linux-kernel - Re: [PATCH v2 06/14] PCI/AER: Change AER driver to read UCE fatal status for all CXL PCIe port devices

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Message-ID: <77b60d4e-2792-4e00-a91c-d2892c091050@intel.com>
Date: Thu, 31 Oct 2024 09:58:18 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Terry Bowman <terry.bowman@....com>, ming4.li@...el.com,
 linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org, dave@...olabs.net, jonathan.cameron@...wei.com,
 alison.schofield@...el.com, vishal.l.verma@...el.com,
 dan.j.williams@...el.com, bhelgaas@...gle.com, mahesh@...ux.ibm.com,
 ira.weiny@...el.com, oohall@...il.com, Benjamin.Cheatham@....com,
 rrichter@....com, nathan.fontenot@....com,
 Smita.KoralahalliChannabasappa@....com
Subject: Re: [PATCH v2 06/14] PCI/AER: Change AER driver to read UCE fatal
 status for all CXL PCIe port devices



On 10/25/24 2:02 PM, Terry Bowman wrote:
> The AER service driver's aer_get_device_error_info() function doesn't read
> uncorrectable (UCE) fatal error status from PCIe upstream port devices,
> including CXL upstream switch ports. As a result, fatal errors are not
> logged or handled as needed for CXL PCIe upstream switch port devices.
> 
> Update the aer_get_device_error_info() function to read the UCE fatal
> status for all CXL PCIe port devices.
> 
> The fatal error status will be used in future patches implementing
> CXL PCIe port uncorrectable error handling and logging.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> ---
>  drivers/pci/pcie/aer.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 1d3e5b929661..d772f123c6a2 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -1250,6 +1250,7 @@ int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
>  	} else if (type == PCI_EXP_TYPE_ROOT_PORT ||
>  		   type == PCI_EXP_TYPE_RC_EC ||
>  		   type == PCI_EXP_TYPE_DOWNSTREAM ||
> +		   type == PCI_EXP_TYPE_UPSTREAM ||

At minimal we probably should do something like
(pcie_is_cxl(dev) && type == PCI_EXP_TYPE_UPSTREAM)
instead so we don't regress the original PCI behavior?
    
>  		   info->severity == AER_NONFATAL) {
>  
>  		/* Link is still healthy for IO reads */