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

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Message-ID: <CAHmME9qq5vSC+hZckCystU6cdRPihO492U2B2-pozbwg=3_5nw@mail.gmail.com>
Date:   Thu, 15 Sep 2016 22:52:34 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: TRIM/UNMAP/DISCARD via ATA Passthrough

Hi Martin,

On Thu, Sep 15, 2016 at 6:07 PM, Martin K. Petersen
> 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.

`sg_opcodes` said invalid request, so I think there isn't REPORT
SUPPORTED OPERATION CODES, and `sg_vpd -p ai` came up illegal too.

However, sg_sat_identify worked reliably, which means a solid way of
probing this would be to send IDENTIFY DEVICE ATA via SG_ATA_16 or
SG_ATA_12.

Let me know and I can give you access to the hardware if you're curious.

Regards,
Jason