Public bug reported:

[Impact]
Administrators are not able to request an FLR reset via sysfs on v3 hisi_sas 
controllers.

[Test Case]
dmesg -c > /dev/null
echo 1 > /sys/devices/pci0000:74/0000:74:02.0/reset
dmesg

Expected output:
[259487.660676] hisi_sas_v3_hw 0000:74:02.0: FLR prepare
[259489.602044] hisi_sas_v3_hw 0000:74:02.0: FLR done

[Fix]
commit e5ea48014adcb030b9d92743e87fbbcbbb2a1d70
Author: Xiaofei Tan <tanxiao...@huawei.com>
Date:   Wed Jul 18 22:14:30 2018 +0800

    scsi: hisi_sas: Implement handlers of PCIe FLR for v3 hw

[Regression Risk]
The fix itself has a low regression risk because it implements a 
previously-unsupported feature. However, there are 2 changesets that refactor 
reset code ahead that are required before the above fix, and that refactoring 
has a risk of introducing a regression.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: In Progress

** Affects: linux (Ubuntu Bionic)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: In Progress

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

** Changed in: linux (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => dann frazier (dannf)

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https://bugs.launchpad.net/bugs/1794166

Title:
  Add functional level reset support for the SAS controller on HiSilicon
  D06 systems

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  [Impact]
  Administrators are not able to request an FLR reset via sysfs on v3 hisi_sas 
controllers.

  [Test Case]
  dmesg -c > /dev/null
  echo 1 > /sys/devices/pci0000:74/0000:74:02.0/reset
  dmesg

  Expected output:
  [259487.660676] hisi_sas_v3_hw 0000:74:02.0: FLR prepare
  [259489.602044] hisi_sas_v3_hw 0000:74:02.0: FLR done

  [Fix]
  commit e5ea48014adcb030b9d92743e87fbbcbbb2a1d70
  Author: Xiaofei Tan <tanxiao...@huawei.com>
  Date:   Wed Jul 18 22:14:30 2018 +0800

      scsi: hisi_sas: Implement handlers of PCIe FLR for v3 hw

  [Regression Risk]
  The fix itself has a low regression risk because it implements a 
previously-unsupported feature. However, there are 2 changesets that refactor 
reset code ahead that are required before the above fix, and that refactoring 
has a risk of introducing a regression.

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