------- Comment From mauri...@br.ibm.com 2016-11-29 17:04 EDT-------
Hi Canonical
(@hendrix @timg-tpi)
Attaching proper backports of the 3 patches [1] for 16.04.x.
Built and verified on top of ubuntu-xenial.git master-next -- currently,
52.73 at 44b1707bf297 ("kvm/irqchip: kvm_arch_irq_routing_update
renaming split").
This is the test-case.
A bunch of 64k writes to partitions on NVMe drive, simultaneously.
No messages are printed to dmesg.
Linux ubuntu 4.4.0-52-generic #73+bz142128v1 SMP Tue Nov 29 13:06:49 CST
2016 ppc64le ppc64le ppc64le GNU/Linux
root@ubuntu:~# dmesg -c >/dev/null; for p in 2 {5..11}; do echo $p; dd
if=/dev/zero of=/dev/nvme0n1p$p bs=64k count=128k & done; wait; echo dmesg
begin; dmesg; echo dmesg end
<...>
[1] Done dd if=/dev/zero of=/dev/nvme0n1p$p bs=64k
count=128k
<...>
[8]+ Done dd if=/dev/zero of=/dev/nvme0n1p$p bs=64k
count=128k
dmesg begin
dmesg end
[1]
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=DMA_ATTR_NO_WARN
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https://bugs.launchpad.net/bugs/1633128
Title:
ISST-LTE:pVM nvme 0000:a0:00.0: iommu_alloc failed on NVMe card
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Yakkety:
Fix Committed
Bug description:
== Comment: #0 - Chanh H. Nguyen <chngu...@us.ibm.com> - 2016-06-02 14:22:00
==
There are a huge iommu_alloc failure on the dmesg log during our ST run on
the nvme card.
root@br502lp2:~# uname -r
4.4.0-22-generic
root@br502lp2:~# free -g
total used free shared buff/cache
available
Mem: 376 1 101 0 273
373
Swap: 10 0 10
root@br502lp2:~# dmesg |grep "iommu_alloc"
[ 844.572656] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000001c1a70000 npages 16
[ 844.572658] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000000c3510000 npages 16
[ 844.572664] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000023c0260000 npages 16
[ 844.572694] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000000c35b0000 npages 16
[ 844.572700] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000001c1a70000 npages 16
[ 844.572703] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000023c7a90000 npages 16
[ 844.572718] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000000c35b0000 npages 16
[ 844.572727] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000001c1a70000 npages 16
[ 844.572730] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000023c7a90000 npages 16
[ 844.572746] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c0000023c7a90000 npages 16
[ 1033.500635] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c000002a64500000 npages 16
[ 1033.500894] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c000002a64500000 npages 16
[ 1033.501290] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c000003b80d10000 npages 16
[ 1033.501337] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
vaddr c000002903910000 npages 16
[ 1033.501590] nvme 0001:01:00.0: iommu_alloc failed, tbl c00000466a2bfc00
root@br502lp2:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinux-4.4.0-22-generic
root=UUID=2852021a-6954-42a9-8c69-7a58ccfbb65d ro xmon=on disable_ddw splash
quiet crashkernel=384M-:128M
root@br502lp2:~# lsmcode
Version of System Firmware is FW840.20 (SC840_100) (t) FW840.10 (SC840_079)
(p) FW840.20 (SC840_100) (b)
Version of PFW is 14492016042881CF0681
== Comment: #4 - Mauricio Faria De Oliveira <mauri...@br.ibm.com> -
2016-10-13 10:16:40 ==
Hi Canonical,
This patch series that resolves this problem made linux mainline in the 4.9
merge window:
("dma-mapping, powerpc, nvme: introduce the DMA_ATTR_NO_WARN attribute")
Can you please apply it on 16.04.x?
Thanks!
Links/commits
---
[1] "dma-mapping: introduce the DMA_ATTR_NO_WARN attribute"
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a9a62c9384417545620aee1b5ad1d9357350c17a
[2] "powerpc: implement the DMA_ATTR_NO_WARN attribute"
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=af8a24988e48f9ed20acf4d5230ac216d5baf723
[3] "nvme: use the DMA_ATTR_NO_WARN attribute"
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b6b535d9158b822a45080b3d6d5b2993fd49e5a
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