[PATCH v6 0/7] Address error and recovery for AER and DPC

[Oza Pawandeep]

This patch set brings in error handling support for DPC

The current implementation of AER and error message broadcasting to the
EP driver is tightly coupled and limited to AER service driver.
It is important to factor out broadcasting and other link handling
callbacks. So that not only when AER gets triggered, but also when DPC get
triggered (for e.g. ERR_FATAL), callbacks are handled appropriately.

DPC should enumerate the devices after recovering the link, which is
achieved by implementing error_resume callback.

Changes since v5:
    Sinan's and Keith's comments incorporated.
        > made separate patch for mutex
        > unified error repotting codes into driver/pci/pci.h
        > got rid of wait link active/inactive and
          made generic function in driver/pci/pci.c
Changes since v4:
    Bjorn's comments incorporated.
        > Renamed only do_recovery.
        > moved the things more locally to drivers/pci/pci.h
Changes since v3:
    Bjorn's comments incorporated.
        > Made separate patch renaming generic pci_err.c
        > Introduce pci_err.h to contain all the error types and recovery
        > removed all the dependencies on pci.h
Changes since v2:
    Based on feedback from Keith:
    "
    When DPC is triggered due to receipt of an uncorrectable error Message,
    the Requester ID from the Message is recorded in the DPC Error
    Source ID register and that Message is discarded and not forwarded Upstream.
    "
    Removed the patch where AER checks if DPC service is active
Changes since v1:
    Kbuild errors fixed:
        > pci_find_dpc_dev made static
        > ras_event.h updated
        > pci_find_aer_service call with CONFIG check
        > pci_find_dpc_service call with CONFIG check

Oza Pawandeep (7):
  PCI/AER: Rename error recovery to generic pci naming
  PCI/AER: factor out error reporting from AER
  PCI/ERR: add mutex to synchronize recovery
  PCI/DPC: Unify and plumb error handling into DPC
  PCI/AER: Unify aer error defines at single space
  PCI/DPC: Enumerate the devices after DPC trigger event
  PCI: Unify wait for link active into generic pci

 drivers/acpi/apei/ghes.c               |   1 +
 drivers/pci/hotplug/pciehp_hpc.c       |  21 +-
 drivers/pci/pci.c                      |  39 +++-
 drivers/pci/pci.h                      |  11 +
 drivers/pci/pcie/Makefile              |   2 +-
 drivers/pci/pcie/aer/aerdrv.h          |  30 ---
 drivers/pci/pcie/aer/aerdrv_core.c     | 293 +-------------------------
 drivers/pci/pcie/aer/aerdrv_errprint.c |   1 +
 drivers/pci/pcie/pcie-dpc.c            | 115 ++++++++++-
 drivers/pci/pcie/pcie-err.c            | 366 +++++++++++++++++++++++++++++++++
 drivers/pci/pcie/portdrv.h             |   2 +
 include/linux/aer.h                    |   4 -
 include/linux/pci.h                    |   1 +
 13 files changed, 534 insertions(+), 352 deletions(-)
 create mode 100644 drivers/pci/pcie/pcie-err.c

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