diff options
author | Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> | 2017-07-28 00:45:29 +0530 |
---|---|---|
committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-07-28 14:53:19 +1000 |
commit | 5bec6cdf92f984cccc09dbe57579760a6e593b79 (patch) | |
tree | 97b5725aa4ea39a0513f7992083e9c813c8bfb33 /core/psr.c | |
parent | c6aabe3f2eb51cf1df7da83432b15a37200f1adb (diff) | |
download | skiboot-5bec6cdf92f984cccc09dbe57579760a6e593b79.zip skiboot-5bec6cdf92f984cccc09dbe57579760a6e593b79.tar.gz skiboot-5bec6cdf92f984cccc09dbe57579760a6e593b79.tar.bz2 |
psr: occ: Add support to change power-shifting-ratio
Add support to set the CPU-GPU power shifting ratio which is used by
the OCC power capping algorithm. PSR value of 100 takes all power away
from CPU first and a PSR value of 0 caps GPU first.
Documentation enhanced by Stewart Smith.
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'core/psr.c')
-rw-r--r-- | core/psr.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/core/psr.c b/core/psr.c new file mode 100644 index 0000000..d3ff6ac --- /dev/null +++ b/core/psr.c @@ -0,0 +1,42 @@ +/* Copyright 2017 IBM Corp. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + * implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <psr.h> + +static int opal_get_power_shift_ratio(u32 handle, int token __unused, + u32 *ratio) +{ + if (!ratio || !opal_addr_valid(ratio)) + return OPAL_PARAMETER; + + if (psr_get_class(handle) == PSR_CLASS_OCC) + return occ_get_psr(handle, ratio); + + return OPAL_UNSUPPORTED; +}; + +opal_call(OPAL_GET_POWER_SHIFT_RATIO, opal_get_power_shift_ratio, 3); + +static int opal_set_power_shift_ratio(u32 handle, int token, + u32 ratio) +{ + if (psr_get_class(handle) == PSR_CLASS_OCC) + return occ_set_psr(handle, token, ratio); + + return OPAL_UNSUPPORTED; +}; + +opal_call(OPAL_SET_POWER_SHIFT_RATIO, opal_set_power_shift_ratio, 3); |