[dm-devel] AMD-Vi IO_PAGE_FAULTs and ata3.00: failed command: READ FPDMA QUEUED errors since Linux 4.0

[Mike Snitzer]

On Tue, Jul 28 2015 at  2:20pm -0400,
Andreas Hartmann <andihartmann at freenet.de> wrote:

> On 07/28/2015 at 07:50 PM, Mike Snitzer wrote:
> [..]
> > Are your SATA devcies using NCQ?
> 
> Yes. It's enabled:
> 
> dmesg| grep -i ncq
> ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part
> ata2.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
> ata3.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
> ata1.00: 468862128 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
> 
> As the errors already come up on boot (during mount of partitions or
> even before the password for the disk has been provided): How can I
> disable NCQ during boot of the kernel? Is there a kernel option?

See:
https://ata.wiki.kernel.org/index.php/Libata_FAQ#Enabling.2C_disabling_and_checking_NCQ

alternatively, and likely easier, set this on the kernel commandline:
 libata.force=noncq
 
> I'm trying to apply your mentioned patches to 3.19 and report back.

OK.