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| author | Yicong Yang <yangyicong@hisilicon.com> | 2022-08-16 13:44:13 +0200 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2022-09-09 02:41:22 +0200 |
| commit | a7112b747c324dda8937d4f47b14dc0af0b465d1 (patch) | |
| tree | 914d536c392b21f9e986dcbafc8a5bdc72b96abf /Documentation/ABI | |
| parent | hwtracing: hisi_ptt: Add tune function support for HiSilicon PCIe Tune and Tr... (diff) | |
| download | linux-a7112b747c324dda8937d4f47b14dc0af0b465d1.tar.xz linux-a7112b747c324dda8937d4f47b14dc0af0b465d1.zip | |
docs: trace: Add HiSilicon PTT device driver documentation
Document the introduction and usage of HiSilicon PTT device driver as well
as the sysfs attributes description provided by the driver.
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
[Fixed month and kernel version]
Link: https://lore.kernel.org/r/20220816114414.4092-5-yangyicong@huawei.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-hisi_ptt | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-hisi_ptt b/Documentation/ABI/testing/sysfs-devices-hisi_ptt new file mode 100644 index 000000000000..82de6d710266 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-hisi_ptt @@ -0,0 +1,61 @@ +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: This directory contains files for tuning the PCIe link + parameters(events). Each file is named after the event + of the PCIe link. + + See Documentation/trace/hisi-ptt.rst for more information. + +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_cpl +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: (RW) Controls the weight of Tx completion TLPs, which influence + the proportion of outbound completion TLPs on the PCIe link. + The available tune data is [0, 1, 2]. Writing a negative value + will return an error, and out of range values will be converted + to 2. The value indicates a probable level of the event. + +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_np +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: (RW) Controls the weight of Tx non-posted TLPs, which influence + the proportion of outbound non-posted TLPs on the PCIe link. + The available tune data is [0, 1, 2]. Writing a negative value + will return an error, and out of range values will be converted + to 2. The value indicates a probable level of the event. + +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_p +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: (RW) Controls the weight of Tx posted TLPs, which influence the + proportion of outbound posted TLPs on the PCIe link. + The available tune data is [0, 1, 2]. Writing a negative value + will return an error, and out of range values will be converted + to 2. The value indicates a probable level of the event. + +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune/rx_alloc_buf_level +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: (RW) Control the allocated buffer watermark for inbound packets. + The packets will be stored in the buffer first and then transmitted + either when the watermark reached or when timed out. + The available tune data is [0, 1, 2]. Writing a negative value + will return an error, and out of range values will be converted + to 2. The value indicates a probable level of the event. + +What: /sys/devices/hisi_ptt<sicl_id>_<core_id>/tune/tx_alloc_buf_level +Date: October 2022 +KernelVersion: 6.1 +Contact: Yicong Yang <yangyicong@hisilicon.com> +Description: (RW) Control the allocated buffer watermark of outbound packets. + The packets will be stored in the buffer first and then transmitted + either when the watermark reached or when timed out. + The available tune data is [0, 1, 2]. Writing a negative value + will return an error, and out of range values will be converted + to 2. The value indicates a probable level of the event. |