linux-kernel - Re: [PATCH] x86, mce, severities: Add AMD severities function

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Date:	Fri, 20 Mar 2015 10:59:33 -0500
From:	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
To:	"Luck, Tony" <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"slaoub@...il.com" <slaoub@...il.com>,
	"luto@...capital.net" <luto@...capital.net>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH] x86, mce, severities: Add AMD severities function

On 3/19/2015 12:15 PM, Luck, Tony wrote:
>>> It would be best if what Tony suggested comes ontop of your patch with
>>> his Suggested-by: tag. This ordering should be also the easiest wrt
>>> functionality and bisectability.
>>>
>>>
>> Ok, I'll have it ready and send out a V2 by tomorrow if there are no
>> other comments/reviews.
> Fame & glory ... whatever. Just be sure to make the _intel() and _amd()
> severity functions "static" ... so you'll need something like this in mce-severity.c
>
> void mce_vendor_severity_init(void)
> {
> 	.... assign mce_severity here
> }
>
>

Ok, Here's how I have it currently:
void __init mcheck_vendor_init_severity(void)
{
         struct cpuinfo_x86 *c = &boot_cpu_data;

         switch (c->x86_vendor) {
         case X86_VENDOR_INTEL:
                 mce_severity = mce_severity_intel;
                 break;
         case X86_VENDOR_AMD:
                 mce_severity = mce_severity_amd;
                 break;
         default:
                 break;
         }
}
And I call this from mcheck_init().
I tested the above bits on AMD and the severities grading works fine.

Should we also come up with a '_default' function to assign to 
mce_severity function pointer?
Something like-
static int mce_severity_default(struct mce *m, int tolerant,
                                 char **msg, bool is_excp)
{
         pr_err("CPU#%d: No vendor specific severities grader assigned.
                 Implementing default grader\n", smp_processor_id());

         if (m->status & MCI_STATUS_PCC || m->status & MCI_STATUS_OVER)
                 return MCE_PANIC_SEVERITY;

         if (m->status & MCI_STATUS_UC)
                 return MCE_UC_SEVERITY;

         return MCE_KEEP_SEVERITY;
}

int (*mce_severity) (struct mce *m, int tolerant, char **msg, bool 
is_excp) =
                     mce_severity_default;

How much of grading should '_default' do if at all?

Thanks,
-Aravind.
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