From: Yazen Ghannam <yazen.ghannam@amd.com>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org,
tony.luck@intel.com, x86@kernel.org,
Smita.KoralahalliChannabasappa@amd.com
Subject: Re: [PATCH v2 1/8] x86/CPU/AMD: Save NodeId on AMD-based systems
Date: Thu, 17 Sep 2020 11:20:53 -0500 [thread overview]
Message-ID: <20200917162053.GA234735@yaz-nikka.amd.com> (raw)
In-Reply-To: <20200917103720.GG31960@zn.tnic>
On Thu, Sep 17, 2020 at 12:37:20PM +0200, Borislav Petkov wrote:
> On Wed, Sep 16, 2020 at 02:51:52PM -0500, Yazen Ghannam wrote:
> > What do you think?
>
> Yeah, forget logical_proc_id - the galactic senate of x86 maintainers
> said that we're keeping that for when BIOS vendors f*ck up with the
> phys_proc_id enumeration on AMD. Then we'll need that as a workaround.
>
> Look instead at:
>
> struct cpuinfo_x86 {
>
> ...
>
> u16 cpu_die_id;
> u16 logical_die_id;
>
> and
>
> 7745f03eb395 ("x86/topology: Add CPUID.1F multi-die/package support")
>
> "Some new systems have multiple software-visible die within each
> package."
>
> and you could map the AMD packages to those dies. And if you guys
> implement CPUID.1F to enumerate those packages the same way, then all
> should just work (famous last words).
>
> Because Intel dies is basically AMD packages consisting of a CCX, caches
> and DF.
>
> We would have to update the documentation in the end to denote that but
> let's see if this should work for you too first. Because the concepts
> sound very similar, if not identical...
>
Yep, we could ask the hardware folks to implement CPUID Leaf 0x1F, but
that'll be in some future products.
I actually tried using cpu_die_id, but I ran into an issue on newer
systems.
On older systems, there is no CPUID Leaf 0xB or 0x1F, and cpu_die_id
doesn't get explicitly set. So setting cpu_die_id equal to AMD NodeId
would work. But newer systems support CPUID Leaf 0xB, so cpu_die_id
will get explicitly set by detect_extended_topology(). The value set is
different from the AMD NodeId. And at that point I shied away from
doing any override or fixup.
Thanks,
Yazen
next prev parent reply other threads:[~2020-09-17 16:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 20:01 [PATCH v2 0/8] AMD MCA Address Translation Updates Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 1/8] x86/CPU/AMD: Save NodeId on AMD-based systems Yazen Ghannam
2020-09-09 18:06 ` Borislav Petkov
2020-09-09 20:17 ` Yazen Ghannam
2020-09-10 10:14 ` Borislav Petkov
2020-09-14 19:20 ` Yazen Ghannam
2020-09-15 8:35 ` Borislav Petkov
2020-09-16 19:51 ` Yazen Ghannam
2020-09-17 10:37 ` Borislav Petkov
2020-09-17 16:20 ` Yazen Ghannam [this message]
2020-09-17 16:40 ` Borislav Petkov
2020-09-17 19:44 ` Yazen Ghannam
2020-09-17 20:10 ` Borislav Petkov
2020-09-03 20:01 ` [PATCH v2 2/8] x86/CPU/AMD: Remove amd_get_nb_id() Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 3/8] EDAC/mce_amd: Use struct cpuinfo_x86.node_id for NodeId Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 4/8] x86/MCE/AMD: Use defines for register addresses in translation code Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 5/8] x86/MCE/AMD: Use macros to get bitfields " Yazen Ghannam
2020-09-21 13:58 ` Borislav Petkov
2020-09-03 20:01 ` [PATCH v2 6/8] x86/MCE/AMD: Drop tmp variable " Yazen Ghannam
2020-09-23 8:05 ` Borislav Petkov
2020-09-23 16:05 ` Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 7/8] x86/MCE/AMD: Group register reads " Yazen Ghannam
2020-09-03 20:01 ` [PATCH v2 8/8] x86/MCE/AMD Support new memory interleaving modes during address translation Yazen Ghannam
2020-09-23 8:20 ` Borislav Petkov
2020-09-23 16:25 ` Yazen Ghannam
2020-09-25 7:22 ` Borislav Petkov
2020-09-25 19:51 ` Yazen Ghannam
2020-09-28 9:47 ` Borislav Petkov
2020-09-28 15:53 ` Yazen Ghannam
2020-09-28 18:14 ` Borislav Petkov
2020-09-29 13:21 ` Yazen Ghannam
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