linux-kernel - [PATCH v11 2/4] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

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Date:   Tue,  6 Apr 2021 19:26:47 +0200
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>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Subject: [PATCH v11 2/4] 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 | 64 ++++++++++++++++++++++++++++
 Documentation/misc-devices/index.rst         |  1 +
 2 files changed, 65 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..a956e1a
--- /dev/null
+++ b/Documentation/misc-devices/dw-xdata-pcie.rst
@@ -0,0 +1,64 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================================================
+Driver for Synopsys DesignWare PCIe traffic generator (also known as xData)
+===========================================================================
+
+Supported chips:
+Synopsys DesignWare PCIe prototype solution
+
+Data sheet:
+Not freely available
+
+Author:
+Gustavo Pimentel <gustavo.pimentel@...opsys.com>
+
+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
+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.
+
+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
+
diff --git a/Documentation/misc-devices/index.rst b/Documentation/misc-devices/index.rst
index 64420b331..30ac58f 100644
--- a/Documentation/misc-devices/index.rst
+++ b/Documentation/misc-devices/index.rst
@@ -19,6 +19,7 @@ fit into other categories.
    bh1770glc
    eeprom
    c2port
+   dw-xdata-pcie
    ibmvmc
    ics932s401
    isl29003
-- 
2.7.4