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/**
* Copyright © 2019 IBM Corporation
*
* 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 "host_notifier.hpp"
#include <phosphor-logging/log.hpp>
namespace openpower::pels
{
const auto subscriptionName = "PELHostNotifier";
const size_t maxRetryAttempts = 15;
using namespace phosphor::logging;
HostNotifier::HostNotifier(Repository& repo, DataInterfaceBase& dataIface,
std::unique_ptr<HostInterface> hostIface) :
_repo(repo),
_dataIface(dataIface), _hostIface(std::move(hostIface)),
_retryTimer(_hostIface->getEvent(),
std::bind(std::mem_fn(&HostNotifier::retryTimerExpired), this))
{
// Subscribe to be told about new PELs.
_repo.subscribeToAdds(subscriptionName,
std::bind(std::mem_fn(&HostNotifier::newLogCallback),
this, std::placeholders::_1));
// Add any existing PELs to the queue to send them if necessary.
_repo.for_each(std::bind(std::mem_fn(&HostNotifier::addPELToQueue), this,
std::placeholders::_1));
// Subscribe to be told about host state changes.
_dataIface.subscribeToHostStateChange(
subscriptionName,
std::bind(std::mem_fun(&HostNotifier::hostStateChange), this,
std::placeholders::_1));
// Set the function to call when the async reponse is received.
_hostIface->setResponseFunction(
std::bind(std::mem_fn(&HostNotifier::commandResponse), this,
std::placeholders::_1));
// Start sending logs if the host is running
if (!_pelQueue.empty() && _dataIface.isHostUp())
{
doNewLogNotify();
}
}
HostNotifier::~HostNotifier()
{
_repo.unsubscribeFromAdds(subscriptionName);
_dataIface.unsubscribeFromHostStateChange(subscriptionName);
}
bool HostNotifier::addPELToQueue(const PEL& pel)
{
if (enqueueRequired(pel.id()))
{
_pelQueue.push_back(pel.id());
}
// Return false so that Repo::for_each keeps going.
return false;
}
bool HostNotifier::enqueueRequired(uint32_t id) const
{
bool required = true;
Repository::LogID i{Repository::LogID::Pel{id}};
if (auto attributes = _repo.getPELAttributes(i); attributes)
{
auto a = attributes.value().get();
if ((a.hostState == TransmissionState::acked) ||
(a.hostState == TransmissionState::badPEL))
{
required = false;
}
else if (a.actionFlags.test(hiddenFlagBit) &&
(a.hmcState == TransmissionState::acked))
{
required = false;
}
else if (a.actionFlags.test(dontReportToHostFlagBit))
{
required = false;
}
}
else
{
using namespace phosphor::logging;
log<level::ERR>("Host Enqueue: Unable to find PEL ID in repository",
entry("PEL_ID=0x%X", id));
required = false;
}
return required;
}
bool HostNotifier::notifyRequired(uint32_t id) const
{
bool notify = true;
Repository::LogID i{Repository::LogID::Pel{id}};
if (auto attributes = _repo.getPELAttributes(i); attributes)
{
// If already acked by the host, don't send again.
// (A safety check as it shouldn't get to this point.)
auto a = attributes.value().get();
if (a.hostState == TransmissionState::acked)
{
notify = false;
}
else if (a.actionFlags.test(hiddenFlagBit))
{
// If hidden and acked (or will be) acked by the HMC,
// also don't send it. (HMC management can come and
// go at any time)
if ((a.hmcState == TransmissionState::acked) ||
_dataIface.isHMCManaged())
{
notify = false;
}
}
}
else
{
// Must have been deleted since put on the queue.
notify = false;
}
return notify;
}
void HostNotifier::newLogCallback(const PEL& pel)
{
if (!enqueueRequired(pel.id()))
{
return;
}
_pelQueue.push_back(pel.id());
if (!_dataIface.isHostUp())
{
return;
}
// Dispatch a command now if there isn't currently a command
// in progress and this is the first log in the queue or it
// previously gave up from a hard failure.
auto inProgress = (_inProgressPEL != 0) || _hostIface->cmdInProgress() ||
_retryTimer.isEnabled();
auto firstPEL = _pelQueue.size() == 1;
auto gaveUp = _retryCount >= maxRetryAttempts;
if (!inProgress && (firstPEL || gaveUp))
{
_retryCount = 0;
// Send a log, but from the event loop, not from here.
scheduleDispatch();
}
}
void HostNotifier::scheduleDispatch()
{
_dispatcher = std::make_unique<sdeventplus::source::Defer>(
_hostIface->getEvent(), std::bind(std::mem_fn(&HostNotifier::dispatch),
this, std::placeholders::_1));
}
void HostNotifier::dispatch(sdeventplus::source::EventBase& source)
{
_dispatcher.reset();
doNewLogNotify();
}
void HostNotifier::doNewLogNotify()
{
if (!_dataIface.isHostUp() || _retryTimer.isEnabled())
{
return;
}
if (_retryCount >= maxRetryAttempts)
{
// Give up until a new log comes in.
if (_retryCount == maxRetryAttempts)
{
// If this were to really happen, the PLDM interface
// would be down and isolating that shouldn't left to
// a logging daemon, so just trace. Also, this will start
// trying again when the next new log comes in.
log<level::ERR>(
"PEL Host notifier hit max retry attempts. Giving up for now.",
entry("PEL_ID=0x%X", _pelQueue.front()));
}
return;
}
bool doNotify = false;
uint32_t id = 0;
// Find the PEL to send
while (!doNotify && !_pelQueue.empty())
{
id = _pelQueue.front();
_pelQueue.pop_front();
if (notifyRequired(id))
{
doNotify = true;
}
}
if (doNotify)
{
// Get the size using the repo attributes
Repository::LogID i{Repository::LogID::Pel{id}};
if (auto attributes = _repo.getPELAttributes(i); attributes)
{
auto size = static_cast<size_t>(
std::filesystem::file_size((*attributes).get().path));
auto rc = _hostIface->sendNewLogCmd(id, size);
if (rc == CmdStatus::success)
{
_inProgressPEL = id;
}
else
{
// It failed. Retry
log<level::ERR>("PLDM send failed", entry("PEL_ID=0x%X", id));
_pelQueue.push_front(id);
_inProgressPEL = 0;
_retryTimer.restartOnce(_hostIface->getSendRetryDelay());
}
}
else
{
log<level::ERR>("PEL ID not in repository. Cannot notify host",
entry("PEL_ID=0x%X", id));
}
}
}
void HostNotifier::hostStateChange(bool hostUp)
{
_retryCount = 0;
if (hostUp && !_pelQueue.empty())
{
doNewLogNotify();
}
else if (!hostUp)
{
stopCommand();
// Reset the state on any PELs that were sent but not acked back
// to new so they'll get sent again.
for (auto id : _sentPELs)
{
_pelQueue.push_back(id);
_repo.setPELHostTransState(id, TransmissionState::newPEL);
}
_sentPELs.clear();
}
}
void HostNotifier::commandResponse(ResponseStatus status)
{
auto id = _inProgressPEL;
_inProgressPEL = 0;
if (status == ResponseStatus::success)
{
_retryCount = 0;
_sentPELs.push_back(id);
_repo.setPELHostTransState(id, TransmissionState::sent);
if (!_pelQueue.empty())
{
doNewLogNotify();
}
}
else
{
log<level::ERR>("PLDM command response failure",
entry("PEL_ID=0x%X", id));
// Retry
_pelQueue.push_front(id);
_retryTimer.restartOnce(_hostIface->getReceiveRetryDelay());
}
}
void HostNotifier::retryTimerExpired()
{
if (_dataIface.isHostUp())
{
log<level::INFO>("Attempting command retry",
entry("PEL_ID=0x%X", _pelQueue.front()));
_retryCount++;
doNewLogNotify();
}
}
void HostNotifier::stopCommand()
{
_retryCount = 0;
if (_inProgressPEL != 0)
{
_pelQueue.push_front(_inProgressPEL);
_inProgressPEL = 0;
}
if (_retryTimer.isEnabled())
{
_retryTimer.setEnabled(false);
}
if (_hostIface->cmdInProgress())
{
_hostIface->cancelCmd();
}
}
void HostNotifier::ackPEL(uint32_t id)
{
_repo.setPELHostTransState(id, TransmissionState::acked);
// No longer just 'sent', so remove it from the sent list.
auto sent = std::find(_sentPELs.begin(), _sentPELs.end(), id);
if (sent != _sentPELs.end())
{
_sentPELs.erase(sent);
}
}
} // namespace openpower::pels