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

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Message-ID: <35395249-7aeb-459c-9c78-2cfdaad2bb6a@quicinc.com>
Date: Tue, 26 Nov 2024 12:45:39 +0530
From: Nitesh Gupta <quic_nitegupt@...cinc.com>
To: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>,
        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>
Subject: Re: [PATCH v3 0/3] Add support for RAS DES feature in PCIe DW

Hi Shradha,

Can you please update on status of this Patch?

Are you going to take it up or is it fine for us to take it up?

-Nitesh Gupta

On 11/26/2024 10:47 AM, Krishna Chaitanya Chundru wrote:
>
> forgot to add the email in the previous mail.
>
> - Krishna chaitanya.
> 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
>>