linux-kernel - Re: [PATCH 1/3] x86/MCE/AMD: Split amd_mce_is_memory

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Message-ID: <cd4fc492-074f-290f-81ac-cb65715c51b0@amd.com>
Date:   Wed, 14 Jun 2023 11:06:41 -0400
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     Shuai Xue <xueshuai@...ux.alibaba.com>, linux-edac@...r.kernel.org
Cc:     yazen.ghannam@....com, linux-kernel@...r.kernel.org,
        tony.luck@...el.com, x86@...nel.org, muralidhara.mk@....com,
        joao.m.martins@...cle.com, william.roche@...cle.com,
        boris.ostrovsky@...cle.com, john.allen@....com,
        baolin.wang@...ux.alibaba.com
Subject: Re: [PATCH 1/3] x86/MCE/AMD: Split amd_mce_is_memory_error()

On 6/13/2023 10:06 PM, Shuai Xue wrote:
> 
> 
> On 2023/6/13 22:11, Yazen Ghannam wrote:
>> Define helper functions for legacy and SMCA systems in order to reuse
>> individual checks in later changes.
>>
>> Describe what each function is checking for, and correct the XEC bitmask
>> for SMCA.
>>
>> No functional change intended.
>>
>> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
>> ---
>>   arch/x86/kernel/cpu/mce/amd.c | 30 +++++++++++++++++++++++++-----
>>   1 file changed, 25 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
>> index 5e74610b39e7..1ccfb0c9257f 100644
>> --- a/arch/x86/kernel/cpu/mce/amd.c
>> +++ b/arch/x86/kernel/cpu/mce/amd.c
>> @@ -713,17 +713,37 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
>>   		deferred_error_interrupt_enable(c);
>>   }
>>   
>> -bool amd_mce_is_memory_error(struct mce *m)
>> +/*
>> + * DRAM ECC errors are reported in the Northbridge (bank 4) with
>> + * Extended Error Code 8.
>> + */
>> +static bool legacy_mce_is_memory_error(struct mce *m)
>> +{
>> +	return m->bank == 4 && XEC(m->status, 0x1f) == 8;
>> +}
>> +
>> +/*
>> + * DRAM ECC errors are reported in Unified Memory Controllers with
>> + * Extended Error Code 0.
>> + */
>> +static bool smca_mce_is_memory_error(struct mce *m)
>>   {
>>   	enum smca_bank_types bank_type;
>> -	/* ErrCodeExt[20:16] */
>> -	u8 xec = (m->status >> 16) & 0x1f;
>> +
>> +	if (XEC(m->status, 0x3f))
>> +		return false;
>>   
>>   	bank_type = smca_get_bank_type(m->extcpu, m->bank);
>> +
>> +	return bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2;
>> +}
>> +
>> +bool amd_mce_is_memory_error(struct mce *m)
>> +{
>>   	if (mce_flags.smca)
>> -		return (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2) && xec == 0x0;
>> +		return smca_mce_is_memory_error(m);
>>   
>> -	return m->bank == 4 && xec == 0x8;
>> +	return legacy_mce_is_memory_error(m);
>>   }
>>   
>>   static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
> 
> Hi, Yazen,
> 
> Which tree are you working on? This patch can not be applied to Linus master ?
> (commit b6dad5178ceaf23f369c3711062ce1f2afc33644)
> 

Hi Shuai,

I'm using tip/master as the base.
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/

Sorry, I forgot to mention this in the cover letter.

Thanks,
Yazen