linux-kernel - Re: [PATCH v14 0/5] Add Error Disconnect Recover (EDR) support

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Message-ID: <3d24296d-5bba-ee37-17d2-3a378b230f63@linux.intel.com>
Date:   Wed, 12 Feb 2020 09:26:58 -0800
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com
Subject: Re: [PATCH v14 0/5] Add Error Disconnect Recover (EDR) support

Hi Bjorn,

On 2/12/20 6:38 AM, Bjorn Helgaas wrote:
> On Fri, Feb 07, 2020 at 04:03:30PM -0800, 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
> Hi Sathy,
>
> Bad timing!  Linus tagged v5.6-rc1 on Feb 9, shortly after you posted
> this.  Would you mind refreshing this so it applies on my "master"
> branch (v5.6-rc1)?
Sure.
>
>> 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    |  35 ++++--
>>   drivers/pci/probe.c       |   1 +
>>   include/linux/acpi.h      |   6 +-
>>   include/linux/pci-acpi.h  |   8 ++
>>   include/linux/pci.h       |   1 +
>>   14 files changed, 441 insertions(+), 58 deletions(-)
>>   create mode 100644 drivers/pci/pcie/dpc.h
>>   create mode 100644 drivers/pci/pcie/edr.c
>>
>> -- 
>> 2.21.0
>>
-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer