[v4,0/8] Fix long standing AER Error Handling Issues

Message

Naveen Naidu Oct. 5, 2021, 5:18 p.m. UTC

This patch series aims at fixing some of the AER error handling issues
we have.

Currently we have the following issues:
 - Confusing message in aer_print_error()
 - aer_err_info not being initialized completely in DPC path before
   we print the AER logs
 - A bug [1] in clearing of AER registers in the native AER path

[1] https://lore.kernel.org/linux-pci/20151229155822.GA17321@localhost/

The primary aim of this patch series is to converge the APEI path and the
native AER error handling paths. In our current code, we find that we
have two different behaviours (especially when it comes to clearing of
the AER registers) for the same functionality.

This patch series, tries to bring the same semantics and hence more
commonanlity between the APEI part of code and the native OS
handling of AER errors.

PATCH 1:
  - Fixes the first issue

PATCH 2 - 4:
  - Fixes the second issue
  - "Patch 3/8" is dependent on "Patch 2/8" in the series

PATCH 5 - 7
  - Deals with converging the various paths and brings more
    commonality between them
  - "Patch 6/8" depends on "Patch 1/8"

PATCH 8:
  -  Adds extra information in AER error logs.

Thanks,
Naveen Naidu

Changelog
=========

v4:
  - Implement review comments
  - Make "Patch 1/8" commit message more meaningful
  - Fix the code comment error detected by kernel test robot 
    in "Patch 6/8"

v2 and v3:
  - Fix up mail formatting and include the appropriate receipients for
    the patch.

Naveen Naidu (8):
 [PATCH v4 1/8] PCI/AER: Remove ID from aer_agent_string[]
 [PATCH v4 2/8] PCI: Cleanup struct aer_err_info
 [PATCH v4 3/8] PCI/DPC: Initialize info->id in dpc_process_error()
 [PATCH v4 4/8] PCI/DPC: Use pci_aer_clear_status() in dpc_process_error()
 [PATCH v4 5/8] PCI/DPC: Converge EDR and DPC Path of clearing AER registers
 [PATCH v4 6/8] PCI/AER: Clear error device AER registers in aer_irq()
 [PATCH v4 7/8] PCI/ERR: Remove redundant clearing of AER register in pcie_do_recovery()
 [PATCH v4 8/8] PCI/AER: Include DEVCTL in aer_print_error()

 drivers/pci/pci.h      |  23 +++-
 drivers/pci/pcie/aer.c | 269 ++++++++++++++++++++++++++++-------------
 drivers/pci/pcie/dpc.c |   9 +-
 drivers/pci/pcie/err.c |   9 +-
 4 files changed, 209 insertions(+), 101 deletions(-)