In P9, OCC (On-Chip-Controller) supports shared memory based commad-response interface. Within the shared memory there is an OPAL command buffer and OCC response buffer that can be used to send inband commands to OCC. The following commands are supported:
1) Set system powercap 2) Set CPU-GPU power shifting ratio 3) Clear min/max for OCC sensor groups The skiboot patch for this interface is posted here: https://lists.ozlabs.org/pipermail/skiboot/2017-July/008352.html Shilpasri G Bhat (3): powernv: powercap: Add support for powercap framework powernv: Add support to set power-shifting-ratio powernv: Add support to clear sensor groups data arch/powerpc/include/asm/opal-api.h | 8 +- arch/powerpc/include/asm/opal.h | 9 + arch/powerpc/include/uapi/asm/opal-occ.h | 23 +++ arch/powerpc/platforms/powernv/Makefile | 2 +- arch/powerpc/platforms/powernv/opal-occ.c | 109 ++++++++++++ arch/powerpc/platforms/powernv/opal-powercap.c | 237 +++++++++++++++++++++++++ arch/powerpc/platforms/powernv/opal-psr.c | 169 ++++++++++++++++++ arch/powerpc/platforms/powernv/opal-wrappers.S | 5 + arch/powerpc/platforms/powernv/opal.c | 10 ++ 9 files changed, 570 insertions(+), 2 deletions(-) create mode 100644 arch/powerpc/include/uapi/asm/opal-occ.h create mode 100644 arch/powerpc/platforms/powernv/opal-occ.c create mode 100644 arch/powerpc/platforms/powernv/opal-powercap.c create mode 100644 arch/powerpc/platforms/powernv/opal-psr.c -- 1.8.3.1
