linux-kernel - Re: [PATCH v5 0/4] Add support for RAS DES feature in PCIe DW

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Message-ID: <Z64EFN2QZ2AOF11I@ryzen>
Date: Thu, 13 Feb 2025 15:39:16 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Shradha Todi <shradha.t@...sung.com>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	manivannan.sadhasivam@...aro.org, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	jingoohan1@...il.com, Jonathan.Cameron@...wei.com,
	fan.ni@...sung.com, a.manzanares@...sung.com,
	pankaj.dubey@...sung.com, quic_nitegupt@...cinc.com,
	quic_krichai@...cinc.com, gost.dev@...sung.com
Subject: Re: [PATCH v5 0/4] Add support for RAS DES feature in PCIe DW

On Tue, Jan 21, 2025 at 04:44:17PM +0530, Shradha Todi wrote:
> DesignWare controller provides a vendor specific extended capability
> called RASDES as an IP feature. This extended capability  provides
> hardware information like:
>  - Debug registers to know the state of the link or controller. 
>  - Error injection mechanisms to inject various PCIe errors including
>    sequence number, CRC
>  - Statistical counters to know how many times a particular event
>    occurred
> 
> However, in Linux we do not have any generic or custom support to be
> able to use this feature in an efficient manner. This is the reason we
> are proposing this framework. Debug and bring up time of high-speed IPs
> are highly dependent on costlier hardware analyzers and this solution
> will in some ways help to reduce the HW analyzer usage.
> 
> The debugfs entries can be used to get information about underlying
> hardware and can be shared with user space. Separate debugfs entries has
> been created to cater to all the DES hooks provided by the controller.
> The debugfs entries interacts with the RASDES registers in the required
> sequence and provides the meaningful data to the user. This eases the
> effort to understand and use the register information for debugging.
> 
> v5:
>     - Addressed Fan's comment to split the patches for easier review
>     - Addressed Bjorn's comment to fix vendor specific cap search
>     - Addressed style related change requests from v4
>     - Added rasdes debugfs init call to common designware files for host
>       and EP.
> 
> v4: https://lore.kernel.org/lkml/20241206074456.17401-1-shradha.t@samsung.com/
>     - Addressed comments from Manivannan, Bjorn and Jonathan
>     - Addressed style related change requests from v3
>     - Added Documentation under Documentation/ABI/testing and kdoc stype
>       comments wherever required for better understanding
>     - Enhanced error injection to include all possible error groups
>     - Removed debugfs init call from common designware file and left it
>       up to individual platform drivers to init/deinit as required.
> 
> v3: https://lore.kernel.org/all/20240625093813.112555-1-shradha.t@samsung.com/
>     - v2 had suggestions about moving this framework to perf/EDAC instead of a
>       controller specific debugfs but after discussions we decided to go ahead
>       with the same. Rebased and posted v3 with minor style changes.
> 
> v2: https://lore.kernel.org/lkml/20231130115044.53512-1-shradha.t@samsung.com/
>     - Addressed comments from Krzysztof Wilczyński, Bjorn Helgaas and
>       posted v2 with a changed implementation for a better code design
> 
> v1: https://lore.kernel.org/all/20210518174618.42089-1-shradha.t@samsung.com/T/
> 
> Shradha Todi (4):
>   PCI: dwc: Add support for vendor specific capability search
>   Add debugfs based silicon debug support in DWC
>   Add debugfs based error injection support in DWC
>   Add debugfs based statistical counter support in DWC
> 
>  Documentation/ABI/testing/debugfs-dwc-pcie    | 144 +++++
>  drivers/pci/controller/dwc/Kconfig            |  10 +
>  drivers/pci/controller/dwc/Makefile           |   1 +
>  .../controller/dwc/pcie-designware-debugfs.c  | 561 ++++++++++++++++++
>  .../pci/controller/dwc/pcie-designware-ep.c   |   5 +
>  .../pci/controller/dwc/pcie-designware-host.c |   6 +
>  drivers/pci/controller/dwc/pcie-designware.c  |  19 +
>  drivers/pci/controller/dwc/pcie-designware.h  |  16 +
>  8 files changed, 762 insertions(+)
>  create mode 100644 Documentation/ABI/testing/debugfs-dwc-pcie
>  create mode 100644 drivers/pci/controller/dwc/pcie-designware-debugfs.c
> 
> -- 
> 2.17.1
> 

Shradha,

Thank you for this awesome feature!

It would be great if we could get it included in v6.15.

Are you intending to send out a v6?


Kind regards,
Niklas