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== 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

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-142128 severity-high 
targetmilestone-inin16041
-- 
ISST-LTE:pVM nvme 0000:a0:00.0: iommu_alloc failed on NVMe card
https://bugs.launchpad.net/bugs/1633128
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