Message-ID: <42dc683e2846ae8fc1e09715aaf7884660e1a386.camel@infradead.org>
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64
From:   David Woodhouse <dwmw2@infradead.org>
To:     Kim Phillips <kim.phillips@amd.com>,
        Oleksandr Natalenko <oleksandr@natalenko.name>
Cc:     tglx@linutronix.de, Usama Arif <usama.arif@bytedance.com>,
        arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org,
        pbonzini@redhat.com, paulmck@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
        thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de,
        fam.zheng@bytedance.com, punit.agrawal@bytedance.com,
        simon.evans@bytedance.com, liangma@liangbit.com,
        Piotr Gorski <lucjan.lucjanov@gmail.com>,
        "Limonciello, Mario" <Mario.Limonciello@amd.com>
Date:   Mon, 20 Feb 2023 23:30:17 +0000
In-Reply-To: <67dbc69f-b712-8971-f1c9-5d07f506a19c@amd.com>
References: <20230215145425.420125-1-usama.arif@bytedance.com>
         <2668799.mvXUDI8C0e@natalenko.name>
         <ed8d662351cfe5793f8cc7e7e8c514d05d16c501.camel@infradead.org>
         <2668869.mvXUDI8C0e@natalenko.name>
         <2a67f6cf18dd2c1879fad9fd8a28242918d3e5d2.camel@infradead.org>
         <982e1d6140705414e8fd60b990bd259a@natalenko.name>
         <715CBABF-4017-4784-8F30-5386F1524830@infradead.org>
         <67dbc69f-b712-8971-f1c9-5d07f506a19c@amd.com>
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On Mon, 2023-02-20 at 17:23 -0600, Kim Phillips wrote:
> On 2/20/23 3:39 PM, David Woodhouse wrote:
> > On 20 February 2023 21:23:38 GMT, Oleksandr Natalenko <oleksandr@natale=
nko.name> wrote:
> > > Hello.
> > >=20
> > > On 20.02.2023 21:31, David Woodhouse wrote:
> > > > On Mon, 2023-02-20 at 17:40 +0100, Oleksandr Natalenko wrote:
> > > > > On pond=C4=9Bl=C3=AD 20. =C3=BAnora 2023 17:20:13 CET David Woodh=
ouse wrote:
> > > > > > On Mon, 2023-02-20 at 17:08 +0100, Oleksandr Natalenko wrote:
> > > > > > >=20
> > > > > > > I've applied this to the v6.2 kernel, and suspend/resume brok=
e on
> > > > > > > my
> > > > > > > Ryzen 5950X desktop. The machine suspends just fine, but on
> > > > > > > resume
> > > > > > > the screen stays blank, and there's no visible disk I/O.
> > > > > > >=20
> > > > > > > Reverting the series brings suspend/resume back to working st=
ate.
> > > > > >=20
> > > > > > Hm, thanks. What if you add 'no_parallel_bringup' on the comman=
d
> > > > > > line?
> > > > >=20
> > > > > If the `no_parallel_bringup` param is added, the suspend/resume
> > > > > works.
> > > >=20
> > > > Thanks for the testing. Can I ask you to do one further test: apply=
 the
> > > > series only as far as patch 6/8 'x86/smpboot: Support parallel star=
tup
> > > > of secondary CPUs'.
> > > >=20
> > > > That will do the new startup asm sequence where each CPU finds its =
own
> > > > per-cpu data so it *could* work in parallel, but doesn't actually d=
o
> > > > the bringup in parallel yet.
> > >=20
> > > With patches 1 to 6 (including) applied and no extra cmdline
> > > params added the resume doesn't work.
> >=20
> > Hm. Kim, is there some weirdness with the way AMD CPUs get their
> > APIC ID in CPUID 0x1? Especially after resume?
>=20
> Not to my knowledge.=C2=A0 Mario?

Oleksandr, please could you show the output of 'cpuid' after a
successful resume?  I'm particularly looking for this part...


$ sudo cpuid | grep -A1 1/ebx
   miscellaneous (1/ebx):
      process local APIC physical ID =3D 0x0 (0)
--
   miscellaneous (1/ebx):
      process local APIC physical ID =3D 0x2 (2)
...


> > Perhaps we turn it off for any AMD CPU that doesn't have X2APIC and CPU=
ID 0xB?
>=20
> Perhaps.
>=20
> > > > Does your box have a proper serial port?
> > >=20
> > > No, sorry. I know it'd help with getting logs, and I do have a serial=
-to-USB cable that I use for another machine, but in this one the port is n=
ot routed to outside. I think I can put a header there as the motherboard d=
oes have pins, but I'd have to buy one first. In theory, I can do that, but=
 that won't happen within the next few weeks.
> > >=20
> > > P.S. Piotr Gorski (in Cc) also reported this: "My friend from CachyOS=
 can confirm bugs with smpboot patches. AMD FX 6300 only shows 1 core when =
using smp boot patchset". Probably, he can reply to this thread and provide=
 more details.
> > >=20
>=20
> I ran mem/disk versions of 'sudo rtcwake --mode mem -s 60'
> on my Rome server, and multiple suspend/resumes succeeded, and
> with all CPUs, but then the NETDEV WATCHDOG fired - not sure
> if it's related:

I suspect not.


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