Public bug reported:
Starting in 3.15, arm64 began defaulting to non-coherent dma_ops:
commit c7a4a7658d689f664050c45493d79adf053f226e
Author: Ritesh Harjani <ritesh.harj...@gmail.com>
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: linux (Ubuntu)
Importance: High
Status: Confirmed
** Affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Vivid)
Importance: High
Status: Confirmed
** Tags: hs-arm64
** Attachment added: "boot log demonstrating problem"
https://bugs.launchpad.net/bugs/1386490/+attachment/4246707/+files/boot.log
** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Vivid)
Importance: High
Status: Confirmed
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https://bugs.launchpad.net/bugs/1386490
Title:
HP ProLiant m400 nic doesn't work after trusty
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