linux-kernel - Re: [RESEND PATCH v3 1/2] efi/cper: add cper_mem_err_status

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Date:   Tue, 25 Jan 2022 10:45:31 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     rric@...nel.org, mchehab@...nel.org, tony.luck@...el.com,
        james.morse@....com, ardb@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        zhangliguang@...ux.alibaba.com, zhuo.song@...ux.alibaba.com
Subject: Re: [RESEND PATCH v3 1/2] efi/cper: add cper_mem_err_status_str to
 decode error description

Hi, Borislav,

Thank you for your valuable comments.

在 2022/1/25 AM5:16, Borislav Petkov 写道:
> On Mon, Jan 24, 2022 at 10:47:58AM +0800, Shuai Xue wrote:
>> Introduce a new helper function cper_mem_err_status_str() which is used to
>> decode the description of error status, and the cper_print_mem() will call
>> it and report the details of error status.
>>
>> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
>> ---
>>  drivers/firmware/efi/cper.c | 46 ++++++++++++++++++++++++++++++++++++-
>>  include/linux/cper.h        |  1 +
>>  2 files changed, 46 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index 6ec8edec6329..addafccecd84 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -211,6 +211,49 @@ const char *cper_mem_err_type_str(unsigned int etype)
>>  }
>>  EXPORT_SYMBOL_GPL(cper_mem_err_type_str);
>>  
>> +const char *cper_mem_err_status_str(u64 status)
>> +{
>> +	switch ((status >> 8) & 0xff) {
>> +	case 1:
>> +		return "Error detected internal to the component";
> 
> You can make that table a lot more compact:
> 
>         switch ((status >> 8) & 0xff) {
>         case  1:        return "Error detected internal to the component";
>         case  4:        return "Storage error in DRAM memory";
>         case  5:        return "Storage error in TLB";
>         case  6:        return "Storage error in cache";
>         case  7:        return "Error in one or more functional units";
>         case  8:        return "component failed self test";
>         case  9:        return "Overflow or undervalue of internal queue";
>         case 16:        return "Error detected in the bus";
> 	...
> 
>> +	case 16:
>> +		return "Error detected in the bus";
> 
> And yes, that 16 needs to come before 17, ofc.

I will fix it in next version.

>> @@ -334,7 +377,8 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem,
>>  		return;
>>  	}
>>  	if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS)
>> -		printk("%s""error_status: 0x%016llx\n", pfx, mem->error_status);
>> +		printk("%s""error_status: 0x%016llx, %s\n", pfx, mem->error_status,
>> +				cper_mem_err_status_str(mem->error_status));
> 
> Arguments need to be aligned at opening brace, i.e.:
> 
>                 printk("%s""error_status: 0x%016llx, %s\n",
>                         pfx, mem->error_status, cper_mem_err_status_str(mem->error_status));
> 
> 
> Also, the naked error status number is not as user-friendly when we have
> the decoded string. So the format should be:
> 
>                 printk("%s error_status: %s (0x%016llx)\n",
>                         pfx, cper_mem_err_status_str(mem->error_status), mem->error_status);
> 

Good point. Will fix it.

Best Regard,
Shuai