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ipmi_sensors.md

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IPMI sensor types

Based on talos.xml, sorted by reg of /bmc/sensors/sensor@... nodes:

reg Name in talos.xml IPMI sensor type Notes
0x01 host_status_sensor 0x22
0x02 fw_boot_sensor 0x0F
0x03-0x04 occ_active_sensor 0x07 One per CPU, only if CPU is installed
0x05 not used
0x06-0x07 cpu_temp_sensor 0x01 One per CPU, only if CPU is installed
0x08-0x09 cpu_func_sensor 0x07 One per CPU, only if CPU is installed
0x0A dimm_freq_sensor 0xC1 Only one (does it limit DIMM population rules?)
0x0B-0x1A dimm_func_sensor 0x0C One per DIMM, regs for empty slots are skipped
0x1B-0x2A dimm_temp_sensor 0x01 One per DIMM, regs for empty slots are skipped
0x2B-0x5A cpucore_func_sensor 0x07 One per core, not filled by Hostboot
0x5B-0x8A cpucore_temp_sensor 0x01 One per core, not filled by Hostboot
0x8B boot_count_sensor 0xC3
0x8C motherboard_fault_sensor 0xC7
0x8D ref_clk_sensor 0xC7
0x8E pci_clk_sensor 0xC7
0x8F tod_clk_sensor 0xC7
0x90 system_event_sensor 0x12
0x91 os_boot_sensor 0x1F
0x92 pci_link_sensor 0xC4
0x93 apss_fault_sensor 0xC7
0x94 power_cap_sensor 0xC2
0x95 ps_redundancy_state_sensor 0xCA
0x96 ps_derating_sensor 0xC8
0x97 power_limit_sensor 0xC6
0x98-0x9F not used
0xA0-0xCF cpucore_freq_sensor 0xC1 One per core, not filled by Hostboot
0xD0-0xFF not used

Sensors in Hostboot

Targets with IPMI sensors have ATTR_IPMI_SENSORS attribute.

ATTR_IPMI_SENSORS is a fixed-size array of type uint16_t[16][2]. Single array entry consists of a sensor name and its IPMI number. IPMI number is just one byte, which makes it easy to read value of the attribute. Entries of the array are sorted by sensor name and are looked up via binary search. Unused entries look like 0xFFFF, 0xFF and are thus located at the end of the array.

Sensor name looks like 0xAABB where AA is its major type and BB its minor type. Minor type (also called sub-type) corresponds to entity ID in IPMI specification.

From obj/genfiles/attributeenums.H:

/**
 *  @brief Enumeration defining the offsets into the IPMI_SENSORS array.
 */
enum IPMI_SENSOR_ARRAY
{
    IPMI_SENSOR_ARRAY_NAME_OFFSET   = 0x00000000,
    IPMI_SENSOR_ARRAY_NUMBER_OFFSET = 0x00000001,
};

/**
 *  @brief Enumeration indicating the IPMI sensor name, which will be used
 *  by hostboot when determining the sensor number to return. The
 *  sensor name consists of one byte of sensor type plus one byte of
 *  sub-type, to differentiate similar sensors under the same target.
 *  Our implementaion uses the IPMI defined entity ID as the sub-type.
 */
enum SENSOR_NAME
{
    SENSOR_NAME_PROC_TEMP                = 0x00000103,
    SENSOR_NAME_DIMM_TEMP                = 0x00000120,
    SENSOR_NAME_CORE_TEMP                = 0x000001D0,
    SENSOR_NAME_STATE                    = 0x00000500,
    SENSOR_NAME_MEMBUF_TEMP              = 0x000001D1,
    SENSOR_NAME_GPU_TEMP                 = 0x000001D8,
    SENSOR_NAME_GPU_MEM_TEMP             = 0x000001D9,
    SENSOR_NAME_VRM_VDD_TEMP             = 0x000001DA,
    SENSOR_NAME_GPU_STATE                = 0x000017D8,
    SENSOR_NAME_PROC_STATE               = 0x00000703,
    SENSOR_NAME_CORE_STATE               = 0x000007D0,
    SENSOR_NAME_HOST_AUTO_REBOOT_CONTROL = 0x00000921,
    SENSOR_NAME_DIMM_STATE               = 0x00000C20,
    SENSOR_NAME_HB_VOLATILE              = 0x00000C21,
    SENSOR_NAME_MEMBUF_STATE             = 0x00000CD1,
    SENSOR_NAME_FW_BOOT_PROGRESS         = 0x00000F22,
    SENSOR_NAME_SYSTEM_EVENT             = 0x00001201,
    SENSOR_NAME_OS_BOOT                  = 0x00001F23,
    SENSOR_NAME_HOST_STATUS              = 0x00002223,
    SENSOR_NAME_OCC_ACTIVE               = 0x000007D2,
    SENSOR_NAME_CORE_FREQ                = 0x0000C1D0,
    SENSOR_NAME_APSS_CHANNEL             = 0x0000C2D7,
    SENSOR_NAME_PCI_ACTIVE               = 0x0000C423,
    SENSOR_NAME_REBOOT_COUNT             = 0x0000C322,
    SENSOR_NAME_FAULT                    = 0x0000C700,
    SENSOR_NAME_BACKPLANE_FAULT          = 0x0000C707,
    SENSOR_NAME_REF_CLOCK_FAULT          = 0x0000C7D4,
    SENSOR_NAME_PCI_CLOCK_FAULT          = 0x0000C7D5,
    SENSOR_NAME_TOD_CLOCK_FAULT          = 0x0000C7D6,
    SENSOR_NAME_APSS_FAULT               = 0x0000C7D7,
    SENSOR_NAME_VRM_VDD_FAULT            = 0x0000C707,
    SENSOR_NAME_DERATING_FACTOR          = 0x0000C815,
    SENSOR_NAME_REDUNDANT_PS_POLICY      = 0x0000CA22,
    SENSOR_NAME_TURBO_ALLOWED            = 0x0000CB03,
    SENSOR_NAME_TPM_REQUIRED             = 0x0000CC03,
    SENSOR_NAME_PCI_BIFURCATED           = 0x0000CD03,
};