** Changed in: ubuntu-power-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1827755
Title:
nx842 - CRB request time out (-110) when uninstall NX modules and
initiate NX request
Status in The Ubuntu-power-systems project:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
[Impact]
PowerPC 842 hardware compression support is currently broken, this effects
workloads like zswap and others that exploit 842 hardware compression on Power.
[Test]
- Install nx-compress and nx-842-powernv modules
- Initiate NX request
- Uninstall these modules
- Initiate NX request again and we get CRB timeout with error -110
Test kernel available in the PPA, please see comment #4 and please see
comment #5 that verifies the PPA kernel works as expected.
[Fix]
IBM has identified that the following upstream patch fixes the issue:
656ecc16e8fc crypto/nx: Initialize 842 high and normal RxFIFO control
registers
[Regression Potential]
The patch only impacts the nx-842 modules, only available on PowerPC
architecture and does not have any impact on other architectures or generic
code. Risk of regression is very low.
[Other Info]
---Problem Description---
Normally nx-compress and nx-842-powernv modules are loaded when selects
842-nx compressor if not loaded and execute forever during system execution. So
we will not see this bug in normal case.
But we are seeing NX CRB request timeout when uninstall these modules
and load them or select 842-nx compressor.
---uname output---
18.04
Machine Type = P9 system
---Steps to Reproduce---
- Install nx-compress and nx-842-powernv modules
- Initiate NX request
- Uninstall these modules
- Initiate NX request again and we get CRB timeout with error -110
Patches are included in 4.19-rc1
6e708000ec2c93c2bde6a46aa2d6c3e80d4eaeb9 - powerpc/powernv: Export
opal_check_token symbol
656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca5 - crypto/nx: Initialize 842 high
and normal RxFIFO control registers
> Looks like the first commit was included in a recent 18.04 update
> (4.15.0-48.51), see
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819989
>
> but I don't see the second one there yet.
>
> If this is still needed, I would suggest getting this bug mirrored to LP to
> put on Canonical's radar.
We need second commit (656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca) to fix
this actual issue. But no use of having the first commit without
second one. The first one just exports opal_check_token symbol which
is used in the second commit.
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