d0b4b29668 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -549,8 +549,10 @@ static unsigned long quick_pit_calibrate(void)
=20
 	if (pit_expect_msb(0xff, &tsc, &d1)) {
 		for (i =3D 1; i <=3D MAX_QUICK_PIT_ITERATIONS; i++) {
-			if (!pit_expect_msb(0xff-i, &delta, &d2))
+			if (!pit_expect_msb(0xff-i, &delta, &d2)) {
+				pr_err("%s: break in if !pit_expect_msb, i =3D %d\n", __func__, i);
 				break;
+			}
=20
 			delta -=3D tsc;
=20
@@ -575,12 +577,14 @@ static unsigned long quick_pit_calibrate(void)
 			 * This also guarantees serialization of the
 			 * last cycle read ('d2') in pit_expect_msb.
 			 */
-			if (!pit_verify_msb(0xfe - i))
+			if (!pit_verify_msb(0xfe - i)) {
+				pr_err("%s: break in if !pit_verify_msb\n", __func__);
 				break;
+			}
 			goto success;
 		}
 	}
-	pr_info("Fast TSC calibration failed\n");
+	pr_info("Fast TSC calibration failed, i =3D %d\n", i);
 	return 0;
=20
 success:
--=20
2.20.1


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