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[Bug 1632049] Re: PSL data cache should be flushed before resetting CAPI adapter

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1632049@xxxxxxxxxxxxxxxxxx>
Date: Wed, 09 Nov 2016 16:28:30 -0000
Reply-to: Bug 1632049 <1632049@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

This bug was fixed in the package linux - 4.4.0-47.68

---------------
linux (4.4.0-47.68) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1636941

  * Add a driver for Amazon Elastic Network Adapters (ENA) (LP: #1635721)
    - lib/bitmap.c: conversion routines to/from u32 array
    - net: ethtool: add new ETHTOOL_xLINKSETTINGS API
    - net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)
    - [config] enable CONFIG_ENA_ETHERNET=m (Amazon ENA driver)

  * unexpectedly large memory usage of mounted snaps (LP: #1636847)
    - [Config] switch squashfs to single threaded decode

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Wed, 26 Oct 2016 10:47:55 -0700

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

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1632049

Title:
  PSL data cache should be flushed before resetting CAPI adapter

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

Bug description:
  ---Problem Description---
  The PSL data cache should be flushed before resetting a CAPI adapter.
  If the PSL data cache holds dirty cache line when it is reset, the host trying to access that memory when the link is down may face a Uncorrectable Error (UE), forcing a reboot of the system.
   
  ---uname output---
  Linux freak 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:40:06 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  CAPI adapter needed + AFU image using the PSL cache (e.g. afu_directed memcpy) 

   
  Machine Type = Tuleta 
    
  ---Steps to Reproduce---
   There's some randomness to it, but triggering a memcpy test + card reset in a loop can produce it:

  memcpy_afu_ctx -p100 -l1000
  echo 1 > /sys/class/cxl/card0/reset
  Fix is already upstream under commit ID:
  aaa2245ed836824f21f8e42e0ab63b1637d1cb20 
  "cxl: Flush PSL cache before resetting the adapter"

  We would like the fix released for both 16.04 and 16.10 please.

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