linux-kernel - Re: [PATCH 2/4] efi/cper, cxl: Make definitions and structures global

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Date: Wed, 3 Jan 2024 12:16:43 -0800
From: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To: Ira Weiny <ira.weiny@...el.com>, linux-efi@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>,
 Dan Williams <dan.j.williams@...el.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH 2/4] efi/cper, cxl: Make definitions and structures global

On 1/2/2024 8:30 AM, Ira Weiny wrote:
> Smita Koralahalli wrote:
>> In preparation to add tracepoint support, move protocol error UUID
>> definition to a common location and make CXL RAS capability struct
>> global for use across different modules.
>>
>> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> 
> [snip]
> 
>> diff --git a/drivers/firmware/efi/cper_cxl.h b/drivers/firmware/efi/cper_cxl.h
>> index 86bfcf7909ec..6f8c00495708 100644
>> --- a/drivers/firmware/efi/cper_cxl.h
>> +++ b/drivers/firmware/efi/cper_cxl.h
>> @@ -7,14 +7,11 @@
>>    * Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
>>    */
>>   
>> +#include <linux/cxl-event.h>
>> +
>>   #ifndef LINUX_CPER_CXL_H
>>   #define LINUX_CPER_CXL_H
>>   
>> -/* CXL Protocol Error Section */
>> -#define CPER_SEC_CXL_PROT_ERR						\
>> -	GUID_INIT(0x80B9EFB4, 0x52B5, 0x4DE3, 0xA7, 0x77, 0x68, 0x78,	\
>> -		  0x4B, 0x77, 0x10, 0x48)
>> -
>>   #pragma pack(1)
>>   
>>   /* Compute Express Link Protocol Error Section, UEFI v2.10 sec N.2.13 */
>> diff --git a/include/linux/cper.h b/include/linux/cper.h
>> index c1a7dc325121..2cbf0a93785a 100644
>> --- a/include/linux/cper.h
>> +++ b/include/linux/cper.h
>> @@ -89,6 +89,10 @@ enum {
>>   #define CPER_NOTIFY_DMAR						\
>>   	GUID_INIT(0x667DD791, 0xC6B3, 0x4c27, 0x8A, 0x6B, 0x0F, 0x8E,	\
>>   		  0x72, 0x2D, 0xEB, 0x41)
>> +/* CXL Protocol Error Section */
>> +#define CPER_SEC_CXL_PROT_ERR						\
>> +	GUID_INIT(0x80B9EFB4, 0x52B5, 0x4DE3, 0xA7, 0x77, 0x68, 0x78,	\
>> +		  0x4B, 0x77, 0x10, 0x48)
> 
> Is this shared with code outside of GHES?  I did not need my GUID defines
> outside of ghes.c and further becuase the events are defined as UUID's I
> chose to keep the GUID definition as local as possible to ghes.c.
> 
> Can you do the same with this define?

Actually, it is shared with efi/cper.
https://elixir.bootlin.com/linux/v6.7-rc8/source/drivers/firmware/efi/cper.c#L602

But this would be something to look into. Should we continue to support 
logging from efi/cper or just confine it to ghes..

If we just log it from ghes similar to component events, we might loose 
error records from RCH Downstream Port and other agent_types which do 
not log device_ids. Also, I'm not sure how useful are other fields in 
protocol error CPER, the ones like Capability struct and DVSEC len etc 
as the tracepoints doesn't log all of them.

Thanks,
Smita

> 
> The rest looks good,
> Ira
> 
> [snip]
>