[PATCH v15 0/5] Add Error Disconnect Recover (EDR) support

[sathyanarayanan . kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>

This patchset adds support for following features:

1. Error Disconnect Recover (EDR) support.
2. _OSC based negotiation support for DPC.

You can find EDR spec in the following link.

https://members.pcisig.com/wg/PCI-SIG/document/12614

Changes since v14:
 * Rebased on top of v5.6-rc1

Changes since v13:
 * Moved all EDR related code to edr.c
 * Addressed Bjorns comments.

Changes since v12:
 * Addressed Bjorns comments.
 * Added check for CONFIG_PCIE_EDR before requesting DPC control from firmware.
 * Removed ff_check parameter from AER APIs.
 * Used macros for _OST return status values in DPC driver.

Changes since v11:
 * Allowed error recovery to proceed after successful reset_link().
 * Used correct ACPI handle for sending EDR status.
 * Rebased on top of v5.5-rc5

Changes since v10:
 * Added "edr_enabled" member to dpc priv structure, which is used to cache EDR
   enabling status based on status of pcie_ports_dpc_native and FF mode.
 * Changed type of _DSM argument from Integer to Package in acpi_enable_dpc_port()
   function to fix ACPI related boot warnings.
 * Rebased on top of v5.5-rc3

Changes since v9:
 * Removed caching of pcie_aer_get_firmware_first() in dpc driver.
 * Added proper spec reference in git log for patch 5 & 7.
 * Added new function parameter "ff_check" to pci_cleanup_aer_uncorrect_error_status(),
   pci_aer_clear_fatal_status() and pci_cleanup_aer_error_status_regs() functions.
 * Rebased on top of v5.4-rc5

Changes since v8:
 * Rebased on top of v5.4-rc1

Changes since v7:
 * Updated DSM version number to match the spec.

Changes since v6:
 * Modified the order of patches to enable EDR only after all necessary support is added in kernel.
 * Addressed Bjorn comments.

Changes since v5:
 * Addressed Keith's comments.
 * Added additional check for FF mode in pci_aer_init().
 * Updated commit history of "PCI/DPC: Add support for DPC recovery on NON_FATAL errors" patch.

Changes since v4:
 * Rebased on top of v5.3-rc1
 * Fixed lock/unlock issue in edr_handle_event().
 * Merged "Update error status after reset_link()" patch into this patchset.

Changes since v3:
 * Moved EDR related ACPI functions/definitions to pci-acpi.c
 * Modified commit history in few patches to include spec reference.
 * Added support to handle DPC triggered by NON_FATAL errors.
 * Added edr_lock to protect PCI device receiving duplicate EDR notifications.
 * Addressed Bjorn comments.

Changes since v2:
 * Split EDR support patch into multiple patches.
 * Addressed Bjorn comments.

Changes since v1:
 * Rebased on top of v5.1-rc1

Kuppuswamy Sathyanarayanan (5):
  PCI/ERR: Update error status after reset_link()
  PCI/DPC: Remove pcie_device reference from dpc_dev structure
  PCI/EDR: Export AER, DPC and error recovery functions
  PCI/DPC: Add Error Disconnect Recover (EDR) support
  PCI/ACPI: Enable EDR support

 drivers/acpi/pci_root.c   |  16 +++
 drivers/pci/pci-acpi.c    |   3 +
 drivers/pci/pci.h         |   8 ++
 drivers/pci/pcie/Kconfig  |  10 ++
 drivers/pci/pcie/Makefile |   1 +
 drivers/pci/pcie/aer.c    |  39 ++++--
 drivers/pci/pcie/dpc.c    |  92 ++++++++------
 drivers/pci/pcie/dpc.h    |  20 +++
 drivers/pci/pcie/edr.c    | 259 ++++++++++++++++++++++++++++++++++++++
 drivers/pci/pcie/err.c    |  36 ++++--
 drivers/pci/probe.c       |   1 +
 include/linux/acpi.h      |   6 +-
 include/linux/pci-acpi.h  |   8 ++
 include/linux/pci.h       |   1 +
 14 files changed, 442 insertions(+), 58 deletions(-)
 create mode 100644 drivers/pci/pcie/dpc.h
 create mode 100644 drivers/pci/pcie/edr.c

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2.21.0