projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e1181b5b GP |
1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | =========================================================================== | |
| 4 | Driver for Synopsys DesignWare PCIe traffic generator (also known as xData) | |
| 5 | =========================================================================== | |
| 6 | ||
| 23188e0d GP |
7 | Supported chips: |
| 8 | Synopsys DesignWare PCIe prototype solution | |
| 9 | ||
| 10 | Datasheet: | |
| 11 | Not freely available | |
| 12 | ||
| 13 | Author: | |
| 14 | Gustavo Pimentel <gustavo.pimentel@synopsys.com> | |
| 15 | ||
| 16 | Description | |
| 17 | ----------- | |
| 18 | ||
| e1181b5b GP |
19 | This driver should be used as a host-side (Root Complex) driver and Synopsys |
| 20 | DesignWare prototype that includes this IP. | |
| 21 | ||
| 23188e0d | 22 | The dw-xdata-pcie driver can be used to enable/disable PCIe traffic |
| e1181b5b GP |
23 | generator in either direction (mutual exclusion) besides allowing the |
| 24 | PCIe link performance analysis. | |
| 25 | ||
| 26 | The interaction with this driver is done through the module parameter and | |
| 27 | can be changed in runtime. The driver outputs the requested command state | |
| 23188e0d GP |
28 | information to ``/var/log/kern.log`` or dmesg. |
| 29 | ||
| 30 | Example | |
| 31 | ------- | |
| 32 | ||
| 33 | Write TLPs traffic generation - Root Complex to Endpoint direction | |
| 34 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 35 | ||
| 36 | Generate traffic:: | |
| 37 | ||
| 38 | # echo 1 > /sys/class/misc/dw-xdata-pcie.0/write | |
| 39 | ||
| 40 | Get link throughput in MB/s:: | |
| 41 | ||
| 42 | # cat /sys/class/misc/dw-xdata-pcie.0/write | |
| 43 | 204 | |
| 44 | ||
| 45 | Stop traffic in any direction:: | |
| 46 | ||
| 47 | # echo 0 > /sys/class/misc/dw-xdata-pcie.0/write | |
| 48 | ||
| 49 | Read TLPs traffic generation - Endpoint to Root Complex direction | |
| 50 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 51 | ||
| 52 | Generate traffic:: | |
| 53 | ||
| 54 | # echo 1 > /sys/class/misc/dw-xdata-pcie.0/read | |
| 55 | ||
| 56 | Get link throughput in MB/s:: | |
| 57 | ||
| 58 | # cat /sys/class/misc/dw-xdata-pcie.0/read | |
| 59 | 199 | |
| 60 | ||
| 61 | Stop traffic in any direction:: | |
| 62 | ||
| 63 | # echo 0 > /sys/class/misc/dw-xdata-pcie.0/read | |
| 64 |