linux-kernel - Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

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Date:   Tue, 18 Apr 2023 22:10:13 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        David Woodhouse <dwmw2@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul McKenney <paulmck@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>,
        Jürgen Groß <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        "James E. J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Sabin Rapan <sabrapan@...zon.com>
Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

Dear Thomas,


Am 18.04.23 um 10:40 schrieb Thomas Gleixner:
> On Tue, Apr 18 2023 at 08:58, Thomas Gleixner wrote:
>> On Mon, Apr 17 2023 at 19:40, Paul Menzel wrote:
>>> Am 17.04.23 um 16:48 schrieb Thomas Gleixner:
>>>
>>>> On Mon, Apr 17 2023 at 13:19, Paul Menzel wrote:
>>>>> Am 15.04.23 um 01:44 schrieb Thomas Gleixner:
>>>>> [    0.258193] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD Graphics (family: 0x15, model: 0x13, stepping: 0x1)
>>>>> […]
>>>>> [    0.259329] smp: Bringing up secondary CPUs ...
>>>>> [    0.259527] x86: Booting SMP configuration:
>>>>> [    0.259528] .... node  #0, CPUs:      #1
>>>>> [    0.261007] After schedule_preempt_disabled
>>>>> [   10.260990] CPU1 failed to report alive state
>>>>
>>>> Weird. CPU1 fails to come up and report that it has reached the
>>>> synchronization point.
>>>>
>>>> Does it work when you add cpuhp.parallel=off on the kernel command line?
>>>
>>> Yes, the ten seconds delay is gone with `cpuhp.parallel=off`.
>>>
>>> There was a patch set in the past, that worked on that device. I think
>>> up to v4 it did *not* work at all and hung [1]. I need some days to
>>> collect the results again.
>>
>> Can you please apply the patch below on top of the pile remove the
>> command line option again?
> 
> Bah. That patch does not make any sense at all. Not enough coffee.
> 
> Can you please provide the output of cpuid?

Of course. Here the top, and the whole output is attached.

```
CPU 0:
    vendor_id = "AuthenticAMD"
    version information (1/eax):
       processor type  = primary processor (0)
       family          = 0xf (15)
       model           = 0x3 (3)
       stepping id     = 0x1 (1)
       extended family = 0x6 (6)
       extended model  = 0x1 (1)
       (family synth)  = 0x15 (21)
       (model synth)   = 0x13 (19)
       (simple synth)  = AMD (unknown type) (Richland RL-A1) 
[Piledriver], 32nm
[…]
```


Kind regards,

Paul
View attachment "cpuid.txt" of type "text/plain" (65008 bytes)