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 v16: * Removed reset_link from pcie_port_service_driver. * Removed pcie_port_find_service(). * Added pci_dpc_init() in pci_init_capabilities(). Changes since v15: * Splitted Patch # 3 in previous set into multiple patches. * Refactored EDR driver use pci_dev instead of dpc_dev. * Added some debug logs to EDR driver. * Used pci_aer_raw_clear_status() for clearing AER errors in EDR path. * Addressed other comments from Bjorn. * Rebased patches on top of Bjorns "PCI/DPC: Move data to struct pci_dev" patch. 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 (12): PCI/ERR: Update error status after reset_link() PCI/AER: Move pci_cleanup_aer_error_status_regs() declaration to pci.h PCI/ERR: Remove service dependency in pcie_do_recovery() PCI: portdrv: remove unnecessary pcie_port_find_service() PCI: portdrv: remove reset_link member from pcie_port_service_driver Documentation: PCI: Remove reset_link references PCI/ERR: Return status of pcie_do_recovery() PCI/DPC: Cache DPC capabilities in pci_init_capabilities() PCI/AER: Allow clearing Error Status Register in FF mode PCI/DPC: Export DPC error recovery functions PCI/DPC: Add Error Disconnect Recover (EDR) support PCI/ACPI: Enable EDR support Documentation/PCI/pcieaer-howto.rst | 25 ++- drivers/acpi/pci_root.c | 16 ++ drivers/pci/pci-acpi.c | 3 + drivers/pci/pci.h | 16 +- drivers/pci/pcie/Kconfig | 10 ++ drivers/pci/pcie/Makefile | 1 + drivers/pci/pcie/aer.c | 34 ++-- drivers/pci/pcie/dpc.c | 47 ++++-- drivers/pci/pcie/edr.c | 251 ++++++++++++++++++++++++++++ drivers/pci/pcie/err.c | 26 +-- drivers/pci/pcie/portdrv.h | 5 - drivers/pci/pcie/portdrv_core.c | 21 --- drivers/pci/probe.c | 2 + include/linux/acpi.h | 6 +- include/linux/aer.h | 5 - include/linux/pci-acpi.h | 8 + include/linux/pci.h | 1 + 17 files changed, 389 insertions(+), 88 deletions(-) create mode 100644 drivers/pci/pcie/edr.c -- 2.25.1
