linux-kernel - Re: TRIM/UNMAP/DISCARD via ATA Passthrough

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Message-ID: <yq1twdhb0zr.fsf@sermon.lab.mkp.net>
Date:   Thu, 15 Sep 2016 12:07:20 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: TRIM/UNMAP/DISCARD via ATA Passthrough

>>>>> "Jason" == Jason A Donenfeld <Jason@...c4.com> writes:

Jason,

>> How do they signal that they support the passthrough?

Jason> Through the usual SCSI ATA-passthrough interface, "SAT" (SCSI-ATA
Jason> Command Translation) -- ATA PASS THROUGH SCSI (16) and ATA PASS
Jason> THROUGH SCSI (12).

But how do they signal that ATA passthrough is possible? Is there an ATA
Information VPD page? Is REPORT SUPPORTED OPERATION CODES supported?

We need really solid discovery data before we can entertain enabling
something like this.

-- 
Martin K. Petersen	Oracle Linux Engineering