linux/Documentation/misc-devices/dw-xdata-pcie.rst
Gustavo Pimentel 23188e0d45 dw-xdata-pcie: Update outdated info and improve text format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 <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/4e72f931474a784d478e5a67961ecf116911997a.1618066164.git.gustavo.pimentel@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-14 19:47:28 +02:00

65 lines
1.6 KiB
ReStructuredText

.. SPDX-License-Identifier: GPL-2.0
===========================================================================
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 <gustavo.pimentel@synopsys.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