README

This is a source package for intel-speed-select utility for building
outside of the linux kernel source tree.

This source is same as what can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
under tools/power/x86/intel-speed-select folder. But there is a lag
in merging to mainline linux git, so they may differ for some time.

This utility can always be built from the kernel source tree.
Some users prefer building outside the kernel source tree. So there
is a difference in Makefile.

To build this source, you need "gcc" and "make" commands on your platform.
Download the *.tar.gz file and use tar xvf to decompress.
Then simply use "make".

Sample usage:
- Install libnl-genl-3-dev
For Fedora/CenOS
	dnf install libnl3-devel
For Ubuntu
	apt install libnl-3-dev libnl-genl-3-dev

- Download the zip file by selecting "Code" and download zip file.
For example if the downloaded zip is
intel-speed-select-utility-src-packages-34de5f67f4a369b040a5a74b0ae3103c0abd2535.zip
Then
$ unzip intel-speed-select-utility-src-packages-34de5f67f4a369b040a5a74b0ae3103c0abd2535.zip
$ cd intel-speed-select-utility-src-packages-34de5f67f4a369b040a5a74b0ae3103c0abd2535
$ tar xvf intel-speed-select-v1.5-rc1.tar.gz
$ cd intel-speed-select-
$ make
This will build the "intel-speed-select" folder.

Version history:
v1.21:
Fix restoring TRL after SST-TF disable

v1.20:
Set TRL MSR in 100 MHz units

v1.19:
See the commit log

v1.11
- Fix base-freq enable with auto mode when turbo disabled from BIOS

v1.10
- Fix for memory frequency display

v1.9
- Support increased number of CPUs
- Return error when mailbox commmand fails to enable core-power
- Option to online all CPUs
- Remove build date and time print

v1.8
- Set scaling_max_freq to base-freq to take care of issue with BIOS disable turbo
and kernel changes post 5.8 for setting HWP.max to HWP.guarantee.
- Add new commands for turbo-mode disable/enable and set-trl`

v1.6
- Processing of failure of mailbox command to get core mask during
change config level with -o option

v1.7
- For fixing issue when there is no die_id syfs and TRL display
from mailbox when there is no SST-PP present on non Skylake based
systems.

v1.5
  Change to debug print only for the message for mailbox retry failures.
v1.5-rc1
- Add retries for mail box commands: On failure mailbox commands are retried for 3 times.
User can use -r option to change retry count.
- Add option to delay mbox commands: Use -p command to add delay between two mail box
commands in millisecond. For example: -p 1000 for 1000 ms delay.
- Ignore -o option processing on mail box command error for changing config level
- Change path for caching topology info: This changes the cache file path to
/var/run which should be refreshed after reboot