linux-kernel - Re: [PATCH v5 06/16] PCI/AER: Change AER driver to read UCE fatal status for all CXL PCIe Port devices

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Message-ID: <e5c215b5-ab8b-4466-9e1c-c0881aa94a46@amd.com>
Date: Tue, 14 Jan 2025 14:44:41 -0600
From: "Bowman, Terry" <terry.bowman@....com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org, nifan.cxl@...il.com, dave@...olabs.net,
 dave.jiang@...el.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, lukas@...ner.de,
 ming.li@...omail.com, PradeepVineshReddy.Kodamati@....com, alucerop@....com,
 Shuai Xue <xueshuai@...ux.alibaba.com>
Subject: Re: [PATCH v5 06/16] PCI/AER: Change AER driver to read UCE fatal
 status for all CXL PCIe Port devices




On 1/14/2025 5:32 AM, Jonathan Cameron wrote:
> On Tue, 7 Jan 2025 08:38:42 -0600
> Terry Bowman <terry.bowman@....com> 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 devices. Make the change such that non-CXL devices
>> are not affected.
>>
>> 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>
> This clashes with Shuai's series adding link healthy checks.
> Maybe we can reuse that logic to incorporate the condition we
> care about here?
>

I'll add changes to query Upstream Port link status. I'll borrow from Shuai's patch.

Regards,
Terry

>> ---
>>  drivers/pci/pcie/aer.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
>> index 62be599e3bee..79c828bdcb6d 100644
>> --- a/drivers/pci/pcie/aer.c
>> +++ b/drivers/pci/pcie/aer.c
>> @@ -1253,7 +1253,8 @@ 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 ||
>> -		   info->severity == AER_NONFATAL) {
>> +		   info->severity == AER_NONFATAL ||
>> +		   (pcie_is_cxl(dev) && type == PCI_EXP_TYPE_UPSTREAM)) {
>>  
>>  		/* Link is still healthy for IO reads */
>>  		pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS,