linux-kernel - Re: [PATCH v2 0/3] Add support for RAS DES feature in PCIe DW controller

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Date:   Thu, 30 Nov 2023 22:25:14 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Shradha Todi <shradha.t@...sung.com>
Cc:     lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, josh@...htriplett.org,
        lukas.bulwahn@...il.com, hongxing.zhu@....com,
        pankaj.dubey@...sung.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Add support for RAS DES feature in PCIe DW
 controller

On Thu, Nov 30, 2023 at 05:20:41PM +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.
> 
> v1 version was posted long back and for some reasons I couldn't work on
> it. I apologize for the long break. I'm restarting this activity and
> have taken care of all previous review comments shared.
> v1: https://lore.kernel.org/all/20210518174618.42089-1-shradha.t@samsung.com/T/
> 

There is already a series floating to add similar functionality via perf
subsystem: https://lore.kernel.org/linux-pci/20231121013400.18367-1-xueshuai@linux.alibaba.com/

- Mani

> Shradha Todi (3):
>   PCI: dwc: Add support for vendor specific capability search
>   PCI: debugfs: Add support for RASDES framework in DWC
>   PCI: dwc: Create debugfs files in DWC driver
> 
>  drivers/pci/controller/dwc/Kconfig            |   8 +
>  drivers/pci/controller/dwc/Makefile           |   1 +
>  .../controller/dwc/pcie-designware-debugfs.c  | 476 ++++++++++++++++++
>  .../controller/dwc/pcie-designware-debugfs.h  |   0
>  drivers/pci/controller/dwc/pcie-designware.c  |  20 +
>  drivers/pci/controller/dwc/pcie-designware.h  |  18 +
>  6 files changed, 523 insertions(+)
>  create mode 100644 drivers/pci/controller/dwc/pcie-designware-debugfs.c
>  create mode 100644 drivers/pci/controller/dwc/pcie-designware-debugfs.h
> 
> -- 
> 2.17.1
> 

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