diff options
Diffstat (limited to 'src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H')
| -rw-r--r-- | src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H | 85 |
1 files changed, 84 insertions, 1 deletions
diff --git a/src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H b/src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H index e8b4f0f61..c65ffb637 100644 --- a/src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H +++ b/src/import/generic/memory/lib/utils/power_thermal/gen_throttle.H @@ -5,7 +5,7 @@ /* */ /* OpenPOWER HostBoot Project */ /* */ -/* Contributors Listed Below - COPYRIGHT 2019 */ +/* Contributors Listed Below - COPYRIGHT 2019,2020 */ /* [+] International Business Machines Corp. */ /* */ /* */ @@ -69,6 +69,29 @@ enum throttle_const : size_t }; /// +/// @brief Calculate the N throttle for a given dram data bus utilization value +/// +/// @tparam T1 template parameter, type of input to be processed +/// @tparam T2 template parameter, type of input to be processed +/// @param[in] i_dram_util dram data bus utilization value +/// @param[in] i_throttle_m M throttle value in N/M throttling +/// +/// @return int32_t calculated N throttle value +/// +template<typename T1, typename T2> +inline uint32_t calc_n_from_dram_util(const T1 i_dram_util, const T2 i_throttle_m) +{ + constexpr uint64_t CONVERT_ADDR_UTIL_TO_DATA_UTIL = 4; + + return (static_cast<int>(static_cast<double>(i_dram_util) + * (i_throttle_m) + / (CONVERT_ADDR_UTIL_TO_DATA_UTIL) + / (PERCENT_CONVERSION) + ) + ); +} + +/// /// @brief Calculate N (address operations) allowed within a window of M DRAM clocks /// @param[in] i_databus_util databus utilization percentage (e.g. 5% = 5) /// @param[in] i_num_dram_clocks window of M DRAM clocks @@ -1098,6 +1121,66 @@ fapi_try_exit: /// +/// @brief set the safemode throttle register +/// @tparam MC mss::mc_type +/// @tparam T the fapi2 target type of the target +/// @tparam TT portTraits port traits for the given MC target type +/// @param[in] i_target the port target +/// @return fapi2::FAPI2_RC_SUCCESS if ok +/// @note sets FARB4Q +/// @note used to set throttle window (N throttles / M clocks) +/// +template<mss::mc_type MC = DEFAULT_MC_TYPE, fapi2::TargetType T, typename TT = throttle_traits<MC>> +fapi2::ReturnCode calc_utilization(const fapi2::Target<T>& i_target, + const uint32_t i_input_databus_util, + const uint32_t i_dram_clocks, + const uint16_t i_safemode_throttle_per_port, + const uint32_t i_max_databus_util, + uint32_t& o_util, + bool& o_util_error, + bool& o_safemode) +{ + constexpr uint64_t l_min_util = TT::MIN_UTIL; + + o_util = i_input_databus_util; + o_safemode = false; + + // Use MRW safemode throttle values if input utilization is zero + if (i_input_databus_util == 0) + { + FAPI_TRY(calc_util_from_throttles<MC>(i_safemode_throttle_per_port, + i_dram_clocks, + o_util), + "%s Error calculating utilization from safemode throttle %d and mem clocks %d", + mss::c_str(i_target), + i_safemode_throttle_per_port, + i_dram_clocks); + FAPI_INF("%s Safemode throttles being used since input util is zero: Using N=%d, Utilization %f", + mss::c_str(i_target), + i_safemode_throttle_per_port, + o_util); + o_safemode = true; + } + else if (i_input_databus_util < l_min_util) + { + o_util_error = true; + } + + // Make sure MIN_UTIL <= input_utilization <= max_utilization + o_util = (o_util >= l_min_util) ? std::min(o_util, i_max_databus_util) : l_min_util; + + FAPI_INF("%s MRW dram clock window: %d, databus utilization: %d", + mss::c_str(i_target), + i_dram_clocks, + o_util); + + return fapi2::FAPI2_RC_SUCCESS; + +fapi_try_exit: + return fapi2::current_err; +} + +/// /// @brief Equalize the throttles and estimated power at those throttle levels /// @tparam MC mss::mc_type /// @tparam T the fapi2 MC target type of the target |
