linux-kernel - Re: [PATCH v3 0/3] Add support for RAS DES feature in PCIe DW

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Message-ID: <cc403025-d7ac-27dc-21c1-59dba1b724fa@quicinc.com>
Date: Tue, 26 Nov 2024 10:46:24 +0530
From: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To: Shradha Todi <shradha.t@...sung.com>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>
CC: <manivannan.sadhasivam@...aro.org>, <lpieralisi@...nel.org>,
        <kw@...ux.com>, <robh@...nel.org>, <bhelgaas@...gle.com>,
        <jingoohan1@...il.com>, <fancer.lancer@...il.com>,
        <yoshihiro.shimoda.uh@...esas.com>, <conor.dooley@...rochip.com>,
        <pankaj.dubey@...sung.com>, <gost.dev@...sung.com>,
        <",quic_nitegupt"@quicinc.com>
Subject: Re: [PATCH v3 0/3] Add support for RAS DES feature in PCIe DW

+cc nitesh

On 6/25/2024 3:08 PM, 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.
> 
> v2: https://lore.kernel.org/lkml/20240319163315.GD3297@thinkpad/T/
> 
> v1: https://lore.kernel.org/all/20210518174618.42089-1-shradha.t@samsung.com/T/
> 
> 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  | 474 ++++++++++++++++++
>   .../controller/dwc/pcie-designware-debugfs.h  |   0
>   .../pci/controller/dwc/pcie-designware-host.c |   2 +
>   drivers/pci/controller/dwc/pcie-designware.c  |  20 +
>   drivers/pci/controller/dwc/pcie-designware.h  |  18 +
>   7 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
>