linux-kernel - Re: [PATCH v6 0/4] Add support for debugfs based RAS DES feature in PCIe DW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z7YYzdN-MboQKIt-@ryzen>
Date: Wed, 19 Feb 2025 18:45:49 +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, nifan.cxl@...il.com, a.manzanares@...sung.com,
	pankaj.dubey@...sung.com, 18255117159@....com,
	quic_nitegupt@...cinc.com, quic_krichai@...cinc.com,
	gost.dev@...sung.com
Subject: Re: [PATCH v6 0/4] Add support for debugfs based RAS DES feature in
 PCIe DW

On Fri, Feb 14, 2025 at 04:20:03PM +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.
> 
> This series creates a generic debugfs framework for DesignWare PCIe
> controllers where other debug features apart from RASDES can also be
> added as and when required.

FWIW, for the series:
Tested-by: Niklas Cassel <cassel@...nel.org>