[RESEND,v3,4/5] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

Commit Message

Gustavo Pimentel Feb. 2, 2021, 4:56 p.m. UTC

Add Documentation for dw-xdata-pcie driver.

Signed-off-by: Gustavo Pimentel <[e-mail]>
---
 Documentation/misc-devices/dw-xdata-pcie.rst | 40 ++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/misc-devices/dw-xdata-pcie.rst

Patch

diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst
new file mode 100644
index 00000000..3af9fad
--- /dev/null
+++ b/Documentation/misc-devices/dw-xdata-pcie.rst
@@ -0,0 +1,40 @@ 
+.. 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/kernel/dw-xdata-pcie/write
+
+Get write TLPs traffic link throughput
+- Command:
+        cat /sys/kernel/dw-xdata-pcie/write
+- Output example:
+	204 MB/s
+
+Request read TLPs traffic generation - Endpoint to Root Complex direction:
+- Command:
+	echo 1 > /sys/kernel/dw-xdata-pcie/read
+
+Get read TLPs traffic link throughput
+- Command:
+        cat /sys/kernel/dw-xdata-pcie/read
+- Output example:
+	199 MB/s
+
+Request to stop any current TLP transfer:
+- Command:
+	echo 1 > /sys/kernel/dw-xdata-pcie/stop