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authorShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>2017-08-10 06:31:19 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-08-10 15:40:01 +0300
commit8e84b2d1f0f6a00b6476790f7bce6dcbffe91980 (patch)
treef348d51b13bf87653605b18e9dbd6be21e518e29 /Documentation/ABI/testing/sysfs-firmware-opal-psr
parentcb8b340de21e1c57e1c6d4f26ccc4af46a3ed559 (diff)
downloadlinux-8e84b2d1f0f6a00b6476790f7bce6dcbffe91980.tar.xz
powerpc/powernv: Add support to set power-shifting-ratio
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>
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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.