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SubjectRe: [PATCH] libata: add human-readable error value decoding
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@nospamshaw.ca
Home Page: http://www.roberthancock.com/

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