From 23188e0d45c505b9c3175121855b793578ee50f0 Mon Sep 17 00:00:00 2001 From: Gustavo Pimentel Date: Sat, 10 Apr 2021 16:52:59 +0200 Subject: [PATCH] dw-xdata-pcie: Update outdated info and improve text format Removes old information related to the stop file interface in sysfs left by mistake during patch revision.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 Link: https://lore.kernel.org/r/4e72f931474a784d478e5a67961ecf116911997a.1618066164.git.gustavo.pimentel@synopsys.com Signed-off-by: Greg Kroah-Hartman --- Documentation/misc-devices/dw-xdata-pcie.rst | 66 +++++++++++++------- 1 file changed, 45 insertions(+), 21 deletions(-) diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst index cbc9f694d406..781c6794a506 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 + +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. +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 +Example +------- -Get write TLPs traffic link throughput in MB/s -- Command: -cat /sys/class/misc/dw-xdata-pcie/write -- Output example: -204 +Write TLPs traffic generation - Root Complex to Endpoint direction +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Request read TLPs traffic generation - Endpoint to Root Complex direction: -- Command: -echo 1 > /sys/class/misc/dw-xdata-pcie/read +Generate traffic:: -Get read TLPs traffic link throughput in MB/s -- Command: -cat /sys/class/misc/dw-xdata-pcie/read -- Output example: -199 + # 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 -Request to stop any current TLP transfer: -- Command: -echo 1 > /sys/class/misc/dw-xdata-pcie/stop