Re: [PATCH 2/6] libata: Report supported TRIM payload size

[Mark Lord <kernel@teksavvy.com>]

On 10-08-20 04:58 AM, Christoph Hellwig wrote:
> On Thu, Aug 19, 2010 at 05:50:11PM -0400, Mark Lord wrote:
>> On 10-08-19 02:05 PM, Martin K. Petersen wrote:
>>> I'm only aware of one drive that currently
>>> supports more than 512 bytes of payload and it also caps at 4KB.
>>
>> SSDs based upon the Indilinx Barefoot controller support
>> more or less "infinite" payload for TRIM, with no cap.
>> But it predates idword[105], so just has a zero there.
>
> Is there an easy way to identify them?  If so we could add a quirk
> for them if it provides enough benefit.


Each brand/model identifies itself differently.
But we could start a whitelist on based on the model name field
from the ATA identify data.

The OCZ VERTEX drives I have here, identify themselves as "OCZ-VERTEX",
and accept very very long payloads (no limit?).

The OCZ VERTEX-LE drives here do have a limit, of 8 sectors,
and identify themselves as "OCZ VERTEX-LE" in that field.

That's what hdparm-9.30 uses to figure out the max TRIM payloads,
in the absence of a value in word 105.

Cheers