dcmihandler.hpp

#ifndef __HOST_IPMI_DCMI_HANDLER_H__
#define __HOST_IPMI_DCMI_HANDLER_H__

#include <map>
#include <string>
#include <vector>
#include <sdbusplus/bus.hpp>
#include "nlohmann/json.hpp"

namespace dcmi
{

enum Commands
{
    // Get capability bits
    GET_CAPABILITIES = 0x01,
    GET_POWER_LIMIT = 0x03,
    SET_POWER_LIMIT = 0x04,
    APPLY_POWER_LIMIT = 0x05,
    GET_ASSET_TAG = 0x06,
    SET_ASSET_TAG = 0x08,
    GET_MGMNT_CTRL_ID_STR = 0x09,
    SET_MGMNT_CTRL_ID_STR = 0x0A,
    GET_TEMP_READINGS = 0x10,
};

static constexpr auto propIntf = "org.freedesktop.DBus.Properties";
static constexpr auto assetTagIntf =
        "xyz.openbmc_project.Inventory.Decorator.AssetTag";
static constexpr auto assetTagProp = "AssetTag";
static constexpr auto networkServiceName = "xyz.openbmc_project.Network";
static constexpr auto networkConfigObj =
        "/xyz/openbmc_project/network/config";
static constexpr auto networkConfigIntf =
        "xyz.openbmc_project.Network.SystemConfiguration";
static constexpr auto hostNameProp = "HostName";
static constexpr auto temperatureSensorType = 0x01;

namespace assettag
{

    using ObjectPath = std::string;
    using Service = std::string;
    using Interfaces = std::vector<std::string>;
    using ObjectTree = std::map<ObjectPath, std::map<Service, Interfaces>>;

} //namespace assettag

namespace temp_readings
{
    static constexpr auto maxDataSets = 8;
    static constexpr auto maxInstances = 255;
    static constexpr auto maxTemp = 128; // degrees C
    static constexpr auto configFile =
        "/usr/share/ipmi-providers/dcmi_temp_readings.json";

    /** @struct Response
     *
     *  DCMI payload for Get Temperature Readings response
     */
    struct Response
    {
#if BYTE_ORDER == LITTLE_ENDIAN
        uint8_t temperature: 7;   //!< Temperature reading in Celsius
        uint8_t sign: 1;          //!< Sign bit
#endif
#if BYTE_ORDER == BIG_ENDIAN
        uint8_t sign: 1;          //!< Sign bit
        uint8_t temperature: 7;   //!< Temperature reading in Celsius
#endif
        uint8_t instance;       //!< Entity instance number
    } __attribute__((packed));

    using ResponseList = std::vector<Response>;
    using NumInstances = size_t;
    using Value = uint8_t;
    using Sign = bool;
    using Temperature = std::tuple<Value, Sign>;
    using Json = nlohmann::json;
}

static constexpr auto groupExtId = 0xDC;

static constexpr auto assetTagMaxOffset = 62;
static constexpr auto assetTagMaxSize = 63;
static constexpr auto maxBytes = 16;
static constexpr size_t maxCtrlIdStrLen = 63;

/** @struct GetAssetTagRequest
 *
 *  DCMI payload for Get Asset Tag command request.
 */
struct GetAssetTagRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t offset;             //!< Offset to read.
    uint8_t bytes;              //!< Number of bytes to read.
} __attribute__((packed));

/** @struct GetAssetTagResponse
 *
 *  DCMI payload for Get Asset Tag command response.
 */
struct GetAssetTagResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t tagLength;          //!< Total asset tag length.
} __attribute__((packed));

/** @struct SetAssetTagRequest
 *
 *  DCMI payload for Set Asset Tag command request.
 */
struct SetAssetTagRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t offset;             //!< Offset to write.
    uint8_t bytes;              //!< Number of bytes to write.
} __attribute__((packed));

/** @struct SetAssetTagResponse
 *
 *  DCMI payload for Set Asset Tag command response.
 */
struct SetAssetTagResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t tagLength;          //!< Total asset tag length.
} __attribute__((packed));

/** @brief Read the object tree to fetch the object path that implemented the
 *         Asset tag interface.
 *
 *  @param[in,out] objectTree - object tree
 *
 *  @return On success return the object tree with the object path that
 *          implemented the AssetTag interface.
 */
void readAssetTagObjectTree(dcmi::assettag::ObjectTree& objectTree);

/** @brief Read the asset tag of the server
 *
 *  @return On success return the asset tag.
 */
std::string readAssetTag();

/** @brief Write the asset tag to the asset tag DBUS property
 *
 *  @param[in] assetTag - Asset Tag to be written to the property.
 */
void writeAssetTag(const std::string& assetTag);

/** @brief Read the current power cap value
 *
 *  @param[in] bus - dbus connection
 *
 *  @return On success return the power cap value.
 */
uint32_t getPcap(sdbusplus::bus::bus& bus);

/** @brief Check if the power capping is enabled
 *
 *  @param[in] bus - dbus connection
 *
 *  @return true if the powerCap is enabled and false if the powercap
 *          is disabled.
 */
bool getPcapEnabled(sdbusplus::bus::bus& bus);

/** @struct GetPowerLimitRequest
 *
 *  DCMI payload for Get Power Limit command request.
 */
struct GetPowerLimitRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint16_t reserved;          //!< Reserved
} __attribute__((packed));

/** @struct GetPowerLimitResponse
 *
 *  DCMI payload for Get Power Limit command response.
 */
struct GetPowerLimitResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint16_t reserved;          //!< Reserved.
    uint8_t exceptionAction;    //!< Exception action.
    uint16_t powerLimit;        //!< Power limit requested in watts.
    uint32_t correctionTime;    //!< Correction time limit in milliseconds.
    uint16_t reserved1;         //!< Reserved.
    uint16_t samplingPeriod;    //!< Statistics sampling period in seconds.
} __attribute__((packed));

/** @brief Set the power cap value
 *
 *  @param[in] bus - dbus connection
 *  @param[in] powerCap - power cap value
 */
void setPcap(sdbusplus::bus::bus& bus, const uint32_t powerCap);

/** @struct SetPowerLimitRequest
 *
 *  DCMI payload for Set Power Limit command request.
 */
struct SetPowerLimitRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint16_t reserved;          //!< Reserved
    uint8_t reserved1;          //!< Reserved
    uint8_t exceptionAction;    //!< Exception action.
    uint16_t powerLimit;        //!< Power limit requested in watts.
    uint32_t correctionTime;    //!< Correction time limit in milliseconds.
    uint16_t reserved2;         //!< Reserved.
    uint16_t samplingPeriod;    //!< Statistics sampling period in seconds.
} __attribute__((packed));

/** @struct SetPowerLimitResponse
 *
 *  DCMI payload for Set Power Limit command response.
 */
struct SetPowerLimitResponse
{
    uint8_t groupID;            //!< Group extension identification.
} __attribute__((packed));

/** @brief Enable or disable the power capping
 *
 *  @param[in] bus - dbus connection
 *  @param[in] enabled - enable/disable
 */
void setPcapEnable(sdbusplus::bus::bus& bus, bool enabled);

/** @struct ApplyPowerLimitRequest
 *
 *  DCMI payload for Activate/Deactivate Power Limit command request.
 */
struct ApplyPowerLimitRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t powerLimitAction;   //!< Power limit activation
    uint16_t reserved;          //!< Reserved
} __attribute__((packed));

/** @struct ApplyPowerLimitResponse
 *
 *  DCMI payload for Acticate/Deactivate Power Limit command response.
 */
struct ApplyPowerLimitResponse
{
    uint8_t groupID;            //!< Group extension identification.
} __attribute__((packed));

/** @struct GetMgmntCtrlIdStrRequest
 *
 *  DCMI payload for Get Management Controller Identifier String cmd request.
 */
struct GetMgmntCtrlIdStrRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t offset;             //!< Offset to read.
    uint8_t bytes;              //!< Number of bytes to read.
} __attribute__((packed));

/** @struct GetMgmntCtrlIdStrResponse
 *
 *  DCMI payload for Get Management Controller Identifier String cmd response.
 */
struct GetMgmntCtrlIdStrResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t strLen;             //!< ID string length.
    char data[];                //!< ID string
} __attribute__((packed));

/** @struct SetMgmntCtrlIdStrRequest
 *
 *  DCMI payload for Set Management Controller Identifier String cmd request.
 */
struct SetMgmntCtrlIdStrRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t offset;             //!< Offset to write.
    uint8_t bytes;              //!< Number of bytes to read.
    char data[];                //!< ID string
} __attribute__((packed));

/** @struct GetMgmntCtrlIdStrResponse
 *
 *  DCMI payload for Get Management Controller Identifier String cmd response.
 */
struct SetMgmntCtrlIdStrResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t offset;             //!< Last Offset Written.
} __attribute__((packed));

/** @enum DCMICapParameters
 *
 * DCMI Capability parameters
 */
enum class DCMICapParameters
{
    SUPPORTED_DCMI_CAPS = 0x01,             //!< Supported DCMI Capabilities
    MANDATORY_PLAT_ATTRIBUTES = 0x02,       //!< Mandatory Platform Attributes
    OPTIONAL_PLAT_ATTRIBUTES = 0x03,        //!< Optional Platform Attributes
    MANAGEABILITY_ACCESS_ATTRIBUTES = 0x04, //!< Manageability Access Attributes
};

/** @struct GetDCMICapRequest
 *
 *  DCMI payload for Get capabilities cmd request.
 */
struct GetDCMICapRequest
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t param;              //!< Capability parameter selector.
} __attribute__((packed));

/** @struct GetDCMICapRequest
 *
 *  DCMI payload for Get capabilities cmd response.
 */
struct GetDCMICapResponse
{
    uint8_t groupID;            //!< Group extension identification.
    uint8_t major;              //!< DCMI Specification Conformance - major ver
    uint8_t minor;              //!< DCMI Specification Conformance - minor ver
    uint8_t paramRevision;      //!< Parameter Revision = 02h
    uint8_t data[];             //!< Capability array
} __attribute__((packed));

/** @struct DCMICap
 *
 *  DCMI capabilities protocol info.
 */
struct DCMICap
{
    std::string name;           //!< Name of DCMI capability.
    uint8_t bytePosition;       //!< Starting byte number from DCMI spec.
    uint8_t position;           //!< bit position from the DCMI spec.
    uint8_t length;             //!< Length of the value from DCMI spec.
};

using DCMICapList = std::vector<DCMICap>;

/** @struct DCMICapEntry
 *
 *  DCMI capabilities list and size for each parameter.
 */
struct DCMICapEntry
{
    uint8_t size;               //!< Size of capability array in bytes.
    DCMICapList capList;        //!< List of capabilities for a parameter.
};

using DCMICaps = std::map<DCMICapParameters, DCMICapEntry>;

/** @struct GetTempReadingsRequest
 *
 *  DCMI payload for Get Temperature Readings request
 */
struct GetTempReadingsRequest
{
    uint8_t groupID;             //!< Group extension identification.
    uint8_t sensorType;          //!< Type of the sensor
    uint8_t entityId;            //!< Entity ID
    uint8_t entityInstance;      //!< Entity Instance (0 means all instances)
    uint8_t instanceStart;       //!< Instance start (used if instance is 0)
} __attribute__((packed));

/** @struct GetTempReadingsResponse
 *
 *  DCMI header for Get Temperature Readings response
 */
struct GetTempReadingsResponseHdr
{
    uint8_t groupID;                //!< Group extension identification.
    uint8_t numInstances;           //!< No. of instances for requested id
    uint8_t numDataSets;            //!< No. of sets of temperature data
} __attribute__((packed));

namespace temp_readings
{
    /** @brief Read temperature from a d-bus object, scale it as per dcmi
     *         get temperature reading requirements.
     *
     *  @param[in] dbusService - the D-Bus service
     *  @param[in] dbusPath - the D-Bus path
     *
     *  @return A temperature reading
     */
    Temperature readTemp(const std::string& dbusService,
                         const std::string& dbusPath);

    /** @brief Parse out JSON config file containing information
     *         related to temperature readings.
     *
     *  @return A json object
     */
    Json parseConfig();

    /** @brief Read temperatures and fill up DCMI response for the Get
     *         Temperature Readings command. This looks at a specific
     *         instance.
     *
     *  @param[in] type - one of "inlet", "cpu", "baseboard"
     *  @param[in] instance - A non-zero Entity instance number
     *
     *  @return A tuple, containing a temperature reading and the
     *          number of instances.
     */
    std::tuple<Response, NumInstances> read (const std::string& type,
                                             uint8_t instance);

    /** @brief Read temperatures and fill up DCMI response for the Get
     *         Temperature Readings command. This looks at a range of
     *         instances.
     *
     *  @param[in] type - one of "inlet", "cpu", "baseboard"
     *  @param[in] instanceStart - Entity instance start index
     *
     *  @return A tuple, containing a list of temperature readings and the
     *          number of instances.
     */
    std::tuple<ResponseList, NumInstances> readAll(const std::string& type,
                                                   uint8_t instanceStart);
}

} // namespace dcmi

#endif