[PATCH v2 0/2] PCI: Add boot options to disable DPC and AER recovery

[Yury Murashka <yurypm@arista.com>]

On large modular systems with a complex PCIe tree, the default kernel
AER recovery and DPC behavior could cause unexpected side effects.
Sometimes it would be nice to have the option to keep the system in an
unmodified state and be able to handle PCIe errors from userspace.

This series adds two new PCI kernel boot options:

  pci=noaer_recovery  - Disable AER error recovery while still logging
                        AER errors
  pci=nodpc           - Disable PCI Downstream Port Containment entirely

---
v1 -> v2:
  - Patch 1: Move disable check from pcie_do_recovery() in err.c to
    pci_aer_handle_error()/aer_recover_work_func() in aer.c for
    proper AER-specific scoping. AER error status bits are now
    preserved (not cleared) so userspace can inspect the error state
  - Patch 2: Also skip DPC port service driver registration in
    pcie_dpc_init() when disabled
  - Rebase onto v7.2-rc2

v1: https://lore.kernel.org/linux-pci/20260602105558.1799563-1-yurypm@arista.com/

Yury Murashka (2):
  PCI: Add pci=noaer_recovery kernel boot option
  PCI: Add pci=nodpc kernel boot option

 .../admin-guide/kernel-parameters.txt         |  9 ++++++
 drivers/pci/pci.c                             |  4 +++
 drivers/pci/pci.h                             |  4 +++
 drivers/pci/pcie/aer.c                        | 30 ++++++++++++-------
 drivers/pci/pcie/dpc.c                        | 19 ++++++++++--
 5 files changed, 53 insertions(+), 13 deletions(-)


base-commit: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53
-- 
2.51.0