linux-kernel - Re: [PATCH v2 16/16] EDAC/mce_amd: Add support for FRU Text in MCA

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Message-ID: <0c903e3b-093e-461a-aa70-c2d58fc6d82d@amd.com>
Date: Mon, 8 Apr 2024 14:47:52 -0500
From: "Naik, Avadhut" <avadnaik@....com>
To: "Luck, Tony" <tony.luck@...el.com>, Yazen Ghannam <yazen.ghannam@....com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "x86@...nel.org" <x86@...nel.org>,
 "Avadhut.Naik@....com" <Avadhut.Naik@....com>,
 "John.Allen@....com" <John.Allen@....com>,
 "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH v2 16/16] EDAC/mce_amd: Add support for FRU Text in MCA



On 4/5/2024 11:06, Luck, Tony wrote:
>> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
>> index aa27729f7899..a4d09dda5fae 100644
>> --- a/arch/x86/kernel/cpu/mce/core.c
>> +++ b/arch/x86/kernel/cpu/mce/core.c
>> @@ -207,6 +207,8 @@ static void __print_mce(struct mce_hw_err *err)
>>                       pr_cont("SYND2 %llx ", err->vi.amd.synd2);
>>               if (m->ipid)
>>                       pr_cont("IPID %llx ", m->ipid);
>> +             if (err->vi.amd.config)
> 
> This is in common code. If other vendors start adding their own stuff to the
> "vi" union you might incorrectly print this.  Add a vendor check before looking
> at values inside "m->vi".
>

Do we really need an explicit vendor check in this particular instance?

Below is a snippet from __print_mce() after applying this series:

    if (mce_flags.smca) {
        if (m->synd)
            pr_cont("SYND %llx ", m->synd);
        if (err->vi.amd.synd1)
            pr_cont("SYND1 %llx ", err->vi.amd.synd1);
        if (err->vi.amd.synd2)
            pr_cont("SYND2 %llx ", err->vi.amd.synd2);
        if (m->ipid)
            pr_cont("IPID %llx ", m->ipid);
        if (err->vi.amd.config)
            pr_cont("CONFIG %llx ", err->vi.amd.config);
    }

    pr_cont("\n");

All of the above registers including the newly added config MSR will only
be logged if the smca flag is set in mce_flags.
Doesn't that already serve as a vendor check of sorts?
Something that I am missing here?

-- 
Thanks,
Avadhut Naik