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/ 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
