[Bug 1904585] [NEW] opal-prd: Have a worker process handle page offlining (Fixes "PlatServices: dyndealloc memory_error() failed" is getting reported in error log (opal-prd))

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--Problem Description---

https://github.com/open-
power/skiboot/commit/8cbd0de88d162e387f11569eee1bdecef8fad2e3

opal-prd: Have a worker process handle page offlining

The memory_error() hservice interface expects the memory_error() call to
just accept the offline request and return without actually offlining the
memory. Currently we will attempt to offline the marked pages before
returning to HBRT which can result in an excessively long time spent in the
memory_error() hservice call which blocks HBRT from processing other
errors. Fix this by adding a worker process which performs the page
offlining via the sysfs memory error interfaces.

Reviewed-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall at gmail.com>

Thanks in advance for your support.
 
Machine Type = Power8 and Power9 OPAL systems 
 
---Steps to Reproduce---
* Inject memory error (UE) 
* Verify that opal-prd doesn't return asynchronously to the platform after requesting the memory offlining operation
 
Userspace tool common name: opal-prd 
 
We need this fix for 16.04.x and 18.04.x LTS releases.

Fix also is needed for 20.04 and 20.10.

** Affects: ubuntu-power-systems
     Importance: Critical
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: In Progress

** Affects: skiboot (Ubuntu)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress

** Affects: skiboot (Ubuntu Xenial)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress

** Affects: skiboot (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress

** Affects: skiboot (Ubuntu Focal)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress

** Affects: skiboot (Ubuntu Groovy)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress

** Affects: skiboot (Ubuntu Hirsute)
     Importance: Undecided
     Assignee: Matthieu Clemenceau (mclemenceau)
         Status: In Progress


** Tags: architecture-ppc64le bugnameltc-189252 fr-935 patch severity-critical targetmilestone-inin18045
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opal-prd: Have a worker process handle page offlining (Fixes "PlatServices: dyndealloc memory_error() failed" is getting reported in error log (opal-prd))
https://bugs.launchpad.net/bugs/1904585
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