Documentation/hwmon/smpro-hwmon.rst

   1 .. SPDX-License-Identifier: GPL-2.0-only
   2
   3 Kernel driver Ampere(R)'s Altra(R) SMpro hwmon
   4 ==============================================
   5
   6 Supported chips:
   7
   8   * Ampere(R) Altra(R)
   9
  10     Prefix: ``smpro``
  11
  12     Reference: `Altra SoC BMC Interface Specification`
  13
  14 Author: Thu Nguyen <thu@os.amperecomputing.com>
  15
  16 Description
  17 -----------
  18 The smpro-hwmon driver supports hardware monitoring for Ampere(R) Altra(R)
  19 SoCs based on the SMpro co-processor (SMpro).  The following sensor metrics
  20 are supported by the driver:
  21
  22   * temperature
  23   * voltage
  24   * current
  25   * power
  26
  27 The interface provides the registers to query the various sensors and
  28 their values which are then exported to userspace by this driver.
  29
  30 Usage Notes
  31 -----------
  32
  33 The driver creates at least two sysfs files for each sensor.
  34
  35 * ``<sensor_type><idx>_label`` reports the sensor label.
  36 * ``<sensor_type><idx>_input`` returns the sensor value.
  37
  38 The sysfs files are allocated in the SMpro rootfs folder, with one root
  39 directory for each instance.
  40
  41 When the SoC is turned off, the driver will fail to read registers and
  42 return ``-ENXIO``.
  43
  44 Sysfs entries
  45 -------------
  46
  47 The following sysfs files are supported:
  48
  49 * Ampere(R) Altra(R):
  50
  51   ============    =============  ======  ===============================================
  52   Name            Unit           Perm    Description
  53   ============    =============  ======  ===============================================
  54   temp1_input     millicelsius   RO      SoC temperature
  55   temp2_input     millicelsius   RO      Max temperature reported among SoC VRDs
  56   temp2_crit      millicelsius   RO      SoC VRD HOT Threshold temperature
  57   temp3_input     millicelsius   RO      Max temperature reported among DIMM VRDs
  58   temp4_input     millicelsius   RO      Max temperature reported among Core VRDs
  59   temp5_input     millicelsius   RO      Temperature of DIMM0 on CH0
  60   temp5_crit      millicelsius   RO      MEM HOT Threshold for all DIMMs
  61   temp6_input     millicelsius   RO      Temperature of DIMM0 on CH1
  62   temp6_crit      millicelsius   RO      MEM HOT Threshold for all DIMMs
  63   temp7_input     millicelsius   RO      Temperature of DIMM0 on CH2
  64   temp7_crit      millicelsius   RO      MEM HOT Threshold for all DIMMs
  65   temp8_input     millicelsius   RO      Temperature of DIMM0 on CH3
  66   temp8_crit      millicelsius   RO      MEM HOT Threshold for all DIMMs
  67   temp9_input     millicelsius   RO      Temperature of DIMM0 on CH4
  68   temp9_crit      millicelsius   RO      MEM HOT Threshold for all DIMMs
  69   temp10_input    millicelsius   RO      Temperature of DIMM0 on CH5
  70   temp10_crit     millicelsius   RO      MEM HOT Threshold for all DIMMs
  71   temp11_input    millicelsius   RO      Temperature of DIMM0 on CH6
  72   temp11_crit     millicelsius   RO      MEM HOT Threshold for all DIMMs
  73   temp12_input    millicelsius   RO      Temperature of DIMM0 on CH7
  74   temp12_crit     millicelsius   RO      MEM HOT Threshold for all DIMMs
  75   temp13_input    millicelsius   RO      Max temperature reported among RCA VRDs
  76   in0_input       millivolts     RO      Core voltage
  77   in1_input       millivolts     RO      SoC voltage
  78   in2_input       millivolts     RO      DIMM VRD1 voltage
  79   in3_input       millivolts     RO      DIMM VRD2 voltage
  80   in4_input       millivolts     RO      RCA VRD voltage
  81   cur1_input      milliamperes   RO      Core VRD current
  82   cur2_input      milliamperes   RO      SoC VRD current
  83   cur3_input      milliamperes   RO      DIMM VRD1 current
  84   cur4_input      milliamperes   RO      DIMM VRD2 current
  85   cur5_input      milliamperes   RO      RCA VRD current
  86   power1_input    microwatts     RO      Core VRD power
  87   power2_input    microwatts     RO      SoC VRD power
  88   power3_input    microwatts     RO      DIMM VRD1 power
  89   power4_input    microwatts     RO      DIMM VRD2 power
  90   power5_input    microwatts     RO      RCA VRD power
  91   ============    =============  ======  ===============================================
  92
  93   Example::
  94
  95     # cat in0_input
  96     830
  97     # cat temp1_input
  98     37000
  99     # cat curr1_input
 100     9000
 101     # cat power5_input
 102     19500000