** Tags added: triage-g
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https://bugs.launchpad.net/bugs/1721070
Title:
powerpc/64s: Add workaround for P9 vector CI load issuenext
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Thanks for the update, Mauricio.
It would be great if you could re-submit the backports you have.
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https://bugs.launchpad.net/bugs/1721070
Title:
powerpc/64s: Add workaround for P9
Joseph,
Again, thanks.
I had a few suggestions on the submitted backports, and observed a subtle
problem in one of them.
If you prefer, I can submit the ones I have here, if that saves you some cycles.
cheers,
Mauricio
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SRU requests submitted:
Artful: https://lists.ubuntu.com/archives/kernel-team/2017-October/087488.html
Zesty: https://lists.ubuntu.com/archives/kernel-team/2017-October/087491.html
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** Description changed:
- -- Problem Description --
+
+ == SRU Justification ==
POWER9 DD2.1 and earlier has an issue where some cache inhibited
- vector load will return bad data. The workaround is two part, one
+ vector load will return bad data. The fix is two part, one
firmware/microcode
** Changed in: linux (Ubuntu Zesty)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
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Hi @jsalisbury
> I also built a 4.10 based test kernel(16.04.3). [snip]
Thanks.
> Can you test this kernel and see if it resolves this bug?
Yes, it does.
I have verified both the patched one (4.10.0-35.39~lp1721070), which passes,
and its original version (4.10.0-35.39), which fails; so the
Joseph,
Quick update on this bug.
I tested your artful test and:
a) It didn't cause any regression. I tested on two P9 with different
processor level and P8 and the code runs fine.
b) It seems to be fixing the issue that is proposed to fix.
c) There are some test cases that are still failing,
I also built a 4.10 based test kernel(16.04.3). It required commit
ccd3cd361 and a3d96f70c1 as prerequisites. The test kernel can be
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1721070/zesty
Can you test this kernel and see if it resolves this bug?
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The commits are in the master branch:
0f5d387 powerpc/64s: Add workaround for P9 vector CI load issue
d401742 powerpc/mce: Move 64-bit machine check code into mce.c
1e3dad9 UBUNTU: Ubuntu-4.13.0-12.13
1f46464 UBUNTU: [Config] CONFIG_I2C_XLP9XX=m
I'll check to ensure I tar'd up the right tree.
I do see them in that tar file. Can you run:
tar -xvf lp1721070-source.tar
cd ubuntu-artful/
git log --oneline
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Title:
powerpc/64s: Add
Joseph,
Which branch did you use? I can't find the commits at master or master-
next:
[root@ltc-wspoon9 ubuntu-artful]# git log --oneline js-master | head -n 20
1e3dad9 UBUNTU: Ubuntu-4.13.0-12.13
1f46464 UBUNTU: [Config] CONFIG_I2C_XLP9XX=m
39ae1ca perf/x86: Fix data source decoding for Skylake
The source code for the kernel posted in comment #3 is the ubuntu-artful
repo with commits ccd3cd361 and 5080332c2c89 on top.
The artful repo is available at:
git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/artful
Both commits were clean picks and did not need back porting.
I
Joseph,
Do you have a kernel source for this package that I can take a deeper
look?
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Title:
powerpc/64s: Add workaround for P9 vector CI load
** Changed in: ubuntu-power-systems
Status: Triaged => In Progress
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Title:
powerpc/64s: Add workaround for P9 vector CI load issuenext
I built a 17.10(Artful) test kernel with a pick of commit 5080332c2c89.
It required commit ccd3cd361 as a prerequisite. The test kernel can be
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1721070/artful/
Can you test this kernel and see if it resolves this bug?
Also, is this patch
** No longer affects: linux (Ubuntu Zesty)
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Title:
powerpc/64s: Add workaround for P9 vector CI load issuenext
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** Changed in: ubuntu-power-systems
Status: New => Triaged
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Title:
powerpc/64s: Add workaround for P9 vector CI load issuenext
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** Changed in: linux (Ubuntu Zesty)
Importance: Medium => Critical
** Changed in: linux (Ubuntu Artful)
Importance: Medium => Critical
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** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Importance: Undecided => Critical
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Artful)
Importance: Medium
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: Triaged
** Also
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