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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/import/chips/p9/procedures/hwp/memory/lib/workarounds/freq_workarounds.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2018,2019 */
/* [+] International Business Machines 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. */
/* */
/* IBM_PROLOG_END_TAG */
///
/// @file workarounds/freq_workarounds.C
/// @brief Frequency related workarounds
///
// *HWP HWP Owner: Louis Stermole <stermole@us.ibm.com>
// *HWP HWP Backup: Stephen Glancy <sglancy@us.ibm.com>
// *HWP Team: Memory
// *HWP Level: 3
// *HWP Consumed by: FSP:HB
#include <fapi2.H>
#include <mss.H>
#include <lib/workarounds/freq_workarounds.H>
#include <generic/memory/lib/utils/assert_noexit.H>
namespace mss
{
namespace workarounds
{
///
/// @brief Ensures the ratio between DIMM and NEST frequencies is within allowable limit
/// @param[in] i_target - the MCBIST target to check
/// @param[in] i_dimm_speed - dimm speed in MT/s
/// @param[in] i_nest_freq - nest freq in MHz
/// @return FAPI2_RC_SUCCESS iff ok
///
fapi2::ReturnCode check_dimm_nest_freq_ratio( const fapi2::Target<fapi2::TARGET_TYPE_MCBIST>& i_target,
const uint64_t i_dimm_speed,
const uint32_t i_nest_freq )
{
constexpr double MAX_MEM_NEST_FREQ_RATIO = 1.5;
double l_ratio = 0;
FAPI_INF("%s Checking the MEM to NEST frequency ratio versus the allowed limit", mss::c_str(i_target));
// Protect against nest_freq == 0 (divide by zero)
// This should never happen, so do a code callout
FAPI_ASSERT((i_nest_freq != 0) && (i_dimm_speed != 0),
fapi2::MSS_FREQ_OR_NEST_FREQ_IS_ZERO()
.set_MSS_FREQ(i_dimm_speed)
.set_NEST_FREQ(i_nest_freq),
"%s saw a zero memory or nest frequency when checking mem to nest freq ratio: mss: %d, nest: %d",
mss::c_str(i_target),
i_dimm_speed,
i_nest_freq);
// Check limit
l_ratio = static_cast<double>(i_dimm_speed) / static_cast<double>(i_nest_freq);
FAPI_INF("l_ratio = %f, max_ratio = %f", l_ratio, MAX_MEM_NEST_FREQ_RATIO);
if (l_ratio > MAX_MEM_NEST_FREQ_RATIO)
{
// Deconfigure MCSes
for ( const auto& l_mcs : mss::find_targets<fapi2::TARGET_TYPE_MCS>(i_target) )
{
MSS_ASSERT_NOEXIT(false,
fapi2::MSS_FREQ_TO_NEST_FREQ_RATIO_TOO_LARGE()
.set_MSS_FREQ(i_dimm_speed)
.set_NEST_FREQ(i_nest_freq)
.set_MCS_TARGET(l_mcs),
"Deconfiguring %s due to the memory to nest frequency ratio being too large: mss: %d, nest: %d, ratio: %f",
mss::c_str(l_mcs),
i_dimm_speed,
i_nest_freq,
l_ratio);
}
}
fapi_try_exit:
return fapi2::current_err;
}
} // namespace workarounds
} // namespace mss
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