Removes old information related to the stop file interface in sysfs left by mistake during patch revision. Improves the document text format to be more user-friendly and adds basic driver related information, such as support, datasheet, and author. Signed-off-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx> --- Documentation/misc-devices/dw-xdata-pcie.rst | 76 ++++++++++++++++++---------- 1 file changed, 50 insertions(+), 26 deletions(-) diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst index cbc9f69..781c679 100644 --- a/Documentation/misc-devices/dw-xdata-pcie.rst +++ b/Documentation/misc-devices/dw-xdata-pcie.rst @@ -4,37 +4,61 @@ Driver for Synopsys DesignWare PCIe traffic generator (also known as xData) =========================================================================== +Supported chips: +Synopsys DesignWare PCIe prototype solution + +Datasheet: +Not freely available + +Author: +Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx> + +Description +----------- + This driver should be used as a host-side (Root Complex) driver and Synopsys DesignWare prototype that includes this IP. -The "dw-xdata-pcie" driver can be used to enable/disable PCIe traffic +The dw-xdata-pcie driver can be used to enable/disable PCIe traffic generator in either direction (mutual exclusion) besides allowing the PCIe link performance analysis. The interaction with this driver is done through the module parameter and can be changed in runtime. The driver outputs the requested command state -information to /var/log/kern.log or dmesg. - -Request write TLPs traffic generation - Root Complex to Endpoint direction -- Command: -echo 1 > /sys/class/misc/dw-xdata-pcie/write - -Get write TLPs traffic link throughput in MB/s -- Command: -cat /sys/class/misc/dw-xdata-pcie/write -- Output example: -204 - -Request read TLPs traffic generation - Endpoint to Root Complex direction: -- Command: -echo 1 > /sys/class/misc/dw-xdata-pcie/read - -Get read TLPs traffic link throughput in MB/s -- Command: -cat /sys/class/misc/dw-xdata-pcie/read -- Output example: -199 - -Request to stop any current TLP transfer: -- Command: -echo 1 > /sys/class/misc/dw-xdata-pcie/stop +information to ``/var/log/kern.log`` or dmesg. + +Example +------- + +Write TLPs traffic generation - Root Complex to Endpoint direction +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Generate traffic:: + + # echo 1 > /sys/class/misc/dw-xdata-pcie.0/write + +Get link throughput in MB/s:: + + # cat /sys/class/misc/dw-xdata-pcie.0/write + 204 + +Stop traffic in any direction:: + + # echo 0 > /sys/class/misc/dw-xdata-pcie.0/write + +Read TLPs traffic generation - Endpoint to Root Complex direction +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Generate traffic:: + + # echo 1 > /sys/class/misc/dw-xdata-pcie.0/read + +Get link throughput in MB/s:: + + # cat /sys/class/misc/dw-xdata-pcie.0/read + 199 + +Stop traffic in any direction:: + + # echo 0 > /sys/class/misc/dw-xdata-pcie.0/read + -- 2.7.4
