Re: [PATCH] libata: add human-readable error value decoding

[Robert Hancock]

Tejun Heo wrote:
> > +    if (ehc->i.serror)
> > +        ata_port_printk(ap, KERN_ERR,
> > +          "SError: {%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
> > +          ehc->i.serror & SERR_DATA_RECOVERED ? "RecovDataErr " : "",
> > +          ehc->i.serror & SERR_COMM_RECOVERED ? "RecovCommErr " : "",
> > +          ehc->i.serror & SERR_DATA ? "UnrecovDataErr " : "",
> > +          ehc->i.serror & SERR_PERSISTENT ? "PersistErr " : "",
> > +          ehc->i.serror & SERR_PROTOCOL ? "ProtocolErr " : "",
> > +          ehc->i.serror & SERR_INTERNAL ? "HostInternalErr " : "",
> > +          ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
> > +          ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInternalErr " : "",
> > +          ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
> > +          ehc->i.serror & SERR_10B_8B_ERR ? "10B8BErr " : "",
> > +          ehc->i.serror & SERR_DISPARITY ? "Disparity " : "",
> > +          ehc->i.serror & SERR_CRC ? "CRCErr " : "",
> > +          ehc->i.serror & SERR_HANDSHAKE ? "HandshakeErr " : "",
> > +          ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeqErr " : "",
> > +          ehc->i.serror & SERR_TRANS_ST_ERROR ? "TransStatTransErr " : "",
> > +          ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecogFIS " : "",
> > +          ehc->i.serror & SERR_DEV_XCHG ? "DevExchanged " : "" );
>
> I'm not really convinced whether this is necessary.  The human readable
> form is also a bit cryptic and can get quite long.  So, mild NACK from me.

It certainly seems useful when debugging hotplug issues or random SATA 
problems which end up being caused by communication problems. Without 
this output, Joe User stands no chance of figuring out what's going on, 
and neither does Joe libata Developer unless they really care to dig 
through the spec and count bits to figure out what they mean. At least 
with this you can see that there was a CRC error, etc. and go from that..

--
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/