commit	ab6d79bb1c8f9431e215f2de73ff6ce4e0378f72	[log] [tgz]
author	Patrick Williams <patrick@stwcx.xyz>	Fri Oct 20 11:19:05 2023 -0500
committer	Patrick Williams <patrick@stwcx.xyz>	Fri Oct 20 11:19:05 2023 -0500
tree	c7b8c3b88b4d9f2d65ee411736330387674cc240
parent	839141e51099b110418d440e7886655b2c546d3f [diff]

tree: c7b8c3b88b4d9f2d65ee411736330387674cc240

README.md

phosphor-nvme

Introduction

phosphor-nvme is the nvme manager service maintains for NVMe drive information update and related notification processing service. The service update information to xyz/openbmc_project/Nvme/Status.interface.yaml, xyz/openbmc_project/Sensor/Value.interface.yaml and other interfaces in xyz.openbmc_project.Inventory.Manager.

General usage

The service xyz.openbmc_project.nvme.manager provides object on D-Bus:

/xyz/openbmc_project/sensors/temperature/nvme(index)

where object implements interface xyz.openbmc_project.Sensor.Value.

NVMe drive export as sensor and sensor value is temperature of drive. It can get the sensor value of the drive through ipmitool command sdr elist if the corresponding settings in the sensor map are configured correctly. For example:

To get sensor value:

### With ipmi command on BMC
ipmitool sdr elist

The service also updates other NVMe drive information to D-bus xyz.openbmc_project.Inventory.Manager. The service xyz.openbmc_project.Inventory.Manager provides object on D-Bus:

/xyz/openbmc_project/inventory/system/chassis/motherboard/nvme(index)

where object implements interfaces:

xyz.openbmc_project.Inventory.Item
xyz.openbmc_project.Inventory.Decorator.Asset
xyz.openbmc_project.Nvme.Status

Interface xyz.openbmc_project.Nvme.Status with the following properties:

Property	Type	Description
SmartWarnings	string	Indicates smart warnings for the state
StatusFlags	string	Indicates the status of the drives
DriveLifeUsed	string	A vendor specific estimate of the percentage
TemperatureFault	bool	If warning type about temperature happened
BackupdrivesFault	bool	If warning type about backup drives happened
CapacityFault	bool	If warning type about capacity happened
DegradesFault	bool	If warning type about degrades happened
MediaFault	bool	If warning type about media happened

Interface xyz.openbmc_project.Inventory.Item with the following properties:

Property	Type	Description
Present	bool	Whether or not the item is present

Interface xyz.openbmc_project.Inventory.Decorator.Asset with the following properties:

Property	Type	Description
SerialNumber	string	The item serial number
Manufacturer	string	The item manufacturer

Each property in the inventory manager can be obtained via the busctl get-property command. For example:

To get property Present:

### With busctl on BMC
busctl get-property xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard/nvme0 xyz.openbmc_project.Inventory.Item Present

Configuration file

There is a JSON configuration file nvme_config.json for drive index, bus ID, and the LED object path and bus name for each drive. For example,

{
  "config": [
    {
      "NVMeDriveIndex": 0,
      "NVMeDriveBusID": 16,
      "NVMeDriveFaultLEDGroupPath": "/xyz/openbmc_project/led/groups/led_u2_0_fault",
      "NVMeDriveLocateLEDGroupPath": "/xyz/openbmc_project/led/groups/led_u2_0_locate",
      "NVMeDriveLocateLEDControllerBusName": "xyz.openbmc_project.LED.Controller.led_u2_0_locate",
      "NVMeDriveLocateLEDControllerPath": "/xyz/openbmc_project/led/physical/led_u2_0_locate",
      "NVMeDrivePresentPin": 148,
      "NVMeDrivePwrGoodPin": 161
    },
    {
      "NVMeDriveIndex": 1,
      "NVMeDriveBusID": 17,
      "NVMeDriveFaultLEDGroupPath": "/xyz/openbmc_project/led/groups/led_u2_1_fault",
      "NVMeDriveLocateLEDGroupPath": "/xyz/openbmc_project/led/groups/led_u2_1_locate",
      "NVMeDriveLocateLEDControllerBusName": "xyz.openbmc_project.LED.Controller.led_u2_1_locate",
      "NVMeDriveLocateLEDControllerPath": "/xyz/openbmc_project/led/physical/led_u2_1_locate",
      "NVMeDrivePresentPin": 149,
      "NVMeDrivePwrGoodPin": 162
    }
  ],
  "threshold": [
    {
      "criticalHigh": 70,
      "criticalLow": 0,
      "maxValue": 70,
      "minValue": 0
    }
  ]
}

config
- NvmeDriveIndex: The index of the NVMe drive, which will be displayed in the object path.
- NVMeDriveBusID: The bus id of the NVMe drive, since it communicates with SMBus.
- NVMeDriveFaultLEDGroupPath: Object path of fault LED in LED Group Manager.
- NVMeDriveLocateLEDGroupPath: Object path of locate LED in LED Group Manager.
- NVMeDriveLocateLEDControllerBusName: D-Bus name of locate LED in LED Controller.
- NVMeDriveLocateLEDControllerPath: Object path of locate LED in LED Controller.
- NVMeDrivePresentPin: Gpio present pin of NVMe drive.
- NVMeDrivePwrGoodPin: Gpio Power good pin of NVMe drive.
threshold
- criticalHigh: Upper critical threshold.
- criticalLow: Lower critical threshold.
- maxValue: Sensor maximum value.
- minValue: Sensor value.

Process

It will register a D-bus called xyz.openbmc_project.nvme.manager description above.
Obtain the drive index, bus ID, GPIO present pin, power good pin and fault LED object path from the json file mentioned above.
Each cycle will do following steps:
1. Check if the present pin of target drive is true, if true, means drive exists and go to next step. If not, means drive does not exists and remove object path from D-bus by drive index.
2. Check if the power good pin of target drive is true, if true means drive is ready then create object path by drive index and go to next step. If not, means drive power abnormal, turn on fault LED and log in journal.
3. Send a NVMe-MI command via SMBus Block Read protocol by bus ID of target drive to get data. Data get from NVMe drives are "Status Flags", "SMART Warnings", "Temperature", "Percentage Drive Life Used", "Vendor ID", and "Serial Number".
4. The data will be set to the properties in D-bus.

This service will run automatically and look up NVMe drives every second.