Commit Graph

2 Commits

Author SHA1 Message Date
Yang Li
947bb0d165 soc: qcom: icc-bwmon: Remove unnecessary print function dev_err()
Eliminate the follow coccicheck warning:
./drivers/soc/qcom/icc-bwmon.c:349:2-9: line 349 is redundant because platform_get_irq() already prints an error

Fixes: b9c2ae6cac ("soc: qcom: icc-bwmon: Add bandwidth monitoring driver")
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220714075532.104665-1-yang.lee@linux.alibaba.com
2022-07-18 16:34:11 -05:00
Krzysztof Kozlowski
b9c2ae6cac soc: qcom: icc-bwmon: Add bandwidth monitoring driver
Bandwidth monitoring (BWMON) sits between various subsytems like CPU,
GPU, Last Level caches and memory subsystem.  The BWMON can be
configured to monitor the data throuhput between memory and other
subsytems.  The throughput is measured within specified sampling window
and is used to vote for corresponding interconnect bandwidth.

Current implementation brings support for BWMON v4, used for example on
SDM845 to measure bandwidth between CPU (gladiator_noc) and Last Level
Cache (memnoc).  Usage of this BWMON allows to remove fixed bandwidth
votes from cpufreq (CPU nodes) thus achieve high memory throughput even
with lower CPU frequencies.

The driver was tested on SDM845.

Co-developed-by: Thara Gopinath <thara.gopinath@gmail.com>
Signed-off-by: Thara Gopinath <thara.gopinath@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220704121730.127925-3-krzysztof.kozlowski@linaro.org
2022-07-06 15:57:51 -05:00