Re: [PATCH v3 2/2] PCI: Add pci=nodpc kernel boot option

[sashiko-bot@kernel.org]

> Add pci=nodpc to let Linux opt out of Downstream Port Containment (DPC)
> and Error Disconnect Recover (EDR) support on systems where userspace
> manages PCIe errors.
> 
> Skip DPC initialization, state operations, hotplug recovery checks, and
> port service registration when disabled. Expose pci_dpc_available() so
> ACPI negotiation and PCIe port service discovery honor the same policy.
> Do not advertise EDR support or request DPC control through _OSC, and
> prevent native-port overrides from reintroducing DPC ownership.
> 
> Skip EDR notifier installation before the DPC-enabling _DSM call. Merely
> skipping the native DPC driver would allow EDR to enable hardware DPC
> while the handler lacks the capability information needed to recover.
> 
> The option disables Linux participation in DPC and EDR; it does not turn
> off firmware-owned DPC hardware. AER reporting and recovery remain
> independent and can be controlled with their own boot options.
> 
> Signed-off-by: Yury Murashka <yurypm@arista.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261022165842.1463451-1-yurypm@arista.com?part=2