linux-kernel - Re: [RFC PATCH 6/9] cxl/pci: Add trace logging for CXL PCIe port RAS errors

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Date: Tue, 2 Jul 2024 16:53:51 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Terry Bowman <Terry.Bowman@....com>
CC: <dan.j.williams@...el.com>, <ira.weiny@...el.com>, <dave@...olabs.net>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>, <ming4.li@...el.com>,
	<vishal.l.verma@...el.com>, <jim.harris@...sung.com>,
	<ilpo.jarvinen@...ux.intel.com>, <ardb@...nel.org>,
	<sathyanarayanan.kuppuswamy@...ux.intel.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <Yazen.Ghannam@....com>,
	<Robert.Richter@....com>
Subject: Re: [RFC PATCH 6/9] cxl/pci: Add trace logging for CXL PCIe port
 RAS errors

On Mon, 24 Jun 2024 10:53:51 -0500
Terry Bowman <Terry.Bowman@....com> wrote:

> Hi Jonathan,
> 
> I added responses inline below.
> 
> On 6/20/24 07:53, Jonathan Cameron wrote:
> > On Mon, 17 Jun 2024 15:04:08 -0500
> > Terry Bowman <terry.bowman@....com> wrote:
> >   
> >> The cxl_pci driver uses kernel trace functions to log RAS errors for
> >> endpoints and RCH downstream ports. The same is needed for CXL root ports,
> >> CXL downstream switch ports, and CXL upstream switch ports.
> >>
> >> Add RAS correctable and RAS uncorrectable trace logging functions for
> >> CXL PCIE ports.
> >>
> >> Signed-off-by: Terry Bowman <terry.bowman@....com>
> >> ---
> >>  drivers/cxl/core/trace.h | 34 ++++++++++++++++++++++++++++++++++
> >>  1 file changed, 34 insertions(+)
> >>
> >> diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
> >> index e5f13260fc52..5cfd9952d88a 100644
> >> --- a/drivers/cxl/core/trace.h
> >> +++ b/drivers/cxl/core/trace.h
> >> @@ -48,6 +48,23 @@
> >>  	{ CXL_RAS_UC_IDE_RX_ERR, "IDE Rx Error" }			  \
> >>  )
> >>  
> >> +TRACE_EVENT(cxl_port_aer_uncorrectable_error,
> >> +	TP_PROTO(struct device *dev, u32 status),  
> > 
> > By comparison with existing code, why no fe or header
> > log?  Don't exist for ports for some reason?
> > Serial number of the port might also be useful.
> >   
> 
> The AER FE and header are the same for ports and the logging 
> needs to be added here.
> 
> There is no serial number for the ports.
Why not? At least for switch USP there might be (actually
I believe there can be for pretty much anything but there
are rules on them matching in switch funcitons).

J

> 
> Regards,
> Terry