linux-kernel - [PATCH v6 3/5] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

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Message-Id: <3ac165649570ce353e644f2b4c3f7473d72c7e23.1613150798.git.gustavo.pimentel@synopsys.com>
Date:   Fri, 12 Feb 2021 18:28:05 +0100
From:   Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
To:     linux-doc@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Subject: [PATCH v6 3/5] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

Add Documentation for dw-xdata-pcie driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
---
 Documentation/misc-devices/dw-xdata-pcie.rst | 40 ++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/misc-devices/dw-xdata-pcie.rst

diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst
new file mode 100644
index 00000000..3d241ae
--- /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/bus/pci/drivers/dw-xdata-pcie/.../write
+
+Get write TLPs traffic link throughput in MB/s
+- Command:
+        cat /sys/bus/pci/drivers/dw-xdata-pcie/.../write
+- Output example:
+	204
+
+Request read TLPs traffic generation - Endpoint to Root Complex direction:
+- Command:
+	echo 1 > /sys/bus/pci/drivers/dw-xdata-pcie/.../read
+
+Get read TLPs traffic link throughput in MB/s
+- Command:
+        cat /sys/bus/pci/drivers/dw-xdata-pcie/.../read
+- Output example:
+	199
+
+Request to stop any current TLP transfer:
+- Command:
+	echo 1 > /sys/bus/pci/drivers/dw-xdata-pcie/.../stop
-- 
2.7.4