[PATCH v6 14/16] PCI/AER: Introduce ratelimit for error logs

[Bjorn Helgaas]

On Mon, May 19, 2025 at 09:59:29PM -0700, Sathyanarayanan Kuppuswamy wrote:
> On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
> > From: Jon Pan-Doh <pandoh at google.com>
> > 
> > Spammy devices can flood kernel logs with AER errors and slow/stall
> > execution. Add per-device ratelimits for AER correctable and uncorrectable
> > errors that use the kernel defaults (10 per 5s).
> > 
> > There are two AER logging entry points:
> > 
> >    - aer_print_error() is used by DPC and native AER
> > 
> >    - pci_print_aer() is used by GHES and CXL
> > 
> > The native AER aer_print_error() case includes a loop that may log details
> > from multiple devices.  This is ratelimited by the union of ratelimits for
> > these devices, set by add_error_device(), which collects the devices.  If
> > no such device is found, the Error Source message is ratelimited by the
> > Root Port or RCEC that received the ERR_* message.
> > 
> > The DPC aer_print_error() case is currently not ratelimited.
> 
> Can we also not rate limit fatal errors in AER driver?

In other words, only rate limit AER_CORRECTABLE and AER_NONFATAL for
AER?  Seems plausible to me.