[PATCH v12 0/6] 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 v11:
    Bjorn's comments addressed.
	> rename pcie-err.c to err.c
	> removed EXPORT_SYMBOL
	> made generic find_serivce function in port driver.
	> removed mutex patch as no need to have mutex in pcie_do_recovery
	> brough in DPC_FATAL in aer.h
	> so now all the error codes (AER and DPC) are unified in aer.h
Changes since v10:
    Christoph Hellwig's, David Laight's and Randy Dunlap's
    comments addressed.
        > renamed pci_do_recovery to pcie_do_recovery
        > removed inner braces in conditional statements.
        > restrctured the code in pci_wait_for_link
        > EXPORT_SYMBOL_GPL
Changes since v9:
    Sinan's comments addressed.
        > bool active = true; unnecessary variable removed.
Changes since v8:
    Fixed Kbuild errors.
Changes since v7:
    Rebased the code on pci master
        > https://kernel.googlesource.com/pub/scm/linux/kernel/git/helgaas/pci
Changes since v6:
    Sinan's and Stefan's comments implemented.
        > reordered patch 6 and 7
        > cleaned up
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 (6):
  PCI/AER: Rename error recovery to generic PCI naming
  PCI/AER: Factor out error reporting from AER
  PCI/PORTDRV: Implement generic find service
  PCI/DPC: Unify and plumb error handling into DPC
  PCI: Unify wait for link active into generic PCI
  PCI/DPC: Enumerate the devices after DPC trigger event

 drivers/pci/hotplug/pciehp_hpc.c   |  20 +--
 drivers/pci/pci.c                  |  29 +++
 drivers/pci/pci.h                  |   5 +
 drivers/pci/pcie/Makefile          |   2 +-
 drivers/pci/pcie/aer/aerdrv.h      |  30 ----
 drivers/pci/pcie/aer/aerdrv_core.c | 317 +-------------------------------
 drivers/pci/pcie/err.c             | 359 +++++++++++++++++++++++++++++++++++++
 drivers/pci/pcie/pcie-dpc.c        |  90 ++++++++--
 drivers/pci/pcie/portdrv.h         |   2 +
 drivers/pci/pcie/portdrv_core.c    |  43 +++++
 include/linux/aer.h                |   2 +
 11 files changed, 521 insertions(+), 378 deletions(-)
 create mode 100644 drivers/pci/pcie/err.c

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