1.. SPDX-License-Identifier: GPL-2.0 2 3=========================================================================== 4Driver for Synopsys DesignWare PCIe traffic generator (also known as xData) 5=========================================================================== 6 7This driver should be used as a host-side (Root Complex) driver and Synopsys 8DesignWare prototype that includes this IP. 9 10The "dw-xdata-pcie" driver can be used to enable/disable PCIe traffic 11generator in either direction (mutual exclusion) besides allowing the 12PCIe link performance analysis. 13 14The interaction with this driver is done through the module parameter and 15can be changed in runtime. The driver outputs the requested command state 16information to /var/log/kern.log or dmesg. 17 18Request write TLPs traffic generation - Root Complex to Endpoint direction 19- Command: 20 echo 1 > /sys/class/misc/dw-xdata-pcie/write 21 22Get write TLPs traffic link throughput in MB/s 23- Command: 24 cat /sys/class/misc/dw-xdata-pcie/write 25- Output example: 26 204 27 28Request read TLPs traffic generation - Endpoint to Root Complex direction: 29- Command: 30 echo 1 > /sys/class/misc/dw-xdata-pcie/read 31 32Get read TLPs traffic link throughput in MB/s 33- Command: 34 cat /sys/class/misc/dw-xdata-pcie/read 35- Output example: 36 199 37 38Request to stop any current TLP transfer: 39- Command: 40 echo 1 > /sys/class/misc/dw-xdata-pcie/stop 41