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powerpc/powernv: Add support to set power-shifting-ratio

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This patch adds support to set power-shifting-ratio which hints the
firmware how to distribute/throttle power between different entities
in a system (e.g CPU v/s GPU). This ratio is used by OCC for power
capping algorithm.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Shilpasri G Bhat
2017-08-10 09:01:19 +05:30
committed by Michael Ellerman
parent cb8b340de2
commit 8e84b2d1f0
7 changed files with 204 additions and 1 deletions
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18
Documentation/ABI/testing/sysfs-firmware-opal-psr Normal file
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What: /sys/firmware/opal/psr
Date: August 2017
Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
Description: Power-Shift-Ratio directory for Powernv P9 servers
Power-Shift-Ratio allows to provide hints the firmware
to shift/throttle power between different entities in
the system. Each attribute in this directory indicates
a settable PSR.
What: /sys/firmware/opal/psr/cpu_to_gpu_X
Date: August 2017
Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
Description: PSR sysfs attributes for Powernv P9 servers
Power-Shift-Ratio between CPU and GPU for a given chip
with chip-id X. This file gives the ratio (0-100)
which is used by OCC for power-capping.