On 7/27/21 10:29 AM, Thara Gopinath wrote: > > > On 7/21/21 11:14 PM, Steev Klimaszewski wrote: >> Hi Thara! >> >> On 7/8/21 7:06 AM, Thara Gopinath wrote: >>> Limits Management Hardware(LMh) is a hardware infrastructure on some >>> Qualcomm SoCs that can enforce temperature and current limits as >>> programmed >>> by software for certain IPs like CPU. On many newer SoCs LMh is >>> configured >>> by firmware/TZ and no programming is needed from the kernel side. >>> But on >>> certain SoCs like sdm845 the firmware does not do a complete >>> programming of >>> the h/w block. On such SoCs kernel software has to explicitly set up >>> the >>> temperature limits and turn on various monitoring and enforcing >>> algorithms >>> on the hardware. >>> >>> Introduce support for enabling and programming various limit >>> settings and >>> monitoring capabilities of Limits Management Hardware(LMh) >>> associated with >>> cpu clusters. Also introduce support in cpufreq hardware driver to >>> monitor >>> the interrupt associated with cpu frequency throttling so that this >>> information can be conveyed to the schdeuler via thermal pressure >>> interface. >>> >>> With this patch series following cpu performance improvement(30-70%) is >>> observed on sdm845. The reasoning here is that without LMh being >>> programmed >>> properly from the kernel, the default settings were enabling thermal >>> mitigation for CPUs at too low a temperature (around 70-75 degree >>> C). This >>> in turn meant that many a time CPUs were never actually allowed to >>> hit the >>> maximum possible/required frequencies. >>> >>> UnixBench whets and dhry (./Run whets dhry) >>> System Benchmarks Index Score >>> >>> Without LMh Support With LMh Support >>> 1 copy test 1353.7 1773.2 >>> >>> 8 copy tests 4473.6 7402.3 >>> >>> Sysbench cpu >>> sysbench cpu --threads=8 --time=60 --cpu-max-prime=100000 run >>> >>> Without LMh Support With LMh Support >>> Events per >>> second 355 614 >>> >>> Avg Latency(ms) 21.84 13.02 >>> >>> v2->v3: >>> - Included patch adding dt binding documentation for LMh nodes. >>> - Rebased to v5.13 >>> >>> Thara Gopinath (6): >>> firmware: qcom_scm: Introduce SCM calls to access LMh >>> thermal: qcom: Add support for LMh driver >>> cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support >>> arm64: boot: dts: qcom: sdm45: Add support for LMh node >>> arm64: boot: dts: qcom: sdm845: Remove cpufreq cooling devices >>> for CPU >>> thermal zones >>> dt-bindings: thermal: Add dt binding for QCOM LMh >>> >>> .../devicetree/bindings/thermal/qcom-lmh.yaml | 100 ++++++++ >>> arch/arm64/boot/dts/qcom/sdm845.dtsi | 162 ++---------- >>> drivers/cpufreq/qcom-cpufreq-hw.c | 118 +++++++++ >>> drivers/firmware/qcom_scm.c | 58 +++++ >>> drivers/firmware/qcom_scm.h | 4 + >>> drivers/thermal/qcom/Kconfig | 10 + >>> drivers/thermal/qcom/Makefile | 1 + >>> drivers/thermal/qcom/lmh.c | 239 >>> ++++++++++++++++++ >>> include/linux/qcom_scm.h | 14 + >>> 9 files changed, 570 insertions(+), 136 deletions(-) >>> create mode 100644 >>> Documentation/devicetree/bindings/thermal/qcom-lmh.yaml >>> create mode 100644 drivers/thermal/qcom/lmh.c >>> >> I've been using these patches on a 5.13 kernel >> (https://github.com/steev/linux/tree/linux-5.13.y - while trying to >> track down a different issue, while playing a video on youtube, as well >> as compressing a 9.2GB file with xz, I got the following > > Hi Steev, > > Thanks for testing this. I was unable to reproduce this. I have posted > v4 moving the interrupt handling in qcom-cpufreq-hw to threaded > interrupt handler and hopefully this should fix the issue. It will be > great if you can test and let me know. > Hi Thara, I've been testing v4 for a little bit here, and so far I can't seem to get it to reproduce anymore. I will keep trying but fingers crossed that that did the trick. For setup, I'm using https://github.com/steev/linux/tree/linux-5.13.y with the "distro_defconfig" configuration here on my c630s. I'm also running https://github.com/steev/scheduler as a systemd service. So far I've been able to sleep/suspend without issue while running "make -j$(nproc) deb-pkg" in those kernel sources as well as `xz --memlimit-compress=50 -T 4 imagefile.img" on a 9.2GB file at the same time. One system is running the Budgie desktop on top of Xorg, and the other is running Gnome 3.38 on top of Wayland. -- steev
