Re: SATA link power management issues

Gabriele Mazzotta
2015-01-12T17:15:57Z

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