Re: [Patch v3 0/6] Introduce LMh driver for Qualcomm SoCs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





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.

--
Warm Regards
Thara (She/Her/Hers)







[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux