powercap.cpp - openbmc/openpower-occ-control - Gitiles

 #include "occ_status.hpp"

 #include <fmt/core.h>

 #include <phosphor-logging/log.hpp>
 #include <powercap.hpp>

 #include <cassert>
 #include <filesystem>

 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";
 constexpr auto POWER_CAP_HARD_MIN = "MinPowerCapValue";
 constexpr auto POWER_CAP_MAX = "MaxPowerCapValue";

 using namespace phosphor::logging;
 namespace fs = std::filesystem;

 void PowerCap::updatePcapBounds()
 {
     // Build the hwmon string to write the power cap bounds
     fs::path minName = getPcapFilename(std::regex{"power\\d+_cap_min$"});
     fs::path maxName = getPcapFilename(std::regex{"power\\d+_cap_max$"});

     // Read the power cap bounds from sysfs files
     uint64_t cap;
     uint32_t capHardMin = 0, capMax = INT_MAX;
     std::ifstream minFile(minName, std::ios::in);
     if (minFile)
     {
         minFile >> cap;
         minFile.close();
         // Convert to Input Power in Watts (round up)
         capHardMin = ((cap / (PS_DERATING_FACTOR / 100.0) / 1000000) + 0.9);
     }
     else
     {
         log<level::ERR>(
             fmt::format(
                 "updatePcapBounds: unable to find cap_min file: {} (errno={})",
                 pcapBasePathname.c_str(), errno)
                 .c_str());
     }
     std::ifstream maxFile(maxName, std::ios::in);
     if (maxFile)
     {
         maxFile >> cap;
         maxFile.close();
         // Convert to Input Power in Watts (truncate remainder)
         capMax = cap / (PS_DERATING_FACTOR / 100.0) / 1000000;
     }
     else
     {
         log<level::ERR>(
             fmt::format(
                 "updatePcapBounds: unable to find cap_max file: {} (errno={})",
                 pcapBasePathname.c_str(), errno)
                 .c_str());
     }

     // Save the bounds to dbus
     updateDbusPcap(capHardMin, capMax);

     // Validate dbus and hwmon user caps match
     const uint32_t dbusUserCap = getPcap();
     const uint32_t hwmonUserCap = readUserCapHwmon();
     if ((hwmonUserCap != 0) && (dbusUserCap != hwmonUserCap))
     {
         // User power cap is enabled, but does not match dbus
         log<level::ERR>(
             fmt::format(
                 "updatePcapBounds: user powercap mismatch (hwmon:{}W, bdus:{}W) - using dbus",
                 hwmonUserCap, dbusUserCap)
                 .c_str());
         writeOcc(dbusUserCap);
     }
 }

 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;
     }
 }

 fs::path PowerCap::getPcapFilename(const std::regex& expr)
 {
     if (pcapBasePathname.empty())
     {
         pcapBasePathname = occStatus.getHwmonPath();
     }

     if (fs::exists(pcapBasePathname))
     {
         // Search for pcap file based on the supplied expr
         for (auto& file : fs::directory_iterator(pcapBasePathname))
         {
             if (std::regex_search(file.path().string(), expr))
             {
                 // Found match
                 return file;
             }
         }
     }
     else
     {
         log<level::ERR>(fmt::format("Power Cap base filename not found: {}",
                                     pcapBasePathname.c_str())
                             .c_str());
     }

     // return empty path
     return fs::path{};
 }

 // Write the user power cap to sysfs.
 // This will trigger the driver to send the cap to the OCC
 void PowerCap::writeOcc(uint32_t pcapValue)
 {
     // Build the hwmon string to write the user power cap
     fs::path fileName = getPcapFilename(std::regex{"power\\d+_cap_user$"});
     if (fileName.empty())
     {
         log<level::ERR>(
             fmt::format("Could not find a power cap file to write to: {})",
                         pcapBasePathname.c_str())
                 .c_str());
         return;
     }

     uint64_t microWatts = pcapValue * 1000000ull;

     auto pcapString{std::to_string(microWatts)};

     // Open the hwmon file and write the power cap
     std::ofstream file(fileName, std::ios::out);
     if (file)
     {
         log<level::INFO>(fmt::format("Writing {}uW to {}", pcapString.c_str(),
                                      fileName.c_str())
                              .c_str());
         file << pcapString;
         file.close();
     }
     else
     {
         log<level::ERR>(fmt::format("Failed writing {}uW to {} (errno={})",
                                     microWatts, fileName.c_str(), errno)
                             .c_str());
     }

     return;
 }

 // Read the current user power cap from sysfs.
 uint32_t PowerCap::readUserCapHwmon()
 {
     uint32_t userCap = 0;

     // Get the sysfs filename for the user power cap
     fs::path userCapName = getPcapFilename(std::regex{"power\\d+_cap_user$"});
     if (userCapName.empty())
     {
         log<level::ERR>(
             fmt::format(
                 "readUserCapHwmon: Could not find a power cap file to read: {})",
                 pcapBasePathname.c_str())
                 .c_str());
         return 0;
     }

     // Open the sysfs file and read the power cap
     std::ifstream file(userCapName, std::ios::in);
     if (file)
     {
         uint64_t cap;
         file >> cap;
         file.close();
         // Convert to Watts
         userCap = cap / 1000000;
     }
     else
     {
         log<level::ERR>(
             fmt::format("readUserCapHwmon: Failed reading {} (errno={})",
                         userCapName.c_str(), errno)
                 .c_str());
     }

     return userCap;
 }

 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);

     bool changeFound = false;
     for (const auto& [prop, value] : msgData)
     {
         if (prop == POWER_CAP_PROP)
         {
             pcap = std::get<uint32_t>(value);
             pcapEnabled = getPcapEnabled();
             changeFound = true;
         }
         else if (prop == POWER_CAP_ENABLE_PROP)
         {
             pcapEnabled = std::get<bool>(value);
             pcap = getPcap();
             changeFound = true;
         }
         else
         {
             // Ignore other properties
             log<level::DEBUG>(
                 fmt::format(
                     "pcapChanged: Unknown power cap property changed {} to {}",
                     prop.c_str(), std::get<uint32_t>(value))
                     .c_str());
         }
     }

     if (changeFound)
     {
         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;
 }

 // Update the Power Cap bounds on DBus
 bool PowerCap::updateDbusPcap(uint32_t hardMin, uint32_t max)
 {
     bool complete = true;

     try
     {
         utils::setProperty(PCAP_PATH, PCAP_INTERFACE, POWER_CAP_HARD_MIN,
                            hardMin);
     }
     catch (const sdbusplus::exception::exception& e)
     {
         log<level::ERR>(
             fmt::format(
                 "updateDbusPcap: Failed to set HARD PCAP to {}W due to {}",
                 hardMin, e.what())
                 .c_str());
         complete = false;
     }

     try
     {
         utils::setProperty(PCAP_PATH, PCAP_INTERFACE, POWER_CAP_MAX, max);
     }
     catch (const sdbusplus::exception::exception& e)
     {
         log<level::ERR>(
             fmt::format(
                 "updateDbusPcap: Failed to set MAX PCAP to {}W due to {}", max,
                 e.what())
                 .c_str());
         complete = false;
     }

     return complete;
 }
 } // namespace powercap

 } // namespace occ

 } // namespace open_power
	#include "occ_status.hpp"

	#include <fmt/core.h>

	#include <phosphor-logging/log.hpp>
	#include <powercap.hpp>

	#include <cassert>
	#include <filesystem>

	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";
	constexpr auto POWER_CAP_HARD_MIN = "MinPowerCapValue";
	constexpr auto POWER_CAP_MAX = "MaxPowerCapValue";

	using namespace phosphor::logging;
	namespace fs = std::filesystem;

	void PowerCap::updatePcapBounds()
	{
	// Build the hwmon string to write the power cap bounds
	fs::path minName = getPcapFilename(std::regex{"power\\d+_cap_min$"});
	fs::path maxName = getPcapFilename(std::regex{"power\\d+_cap_max$"});

	// Read the power cap bounds from sysfs files
	uint64_t cap;
	uint32_t capHardMin = 0, capMax = INT_MAX;
	std::ifstream minFile(minName, std::ios::in);
	if (minFile)
	{
	minFile >> cap;
	minFile.close();
	// Convert to Input Power in Watts (round up)
	capHardMin = ((cap / (PS_DERATING_FACTOR / 100.0) / 1000000) + 0.9);
	}
	else
	{
	log<level::ERR>(
	fmt::format(
	"updatePcapBounds: unable to find cap_min file: {} (errno={})",
	pcapBasePathname.c_str(), errno)
	.c_str());
	}
	std::ifstream maxFile(maxName, std::ios::in);
	if (maxFile)
	{
	maxFile >> cap;
	maxFile.close();
	// Convert to Input Power in Watts (truncate remainder)
	capMax = cap / (PS_DERATING_FACTOR / 100.0) / 1000000;
	}
	else
	{
	log<level::ERR>(
	fmt::format(
	"updatePcapBounds: unable to find cap_max file: {} (errno={})",
	pcapBasePathname.c_str(), errno)
	.c_str());
	}

	// Save the bounds to dbus
	updateDbusPcap(capHardMin, capMax);

	// Validate dbus and hwmon user caps match
	const uint32_t dbusUserCap = getPcap();
	const uint32_t hwmonUserCap = readUserCapHwmon();
	if ((hwmonUserCap != 0) && (dbusUserCap != hwmonUserCap))
	{
	// User power cap is enabled, but does not match dbus
	log<level::ERR>(
	fmt::format(
	"updatePcapBounds: user powercap mismatch (hwmon:{}W, bdus:{}W) - using dbus",
	hwmonUserCap, dbusUserCap)
	.c_str());
	writeOcc(dbusUserCap);
	}
	}

	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;
	}
	}

	fs::path PowerCap::getPcapFilename(const std::regex& expr)
	{
	if (pcapBasePathname.empty())
	{
	pcapBasePathname = occStatus.getHwmonPath();
	}

	if (fs::exists(pcapBasePathname))
	{
	// Search for pcap file based on the supplied expr
	for (auto& file : fs::directory_iterator(pcapBasePathname))
	{
	if (std::regex_search(file.path().string(), expr))
	{
	// Found match
	return file;
	}
	}
	}
	else
	{
	log<level::ERR>(fmt::format("Power Cap base filename not found: {}",
	pcapBasePathname.c_str())
	.c_str());
	}

	// return empty path
	return fs::path{};
	}

	// Write the user power cap to sysfs.
	// This will trigger the driver to send the cap to the OCC
	void PowerCap::writeOcc(uint32_t pcapValue)
	{
	// Build the hwmon string to write the user power cap
	fs::path fileName = getPcapFilename(std::regex{"power\\d+_cap_user$"});
	if (fileName.empty())
	{
	log<level::ERR>(
	fmt::format("Could not find a power cap file to write to: {})",
	pcapBasePathname.c_str())
	.c_str());
	return;
	}

	uint64_t microWatts = pcapValue * 1000000ull;

	auto pcapString{std::to_string(microWatts)};

	// Open the hwmon file and write the power cap
	std::ofstream file(fileName, std::ios::out);
	if (file)
	{
	log<level::INFO>(fmt::format("Writing {}uW to {}", pcapString.c_str(),
	fileName.c_str())
	.c_str());
	file << pcapString;
	file.close();
	}
	else
	{
	log<level::ERR>(fmt::format("Failed writing {}uW to {} (errno={})",
	microWatts, fileName.c_str(), errno)
	.c_str());
	}

	return;
	}

	// Read the current user power cap from sysfs.
	uint32_t PowerCap::readUserCapHwmon()
	{
	uint32_t userCap = 0;

	// Get the sysfs filename for the user power cap
	fs::path userCapName = getPcapFilename(std::regex{"power\\d+_cap_user$"});
	if (userCapName.empty())
	{
	log<level::ERR>(
	fmt::format(
	"readUserCapHwmon: Could not find a power cap file to read: {})",
	pcapBasePathname.c_str())
	.c_str());
	return 0;
	}

	// Open the sysfs file and read the power cap
	std::ifstream file(userCapName, std::ios::in);
	if (file)
	{
	uint64_t cap;
	file >> cap;
	file.close();
	// Convert to Watts
	userCap = cap / 1000000;
	}
	else
	{
	log<level::ERR>(
	fmt::format("readUserCapHwmon: Failed reading {} (errno={})",
	userCapName.c_str(), errno)
	.c_str());
	}

	return userCap;
	}

	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);

	bool changeFound = false;
	for (const auto& [prop, value] : msgData)
	{
	if (prop == POWER_CAP_PROP)
	{
	pcap = std::get<uint32_t>(value);
	pcapEnabled = getPcapEnabled();
	changeFound = true;
	}
	else if (prop == POWER_CAP_ENABLE_PROP)
	{
	pcapEnabled = std::get<bool>(value);
	pcap = getPcap();
	changeFound = true;
	}
	else
	{
	// Ignore other properties
	log<level::DEBUG>(
	fmt::format(
	"pcapChanged: Unknown power cap property changed {} to {}",
	prop.c_str(), std::get<uint32_t>(value))
	.c_str());
	}
	}

	if (changeFound)
	{
	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;
	}

	// Update the Power Cap bounds on DBus
	bool PowerCap::updateDbusPcap(uint32_t hardMin, uint32_t max)
	{
	bool complete = true;

	try
	{
	utils::setProperty(PCAP_PATH, PCAP_INTERFACE, POWER_CAP_HARD_MIN,
	hardMin);
	}
	catch (const sdbusplus::exception::exception& e)
	{
	log<level::ERR>(
	fmt::format(
	"updateDbusPcap: Failed to set HARD PCAP to {}W due to {}",
	hardMin, e.what())
	.c_str());
	complete = false;
	}

	try
	{
	utils::setProperty(PCAP_PATH, PCAP_INTERFACE, POWER_CAP_MAX, max);
	}
	catch (const sdbusplus::exception::exception& e)
	{
	log<level::ERR>(
	fmt::format(
	"updateDbusPcap: Failed to set MAX PCAP to {}W due to {}", max,
	e.what())
	.c_str());
	complete = false;
	}

	return complete;
	}
	} // namespace powercap

	} // namespace occ

	} // namespace open_power