linux-kernel - Re: [PATCH v2 1/4] x86/mce: Add wrapper for struct mce to export vendor specific info

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Date: Wed, 26 Jun 2024 20:10:15 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Luck, Tony" <tony.luck@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc: Avadhut Naik <avadhut.naik@....com>, "x86@...nel.org" <x86@...nel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-trace-kernel@...r.kernel.org" <linux-trace-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rafael@...nel.org" <rafael@...nel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"mchehab@...nel.org" <mchehab@...nel.org>,
	"james.morse@....com" <james.morse@....com>,
	"airlied@...il.com" <airlied@...il.com>,
	"yazen.ghannam@....com" <yazen.ghannam@....com>,
	"john.allen@....com" <john.allen@....com>,
	"avadnaik@....com" <avadnaik@....com>
Subject: Re: [PATCH v2 1/4] x86/mce: Add wrapper for struct mce to export
 vendor specific info

On Wed, Jun 26, 2024 at 05:11:29PM +0000, Luck, Tony wrote:
> > Tony, any comments? You ok with this, would that fit any Intel-specific vendor
> > fields too or do you need some additional Intel-specific changes?
> 
> It looks easy enough to add any Intel specific bits to the union later.
> 
> Is there anyway that the trace event could be "smarter" about what vendor specific
> information to include based on boot_cpu_data.x86_vendor? As currently written
> Intel systems are going to see 3*u64 decoded into ascii, that are all zero. Not a
> huge deal, I think it will just look like "0x0,0x0,0x0"

Hmm, good question.

Yo, Steve, is there a way to do conditional things in a TP?

For example:

@@ -83,7 +87,8 @@ TRACE_EVENT(mce_record,
                __entry->walltime,
                __entry->socketid,
                __entry->apicid,
-               __entry->microcode)
+               __entry->microcode,

	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
		__print_array(__get_dynamic_array(v_data), __entry->len / 8, 8))

i.e., print that array only when on a AMD.

I'm sure this won't fly as it is macro magic - this is just to show the
intent...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette