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From: Douglas Gilbert <dgilbert@interlog.com>
To: Artur Wojcik <artur.wojcik@intel.com>
Cc: James.Bottomley@HansenPartnership.com, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] libsas: add SMP READ/WRTIE GPIO support
Date: Wed, 01 Jun 2011 10:32:24 -0400	[thread overview]
Message-ID: <4DE64D78.6090309@interlog.com> (raw)
In-Reply-To: <20110601140203.26324.22849.stgit@gklab-128-184.igk.intel.com>

On 11-06-01 10:02 AM, Artur Wojcik wrote:
> This patch enables the SMP READ/WRITE GPIO function interface in libsas SMP
> host module. The interface is used to control the SGPIO initiator in the SAS
> initiator. The implementation is SFF-8485 and SAS-2 compliant.
>
> There are two functions in transport class only responsible for reading and
> writting GPIO registers. I decided to leave the decission about what type of
> registers are supported to lldd.
>
> Now the user space application may issue SMP READ/WRITE GPIO frame to HBA in
> order to read/write GPIO registers.

Your code also accepts the somewhat mysterious READ GPIO
REGISTER ENHANCED SMP function and its WRITE equivalent.
Reference is made in sas2r16.pdf to SFF-8485 for those
functions. However the most recent version of SFF-8485
on the Seagate site is 0.7 dated February 2006, and it does
not define those ENHANCED functions.

Could you tell us what those ENHANCED versions do?

Doug Gilbert

  reply	other threads:[~2011-06-01 14:32 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-01 14:02 [PATCH] libsas: add SMP READ/WRTIE GPIO support Artur Wojcik
2011-06-01 14:32 ` Douglas Gilbert [this message]
2011-06-01 17:02   ` Artur Wojcik
2011-08-03 20:02     ` James Bottomley
2011-08-03 20:53       ` James Bottomley
2011-06-22 18:27 ` Dan Williams

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