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[v7,3/5] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

Message ID b33004edd3f41d3f1c8b9696e3af91719c8b4e69.1616814273.git.gustavo.pimentel@synopsys.com (mailing list archive)
State Superseded
Headers show
Series misc: Add Add Synopsys DesignWare xData IP driver | expand

Commit Message

Gustavo Pimentel March 27, 2021, 3:06 a.m. UTC 
Add Documentation for dw-xdata-pcie driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
 Documentation/misc-devices/dw-xdata-pcie.rst | 40 ++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/misc-devices/dw-xdata-pcie.rst
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diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst
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+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================================================
+Driver for Synopsys DesignWare PCIe traffic generator (also known as xData)
+===========================================================================
+
+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
+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