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

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Date: Wed, 3 Jan 2024 14:30:02 -0800
From: Ira Weiny <ira.weiny@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>, 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

Smita Koralahalli wrote:
> 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

Ah ok.

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

I missed that you were not removing the efi/cper print.  I kind of thought
that was part of the series.

> 
> 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.

That is a good reason to keep the efi/cper print AFAICS.

> 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.

I'm not sure about their importance but if they are important I would say
they should be added to the tracepoint.

Ira