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Message-ID: <20200331152805.GA188783@google.com>
Date: Tue, 31 Mar 2020 10:28:05 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: sathyanarayanan.kuppuswamy@...ux.intel.com
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
ashok.raj@...el.com
Subject: Re: [PATCH v18 00/11] Add Error Disconnect Recover (EDR) support
On Mon, Mar 23, 2020 at 05:25:57PM -0700, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>
> 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 v17 + Bjorns changes:
> * This version is based on Bjorn's review/edr branch.
> * Moved {pciehp,shpchp}_is_native() function definitions to pci.c and
> removed it's CONFIG_ACPI dependency.
> * Modified dpc_reset_link() function to return PCI_ERS_RESULT_NEED_RESET
> when hotplug is not supported or enabled in kernel.
> * Modified reset_link() function to handle PCI_ERS_RESULT_NEED_RESET as
> valid return value.
> * Moved the implementation of reset_link() function to pcie_do_recovery()
> and renamed function callback parameter from reset_cb to reset_link.
> * Moved the order of pci_acpi_add_edr_notifier() and
> pci_acpi_remove_edr_notifier() calls in pci_acpi_setup() and
> pci_acpi_cleanup() above wakeup capable support checks.
> * Used acpi_check_dsm() to check whether given _DSM is supported or
> not in edr.c.
>
> 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
>
> Bjorn Helgaas (1):
> PCI/DPC: Move DPC data into struct pci_dev
>
> Kuppuswamy Sathyanarayanan (10):
> PCI/ERR: Update error status after reset_link()
> PCI: move {pciehp,shpchp}_is_native() definitions to pci.c
> PCI/DPC: Fix DPC recovery issue in non hotplug case
> PCI/ERR: Remove service dependency in pcie_do_recovery()
> PCI/ERR: Return status of pcie_do_recovery()
> PCI/DPC: Cache DPC capabilities in pci_init_capabilities()
> PCI/AER: Add pci_aer_raw_clear_status() to unconditionally clear Error
> Status
> PCI/DPC: Expose dpc_process_error(), dpc_reset_link() for use by EDR
> PCI/DPC: Add Error Disconnect Recover (EDR) support
> PCI/AER: Rationalize error status register clearing
Applied to pci/edr for v5.7, except these two:
PCI: move {pciehp,shpchp}_is_native() definitions to pci.c
PCI/DPC: Fix DPC recovery issue in non hotplug case
> Documentation/PCI/pcieaer-howto.rst | 23 +-
> drivers/acpi/pci_root.c | 15 ++
> drivers/net/ethernet/intel/ice/ice_main.c | 4 +-
> drivers/ntb/hw/idt/ntb_hw_idt.c | 4 +-
> drivers/pci/pci-acpi.c | 40 +---
> drivers/pci/pci.c | 40 +++-
> drivers/pci/pci.h | 13 +-
> drivers/pci/pcie/Kconfig | 10 +
> drivers/pci/pcie/Makefile | 1 +
> drivers/pci/pcie/aer.c | 40 ++--
> drivers/pci/pcie/dpc.c | 145 ++++++-------
> drivers/pci/pcie/edr.c | 251 ++++++++++++++++++++++
> drivers/pci/pcie/err.c | 67 ++----
> drivers/pci/pcie/portdrv.h | 5 -
> drivers/pci/pcie/portdrv_core.c | 21 --
> drivers/pci/probe.c | 2 +
> drivers/scsi/lpfc/lpfc_attr.c | 4 +-
> include/linux/acpi.h | 6 +-
> include/linux/aer.h | 9 +-
> include/linux/pci-acpi.h | 8 +
> include/linux/pci.h | 6 +
> include/linux/pci_hotplug.h | 7 +-
> 22 files changed, 471 insertions(+), 250 deletions(-)
> create mode 100644 drivers/pci/pcie/edr.c
>
> --
> 2.17.1
>
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