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[Bug 1548413] Re: bug from upstream commit changes behavior of PCI DMA on PowerNV/bare-metal platforms and can result in EEH when adapter tries to read back buffer after DMA write

 

This patch came in with v4.4.3 stable. Marking Fix Released as it will
soon appear in linux 4.4.0-9

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Fix Committed

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1548413

Title:
  bug from upstream commit changes behavior of PCI DMA on PowerNV/bare-
  metal platforms and can result in EEH when adapter tries to read back
  buffer after DMA write

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  == Comment: #0 - Douglas Miller - 2016-01-12 14:28:48 ==
  ---Problem Description---
  bug from upstream commit 10b35b2b7485c342334a48cf199063eed8b8748e changes behavior of PCI DMA on PowerNV/bare-metal platforms and can result in EEH when adapter tries to read back buffer after DMA write.
   
  ---uname output---
  Affects Wily and Xenial kernel streams. Based on code inspection, not observation in running kernel
   
  Machine Type = 8348 "Habanero LC" 
   
  ---Steps to Reproduce---
  Setup RAID volume on PMC-Sierra adapter (driver aacraid) and start a test/exerciser doing disk reads on the volume. Pull a disk from the volume and an EEH should result.
   
  == Comment: #1 - Douglas Miller - 2016-01-12 14:29:51 ==
  Fix is being reviewed and should get pushed upstream soon. Suggest pulling that fix as soon as it is available. Patch is being reviewed on linuxppc-dev mailing list, titled "powerpc/ioda: Set "read" permission when "write" is set".

  == Comment: #4 - Douglas Miller  - 2016-02-22 08:08:43 ==

  The fix has been accepted and is now in "master" on linux.git.

  commit 6ecad912a0073c768db1491c27ca55ad2d0ee68f

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