blob: 2555d95aed94d9a14be02657683af9a55703fc66 [file] [log] [blame]
#include <fmt/core.h>
#include <phosphor-logging/log.hpp>
#include <powercap.hpp>
#include <cassert>
#include <regex>
namespace open_power
{
namespace occ
{
namespace powercap
{
constexpr auto PCAP_PATH = "/xyz/openbmc_project/control/host0/power_cap";
constexpr auto PCAP_INTERFACE = "xyz.openbmc_project.Control.Power.Cap";
constexpr auto POWER_CAP_PROP = "PowerCap";
constexpr auto POWER_CAP_ENABLE_PROP = "PowerCapEnable";
using namespace phosphor::logging;
namespace fs = std::filesystem;
uint32_t PowerCap::getOccInput(uint32_t pcap, bool pcapEnabled)
{
if (!pcapEnabled)
{
// Pcap disabled, return 0 to indicate disabled
return 0;
}
// If pcap is not disabled then just return the pcap with the derating
// factor applied.
return ((static_cast<uint64_t>(pcap) * PS_DERATING_FACTOR) / 100);
}
uint32_t PowerCap::getPcap()
{
utils::PropertyValue pcap{};
try
{
pcap = utils::getProperty(PCAP_PATH, PCAP_INTERFACE, POWER_CAP_PROP);
return std::get<uint32_t>(pcap);
}
catch (const sdbusplus::exception::exception& e)
{
log<level::ERR>("Failed to get PowerCap property",
entry("ERROR=%s", e.what()),
entry("PATH=%s", PCAP_PATH));
return 0;
}
}
bool PowerCap::getPcapEnabled()
{
utils::PropertyValue pcapEnabled{};
try
{
pcapEnabled = utils::getProperty(PCAP_PATH, PCAP_INTERFACE,
POWER_CAP_ENABLE_PROP);
return std::get<bool>(pcapEnabled);
}
catch (const sdbusplus::exception::exception& e)
{
log<level::ERR>("Failed to get PowerCapEnable property",
entry("ERROR=%s", e.what()),
entry("PATH=%s", PCAP_PATH));
return false;
}
}
std::string PowerCap::getPcapFilename(const fs::path& path)
{
std::regex expr{"power\\d+_cap_user$"};
for (auto& file : fs::directory_iterator(path))
{
if (std::regex_search(file.path().string(), expr))
{
return file.path().filename();
}
}
return std::string{};
}
void PowerCap::writeOcc(uint32_t pcapValue)
{
// Create path out to master occ hwmon entry
std::unique_ptr<fs::path> fileName =
std::make_unique<fs::path>(OCC_HWMON_PATH);
*fileName /= occMasterName;
*fileName /= "hwmon";
// Need to get the hwmonXX directory name, there better only be 1 dir
assert(std::distance(fs::directory_iterator(*fileName),
fs::directory_iterator{}) == 1);
// Now set our path to this full path, including this hwmonXX directory
fileName = std::make_unique<fs::path>(*fs::directory_iterator(*fileName));
// Append on the hwmon string where we write the user power cap
auto baseName = getPcapFilename(*fileName);
if (baseName.empty())
{
log<level::ERR>(
fmt::format("Could not find a power cap file to write to: {})",
fileName->c_str())
.c_str());
return;
}
*fileName /= baseName;
uint64_t microWatts = pcapValue * 1000000ull;
auto pcapString{std::to_string(microWatts)};
log<level::INFO>("Writing pcap value to hwmon",
entry("PCAP_PATH=%s", fileName->c_str()),
entry("PCAP_VALUE=%s", pcapString.c_str()));
// Open the hwmon file and write the power cap
std::ofstream file(*fileName, std::ios::out);
file << pcapString;
file.close();
return;
}
void PowerCap::pcapChanged(sdbusplus::message::message& msg)
{
if (!occStatus.occActive())
{
// Nothing to do
return;
}
uint32_t pcap = 0;
bool pcapEnabled = false;
std::string msgSensor;
std::map<std::string, std::variant<uint32_t, bool>> msgData;
msg.read(msgSensor, msgData);
// Retrieve which property changed via the msg and read the other one
auto valPropMap = msgData.find(POWER_CAP_PROP);
if (valPropMap != msgData.end())
{
pcap = std::get<uint32_t>(valPropMap->second);
pcapEnabled = getPcapEnabled();
}
else
{
valPropMap = msgData.find(POWER_CAP_ENABLE_PROP);
if (valPropMap != msgData.end())
{
pcapEnabled = std::get<bool>(valPropMap->second);
pcap = getPcap();
}
else
{
log<level::INFO>("Unknown power cap property changed");
return;
}
}
log<level::INFO>(
fmt::format("Power Cap Property Change (cap={}W (input), enabled={})",
pcap, pcapEnabled ? 'y' : 'n')
.c_str());
// Determine desired action to write to occ
auto occInput = getOccInput(pcap, pcapEnabled);
// Write action to occ
writeOcc(occInput);
return;
}
} // namespace powercap
} // namespace occ
} // namespace open_power