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[0/4] soc/PM/arm64: qcom: Add initial version of bwmon

Message ID 20220502174046.139234-1-krzysztof.kozlowski@linaro.org
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Series soc/PM/arm64: qcom: Add initial version of bwmon | expand

Message

Krzysztof Kozlowski May 2, 2022, 5:40 p.m. UTC 
Hi,

BWMON is a data bandwidth monitor providing throughput/bandwidth over certain
interconnect links in a SoC.  It might be used to gather current bus usage and
vote for interconnect bandwidth, thus adjusting the bus speed based on actual
usage.

The work is built on top of Thara Gopinath's patches with several cleanups,
changes and simplifications.

This is "initial version", which means the work is not finished.  The goal is
to add support for further devices (version 5 of bwmon) and usage of devfreq
governors, similarly to tegra30 devfreq driver.

Best regards,
Krzysztof

Krzysztof Kozlowski (4):
  dt-bindings: interconnect: qcom,sdm845-cpu-bwmon: add BWMON device
  opp: Add apis to retrieve opps with interconnect bandwidth
  soc: qcom: icc-bwmon: Add bandwidth monitoring driver
  arm64: dts: qcom: sdm845: Add CPU BWMON

 .../interconnect/qcom,sdm845-cpu-bwmon.yaml   | 105 ++++++
 MAINTAINERS                                   |   7 +
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |  60 ++++
 drivers/opp/core.c                            | 120 +++++++
 drivers/soc/qcom/Kconfig                      |  10 +
 drivers/soc/qcom/Makefile                     |   1 +
 drivers/soc/qcom/icc-bwmon.c                  | 328 ++++++++++++++++++
 include/linux/pm_opp.h                        |  19 +
 8 files changed, 650 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,sdm845-cpu-bwmon.yaml
 create mode 100644 drivers/soc/qcom/icc-bwmon.c

Comments

Krzysztof Kozlowski May 2, 2022, 6:20 p.m. UTC | #1 
On 02/05/2022 19:40, Krzysztof Kozlowski wrote:
> Bandwidth monitoring h/w sits between various subsytems like cpu, gpu
> etc and ddr subsystem. This h/w can be configured to monitor the data
> traffic between ddr and other subsytems. The bandwidth values obtained
> from this monitoring is used to bump up or down the corresponding
> interconnect speeds.


(...)

> +
> +MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>")

I should have checked last minute changes if they compile...


> +MODULE_DESCRIPTION("QCOM BWMON driver");
> +MODULE_LICENSE("GPL");


Best regards,
Krzysztof