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/* |
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* Copyright (C) 2005-2008 by Pieter Palmers |
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* |
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* This file is part of FFADO |
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* FFADO = Free Firewire (pro-)audio drivers for linux |
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* |
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* FFADO is based upon FreeBoB |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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#include "config.h" |
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#include "CycleTimerHelper.h" |
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#include "ieee1394service.h" |
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#include "libutil/PosixThread.h" |
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#define DLL_PI (3.141592653589793238) |
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#define DLL_SQRT2 (1.414213562373095049) |
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// the high-bandwidth coefficients are used |
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// to speed up inital tracking |
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#define DLL_BANDWIDTH_HIGH (0.1) |
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#define DLL_OMEGA_HIGH (2.0*DLL_PI*DLL_BANDWIDTH_HIGH) |
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#define DLL_COEFF_B_HIGH (DLL_SQRT2 * DLL_OMEGA_HIGH) |
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#define DLL_COEFF_C_HIGH (DLL_OMEGA_HIGH * DLL_OMEGA_HIGH) |
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|
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// the low-bandwidth coefficients are used once we have a |
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// good estimate of the internal parameters |
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#define DLL_BANDWIDTH (0.01) |
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#define DLL_OMEGA (2.0*DLL_PI*DLL_BANDWIDTH) |
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#define DLL_COEFF_B (DLL_SQRT2 * DLL_OMEGA) |
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#define DLL_COEFF_C (DLL_OMEGA * DLL_OMEGA) |
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#define UPDATES_WITH_HIGH_BANDWIDTH 200 |
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/* |
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#define ENTER_CRITICAL_SECTION { \ |
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if (pthread_mutex_trylock(&m_compute_vars_lock) == EBUSY) { \ |
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debugWarning(" (%p) lock clash\n", this); \ |
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ENTER_CRITICAL_SECTION; \ |
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} \ |
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} |
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*/ |
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#define ENTER_CRITICAL_SECTION { \ |
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pthread_mutex_lock(&m_compute_vars_lock); \ |
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} |
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#define EXIT_CRITICAL_SECTION { \ |
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pthread_mutex_unlock(&m_compute_vars_lock); \ |
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} |
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IMPL_DEBUG_MODULE( CycleTimerHelper, CycleTimerHelper, DEBUG_LEVEL_NORMAL ); |
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CycleTimerHelper::CycleTimerHelper(Ieee1394Service &parent, unsigned int update_period_us) |
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: m_Parent ( parent ) |
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, m_ticks_per_update ( ((uint64_t)TICKS_PER_SECOND) * ((uint64_t)update_period_us) / 1000000ULL ) |
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, m_usecs_per_update ( update_period_us ) |
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, m_avg_wakeup_delay ( 0.0 ) |
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, m_dll_e2 ( 0.0 ) |
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, m_current_time_usecs ( 0 ) |
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, m_next_time_usecs ( 0 ) |
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, m_current_time_ticks ( 0 ) |
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, m_next_time_ticks ( 0 ) |
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, m_first_run ( true ) |
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, m_sleep_until ( 0 ) |
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, m_cycle_timer_prev ( 0 ) |
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, m_cycle_timer_ticks_prev ( 0 ) |
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, m_high_bw_updates ( UPDATES_WITH_HIGH_BANDWIDTH ) |
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, m_Thread ( NULL ) |
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, m_realtime ( false ) |
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, m_priority ( 0 ) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Create %p...\n", this); |
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} |
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CycleTimerHelper::CycleTimerHelper(Ieee1394Service &parent, unsigned int update_period_us, bool rt, int prio) |
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: m_Parent ( parent ) |
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, m_ticks_per_update ( ((uint64_t)TICKS_PER_SECOND) * ((uint64_t)update_period_us) / 1000000ULL ) |
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, m_usecs_per_update ( update_period_us ) |
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, m_avg_wakeup_delay ( 0.0 ) |
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, m_dll_e2 ( 0.0 ) |
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, m_current_time_usecs ( 0 ) |
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, m_next_time_usecs ( 0 ) |
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, m_current_time_ticks ( 0 ) |
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, m_next_time_ticks ( 0 ) |
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, m_first_run ( true ) |
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, m_sleep_until ( 0 ) |
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, m_cycle_timer_prev ( 0 ) |
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, m_cycle_timer_ticks_prev ( 0 ) |
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, m_high_bw_updates ( UPDATES_WITH_HIGH_BANDWIDTH ) |
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, m_Thread ( NULL ) |
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, m_realtime ( rt ) |
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, m_priority ( prio ) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Create %p...\n", this); |
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} |
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CycleTimerHelper::~CycleTimerHelper() |
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{ |
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if (m_Thread) { |
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m_Thread->Stop(); |
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delete m_Thread; |
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} |
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} |
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bool |
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CycleTimerHelper::Start() |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Start %p...\n", this); |
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#if IEEE1394SERVICE_USE_CYCLETIMER_DLL |
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m_high_bw_updates = UPDATES_WITH_HIGH_BANDWIDTH; |
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m_Thread = new Util::PosixThread(this, m_realtime, m_priority, |
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PTHREAD_CANCEL_DEFERRED); |
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if(!m_Thread) { |
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debugFatal("No thread\n"); |
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return false; |
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} |
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if (m_Thread->Start() != 0) { |
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debugFatal("Could not start update thread\n"); |
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return false; |
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} |
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#endif |
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return true; |
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} |
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bool |
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CycleTimerHelper::Init() |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Initialize %p...\n", this); |
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pthread_mutex_init(&m_compute_vars_lock, NULL); |
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// initialize the 'prev ctr' values |
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uint64_t local_time; |
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int maxtries2 = 10; |
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do { |
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if(!m_Parent.readCycleTimerReg(&m_cycle_timer_prev, &local_time)) { |
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debugError("Could not read cycle timer register\n"); |
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return false; |
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} |
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if (m_cycle_timer_prev == 0) { |
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debugOutput(DEBUG_LEVEL_VERBOSE, |
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"Bogus CTR: %08X on try %02d\n", |
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m_cycle_timer_prev, maxtries2); |
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} |
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} while (m_cycle_timer_prev == 0 && maxtries2--); |
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m_cycle_timer_ticks_prev = CYCLE_TIMER_TO_TICKS(m_cycle_timer_prev); |
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return true; |
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} |
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bool |
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CycleTimerHelper::setThreadParameters(bool rt, int priority) { |
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debugOutput( DEBUG_LEVEL_VERBOSE, "(%p) switch to: (rt=%d, prio=%d)...\n", this, rt, priority); |
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if (priority > THREAD_MAX_RTPRIO) priority = THREAD_MAX_RTPRIO; // cap the priority |
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m_realtime = rt; |
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m_priority = priority; |
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#if IEEE1394SERVICE_USE_CYCLETIMER_DLL |
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if (m_Thread) { |
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if (m_realtime) { |
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m_Thread->AcquireRealTime(m_priority); |
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} else { |
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m_Thread->DropRealTime(); |
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} |
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} |
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#endif |
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return true; |
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} |
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#if IEEE1394SERVICE_USE_CYCLETIMER_DLL |
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float |
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CycleTimerHelper::getRate() |
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{ |
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float rate = (float)(diffTicks((uint64_t)m_next_time_ticks, (uint64_t)m_current_time_ticks)); |
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rate /= (float)(m_next_time_usecs - m_current_time_usecs); |
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return rate; |
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} |
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float |
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CycleTimerHelper::getNominalRate() |
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{ |
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float rate = ((double)TICKS_PER_SECOND) / 1000000.0; |
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return rate; |
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} |
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bool |
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CycleTimerHelper::Execute() |
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{ |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, "Execute %p...\n", this); |
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if (!m_first_run) { |
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// wait for the next update period |
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ffado_microsecs_t now = m_TimeSource.getCurrentTimeAsUsecs(); |
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int sleep_time = m_sleep_until - now; |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, "(%p) Sleep until %lld/%f (now: %lld, diff=%d) ...\n", |
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this, m_sleep_until, m_next_time_usecs, now, sleep_time); |
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m_TimeSource.SleepUsecAbsolute(m_sleep_until); |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, " (%p) back...\n", this); |
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} |
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uint32_t cycle_timer; |
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uint64_t local_time; |
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int64_t usecs_late; |
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int ntries=2; |
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uint64_t cycle_timer_ticks; |
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double diff_ticks; |
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// if the difference between the predicted value and the |
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// actual value seems to be too large, retry reading the cycle timer |
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// some host controllers return bogus values on some reads |
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// (looks like a non-atomic update of the register) |
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do { |
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if(!readCycleTimerWithRetry(&cycle_timer, &local_time, 10)) { |
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debugError("Could not read cycle timer register\n"); |
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return false; |
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} |
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usecs_late = local_time - m_sleep_until; |
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cycle_timer_ticks = CYCLE_TIMER_TO_TICKS(cycle_timer); |
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diff_ticks = diffTicks(cycle_timer_ticks, (int64_t)m_next_time_ticks); |
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if(diff_ticks < -((double)TICKS_PER_HALFCYCLE)) { |
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debugOutput(DEBUG_LEVEL_VERBOSE, "have to retry, diff = %f\n",diff_ticks); |
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} |
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} while(diff_ticks < -((double)TICKS_PER_HALFCYCLE) && --ntries && !m_first_run); |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, " read : CTR: %11lu, local: %17llu\n", |
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cycle_timer, local_time); |
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if (m_first_run) { |
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m_sleep_until = local_time + m_usecs_per_update; |
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m_dll_e2 = m_ticks_per_update; |
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m_current_time_usecs = local_time; |
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m_next_time_usecs = m_current_time_usecs + m_usecs_per_update; |
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m_current_time_ticks = CYCLE_TIMER_TO_TICKS( cycle_timer ); |
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m_next_time_ticks = addTicks( (uint64_t)m_current_time_ticks, (uint64_t)m_dll_e2); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " First run\n"); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " usecs/update: %lu, ticks/update: %lu, m_dll_e2: %f\n", |
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m_usecs_per_update, m_ticks_per_update, m_dll_e2); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " usecs current: %f, next: %f\n", m_current_time_usecs, m_next_time_usecs); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " ticks current: %f, next: %f\n", m_current_time_ticks, m_next_time_ticks); |
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m_first_run = false; |
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} else { |
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m_sleep_until += m_usecs_per_update; |
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double diff_ticks_corr; |
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// correct for late wakeup |
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int64_t ticks_late = (usecs_late * TICKS_PER_SECOND) / 1000000LL; |
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if (ticks_late > 0) { |
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// if we are usecs_late usecs late |
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// the cycle timer has ticked approx ticks_late ticks too much |
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cycle_timer_ticks = substractTicks(cycle_timer_ticks, ticks_late); |
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diff_ticks_corr = diff_ticks - ticks_late; |
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} else { |
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debugError("Early wakeup, should not happen!\n"); |
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// recover |
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cycle_timer_ticks = addTicks(cycle_timer_ticks, -ticks_late); |
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diff_ticks_corr = diff_ticks + ticks_late; |
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} |
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#ifdef DEBUG |
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if(usecs_late > 200) { |
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debugWarning("Rather late wakeup: %lld usecs\n", usecs_late); |
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} |
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#endif |
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// update the x-axis values |
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m_current_time_ticks = m_next_time_ticks; |
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// decide what coefficients to use |
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double coeff_b, coeff_c; |
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if (m_high_bw_updates > 0) { |
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coeff_b = DLL_COEFF_B_HIGH; |
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coeff_c = DLL_COEFF_C_HIGH; |
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m_high_bw_updates--; |
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if (m_high_bw_updates == 0) { |
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debugOutput(DEBUG_LEVEL_VERBOSE, "Switching to low-bandwidth coefficients\n"); |
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} |
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} else { |
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coeff_b = DLL_COEFF_B; |
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coeff_c = DLL_COEFF_C; |
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} |
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// do the calculation in 'tick space' |
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int64_t tmp = (uint64_t)(coeff_b * diff_ticks_corr); |
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if(m_dll_e2 > 0) { |
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tmp = addTicks(tmp, (uint64_t)m_dll_e2); |
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} else { |
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tmp = substractTicks(tmp, (uint64_t)(-m_dll_e2)); |
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} |
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if(tmp < 0) { |
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debugWarning("negative slope: %lld!\n", tmp); |
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} |
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m_next_time_ticks = addTicks((uint64_t)m_current_time_ticks, tmp); |
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|
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// it should be ok to not do this in tick space since it's value |
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// is approx equal to the rate, being 24.576 ticks/usec |
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m_dll_e2 += coeff_c * diff_ticks_corr; |
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|
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// For jitter graphs |
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// debugOutputShort(DEBUG_LEVEL_NORMAL, "0123456789 %f %f %f %lld %lld %lld\n", |
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// diff_ticks, diff_ticks_corr, m_dll_e2, cycle_timer_ticks, (int64_t)m_next_time_ticks, usecs_late); |
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|
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// update the y-axis values |
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m_current_time_usecs = m_next_time_usecs; |
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m_next_time_usecs += m_usecs_per_update; |
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|
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, " usecs: current: %f next: %f usecs_late=%lld ticks_late=%lld\n", |
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m_current_time_usecs, m_next_time_usecs, usecs_late, ticks_late); |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, " ticks: current: %f next: %f diff=%f\n", |
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m_current_time_ticks, m_next_time_ticks, diff_ticks); |
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debugOutputExtreme( DEBUG_LEVEL_VERY_VERBOSE, " state: local: %11llu, dll_e2: %f, rate: %f\n", |
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local_time, m_dll_e2, getRate()); |
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} |
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|
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// FIXME: priority inversion possible, run this at higher prio than client threads |
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ENTER_CRITICAL_SECTION; |
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m_current_vars.ticks = (uint64_t)(m_current_time_ticks); |
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m_current_vars.usecs = (uint64_t)m_current_time_usecs; |
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m_current_vars.rate = getRate(); |
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EXIT_CRITICAL_SECTION; |
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|
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return true; |
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} |
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|
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uint32_t |
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CycleTimerHelper::getCycleTimerTicks() |
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{ |
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uint64_t now = m_Parent.getCurrentTimeAsUsecs(); |
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return getCycleTimerTicks(now); |
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} |
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|
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uint32_t |
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CycleTimerHelper::getCycleTimerTicks(uint64_t now) |
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{ |
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uint32_t retval; |
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struct compute_vars my_vars; |
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|
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// reduce lock contention |
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ENTER_CRITICAL_SECTION; |
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my_vars = m_current_vars; |
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EXIT_CRITICAL_SECTION; |
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|
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int64_t time_diff = now - my_vars.usecs; |
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double y_step_in_ticks = ((double)time_diff) * my_vars.rate; |
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int64_t y_step_in_ticks_int = (int64_t)y_step_in_ticks; |
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uint64_t offset_in_ticks_int = my_vars.ticks; |
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|
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if (y_step_in_ticks_int > 0) { |
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retval = addTicks(offset_in_ticks_int, y_step_in_ticks_int); |
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debugOutputExtreme(DEBUG_LEVEL_VERY_VERBOSE, "y_step_in_ticks_int > 0: %lld, time_diff: %f, rate: %f, retval: %lu\n", |
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y_step_in_ticks_int, time_diff, my_vars.rate, retval); |
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} else { |
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retval = substractTicks(offset_in_ticks_int, -y_step_in_ticks_int); |
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|
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// this can happen if the update thread was woken up earlier than it should have been |
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debugOutputExtreme(DEBUG_LEVEL_VERY_VERBOSE, "y_step_in_ticks_int <= 0: %lld, time_diff: %f, rate: %f, retval: %lu\n", |
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y_step_in_ticks_int, time_diff, my_vars.rate, retval); |
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} |
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|
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return retval; |
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} |
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|
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uint32_t |
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CycleTimerHelper::getCycleTimer() |
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{ |
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uint64_t now = m_Parent.getCurrentTimeAsUsecs(); |
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return getCycleTimer(now); |
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} |
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|
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uint32_t |
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382 |
CycleTimerHelper::getCycleTimer(uint64_t now) |
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383 |
{ |
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384 |
uint32_t ticks = getCycleTimerTicks(now); |
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385 |
uint32_t result = TICKS_TO_CYCLE_TIMER(ticks); |
---|
386 |
#ifdef DEBUG |
---|
387 |
if(CYCLE_TIMER_TO_TICKS(result) != ticks) { |
---|
388 |
debugWarning("Bad ctr conversion"); |
---|
389 |
} |
---|
390 |
#endif |
---|
391 |
return result; |
---|
392 |
} |
---|
393 |
|
---|
394 |
#else |
---|
395 |
|
---|
396 |
float |
---|
397 |
CycleTimerHelper::getRate() |
---|
398 |
{ |
---|
399 |
return getNominalRate(); |
---|
400 |
} |
---|
401 |
|
---|
402 |
float |
---|
403 |
CycleTimerHelper::getNominalRate() |
---|
404 |
{ |
---|
405 |
float rate = ((double)TICKS_PER_SECOND) / 1000000.0; |
---|
406 |
return rate; |
---|
407 |
} |
---|
408 |
|
---|
409 |
bool |
---|
410 |
CycleTimerHelper::Execute() |
---|
411 |
{ |
---|
412 |
usleep(1000*1000); |
---|
413 |
return true; |
---|
414 |
} |
---|
415 |
|
---|
416 |
uint32_t |
---|
417 |
CycleTimerHelper::getCycleTimerTicks() |
---|
418 |
{ |
---|
419 |
return CYCLE_TIMER_TO_TICKS(getCycleTimer()); |
---|
420 |
} |
---|
421 |
|
---|
422 |
uint32_t |
---|
423 |
CycleTimerHelper::getCycleTimerTicks(uint64_t now) |
---|
424 |
{ |
---|
425 |
debugWarning("not implemented!\n"); |
---|
426 |
return getCycleTimerTicks(); |
---|
427 |
} |
---|
428 |
|
---|
429 |
uint32_t |
---|
430 |
CycleTimerHelper::getCycleTimer() |
---|
431 |
{ |
---|
432 |
uint32_t cycle_timer; |
---|
433 |
uint64_t local_time; |
---|
434 |
readCycleTimerWithRetry(&cycle_timer, &local_time, 10); |
---|
435 |
return cycle_timer; |
---|
436 |
} |
---|
437 |
|
---|
438 |
uint32_t |
---|
439 |
CycleTimerHelper::getCycleTimer(uint64_t now) |
---|
440 |
{ |
---|
441 |
debugWarning("not implemented!\n"); |
---|
442 |
return getCycleTimer(); |
---|
443 |
} |
---|
444 |
|
---|
445 |
#endif |
---|
446 |
|
---|
447 |
bool |
---|
448 |
CycleTimerHelper::readCycleTimerWithRetry(uint32_t *cycle_timer, uint64_t *local_time, int ntries) |
---|
449 |
{ |
---|
450 |
bool good=false; |
---|
451 |
int maxtries = ntries; |
---|
452 |
|
---|
453 |
do { |
---|
454 |
// the ctr read can return 0 sometimes. if that happens, reread the ctr. |
---|
455 |
int maxtries2=ntries; |
---|
456 |
do { |
---|
457 |
if(!m_Parent.readCycleTimerReg(cycle_timer, local_time)) { |
---|
458 |
debugError("Could not read cycle timer register\n"); |
---|
459 |
return false; |
---|
460 |
} |
---|
461 |
if (*cycle_timer == 0) { |
---|
462 |
debugOutput(DEBUG_LEVEL_VERBOSE, |
---|
463 |
"Bogus CTR: %08X on try %02d\n", |
---|
464 |
*cycle_timer, maxtries2); |
---|
465 |
} |
---|
466 |
} while (*cycle_timer == 0 && maxtries2--); |
---|
467 |
|
---|
468 |
// catch bogus ctr reads (can happen) |
---|
469 |
uint64_t cycle_timer_ticks = CYCLE_TIMER_TO_TICKS(*cycle_timer); |
---|
470 |
|
---|
471 |
if (diffTicks(cycle_timer_ticks, m_cycle_timer_ticks_prev) < 0) { |
---|
472 |
debugOutput( DEBUG_LEVEL_VERBOSE, |
---|
473 |
"non-monotonic CTR (try %02d): %llu -> %llu\n", |
---|
474 |
maxtries, m_cycle_timer_ticks_prev, cycle_timer_ticks); |
---|
475 |
debugOutput( DEBUG_LEVEL_VERBOSE, |
---|
476 |
" : %08X -> %08X\n", |
---|
477 |
m_cycle_timer_prev, *cycle_timer); |
---|
478 |
debugOutput( DEBUG_LEVEL_VERBOSE, |
---|
479 |
" current: %011llu (%03us %04ucy %04uticks)\n", |
---|
480 |
cycle_timer_ticks, |
---|
481 |
(unsigned int)TICKS_TO_SECS( cycle_timer_ticks ), |
---|
482 |
(unsigned int)TICKS_TO_CYCLES( cycle_timer_ticks ), |
---|
483 |
(unsigned int)TICKS_TO_OFFSET( cycle_timer_ticks ) ); |
---|
484 |
debugOutput( DEBUG_LEVEL_VERBOSE, |
---|
485 |
" prev : %011llu (%03us %04ucy %04uticks)\n", |
---|
486 |
m_cycle_timer_ticks_prev, |
---|
487 |
(unsigned int)TICKS_TO_SECS( m_cycle_timer_ticks_prev ), |
---|
488 |
(unsigned int)TICKS_TO_CYCLES( m_cycle_timer_ticks_prev ), |
---|
489 |
(unsigned int)TICKS_TO_OFFSET( m_cycle_timer_ticks_prev ) ); |
---|
490 |
} else { |
---|
491 |
good = true; |
---|
492 |
m_cycle_timer_prev = *cycle_timer; |
---|
493 |
m_cycle_timer_ticks_prev = cycle_timer_ticks; |
---|
494 |
} |
---|
495 |
} while (!good && maxtries--); |
---|
496 |
return true; |
---|
497 |
} |
---|
498 |
|
---|
499 |
void |
---|
500 |
CycleTimerHelper::setVerboseLevel(int l) |
---|
501 |
{ |
---|
502 |
setDebugLevel(l); |
---|
503 |
} |
---|