On Fri, Apr 07, 2023 at 07:34:34PM +0530, Souradeep Chowdhury wrote: > Qualcomm's proprietary Android boot-loaders capture boot time > stats, like the time when the bootloader started execution and at what > point the bootloader handed over control to the kernel etc. in the IMEM > region. This information is captured in a specific format by this driver > by mapping a structure to the IMEM memory region and then accessing the > members of the structure to print the information. This information is > useful in verifying if existing boot KPIs have regressed or not. > A sample log in SM8450(waipio) device is as follows:- > > KPI: Pre ABL Time = 3s > KPI: ABL Time = 14s > KPI: Kernel MPM timestamp = 890206 > > The Module Power Manager(MPM) sleep counter starts ticking at the PBL > stage and the timestamp generated by the sleep counter is logged by > the Qualcomm proprietary bootloader(ABL) at two points-> First when it > starts execution which is logged here as "Pre ABL Time" and the second > when it is about to load the kernel logged as "ABL Time". Both these > values are read up by the driver from IMEM region and printed as above. > The current sleep counter timestamp is also logged by the driver. > > Changes in V2 > > *Implemented comments on version 1 of the patch This doesn't give a particular good indication of what you actually changed. So please spell it out going forward. Thanks, Bjorn > > *Changed the boot_stats driver to module_platform_driver > > *Dropped the DT binding for mpm sleep counter > > Souradeep Chowdhury (3): > dt-bindings: sram: qcom,imem: Add Boot Stat region within IMEM > soc: qcom: boot_stat: Add Driver Support for Boot Stats > MAINTAINERS: Add the entry for boot_stats driver support > > .../devicetree/bindings/sram/qcom,imem.yaml | 21 +++++ > MAINTAINERS | 6 ++ > drivers/soc/qcom/Kconfig | 7 ++ > drivers/soc/qcom/Makefile | 1 + > drivers/soc/qcom/boot_stats.c | 95 ++++++++++++++++++++++ > 5 files changed, 130 insertions(+) > create mode 100644 drivers/soc/qcom/boot_stats.c > > -- > 2.7.4 >
