linux-kernel - Re: SATA link power management issues

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Message-ID: <1606112.gp6iaYBghU@xps13>
Date:	Mon, 12 Jan 2015 18:15:52 +0100
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: SATA link power management issues

On Monday 12 January 2015 12:07:34 Tejun Heo wrote:
> Hello, Gabriele.
> 
> On Mon, Jan 12, 2015 at 06:03:41PM +0100, Gabriele Mazzotta wrote:
> > I tried it and got the same result:
> > 
> > [  451.077463] ahci 0000:00:1f.2: port does not support device sleep
> > [  452.162451] ata3.00: exception Emask 0x10 SAct 0x400 SErr 0x50000 action 0xe frozen
> > [  452.162461] ata3.00: irq_stat 0x00400008, PHY RDY changed
> > [  452.162467] ata3: SError: { PHYRdyChg CommWake }
> > [  452.162473] ata3.00: failed command: WRITE FPDMA QUEUED
> > [  452.162484] ata3.00: cmd 61/58:50:98:7c:4b/00:00:17:00:00/40 tag 10 ncq 45056 out
> >          res 40/00:54:98:7c:4b/00:00:17:00:00/40 Emask 0x10 (ATA bus error)
> > [  452.162489] ata3.00: status: { DRDY }
> > [  452.162497] ata3: hard resetting link
> > [  452.886958] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> > [  452.890384] ata3.00: configured for UDMA/133
> > [  452.902976] ahci 0000:00:1f.2: port does not support device sleep
> > [  452.903002] ata3: EH complete
> 
> Hah, that's weird.  Can you please double check that you're actually
> running the patched kernel by throwing in a printk around the
> commented out section?  If leaving phy irqs turned off doesn't make
> the problem go away, I'm not sure there's much we can do.  Hmmm... one
> option could be holding off speed-down verdict after LPM state
> transition, but it looks like the ssd in question is misbehaving
> pretty badly.
> 
> Thanks.

Done:

[  168.515793] ahci 0000:00:1f.2: port does not support device sleep
[  168.515800] Skip turn PHYRDY IRQ back on
[  168.515802] turn PHYRDY IRQ back on skipped
[  168.523793] ata3.00: exception Emask 0x10 SAct 0x40 SErr 0x50000 action 0xe frozen
[  168.523798] ata3.00: irq_stat 0x00400008, PHY RDY changed
[  168.523801] ata3: SError: { PHYRdyChg CommWake }
[  168.523805] ata3.00: failed command: WRITE FPDMA QUEUED
[  168.523811] ata3.00: cmd 61/28:30:68:60:4b/00:00:17:00:00/40 tag 6 ncq 20480 out
         res 40/00:34:68:60:4b/00:00:17:00:00/40 Emask 0x10 (ATA bus error)
[  168.523814] ata3.00: status: { DRDY }
[  168.523819] ata3: hard resetting link
[  169.248384] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  169.251661] ata3.00: configured for UDMA/133
[  169.264293] ahci 0000:00:1f.2: port does not support device sleep
[  169.264299] Skip turn PHYRDY IRQ back on
[  169.264301] turn PHYRDY IRQ back on skipped
[  169.264315] ata3: EH complete
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