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@xxxxxxxxxxx/T/ > There is already a series floating to add similar functionality via perf subsystem: https://lore.kernel.org/linux-pci/20231121013400.18367-1-xueshuai@xxxxxxxxxxxxxxxxx/ - 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 > -- மணிவண்ணன் சதாசிவம்
