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Starting in 3.15, arm64 began defaulting to non-coherent dma_ops:

commit c7a4a7658d689f664050c45493d79adf053f226e
Author: Ritesh Harjani <ritesh.harjani@xxxxxxxxx>
Date:   Wed Apr 23 06:29:46 2014 +0100

    arm64: Make default dma_ops to be noncoherent

Firmware (dtb in the case of the m400) is responsible for telling the
kernel when a device requires coherent dma_ops. However, as of utopic,
this property is not being inherited by downstream devices.
Specifically, the xgene-pcie device is marked as coherent, but the
devices behind it (mellanox card) still get initialized with non-
coherent ops.

This results in the mlx4 driver bailing out with the following messages:
[   18.703635] mlx4_core 0000:01:00.0: command 0x23 timed out (go bit not cleared)
[   18.710911] mlx4_core 0000:01:00.0: Failed to initialize queue pair table, aborting


There's an upstream discussion on the topic here:
  http://www.spinics.net/lists/arm-kernel/msg362320.html

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New

** Affects: debian-installer (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: Craig Magina (craig.magina)
         Status: Fix Released

** Affects: debian-installer (Ubuntu Utopic)
     Importance: High
         Status: Fix Released

** Affects: linux (Ubuntu Utopic)
     Importance: High
     Assignee: Ming Lei (tom-leiming)
         Status: Fix Released

** Affects: debian-installer (Ubuntu Vivid)
     Importance: High
         Status: Fix Released

** Affects: linux (Ubuntu Vivid)
     Importance: High
     Assignee: Craig Magina (craig.magina)
         Status: Fix Released


** Tags: arm-hs-vivid hs-arm64 kernel-da-key mcdivitt-fwd-comp utopic verification-done-utopic vivid
-- 
HP ProLiant m400 nic doesn't work after trusty
https://bugs.launchpad.net/bugs/1386490
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