> -----Original Message----- > From: Niklas Cassel <cassel@xxxxxxxxxx> > Sent: 19 February 2025 23:16 > To: Shradha Todi <shradha.t@xxxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; manivannan.sadhasivam@xxxxxxxxxx; lpieralisi@xxxxxxxxxx; > kw@xxxxxxxxx; robh@xxxxxxxxxx; bhelgaas@xxxxxxxxxx; jingoohan1@xxxxxxxxx; Jonathan.Cameron@xxxxxxxxxx; > fan.ni@xxxxxxxxxxx; nifan.cxl@xxxxxxxxx; a.manzanares@xxxxxxxxxxx; pankaj.dubey@xxxxxxxxxxx; 18255117159@xxxxxxx; > quic_nitegupt@xxxxxxxxxxx; quic_krichai@xxxxxxxxxxx; gost.dev@xxxxxxxxxxx > 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@xxxxxxxxxx> Hey Niklas, sent out v7 with a few minor modifications. Would be great if you could test that :)
