# phosphor-psu-code-mgmt

phosphor-psu-code-mgmt is a service to provide management for PSU code,
including:

- PSU code version
- PSU code update

## Building

```text
meson build/ && ninja -C build
```

## Unit test

- Run it in OpenBMC CI, refer to [local-ci-build.md][1]
- Run it in [OE SDK][2], run below commands in a x86-64 SDK env:

  ```text
  meson -Doe-sdk=enabled -Dtests=enabled build/
  ninja -C build/ test  # Meson skips running the case due to it thinks it's cross compiling
  # Manually run the tests
  for t in `find build/test/ -maxdepth 1 -name "test_*"`; do ./$t || break ; done
  ```

## Vendor-specific tools

This repo contains generic code to handle the PSU versions and updates. It
depends on vendor-specific tools to provide the below functions on the real PSU
hardware:

- Get PSU firmware version
- Compare the firmware version
- Update the PSU firmware

It provides configure options for vendor-specific tools for the above functions:

- `PSU_VERSION_UTIL`: It shall be defined as a command-line tool that accepts
  the PSU inventory path as input, and outputs the PSU version string to stdout.
- `PSU_VERSION_COMPARE_UTIL`: It shall be defined as a command-line tool that
  accepts one or more PSU version strings, and outputs the latest version string
  to stdout.
- `PSU_UPDATE_SERVICE`: It shall be defined as a systemd service that accepts
  two arguments:
  - The PSU inventory DBus object;
  - The path of the PSU image(s).

For example:

```text
meson -Dtests=disabled \
    '-DPSU_VERSION_UTIL=/usr/bin/psutils --raw --get-version' \
    '-DPSU_VERSION_COMPARE_UTIL=/usr/bin/psutils --raw --compare' \
    '-DPSU_UPDATE_SERVICE=psu-update@.service' \
    build
```

The above configures the vendor-specific tools to use `psutils` from
[phosphor-power][3] to get and compare the PSU versions, and use
`psu-update@.service` to perform the PSU firmware update, where internally it
invokes `psutils` as well.

## Usage

### PSU version

When the service starts, it queries the inventory to get all the PSU inventory
paths, invokes the vendor-specific tool to get the versions, and creates version
objects under `/xyz/openbmc_project/software` that are associated with the PSU
inventory path. If multiple PSUs are using the same version, multiple PSU
inventory paths are associated.

E.g.

- Example of system with two PSUs that have different versions:

  ```text
   "/xyz/openbmc_project/software/02572429": {
     "Activation": "xyz.openbmc_project.Software.Activation.Activations.Active",
     "Associations": [
       [
         "inventory",
         "activation",
         "/xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply1"
       ]
     ],
     "ExtendedVersion": "",
     "Path": "",
     "Purpose": "xyz.openbmc_project.Software.Version.VersionPurpose.PSU",
     "RequestedActivation": "xyz.openbmc_project.Software.Activation.RequestedActivations.None",
     "Version": "01120114"
   },
   "/xyz/openbmc_project/software/7094f612": {
     "Activation": "xyz.openbmc_project.Software.Activation.Activations.Active",
     "Associations": [
       [
         "inventory",
         "activation",
         "/xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply0"
       ]
     ],
     "ExtendedVersion": "",
     "Path": "",
     "Purpose": "xyz.openbmc_project.Software.Version.VersionPurpose.PSU",
     "RequestedActivation": "xyz.openbmc_project.Software.Activation.RequestedActivations.None",
     "Version": "00000110"
   },
  ```

- Example of system with two PSUs that have the same version:

  ```text
   "/xyz/openbmc_project/software/9463c2ad": {
     "Activation": "xyz.openbmc_project.Software.Activation.Activations.Active",
     "Associations": [
       [
         "inventory",
         "activation",
         "/xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply0"
       ],
       [
         "inventory",
         "activation",
         "/xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply1"
       ]
     ],
     "ExtendedVersion": "",
     "Path": "",
     "Purpose": "xyz.openbmc_project.Software.Version.VersionPurpose.PSU",
     "RequestedActivation": "xyz.openbmc_project.Software.Activation.RequestedActivations.None",
     "Version": "01100110"
   },
  ```

### PSU update

1. Generate a tarball of PSU firmware image by [generate-psu-tar tool][4].

   ```text
   ./generate-psu-tar --image <psu-image> --version <version> --model <model> --manufacturer \
   <manufacturer> --machineName <machineName> --outfile <psu.tar> --sign
   ```

2. To update the PSU firmware, follow the same steps as described in
   [code-update.md][5]:
   - Upload a PSU image tarball and get the version ID;
   - Set the RequestedActivation state of the uploaded image's version ID.
   - Check the state and wait for the activation to be completed.
3. After a successful update, the PSU image and the manifest is stored in BMC's
   persistent storage defined by `IMG_DIR_PERSIST`. When a PSU is replaced, the
   PSU's firmware version will be checked and updated if it's older than the one
   stored in BMC.
4. It is possible to put a PSU image and MANIFEST in the built-bin OpenBMC image
   in BMC's read-only filesystem defined by `IMG_DIR_BUILTIN`. When the service
   starts, it will compare the versions of the built-in image, the stored image
   (after PSU update), and the existing PSUs, if there is any PSU that has an
   older firmware, it will be updated to the newest one.

[1]: https://github.com/openbmc/docs/blob/master/testing/local-ci-build.md
[2]:
  https://github.com/openbmc/docs/blob/master/cheatsheet.md#building-the-openbmc-sdk
[3]: https://github.com/openbmc/phosphor-power/tree/master/tools/power-utils
[4]:
  https://github.com/openbmc/phosphor-psu-code-mgmt/blob/master/tools/generate-psu-tar
[5]:
  https://github.com/openbmc/docs/blob/master/architecture/code-update/code-update.md