[PATCH 0/4] pci: implement "pci=aer_panic"

[Hans Zhang]

On 2025/5/22 19:47, Manivannan Sadhasivam wrote:
> On Sat, May 17, 2025 at 12:55:14AM +0800, Hans Zhang wrote:
>> The following series introduces a new kernel command-line option aer_panic
>> to enhance error handling for PCIe Advanced Error Reporting (AER) in
>> mission-critical environments. This feature ensures deterministic recover
>> from fatal PCIe errors by triggering a controlled kernel panic when device
>> recovery fails, avoiding indefinite system hangs.
>>
>> Problem Statement
>> In systems where unresolved PCIe errors (e.g., bus hangs) occur,
>> traditional error recovery mechanisms may leave the system unresponsive
>> indefinitely. This is unacceptable for high-availability environment
>> requiring prompt recovery via reboot.
>>
>> Solution
>> The aer_panic option forces a kernel panic on unrecoverable AER errors.
>> This bypasses prolonged recovery attempts and ensures immediate reboot.
>>
> 
> You should not panic the kernel when a PCI error occurs (even if it is a fatal
> one). You should instead try to reset the root complex. For that you need this
> series that got merged recently:
> https://lore.kernel.org/all/20250508-pcie-reset-slot-v4-0-7050093e2b50@linaro.org
> 
> PS: You need to populate the slot_reset callback in your controller driver to
> reset the controller in the event of a fatal AER error or link down.

Dear Mani,

Thank you for your reply. I will take a look at the submission record 
you provided.

Best regards,
Hans