eBMC State Management: Enable Warm IPL ( Warm Re-IPL )

[vishwabmc]

In the scenarios where the Host crashes and thus demanding a reboot of the Host, we don't have to start all over again doing powerOff + PowerOn. Instead, we could bypass the whole PowerOn sequence and directly jump to Host portion of it. This story is to enable such a Warm Re-IPL

[vishwabmc]

There are 2 usecases of this:

1/. Host asking the BMC to do the Warm Reboot: This will be the case during OS lid updates. --> This would be a PLDM command asking for such a Re-IPL.

2/. Host crash --> Need to chain the sequence post Quiesce

[geissonator]

Stop Instructions Story: https://github.com/ibm-openbmc/dev/issues/736 Although, we may be able to just do a "pdbg -a" initially to stop instructions.

[geissonator]

My plan is to at least get the target framework and basic services in place. May need to move a few points from this into a follow on story depending on how much extra application work is needed to do the full warm reboot.

[geissonator]

Some additional work this entailed:

• Working with DMTF to understand mappings to ResetType - https://redfishforum.com/thread/261/host-warm-reboots
• A new design doc for the new host states - https://github.com/openbmc/docs/blob/master/designs/state-management-and-external-interfaces.md
• New phosphor-dbus-interfaces - https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/State/Host.interface.yaml#L35
• DTS updates to name gpio pins so new libgpiod can be used with cfam-reset (required for warm re-ipl) - https://lists.ozlabs.org/pipermail/openbmc/2020-February/020425.html
• Creation of new targets - https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-state-manager/+/28879

Still in process:

• Support in phosphor-state-manager for new interfaces
• Support in openpower-proc-control to stop instructions and cfam reset

[geissonator]

Everything tested and ready. Waiting on kernel dts change to get in:

• https://lists.ozlabs.org/pipermail/openbmc/2020-February/020425.html

proc-control changes:

• https://gerrit.openbmc-project.xyz/c/openbmc/openpower-proc-control/+/29087/7
• https://gerrit.openbmc-project.xyz/c/openbmc/meta-openpower/+/29470

state-manager changes:

• https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-state-manager/+/29334
• https://gerrit.openbmc-project.xyz/c/openbmc/meta-phosphor/+/29471

[geissonator]

Everything is in and verified on witherspoon-128