blob: 9c8affc4f284fb01771d9628331d09ab49b09c42 [file] [log] [blame]
#include "bmc_epoch.hpp"
#include "utils.hpp"
#include <sys/timerfd.h>
#include <unistd.h>
#include <phosphor-logging/elog-errors.hpp>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <xyz/openbmc_project/Common/error.hpp>
// Need to do this since its not exported outside of the kernel.
// Refer : https://gist.github.com/lethean/446cea944b7441228298
#ifndef TFD_TIMER_CANCEL_ON_SET
#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
#endif
// Needed to make sure timerfd does not misfire even though we set CANCEL_ON_SET
#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
namespace phosphor
{
namespace time
{
namespace server = sdbusplus::xyz::openbmc_project::Time::server;
using namespace phosphor::logging;
BmcEpoch::BmcEpoch(sdbusplus::bus::bus& bus, const char* objPath) :
EpochBase(bus, objPath), bus(bus)
{
initialize();
}
void BmcEpoch::initialize()
{
using InternalFailure =
sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
// Subscribe time change event
// Choose the MAX time that is possible to avoid mis fires.
constexpr itimerspec maxTime = {
{0, 0}, // it_interval
{TIME_T_MAX, 0}, // it_value
};
timeFd = timerfd_create(CLOCK_REALTIME, 0);
if (timeFd == -1)
{
log<level::ERR>("Failed to create timerfd", entry("ERRNO=%d", errno),
entry("ERR=%s", strerror(errno)));
elog<InternalFailure>();
}
auto r = timerfd_settime(
timeFd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &maxTime, nullptr);
if (r != 0)
{
log<level::ERR>("Failed to set timerfd", entry("ERRNO=%d", errno),
entry("ERR=%s", strerror(errno)));
elog<InternalFailure>();
}
sd_event_source* es;
r = sd_event_add_io(bus.get_event(), &es, timeFd, EPOLLIN, onTimeChange,
this);
if (r < 0)
{
log<level::ERR>("Failed to add event", entry("ERRNO=%d", -r),
entry("ERR=%s", strerror(-r)));
elog<InternalFailure>();
}
timeChangeEventSource.reset(es);
}
BmcEpoch::~BmcEpoch()
{
close(timeFd);
}
uint64_t BmcEpoch::elapsed() const
{
return getTime().count();
}
uint64_t BmcEpoch::elapsed(uint64_t value)
{
/*
Mode | Set BMC Time
----- | -------------
NTP | Fail to set
MANUAL| OK
*/
auto time = microseconds(value);
setTime(time);
server::EpochTime::elapsed(value);
return value;
}
int BmcEpoch::onTimeChange(sd_event_source* es, int fd, uint32_t /* revents */,
void* userdata)
{
std::array<char, 64> time{};
// We are not interested in the data here.
// So read until there is no new data here in the FD
while (read(fd, time.data(), time.max_size()) > 0)
;
return 0;
}
} // namespace time
} // namespace phosphor