From mboxrd@z Thu Jan  1 00:00:00 1970
From: keith.busch@intel.com (Keith Busch)
Date: Tue, 23 Aug 2016 10:46:53 -0400
Subject: NVMe pci driver unable to create queues
In-Reply-To: <20160823092641.hczs3ya7niztlwxl@c203.arch.suse.de>
References: <20160823092641.hczs3ya7niztlwxl@c203.arch.suse.de>
Message-ID: <20160823144652.GG28276@localhost.localdomain>

On Tue, Aug 23, 2016@11:26:41AM +0200, Johannes Thumshirn wrote:
> Hi,
> 
> I have the follwing errors on a ARM 64 device:
> 
> $ dmesg  | grep nvme
> [   14.490744] nvme nvme0: pci function 0005:90:00.0
> [   15.913973] nvme 0005:90:00.0: Could not set queue count (6)
> [   15.913986] nvme nvme0: IO queues not created
> 
> but cannot really debug why the driver isn't able to create it's IO
> queues.
> 
> Has anybody seen a similar error? All I've found was
> https://lkml.org/lkml/2016/4/26/1557 and that wasn't really helpfull.

The return code "6" means "internal device error" and indicates the
device is in a bad state incapable of IO.

The driver should have provided a character device handle at /dev/nvme0
that you can issue admin commands to query and potentially fix the
device. You may need to check with the device vendor for those steps.